JPS595229B2 - Vapor reflux device - Google Patents

Description

Detailed Description of the Invention: The present invention &i A device for recovering and processing evaporated gasoline (paper) in storage tanks installed at gas stations, etc., and returning only gasoline to the storage tank, especially a heat exchanger used for cooling the paper. Regarding the structure of

Gasoline naturally evaporates from the storage tank and is constantly released into the atmosphere, and especially when refueling from a tank truck, a large amount of gasoline is released, including the gasoline that had been accumulated in the tank.

Not only is vaporized gasoline, or paper, a waste of resources, but the hydrocarbons in paper are thought to contribute to photochemical smog.

For this reason, collecting paper is very beneficial in terms of both effective resource use and pollution prevention, but since the paper to be recovered is extremely flammable gasoline, it must be pressurized or Methods that cause reactions are dangerous, and there is a need for the development of safe collection methods.

As a recovery means that can meet such demands, it is conceivable to utilize the physical property that "gas becomes liquid when cooled."

This recovery means is highly safe because it does not pressurize or cause chemical reactions, but in order to efficiently return it to liquid gasoline, a low-cost heat exchanger with a good heat exchange rate is required.

Therefore, the present invention aims to provide a paper reflux device equipped with a heat exchanger that can efficiently cool paper and can be manufactured at low cost.

The paper reflux device 64 according to the present invention has a recovery circuit for evaporated gasoline generated from a storage tank and a cooling circuit as independent circuits, and a paper reflux device 64 is installed in a pipe body at a predetermined position of the recovery circuit that exchanges heat with the cooling circuit. It is characterized by the insertion of a heat exchanger filled with thermal globules.

The present invention will be described in detail below based on embodiments shown in the drawings.

In FIG. 1, 1 is a storage tank installed at a gas station or the like, and 2 is a ventilation pipe provided in this storage tack 1. The tank 1 is generally installed underground, and the ventilation pipe 2 protrudes above ground.

A partition plate 3 is arranged in the middle of this ventilation pipe 2 to divide the internal space into two.
・At the same time, the paper in the tank 1 is taken out from the storage tank 1 side and passed through the filter 4 to the primary cooler 5.
and the secondary cooler 6 in sequence.

The 56 primary coolers are for removing moisture, and the cooling temperature is set at about 5°C for each of the 6 primary coolers.

In addition, the secondary cooler 6Ll is used to return the gasoline in the paper to liquid and separate it from the air, and the cooling temperature Ll -
Set the temperature below 25°C.

Note that the partition plate 3 also serves as a mounting plate for piping, which will be described later.

7 is a primary cooler that separates the water droplets and moisture in the paper from the rest of the gas, 86 is a first auxiliary cook that receives water droplets, and 9 is a secondary cooler that separates the liquid from the remaining gas. This is a second auxiliary tank that stores gasoline (recovered gasoline) that has been returned to the air and is completely separated from air in the second gas-liquid separation section 21. It communicates with the storage tank 1 through a pipe 10 that passes through and faces into the storage tank 1.

That is, the pipe 1064 passes through the partition plate 3 and its lower end is located in the storage tank 1, and the other end (upper end) passes through the pipe wall of the ventilation pipe 2 and is connected to the discharge port of the second auxiliary cooker 9. Ru.

Further, the upper space of the ventilation pipe 2 and the air outlet of the second gas-liquid separation section 21 are connected by a connecting pipe.

On the other hand, 11 is a compressor, 12 is a radiator, 13 is a cooling fan, 14 is a pressure cushion tank, 156J is a first refrigerant distribution control valve, 16 is a first throttle valve (control valve), and 17 is a 1
a first temperature detector for detecting the cooling temperature of the secondary cooler 5;
8 is a second refrigerant flow side valve, 19 is a second throttle valve, and 20 is a second temperature detector that detects the cooling temperature of the secondary cooler 6; 5. Together with the secondary cooler 6, it constitutes a cooling circuit independent from the paper recovery circuit described above.

That is, as shown in FIGS. 2 and 3, the primary cooler 56' has a refrigerant tank 5a for storing a refrigerant such as Freon or liquid air, and an expansion chamber 5b in an integral structure, and the refrigerant tuck 5a is Heat exchanger 2 installed in the paper recovery circuit
2 and a first throttle valve 16 in the expansion chamber 5b.
It has a protruding spout 16a, a temperature sensing cylinder 17a of the first temperature detector 17, a pressure gauge connection port 21, etc.

Heat exchanger 22G Small balls made of a material with high thermal conductivity, for example, 8
The steel balls 22b are filled with steel balls 22b having a diameter of ~12 mm, and a blocking plate 22d having a small hole 22c is disposed at the outlet of the steel balls 22b.
The supporting cylinder 22ec! is configured to prevent movement of the supporting cylinder 22ec! : It is held between the inner peripheral surface of the cooker 5a.

The blocking plate 22cl is supported by a support rod 22f from the first gas-liquid separating section 7 side on the left side in the figure.

Further, the first refrigerant flow side leg valve 15 is opened and closed at required time intervals to supply refrigerant gas intermittently, and the time interval is determined by the detection output of the first temperature detector 17. The cooling temperature is automatically set to maintain the cooling temperature at around -5°C.

Note that a large number of through holes are provided in the lower peripheral wall of the support tube 22e to allow the refrigerant liquid to freely flow inside and outside the tube, and a liquid outlet 5c and a gas outlet 5d are provided at the bottom of the tank 5a.

The structure of such a cooler and the bactericidal control of the cooling temperature are substantially the same for the secondary cooler 6, except that the cooling temperature is set at -25°C or less.

Note that the compressor 11 may have a low pressure, but preferably has a large displacement, and mainly has a suction effect.

Next, the paper reflux function of the above device will be described.

First, in the cooling circuit, when the compressor 11 is operated, refrigerant gas is sucked into the compressor 11 from the refrigerant tacks 5a and 6a of the primary cooler 5 and the secondary cooler 6, and is discharged from there at a certain pressure (low pressure). and is cooled when passing through the radiator 12.

After cooling, it passes through the pressure cushion tank 14 to the first. It reaches the inlet side of the second refrigerant flow side leg valves 15 and 18, and each side leg valve 1
Due to the intermittent opening/closing operation of 5.18, the first. It is injected into the expansion chambers 5b, 6b via the second throttle valve 16.19.

This jetting causes adiabatic expansion, resulting in low temperature and low pressure, and the refrigerant liquid in the refrigerant cooks 5a, 6a becomes low temperature.

The temperature of this refrigerant liquid is the first. Second temperature sensor 17.20
The first temperature is detected according to the difference from the set temperature. The opening and closing time interval of the second leg valve 15.degree. 18 is adjusted.

Thereby, the cooling temperatures of the primary cooler 5 and the secondary cooler 6 are maintained at predetermined values.

On the other hand, the paper in the storage tank L is led out from the middle of the ventilation pipe 2 and flows into the primary cooler 5 via the filter 4.

In this primary cooler 5, the paper flows from the top to the bottom through the gap between the small balls 22b in the tube body 22a, and during this flow process, the paper is cooled by heat exchange with the low-temperature refrigerant liquid due to its large heat transfer area. ? The moisture in the jttiM gas becomes water droplets.

Since the FrL is passed through the paper 6J from above to below, 6J water will accumulate in the lower part (outlet side).

That is, the gas stays in the tube 22a for a longer time, but the liquid flows away to the bottom.

In this way, the liquid (paper) is sufficiently cooled and water is completely removed, and only the components that cannot be liquefied reach the outlet.

In this way, more efficient and complete liquefaction is achieved.

The water droplets are separated from the gas in the first gas-liquid separator 7 and drip into the first auxiliary tank 8, and only the gas flows into the secondary cooler 6.

This secondary cooler 6 also cools the paper in the same way as the primary cooler 5, but since the cooling temperature is low, the paper liquefies and vaporizes and is separated from the air, and the liquid gasoline is transferred to the second cooler 6. is stored in the auxiliary tack 9.

When the amount of recovered gasoline exceeds a certain level, the pipe 10
It is refluxed to storage tank 1 through .

Furthermore, the air after gasoline separation is discharged into the atmosphere through the vent pipe 2.

This emitted air contains almost no hydrocarbons.

In other words, no pressure is applied to the paper recovery circuit;
Furthermore, no chemical reaction using a catalyst is used, and the process and recovery are performed based solely on the relationship between temperature conditions and equilibrium vapor pressure.

In this case, the paper 6" small balls 2 filled in the tube body 22a
2b through the long path of a thin tube and return to water droplets and liquid gasoline, and only this gasoline is returned to the storage tank 1 with extremely high recovery efficiency, resulting in great economic savings. Effects can be obtained.

As described in detail above, the paper reflux device (1) according to the present invention is composed of a paper recovery circuit and a closed cycle cooling circuit, and the heat exchanger installed inside the cooler is constructed by filling small spheres in the tube. However, since the heat exchanger is processed and recovered based only on the relationship between temperature conditions and equilibrium vapor pressure, the production of the heat exchanger is simple and low cost, and the 6J heat exchange rate is high despite its small size.

Moreover, it has excellent safety and high recovery efficiency, which is very beneficial in terms of both effective use of resources and prevention of pollution.

Further, in the heat exchanger, the recovery circuit is arranged so that the paper flows from the top to the bottom, so that more efficient and complete liquefaction can be performed.

[Brief explanation of drawings]

The drawings show an embodiment of the paper reflux device according to the present invention, and FIG. 1 is an overall piping system diagram, and FIGS.
FIG. 61 is a plan view and a partially cutaway side view of the cooler. 1...Storage tank, 2...Vent pipe, 3
...Partition plate, 5...Primary cooler, 5a
... Refrigerant tank, 5b ... Expansion chamber, 6
...Secondary cooler, 7...First gas-liquid separation section, 8...First auxiliary tank, 9...
・Second auxiliary tank, 10...Piping, 11...
...Compressor, 12...Radiator, 15...
...First refrigerant 5rL flow control cape valve, 16...First throttle valve, 17...First temperature detector, 18
...Second refrigerant flow control valve, 19...
...Second throttle valve, 20...Second temperature detector, 21...Second gas-liquid separation section, 22...
・Heat exchanger, 22a...Pipe body, 22b...
...Small ball, 22c...Block plate.

Claims (1)

[Scope of Claims] 1. A recovery circuit for evaporated gasoline generated from a storage tank and a cooling circuit are independent circuits, and a heat conductive tube is installed in a pipe at a predetermined position of the recovery circuit that exchanges heat with the cooling circuit. A paper reflux device characterized by having a heat exchanger filled with small balls inserted therein. 2. The paper reflux device according to claim 1, wherein heat exchangers are inserted at two locations in the paper recovery circuit, and the cooling temperature is such that moisture is removed in the first stage and gasoline is liquefied in the second stage. 3. A recovery circuit for evaporated gasoline generated from a storage tank and a cooling circuit are made independent circuits, and a heat exchanger is inserted at a predetermined position in the recovery circuit that exchanges heat with the cooling circuit. A paper reflux device characterized in that a recovery circuit is arranged so that gasoline flows from above to below.