Oil gas recovery device

Abstract

The utility model relates to the field of petrochemical engineering, and discloses an oil gas recovery device which comprises a first-stage supergravity absorption unit and a second-stage supergravity absorption unit, the first-stage supergravity absorption unit is cylindrical, an absorption section is arranged at the upper part of a cylinder body, and a liquid storage section is arranged at the lower part of the cylinder body; in the absorption section, an oil gas inlet is formed in the side wall of the barrel, and an absorbent inlet and an exhaust port are formed in the top of the barrel; in the liquid storage section, an absorbent outlet is formed in the lower part of the side wall of the barrel, and a water outlet is formed in the bottom of the barrel; a barrel of the second-stage supergravity absorption unit is cylindrical, and the barrel is provided with an absorption section; in the absorption section, an oil gas inlet is formed in the side wall of the barrel, and an absorbent inlet and an exhaust port are formed in the top of the barrel; an absorbent outlet is formed in the lower part of the side wall of the barrel; and an exhaust port of the first-stage supergravity absorption unit is connected with an oil gas inlet of the second-stage supergravity absorption unit. The device can thoroughly remove moisture in oil gas, does not need a heat exchanger for defrosting, simplifies the process flow, and saves the energy consumption of the system.

Description

Technical Field

[0001] The utility model relates to the field of petrochemical industry, and particularly relates to an oil and gas recovery device. Background Technique

[0002] In the petrochemical industry, a large amount of volatile organic compounds (VOCs) will escape during the storage and packaging process of oil products and chemicals. This not only causes serious waste of resources, reduces the economic benefits of enterprises, but also causes serious damage to the surrounding environment, directly affecting and endangering the physical health of people around. In addition, since oil and gas are easy to form an explosive mixture with air (the lower explosion limit is generally 1% - 6%), the escape of oil and gas will cause the oil and gas concentration around the corresponding facilities to easily reach the explosion limit. The oil and gas accumulating on the ground poses a great safety hazard to enterprises and consumers, endangering the safe production of enterprises. Therefore, it is very necessary to recover and treat the escaped oil and gas.

[0003] At present, the exhaust gas in the storage and packaging process of oil products in the tank farm mainly adopts the condensation method to recover oil and gas. However, the following problems mainly exist in the operation process of the condensation method oil and gas treatment device: First, the condensation system frosts seriously, and there is an ice blockage phenomenon at the switching valve or pipeline for condensation and defrosting, resulting in the condensation system being difficult to operate stably; Second, the defrosting process usually uses hot gases such as hot nitrogen or refrigerant hot steam for defrosting, which will increase the refrigeration load of the condensation unit, increase the operating power of the unit, resulting in an increase in condensation energy consumption, and will also affect the stable operation of the refrigeration system.

[0004] CN202246576U discloses an oil and gas low-temperature condensation absorption recovery device, including a refrigeration unit, a lean absorbent transfer pump, a venturi ejector, an oil and gas condensation absorption mixture separator, an oil and gas pre-cooler heat exchanger, and a pre-cooler oil and gas gas-liquid separator. The oil and gas is introduced by the venturi ejector and mixed with the low-temperature absorbent, and the oil and gas components are condensed and cooled and separated by the low-temperature absorbent. However, at the same time, the moisture in the oil and gas will be condensed and frozen by the sub-zero absorbent, and there is an ice blockage problem in the operation process of this device.

[0005] CN105289032A discloses a cold absorption method recovery process for extremely volatile organic compounds, including processes such as gas compression, cooling, condensation, absorption, separation, and residual pressure refrigeration. It combines pressurized condensation and supergravity absorption, changes deep cold recovery to shallow cold recovery, can improve the recovery efficiency, and is applicable to aspects such as organic chloride and oil and gas recovery. However, it is necessary to compress the oil and gas to a relatively high pressure for cold absorption, which requires high requirements for equipment, and the total energy consumption of the device is also relatively large. Content of the Utility Model

[0006] In order to overcome the problem of easy ice blockage existing in the condensation method oil and gas recovery device in the prior art, the utility model provides an oil and gas recovery device, which is not easy to ice block, safe and energy-saving.

[0007] To achieve the above object, the present utility model provides an oil and gas recovery device, which includes a primary high-gravity absorption unit and a secondary high-gravity absorption unit;

[0008] The primary high-gravity absorption unit is cylindrical. An absorption section is provided at the upper part of the cylinder body, and a liquid storage section is provided at the lower part of the cylinder body;

[0009] In the absorption section, an oil and gas inlet is provided on the side wall of the cylinder body, and an absorbent inlet and an exhaust port are provided at the top of the cylinder body;

[0010] In the liquid storage section, an absorbent outlet is provided at the lower part of the side wall of the cylinder body, and a drain port is provided at the bottom of the cylinder body;

[0011] The cylinder body of the secondary high-gravity absorption unit is cylindrical, and an absorption section is provided on the cylinder body;

[0012] In the absorption section, an oil and gas inlet is provided on the side wall of the cylinder body, and an absorbent inlet and an exhaust port are provided at the top of the cylinder body;

[0013] An absorbent outlet is provided at the lower part of the side wall of the cylinder body;

[0014] The exhaust port of the primary high-gravity absorption unit is connected to the oil and gas inlet of the secondary high-gravity absorption unit.

[0015] The present utility model has the following beneficial technical effects:

[0016] First, the oil and gas to be treated passes through the two-stage high-gravity absorption unit, and the water in the oil and gas can be completely removed. The water in the oil and gas is discharged from the oil and gas recovery device by means of oil-water separation and simple filtration after turning the water into ice particles, effectively avoiding the problem of ice blockage in the current condensation method oil and gas recovery setting system. At the same time, there is no need for a heat exchanger defrosting process in the present utility model, which simplifies the process flow and greatly saves the system energy consumption;

[0017] Second, the primary high-gravity unit is used to cool and separate most of the water and heavy components in the oil and gas to be treated, and the secondary high-gravity unit is used to separate the remaining C3-C5 components and water in the oil and gas. The oil and gas recovery efficiency is high and the effect is good; The primary high-gravity absorption can prevent the heavy components of the oil and gas from entering the absorbent in the secondary high-gravity absorption unit, increase the cold filter point of the absorbent in the secondary high-gravity absorption unit, and extend the long-term cyclic use of the absorbent;

[0018] Furthermore, in the preferred technical solution of the present utility model, an oil and gas heat exchanger is provided. The oil and gas to be treated exchanges heat with the tail gas of the secondary high-gravity absorption in the oil and gas heat exchanger, which can effectively utilize the cold energy contained in the low-temperature tail gas and save public works. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a diagram of an oil and gas recovery device provided by the present utility model.

[0020] Description of Reference Numerals

[0021] 101- induced air fan, 102- oil-gas cooler, 103- oil-gas heat exchanger, 104- primary super gravity absorption unit, 105- primary circulation pump, 106- primary cooler, 107- secondary super gravity absorption unit, 108- secondary circulation pump, 109- filter, 110- secondary cooler. DETAILED DESCRIPTION

[0022] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0023] The utility model provides an oil and gas recovery device, which comprises a primary super gravity absorption unit 104 and a secondary super gravity absorption unit 107 .

[0024] The primary supergravity absorption unit 104 is cylindrical, with an absorption section disposed at the upper portion of the cylinder and a liquid storage section disposed at the lower portion of the cylinder.

[0025] In the absorption section, an oil and gas inlet is arranged on the side wall of the cylinder, and an absorbent inlet and an exhaust port are arranged on the top of the cylinder.

[0026] In the liquid storage section, an absorbent outlet is provided at the lower part of the side wall of the cylinder, and a drain outlet is provided at the bottom of the cylinder.

[0027] The cylinder of the secondary supergravity absorption unit 107 is cylindrical and is provided with an absorption section.

[0028] In the absorption section, an oil and gas inlet is arranged on the side wall of the cylinder, and an absorbent inlet and an exhaust port are arranged on the top of the cylinder.

[0029] An absorbent outlet is arranged at the lower part of the side wall of the cylinder.

[0030] The exhaust port of the first-level supergravity absorption unit 104 is connected to the oil and gas inlet of the second-level supergravity absorption unit 107 .

[0031] In the present utility model, connected may refer to being directly connected through a pipeline, or may refer to being connected through a pipeline and other devices.

[0032] The technical solution provided by the utility model can completely remove moisture from oil and gas by setting up a two-stage supergravity absorption unit, and at the same time, a heat exchanger defrosting process is not required, which simplifies the process flow and greatly saves system energy consumption.

[0033] According to a preferred embodiment of the present utility model, the device further includes a primary cooler 106.

[0034] The primary cooler 106 is provided with an absorbent inlet and an outlet. The absorbent outlet of the primary supergravity absorption unit 104 is connected to the absorbent inlet of the primary cooler 106.

[0035] The absorbent outlet of the primary cooler 106 is connected to the absorbent inlet of the primary supergravity absorption unit 104.

[0036] According to a preferred embodiment of the present utility model, the device further includes a secondary cooler 110.

[0037] The secondary cooler 110 is provided with an absorbent inlet and an outlet.

[0038] The absorbent outlet of the secondary supergravity absorption unit 107 is connected to the absorbent inlet of the secondary cooler 110.

[0039] The absorbent outlet of the secondary cooler 110 is connected to the absorbent inlet of the secondary supergravity absorption unit 107.

[0040] According to a preferred embodiment of the present utility model, the device further includes a primary circulation pump 105 and a secondary circulation pump 108.

[0041] The primary circulation pump 105 and the secondary circulation pump 108 are respectively provided with an inlet and an outlet.

[0042] The inlet of the primary circulation pump 105 is connected to the absorbent outlet of the primary supergravity absorption unit 104, and the outlet of the primary circulation pump 105 is connected to the absorbent inlet of the primary cooler 106.

[0043] The inlet of the secondary circulation pump 108 is connected to the absorbent outlet of the secondary supergravity absorption unit 107, and the outlet of the secondary circulation pump 108 is connected to the absorbent inlet of the secondary cooler 110.

[0044] According to a preferred embodiment of the present utility model, a filter 109 is further provided between the secondary circulation pump 108 and the secondary cooler 110 of the device.

[0045] The filter 109 is provided with an inlet, an outlet, and a slag discharge port.

[0046] After passing through the secondary circulation pump 108, the inlet of the filter 109 is connected to the absorbent outlet of the secondary supergravity absorption unit 107.

[0047] The outlet of the filter 109 is connected to the absorbent inlet of the secondary cooler 110.

[0048] In the liquid storage section of the first-stage supergravity absorption unit 104, an ice particle inlet is further provided at the upper part of the side wall of the cylinder body.

[0049] The slag discharge port of the filter 109 is connected to the ice particle inlet of the first-stage circulation pump 105.

[0050] In the present utility model, the filter can further filter the ice particles in the absorbent to reduce ice blockage.

[0051] According to a preferred embodiment of the present utility model, the device further includes an induced air fan 101.

[0052] The induced air fan 101 is provided with an outlet, and the outlet of the induced air fan 101 is connected to the oil and gas inlet of the first-stage supergravity absorption unit 104. According to a preferred embodiment of the present utility model, the device further includes an oil and gas cooler 102.

[0053] The oil and gas cooler 102 is provided with an oil and gas inlet and an oil and gas outlet.

[0054] The oil and gas inlet of the oil and gas cooler 102 is connected to the outlet of the induced air fan 101, and the oil and gas outlet of the oil and gas cooler 102 is connected to the oil and gas inlet of the first-stage supergravity absorption unit 104.

[0055] According to a preferred embodiment of the present utility model, the device further includes an oil and gas heat exchanger 103.

[0056] The oil and gas heat exchanger 103 is provided with high-temperature oil and gas inlets and outlets.

[0057] The high-temperature oil and gas inlet of the oil and gas heat exchanger 103 is connected to the oil and gas outlet of the oil and gas cooler 102, and the high-temperature oil and gas outlet of the oil and gas heat exchanger 103 is connected to the oil and gas inlet of the first-stage supergravity absorption unit 104.

[0058] The oil and gas heat exchanger 103 is further provided with low-temperature oil and gas inlets and outlets.

[0059] The low-temperature oil and gas inlet of the oil and gas heat exchanger 103 is connected to the exhaust port of the second-stage supergravity absorption unit 107, and the low-temperature oil and gas outlet of the oil and gas heat exchanger 103 is connected to the purified gas pipeline.

[0060] In the above preferred technical solution, the oil and gas to be treated and the second-stage supergravity absorption tail gas exchange heat in the oil and gas heat exchanger 103, which can effectively utilize the cold energy contained in the low-temperature tail gas and save utilities.

[0061] According to a preferred embodiment of the present utility model, liquid supply pipes are respectively provided at the inlets of the first-stage circulation pump 105 and the second-stage circulation pump 108.

[0062] According to a preferred embodiment of the present utility model, the primary circulation pump 105 and the secondary circulation pump 108 are slurry pumps.

[0063] According to the present invention, preferably, the primary high-gravity absorption unit 104 and the secondary high-gravity absorption unit 107 are each independently selected from a disk-type, spiral plate-type, and folded-flow high-gravity rotating bed, preferably a disk-type high-gravity rotating bed.

[0064] According to a particularly preferred embodiment of the present utility model, as Figure 1 shown, the device includes a primary high-gravity absorption unit 104 and a secondary high-gravity absorption unit 107.

[0065] The primary high-gravity absorption unit 104 is cylindrical, with an absorption section provided at the upper part of the cylinder body and a liquid storage section provided at the lower part of the cylinder body.

[0066] In the absorption section, an oil and gas inlet is provided on the side wall of the cylinder body, and an absorbent inlet and an exhaust port are provided at the top of the cylinder body.

[0067] In the liquid storage section, an absorbent outlet is provided at the lower part of the side wall of the cylinder body, and a drain port is provided at the bottom of the cylinder body.

[0068] The cylinder body of the secondary high-gravity absorption unit 107 is cylindrical, and the cylinder body is provided with an absorption section.

[0069] In the absorption section, an oil and gas inlet is provided on the side wall of the cylinder body, and an absorbent inlet and an exhaust port are provided at the top of the cylinder body.

[0070] An absorbent outlet is provided at the lower part of the side wall of the cylinder body.

[0071] The exhaust port of the primary high-gravity absorption unit 104 is connected to the oil and gas inlet of the secondary high-gravity absorption unit 107.

[0072] The device further includes a primary cooler 106.

[0073] The primary cooler 106 is provided with an absorbent inlet and an outlet. The absorbent outlet of the primary high-gravity absorption unit 104 is connected to the absorbent inlet of the primary cooler 106.

[0074] The absorbent outlet of the primary cooler 106 is connected to the absorbent inlet of the primary high-gravity absorption unit 104.

[0075] The device further includes a secondary cooler 110.

[0076] The secondary cooler 110 is provided with an absorbent inlet and an outlet.

[0077] The absorbent outlet of the secondary high-gravity absorption unit 107 is connected to the absorbent inlet of the secondary cooler 110.

[0078] The absorbent outlet of the secondary cooler 110 is connected to the absorbent inlet of the secondary rotating packed bed absorption unit 107.

[0079] The device further includes a primary circulation pump 105 and a secondary circulation pump 108.

[0080] The primary circulation pump 105 and the secondary circulation pump 108 are respectively provided with an inlet and an outlet.

[0081] The inlet of the primary circulation pump 105 is connected to the absorbent outlet of the primary rotating packed bed absorption unit 104, and the outlet of the primary circulation pump 105 is connected to the absorbent inlet of the primary cooler 106.

[0082] The inlet of the secondary circulation pump 108 is connected to the absorbent outlet of the secondary rotating packed bed absorption unit 107, and the outlet of the secondary circulation pump 108 is connected to the absorbent inlet of the secondary cooler 110.

[0083] A filter 109 is further provided between the secondary circulation pump 108 and the secondary cooler 110 of the device.

[0084] The filter 109 is provided with an inlet, an outlet and a slag discharge port.

[0085] The inlet of the filter 109 is connected to the absorbent outlet of the secondary rotating packed bed absorption unit 107 after passing through the secondary circulation pump 108.

[0086] The outlet of the filter 109 is connected to the absorbent inlet of the secondary cooler 110.

[0087] In the liquid storage section of the primary rotating packed bed absorption unit 104, an ice particle inlet is further provided at the upper part of the side wall of the cylinder body.

[0088] The slag discharge port of the filter 109 is connected to the ice particle inlet of the primary circulation pump 105.

[0089] The device further includes an air extraction fan 101.

[0090] The air extraction fan 101 is provided with an outlet, and the outlet of the air extraction fan 101 is connected to the oil and gas inlet of the primary rotating packed bed absorption unit 104.

[0091] The device further includes an oil and gas cooler 102.

[0092] The oil and gas cooler 102 is provided with an oil and gas inlet and an oil and gas outlet.

[0093] The oil and gas inlet of the oil and gas cooler 102 is connected to the outlet of the air extraction fan 101, and the oil and gas outlet of the oil and gas cooler 102 is connected to the oil and gas inlet of the primary rotating packed bed absorption unit 104.

[0094] The device further includes an oil-gas heat exchanger 103.

[0095] The oil-gas heat exchanger 103 is provided with high-temperature oil-gas inlets and outlets.

[0096] The high-temperature oil-gas inlet of the oil-gas heat exchanger 103 is connected to the oil-gas outlet of the oil-gas cooler 102, and the high-temperature oil-gas outlet of the oil-gas heat exchanger 103 is connected to the oil-gas inlet of the first-stage supergravity absorption unit 104.

[0097] The oil-gas heat exchanger 103 is further provided with low-temperature oil-gas inlets and outlets.

[0098] The low-temperature oil-gas inlet of the oil-gas heat exchanger 103 is connected to the exhaust port of the second-stage supergravity absorption unit 107, and the low-temperature oil-gas outlet of the oil-gas heat exchanger 103 is connected to the purified gas pipeline.

[0099] The inlets of the first-stage circulation pump 105 and the second-stage circulation pump 108 are respectively provided with liquid supplement pipes.

[0100] The first-stage circulation pump 105 and the second-stage circulation pump 108 are slurry pumps.

[0101] The first-stage supergravity absorption unit 104 and the second-stage supergravity absorption unit 107 are disk-type supergravity rotating beds.

[0102] The following specifically describes a particularly preferred embodiment of the present invention in combination with an oil-gas recovery method:

[0103] Logistics I is the oil-gas to be treated, which is successively pressurized by the air-introducing fan 101, cooled by the oil-gas cooler 102, and heat-exchanged by the oil-gas heat exchanger 103 to obtain Logistics II.

[0104] Logistics II enters the first-stage supergravity absorption unit 104, where it undergoes countercurrent mass transfer and heat transfer with the absorbent at 4-8°C. The absorbent absorbs and condenses most of the components with C6 and above, and at the same time cools and separates the moisture in Logistics II. Most of the cooled moisture also enters the absorbent. The exhaust port of the first-stage supergravity absorption unit 104 discharges Logistics III, and Logistics III enters the second-stage supergravity absorption unit 107.

[0105] The absorbent used in the first-stage supergravity absorption is pressurized by the first-stage circulation pump 105 and cooled to 4-8°C again by the first-stage cooler 106 before re-entering the first-stage supergravity absorption unit 104 for recycling.

[0106] Logistics III undergoes countercurrent mass transfer and heat transfer with the absorbent at -35°C to -20°C in the second-stage supergravity absorption unit 107. The absorbent absorbs and condenses the components with C3 and above, and at the same time the moisture in Logistics III is directly condensed into ice particles. The exhaust port of the second-stage supergravity absorption unit 107 discharges Logistics IV.

[0107] The used absorbent for secondary supergravity absorption is pressurized by the secondary circulation pump 108, filtered for ice particles by the filter 109, and then cooled again to -35°C to -20°C by the secondary cooler 110 before entering the secondary supergravity absorption unit 107 for recycling.

[0108] Logistics IV exchanges heat with the pressurized and cooled Logistics I in the oil-gas heat exchanger 103 to obtain purified gas at a temperature of 45 - 50°C.

[0109] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solutions of the present invention, including combining each technical feature in any other suitable manner. These simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. An oil and gas recovery device, characterized in that It includes a primary supergravity absorption unit (104) and a secondary supergravity absorption unit (107); The primary supergravity absorption unit (104) is cylindrical. An absorption section is provided at the upper part of the cylinder body, and a liquid storage section is provided at the lower part of the cylinder body; In the absorption section, an oil-gas inlet is provided on the side wall of the cylinder body, and an absorbent inlet and an exhaust port are provided at the top of the cylinder body; In the liquid storage section, an absorbent outlet is provided at the lower part of the side wall of the cylinder body, and a drain port is provided at the bottom of the cylinder body; The cylinder body of the secondary supergravity absorption unit (107) is cylindrical, and an absorption section is provided on the cylinder body; In the absorption section, an oil-gas inlet is provided on the side wall of the cylinder body, and an absorbent inlet and an exhaust port are provided at the top of the cylinder body; An absorbent outlet is provided at the lower part of the side wall of the cylinder body; The exhaust port of the primary supergravity absorption unit (104) is connected to the oil-gas inlet of the secondary supergravity absorption unit (107).

2. The device according to claim 1, characterized in that, The device further includes a primary cooler (106); The primary cooler (106) is provided with an absorbent inlet and an outlet; The absorbent outlet of the primary supergravity absorption unit (104) is connected to the absorbent inlet of the primary cooler (106); The absorbent outlet of the primary cooler (106) is connected to the absorbent inlet of the primary supergravity absorption unit (104).

3. The device according to claim 2, characterized in that, The device further includes a secondary cooler (110); The secondary cooler (110) is provided with an absorbent inlet and an outlet; The absorbent outlet of the secondary supergravity absorption unit (107) is connected to the absorbent inlet of the secondary cooler (110); The absorbent outlet of the secondary cooler (110) is connected to the absorbent inlet of the secondary supergravity absorption unit (107).

4. The device according to claim 3, characterized in that, The device further includes a primary circulation pump (105) and a secondary circulation pump (108); The primary circulation pump (105) and the secondary circulation pump (108) are respectively provided with an inlet and an outlet; The inlet of the primary circulation pump (105) is connected to the absorbent outlet of the primary supergravity absorption unit (104), and the outlet of the primary circulation pump (105) is connected to the absorbent inlet of the primary cooler (106); The inlet of the secondary circulation pump (108) is connected to the absorbent outlet of the secondary supergravity absorption unit (107), and the outlet of the secondary circulation pump (108) is connected to the absorbent inlet of the secondary cooler (110).

5. The device according to claim 4, characterized in that A filter (109) is further provided between the secondary circulation pump (108) and the secondary cooler (110) of the device; The filter (109) is provided with an inlet, an outlet and a slag discharge port; After passing through the secondary circulation pump (108), the inlet of the filter (109) is connected to the absorbent outlet of the secondary supergravity absorption unit (107); The outlet of the filter (109) is connected to the absorbent inlet of the secondary cooler (110); In the liquid storage section of the primary supergravity absorption unit (104), an ice particle inlet is further provided at the upper part of the side wall of the cylinder body; The slag discharge port of the filter (109) is connected to the ice particle inlet of the primary circulation pump (105).

6. The device according to claim 5, characterized in that The device further includes an air extraction fan (101); The air extraction fan (101) is provided with an outlet, and the outlet of the air extraction fan (101) is connected to the oil-gas inlet of the primary supergravity absorption unit (104).

7. The device according to claim 6, characterized in that, The device further includes an oil-gas cooler (102); The oil-gas cooler (102) is provided with an oil-gas inlet and an oil-gas outlet; The oil-gas inlet of the oil-gas cooler (102) is connected to the outlet of the air extraction fan (101), and the oil-gas outlet of the oil-gas cooler (102) is connected to the oil-gas inlet of the first-stage supergravity absorption unit (104).

8. The device according to claim 7, characterized in that, The device further includes an oil-gas heat exchanger (103); The oil-gas heat exchanger (103) is provided with a high-temperature oil-gas inlet and outlet; The high-temperature oil-gas inlet of the oil-gas heat exchanger (103) is connected to the oil-gas outlet of the oil-gas cooler (102), and the high-temperature oil-gas outlet of the oil-gas heat exchanger (103) is connected to the oil-gas inlet of the first-stage supergravity absorption unit (104); The oil-gas heat exchanger (103) is further provided with a low-temperature oil-gas inlet and outlet; The low-temperature oil-gas inlet of the oil-gas heat exchanger (103) is connected to the exhaust port of the second-stage supergravity absorption unit (107), and the low-temperature oil-gas outlet of the oil-gas heat exchanger (103) is connected to the purified gas pipeline.

9. The device according to claim 8, characterized in that, The inlets of the first-stage circulation pump (105) and the second-stage circulation pump (108) are respectively provided with liquid supplement pipes.

10. The device according to claim 9, characterized in that, The first-stage circulation pump (105) and the second-stage circulation pump (108) are slurry pumps.

Images