KR20120114055A - Ship using bog for dynamic positioning system - Google Patents

Abstract

A vessel using a BOG for a vessel position control apparatus is disclosed.
The vessel using the BOG in the ship position control apparatus according to an embodiment of the present invention is a BOG (Boil-Off Gas) line for providing a movement path of the BOG from each of the one or more tanks, the first compressor installed in the BOG line, and A BOG heater installed at the output BOG line of the first compressor, a power generator installed at the end of the BOG line of the BOG heater, a BOG generator for generating power from the power generated by the power generator, and a BOG generator A voltage control device connected to an output side for receiving the generated power and converting the generated power into used power, a power supply network connected to a power output terminal of the voltage control device, and a ship position control device installed on a ship as a power consumption source connected to the power supply network; It may include.

Description

SHIP USING BOG FOR DYNAMIC POSITIONING SYSTEM

The present invention relates to a vessel using a BOG for the vessel position control device using the generated power for the vessel position control device by processing the BOG (Boil-Off Gas) to produce power and produce power.

In general, natural gas is transported in gas state through onshore or offshore gas piping, or stored in LNG carriers in the form of liquefied natural gas (LNG). Is carried.

The LNG is obtained by cooling the natural gas to a cryogenic state of about -163 degrees Celsius, and its volume is reduced to approximately 1/600 than that of the natural gas in the gas state, so it is very suitable for long distance transportation by sea.

Such LNG carriers have LNG storage tanks that can withstand cryogenic temperatures in order to load LNG and to navigate the sea to unload LNG to land demand.

An apparatus for treating boil-off gas in an LNG carrier having an LNG storage tank according to the prior art is a liquefied natural gas (LNG, Liquefied) loaded on a storage tank 10 in an LNG carrier using an electric propulsion system, as shown in FIG. 1. Natural Gas) is to stabilize the internal pressure of the storage tank 10 by treating the evaporated gas generated by natural vaporization.

The conventional boil-off gas treatment apparatus has a generator 30 having a dual fuel engine 32 and a gas turbine generator 34 and a pressure of the boil-off gas introduced into the generator 30 to produce electricity necessary for propulsion and operation of the vessel. It is composed of a gas fuel compressor 20 for increasing the number and the load bank 40 for converting the electricity into heat to discharge to the outside. The low pressure gas pipe 50 is piped between the storage tank 10 and the gas fuel compressor 20. The high pressure gas pipe 60 is piped between the gas fuel compressor 20 and the generator 30. The power transmission cable 70 is connected between the generator 30 and the load bank 40.

However, the boil-off gas treatment apparatus according to the prior art burns the boil-off gas in the generator 30 for the purpose of stabilizing the internal pressure of the storage tank 10, and also the power of the generator 30 in the load bank 40. Since the energy is converted into heat and released to the outside, power energy is inevitably consumed through the load bank 40.

Here, the load bank 40 may generate more power than necessary in the generator 30 when the boil-off gas is excessively generated according to the change of the situation during the ship operation, and may not produce more power than necessary in the generator 30. In this case, the excessively generated boil-off gas may cause a state in which the pressure of the storage tank cannot be maintained at an appropriate level.

Therefore, in the prior art, even when power energy is consumed in the load bank 40, surplus power produced by excessively generated boil-off gas is simply converted into heat in the load bank 40 to be discharged, thereby degrading energy utilization. Has

In addition, with the development of eco-friendly ship technology, the use of ship positioning control (Dynamic Positioning), etc., the power demand is increasing in the ship compared to the past.

However, prior art vessels, in addition to increasing the capacity of the existing generator and consume more fuel for generators, when using the boil-off gas as the energy source of the eco-friendly vessel, it does not propose a way to use more efficiently, As a result, there is a need for an environment-friendly technology that can be used for the ship position control device while stabilizing the pressure of the boil-off gas in the storage tank and minimizing the consumption of energy.

An embodiment of the present invention is devised to solve the above problems, while producing a BOG (Boil-Off Gas) to maintain a constant pressure in the fuel tank or storage tank while using it as a power production and power production To use power supply to power consumer including ship position control device.

According to an aspect of the present invention, a BOG (Boil-Off Gas) line for providing a movement path of the BOG from the tank, the first compressor installed in the BOG line, and the BOG line, the rear end of the first compressor A BOG heater disposed at the outlet, a power generator installed at an end of the BOG line of the output side of the BOG heater, a BOG generator for generating power from the power generated by the power generator, and connected to an output side of the BOG generator. A BOG comprising a voltage control device that receives power and converts the power into used power, a power supply network connected to a power output terminal of the voltage control device, and a ship position control device installed on the ship as a power consumption source connected to the power supply network. A vessel for use in the position control device can be provided.

In addition, the power consumption destination may include a main pump or the voltage control device installed in the tank.

In addition, the power consumption destination may be a vessel position control device installed in the vessel, the main pump installed in one of the tank.

In addition, the power production apparatus may be any one of a diesel engine, a dual fuel diesel engine, a gas turbine apparatus, a steam boiler, and a steam turbine apparatus.

In addition, the voltage control device has a power generation input terminal on the output side of the BOG generator, a commercial power input terminal configured separately from the power generation input terminal, a power storage terminal and a power output terminal, switching circuit for performing the switching operation for inter-terminal interruption It may include a power supply switching unit having a.

In addition, the voltage control device checks the power consumption of the vessel position control device and the power consumption of the main pump as a check value, and compares the check value to a predetermined operation status reference value for safe operation of the control object. Correspondingly, by controlling the switching operation of the electrical switching circuit of the power supply switching unit, the operation status management unit for converting any one of the commercial power in the ship and the generated power generated in the BOG generator to the power used to supply to the power consumer It may include.

In addition, the voltage control device is one or more for generating a relatively small size of the generation power generated in the BOG generator, the storage power of the relatively weak size compared to the operating conditions reference value to utilize in the device requiring storage power The power storage unit may further include a charging cell and a charging circuit.

The vessel may further include a bypass line installed in the BOG line to bypass the BOG, and a second compressor installed in the bypass line.

In addition, the vessel position control device is obtained through a swing-type propeller having an electric motor installed on the vessel and operated by the power used, one or more inclination sensors installed on the vessel, and information or satellite navigation device coming from the inclination sensor It may include a dynamic position control module for controlling the swivel propeller to stably restore the attitude or balance of the vessel by analyzing the position adjustment information.

Embodiment of the present invention by using the BOG (Boil-Off Gas) generated in the storage tank or the fuel tank for storing the liquefied fuel gas utilized in power production and power production by using the power produced in the vessel position control device Energy waste can be minimized.

In addition, the embodiment of the present invention is a voltage control device to convert any one of the commercial power in the ship and the generated power generated in the BOG generator into the use power to control the supply to the ship position control device or the main pump power used in the ship Supply can be managed more efficiently.

In addition, another embodiment of the present invention may be provided with a vessel position control device as a floating structure in the form of a floating station to fill the liquefied fuel gas in the vessel or offshore structure using the liquefied fuel gas as a fuel, Accordingly, when the liquefied fuel gas is charged to the partner vessel or the offshore structure, the BOG can be used in the vessel position control device, thereby saving energy without simply discharging or consuming the BOG.

1 is a block diagram of a boil-off gas treatment apparatus according to the prior art.
2 is a block diagram showing a vessel using a BOG in the vessel position control apparatus according to an embodiment of the present invention.
3 is a block diagram for explaining a device configuration using a BOG provided in the vessel of Figure 2 in the vessel position control device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a block diagram showing a vessel using a BOG in the vessel position control apparatus according to an embodiment of the present invention.

This embodiment may be a vessel 100 using the BOG in the vessel position control device.

For example, the ship 100 of the present embodiment may be a ship having self-defense capability and having a dynamic positioning system. That is, any one of the liquefied fuel gas storage facility (80) (bunkering facility), liquefied fuel gas carrier (SHUTTLE TANKER), the fuel supply line and the liquefied fuel gas supply line, any of the liquefied fuel gas can be carried and filled Since it may be a float, it may not be limited thereto. In addition, the vessel 100 may include a floating offshore structure.

In addition, the ship 100 of the present embodiment stores a liquefied fuel gas such as LNG, and at least one tank 101, 102, for example, a fuel tank 101 or a storage tank 102, in which BOG can be generated, respectively. It can be arranged.

The fuel tank 101 or the storage tank 102 is configured to store liquefied fuel gas therein, and may be configured by applying a membrane type or a type B, type C independent type cargo hold defined by IMO.

The fuel tank 101 or the storage tank 102 may be configured in a structure capable of 1-row or 2-row, in addition to the main pump 705 for liquefied fuel gas or LNG delivery. Necessary equipment for loading and unloading of LNG, or spray pump (not shown), supply line 130, 132, spray line, delivery line 131, safety valve for pressure control, temperature and pressure detector, gas A detection device or the like may be provided as in a typical LNG carrier.

In addition, the ship 100 of the present embodiment may be further provided with a manifold 103 for loading and unloading liquefied fuel gas.

Meanwhile, the vessel position control apparatus 700 may be installed in the vessel 100 of the present embodiment.

FIG. 3 is a block diagram for explaining an apparatus configuration using a BOG for the vessel position control apparatus 700 provided in the vessel 100 of FIG.

Referring to FIG. 3, the vessel position control apparatus 700 includes swing thrusters 701 and 702 (eg, azimuth thruster or azipod) having electric motors installed in the vessel 100 and operated by electric power, and the vessel. At least one inclination sensor 703 installed in the 100 and the position or balance of the vessel 100 by analyzing the information received from the inclination sensor 703 or position adjustment information obtained through the satellite navigation device (not shown). It may include a dynamic position control module 704 for controlling the swinging thrusters (701, 702) to restore the stably.

Here, the swing thrusters 701 and 702 are mounted on the vessel 100 so as to be able to rotate in all directions around the axis, and may be underwater propellers configured by using propellers operated using electric power.

In addition, the dynamic position control module 704 may be included in an integrated automation system (eg, IAS, Integrated Automation System) provided in the ship.

In this embodiment, the voltage control device 600 may be included.

The voltage control device 600 may play a role of supplying and managing power to a power consumer by converting the generation power 170 or the commercial power 620 into used power.

For example, the voltage control device 600 may be configured in the form of a switch board for ships in terms of hardware configuration.

The generator power source 170 may mean power output from the BOG generator 500.

The commercial power source 620 may be an existing power commonly used in a ship, or may mean an output power of a commercial generator (not shown) that is already provided in the ship.

The used power may refer to power converted from the power generation power source 170 or the commercial power source 620 in the voltage controller 600 so that the power consumption source can be used.

For example, the power consumption destination may be a voltage control device 600, a ship position control device 700, a main pump 705, etc., but is not limited thereto and may be connected to the power supply network 180 to use any power used. It may be an electrical or electronic device in a ship.

In addition, the voltage control device 600 converts any one of the commercial power source 620 and the generation power source 170 generated by the BOG generator 500 in the vessel 100 to the power used by the vessel position control apparatus 700 or main As supplied to the pump 705, the power supply can be controlled to more efficiently manage the power supply used in the ship.

In the present embodiment, the BOG lines 150 and 152 which provide the movement path of the BOG from the fuel tank 101 or the storage tank 102, the first compressor 200 installed in the BOG line 150, and the BOG line ( A bypass line 151 installed at 150 to bypass the BOG, a second compressor 200a installed at the bypass line 151, and a BOG line 150 installed at a rear end of the first compressor 200. BOG heater 300 disposed in the power generation apparatus 400 installed at the end of the BOG line 150, the output side BOG line 150 of the BOG heater 300, and BOG for generating power generated by the power generated from the power production apparatus 400 The generator 500 may include a voltage controller 600 connected to an output side of the BOG generator 500 to receive the generator power 170.

The BOG lines 150 and 152, the supply and demand lines 130 and 132, and the delivery line 131 may be further provided with a marine valve for controlling the flow rate, respectively.

BOG can be generated not only in the fuel tank 101, but also from the storage tank 102, and can be supplied for liquefied fuel gas.

The control valves 210, 211, 212, and 213 are further installed at the BOG line 150 or the bypass line 151 at the front or rear side of each of the first and second compressors 200a and 200a. It may be designed to control the bypass.

The first compressor 200 and the second compressor 200a may be designed to play a role of compressing and supplying BOG in accordance with fuel supply conditions, and may be configured as multistage compressors, respectively.

Here, the second compressor 200a may be configured to be operable in the same specification as the first compressor 200, and may be configured to play a backup role of the first compressor 200.

In addition, the second compressor 200a is configured to be operable in a different specification from that of the first compressor 200, and thus is not used when the first compressor 200 is used according to the fuel supply condition. Can be used when fuel supply conditions are not used.

The BOG heater 300 may play a role of controlling the temperature so that the compressed BOG can be used in the power generator 400, or may serve to vaporize the compressed BOG by applying heat to the compressed BOG.

The power production apparatus 400 may be any one of a diesel engine, a double fuel diesel engine, a gas turbine device, a steam boiler, and a steam turbine device.

The BOG generator 500 may be a generator that is operated by the power of the power generator 400 to generate power. The output side of the BOG generator 500 may be connected to the power generation input terminal 601 of the voltage control device 600 through a wire.

The voltage control device 600 has a power generation power input terminal 601, a commercial power supply input terminal 602, a power storage terminal 603, and a power output terminal 604 separately configured from the power generation power input terminal 601. It may include a power supply switching unit 610 having a switching circuit electrically configured to perform a switching operation for the interruption between the terminals (601, 602, 603, 604).

In addition, the voltage control device 600 checks the power consumption of the ship position control device 700 and the power usage of the main pump 705 as a check value, and manages the check value in advance for the safe operation of the control object. Corresponding to the result compared with the operation status reference value, the operation status management unit 630 for controlling the switching operation of the electrical switching circuit of the power supply switching unit 610 may be included.

For example, the driving situation manager 630 may be connected to the power meter through a connection line. Here, the power meter may be installed in the ship position control device 700 and the main pump 705, respectively.

Therefore, the operation status management unit 630 checks the power consumption of the vessel position control apparatus 700 and the power consumption of the main pump 705 through a power meter, and generates power of the power supply switching unit 610 corresponding to the check value. Controls the switching operation of the electrical switching circuit of the power supply switching unit 610 so that any one of the power input terminal 601 and the commercial power input terminal 602 is electrically connected to the power output terminal 604, and is connected and energized. Any one of the generated power source 170 or the commercial power source 620 may be converted into use power, and the converted power may be supplied to the vessel position control apparatus 700.

In addition, the voltage control device 600 when the power generation power of the relatively weak size compared to the operation status reference value is generated in the BOG generator 500, the storage power of the relatively small size, that is to accumulate power storage power is stored. A power storage unit 640 having one or more charging cells and a charging circuit for use in the required device may be included.

Here, the power storage unit 640 may be configured to interlock with the driving situation management unit 630. For example, while supplying the commercial power 620 to the ship position control apparatus 700, the relatively weak power generation 170 is generated by the BOG generator 500 can be checked by the operation status management unit 630. have.

Accordingly, the operation status management unit 630 electrically connects the generated power supply input terminal 601 of the power supply switching unit 610 to the power storage terminal 603, and connects the commercial power supply input terminal 602 to the power output terminal 604. ), The switching operation of the electrical switching circuit of the power supply switching unit 610 may be controlled.

As a result, the commercial power 620 may be supplied to the ship position control device 700 side, the relatively weak power generation power 170 may be supplied to the power storage unit 640.

The power output terminal 604 of the voltage control device 600 may be connected to the ship position control device 700 or the main pump 705 which is a power consumer through the power supply network 180 provided in the ship.

In addition, the operation status management unit 630 of the voltage control device 600 includes a database management program (DBMS) for recording and storing operation status values of the ship position control apparatus 700 or the main pump 705, a switching operation controller, A comparator for comparing the power consumption of the vessel position control apparatus 700 and the power consumption of the main pump 705 with the operation status reference value of the control object, the power consumption of various control objects, and the power generation power 170 of the BOG generator 500. ), Or the output current of a commercial generator (not shown) on board the vessel.

Hereinafter, a method of using BOG in a ship position control device in a ship will be described.

In the present embodiment, when the BOG (Boil-Off Gas) is treated to maintain a constant pressure in the fuel tank 101 or the storage tank 102, and at the same time, the generated power is used as a ship position. It is used for the operation of the control apparatus 700.

Referring to FIG. 2, a process of transmitting or filling liquefied fuel gas in a state in which the vessel 100 of the present embodiment is moored to the liquefied fuel gas storage facility 80 or the charging target 90, or the vessel 100 is oceanic. When at sea, BOG may be generated in fuel tank 101 or storage tank 102.

Referring to FIG. 3, the generated BOG may be compressed via the first compressor 200 or the second compressor 200a to be compressed to the required pressure through the BOG lines 150 and 152 or the bypass line 151. do.

Here, on the BOG lines 150 and 152, the BOG is pressurized by the first compressor 200 or the second compressor 200a, and is processed to be used as fuel by the BOG heater 300 to produce the power generator 400. ) Can be supplied.

The power production apparatus 400 produces power by the supplied BOG.

The BOG generator 500 is operated with the produced power to produce the power generation power 170.

In this case, in the power supply switching unit 610, the power generation input terminal 601 and the power output terminal 604 are electrically connected to each other, whereas the commercial power supply input terminal 602 and the power output terminal 604 are electrically connected. May be blocked.

Therefore, the generation power source 170 is the ship position control device 700 or the main pump 705 through the power supply switching unit 610 and the power output terminal 604 and the power supply network 180 of the voltage control device 600. Can be supplied and used.

On the other hand, the operation status management unit 630 of the voltage control device 600 checks the power consumption of the ship position control device 700 and the power usage of the main pump 705, and as a result of the check, the generation power source 170 controls the ship position. If it is determined that the required amount of the apparatus 700 or the main pump 705 is insufficient, the switching operation of the power supply switching unit 610 is controlled.

Accordingly, the power supply switching unit 610 electrically cuts the power generation input terminal 601 and the power output terminal 604, while the commercial power supply input terminal 602 and the power output terminal 604 are electrically connected. Can be.

Accordingly, the commercial power 620 may be stably supplied to the vessel position control apparatus 700 or the main pump 705.

As such, in the situation where the commercial power 620 is supplied, the power generation power 170 may be managed by the operation status management unit 630 such that the power generation power 170 is stored in the power storage unit 640.

In addition, the operation situation management unit 630, when the generation power 170 or the commercial power 620 is excessively introduced compared to the required amount of the vessel position control device 700 or the main pump 705, the power generation power ( 170 or part of the commercial power supply 620 may be controlled to be stored in the power storage unit 640.

On the other hand, according to another embodiment of the present invention, the vessel using the BOG in the vessel position control device may be a floating structure in the form of a filling station for filling the liquefied fuel gas, that is, a floating liquefied fuel gas filling station.

Floating liquefied fuel gas filling station does not simply discharge or consume BOG by using BOG in ship position control device when liquefied fuel gas is filled in a counter vessel or offshore structure that is floating at sea and uses liquefied fuel gas as fuel. Energy can be saved.

As described above, specific embodiments have been described in the detailed description of the present invention, but it is obvious that the technology of the present invention can be easily modified by those skilled in the art, and such modified embodiments are defined in the claims of the present invention. It will be included in the technical idea described.

100: vessel 101, 102: tank
103: manifold 150, 152: BOG line
151: bypass line 170: power generation
200: first compressor 200a: second compressor
300: BOG heater 400: power production device
500: BOG generator 600: voltage control device
610: power supply switching unit 620: commercial power
630: operation situation management unit 640: power storage unit
700: ship position control device 705: main pump

Claims (8)

BOG (Boil-Off Gas) line that provides the BOG's movement path from the tank,
A first compressor installed at the BOG line,
A BOG heater installed at the BOG line and disposed at a rear end of the first compressor,
A power production apparatus installed at the end of the BOG line at the output side of the BOG heater;
A BOG generator for generating power from the power generated by the power generator;
A voltage control device connected to an output side of the BOG generator and receiving the generated power and converting the generated power into used power;
A power supply network connected to a power output terminal of the voltage control device;
And a ship position control device installed on the ship as a power consumer connected to the power supply network.
Ship using BOG for ship position control device.
The method of claim 1,
The power consumption destination is,
It characterized in that it comprises a main pump or the voltage control device installed in the tank.
Ship using BOG for ship position control device.
The method of claim 1,
The power production device,
It is characterized in that any one of a diesel engine, a diesel fuel (Duel fuel) diesel engine, a gas turbine device, a steam boiler and a steam turbine device
Ship using BOG for ship position control device.
The method of claim 1,
The voltage control device,
Switching power supply having a power generation input terminal on the output side of the BOG generator, a commercial power input terminal configured separately from the power generation input terminal, a power storage terminal and a power output terminal, and a switching circuit for switching between terminals Containing wealth
Ship using BOG for ship position control device.
The method of claim 4, wherein
The voltage control device,
The power supply of the ship position control device and the power consumption of the main pump are checked and managed as a check value, and the power supply corresponding to the result of comparing the check value to a predetermined operation condition reference value for safe operation of the control object. It further comprises an operation status management unit for controlling the switching operation of the electrical switching circuit of the switching unit, converting any one of the commercial power in the ship and the generated power generated in the BOG generator to the power used to supply to the power consumer.
Ship using BOG for ship position control device.
The method of claim 5,
The voltage control device,
One or more charging cells and charging circuits for accumulating relatively small sized generation power to be used in a device requiring storage power when generating a relatively small amount of generated power to the BOG generator. Further comprising a power storage having a
Ship using BOG for ship position control device.
The method of claim 1,
The vessel,
A bypass line installed in the BOG line and bypassing the BOG;
Further comprising a second compressor installed in the bypass line
Ship using BOG for ship position control device.
8. The method according to any one of claims 1 to 7,
The vessel position control device,
A swivel propeller having an electric motor installed in the vessel and operated by electric power;
At least one inclination sensor installed on the vessel,
And a dynamic position control module for controlling the swing-type propeller to stably restore the attitude or balance of the vessel by analyzing the information received from the inclination sensor or the position adjustment information obtained through the satellite navigation device.
Ship using BOG for ship position control device.

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