JPS595230B2 - Vapor reflux device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for recovering evaporated gasoline (paper) from a storage tank installed at a gas station or the like and returning only the gasoline to the storage tank.

Gasoline naturally evaporates from the storage tank and is constantly released into the atmosphere.

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

Therefore, collecting paper is very beneficial in terms of both effective use of resources and prevention of pollution.

In particular, when refilling gasoline from a tank truck to a storage tank, a large amount of paper is released, including what had accumulated in the tank, so the effect will be even more noticeable if paper is completely recovered during refueling. become.

In view of the above-mentioned points, an object of the present invention is to provide a paper reflux device that can reliably recover paper as liquid gasoline not only during normal times but also at specific times such as during refueling.

The gist of the invention to achieve the above object is that a recovery circuit for evaporated gasoline generated from a storage tank includes a first cooler for moisture removal, a second cooler for gasoline separation, and a second cooler for separating gasoline at a specific time. The third cooler is provided to cool the gas after it has been cooled by the cooler.

The present invention will be described in detail below with reference to the accompanying drawings.

In Figure 1, 1 is a primary cooler that introduces and cools the paper generated in the storage tank, 2 is a secondary cooler, and the primary cooler 1 is for removing moisture. Set the temperature to about -5℃.

Further, the secondary cooler 2 is used to cool the gas separated into water droplets in the first gas-liquid separator 3 after water removal in the primary cooler 1 and return it to liquid gasoline, and the cooling temperature is 12
Set the temperature below 5℃.

4 is a second gas-liquid separation section that separates liquid gasoline and air; 5 is a three-way valve; 6 is a cooling regenerator; 7 is a third gas-liquid separation section; It is inserted into an air flow pipe 8 that communicates with the air outlet of the gas-liquid separation section 4, one outlet of which communicates with the atmosphere, and the other outlet of which is connected to the paper tube of the cooling regenerator 6.

The paper part of the cooling regenerator 6 communicates with the inlet of the third gas-liquid separation section 7 via a heat exchanger to be described later, and the recovered gasoline is returned to the storage tank through a pipe 9, and the air is passed through a valve 10 in the middle. It is discharged into the atmosphere through an exhaust pipe 11 having a diameter.

On the other hand, 12 is a first refrigerant flow control valve disposed in the refrigerant gas flow path, and 13 is a second refrigerant flow control valve. The second control valves 12 and 13 open and close at certain time intervals to intermittently supply refrigerant gas.

1st. The opening/closing time interval of the second control valves 12 and 13 is changed according to the cooling temperature of the primary and secondary coolers 1 and 2, and the cooling temperature is always maintained at a predetermined temperature.

That is, the configuration is such that the temperature is controlled by adjusting the interval of injection into the expansion chamber of the cooler using the throttle valve.

Reference numeral 14 denotes a valve disposed near the refrigerant gas inlet of the cooling regenerator 6, which is normally open and closed when the cooling regenerator 6 is not required or when the operation is stopped.

In addition, the primary cooler 1, the secondary cooler 2, and the cooling regenerator 6
The refrigerant gas outlet of is connected to the suction port of a compressor (not shown).

The compressor may have a low pressure, but it is desirable to have a large displacement, and its main function is suction.

The refrigerant gas discharged from the discharge port of the compressor is cooled as it passes through the heater, and is brought to the required temperature and pressure as described above in the first paragraph. Second
It is supplied to the control valves 12, 13 and 14, forming a so-called closed cycle cooling circuit.

As shown in FIG. 2, the primary cooler 1 includes a refrigerant tank 1a for storing a refrigerant such as freon or liquid air, and an expansion chamber 1.
A heat exchanger 20 is installed in the tank 1a to be inserted into the paper recovery circuit, and an expansion chamber 1 is integrated with the tank 1a.
It has a configuration in which a throttle valve (nozzle) 21 is protruded from b.

This also applies to the secondary cooler.

3 and 4 show the structure of the cooling regenerator 6. FIG.

That is, the inner tank 6c is installed inside the outer tank 6a via the support stand 6b, and the space between the placed tanks 6a and 6c is evacuated to form a so-called vacuum insulation tank, and a spiral heat is generated inside the inner tank 6c. A refrigerant reservoir vibrof installed vertically in the exchanger 6d and the annular refrigerant gas distribution pipe 6e.
It is also filled with 6g of antifreeze.

The inlet of the refrigerant gas flow pipe 6e is connected to the valve 14, and the outlet is connected to the suction port of the compressor.

On the other hand, the heat exchanger 6d has an upper end connected to the other outlet of the three-way valve 5 outside the outer tank a through a paper inflow pipe 6h, a safety valve 61 installed in the middle, and a lower end connected to the outside of the tank 6a. It is pulled out and connected to the third gas-liquid separation section 7.

Note that 6j is an antifreeze inflow pipe, 6 is an antifreeze discharge pipe, and 61 is an antifreeze inflow pipe.
is a vacuum exhaust port, and 6m is a vacuum valve.

Next, the paper reflux effect by the above device will be described.

First, paper, which is always generated in the storage tank under normal conditions, is introduced into the primary cooler 1 and cooled down as it passes through the heat exchanger 20, and the moisture in the paper becomes water droplets.
is removed in the gas-liquid separation section 3.

The paper after moisture removal is introduced into the secondary cooler 2, where it is returned to liquid gasoline, where the gasoline is separated from air in the second gas-liquid separation section 4, and then returned to the storage tank via piping 9. .

In this state, the outlet of the three-way valve 5 on the atmosphere side is open, and the separated air is discharged to the atmosphere through the three-way valve 5.

This discharged air has a paper amount in the primary and secondary coolers 1,
Since the processing capacity is less than the processing capacity of 2, it contains almost no hydrocarbons and is effective in preventing pollution.

In this way, even while the paper recovery process is being performed by the primary and secondary coolers 1 and 2, the refrigerant gas flows through the refrigerant gas distribution pipe 6e of the cooling regenerator 6 at its inlet and joins in half-frequency waves. Adiabatic expansion occurs in the liquid reservoir vibro f, and a small portion of the refrigerant gas is liquefied and stored in the vibro f, and the temperature gradually decreases.

Since the normal state continues for a considerable period of time, the temperature becomes low enough to liquefy antifreeze or gasoline due to cooling by liquefaction of the refrigerant gas, and the low temperature is maintained by the action of the insulation tank.

When this condition occurs, a tank truck is placed in the storage tank.
When refueling from the tank, the outlet of the three-way valve 5 on the cooling regenerator side is opened.

As a result, air separated from gasoline by cooling in the secondary cooler 2 is introduced into the cooling regenerator 6 via the three-way valve 5, and flows through the heat exchanger 6d.

At this time, it will be cooled with 6g of low-temperature antifreeze.

When refueling from a tank truck, a large amount of paper is
Since the gasoline is introduced into the secondary cooler 1 and the secondary cooler 2, it becomes impossible for the secondary cooler 2 to return all of the gasoline to a liquid state, and the gas from the second gas-liquid separation section 4 contains gasoline. It will be done.

This amount is cooled in the cooling regenerator 6 and returned to liquid gasoline, separated from air in the third gas-liquid separator 7, and returned to the storage tank.

Therefore, most of the paper is recovered as liquid gasoline and air pollution is prevented.

Moreover, since it is used only during a specific period, if a cold storage structure is used, supplementary cooling power is sufficient, increasing the operating rate of the device.

Although a three-way valve is used in the above embodiment, a switching circuit may be constructed by combining a plurality of valves.

As described in detail above, according to the present invention, a three-stage cooler is provided, and paper recovery processing is normally performed by the previous two-stage cooler, and only at specific times such as during refueling, the third stage cooler is used. Since paper is added to the collection process, paper can always be reliably collected, which is very beneficial in terms of both effective use of resources and prevention of pollution.

Moreover, since the third stage utilizes the auxiliary cooling power in the refrigerant gas flow path, it can be processed at low cost, and when combined with gasoline recovery, it can be expected to have significant economic effects. be.

[Brief explanation of the drawing]

The drawings show an embodiment of the paper reflux device according to the present invention, in which Fig. 1 is a piping system diagram, Fig. 2 is a schematic configuration diagram of a cooler, and Figs. 3 and 4 show a cooling regenerator therein. FIG. 6 is a plan view and a side view showing the outer tank in a cutaway state. 1...Primary cooler, 2...Secondary cooler, 3...First gas-liquid separation section, 4...Second gas Liquid separation section, 5... Three-way valve, 6...
・Cooling regenerator.

Claims (1)

[Claims] 1. A recovery circuit for evaporated gasoline generated from a storage tank includes a first cooler for moisture removal, a second cooler for gasoline separation, and cooling by the second cooler at a specific time. A paper reflux device characterized in that a third cooler is provided to cool the subsequent gas. 2 A switching valve is provided in the gas flow path after cooling by the second cooler to select whether to communicate with the atmosphere or with a third cooler, and normally the switching valve is switched to the atmosphere side. 2. The paper reflux device according to claim 1, wherein the paper reflux device is configured to switch to the third cooler side when the storage tank is refilled with gasoline. 3 Claims in which a liquid reservoir is provided in the flow path of the refrigerant gas, and a portion of this liquid reservoir is housed in a container with an insulating structure together with an antifreeze liquid and a heat exchanger through which the gas body passes through the second cooler. The paper reflux device according to item 1 or 2.