BG4291U1 - Gasoline vapor capture device for gas service stations - Google Patents

Abstract

The gasoline vapor capture device for gas service stations comprises a first activated carbon filter (1) and a second activated carbon filter (2) connected via a first inlet valve (1.1) and via a second inlet valve (2.1), respectively, and via a detonating fuse (9) with a vapor vent (10) at underground tanks of a gas service station. The first activated carbon filter (1) and the second activated carbon filter (2) are connected via a first vacuum valve (1.3) and via a second vacuum valve (2.3), respectively, to a vacuum pump (3) The vacuum pump (3) is connected to a first absorber (4), which is connected to a second absorber (5). The second absorber (5) is connected to the first inlet valve (1.1) and to the second inlet valve (2.1). The two absorbers (4) and (5) are connected via a petrol pump (7) and a three-way gas supply valve (7.1) to a buffer tank (6) equipped with a level transmitter (8). The buffer tank (6) is connected via a three-way gas return valve (6.1) as well as the three-way gas supply valve (7.1) to an underground gas station tank.

Description

Field of technique

The present utility model relates to a gas station gasoline vapor capture facility that will find application in the purification of waste gases from volatile organic compounds, and in particular in the recovery of vapors during filling of the underground gasoline tank at gas stations, as and the money from incomplete balancing between the car and the underground tank.

Prior art

Volatile organic compounds release a photochemical oxidant by reacting with nitrogen oxides in the presence of sunlight. Their sources are many and varied: thermal processes, use of organic solvents, transport and processing of liquid fuels and light organic compounds, refineries and others. Some volatile organic compounds are known to be highly toxic, mutagenic and carcinogenic.

Volatile petroleum products, such as gasoline, emit money during storage, transportation, loading or unloading. Before the introduction of gasoline vapor capture systems, these vapors were released into the atmosphere. Gasoline fumes emitted when refueling motor vehicles are harmful to human health and the environment. All gas stations must be equipped with a system to capture gasoline vapors in order to achieve cleaner air. In such systems known in practice, gasoline vapors are transferred to the tank of the gas station or returned to the gas station for resale.

The filling guns are designed so that while filling the cars, they extract the gasoline vapors back. Subsequently, when the gas station tank is filled, at the same time, in the opposite direction, the vapor in it is supplied to the tanker via the so-called gas phase hose. The money from the tankers is taken to the oil base, where it is used, thanks to gasoline vapor liquefaction systems.

Known systems cannot achieve better than 65 to 70% vapor recovery efficiency, and therefore pollutes the environment during filling of the underground tank with gasoline.

Technical nature of the utility model

The task of the utility model is to create a gasoline vapor capture facility at gas stations that is automated and provides both efficient capture of gasoline vapors during filling of the underground gasoline tank and reduced environmental pollution.

The task was solved by creating a gasoline vapor capture facility at gas stations, which includes a first activated carbon filter and a second activated carbon filter connected through a first inlet valve and a second inlet valve, respectively, and through a detonation guard with a vent for steam on underground tanks at a gas station. The first activated carbon filter and the second activated carbon filter are connected by a first vacuum valve and a second vacuum valve to a vacuum pump, respectively. The vacuum pump is connected to a first absorber which is connected to a second absorber. The second absorber is connected to the first inlet valve and to the second inlet valve of the activated carbon filters. The two absorbers are connected to a buffer tank equipped with a level transmitter through a gasoline pump and a three-way valve for gasoline supply. The buffer tank through a return valve for gasoline, as well as a three-way valve for the supply of gasoline, are connected to an underground tank of the gas station. The first activated carbon filter and the second activated carbon filter are connected via a first outlet valve and a second outlet valve to a fresh air outlet line, respectively.

An advantage of the created facility is that it provides effective capture of gasoline vapors during the filling of the underground tank with gasoline with an optimized process regeneration time and with the ability to accurately measure the amount of recovered product.

Explanation of the attached figure

The present utility model is illustrated in the attached Figure 1, which is a schematic diagram of a gas station gasoline vapor capture facility, according to the utility model.

Examples of implementation of the utility model

The designed gas station gasoline vapor capture facility, shown in Figure 1, is installed on a flat concrete base near the underground storage tanks. Its steam inlet connects to the existing steam vent of the underground tanks. The steam vent must be equipped with a vacuum valve to release the pressure.

The created facility includes a first filter with activated carbon 1 and a second filter with activated carbon 2, connected respectively through a first inlet valve 1.1 and through a second inlet valve 2.1, and through a detonation guard 9 with a steam vent 10 of underground tanks of a gas station. The detonation guard 9 at the entrance isolates the created facility from the storage tanks.

The first activated carbon filter 1 and the second activated carbon filter 2 are connected, respectively, through a first vacuum valve 1.3 and through a second vacuum valve 2.3 to a vacuum pump 3. The vacuum pump 3 is connected to a first absorber 4, which is connected to a second absorber 5. The second absorber 5 is connected to the first inlet valve 1.1 and to the second inlet valve 2.1 of the activated carbon filters 1 and 2. The two absorbers 4 and 5 through a gasoline pump 7 and a three-way gasoline supply valve 7.1 are connected to a buffer tank 6 equipped with level transmitter 8. The function of buffer tank 6 is dosing of the regenerated product. The buffer tank 6 is equipped with an overflow plate and a measuring chamber with a level transmitter 8 for measuring the level. The difference in level between the start and end of the regeneration cycle indicates the amount of product regenerated during one cycle. The buffer tank 6 through the return valve for gasoline 6.1, as well as the three-way valve for the supply of gasoline 7.1, are connected to an underground tank of the gas station.

The first activated carbon filter 1 and the second activated carbon filter 2 are connected, respectively, through a first outlet valve 1.2 and a second outlet valve 2.2 with an outlet pipe for fresh air.

The created facility for capturing gasoline vapors at gas stations is used in the following way.

In the standby mode, the first inlet valve 1.1 and the first outlet valve 1.2 are open as the gasoline vapor passes through the first activated carbon filter 1. After the process of unloading a gasoline truck, the facility is manually started. The activated carbon bed of the second activated carbon filter 2 is also switched. The second inlet valve 2.1 and the second outlet valve 2.2 are opened. The vacuum pump 3 is started and the first inlet valve 1.1 and the first outlet valve 1.2 are closed. The gasoline pump 7 is started and the first vacuum valve 1.3 is opened to start the regeneration of the first activated carbon filter 1.

The highly concentrated vapors are sucked by the first activated carbon filter 1 with the vacuum pump 3 to be reabsorbed in the columns of the two absorbers 4 and 5 by a counterflow of gasoline pumped from the buffer tank 6 through the gasoline pump 7 and the three-way gasoline supply valve 7.1. The poor absorbent is returned directly to the buffer tank 6 through the gasoline return valve 6.1. After regeneration, the activated carbon layers of the first activated carbon filter 1 are replaced and the regeneration continues through the second activated carbon filter 2, for which the second inlet valve 2.1 and the second outlet valve 2.2 are closed, and the second vacuum valve 2.3 is opened.

The return of the absorbent from the buffer tank 6 is carried out on a return line to the underground storage through the return valve for gasoline 6.1. During the regeneration cycle, the absorbent volume increases. Excess absorbent passes through the overflow plate and accumulates in the measuring chamber. The difference in level between the start and end of the regeneration cycle is measured by the level transmitter 8 and indicates the amount of regenerated product. After each regeneration cycle, the absorbent must be refreshed.

The facility is protected from overflow by a pipe connected directly to the underground storage. The facility is fully automated and shuts down automatically in the event of a malfunction.

Claims (1)

A device for capturing gasoline vapors at filling stations, characterized in that it includes a first activated carbon filter (1) and a second activated carbon filter (2), connected respectively by a first inlet valve (1.1) and a second inlet valve (2.1 ), and through a detonation guard (9) with a steam vent (10) of underground tanks at a gas station, where the first activated carbon filter (1) and the second activated carbon filter (2) are connected respectively through a first vacuum valve ( 1.3) and through a second vacuum valve (2.3) with a vacuum pump (3) which is connected to a first absorber (4) connected to a second absorber (5) which second absorber (5) is connected to the first inlet valve (1.1) and with the second inlet valve (2.1) of the activated carbon filters (1) and (2), with the absorbers (4) and (5) through a gasoline pump (7) and a three-way gasoline supply valve (7.1) connected to a buffer tank (6) equipped with a level transmitter (8), in which both the buffer tank (6) through a return valve for gasoline (6.1) and the three-way gasoline supply valve (7.1) are connected to an underground tank of the gas station, and the first activated carbon filter (1) and the second activated carbon filter (2) are connected respectively through a first outlet valve ( 1.2) and through a second outlet valve (2.2) with an outlet pipe for fresh air