Petroleum refining waste gas treatment device

Abstract

The utility model belongs to the technical field of petrochemical waste gas treatment, and relates to a petroleum refining waste gas treatment device, which comprises a gas inlet pipeline, and an evaporation cooler, a gas-liquid separation tank, a first solvent absorption tank, a second solvent absorption tank, a discharge buffer tank and an activated carbon adsorption tank which are connected in sequence, and further comprises a circulation pipeline, the circulating pipeline is connected with a liquid inlet and a liquid outlet of the water cooling unit, and a solvent circulating pump is arranged on the circulating pipeline. The waste gas treatment device adopting the structure can be used for collecting peculiar smell waste gas generated by startup and shutdown purging of the device, can be used for quickly treating hydrogen sulfide and VOCs volatile gas through wet cooling, two-stage absorption, physical condensation and adsorption, and has good economic and social benefits.

Description

Technical Field

[0001] The utility model belongs to the technical field of petrochemical waste gas treatment, and relates to a waste gas treatment device for petroleum refining, in particular to a deodorization and VOCs waste gas treatment device for sulfide-containing and VOCs waste gas generated in the industrial production process of petroleum refining. Background Technique

[0002] During the overhaul of pipeline equipment in petrochemical plants, irritating odor gases such as hydrogen sulfide and VOCs will escape. The escape of odor gases into the atmospheric environment causes pollution, which will cause great harm to human health and pose a safety risk of personnel poisoning. How to control the malodorous pollution of hydrogen sulfide and the over-standard emission of pollutants such as VOCs and ensure the safety and health of personnel during the device overhaul is of extremely important significance.

[0003] At present, most of the production devices of petrochemical enterprises only collect and treat the organized waste gas generated, but during the start-up, shutdown and overhaul of production devices or in case of production anomalies, the unorganized waste gas generated cannot be collected and treated. The movable integrated skid-mounted treatment process for removing odor and VOCs can effectively solve the pollution of unorganized waste gas generated during anomalies, ensure the collection, treatment and up-to-standard emission of unorganized waste gas, and ensure a good environment around the enterprise and the physical health of personnel.

[0004] The unorganized waste gas emissions from petrochemical production devices are generally discharged through high-point flaring or low-point flushing with steam. For traditional fixed waste gas treatment facilities, first, there are differences in distance during collection, which makes construction difficult, and it is also very difficult to meet the up-to-standard emission of the treatment of complex waste gas containing odor and VOCs.

[0005] At present, for the collection and treatment of unorganized waste gas in the petroleum refining industry, especially the treatment of waste gas containing VOCs and malodorous gas, different process equipment is required according to different pollution factors of the treated waste gas, and there are many inconveniences in operation. The treatment efficiency of traditional single processes is difficult to meet expectations. Summary of the Invention

[0006] In order to solve the problems in the prior art that unorganized waste gas is difficult to collect and treat, and different devices need to be replaced to treat malodorous gases such as VOCs and hydrogen sulfide, a petroleum refining waste gas treatment device with environmental protection and high efficiency is provided. The skid-mounted waste gas treatment device can collect the odor waste gas generated during the start-up, shutdown and purging of the device, and can quickly treat hydrogen sulfide and VOCs volatile gases through wet cooling, two-stage absorption, physical condensation and adsorption.

[0007] The petroleum refining waste gas treatment device can complete the standard treatment of sulfide gases and volatile organic compounds during abnormal production equipment or inspection and maintenance, eliminating the safety risk of poisoning. The entire construction is connected through pipelines and is completed entirely outside the equipment, reducing the area occupied by inspection and maintenance and meeting safe production requirements.

[0008] The specific technical solution of the utility model is as follows:

[0009] A petroleum refining waste gas treatment device comprises an air inlet pipeline, and an evaporative cooler, a gas-liquid separation tank, a first solvent absorption tank, a second solvent absorption tank, a discharge buffer tank and an activated carbon absorption tank connected in sequence, wherein the air outlet of the gas-liquid separation tank is connected to the first air inlet of the first solvent absorption tank, the first air outlet is connected to the second air inlet of the second solvent absorption tank through a pipeline, the second air outlet of the second solvent absorption tank is connected to the discharge buffer tank through a liquid ring vacuum pump, and the air outlet of the discharge buffer tank is connected to the activated carbon absorption tank; it also comprises a circulation pipeline, the circulation pipeline is connected to the liquid inlet and the liquid outlet of a water cooling unit; the circulation pipeline is also connected to the first liquid inlet and the first liquid outlet of the first solvent absorption tank, and the second liquid inlet and the second liquid outlet of the second solvent absorption tank through pipelines, and a solvent circulation pump is arranged on the circulation pipeline.

[0010] After the exhaust gas enters the evaporative cooling, it enters the gas-liquid separation tank to discharge the condensate, enters the first air inlet of the first solvent absorption tank, enters from the bottom and exits from the top, is discharged from the first air outlet on the top after being sprayed and washed, enters the second solvent absorption tank from the second air inlet, enters from the bottom and exits from the top, is discharged from the second air outlet on the top after being sprayed and washed, and after being attracted and removed from the water in the gas phase by the liquid ring vacuum pump and the discharge buffer tank, it enters the activated carbon adsorption tank for adsorption treatment and meets the emission standards.

[0011] A two-stage absorption is set up, and a water cooling unit is installed in the circulation pipeline, which helps to improve the efficiency of absorption and adsorption and improve the treatment effect.

[0012] Preferably, the first solvent absorption tank includes a first tank body, a first air outlet is arranged on the top of the first tank body, a first air inlet is arranged on the lower side of the first tank body, a first liquid inlet is arranged on the upper side of the first tank body, a first spray device is arranged inside the first tank body corresponding to the first liquid inlet, the first spray device of the first tank body is fixed above the first support block, a first filling area is arranged inside the first tank body, between the first air inlet and the first liquid inlet, the first filling area is arranged above the first plate-shaped supporting part fixedly arranged inside the first tank body, a first liquid outlet is arranged at the bottom of the first tank body, and a first liquid level gauge upper interface and a first liquid level gauge lower interface are arranged in sequence from top to bottom on the side below the first tank body.

[0013] Preferably, the second solvent absorption tank includes a second tank body, with a second gas outlet provided at the top of the second tank body, a second gas inlet provided at the lower side of the second tank body, a second liquid inlet provided at the upper side of the second tank body, a second spraying device provided corresponding to the second liquid inlet inside the second tank body, the second spraying device of the second tank body being fixed above the second support block, a second packing area provided between the second gas inlet and the second liquid inlet inside the second tank body, the second packing area being arranged above a second support part which is fixedly arranged in a plate shape inside the second tank body, a second liquid outlet provided at the bottom of the second tank body, and a second liquid level gauge upper interface and a second liquid level gauge lower interface being arranged in sequence from top to bottom at the side of the lower part of the second tank body for connecting a liquid level gauge.

[0014] The spraying device of the absorption tank sprays the cleaning liquid downward, and the waste gas enters from the gas inlet of the tank body and moves upward from bottom to top. After being absorbed by the sprayed cleaning liquid, it is discharged from the gas outlet at the top of the pipe body.

[0015] Preferably, a first regulating valve is provided at the front end of the evaporative condenser, and a branch road which is directly connected to the first gas inlet of the first solvent absorption tank and is provided with a second regulating valve is opened at the front end of the first regulating valve.

[0016] During use, according to the different gases to be treated, the first regulating valve and the second regulating valve are selectively switched. For example, when the gas to be treated is high-temperature VOCs waste gas, the first regulating valve is opened and the second regulating valve is closed. After the high-temperature VOCs waste gas is cooled and gas-liquid separated by the evaporative condenser, it enters the subsequent absorption and adsorption processes; when the gas to be treated is malodorous gas containing hydrogen sulfide, etc., the second regulating valve is opened and the first regulating valve is closed, and the malodorous gas directly enters the solvent absorption tank.

[0017] Preferably, the liquid inlet of the liquid ring vacuum pump is connected to the liquid outlet of the discharge buffer tank, the outlet of the liquid ring vacuum pump is connected to the discharge buffer tank, and a liquid injection port through which circulating liquid can be injected inward is provided on the discharge buffer tank.

[0018] The discharge buffer tank can provide circulating liquid to the liquid ring vacuum pump by utilizing the pressure difference between the liquid ring vacuum pump and the discharge buffer tank through the connection with the liquid inlet of the liquid ring vacuum pump. After the waste gas to be treated enters the discharge buffer tank through the liquid ring vacuum pump, under the action of gravity, the liquid in the gas phase deposits in the liquid layer of the discharge buffer tank, which can avoid the gas phase from carrying water liquid and remove part of the moisture, thereby improving the efficiency of subsequent activated carbon adsorption.

[0019] Preferably, a waste liquid pipeline with a valve is also provided on the circulating pipeline.

[0020] Through the waste liquid pipeline, the waste liquid in the circulating pipeline can be led out of the treatment system.

[0021] Preferably, a number of three-way valves are provided on the circulation pipeline for connecting different components, and different circulation modes of the absorption liquid are realized by adjusting the opening of the valves on the corresponding pipelines; by adjusting the three-way valves and each valve, the circulating pipeline can be replenished with liquid through the liquid inlet pipeline.

[0022] The technical solution of the present utility model has achieved the following technical effects:

[0023] 1) By setting up a circulation pipeline and two-stage absorption, and cooling the cleaning liquid through a water-cooled unit on the circulation pipeline, the absorption and treatment efficiency is improved.

[0024] 2) The treatment device has the characteristics of capturing and absorbing malodorous and VOCs gases at the same time, and can switch the treatment process according to the different gases to be treated and treatment targets, and can selectively realize VOCs treatment and sulfide treatment. For the high-temperature waste gas from the distillation tower and pipeline purging of the device, the waste gas is pretreated by primary water-cooling, and after gas-liquid separation, the waste gas is subjected to primary solvent absorption, and then enters secondary cooling absorption. The waste gas treatment efficiency can reach more than 90%. Finally, the waste gas is adsorbed and discharged up to standard through the activated carbon adsorption unit.

[0025] 3) The treatment device drives the gas into the activated carbon adsorption tank through the negative pressure between the liquid ring pump and the buffer tank, so that the water liquid in the gas phase settles by gravity to the bottom of the buffer tank, improving the treatment capacity of the activated carbon adsorption tank;

[0026] 4) It brings great help to the safe and environmental protection operation of the device equipment maintenance, has good mobility for easy transfer and handling during use, basically does not produce secondary pollution during the operation of the equipment, and has good economic and social benefits. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of an oil refining waste gas treatment device;

[0028] Figure 2 It is a schematic diagram of the first solvent absorption tank;

[0029] Figure 3 It is a schematic diagram of the second solvent absorption tank;

[0030] Wherein: 1 is an evaporation cooler; 2 is a gas-liquid separation tank; 3 is a first solvent absorption tank; 3-1 is a first tank body; 3-2 is a first air inlet; 3-3 is a first air outlet; 3-4 is a first liquid inlet; 3-5 is a first liquid outlet; 3-6 is a first spraying device; 3-7 is a first support block; 3-8 is a first packing area; 3-9 is a first support part; 3-10 is a lower interface of the first liquid level gauge; 3-11 is an upper interface of the first liquid level gauge; 4 is a solvent circulation pump; 5 is a second solvent absorption tank; 5-1 is a second tank body; 5-2 is a second air inlet; 5-3 is a second air outlet; 5-4 is a second liquid inlet; 5-5 is a second liquid outlet; 5-6 is a second spraying device; 5-7 is a second support block; 5-8 is a second packing area; 5-9 is a second support part; 5-10 is a lower interface of the second liquid level gauge; 5-11 is an upper interface of the second liquid level gauge; 6 is a water-cooled unit; 7 is a liquid ring vacuum pump; 8 is a discharge buffer tank; 9 is an activated carbon adsorption tank; 10 is a first regulating valve; 11 is a second regulating valve; 12 is a waste liquid pipeline; 13 is a circulation pipeline. Detailed implementation mode

[0031] The technical solution of the present invention will be further described below in conjunction with specific embodiments. These embodiments are only used to more specifically describe the technical solution of the present invention and should not be construed as limiting the protection scope of the present invention.

[0032] Embodiment 1

[0033] An oil refining waste gas treatment device is installed and integrated in a skid-mounted manner. The specific structure is as follows:

[0034] Figure 2 Shown is a schematic diagram of the first solvent absorption tank 3. The first solvent absorption tank 3 includes a first tank body 3-1. A first air outlet 3-3 is arranged at the top of the first tank body 3-1, a first air inlet 3-2 is arranged at the lower side part of the first tank body 3-1, a first liquid inlet 3-4 is arranged at the upper side part of the first tank body 3-1, a first spraying device 3-6 is arranged inside the first tank body 3-1 corresponding to the first liquid inlet 3-4, the first spraying device 3-6 of the first tank body 3-1 is fixed above the first support block 3-7, a first packing area 3-8 is arranged between the first air inlet 3-2 and the first liquid inlet 3-4 inside the first tank body 3-1, the first packing area 3-8 is arranged above a plate-shaped first support part 3-9 fixedly arranged inside the first tank body 3-1, a first liquid outlet 3-5 is arranged at the bottom of the first tank body 3-1, and a first liquid level gauge upper interface 3-11 and a first liquid level gauge lower interface 3-10 are arranged in sequence from top to bottom at the side part below the first tank body 3-1 for connecting a liquid level gauge.

[0035] Figure 3The figure shows a schematic diagram of the second solvent absorption tank 5. The second solvent absorption tank 5 includes a second tank body 5-1. A second air outlet 5-3 is provided at the top of the second tank body 5-1. A second air inlet 5-2 is provided at the lower side of the second tank body 5-1. A second liquid inlet 5-4 is provided at the upper side of the second tank body 5-1. A second spraying device 5-6 is provided inside the second tank body 5-1 corresponding to the second liquid inlet 5-4. The second spraying device 5-6 of the second tank body 5-1 is fixed above the second support block 5-7. A second packing area 5-8 is provided inside the second tank body 5-1 between the second air inlet 5-2 and the second liquid inlet 5-4. The second packing area 5-8 is arranged above a second support part 5-9 which is fixedly arranged in a plate shape inside the second tank body 5-1. A second liquid outlet 5-5 is provided at the bottom of the second tank body 5-1. A second liquid level gauge upper interface 5-11 and a second liquid level gauge lower interface 5-10 are sequentially arranged from top to bottom at the side of the second tank body 5-1 for connecting a liquid level gauge.

[0036] Figure 1 The figure shows a structural schematic diagram of an oil refining waste gas treatment device. The intake pipeline is sequentially connected to an evaporation cooler 1 and a gas-liquid separation tank 2. The air outlet of the gas-liquid separation tank 2 is connected to the first air inlet 3-2 of the first solvent absorption tank 3. A first regulating valve 10 is provided at the front end of the evaporation cooler 1. A branch road which is directly connected to the first air inlet 3-2 of the first solvent absorption tank 3 and is provided with a second regulating valve 11 is opened at the front end of the first regulating valve 10. The first air outlet 3-3 is connected to the second air inlet 5-2 of the second solvent absorption tank 5 through a pipeline. The second air outlet 5-3 of the second solvent absorption tank 5 is connected to a discharge buffer tank 8 through a liquid ring vacuum pump 7. The air outlet of the discharge buffer tank 8 is connected to an activated carbon adsorption tank 9.

[0037] When the incoming gas to be treated is high-temperature steam (such as high-temperature waste gas containing VOCs), the first regulating valve 10 is opened and the second regulating valve 11 is closed. At this time, the high-temperature steam sequentially enters the evaporation cooler 1 and the gas-liquid separation tank 2. After cooling and gas-liquid separation, it then enters the absorption and adsorption process. When the incoming gas to be treated is not high-temperature steam (such as odor gas), no cooling treatment is required. At this time, the second regulating valve 11 is opened and the first regulating valve 10 is closed, and the gas directly enters the first solvent absorption tank 3.

[0038] The liquid inlet of the liquid ring vacuum pump 7 is connected to the liquid outlet of the discharge buffer tank 8. The outlet of the liquid ring vacuum pump 7 is connected to the discharge buffer tank 8. A liquid injection port through which circulating liquid can be injected inward is provided on the discharge buffer tank 8. A certain amount of circulating liquid is injected into the first discharge buffer tank 8 before the device runs. Through the connection between the liquid ring vacuum pump 7 and the discharge buffer tank 8, the pressure difference between the liquid ring vacuum pump 7 and the discharge buffer tank 8 can be utilized to supply circulating liquid to the liquid ring vacuum pump 7 through the discharge circulation tank 8 and draw the gas into the discharge buffer tank 8.

[0039] The interior of the discharge buffer tank 8 can be divided into a gas layer and a liquid layer. After the gas treated by the absorption tank enters the discharge buffer tank 8, the liquid inside the gas enters the liquid layer through gravity sedimentation, avoiding water liquid in the gas phase, removing part of the moisture and entering the activated carbon adsorption tank 9.

[0040] The petroleum refining waste gas treatment device further includes a circulation pipeline 13, which is connected to the first liquid inlet 3-4 and the first liquid outlet 3-5 of the first solvent absorption tank 3, and the second liquid inlet 5-4 and the second liquid outlet 5-5 of the second solvent absorption tank 5 through pipelines. A solvent circulation pump 4 is arranged on the circulation pipeline 13. After the cleaning liquid for solvent absorption is discharged from the first solvent absorption tank 3 and the second solvent absorption tank 5, it re-enters the first solvent absorption tank 3 and the second solvent absorption tank 5 through the circulation pipeline 13. At the same time, the circulation pipeline 13 can also replenish the cleaning liquid into the system. The circulation pipeline 13 is also connected to the liquid inlet and the liquid outlet of the water-cooled unit 6. The water-cooled unit cools the circulating cleaning liquid, which is beneficial to improving the efficiency of solvent absorption and adsorption and promoting the treatment of pollutants.

[0041] A number of three-way valves can be arranged on the circulation pipeline 13 to connect different components, and different circulation modes of the absorption liquid are realized by adjusting the opening of the valves on the corresponding pipelines; by adjusting the three-way valves and each valve, the liquid can be replenished into the circulation pipeline through the liquid inlet pipeline, and specific examples are as follows:

[0042] Valves are arranged at all connections of the circulation pipeline 13. Through the adjustment of the valves, in the circulation pipeline 13, the first liquid inlet 3-4 and the first liquid outlet 3-5 of the first solvent absorption tank 3 circulate independently, or the second liquid inlet 5-4 and the second liquid outlet 5-5 of the second solvent absorption tank 5 circulate independently, or the first solvent absorption tank 3 and the second solvent absorption tank 5 circulate together.

[0043] Preferably, after the liquid of the first solvent absorption tank 3 flows out through the first liquid outlet 3-5, and after the liquid of the second solvent absorption tank 5 flows out through the second liquid outlet 5-5, the valves are adjusted to make the liquid first cooled by the water-cooled unit 6 and then enter the circulation pipeline 13.

[0044] Preferably, a waste liquid pipeline 12 with a valve is further arranged on the circulation pipeline 13, and the cleaning liquid in the circulation pipeline 13 can be discharged through the waste liquid pipeline 12.

[0045] Valves are arranged at all connections of the device as required.

[0046] Example 2

[0047] Use the device described in Example 1 to treat VOCs in the waste gas. When in use, open the first regulating valve 10 and close the second regulating valve 11.

[0048] For the circulating pipeline 13 of the device and the cleaning liquid sprayed by the absorption tank, various forms of VOCs treatment agents can be selected, and an alkane oil mixed formulation treatment agent is preferably used.

[0049] The specific usage process is as follows: The high-temperature waste gas containing VOCs first enters the evaporation cooler 1 and is cooled to 40 - 50 °C, then enters the gas-liquid separation tank 2 to discharge the condensate. The waste gas enters the first air inlet 3-2 of the first solvent absorption tank 3, flows from bottom to top, and is discharged from the first air outlet 3-3 at the top after spray washing. It enters the second solvent absorption tank 5 from the second air inlet 5-2, flows from bottom to top, and is discharged from the second air outlet 5-3 at the top after spray washing. After being attracted by the liquid ring vacuum pump 7 and the discharge buffer tank 8 to remove the water liquid in the gas phase, it enters the activated carbon adsorption tank 9 for adsorption treatment and then reaches the standard for discharge.

[0050] The liquid circulating pipeline 13 between the first solvent absorption tank 3 and the second solvent absorption tank 5 described in Example 1 makes the cleaning liquid circulate continuously, and the total amount of the cleaning liquid is regulated through the liquid inlet pipeline and the waste liquid pipeline 12.

[0051] The water-cooled unit 6 connected to the circulating pipeline 13 can cool the cleaning liquid, which is beneficial to improving the efficiency of solvent absorption and adsorption and promoting the treatment of pollutants.

[0052] Example 3

[0053] Use the device described in Example 1 to treat the odor gas in the waste gas. When in use, open the second regulating valve 11 and close the first regulating valve 10.

[0054] For the circulating pipeline 13 of the device and the cleaning liquid sprayed by the absorption tank, various forms of deodorization treatment agents can be selected, and a sodium salt mixed aqueous solution type treatment agent is preferably used.

[0055] The specific usage process is as follows: The waste gas containing odor gas (such as sulfides like hydrogen sulfide) directly enters the first air inlet 3-2 of the first solvent absorption tank 3, flows from bottom to top, and is discharged from the first air outlet 3-3 at the top after spray washing. It enters the second solvent absorption tank 5 from the second air inlet 5-2, flows from bottom to top, and is discharged from the second air outlet 5-3 at the top after spray washing. After being attracted by the liquid ring vacuum pump 7 and the discharge buffer tank 8 to remove the water liquid in the gas phase, it enters the activated carbon adsorption tank 9 for adsorption treatment and then reaches the standard for discharge.

[0056] The liquid circulating pipeline 13 between the first solvent absorption tank 3 and the second solvent absorption tank 5 described in Example 1 makes the cleaning liquid circulate continuously, and the total amount of the cleaning liquid is regulated through the liquid inlet pipeline and the waste liquid pipeline 12.

[0057] The water-cooled unit 6 connected to the circulating pipeline 13 can cool the cleaning liquid, which is beneficial to improving the efficiency of solvent absorption and adsorption and promoting the treatment of pollutants.

[0058] Experimental Example 1

[0059] Using the processing device described in Example 1, through the VOCs treatment method and odor gas treatment method described in Example 2 and Example 3 respectively, the purge gas of the coking fractionation tower, the gas at the top of the sulfuric acid water tank, the steaming gas of the petroleum naphtha storage tank, and the steaming and blowing waste gas of the light dirty oil tank were treated. When applying the VOCs treatment method and odor gas treatment method described in Example 2 and Example 3, the system needs to be purged in advance and then the corresponding treatment reagents are introduced to avoid cross-influence. The treatment results are shown in Table 1.

[0060] Among them, the detection of VOCs was carried out with reference to "Technical Requirements and Detection Methods for Portable Monitors of Total Hydrocarbons, Methane and Non-Methane Total Hydrocarbons in Ambient Air and Exhaust Gas (HJ 1012-2018)", and the detection method of hydrogen sulfide was referred to

[0061] "Determination of Hydrogen Sulfide, Methyl Mercaptan, Methyl Sulfide and Dimethyl Disulfide in Ambient Air - Gas Chromatography (GB / T 14678-1993)".

[0062] Table 1 Effects of Treating Different Waste Gases with VOCs and Hydrogen Sulfide by this Device

[0063]

[0064] According to the experimental results in Table 1, it can be seen that using this device to treat VOCs and odor gases can significantly reduce the content of VOCs and hydrogen sulfide in the waste gas, and the treatment efficiency is above 90%, with an ideal treatment efficiency.

[0065] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any equivalent replacement, modification, etc. made by those skilled in the art without any creative work within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oil refining waste gas treatment device, characterized in that, It includes an intake pipeline, and an evaporation cooler (1), a gas-liquid separation tank (2), a first solvent absorption tank (3), a second solvent absorption tank (5), a discharge buffer tank (8) and an activated carbon adsorption tank (9) connected in sequence. The gas outlet of the gas-liquid separation tank (2) is connected to the first gas inlet (3-2) of the first solvent absorption tank (3), and the first gas outlet (3-3) is connected to the second gas inlet (5-2) of the second solvent absorption tank (5) through a pipeline. The second gas outlet (5-3) of the second solvent absorption tank (5) is connected to the discharge buffer tank (8) through a liquid ring vacuum pump (7), and the gas outlet of the discharge buffer tank (8) is connected to the activated carbon adsorption tank (9); It also includes a circulation pipeline (13), and this circulation pipeline (13) is connected to the liquid inlet and liquid outlet of a water-cooled unit (6); This circulation pipeline is also connected to the first liquid inlet (3-4) and the first liquid outlet (3-5) of the first solvent absorption tank (3), and the second liquid inlet (5-4) and the second liquid outlet (5-5) of the second solvent absorption tank (5) through pipelines, and a solvent circulation pump (4) is arranged on the circulation pipeline (13).

2. The petroleum refining waste gas treatment device according to claim 1, characterized in that, The first solvent absorption tank (3) includes a first tank body (3-1). A first gas outlet (3-3) is arranged at the top of the first tank body (3-1), a first gas inlet (3-2) is arranged at the lower side part of the first tank body (3-1), a first liquid inlet (3-4) is arranged at the upper side part of the first tank body (3-1), a first spraying device (3-6) is arranged inside the first tank body (3-1) corresponding to the first liquid inlet (3-4), the first spraying device (3-6) of the first tank body (3-1) is fixed above a first support block (3-7), a first packing area (3-8) is arranged inside the first tank body (3-1) between the first gas inlet (3-2) and the first liquid inlet (3-4), the first packing area (3-8) is arranged above a first support part (3-9) which is fixedly arranged in a plate shape inside the first tank body (3-1), a first liquid outlet (3-5) is arranged at the bottom of the first tank body (3-1), and a first liquid level gauge upper interface (3-11) and a first liquid level gauge lower interface (3-10) are arranged in sequence from top to bottom at the side part below the first tank body (3-1).

3. The oil refining waste gas treatment device according to claim 1, characterized in that, The second solvent absorption tank (5) includes a second tank body (5-1). A second air outlet (5-3) is provided at the top of the second tank body (5-1). A second air inlet (5-2) is provided at the lower side of the second tank body (5-1). A second liquid inlet (5-4) is provided at the upper side of the second tank body (5-1). A second spraying device (5-6) is provided inside the second tank body (5-1) corresponding to the second liquid inlet (5-4). The second spraying device (5-6) of the second tank body (5-1) is fixed above the second support block (5-7). A second packing area (5-8) is provided inside the second tank body (5-1) between the second air inlet (5-2) and the second liquid inlet (5-4). The second packing area (5-8) is provided above a second support part (5-9) which is fixedly arranged in a plate shape inside the second tank body (5-1). A second liquid outlet (5-5) is provided at the bottom of the second tank body (5-1). A second liquid level gauge upper interface (5-11) and a second liquid level gauge lower interface (5-10) are sequentially provided from top to bottom at the side of the second tank body (5-1) below for connecting a liquid level gauge.

4. The petroleum refining waste gas treatment device according to claim 1, characterized in that, A first regulating valve (10) is provided at the front end of the evaporation cooler (1). A branch path which is directly connected to the first air inlet (3-2) of the first solvent absorption tank (3) and is provided with a second regulating valve (11) is opened at the front end of the first regulating valve (10).

5. The petroleum refining waste gas treatment device according to claim 1, characterized in that, The liquid inlet of the liquid ring vacuum pump (7) is connected to the liquid outlet of the discharge buffer tank (8). The outlet of the liquid ring vacuum pump (7) is connected to the discharge buffer tank (8), and a liquid injection port for injecting circulating liquid inward is provided on the discharge buffer tank (8).

6. The oil refining waste gas treatment device according to claim 1, wherein, A waste liquid pipeline (12) with a valve is also provided on the circulating pipeline (13).

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