Waste gas treatment device for oil gas recovery

Abstract

The utility model provides a waste gas treatment device for oil gas recovery. The waste gas treatment device comprises an air compressor, a gas-liquid separator, a first condenser, a second condenser, a separation membrane, an activated carbon canister and an oil storage tank, the gas-liquid separator is arranged at the air outlet end of the air compressor; the first condenser is arranged at the gas outlet end of the gas-liquid separator; the second condenser is connected with the first condenser; the separation membrane is arranged at a second outlet end of the first condenser, and a second outlet of the separation membrane is connected with an air inlet end of the air compressor; the activated carbon canister is arranged at the outlet end of the separation membrane; the oil storage tank is arranged at the liquid outlet end of the first condenser and used for storing condensed liquid, and an oil outlet and a water outlet are formed in the oil storage tank. The waste gas treatment device for oil gas recovery is compact in structure, low in cost, high in recovery efficiency, good in effect and wide in application range.

Description

Technical Field

[0001] The utility model relates to a waste gas treatment device, in particular to a waste gas treatment device for oil and gas recovery. Background Art

[0002] With the vigorous promotion of national environmental protection policies, oil and gas recovery devices are widely used in oil depots, gas stations, petrochemicals and other fields. If oil and gas cannot be recovered well, it will not only cause oil loss, but also pollute the environment and have great harm.

[0003] The existing oil and gas recovery device has a complex structure and high use and maintenance costs. Utility Model Content

[0004] [1] Technical issues to be solved

[0005] The technical problem to be solved by the utility model is to provide an exhaust gas treatment device for oil and gas recovery which has compact structure, high recovery efficiency and good effect and low use and maintenance cost.

[0006] 【2】Technical solutions to solve the problem

[0007] The utility model provides a waste gas treatment device for oil and gas recovery, which comprises:

[0008] An air compressor 11, used for compressing air containing oil and gas, wherein an input end of the air compressor 11 is connected to an oil and gas source;

[0009] A gas-liquid separator 12 is provided at the air outlet of the air compressor 11 and is used for separating the compressed air into gas and liquid;

[0010] The first condenser 131 is arranged at the gas outlet end of the gas-liquid separator 12, and is used to cool the air and form condensed liquid and non-condensable gas;

[0011] The second condenser 132 is connected to the first condenser 131 and is used to receive the non-condensable gas from the first condenser 131 and return the non-condensable gas to the second inlet end of the first condenser 131 as a cold source after cooling;

[0012] A separation membrane 15 is provided at the second outlet end of the first condenser 131, and is used to separate the input non-condensable gas. The second outlet of the separation membrane is connected to the air inlet end of the air compressor 11, and is used to return the gas that has not passed through the separation membrane.

[0013] An activated carbon tank is arranged at the outlet end of the separation membrane 15, and is used to adsorb the gas passing through the separation membrane and discharge it after it meets the emission standards;

[0014] The oil storage tank 14 is disposed at the liquid outlet of the first condenser 131 and is used to store condensed liquid. The oil storage tank 14 is provided with an oil outlet and a water outlet.

[0015] Furthermore, the activated carbon canister includes a first activated carbon canister 161 and a second activated carbon canister 162, which are arranged in parallel and can be used for adsorption and desorption in an alternating manner, respectively, and the outlet ends of the first activated carbon canister 161 and the second activated carbon canister 162 are connected to the air inlet end of the air compressor 11 via a vacuum pump 17.

[0016] Furthermore, a cooling system for cooling the second condenser 132 is also included.

[0017] Furthermore, the cooling system includes a first cooling device, which includes an evaporator 21, a third condenser 23, a medium tank 27 and a medium pump 28. The first outlet end of the evaporator 21 is connected to the first inlet end of the third condenser 23 after passing through a refrigeration compressor 22, the first outlet end of the third condenser 23 is connected to the first inlet end of the evaporator after passing through an expansion valve, the second inlet end of the evaporator 21 is connected to the second outlet end of the second condenser 132, and the second outlet end of the evaporator 21 is connected to the second inlet end of the second condenser 132 after passing through the medium tank 27 and the medium pump 28 in sequence.

[0018] Furthermore, a filter and a solenoid valve are provided between the first outlet end of the third condenser 23 and the evaporator.

[0019] Furthermore, the cooling system also includes a second cooling device, which includes a cooling tower 25 and a heat exchanger 26. The water outlet end of the cooling tower 25 is branched into two paths by a water pump 24 and respectively connected to the second inlet end of the third condenser 23 and the first inlet end of the heat exchanger 26. The second outlet end of the third condenser 23 and the first outlet end of the heat exchanger 26 are both connected to the water inlet end of the cooling tower 25, the second inlet end of the heat exchanger 26 is connected to the liquid outlet end of the gas-liquid separator 12, and the second outlet end of the heat exchanger 26 is connected to the air compressor.

[0020] Furthermore, the first outlet end of the heat exchanger 26 is connected to the return water end of the cooling tower after passing through a compressor.

[0021] Furthermore, the condensation temperature of the first condenser 131 is 15°-25°.

[0022] Furthermore, the condensation temperature of the second condenser 132 is 0°-5°.

[0023] Furthermore, the output pressure of the air compressor 11 is 0.6MPa-0.8MPa.

[0024] 【3】Beneficial effects

[0025] The waste gas treatment device for oil and gas recovery of the utility model adopts condensation, membrane and adsorption structures to recover oil and gas, with high recovery efficiency and good effect; the structure is optimized and improved, the operation is stable and reliable, the use effect is good, and the overall manufacturing cost, use cost and maintenance cost are low; a double cooling device is set, the power consumption is low, the recovery is thorough, and the recovery rate and emission quality are ensured; the waste gas treatment device for oil and gas recovery of the utility model has a compact structure, low cost, high recovery efficiency and good effect, and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a connection diagram of the waste gas treatment device for oil and gas recovery of the utility model;

[0027] Figure 2 It is a connection diagram of the recovery pipeline of the waste gas treatment device for oil and gas recovery of the utility model;

[0028] Figure 3 A schematic diagram of the connection of an activated carbon canister of the waste gas treatment device for oil and gas recovery of the utility model;

[0029] Figure 4 This is a schematic diagram of the connection of the cooling system of the waste gas treatment device for oil and gas recovery of the utility model. DETAILED DESCRIPTION

[0030] The following is a detailed description of the embodiments of the present utility model in conjunction with the accompanying drawings.

[0031] See also Figure 1-Figure 4 The utility model provides an exhaust gas treatment device for oil and gas recovery, which is used for treating exhaust gas containing oil and gas, so as to recover the internal oil and gas and make it meet the emission standards.

[0032] The waste gas treatment device for oil and gas recovery includes an air compressor 11, a gas-liquid separator 12, a first condenser 131, a second condenser 132, an oil storage tank 14, a separation membrane 15 and an activated carbon tank.

[0033] The input end of the air compressor 11 is connected to the oil and gas source. In the present application, it is connected to the volatile gas generated in the oil tank area or the loading and unloading area. The air compressor 11 compresses the air containing oil and gas to form compressed air. In the present embodiment, the output pressure of the air compressor 11 is 0.6MPa-0.8MPa; the gas-liquid separator 12 is arranged at the air outlet end of the air compressor 11, and is used to separate the compressed air into gas and liquid to form gas and liquid; the first condenser 131 is arranged at the air outlet end of the gas-liquid separator 12, and is used to cool the air and form condensed liquid and non-condensable gas (uncondensed gas), wherein 56%-60% of the organic components in the organic gas will condense into liquid. When connected, the first inlet end of the first condenser 131 is connected to the air outlet end of the gas-liquid separator; the oil storage tank 14 is arranged at the liquid outlet end of the first condenser 131, specifically, the liquid outlet end of the first outlet end of the first condenser, and is used Condensed liquid is stored, and the condensed gas contains oil and water. At the same time, an oil drain port and a water drain port are provided on the oil storage tank 14, which are used for draining water and oil respectively; the second condenser 132 is connected to the first condenser 131, and is used to receive the non-condensable gas of the first condenser 131, cool it, and then return it to the second inlet end of the first condenser 131 as a cold source. Specifically, the first inlet end of the second condenser is connected to the first outlet end of the first condenser for receiving gas, and the first outlet end of the second condenser is connected to the second inlet end of the first condenser; the separation membrane 15 is arranged at the second outlet end of the first condenser 131, and is used to separate the input non-condensable gas. During separation (filtration), the non-organic components in the non-condensable gas pass through the membrane with higher priority, and the second outlet (return air port) of the separation membrane is connected to the air inlet end of the air compressor 11, and is used to return the gas that has not passed through the separation membrane to the air compressor for reprocessing.

[0034] The activated carbon tank is arranged at the outlet end of the separation membrane 15, and is used to adsorb the gas passing through the separation membrane, and discharge it after reaching the emission standard; for details, refer to Figure 3 The activated carbon canister includes a first activated carbon canister 161 and a second activated carbon canister 162. The first activated carbon canister 161 and the second activated carbon canister 162 are arranged in parallel, and can be used for adsorption and desorption in an alternating manner. During adsorption, it is used to perform carbon adsorption on non-condensable gases, remove the components therein to meet the emission standards, and then discharge; while desorption is opposite to adsorption, and it is used to reversely desorb the adsorbed substances. In this embodiment, a vacuum pump 17 is provided at the outlet end (non-exhaust end) of the first activated carbon canister 161 and the second activated carbon canister 162. The air outlet end of the vacuum pump is connected to the air inlet end of the air compressor 11, which is used to return the gas desorbed by the vacuum pump to the air compressor for the next recycling process, with high recycling efficiency and good effect.

[0035] In the present application, a cooling system is also provided, which is mainly used to cool the second condenser 132. The cooling system includes a first cooling device, which includes an evaporator 21, a third condenser 23, a medium tank 27 and a medium pump 28. The first outlet end of the evaporator 21 is connected to the refrigeration compressor 22, and the outlet end of the refrigeration compressor 22 is connected to the first inlet end of the third condenser 23. In this embodiment, the refrigeration compressor 22 is a screw refrigeration compressor. The first outlet end of the third condenser 23 is connected to the first inlet end of the evaporator after passing through an expansion valve. At the same time, a filter and a solenoid valve are provided between the first outlet end of the third condenser 23 and the evaporator to form a circulation pipeline; the second inlet end of the evaporator 21 is connected to the The second outlet end of the second condenser 132 is connected, and the second outlet end of the evaporator 21 is connected to the medium tank 27. The medium is filled in the medium tank as a refrigerant. The outlet end of the medium tank is provided with a medium pump 28. The outlet end of the medium pump 28 is connected to the second inlet end of the second condenser 132, thereby forming a circulation pipeline; when working, the high-temperature and high-pressure gaseous refrigerant discharged after compression by the refrigeration compressor first enters the third condenser and is cooled into a medium-temperature and high-pressure liquid by normal temperature cooling water. The high-pressure liquid becomes a low-temperature and low-pressure liquid after throttling expansion. In the evaporator, the refrigerant liquid vaporizes and absorbs the heat of the cooled medium to become a low-temperature and low-pressure saturated gas or superheated steam; the above-mentioned first cooling device is mainly used to cool the second condenser and the first condenser.

[0036] In this embodiment, the cooling system also includes a second cooling device, which includes a cooling tower 25 and a heat exchanger 26. A water pump 24 is provided at the water outlet of the cooling tower 25. The outlet of the water pump 24 branches into two paths, one of which is connected to the second inlet of the third condenser 23, and the other is connected to the first inlet of the heat exchanger 26. The second outlet of the third condenser 23 is connected to the water inlet of the cooling tower 25. The first outlet of the heat exchanger 26 is connected to the return water end of the cooling tower after passing through a compressor. The compressor is an air compressor for compressing gas into liquid. The second inlet of the heat exchanger 26 is connected to the liquid outlet of the gas-liquid separator 12, and the second outlet of the heat exchanger 26 is connected to the air compressor to form a cooling cycle. During operation, the cooling water from the cooling tower enters the heat exchanger through the rear part of the water pump, undergoes sufficient heat exchange with the high-temperature water after gas-liquid separation, and then enters the compressor to cool the exhaust gas.

[0037] The first inlet end of the first condenser, the second condenser, the third condenser, the evaporator, the heat exchanger, etc. are connected to the first outlet end, and the second inlet end is connected to the second outlet end, forming two independent flow pipelines, and heat transfer, i.e. heat exchange, is performed between the two pipelines through internal fins or other means.

[0038] In this embodiment, the condensation temperature of the first condenser 131 is 15°-25°, and the condensation temperature of the second condenser 132 is 0°-5°.

[0039] The waste gas treatment device for oil and gas recovery of the utility model adopts condensation, membrane and adsorption structures to recover oil and gas, with high recovery efficiency and good effect; the structure is optimized and improved, the operation is stable and reliable, the use effect is good, and the overall manufacturing cost, use cost and maintenance cost are low; a double cooling device is set, the power consumption is low, the recovery is thorough, and the recovery rate and emission quality are ensured; the waste gas treatment device for oil and gas recovery of the utility model has a compact structure, low cost, high recovery efficiency and good effect, and a wide range of applications.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A waste gas treatment device for oil and gas recovery, characterized in that: include: An air compressor, used for compressing air containing oil and gas, wherein an input end of the air compressor is connected to an oil and gas source; A gas-liquid separator, arranged at the air outlet of the air compressor, for separating the compressed air into gas and liquid; A first condenser, arranged at the gas outlet end of the gas-liquid separator, for cooling the air and forming condensed liquid and non-condensable gas; A second condenser, connected to the first condenser, for receiving the non-condensable gas of the first condenser and returning the non-condensable gas to the second inlet end of the first condenser as a cold source after cooling; A separation membrane is arranged at the second outlet end of the first condenser, and is used to separate the input non-condensable gas. The second outlet of the separation membrane is connected to the air inlet end of the air compressor, and is used to return the gas that has not passed through the separation membrane. An activated carbon tank is arranged at the outlet end of the separation membrane, and is used to adsorb the gas passing through the separation membrane and discharge it after it meets the emission standards; The oil storage tank is arranged at the liquid outlet end of the first condenser and is used to store the condensed liquid. The oil storage tank is provided with an oil discharge port and a water discharge port.

2. The waste gas treatment device for oil and gas recovery according to claim 1, characterized in that: The activated carbon canister includes a first activated carbon canister and a second activated carbon canister, the first activated carbon canister and the second activated carbon canister are arranged in parallel and can be used for adsorption and desorption in an alternating manner, and the outlet ends of the first activated carbon canister and the second activated carbon canister are connected to the air inlet end of the air compressor via a vacuum pump.

3. The waste gas treatment device for oil and gas recovery according to claim 1, characterized in that: Also included is a cooling system for cooling the second condenser.

4. The waste gas treatment device for oil and gas recovery according to claim 3, characterized in that: The cooling system includes a first cooling device, which includes an evaporator, a third condenser, a medium tank and a medium pump. The first outlet end of the evaporator is connected to the first inlet end of the third condenser after passing through a refrigeration compressor, the first outlet end of the third condenser is connected to the first inlet end of the evaporator after passing through an expansion valve, the second inlet end of the evaporator is connected to the second outlet end of the second condenser, and the second outlet end of the evaporator is connected to the second inlet end of the second condenser after passing through the medium tank and the medium pump in sequence.

5. The waste gas treatment device for oil and gas recovery according to claim 4, characterized in that: A filter and a solenoid valve are provided between the first outlet end of the third condenser and the evaporator.

6. The waste gas treatment device for oil and gas recovery according to claim 4, characterized in that: The cooling system also includes a second cooling device, which includes a cooling tower and a heat exchanger. The water outlet of the cooling tower is branched into two paths by a water pump and respectively connected to the second inlet end of the third condenser and the first inlet end of the heat exchanger. The second outlet end of the third condenser and the first outlet end of the heat exchanger are both connected to the water inlet end of the cooling tower, the second inlet end of the heat exchanger is connected to the liquid outlet end of the gas-liquid separator, and the second outlet end of the heat exchanger is connected to the air compressor.

7. The waste gas treatment device for oil and gas recovery according to claim 6, characterized in that: The first outlet end of the heat exchanger is connected to the return water end of the cooling tower after passing through a compressor.

8. The waste gas treatment device for oil and gas recovery according to claim 1, characterized in that: The condensation temperature of the first condenser is 15°-25°.

9. The waste gas treatment device for oil and gas recovery according to claim 1, characterized in that: The condensation temperature of the second condenser is 0°-5°.

10. The waste gas treatment device for oil and gas recovery according to claim 1, characterized in that: The output pressure of the air compressor is 0.6MPa-0.8MPa.

Images