Oiling machine with fuel vapor recovery function and fuel vapor recovery method

Abstract

The invention discloses an oiling machine with a fuel steam recovery function and a fuel steam recovery method. The oiling machine mainly solves the technical problems that existing fuel steam recovery processing is high in safety risk and processing cost. Fuel steam is recycled through condensation and membrane separation processes, the fuel steam is compressed by the steam pressurizing unit and then directly conveyed to the cooling unit with a certain distance to be subjected to heat exchange and cooling, and after a cooled gas-liquid mixture is correspondingly separated by the gas-liquid separation assembly, liquefied gasoline is recycled. After the residual fuel steam is further separated by adopting a membrane separation assembly, the fuel steam is dissolved and permeated in a membrane material and conveyed to a pressurizing compressor to be recycled, and air molecules serve as tail gas to be directly discharged or connected into the system again to participate in circulation, so that the working safety is ensured; and the membrane separation assembly and the gas-liquid separation assembly do not need to be cooled, the cooling process can be greatly simplified, the refrigeration efficiency is high, and the production cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel dispensers, and particularly to a fuel dispenser with fuel vapor recovery and a fuel vapor recovery method. Background Art

[0002] During the process of a fuel dispenser supplying highly volatile fuel (such as gasoline) to a fuel tank of a vehicle or the like, fuel vapor corresponding to the fuel supply amount will flow out of the fuel tank. Fuel vapor is a volatile gaseous hydrocarbon mainly composed of light hydrocarbons. When fuel vapor is directly discharged into the atmosphere, it will not only cause waste of fuel resources, but also pose safety risks such as fire and explosion, and will pollute the atmospheric environment. Therefore, it is necessary to recover and process the fuel vapor.

[0003] A fuel vapor treatment method known to the inventors is that when the fuel dispenser supplies fuel, the fuel vapor discharged from the fuel tank of a refueling vehicle or the like is cooled and recovered at the same time. After the fuel vapor is cooled, the liquefied fuel is reused, and the unliquefied fuel vapor is adsorbed on the surface of the adsorbent, and the remaining gas is diluted and discharged into the atmosphere. After the adsorbent is saturated, the fuel vapor is desorbed from the adsorbent, and the desorbed fuel vapor is cooled and then recovered and reused.

[0004] However, in the process of implementing the technical solution in the embodiments of the present application, the inventors found that although the above adsorption method can solve the problem of fuel vapor emission to a certain extent, there are at least the following technical problems: the adsorption agent used in the adsorption method has a short service life, and a large amount of the adsorption agent will be lost during the frequent adsorption and desorption processes, resulting in a continuous decline in its adsorption efficiency. There may be problems such as the failure of the adsorption agent, and it is impossible to ensure that the concentration of the discharged fuel vapor is below the lower explosion limit of gasoline, posing a great safety hazard; in addition, after the adsorption agent exceeds the standard, it needs to be replaced, and the scrapped adsorption agent belongs to hazardous waste, and the treatment cost is relatively high.

[0005] The information disclosed in this background art section is only for enhancing the understanding of the background art of the present disclosure, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0006] In view of at least one of the above technical problems, the present disclosure provides a fuel dispenser with fuel vapor recovery and a fuel vapor recovery method, mainly solving the technical problems of high safety risk and high treatment cost in the existing fuel vapor recovery and treatment.

[0007] According to one aspect of the present disclosure, a fuel dispenser with fuel vapor recovery is provided, which includes a fuel filling module corresponding to and communicating with a fuel storage tank and provided with an oil and gas recovery oil gun, and a vapor recovery module for recovering fuel vapor at the fuel tank being filled and corresponding to and communicating with the oil and gas recovery oil gun; the vapor recovery module includes a vapor pressurizing unit, a vapor cooling unit, and a gas-liquid separation unit connected in sequence from upstream to downstream; the gas-liquid separation unit includes a gas-liquid separation assembly and a membrane separation assembly corresponding to and communicating with the exhaust port of the gas-liquid separation assembly and used for separating oil liquid in the input gas; the vapor pressurizing unit, the gas-liquid separation unit, and the vapor cooling unit are vertically arranged on one side of the fuel dispenser from bottom to top.

[0008] In some embodiments of the present disclosure, the vapor pressurizing unit includes a pressurizing compressor. The intake port of the pressurizing compressor is correspondingly communicated with the oil and gas recovery oil gun through a vapor return pipe. The gas return port of the pressurizing compressor is correspondingly communicated with the fuel vapor outlet of the membrane separation assembly through a return pipe. The outlet port of the pressurizing compressor is correspondingly communicated to the vapor cooling unit.

[0009] In some embodiments of the present disclosure, the vapor cooling unit includes a refrigeration compressor, a heat exchanger, a dryer, an expansion valve, and an evaporator for cooling and heat exchanging fuel vapor, which are connected in series to form a loop. A refrigerant is correspondingly filled in this loop.

[0010] In some embodiments of the present disclosure, a ventilation window is provided at the fuel dispenser housing corresponding to the vapor cooling unit; the vapor cooling unit further includes a heat exchange fan for purging the heat exchanger for heat exchange.

[0011] In some embodiments of the present disclosure, the gas-liquid separation assembly includes a liquid level sensor. The drain port of the gas-liquid separation assembly is correspondingly communicated to the fuel storage tank or the inlet of the fuel filling module through a return pipe connected in series with a return liquid valve.

[0012] In some embodiments of the present disclosure, the membrane separation assembly includes a gas separation membrane in a cylindrical shape for separating air molecules and oil liquid molecules. A concentration meter for detecting the tail gas concentration value is provided at the exhaust port of the membrane separation assembly.

[0013] In some embodiments of the present disclosure, the exhaust port of the membrane separation assembly is correspondingly open and communicated to the atmosphere, or communicated to the gas passage of the fuel supply pump in the fuel filling module, or communicated to the vent pipe or the oil and gas recovery pipe of the fuel storage tank.

[0014] In some embodiments of the present disclosure, horizontal explosion-proof partitions are correspondingly provided between the vapor pressurizing unit, the vapor cooling unit, and the gas-liquid separation unit. Cable holes for maintaining airtightness cable clamps are correspondingly opened at the horizontal explosion-proof partitions.

[0015] According to another aspect of the present disclosure, there is provided a method for recovering fuel vapor, which is implemented based on the fuel dispenser with fuel vapor recovery as described above, and includes the following steps: (1) The temperature transmitter in the vapor cooling unit is used to monitor in real time whether the temperature in the evaporator of the unit is within the range of 0 to 5°C. If it is higher than this temperature range, the start of the fuel filling module is interlocked and restricted, and the vapor cooling unit is started to cool until the temperature of the evaporator drops to within the range of 0 to 5°C, and then the start restriction of the fuel filling module is released accordingly; (2) When there is a filling demand, the fuel filling module is started to start filling fuel into the fuel tank to be filled, and at the same time, the pressurizing compressor in the vapor pressurizing unit is started to pressurize and transport the fuel vapor generated by the fuel tank to be filled and fuel filling to the vapor cooling unit for heat exchange; (3) After cooling, the fuel vapor doped with liquefied gasoline is transported to the gas-liquid separation unit for gas-liquid separation. The liquefied gasoline is separated from the fuel vapor through the gas-liquid separation component and then flows back to the fuel storage tank or the inlet of the fuel filling module correspondingly; the fuel vapor enters the membrane separation component and air molecules are separated correspondingly under the negative pressure formed by the suction of the pressurizing compressor; and the air molecules are discharged after being detected by the concentration meter. When the monitoring value of the concentration meter exceeds the set value, the fuel filling module and the vapor pressurizing unit are interlocked and controlled to be closed; (4) After the filling is completed, the fuel filling module and the vapor pressurizing unit are closed, and the process returns to step (1).

[0016] One or more technical solutions provided in the embodiments of the present application have at least any one of the following technical effects or advantages: The recovery and utilization of fuel vapor are realized through the condensation and membrane separation processes. After the fuel vapor is compressed by the vapor pressurizing unit, it is directly transported to a cooling unit at a certain distance for heat exchange and cooling. After the cooled gas-liquid mixture is separated by the gas-liquid separation component correspondingly, the liquefied gasoline is recovered and utilized, and the remaining fuel vapor is further separated by the membrane separation component. The fuel vapor dissolves and penetrates in the membrane material and is transported to the pressurizing compressor for recycling, while the air molecules are directly discharged as tail gas or reconnected to the system to participate in the cycle to ensure work safety; and the membrane separation component and the gas-liquid separation component do not need to be cooled, which can greatly simplify the cooling process, with high refrigeration efficiency and low production cost. In addition, through the reasonable layout of the vapor recovery module, the construction cost and equipment cost investment during station establishment can be reduced, and the equipment integration degree, processing efficiency and safety effect are high. Description of the Drawings

[0017] Figure 1 It is a front view of a fuel dispenser in an embodiment of the present disclosure.

[0018] Figure 2This is the structural schematic diagram of a fuel dispenser in an embodiment of the present disclosure.

[0019] Figure 3 This is a schematic diagram of a partial internal structure of a fuel dispenser in another embodiment of the present disclosure; In the above figures, A is a fuel filling module, B is a vapor recovery module, 10 is a fuel storage tank, 11 is a fuel supply pipeline, 12 is an oil and gas recovery oil gun, 13 is a fuel supply pump, 14 is an oil flowmeter, 2 is a vapor pressurizing unit, 21 is a vapor return pipe, 22 is a pressurizing compressor, 3 is a vapor cooling unit, 31 is a refrigeration compressor, 32 is a heat exchanger, 33 is a dryer, 34 is an expansion valve, 35 is an evaporator, 36 is a heat exchange fan, 37 is a ventilation window, 4 is a gas-liquid separation unit, 41 is a gas-liquid separation component, 42 is a return oil pipe, 43 is a return liquid valve, 44 is a membrane separation component, 45 is a return gas pipe, and 46 is a concentration meter. Detailed implementation manners

[0020] In the description of the present disclosure, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. For the "connection" and "coupling" involved in the present application, unless otherwise specified, both include direct and indirect connections (couplings).

[0021] The programs involved or relied on in the following embodiments are all conventional programs or simple programs in the technical field, and those skilled in the art can make conventional selections or adaptive adjustments according to specific application scenarios.

[0022] The devices, etc. involved in the following embodiments are all conventional commercially available products unless otherwise specified.

[0023] To better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the specification drawings and specific implementation manners.

[0024] To solve the problems that in the prior art, when using the conventional adsorption method for fuel vapor recovery, the recovery safety and cost are relatively high, and the existing recovery system needs to set up a separate station, with high construction and site costs, complex system structure and low integration, etc., this example discloses a fuel dispenser with fuel vapor recovery. See Figure 1, which includes a fuel filling module A and a vapor recovery module B. By organically combining the fuel filling module A and the vapor recovery module B, while reducing the complexity of the recovery system, the integration degree is improved. At the same time, the laying of recovery pipelines and the like can be reduced, greatly improving the convenience of station construction and construction costs. Moreover, because the laying length of the vapor recovery pipeline can be greatly reduced, the fuel vapor treatment efficiency and safety level are relatively high.

[0025] Specifically, refer to Figure 2 , the fuel filling module A is used to meet the fuel filling needs of the vehicle to be filled. It is connected to the oil outlet of the in-station fuel storage tank 10 through the fuel supply pipeline 11 to obtain oil from the fuel storage tank; the other end of the fuel supply pipeline is connected with at least one oil and gas recovery oil gun 12 with oil and gas recovery through a parallel branch. In this example, the oil gun is connected to the corresponding branch through a rubber hose, and fuel filling is realized by this fueling gun. In order to realize the extraction of oil from the fuel storage tank 10 and the metering function of the fuel dispenser, in this example, a fuel supply pump 13 and an oil flow meter 14 are connected in series in the fuel supply pipeline 11. The oil is sucked through the fuel supply pump and the accurate metering of the oil filling volume is realized through the oil flow meter 14.

[0026] Among them, in order to collect fuel vapor, the oil and gas recovery oil gun is connected to the vapor recovery module B through the vapor return pipe 21. The vapor return pipe 21 is specifically connected to the gas recovery port of the oil and gas recovery oil gun. Thus, during fuel filling, the vapor generated by fuel supply and the fuel vapor in the vehicle fuel tank are entered into the vapor return pipe 21 through the gas recovery port of the oil and gas recovery oil gun, and are correspondingly input into the vapor recovery module B for recovery and treatment by the vapor recovery module B.

[0027] Refer to Figure 2 , in this embodiment, the vapor recovery module B includes a vapor pressurizing unit 2, a vapor cooling unit 3, and a gas-liquid separation unit 4 that are sequentially connected to the downstream of the vapor return pipe 21; among them, the vapor pressurizing unit 2 is used to pressurize the vapor and drive the fuel vapor to be transported downstream along the pipeline; the vapor cooling unit 3 is used to cool the fuel vapor so that the fuel vapor can be liquefied as much as possible; the gas-liquid separation unit 4 is used to separate the gas-liquid mixture doped with oil in the fuel vapor and further recover the separated gas to ensure the full utilization of the fuel vapor and ensure that the discharged gas after separation meets the corresponding emission standards.

[0028] Specifically, refer to Figure 2, to achieve the pressurization treatment of the fuel vapor in the vapor return pipe, in this embodiment, the vapor pressurization unit includes a pressurization compressor 22. The intake port of the compressor is connected to the vapor return pipe 21 for inputting the vapor generated by the fuel supply obtained at the vapor recovery oil gun 12 and the fuel vapor in the vehicle fuel filling tank. After the fuel vapor enters the pressurization compressor 22 and the pressure is increased, it enters the vapor cooling unit 3 through the cooling pipeline connected to the outlet of the pressurization compressor 22 for cooling treatment.

[0029] See Figure 2 , in this embodiment, to achieve the cooling and temperature reduction of the fuel vapor in the cooling pipeline, the vapor cooling unit 3 includes a cooling loop for heat exchange with the cooling pipeline. A refrigeration compressor 31, a heat exchanger 32, a dryer 33, an expansion valve 34, and an evaporator 35 are sequentially connected in series in the loop, and the loop is filled with a refrigerant. Through the gas-liquid change of the refrigerant, the heat in the fuel vapor is taken away to achieve the purpose of cooling the fuel vapor. Specifically, when the vapor cooling unit 3 works, the refrigeration compressor 31 in the cooling loop is started. After the refrigeration compressor 31 starts running, it compresses the low-pressure gaseous refrigerant in the cooling loop, converting it into a high-pressure gaseous refrigerant. Driven by the pressure, the high-pressure gaseous refrigerant circulates along the cooling loop to the heat exchanger 32, where heat exchange occurs, so that the high-pressure gaseous refrigerant condenses into a high-pressure liquid refrigerant. Further, the high-pressure liquid refrigerant enters the dryer 33 along the cooling loop and is converted into a low-pressure gaseous refrigerant through the expansion valve 34 and transported to the evaporator 35 for heat exchange. In this example, the evaporator 35 is respectively connected to the cooling loop and the cooling pipeline for transporting the fuel vapor, and the media in the two pipelines in the evaporator 35 are independent of each other and only heat exchange occurs. Through the cold quantity of the low-pressure gaseous refrigerant, the fuel vapor is cooled and liquefied, and the low-pressure gaseous refrigerant that has participated in the heat exchange at the evaporator 35 then continues to enter the refrigeration compressor along the cooling loop to repeat the above cycle, carrying the heat in the fuel vapor to the heat exchanger 32 for release. Among them, in this embodiment, in order to facilitate the discharge of heat at the heat exchanger 32, a heat exchange fan 36 is provided at the heat exchanger in this example. The heat exchange fan 36 blows the surface of the heat exchanger 32 to take away the heat at the heat exchanger 32 and discharge it into the surrounding atmosphere. Correspondingly, see Figure 1 , a ventilation window 37 is provided at the corresponding position of the heat exchanger 32 on the housing of the fuel dispenser vapor recovery module, so as to facilitate the heat at the heat exchanger 32 to be blown and discharged by the heat exchange fan 36, prevent heat from accumulating in the cooling unit, and ensure efficient cooling efficiency.

[0030] However, considering that the cooling capacity supply of the vapor cooling unit 3 requires a certain process and cannot reach the set cooling temperature instantaneously, and the fuel filling demand has a certain randomness, in order to ensure the cooling effect of the vapor cooling unit, in this embodiment, a temperature transmitter communicatively connected to the control unit is provided at the evaporator 35 to detect whether the temperature in the evaporator 35 meets the set cooling temperature, so as to start working when the vapor cooling unit is higher than the set cooling temperature. In addition, to avoid the situation that the vapor cooling unit does not reach the preset cooling temperature during fuel supply and filling, in this example, the power supplies of the fuel filling module A and the vapor recovery module B are independent of each other, so that when the fuel filling module A cuts off the power supply without filling demand, it can ensure that the vapor cooling unit can always work normally.

[0031] After the fuel vapor is cooled by the vapor cooling unit 3 and partially liquefied, a gas-liquid separation unit 4 is provided to separate the gasoline generated after liquefaction from the unliquefied fuel vapor. Specifically, refer to Figure 2 , the gas-liquid separation unit 4 includes a gas-liquid separation component 41. The fuel vapor mixed with liquefied fuel after being cooled by the evaporator 35 is transported to the gas-liquid separation component 41 through a cooling pipeline. In the gas-liquid separation component 41, the liquefied fuel settles at the bottom of the gas-liquid separation component 41, while the fuel vapor is in the upper part of the gas-liquid separation component 41. Among them, in order to recover the liquefied fuel, the drain port at the bottom of the gas-liquid separation component 41 is connected to the inlet of the supply pump 13 through a return oil pipe 42, and a return liquid valve 43 is connected in series in the return oil pipe 42 to control the on-off of the return oil pipe 42. In this embodiment, in order to ensure the orderliness and safety of the recovery system, a liquid level sensor for measuring the liquid level height in the gas-liquid separation component 41 is provided. When the liquid level sensor detects that the liquid level in the gas-liquid separation component 41 reaches the set liquid level height, the control unit correspondingly controls the return liquid valve 43 in the return oil pipe 42 to conduct, and the liquefied fuel is transported to the inlet of the fuel supply pump or the fuel storage tank through the return oil pipe. In this example, the return oil pipe 42 is correspondingly connected to the inlet of the fuel supply pump 13, so that the recovered fuel can be directly filled and used.

[0032] Since the fuel vapor and air in the upper part of the gas-liquid separation component 41 contain a certain volume of fuel and do not meet the safety and environmental protection emission standards and cannot be directly discharged, in this embodiment, the fuel vapor and air in the upper part of the gas-liquid separation component 41 are transported to the membrane separation component 44 for further separation treatment. Specifically, the gas-liquid separation component 41 includes a cylindrical gas separation membrane, and the gas separation membrane realizes the separation effect through the difference characteristics of the dissolution and diffusion rates of organic gases and each component of air in the membrane material. The exhaust port of the gas-liquid separation component 41 is communicated with the inlet of the membrane separation component 44, used to transport the incompletely separated fuel vapor and air to the membrane separation component 44, and a high-pressure area is correspondingly formed outside the gas separation membrane. In addition, the fuel vapor outlet of the membrane separation component 44 is connected to the return air port of the pressurizing compressor 22 through a return air pipe 45, and the return air port is the vacuum side of the pressurizing compressor 22. Thus, under the suction action of the pressurizing compressor 22, a vacuum environment is formed between the return air pipe 45 and the central pipe area surrounded by the gas separation membrane in the membrane separation component 44. Thereby, a pressure difference exists between both sides of the gas separation membrane. Driven by the pressure difference, the fuel vapor is quickly dissolved in the gas separation membrane and penetrates through the gas separation membrane into the central pipe area, and then is recovered to the pressurizing compressor 22 through the return air pipe and enters the vapor recovery module again until it enters the gas-liquid separation component again to achieve recycling.

[0033] In addition, air molecules are repelled by the membrane surface of the gas separation membrane on the positive pressure side, cannot be dissolved in the gas separation membrane and cannot be discharged from the return air port of the membrane separation component 44. Since the fuel vapor has been basically separated and recovered, it can be directly discharged. Therefore, in this example, the air that cannot pass through the gas separation membrane is discharged to the surrounding atmosphere through the exhaust port of the membrane separation component 44. In addition, to ensure the safety and reliability of the discharge, refer to Figure 2 , in this example, a concentration meter 46 is arranged at the exhaust port of the membrane separation component 44 to detect the tail gas concentration in the discharged gas, ensure that it meets the safety and environmental protection standards, and alarm and stop the machine when the concentration exceeds the standard, ensuring the safety and reliability of the discharge after the fuel vapor is recovered. In some other embodiments, the exhaust port of the membrane separation component 44 is communicated with the gas passage of the fuel supply pump or the fuel storage tank or the ventilation pipe / oil and gas recovery pipe of the fuel storage tank through a pipeline to improve its safety.

[0034] In addition, refer to Figure 3, to achieve the organic combination of the vapor recovery module and the fuel dispenser, reduce its floor area, and lower the complexity of the process treatment. In this embodiment, the vapor pressurizing unit 2, the gas-liquid separation unit 4, and the vapor cooling unit 3 are vertically arranged on one side of the fuel filling module from bottom to top. Among them, the vapor pressurizing unit 2 is arranged at the bottom and the vapor cooling unit 3 is arranged at the top, which can increase the length of the cooling pipeline, thus contributing to the heat dissipation of the fuel vapor in the cooling pipeline. In addition, in this example, a lateral partition is provided between the vapor recovery module and the fuel filling module, making the two relatively independent; double-layer horizontal partitions are respectively provided between the vapor pressurizing unit 2, the gas-liquid separation unit 4, and the vapor cooling unit 3, forming independent spaces between the units, thereby avoiding the problem of potential safety hazards caused by fuel vapor entering the non-explosion-proof area. Additionally, in this embodiment, since through holes for passing cables and pipelines are opened at the partitions between the units, to avoid the influence of the gap between the cable and the through hole on the airtightness between the units, in this example, an airtight cable clamp is provided at the cable hole of the partition, and the pipeline hole is sealed with a pipeline seal, thereby ensuring the safety of the system.

[0035] This example also discloses a fuel vapor recovery method, which is implemented based on the above fuel dispenser with fuel vapor recovery, and specifically includes the following steps: (1) Since the fuel filling demand is random and the cooling temperature of the vapor cooling unit cannot change suddenly, during the standby or working process of the fuel dispenser, it is necessary to correspondingly control the operation or shutdown of the vapor cooling unit. Specifically, in this embodiment, the control unit monitors in real time whether the temperature in the evaporator of the vapor cooling unit is within the preset temperature range of 0 - 5°C through the temperature transmitter at the evaporator of the vapor cooling unit. If it is higher than this temperature range, the control unit interlocks to limit the startup of the fuel filling module, that is, stops the fuel supply of the fuel filling module, correspondingly shuts down the fuel supply pump and the pressurizing compressor, and shuts down the valve in the fuel supply branch corresponding to each vapor recovery fuel gun. At the same time, the refrigeration compressor in the vapor cooling unit is started, and relying on the flow and change of the refrigerant in the cooling loop, the temperature of the evaporator is cooled to within the temperature range of 0 - 5°C. When the temperature transducer in the evaporator detects that the temperature is within the temperature range of 0 - 5°C, the startup limit of the fuel filling module is correspondingly lifted.

[0036] (2) When there is a filling demand, start the fuel filling module to start filling fuel into the fuel tank to be filled. At this time, to achieve the recovery and utilization of the fuel vapor in the fuel storage tank and the fuel vapor in the fuel tank to be filled of the filling object, start the pressurizing compressor in the vapor pressurizing unit at the same time to pressurize and transport the fuel vapor generated by the fuel filling of the fuel tank to be filled and the fuel filling to the vapor cooling unit for heat exchange. During the operation of the vapor cooling unit, start the heat exchange fan to blow the heat exchanger correspondingly to accelerate the air flow and ensure the effective dissipation of the heat in the vapor cooling unit.

[0037] After the fuel vapor is cooled by the vapor cooling unit, the fuel vapor doped with liquefied gasoline output therefrom is further transported to the gas-liquid separation unit for gas-liquid separation. The liquefied gasoline is separated from the fuel vapor through the gas-liquid separation component, and the liquid level height in the gas-liquid separation component is monitored in real time through the liquid level sensor. After the liquid level height in the gas-liquid separation component reaches the set height, the liquefied fuel is correspondingly refluxed to the fuel storage tank or the inlet of the fuel supply pump. The fuel vapor separated by the gas-liquid separation component enters the membrane separation component, and air molecules are correspondingly separated under the negative pressure formed by the suction of the pressurizing compressor; and the air molecules are discharged after being detected by the concentration meter, while the fuel vapor separated by the membrane separation component is transported to the pressurizing compressor through the return pipe and enters the vapor recovery module again, and is separated and recovered by the gas-liquid separation component in the next cycle. Among them, when the monitoring value of the concentration meter at the exhaust port of the membrane separation component exceeds the set value, the fuel filling module and the vapor pressurizing unit are interlocked to be closed, an alarm is given and the machine stops, reminding the personnel to carry out maintenance. After the fuel dispenser self-checks and runs after the maintenance is completed and the measurement value of the concentration meter returns to the safe range, the control unit releases the interlock limit on the pressurizing compressor in the fuel filling module and the vapor pressurizing unit.

[0038] (4)After the fuel filling is completed, the pressurizing compressor in the fuel filling module and the vapor pressurizing unit is turned off. Return to step (1) to judge the working state of the vapor cooling unit, and repeat the above steps.

[0039] Through the emission detection of the vapor recovery module of the present disclosure, the oil and gas removal rate can reach more than 98%, and it can stably ensure that the tail gas concentration is at 5g / m 3 Hereinafter, the tail gas emission concentration is far lower than the requirements of the environmental protection standard, and the treatment and recovery effect of the fuel vapor is excellent.

[0040] Although some preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0041] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of its inventive concept. Thus, if these modifications and variations of the present invention fall within the scope of the claims of this application and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A fuel dispenser with fuel vapor recovery, characterized in that, It includes a fuel filling module which is connected to the fuel storage tank and is provided with an oil and gas recovery gun, and a vapor recovery module which is used to recover the fuel vapor at the fuel tank and is connected to the oil and gas recovery gun; the vapor recovery module includes a vapor pressurizing unit, a vapor cooling unit, and a gas-liquid separation unit which are connected to each other in sequence from upstream to downstream; the gas-liquid separation unit includes a gas-liquid separation component, and a membrane separation component which is connected to the exhaust port of the gas-liquid separation component and is used to separate the oil and liquid in the input gas; the vapor pressurizing unit, the gas-liquid separation unit, and the vapor cooling unit are arranged vertically from bottom to top on one side of the fuel dispenser.

2. The fuel dispenser according to claim 1, characterized in that, The steam pressurizing unit includes a pressurizing compressor, the air inlet of the pressurizing compressor is connected to the oil and gas recovery gun through a steam reflux pipe, the return air port of the pressurizing compressor is connected to the fuel vapor outlet of the membrane separation component through a return air pipe, and the air outlet of the pressurizing compressor is connected to the steam cooling unit.

3. The fuel dispenser according to claim 1, characterized in that, The vapor cooling unit comprises a refrigeration compressor, a heat exchanger, a dryer, an expansion valve, and an evaporator for cooling and exchanging heat of fuel vapor, which are sequentially connected in series to form a loop, and the loop is correspondingly filled with refrigerant.

4. The fuel dispenser according to claim 3, characterized in that, A ventilation window is provided at the fuel dispenser housing corresponding to the vapor cooling unit; the vapor cooling unit also includes a heat exchange fan for blowing the heat exchanger for heat exchange.

5. The fuel dispenser according to claim 1, wherein The gas-liquid separation component includes a liquid level sensor, and the liquid discharge port of the gas-liquid separation component is correspondingly connected to the inlet of the fuel storage tank or the fuel filling module through a return oil pipe connected in series with a return liquid valve.

6. The fuel dispenser according to claim 1, characterized in that, The membrane separation component comprises a cylindrical gas separation membrane for separating air molecules and oil molecules, and a concentration meter for detecting the exhaust gas concentration value is provided at the exhaust port of the membrane separation component.

7. The fuel dispenser according to claim 6, characterized in that, The exhaust port of the membrane separation component is correspondingly opened to the atmosphere, or to the gas passage of the fuel supply pump in the fuel filling module, or to the vent pipe or oil and gas recovery pipe of the fuel storage tank.

8. The fuel dispenser according to claim 1, wherein, Horizontal explosion-proof partitions are provided between the steam pressurizing unit, the steam cooling unit and the gas-liquid separation unit, and cable holes provided with cable clamps for maintaining airtightness are provided at the horizontal explosion-proof partitions.

9. A method for recovering fuel vapor, characterized in that, The method is implemented based on the fuel dispenser with fuel vapor recovery according to claim 1, and comprises the following steps: (1) The temperature transmitter in the vapor cooling unit is used to monitor in real time whether the temperature in the evaporator of the unit is within the range of 0 to 5°C. If the temperature is higher than the range, the start-up restriction of the fuel filling module is interlocked, and the vapor cooling unit is started to cool until the evaporator temperature drops to the range of 0 to 5°C, and the start-up restriction of the fuel filling module is correspondingly released; (2) when there is a need for refueling, the fuel refueling module is started to start refueling the refueling tank with fuel, and at the same time, the pressurizing compressor in the vapor pressurizing unit is started to pressurize and transport the fuel vapor generated by the refueling tank and the fuel refueling to the vapor cooling unit for heat exchange; (3)After cooling, the fuel vapor doped with liquefied gasoline is transported to the gas-liquid separation unit for gas-liquid separation. After the liquefied gasoline is separated from the fuel vapor via the gas-liquid separation component, it correspondingly returns to the fuel storage tank or the inlet of the fuel filling module; the fuel vapor enters the membrane separation component and correspondingly separates out air molecules under the negative pressure formed by the suction of the pressurizing compressor; and the air molecules are discharged after being detected by the concentration meter. When the monitoring value of the concentration meter exceeds the set value, the fuel filling module and the vapor pressurizing unit are interlocked to be closed; (4)After the filling is completed, the fuel filling module and the vapor pressurizing unit are closed, and the process returns to step (1).

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