JP2017137926A - Mobile hydrogen station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile hydrogen station which can charge hydrogen gas into a hydrogen gas use installation, permits miniaturization and energy-saving and can be moved.SOLUTION: A hydrogen gas charging device according to a differential pressure charging method which supplies hydrogen gas to a hydrogen gas use installation with a predetermined pressure includes: a hydrogen gas accumulator which accumulates hydrogen gas in a compressed state; a gas storage unit which charges hydrogen gas to the hydrogen gas accumulator; and a dispenser which quantitatively ejects hydrogen gas accumulated in the hydrogen accumulator and charges the hydrogen gas to the hydrogen gas use installation. The hydrogen gas accumulator, the gas storage unit and the dispenser are mounted on a base stand part of a trailer capable of traction by means of a tractor. The dispenser can be moved, may be freely separated and detached from the base stand part of the trailer and may be fixed to the base stand part of the trailer. On a housing for covering the base stand part of the trailer, an air hole for ventilation and a main valve operation door are provided.SELECTED DRAWING: Figure 3

Description

  TECHNICAL FIELD The present invention relates to a hydrogen gas filling system that supplies high-purity hydrogen to a hydrogen gas use facility at a predetermined pressure, and in particular, the use of hydrogen gas of high-pressure hydrogen gas such as a small mobile body such as a fuel cell vehicle or a fuel cell forklift. The present invention relates to a mobile hydrogen station that supplies high-pressure hydrogen gas to equipment.

In recent years, fuel cell vehicles using hydrogen have been rapidly put into practical use as a clean energy source for improving the self-sufficiency of energy and improving the environment. For the spread of fuel cell vehicles, it is indispensable to develop a hydrogen station as a hydrogen supply infrastructure.
However, before hydrogen stations become widespread, small-scale filling facilities and emergency filling facilities in the event of hydrogen gas shortage are essential. At that time, the installation location of the filling equipment having a sufficient safety distance is very limited, and when a small hydrogen station is designed by the conventional design concept, the equipment cost is expected to be high.

In the case of a conventional hydrogen station, a compressor (compressor) is used to pre-fill the accumulator with high-pressure hydrogen gas, and the fuel cell vehicle is filled with hydrogen gas from the accumulator (see, for example, Patent Document 1). ).
Usually, many accumulators used in conventional hydrogen stations are required to store hydrogen gas at a high pressure. Moreover, in the conventional hydrogen station, the compressor which compresses hydrogen gas is needed. Furthermore, when the fuel cell vehicle is filled with high-pressure hydrogen gas, if it is directly supplied to the fuel tank, it becomes difficult to set the temperature of the high-pressure gas to a safety reference temperature of 80 ° C. or lower. Since cooling is necessary in advance and a cooling facility (precooler) is provided for that purpose, an increase in the size of the hydrogen gas filling device is inevitable. However, there are severe restrictions on the installation location in the hydrogen station or various processes, and the enlargement of the hydrogen gas filling apparatus under such conditions is a major issue.
Furthermore, in recent years, the necessity of supplying hydrogen gas at various places has been increasing, and the existence of a movable hydrogen station has been demanded.

JP 2006-138332 A

  In view of the above situation, the present invention provides a mobile hydrogen station that can be filled with hydrogen gas in equipment using hydrogen gas with a relatively simple configuration, and that achieves downsizing and energy saving. Objective.

In order to solve the above-mentioned problems, the mobile hydrogen station of the present invention is a hydrogen gas filling device by a differential pressure filling method for supplying hydrogen gas to a facility using hydrogen gas at a predetermined pressure, in a state where the hydrogen gas is compressed. It consists of a hydrogen gas pressure accumulator that stores, a gas accumulator unit that fills the hydrogen gas pressure accumulator with hydrogen gas, and a dispenser that quantitatively discharges the hydrogen gas stored in the hydrogen gas pressure accumulator to fill the hydrogen gas using equipment, The hydrogen gas pressure accumulator, the gas accumulator unit, and the dispenser are mounted on a trailer that can be pulled by a towing vehicle, and the dispenser is configured to be removable from the trailer.
It is a compact configuration composed of a hydrogen gas pressure accumulator, a gas accumulator unit, and a dispenser, and can be easily moved by mounting these devices on a trailer pulled by another towing vehicle. Further, since the dispenser has a structure that can be detached from the trailer, the trailer can be moved by removing the dispenser.

Further, in the mobile hydrogen station of the present invention, the trailer has a housing that covers the pedestal portion, and the housing has a main valve operation for manually opening and closing the ventilation vent and the main valve of the hydrogen gas pressure accumulator. A door is provided, and the main valve operation door is preferably provided at a position where the main valve can be manually opened and closed in a state where the housing is installed on the pedestal. By providing the ventilation hole, it is possible to prevent the housing from being filled with hydrogen gas in the event of a gas leak or the like. In addition, since the main valve of the hydrogen gas pressure accumulator can be opened and closed in a state where the housing is installed on the pedestal, the convenience during use of the hydrogen gas pressure accumulator is enhanced.
A gas sensor may be provided in the housing, and the ventilation hole may be opened and closed automatically by a signal from the gas sensor.

When the fuel cell unit is further mounted on the pedestal portion in the mobile hydrogen station of the present invention and the residual hydrogen gas pressure of the hydrogen gas accumulator reaches a low pressure below a predetermined threshold, the residual hydrogen gas is transferred to the fuel cell unit. The supplied fuel cell unit may be used as an emergency power source or a power saving power source for the hydrogen gas filling device.
Conventionally, when the pressure of the hydrogen gas remaining in the hydrogen gas cylinder becomes a low pressure state of about 0.05 to 1 MPa, it is recovered as an unnecessary gas cylinder. However, even low-pressure hydrogen gas of about 0.05 to 1 MPa can be used for hydrogen gas supplied to the fuel cell unit. Therefore, the residual hydrogen gas is used as a gas cylinder for supplying the residual hydrogen gas to the fuel cell unit without recovering the low-pressure gas cylinder whose pressure is about 0.05 to 1 MPa, and the residual low-pressure (0.05 to 1 MPa) is used. Hydrogen gas is used for the fuel cell unit. Then, by using the fuel cell unit as an emergency power source or a power saving power source for the hydrogen gas filling device, energy saving of the hydrogen gas filling device is realized.

  Further, the pedestal portion is further provided with a compressor, the compressor is movable and can be separated and removed from the pedestal portion of the trailer, or the compressor is fixed to the pedestal portion of the trailer, and the compressor is The gas accumulator may be compressed and filled with hydrogen gas. When the pressure of the hydrogen gas accumulator decreases, it becomes difficult to fill the hydrogen gas by the differential pressure filling method. Therefore, even if the pressure decreases, the differential pressure filling can be continuously performed by compressing and filling the hydrogen gas from the hydrogen gas cylinder to the hydrogen gas accumulator using the compressor.

The dispenser in the mobile hydrogen station of the present invention has no piping in the main system from the hydrogen gas input port to the hydrogen gas output port, and is composed of only joints, or the piping remains in a part of the main system. In the configuration, the number of pipes is preferably 20% or less of the total number of joints.
As a result, downsizing can be realized and mounting on a trailer can be facilitated. Although it is preferable that the main system has no piping and only the joint is used, the piping may remain in a part of the main system. However, in order to make the dispenser compact, the number of pipes should be as small as possible. Even if the pipe remains in a part of the main system, the number of pipes is 20% or less of the total number of joints, that is, the number of joints. If the number is 10, use 1 or 2 pipes.

  Here, the joint refers to a component that connects two mechanical parts. Conventionally, a pipe through which hydrogen gas flows and a pipe joint that connects these pipes have been often used. In the present invention, in order to make the dispenser compact, pipes are eliminated as much as possible, or only a part of the pipes are used, and instead of pipe joints, valves and valves, valves and gauges, gauges and orifices are directly connected. We decided to use joint parts. As the structure of this joint part, that is, the structure of the joint part that connects the first valve and the like to the second valve and the like, for example, the first joint that connects the first valve and the like, and the second that connects the second valve and the like Examples include a joint, a clamp member that covers and joins the butted portions of the first joint and the second joint, and a bolt and a nut that tighten the clamp member.

The hydrogen gas pressure accumulator in the mobile hydrogen station of the present invention includes a cooling means for cooling the hydrogen gas accumulated in the pressure accumulator, and functions as a precooler of a hydrogen gas filling device by a differential pressure filling method. preferable.
According to the said structure, size reduction can be achieved rather than installing a precooler separately, and the mounting to a trailer is made easy.

The hydrogen gas pressure accumulator in the mobile hydrogen station of the present invention calculates the flow rate and amount of hydrogen gas to be filled in the facility using hydrogen gas by measuring the pressure and temperature of the hydrogen gas in the pressure accumulator. It is preferable.
According to this, since the filling amount can be measured without using an expensive flow meter such as the Coriolis method, it is possible to contribute to the cost reduction of the entire apparatus. Pressure gauges and thermometers are equipped with connectors that can measure the temperature and pressure in the accumulator to measure pressure and temperature more accurately. This connector may or may not have an on-off valve. Alternatively, a pressure gauge may be installed near the outlet of the accumulator to measure the pressure of hydrogen gas, and a thermometer may be installed on the outer surface of the accumulator to measure the temperature of the accumulator. Alternatively, both of the above-described methods may be performed, and a pressure gauge and a thermometer may be installed. And based on a measurement result, the flow volume and filling amount of the hydrogen gas with which hydrogen gas using equipment is filled are calculated.
When there are a plurality of pressure accumulators, the pressure and temperature of the hydrogen gas in each pressure accumulator can be measured, and the measured filling amounts can be added together.

  The final filling amount of the accumulator is calculated from the difference in weight calculated from the pressure and temperature before filling and the pressure and temperature after filling. At that time, the internal temperature is monitored until the temperature in the pressure accumulator after filling is stabilized. Usually, after waiting for about 5 to 60 seconds, calculation is performed based on a stable temperature. Furthermore, when a more accurate filling amount is required, in order to correct the calculation error due to residual hydrogen between the accumulator and the flow control valve, correction is made using numerical values calculated from the capacity, residual pressure and temperature of that part. To calculate a more accurate filling amount.

  The calculated flow rate information is used to select a plurality of orifices installed for controlling the flow rate of hydrogen gas filled in the hydrogen gas use facility or to control a flow rate control valve used in place of the orifices. It is also used for calculating the filling amount of equipment using hydrogen gas.

  The hydrogen gas pressure accumulator in the mobile hydrogen station of the present invention has a built-in hydrogen storage alloy, and pressurizes the hydrogen storage alloy by heating the hydrogen storage alloy and releasing the hydrogen gas stored in the hydrogen storage alloy to increase the hydrogen gas pressure. Means and pressure reducing means for cooling the hydrogen storage alloy to promote hydrogen gas storage and reduce the hydrogen gas pressure may be provided.

According to the above configuration, high-purity hydrogen gas can be safely filled in hydrogen gas-using equipment with a relatively simple configuration, and can be reduced in size, saved in energy, and silenced, and easily mounted on trailers. To.
Since the pressure accumulator on the hydrogen gas filling device side incorporates a hydrogen storage alloy, the hydrogen storage alloy is allowed to adsorb hydrogen gas, and then cooled to release and remove unadsorbed impurities to remove the hydrogen gas. By purifying and heating the hydrogen-absorbing hydrogen-absorbing alloy, hydrogen gas can be released to increase the hydrogen gas pressure in the pressure accumulator. That is, high pressure hydrogen gas can be filled in the accumulator without using a compressor. Thereafter, the hydrogen gas use facility is filled with the high-pressure hydrogen gas in the accumulator.

  A heating unit and a cooling unit are provided around the accumulator. A heating means heats the circumference | surroundings of a pressure accumulator and heats the hydrogen storage alloy incorporated in the pressure accumulator. Then, the hydrogen gas stored in the hydrogen storage alloy is released, and the hydrogen gas pressure in the pressure accumulator is increased. The heating means functions as a pressurizing means for hydrogen gas in the pressure accumulator. On the other hand, a cooling means cools the circumference | surroundings of a pressure accumulator and cools the hydrogen storage alloy incorporated in the pressure accumulator. And hydrogen gas occlusion is promoted with respect to a hydrogen storage alloy, and the hydrogen gas pressure in an accumulator is reduced. The cooling means functions as a pressure reducing means for hydrogen gas in the pressure accumulator. The heating means and the cooling means may be integrated and may be a heating and cooling means.

  Further, the heating means may use exhaust heat from the hydrogen gas use facility. The cooling means may use natural air cooling by outside air when the apparatus is installed in a cold region. Since the required pressure and supply speed of the hydrogen gas differ depending on the hydrogen gas use facility, a means capable of temperature control that satisfies these requirements is selected.

  Here, the hydrogen storage alloys include the already known magnesium-based alloys and vanadium-based alloys, base alloys of transition elements such as titanium, manganese, zirconium and nickel, transition elements having a catalytic effect on rare earth elements, niobium and zirconium. An alloy containing (nickel, cobalt, aluminum, etc.), a base alloy of a titanium-iron intermetallic compound, or the like can be used.

  In the mobile hydrogen station of the present invention, it is preferable that the flow rate control means for controlling the amount of hydrogen supplied to the facility using hydrogen gas is a throttle mechanism for a circular pipe using an orifice. In addition, it is preferable to provide orifices of different diameters in parallel so that hydrogen gas can be supplied from a pressure accumulator with different filling pressures to the facility using hydrogen gas. By using an orifice as a flow rate control means for controlling the amount of hydrogen, the equipment becomes simple and the flow rate of hydrogen gas can be easily controlled.

The dispenser in the mobile hydrogen station of the present invention includes a small control nitrogen supply container that supplies nitrogen used for control equipment in the dispenser. Control nitrogen supply container of this small (N ₂ header) is a nitrogen cylinder provided to the dispenser outside, if the regular or nitrogen pressure nitrogen from the nitrogen gas cylinder of large capacity lower than control nitrogen supply vessel Can be filled.
By providing the N ₂ header in the dispenser, the dispenser can be miniaturized. The N ₂ header supplies nitrogen used for control devices (such as air-operated valves) in the dispenser. By periodically filling nitrogen from a nitrogen cylinder outside the dispenser, the dispenser can be filled with a nitrogen cylinder or the like. It is not necessary to secure space, and the dispenser can be downsized. The N ₂ header is provided with a quick coupler for easily filling with nitrogen, so that it can be quickly filled with nitrogen when the nitrogen pressure is lowered.
Nitrogen used for the N ₂ header can be replaced with an inert gas such as argon or helium in addition to nitrogen. Further, when it is used not only for control but only for instrumentation, air can be substituted.

  The gas storage unit in the mobile hydrogen station of the present invention is preferably provided with a gas vent connector for extracting gas from the hydrogen gas using facility. For example, when the hydrogen gas use facility is a fuel cell vehicle (FCV), it is necessary to extract hydrogen gas from the vehicle at the time of vehicle inspection registration. Therefore, a gas vent connector is provided in the gas accumulator unit so that the hydrogen gas can be extracted from the hydrogen gas use facility as required.

  Between the hydrogen gas accumulator and the dispenser in the mobile hydrogen station of the present invention, an adiabatic expansion chamber for adiabatic expansion of hydrogen gas is provided, and the hydrogen gas accumulated in the hydrogen gas accumulator is adiabatic expansion chamber The hydrogen gas expands and the average intermolecular distance increases, and the average kinetic energy of the molecule decreases and the temperature of the hydrogen gas decreases by increasing the potential energy caused by van der Waals attraction. It is preferable to make it. By providing a chamber for adiabatic expansion, when hydrogen gas is sent from the hydrogen gas pressure accumulator to the dispenser, the hydrogen gas can be cooled in advance, and the temperature rises rapidly when filling the hydrogen gas using equipment. An adiabatic expansion chamber can be used as a precooler for suppression.

When the hydrogen gas output from the dispenser in the mobile hydrogen station of the present invention is filled in the hydrogen gas use facility, an indicator for displaying the flow of the hydrogen gas is provided, and the indicator moves in a direction crossing the flow path of the hydrogen gas. It is a piston arranged in a possible state.
The piston according to the first aspect includes a first pressure receiving end surface that receives a first pressure from the hydrogen gas filling device side in a direction traversing the flow path, and a second from the side of the hydrogen gas using facility in a direction traversing the flow path. A second pressure-receiving end face that receives the pressure of the first pressure. In the piston of the first aspect, the area of the first pressure receiving end face is smaller than the area of the second pressure receiving end face, and a through hole is provided from the first pressure receiving end face to the second pressure receiving end face.

The piston is disposed so that the first pressure receiving end face is on the hydrogen gas filling device side and the second pressure receiving end face is on the hydrogen gas using facility side.
During filling, the piston moves to the hydrogen gas using equipment side due to the pressure difference between the hydrogen gas filling device side on the high pressure side and the hydrogen gas using equipment side on the low pressure side. On the other hand, when the filling is completed, the hydrogen gas filling device side and the hydrogen gas using equipment side have the same pressure, and the piston moves to the hydrogen gas filling device side. As a result, the externally visible display changes.

This utilizes a pressure difference between the high-pressure side (hydrogen station side) and the low-pressure side (hydrogen-using facility) during filling so that the piston serving as an indicator operates mechanically and automatically.
By providing such an indicator, it is possible to visualize whether hydrogen gas is being filled or has been filled when hydrogen gas is charged from a hydrogen station to a hydrogen-using facility such as FCV. it can. In addition, since it is a compact device, it contributes to the compactness of mobile hydrogen stations. The above configuration is particularly effective when an orifice is used.
The indicator may be any indicator as long as the display visible from the outside changes. For example, the indicator may be one in which a display line is visible or hidden or a display window is provided.

In addition, an indicator for displaying the flow of the hydrogen gas when the hydrogen gas output from the dispenser in the mobile hydrogen station according to the present invention is filled in the hydrogen gas use facility is provided, and the indicator extends in the direction crossing the hydrogen gas flow path. It is the piston arrange | positioned in the state which can be moved to.
The piston according to the second aspect includes a first pressure receiving end surface that receives a first pressure from the hydrogen gas filling device side in a direction traversing the flow path, and a second from the side of the hydrogen gas using facility in a direction traversing the flow path. A second pressure-receiving end face that receives the pressure of the first pressure. In the piston of the second aspect, the area of the first pressure receiving end face is equal to the area of the second pressure receiving end face, and a through hole is provided from the first pressure receiving end face to the second pressure receiving end face.

The first pressure receiving end face is disposed on the hydrogen gas filling device side, and the second pressure receiving end face is disposed on the hydrogen gas using facility side.
During filling, the piston moves to the hydrogen gas using equipment side due to the pressure difference between the hydrogen gas filling device side on the high pressure side and the hydrogen gas using equipment side on the low pressure side. On the other hand, when the filling is completed, the hydrogen gas filling device side and the hydrogen gas using equipment side have the same pressure, and the piston moves to the hydrogen gas filling device side by the elastic force of the elastic body attached to the piston. As a result, the externally visible display changes.

  In the piston according to the second aspect, by making the area of the first pressure receiving end face equal to the area of the second pressure receiving end face, the shape of the piston is simplified, the manufacturing is facilitated, and the manufacturing cost can be reduced. Here, the elastic body attached to the piston is not particularly limited as long as the piston moves to the hydrogen gas filling apparatus side by the elastic force of the elastic body when the filling is completed. For example, a spring can be used preferably.

  According to the mobile hydrogen station of the present invention, hydrogen gas can be filled in the hydrogen gas use facility with a relatively simple configuration, realizing miniaturization and energy saving, movable, and hydrogen gas in various places. There is an effect of enabling supply.

System configuration diagram of mobile hydrogen station of Example 1 System block diagram of mobile hydrogen station of Example 1 Front view of the trailer of Example 1 The top view of the trailer of Example 1. Right side view of the trailer of Example 1 External appearance front view of trailer of Example 1 The front view at the time of housing removal of the trailer of Example 1 External appearance top view of trailer of Example 1 External right side view of trailer of Example 1 Example of mounting trailer of Example 1 to tractor The external view of the dispenser of Example 1, (1) is a front view, (2) shows a side view. The internal structure figure of the dispenser of Example 1, (1) is a front view, (2) shows a side view. Front view of the trailer of Example 2 System configuration diagram of mobile hydrogen station of embodiment 3 System configuration diagram of mobile hydrogen station of embodiment 5 System configuration diagram of mobile hydrogen station of embodiment 6 System configuration diagram of mobile hydrogen station of embodiment 7 The top view of the trailer of Example 5. Sectional drawing of the filling coupler of Example 8, (1) shows the time of filling completion, (2) shows the time of filling. External view of filling coupler of embodiment 8

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. The scope of the present invention is not limited to the following examples and illustrated examples, and many changes and modifications can be made.

FIG. 1 shows a system configuration diagram of the mobile hydrogen station of the first embodiment.
As shown in FIG. 1, the hydrogen curdle 2 is connected to the gas accumulator unit 6, the pressure accumulator 3, and the dispenser 1, and from the filling coupler 19 provided in the dispenser 1 to the hydrogen gas use facility (FCV) 4. Filled with hydrogen gas. The gas accumulator unit 6, the pressure accumulator 3 and the dispenser 1 are mounted on a trailer 7.
The gas accumulator unit 6 is provided with valves (33, 34). By opening the valve 33 with the valve 34 closed, it is possible to fill the accumulator 3 with hydrogen gas from the hydrogen curdle 2. It is. In addition, by opening the valve 34 with the filling valve 33 closed, the hydrogen gas can be filled from the pressure accumulator 3 to the hydrogen gas using equipment 4. The main valve 46 can be manually opened and closed, and by closing it, it is possible to prevent hydrogen gas from leaking.

FIG. 2 shows a system block diagram of the mobile hydrogen station of the first embodiment.
The gas accumulator unit 6 fills the pressure accumulator 3 with hydrogen gas filled in the hydrogen curdle 2.
The gas storage unit 6 includes a valve (33, 34), a strainer 76 and a pressure valve 77. Although not shown, the gas storage unit 6 is provided with an N2 header, and plays a role of releasing hydrogen gas remaining in the gas storage unit 6. The accumulator 3 is provided with a main valve 46, and is used by opening the main valve 46 when filling the hydrogen gas from the hydrogen curdle 2 or filling the hydrogen gas using equipment 4 with the hydrogen gas. To do. Filling the pressure accumulator 3 with hydrogen gas from the hydrogen curdle 2 is performed by opening the valve 33 with the valve 34 closed. Further, the hydrogen gas filling from the pressure accumulator 3 to the hydrogen gas using equipment 4 is performed by opening the valve 34 with the valve 33 closed.
The hydrogen gas sent from the pressure accumulator 3 is sent from the hydrogen gas input port 1a provided in the dispenser 1 to the hydrogen gas output port 1b, and passes through the separation coupler 18 and the filling coupler 19 in this order, and the hydrogen gas using equipment 4 Filled.
In the present embodiment, since the pressure accumulator 3 contains a hydrogen storage alloy, the compressor 36 is not provided. However, as shown in FIG. 2, the hydrogen curdle 2 and the gas accumulator unit are provided. A compressor 36 may be provided between the six.

In FIG. 2, a system displayed in a straight line from the hydrogen gas input port 1 a to the hydrogen gas output port 1 b indicates a main system in the dispenser 1.
The hydrogen gas input port 1 a is connected to the hydrogen primary pressure gauge 11 through a joint 51. The hydrogen primary pressure gauge 11 is connected to the shutoff valve 12 through a joint 52. The shut-off valve 12 is connected to the strainer 13 via a joint 53. The strainer 13 is connected to the hydrogen pressure reducing valve 14 via a joint 54. The hydrogen pressure reducing valve 14 is connected to the orifice 15 through a joint 55. The orifice 15 is connected to the check valve 16 through a joint 56. The check valve 16 is connected to the hydrogen secondary pressure gauge 17 via a joint 57. The hydrogen secondary pressure gauge 17 is connected to the hydrogen gas output port 1b through a joint 58.
As described above, the main system of the dispenser 1 has a compact design including only joints without piping.

  The metal flexible hose connecting the hydrogen gas output port 1b and the hydrogen gas using equipment 4 is provided with a detaching coupler 18 and a filling coupler 19, and the filling coupler 19 is inserted into the hydrogen gas using equipment 4 and filled with hydrogen gas. The length of the metal flexible hose is approximately 4 m.

Next, the auxiliary system of the dispenser 1 will be described.
The shutoff valve 12 is connected to a selector switch 22 as an auxiliary system. Similarly, the selector switch 22 is connected to the N ₂ header 20 to which the nitrogen header pressure gauge 21 is connected. The selector switch 22 is connected to the cutoff valve 23. This shut-off valve 23 is connected to a joint 58. The joint 58 is connected to the manual valve 24 and the safety valve 25. The shut-off valve 23 and the manual valve 24 are connected to an exhaust orifice 26, and an exhaust pressure gauge 27, a back pressure valve 28, and a check valve 29 are sequentially connected to the exhaust port 1 c and connected to a frame arrester 30. The The safety valve 25 is connected to a check valve 29.

3-5 is explanatory drawing of the trailer of Example 1, FIG. 3 is a front view, FIG. 4 is a top view, FIG. 5 has shown the right view. As shown in FIGS. 3 and 5, the trailer 7 includes a pedestal portion 8 and a housing 9, and is placed on a road surface 45. In FIG. 3, the trailer 7 moves by being pulled by a towing vehicle such as a tractor from right to left during movement. The pedestal portion 8 is provided with a fixing portion 37, a coupler 38, a rear wheel 40 and a bumper 41, and the coupler 38 is provided with a front wheel 39. 4 and 5, the pressure accumulator 3 is installed on the fixed portion 37 inside the housing 9, and the dispenser 1 and the gas accumulator unit 6 are installed on the pedestal portion 8. A main valve 46 is provided at the joint between the pressure accumulator 3 and the gas accumulator unit 6, and the main valve 46 can be manually opened and closed. By closing the main valve 46, it is possible to prevent gas leakage of hydrogen gas. As shown in FIGS. 3 to 5, the gas storage unit 6 has a compact specification in which the piping is 20% or less and the rest is composed only of the joints.
Moreover, although not shown in figure, the gas storage unit 6 and the dispenser 1 are couple | bonded by the flexible piping etc.

  FIG. 6 is an external front view of the trailer according to the first embodiment. As shown in FIG. 6, the pressure accumulator, dispenser, and gas accumulator unit on the pedestal portion 8 are all covered with the housing 9 in a state where the pedestal portion 8 is covered with the housing 9. The pedestal portion 8 and the housing 9 are formed of a metal plate or the like. Further, since the trailer 7 is provided with a bumper 41, the trailer 7 has a structure capable of withstanding an impact. The housing 9 is provided with vent holes (42a, 42b) and a valve operation door 43. Since the vent hole 42a is provided downward and the vent hole 42b is provided laterally, the structure can prevent intrusion of rain or the like.

  FIG. 7 is a front view of the trailer according to the first embodiment when the housing is removed. As shown in FIG. 7, the housing 9 can be detached from the pedestal portion 8. By removing the housing 9, the inside of the housing 9 can be inspected. Although not shown, the housing 9 is provided with an opening / closing window, and the dispenser and the gas storage unit can be operated without removing the housing 9. The frame 50 is for protecting the pressure accumulator 3, and is formed of a high-strength material and has a structure that is resistant to impact.

  FIG. 8 is an external plan view of the trailer according to the first embodiment. As shown in FIG. 8, the housing 9 is provided with an operation door 49a for operating the gas storage unit and an operation door 49b for operating the dispenser. When filling with hydrogen gas or the like, the operation door (49a, 49b) is opened and the gas storage unit and the dispenser are operated. On the other hand, for example, when the trailer 7 is moved, the operation doors (49a, 49b) are closed and moved. In addition, a hydrogen gas detector sensor that detects the occurrence of hydrogen gas leak may be provided inside the housing 9.

  FIG. 9 is an external right side view of the trailer according to the first embodiment. As shown in FIG. 9, the housing 9 is provided with a valve operation door 43. The valve operation door 43 can be opened to open and close the main valve provided inside from the outside.

  FIG. 10 shows an example of attachment of the trailer of Example 1 to the tractor. As shown in FIG. 10, the trailer 7 is connected to the tractor 44 via a connector 38. It is possible to steer the tractor 44, transport the trailer 7, and fill hydrogen gas from the hydrogen curl to the pressure accumulator at the arrival destination, or charge hydrogen gas from the pressure accumulator to the hydrogen gas using equipment. . When the trailer 7 is connected to the tractor 44, the front wheel 39 is folded and used.

The external view and internal structure figure of the dispenser of Example 1 are shown in FIG. 11 and FIG. 12, respectively. In each figure, (1) is a front view and (2) is a side view.
As shown in FIG. 11 (1), a door 101a is provided on the front surface of the casing 101 of the dispenser 1, and a hydrogen gas input port 1a is provided on the left side as viewed from the front, and a hydrogen gas output is provided on the right side. A port 1b is provided, and a flow indicator 87 is attached to the hydrogen gas output port 1b. As shown in FIG. 11 (2), the front upper part of the housing part 101 is a slope, and a panel part 101c is provided on the slope.
The panel portion 101c is provided with a hydrogen primary pressure gauge 11, an instrumentation pressure gauge 91, an exhaust pressure gauge 88, a hydrogen secondary pressure gauge 17, and a selector switch 22.

The main system and auxiliary system of the dispenser of Example 1 will be described with reference to FIG.
First, the main system will be described. The hydrogen gas input port 1 a is connected to the hydrogen primary pressure gauge 11 via a joint 59. The hydrogen primary pressure gauge 11 is connected to an air operating valve 81 through a joint 60. The air operating valve 81 is connected to the strainer 13 via the joint 61. The strainer 13 is connected to the hydrogen pressure reducing valve 14 via joints (62, 63, 64). The hydrogen pressure reducing valve 14 is connected to the orifice 83 via a joint 65. The orifice 83 is connected to the check valve 16 through joints (66, 67, 68). The check valve 16 is connected to the pipe 93 via a joint (69, 71). The pipe 93 is connected to the hydrogen secondary pressure gauge 17 through the joint 70. The hydrogen secondary pressure gauge 17 is connected to a flow indicator 87 via a joint 72 and connected to the hydrogen gas output port 1b.

Next, the auxiliary system will be described. The joints (69, 71) in the main system are connected to the air operation valve 82 via the joint 73. The joints (69, 71) are also connected to the purge valve 85 via the joint 74. Further, the joints (69, 71) are also connected to the safety valve 86 via the joint 75. The air operating valve 82 and the purge valve 85 are connected to the exhaust port 1c via the orifice 84 and the back pressure valve 89, and further via the check valve 90. Further, the safety valve 86 is connected to the exhaust port 1 c via the check valve 90 without passing through the orifice 84 and the back pressure valve 89.
As described above, the main system of the dispenser has only a part of piping, and basically, devices such as valves, meters, and orifices are connected only by joints. The dispenser of this embodiment has a width W of 540 mm, a height H of 690 mm, and a depth D of 330 mm.

FIG. 14 is a front view of the trailer according to the second embodiment. As shown in FIG. 14, unlike Example 1, the pedestal portion 8 of the trailer 7 is provided with rear wheels (40a, 40b). This can withstand heavier weights. Therefore, six pressure accumulators 3 are fixed to the frame 50 in front view. Although not shown, since the pressure accumulators 3 are arranged in three rows toward the back, a total of 18 pressure accumulators 3 are installed. Similar to the first embodiment, the frame 50 is made of a material having high strength and has a structure that is resistant to impact. Further, the same number of valve operation doors 43 are provided according to the number of the pressure accumulators 3. As shown in FIG. 14, the pressure accumulator 3 is installed so that the main valve 46 is on the outside so that the main valve 46 can be operated even from the outside of the housing. In this way, depending on the specifications of the trailer 7, a large number of pressure accumulators 3 can be provided.
Further, not only the number of the pressure accumulators 3 but also the filling amount and the filling pressure can be increased or decreased. Here, for example, the filling pressure can be increased or decreased in the range of 20 to 40 MPa.
When a plurality of pressure accumulators are provided, when filling hydrogen gas into the hydrogen gas use facility, the plurality of pressure accumulators are not used at the same time, but are filled one by one. Thereby, the high voltage | pressure part of an accumulator can be utilized effectively.
Further, although not shown, the mechanism shown in the first embodiment such as a vent may be provided.

FIG. 14 shows a system configuration diagram of the mobile hydrogen station of the third embodiment.
In addition to the configuration of the first embodiment, the hydrogen gas filling device in the mobile hydrogen station of the present embodiment further includes a fuel cell unit 10 and a compressor 3. When the pressure of the residual hydrogen gas in the hydrogen curd 2 reaches a low pressure (0.05 to 1 MPa) that is a predetermined threshold value or less, the residual hydrogen gas is supplied to the fuel cell unit 10. Thereby, the fuel cell unit 10 can be used as an emergency power source or a power saving power source of the hydrogen gas filling device. Here, the power supply to the fuel cell unit 10 may be supplied from the accumulator 3.
The compressor 36 receives power supply from the fuel cell unit 10, compresses the hydrogen gas sent from the hydrogen curdle 2, and sends it to the pressure accumulator 3. Since the hydrogen curdle 2 is not mounted on the trailer 7, it is used by connecting to the hydrogen curdle 2 at the place where the trailer 7 arrives.
The electric power generated by the fuel cell unit 10 using the residual hydrogen gas is supplied not only to the compressor 36 but also to the dispenser 1 via the power supply cable 35. Further, the emergency shutoff valve can be moved by the electric power.

A touch panel for display operation and a programmable logic controller (PLC) may be mounted on the dispenser or the gas storage unit. The display and operation of the touch panel are performed using electric power supplied to the battery from the fuel cell unit mounted on the trailer. The configuration of the fuel cell unit is the same as that in the second embodiment.
A temperature sensor and a pressure sensor are provided in the hydrogen gas accumulator, and the temperature and pressure of the accumulator can be measured to display the hydrogen gas filling amount on the touch panel.
By adopting the touch panel method, it is possible to perform automatic control such that hydrogen gas is charged from the pressure accumulator to the hydrogen using facility with one touch and automatically stops after the filling is completed.

FIG. 15 shows a system configuration diagram of the mobile hydrogen station of the fifth embodiment. As shown in FIG. 15, the hydrogen curdle 2 is connected to the gas accumulator unit 6, the pressure accumulator 3 and the dispenser 1, and the hydrogen gas use facility 4 is filled with hydrogen gas from the filling coupler 19 provided in the dispenser 1. Is done. The gas accumulator unit 6 and the pressure accumulator 3 are mounted on a trailer 7. The dispenser 1 is not mounted on the trailer 7, but can be mounted. Further, the dispenser 1 may have a structure that can be detached from the trailer 7.
FIG. 18 is a plan view of the trailer according to the fifth embodiment. As shown in FIG. 18, the trailer 7 is not equipped with a dispenser. Even if the dispenser is not mounted on the trailer 7, if the dispenser is installed at the hydrogen gas filling facility in the hydrogen gas using facility, the accumulator 3 and the dispenser are connected at the filling location to the hydrogen gas using facility. It is possible to fill with gas. In addition, this reduces the weight of the system and facilitates movement of the trailer 7.

FIG. 16 shows a system configuration diagram of the mobile hydrogen station of the sixth embodiment. As shown in FIG. 16, the hydrogen curdle 2 is connected to the gas accumulator unit 6, the pressure accumulator 3 and the dispenser 1. The gas storage unit 6 is provided with a gas vent connector 47 for extracting hydrogen gas from the hydrogen gas using facility 4.
The gas accumulator unit 6 is provided with valves (33, 34, 48). By opening the valve 33 with the valves (34, 48) closed, hydrogen gas is transferred from the hydrogen curd 2 to the pressure accumulator 3. Can be filled. Further, by opening the valve 34 with the filling valves (33, 48) closed, the hydrogen gas can be filled from the pressure accumulator 3 to the hydrogen gas using equipment 4. Furthermore, it is possible to extract hydrogen gas from the hydrogen gas use facility 4 by opening the valve 48 with the filling valves (33, 34) closed.

FIG. 17 shows a system configuration diagram of the mobile hydrogen station of the seventh embodiment. As shown in FIG. 17, the hydrogen curdle 2 is connected to the gas accumulator unit 6, the pressure accumulator 3, and the dispenser 1, and hydrogen is supplied from the filling coupler 19 provided in the dispenser 1 to the hydrogen gas use facility (FCV) 4. Filled with gas. The gas accumulator unit 6, the pressure accumulator 3 and the dispenser 1 are mounted on a trailer 7. Between the pressure accumulator 3 and the dispenser 1, an adiabatic expansion chamber 48 for adiabatic expansion of hydrogen gas is provided. Although not shown, an orifice is provided at the input port from the pressure accumulator 3 to the adiabatic expansion chamber 48. When the hydrogen gas accumulated in the pressure accumulator 3 moves to the adiabatic expansion chamber 48, the hydrogen gas expands and the average intermolecular distance increases. At that time, since the internal energy is constant, when the potential energy resulting from van der Waals attraction increases, the average kinetic energy of the molecule decreases by the increase. That is, the temperature of the hydrogen gas is lowered. Therefore, the adiabatic expansion chamber 48 can be used as a precooler that utilizes the adiabatic expansion function. Although the temperature of the hydrogen gas sent from the pressure accumulator 3 to the adiabatic expansion chamber 48 increases due to thermal expansion, it is dissipated and cooled by a mechanism provided in the adiabatic expansion chamber 48. Thus, by providing the chamber 48 for adiabatic expansion, it is possible to suppress a rapid temperature rise of the hydrogen gas when the hydrogen gas use facility 4 is filled with the hydrogen gas.
Note that the enthalpy (H), which is the amount of state in thermodynamics, is defined as H = U + PV using internal energy (U), pressure (P), and volume (V). When hydrogen gas is subjected to isoenthalpy adiabatic expansion, the temperature of the expanded gas changes. In the case of hydrogen, the temperature (reversal temperature) at which the rise and fall associated with expansion are interchanged is approximately −80 ° C. If it is near room temperature, the Joule-Thomson coefficient, which is the ratio of the temperature drop to the change in hydrogen gas pressure Is a negative value, and the temperature rises when hydrogen gas expands and the pressure decreases (Joule-Thomson effect). However, the contribution of the temperature rise due to the Joule-Thomson effect is small, and it is remarkable that the temperature is lowered due to the loss of internal energy due to adiabatic expansion, so that the temperature of the hydrogen gas is lowered.

FIG. 19 shows a cross-sectional view of the filled coupler of the eighth embodiment. (1) is when filling is completed, and (2) is when filling.
The piston 6 is disposed inside the inner cylindrical portion 19a of the filling coupler 19, and an insertion member 19b is provided on the output side. The insertion surface 19c is connected to an input portion (not shown) of the hydrogen gas using facility (FCV) 4. To be filled with hydrogen gas. The piston 106 is arranged in a movable state in a direction transverse to the hydrogen gas flow path, that is, on the left and right as shown in FIG.
The piston 106 has a first pressure receiving end surface 106a that receives a first pressure from the hydrogen gas filling device side in a direction that traverses the flow path, and a second pressure from the hydrogen gas using facility side that traverses the flow path. And a second pressure receiving end face 106b. The area _{D 1} of the first pressure-supporting end face 106a of the piston 6 is smaller than the area _{D 2} of the second pressure-supporting end face 106b, the through hole 106c is provided from the first pressure-supporting end face 106a toward the second pressure-supporting end face 106b It has been.

  The inner cylinder portion 19a is provided with an opening portion 19e. The opening portion 19e is provided with a joining member 107 attached to the central portion of the side peripheral surface of the piston 106 in a direction perpendicular to the axial direction of the piston 106. An outer cylinder portion 108 is provided at the other end of the joining member 107. Thus, since the outer cylinder part 108 is connected to the piston 106 via the joining member 107, if the piston 106 moves to the right, the outer cylinder part 108 also moves to the right, and if the piston 106 moves to the left. The outer cylinder part 108 is also structured to move to the left.

FIG. 20 shows an external view of the filling coupler of the eighth embodiment.
In this embodiment, as shown in FIG. 20 (1), the display line (141, 142) is displayed on the inner cylinder portion 19a, for example, blue when filling, and red when filling is completed. It is provided with different colors.
During the hydrogen gas filling, as shown in FIG. 19 (2), the piston is moved to the hydrogen gas using equipment side by the pressure difference between the hydrogen gas filling device side on the high pressure side and the hydrogen gas using equipment side on the low pressure side. It moves and the blue display line 141 can be seen from the outside, and it can confirm that it is filling.
When the hydrogen gas filling is completed, as shown in FIG. 19 (1), the hydrogen gas filling device side and the hydrogen gas using equipment side have the same pressure, and the piston moves to the hydrogen gas filling device side, whereby the red display line 142 Can be seen from the outside, and the completion of filling can be confirmed.

  In this embodiment, as shown in FIG. 20 (1), display lines (141, 142) are provided at positions outside the outer cylinder member. However, the indicator may change the display visible from the outside. 20 (2), display lines (143, 144) may be provided below the display window 145.

  The present invention is useful for hydrogen stations such as FCV and hydrogen filling devices for hydrogen fuel cells.

1 Dispenser 1a Hydrogen gas input port 1b Hydrogen gas output port 1c Exhaust port 2 Hydrogen curdle 3 Pressure accumulator 4 Hydrogen gas use facility (FCV)
5a, 5b, 33, 34, 48 Valve 6 Gas storage unit 7 Trailer 8 Seat 9 Housing 10 Fuel cell unit 11 Hydrogen primary pressure gauge 12 Shut-off valve 13, 76 Strainer 14 Hydrogen pressure reducing valve 15 Orifice 16 Check valve 17 Hydrogen secondary pressure gauge 18 Detachment coupler 19 Filling coupler 20 N ₂ header 21 Nitrogen header pressure gauge 22 Selector switch 23 Shut-off valve 24 Manual valve 25 Safety valve 26 Exhaust orifice 27 Exhaust pressure gauge 28 Back pressure valve 29 Check valve 30 Frame arrester 35 Power supply cable 36 Compressor 37 Fixed part 38 Coupler 39 Front wheel 40 Rear wheel 41 Bumper 42 Vent hole 43 Valve operation door 44 Tractor 45 Road surface 46 Main valve 47 Gas vent connector 48 Thermal expansion chamber 49a, 49b Operation door 5 Frame 51-75 joint 77 pressure valve 81, 82 the air actuated valves 83, 84 orifice 85 purge valve 86 safety valve 87 Flow indicator 88 exhaust pressure gauge 89 the back pressure valve 90 check valve 91 Instrumentation pressure gauge 93 pipe 95 N ₂ header 97 vent Pipe 101 Housing portion 101a Door portion 101b Handle 101c Panel portion 106 Piston 106a First pressure receiving end surface 106b Second pressure receiving end surface 106c Through hole 107 Joining member 108 Outer tube portion 141, 142, 143, 144 Display line 145 Display window

Claims (14)

A hydrogen gas filling device by a differential pressure filling method for supplying hydrogen gas to a facility using hydrogen gas at a predetermined pressure,
Hydrogen gas pressure accumulator that stores hydrogen gas in a compressed state, a gas accumulator unit that fills the hydrogen gas pressure accumulator with the hydrogen gas, and a fixed amount of hydrogen gas accumulated in the hydrogen gas pressure accumulator to discharge hydrogen A dispenser that fills gas-using equipment,
The hydrogen gas pressure accumulator, the gas accumulator unit, and the dispenser are mounted on a pedestal portion of a trailer that can be pulled by a towing vehicle, and the dispenser is movable and can be separated and removed from the pedestal portion of the trailer. Alternatively, the mobile hydrogen station is characterized in that the dispenser is fixed to a pedestal portion of the trailer. The trailer has a housing that covers the pedestal,
The housing is provided with a ventilation valve and a main valve operation door for manually opening and closing the main valve of the hydrogen gas pressure accumulator,
2. The mobile hydrogen according to claim 1, wherein the main valve operation door is provided at a position that allows the main valve to be manually opened and closed in a state where the housing is installed on the pedestal portion. station. A fuel cell unit is further mounted on the pedestal,
When the pressure of the residual hydrogen gas in the hydrogen gas accumulator reaches a low pressure below a predetermined threshold, the residual hydrogen gas is supplied to the fuel cell unit,
The mobile hydrogen station according to claim 1 or 2, wherein the fuel cell unit is used as an emergency power source or a power saving power source of the hydrogen gas filling device.   A compressor is further provided in the pedestal portion, and the compressor is movable and can be separated and removed from the pedestal portion of the trailer, or the compressor is fixed to the pedestal portion of the trailer, and the compressor The mobile hydrogen station according to claim 1, wherein the hydrogen gas accumulator is compressed and filled with the hydrogen gas. The dispenser is composed only of a joint without piping in the main system from the hydrogen gas input port to the hydrogen gas output port,
Or
The number of pipes is 20% or less of the total number of joints in a configuration in which pipes remain in a part of the main system,
The mobile hydrogen station according to any one of claims 1 to 4, wherein:   The said hydrogen gas accumulator is equipped with a cooling means for cooling the hydrogen gas accumulated in the accumulator, and can function as a precooler of a hydrogen gas filling apparatus by a differential pressure filling method. The mobile hydrogen station according to any one of the above.   The hydrogen gas accumulator calculates a flow rate and a filling amount of hydrogen gas to be filled in the hydrogen gas use facility by measuring a pressure and a temperature of the hydrogen gas accumulated in the accumulator. Item 7. The mobile hydrogen station according to any one of Items 1 to 6. The hydrogen gas pressure accumulator has a built-in hydrogen storage alloy,
Pressurizing means for heating the hydrogen storage alloy to release the hydrogen gas stored in the hydrogen storage alloy and increasing the hydrogen gas pressure;
The mobile hydrogen station according to any one of claims 1 to 7, further comprising pressure reducing means for cooling the hydrogen storage alloy to promote storage of hydrogen gas and reduce the pressure of hydrogen gas. In the dispenser,
The mobile hydrogen station according to claim 1, wherein the quantitative discharge of the hydrogen gas is performed using a throttle mechanism of a circular pipe line by an orifice. The dispenser comprises a control nitrogen supply container for supplying nitrogen used for control equipment in the dispenser,
The control nitrogen supply container is a nitrogen cylinder provided outside the dispenser, and is filled with nitrogen periodically or when the nitrogen pressure drops from a nitrogen cylinder having a larger capacity than the control nitrogen supply container. The mobile hydrogen station according to any one of claims 1 to 9.   The mobile hydrogen station according to claim 1, wherein the gas storage unit is provided with a gas vent connector for extracting gas from the hydrogen gas use facility. Between the hydrogen gas pressure accumulator and the dispenser, an adiabatic expansion chamber for adiabatic expansion of hydrogen gas is provided.
When the hydrogen gas accumulated in the hydrogen gas accumulator moves to the adiabatic expansion chamber, the hydrogen gas expands and the average intermolecular distance increases, increasing the potential energy due to van der Waals attraction. The mobile hydrogen station according to any one of claims 1 to 11, wherein the average kinetic energy of the molecules is reduced by a corresponding amount and the temperature of the hydrogen gas is lowered. An indicator for displaying the flow of hydrogen gas when the hydrogen gas output from the dispenser is filled in the hydrogen gas use facility is provided,
The indicator is
A piston arranged in a state movable in a direction traversing a flow path of hydrogen gas, a first pressure receiving end face receiving a first pressure from the hydrogen gas filling device side in a direction traversing the flow path; A piston including a second pressure receiving end face that receives a second pressure from the side of the hydrogen gas using facility in a direction that passes through the flow path;
The piston is
The area of the first pressure receiving end face is smaller than the area of the second pressure receiving end face,
A through hole is provided from the first pressure receiving end surface to the second pressure receiving end surface,
The first pressure receiving end face is disposed on the hydrogen gas filling device side, the second pressure receiving end face is disposed on the hydrogen gas using facility side,
During filling, due to the pressure difference between the hydrogen gas filling device side which is the high pressure side and the hydrogen gas using equipment side which is the low pressure side, the piston moves to the hydrogen gas using equipment side,
When the filling is completed, the hydrogen gas filling device side and the hydrogen gas using equipment side have the same pressure, and the display visible from the outside changes when the piston moves to the hydrogen gas filling device side. The mobile hydrogen station according to any one of 1 to 12. An indicator for displaying the flow of hydrogen gas when the hydrogen gas output from the dispenser is filled in the hydrogen gas use facility is provided,
The indicator is
A piston arranged in a state movable in a direction traversing a flow path of hydrogen gas, a first pressure receiving end face receiving a first pressure from the hydrogen gas filling device side in a direction traversing the flow path; A piston including a second pressure receiving end face that receives a second pressure from the side of the hydrogen gas using facility in a direction that passes through the flow path;
The piston is
The area of the first pressure receiving end face is equal to the area of the second pressure receiving end face,
A through hole is provided from the first pressure receiving end surface to the second pressure receiving end surface,
The first pressure receiving end face is disposed on the hydrogen gas filling device side, the second pressure receiving end face is disposed on the hydrogen gas using facility side,
During filling, due to the pressure difference between the hydrogen gas filling device side which is the high pressure side and the hydrogen gas using equipment side which is the low pressure side, the piston moves to the hydrogen gas using equipment side,
When the filling is completed, the hydrogen gas filling device side and the hydrogen gas using equipment side have the same pressure, and the piston moves to the hydrogen gas filling device side by the elastic force of the elastic body attached to the piston, so that the external The mobile hydrogen station according to any one of claims 1 to 12, wherein the display visible from the side changes.