A system and method for processing oil and gas

Abstract

The application provides a system and method for treating oil and gas, wherein the system comprises a booster connected with a first absorption tower and a second absorption tower respectively; the first absorption tower and a first adsorption tower are connected in series to form a first treatment line; the second absorption tower and a second adsorption tower are connected in series to form a second treatment line; the first absorption tower and the second absorption tower are connected with a liquid collecting tank respectively; and the first adsorption tower and the second adsorption tower are connected with a vacuum pump respectively. The application sets two groups of volatile organic compound treatment lines (the first treatment line and the second treatment line) in parallel, so that the gas containing volatile organic compounds is alternately absorbed and adsorbed in the two groups of treatment lines. When one group of treatment line is used, the other group of treatment line is used for desorption of the desorption tower and desorption of the absorption tower, so that the adsorbent and the desorbent are used in a short cycle, and the gas containing volatile organic compounds is safely, quickly and efficiently enriched.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chemical manufacturing equipment and environmental protection technology, and particularly relates to a system and method for treating oil gas. BACKGROUND

[0002] During the storage and loading and unloading of oil products in a chemical production process, a large amount of gas containing volatile organic compounds (VOCs) is often generated, which is highly dispersed. The components of the gas are complex, and the molecular weights and physical properties of the components are greatly different. The methods for treating the gas containing volatile organic compounds generally include condensation, oxidation, absorption, adsorption and the like. The condensation method has strict requirements on the content of oil gas, and the lower the content of oil gas, the higher the energy consumption of condensation. The oxidation method also has strict requirements on the content of oil gas (the explosion limit needs to be considered), and also has the disadvantage of high energy consumption (when the content of oil gas is low, external fuel needs to be supplied). Therefore, it is very important to enrich oil gas by using the absorption method and the adsorption method. However, the absorption method has wide applicability, but the removal rate is limited, and it is difficult to directly meet the emission standard. The adsorption method commonly uses various porous materials (such as activated carbon and silica gel), and has the advantages of simple and safe process and high removal rate. However, the activated carbon material commonly used in the adsorption method is mainly microporous, and has poor recycling performance.

[0003] Therefore, it is urgent to realize safe, rapid and efficient enrichment of the gas containing volatile organic compounds. SUMMARY

[0004] In view of the above problems in the prior art, the present application provides a system and method for treating oil gas, which couples the absorption method and the adsorption method to realize the purpose of safe, rapid and efficient treatment of volatile organic compounds.

[0005] The specific application contents are as follows:

[0006] In a first aspect, the present application provides a system for treating oil gas, comprising: a pressurizing device, a first absorption tower, a second absorption tower, a first adsorption tower, a second adsorption tower, a vacuum pump and a liquid collecting tank.

[0007] The pressurizing device is connected to the first absorption tower and the second absorption tower respectively.

[0008] The first absorption tower and the first adsorption tower are connected in series to form a first treatment line.

[0009] The second absorption tower and the second adsorption tower are connected in series to form a second treatment line.

[0010] The first absorption tower and the second absorption tower are connected to the liquid collecting tank respectively.

[0011] The first adsorption tower and the second adsorption tower are connected to the vacuum pump respectively.

[0012] Optionally, the first absorption tower and the second absorption tower are filled with liquid hydrocarbon absorbent, the boiling point of which is 200-300℃, and the freezing point of which is -50- -10℃.

[0013] Optionally, the first absorption tower and the second absorption tower are filled with regenerable absorbent, the regenerable absorbent being one or more of carbon nanotube, graphene, acid clay, alumina, molecular sieve, activated carbon, and activated carbon fiber.

[0014] In a second aspect, the present application provides a method for treating oil and gas, which is applicable to the system of the first aspect, and the method comprises:

[0015] Step 1: connecting the booster to the first absorption tower and the second absorption tower respectively; connecting the first absorption tower and the first adsorption tower in series to form a first treatment line; connecting the second absorption tower and the second adsorption tower in series to form a second treatment line; connecting the first absorption tower and the second absorption tower to the liquid collecting tank respectively; and connecting the first adsorption tower and the second adsorption tower to the vacuum pump respectively;

[0016] Step 2: adding liquid hydrocarbon absorbent into the first absorption tower and the second absorption tower, and loading absorbent into the first adsorption tower and the second adsorption tower respectively, and disconnecting the passage between the booster and the second absorption tower, the passage between the first absorption tower and the second absorption tower and the liquid collecting tank, and the passage between the first adsorption tower and the second adsorption tower and the vacuum pump respectively;

[0017] Step 3: pressurizing the gas containing volatile organic compounds by the booster, and then introducing the gas into the first absorption tower through the oil and gas inlet, and performing absorption and adsorption treatment along the first treatment line, and detecting the content of volatile organic compounds in the treated gas at the first oil and gas outlet of the first adsorption tower;

[0018] Step 4: if the detection result at the first oil and gas outlet of the first adsorption tower is over standard, disconnecting the passage between the booster and the first absorption tower, switching the gas containing volatile organic compounds to the second treatment line for absorption and adsorption treatment, and detecting the content of volatile organic compounds in the treated gas at the first oil and gas outlet of the second adsorption tower, and at the same time, performing desorption treatment of volatile organic compounds on the first absorption tower and the first adsorption tower to complete regeneration;

[0019] Step 5: if the detection result at the first oil and gas outlet of the second adsorption tower is still over standard, disconnecting the passage between the booster and the second absorption tower, switching the gas containing volatile organic compounds to the first treatment line for absorption and adsorption treatment, and detecting the content of volatile organic compounds in the treated gas at the first oil and gas outlet of the first adsorption tower, and at the same time, performing desorption treatment of volatile organic compounds on the second absorption tower and the second adsorption tower to complete regeneration;

[0020] Step 6: Repeat steps 4-5 until the detection result at the first oil gas outlet of the first adsorption tower or the second adsorption tower is qualified.

[0021] Optionally, the absorption and adsorption treatment along the first processing line comprises: the pressurized volatile organic compound-containing gas enters the first absorption tower through the oil gas inlet of the first absorption tower, at -30-10℃ and 0.13-1.5 MPa, a part of the volatile organic compounds is absorbed by the liquid hydrocarbon absorbent in the first absorption tower, and the remaining volatile organic compound-containing gas enters the first adsorption tower through the oil gas inlet of the first adsorption tower after exiting the first absorption tower, at -30-10℃ and 0.12-1.48 MPa, the remaining volatile organic compounds are adsorbed by the adsorbent in the first adsorption tower.

[0022] Optionally, the absorption and adsorption treatment along the second processing line comprises: the pressurized volatile organic compound-containing gas enters the second absorption tower through the oil gas inlet of the second absorption tower, at -30-10℃ and 0.13-1.5 MPa, a part of the volatile organic compounds is absorbed by the liquid hydrocarbon absorbent in the second absorption tower, and the remaining volatile organic compound-containing gas enters the second adsorption tower through the oil gas inlet of the second adsorption tower after exiting the second absorption tower, at -30-10℃ and 0.12-1.48 MPa, the remaining volatile organic compounds are adsorbed by the adsorbent in the second adsorption tower.

[0023] Optionally, the volatile organic compound desorption treatment of the first absorption tower and the first adsorption tower comprises: disconnecting the passage between the first absorption tower and the first adsorption tower, connecting the passage between the first absorption tower and the liquid collection tank, heating the first absorption tower to 100℃ for 30-60 min to desorb the volatile organic compounds in the liquid hydrocarbon absorbent, and collecting them into the liquid collection tank.

[0024] Connecting the passage between the first adsorption tower and the vacuum pump, and filling a small amount of nitrogen into the nitrogen inlet of the first adsorption tower, using step-by-step vacuuming to desorb the volatile organic compounds adsorbed in the adsorbent, and collecting them into the vacuum pump.

[0025] Optionally, the volatile organic compound desorption treatment of the second absorption tower and the second adsorption tower comprises: disconnecting the passage between the second absorption tower and the second adsorption tower, connecting the passage between the second absorption tower and the liquid collection tank, heating the second absorption tower to 100℃ for 30-60 min to desorb the volatile organic compounds in the liquid hydrocarbon absorbent, and collecting them into the liquid collection tank.

[0026] Connecting the passage between the second adsorption tower and the vacuum pump, and filling a small amount of nitrogen into the nitrogen inlet of the second adsorption tower, using step-by-step vacuuming to desorb the volatile organic compounds adsorbed in the adsorbent, and collecting them into the vacuum pump.

[0027] Optionally, the step-by-step vacuum extraction mode comprises:

[0028] -20kPa to -30kPa for 5-10 minutes;

[0029] -60kPa to -75kPa for 5-10 minutes;

[0030] -90kPa to -95kPa for 5-10 minutes.

[0031] Optionally, the volatile organic compound-containing gas is composed of inert gas and volatile organic compound, the molecular weight of the volatile organic compound is 42-180, and the concentration is 0.01%-2%; the inert gas comprises one or more of nitrogen, argon and CO2.

[0032] The qualified detection result comprises that the content of organic compound in the volatile organic compound-containing gas is less than 50ppm, and the content of C5 compound is less than 4ppm.

[0033] Compared with the prior art, the present application has the following advantages:

[0034] The present application provides a system for treating oil and gas, comprising a booster device, a first absorption tower, a second absorption tower, a first adsorption tower, a second adsorption tower, a vacuum pump and a liquid collecting tank; wherein the booster device is connected with the first absorption tower and the second absorption tower respectively; the first absorption tower and the first adsorption tower are connected in series to form a first treatment line; the second absorption tower and the second adsorption tower are connected in series to form a second treatment line; the first absorption tower and the second absorption tower are connected with the liquid collecting tank respectively; and the first adsorption tower and the second adsorption tower are connected with the vacuum pump respectively. The present application comprises two groups of volatile organic compound treatment lines (the first treatment line and the second treatment line) in parallel, so that the volatile organic compound-containing gas is alternately treated by absorption and adsorption in the two groups of treatment lines. When one group of treatment line is treated, the other group of treatment line is treated by desorption of the desorption tower and desorption of the absorption tower, so that the adsorbent and the desorbent are used in a short cycle, and the volatile organic compound-containing gas is safely, quickly and efficiently enriched. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0036] Figure 1A system structure schematic diagram for processing oil and gas provided by an embodiment of the present application is shown.

[0037] Figure 2 A method flow chart for processing oil and gas provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, any person under the inspiration of the present application or combining the present application with other prior art features to obtain any product same or similar to the present application falls within the protection scope of the present application. In addition, all other embodiments obtained by the ordinary skilled in the art without carrying out creative labor fall within the protection scope of the present application.

[0039] The specific experimental steps or conditions not mentioned in the embodiments can be carried out according to the conventional experimental steps or conditions described in the prior art in the field. The reagents and other instruments not mentioned by the manufacturer are all conventional reagent products that can be obtained by purchase. In addition, the drawings are only schematic diagrams of the embodiments of the present application, and are not necessarily drawn to scale. The same reference signs in the drawings represent the same or similar parts, and thus repeated description thereof will be omitted. Some block diagrams shown in the drawings are functional entities, and do not necessarily correspond to physically or logically independent entities.

[0040] The technologies, methods and devices known to the ordinary skilled in the relevant field can not be discussed in detail, but under appropriate circumstances, the technologies, methods and devices should be regarded as part of the present application.

[0041] In the description of the present application, it should be understood that the use of the words "first", "second" and the like to qualify elements is only for the convenience of distinguishing the corresponding elements, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the protection scope of the present application.

[0042] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0043] Before the system and method for processing oil and gas provided by the present application are described in detail, it is necessary to make the following description of the related art:

[0044] Recently, mesoporous materials such as carbon nanotubes and graphene develop rapidly as adsorbents of volatile organic compounds, and can realize long-period cyclic use of adsorption and desorption, which is the most promising technology. However, the desorption treatment of volatile organic compounds on these materials is generally by heating, and the time spent for cooling after desorption is very long, which leads to a longer cycle of adsorbents that can be put into circulation, increases the cost of volatile organic compound enrichment treatment, and makes the enrichment treatment efficiency lower. In addition, the existing volatile organic compound enrichment treatment by absorption method or adsorption method has the problems of long time consumption, low efficiency and poor cyclic use performance of adsorbents / absorbents. Based on this, the present application hopes to build a system for efficiently treating oil and gas (volatile organic compounds), which couples the absorption device and the adsorption device to be used together in a system to realize the purpose of fast, efficient and safe enrichment of volatile organic compounds. The specific implementation content is as follows:

[0045] In a first aspect, the present application provides a system for treating oil and gas, Figure 1 The system structure schematic diagram of the system for treating oil and gas provided by the embodiment of the present application is shown in the figure, Figure 1 As shown in the figure, in the system, the booster device 1 is connected with the first absorption tower 2 and the second absorption tower 4 respectively, wherein the booster device 1 is used for pressurizing the gas containing volatile organic compounds, so as to facilitate the gas containing volatile organic compounds to enter the absorption tower smoothly and mix with the liquid hydrocarbon absorbent; the first absorption tower 2 and the first adsorption tower 3 are connected in series to form a first treatment line; the second absorption tower 4 and the second adsorption tower 5 are connected in series to form a second treatment line; the first absorption tower 2 and the second absorption tower 4 are connected with the liquid collecting tank 7 respectively, and the liquid collecting tank 7 is used for condensing and collecting the absorbed volatile organic compounds when the liquid hydrocarbon absorbent is desorbed; the first adsorption tower 3 and the second adsorption tower are connected with the vacuum pump 6 respectively; the vacuum pump 6 is used for vacuum desorption and regeneration of the adsorbed volatile organic compounds when the adsorbent is desorbed.

[0046] In the system for treating oil and gas provided by the present application, the first treatment line and the second treatment line both include absorption towers (2, 4) and adsorption towers, and the first treatment line and the second treatment line are connected in parallel, and the circulation treatment of the gas containing volatile organic compounds in the first treatment line and the second treatment line is completed by switching the passage between the absorption tower (2, 4) and the booster device 1. In addition, during the circulation treatment, the gas containing volatile organic compounds is absorbed and adsorbed along one of the treatment lines, while the absorption tower (2 or 4) and the adsorption tower (3 or 5) in the second treatment line are simultaneously desorbed, so that the adsorption and desorption are synchronized, the treatment process and time are effectively shortened, and the treatment efficiency is improved.

[0047] In addition, when the desorption treatment of the desorption tower and the desorption treatment of the desorption tower are carried out, the pipeline between the absorption tower and the adsorption tower is disconnected, and the absorption tower and the adsorption tower are independently operated without interference. The oil gas generated by high-temperature desorption of the absorption tower cannot be randomly transferred, and the safety of the system is improved.

[0048] Further, the vacuum desorption regeneration method of nitrogen desorption is adopted in the present application, compared with the technology of adsorbent heating desorption and temperature reduction, the regeneration time is shortened (50%-80%), the renewable energy consumption is reduced (30-50%); compared with the large amount of adsorbent washing desorption technology, no additional pipeline needs to be built, and the adaptability to the components in the oil gas is stronger, and the desorption cost can be effectively reduced (5%-20%).

[0049] In a second aspect, the present application provides a method for treating oil gas, which is suitable for the system of the first aspect, Figure 2 The flow chart of the method for treating oil gas provided by the embodiment of the present application is shown as follows, Figure 2 As shown in the figure, the method comprises:

[0050] Step 2: liquid hydrocarbon absorbent is added into the first absorption tower and the second absorption tower, the adsorbent is loaded into the first adsorption tower and the second adsorption tower respectively, and the passage between the booster device and the second absorption tower, the passages between the first absorption tower, the second absorption tower and the liquid collecting tank, and the passages between the first adsorption tower, the second adsorption tower and the vacuum pump are disconnected;

[0051] Step 3: the gas containing volatile organic compounds is pressurized by the booster device, enters the first absorption tower through the oil gas inlet, and is absorbed and adsorbed along the first treatment line, and the content of volatile organic compounds in the treated gas is detected at the first oil gas outlet of the first adsorption tower;

[0052] Step 4: if the detection result at the first oil gas outlet of the first adsorption tower is over standard, the passage between the booster device and the first absorption tower is disconnected, the gas containing volatile organic compounds is switched to the second treatment line for absorption and adsorption treatment, and the content of volatile organic compounds in the treated gas is detected at the first oil gas outlet of the second adsorption tower, and at the same time, the desorption treatment of volatile organic compounds is carried out on the first absorption tower and the first adsorption tower to complete the regeneration;

[0053] Step 5: if the detection result at the first oil gas outlet of the second adsorption tower is still over standard, the passage between the booster device and the second absorption tower is disconnected, the gas containing volatile organic compounds is switched to the first treatment line for absorption and adsorption treatment, and the content of volatile organic compounds in the treated gas is detected at the first oil gas outlet of the first adsorption tower, and at the same time, the desorption treatment of volatile organic compounds is carried out on the second absorption tower and the second adsorption tower to complete the regeneration;

[0054] Step 6: Repeat Step 4-Step 5 until the test results at the first oil and gas outlet of the first adsorption tower or the second adsorption tower are qualified.

[0055] The following Figure 1 The system schematic diagram shown analyzes the method for processing oil and gas, see Figure 1 , the first absorption tower 2, the second absorption tower 4 are filled with liquid hydrocarbon absorbent respectively, the boiling point is 200-300℃, the freezing point is -50~-10℃; the first adsorption tower 3, the second adsorption tower 5 are filled with renewable adsorbent respectively, the renewable adsorbent is one or more of carbon nanotube, graphene, acid clay, alumina, molecular sieve, activated carbon, activated carbon fiber. Before the system starts, disconnect the passage between the pressure increasing device 1 and the second absorption tower 4, disconnect the passage between the first absorption tower 2, the second absorption tower 4 and the liquid collecting tank 7 respectively, disconnect the passage between the first adsorption tower 3, the second adsorption tower 5 and the vacuum pump 6 respectively, keep the passage between the pressure increasing device 1-the first absorption tower 2-the first adsorption tower 3, the gas containing volatile organic matter enters the pressure increasing device 1 through the oil and gas inlet 8, and then is discharged from the oil and gas outlet 9 of the pressure increasing device 1 after being pressurized, then enters the first absorption tower 2 through the oil and gas inlet 10, at -30℃-10℃, 0.13MPa-1.5MPa, the absorption rate of volatile organic matter is about 95%. The remaining small amount of oil and gas is discharged from the oil and gas outlet 12 of the first absorption tower 2 with the gas, and is introduced into the first adsorption tower 3 through the oil and gas inlet 15 of the first adsorption tower 3, at -30℃-10℃, 0.12MPa-1.48MPa, the organic matter is adsorbed on the adsorbent in the first adsorption tower 3. The oil and gas that has passed the treatment is discharged from the first oil and gas outlet 17 of the first adsorption tower 3.

[0056] Continue to see Figure 1, if the oil and gas content in the gas at the first oil and gas outlet 17 of the first adsorption tower 3 is detected to be over the standard, the pipeline between the oil and gas outlet 9 of the booster 1 and the oil and gas inlet 10 of the first absorption tower 2 is disconnected, and the booster 1-second absorption tower 4-second adsorption tower 5 series operation (second processing line) is switched. The gas containing volatile organic compounds is discharged from the oil and gas outlet 9 of the booster 1, then enters the second absorption tower 4 through the oil and gas inlet 11 of the second absorption tower 4, and under the same conditions as the first absorption tower 2, most of the oil and gas is changed to liquid after passing through the liquid hydrocarbon absorbent, and a small amount of oil and gas is discharged from the oil and gas outlet 13 of the second absorption tower 4, then enters the second adsorption tower 5 through the oil and gas inlet 16 of the second adsorption tower 5, and under the same conditions as the first adsorption tower 3, the oil and gas in the gas is adsorbed on the adsorbent. The qualified oil and gas is discharged from the first oil and gas outlet 18 of the second adsorption tower 5. At the same time, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 15 of the first adsorption tower 3 is closed, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 14 of the liquid collection tank 7 is opened, the first absorption tower 2 is heated to 100°C, and the oil and gas in the absorbent is heated and desorbed into the liquid collection tank 7. After the temperature rises to 100°C, it is maintained for 30-60 minutes, then the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 14 of the liquid collection tank 7 is disconnected, and the regeneration of the first absorption tower 2 is stopped; the pipeline between the second oil and gas outlet 19 of the first adsorption tower 3 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen gas (1-20 Nm 3 / h) is supplied to the first adsorption tower 3 from the nitrogen inlet 23. In a step-by-step vacuum pumping manner (5-10 min at -20 kPa to -30 kPa; 5-10 min at -60 kPa to -75 kPa; 5-10 min at -90 kPa to -95 kPa), the volatile organic compounds adsorbed in the adsorbent are desorbed into the vacuum pump 6, then discharged from the oil and gas outlet 22 of the vacuum pump 6, and returned to the oil and gas inlet 8 of the booster. Then the pipeline between the second oil and gas outlet 19 of the first adsorption tower 3 and the oil and gas inlet 21 of the vacuum pump 6 is disconnected, and the regeneration of the first adsorption tower 3 is stopped.

[0057] Continuing to refer to Figure 1If the oil and gas content in the gas at the first oil and gas outlet 18 of the second adsorption tower 5 is also found to exceed the standard, the pipeline between the oil and gas outlet 9 of the booster device 1 and the oil and gas inlet 11 of the second absorption tower 4 is closed, and the operation is switched to a series operation of booster device 1-first absorption tower 2-first adsorption tower 3 for absorption and adsorption treatment (the same as the absorption and adsorption treatment process in step 2). At the same time, the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 16 of the second adsorption tower 5 is closed, and the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 14 of the collection tank 7 is opened. The oil and gas absorbed by the second absorption tower 2 is collected in the same way as when the first absorption tower 2 is collected. The pipeline between the second oil and gas outlet 20 of the second adsorption tower 5 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen is introduced into the second adsorption tower 5 from the nitrogen inlet 24. Using the same vacuuming method as during desorption in the first adsorption tower 3, the oil and gas adsorbent in the second adsorption tower 5 is desorbed, enters the vacuum pump 6, and then exits from the oil and gas outlet 22 of the vacuum pump 6, returning to the oil and gas inlet 8 of the pressurization unit. Steps 3-4 above are repeated continuously until the test results at the first oil and gas outlet (17 or 18) of the first adsorption tower 3 or the second adsorption tower 5 are satisfactory.

[0058] In some embodiments, the gas containing volatile organic compounds is composed of an inert gas and volatile organic compounds, wherein the molecular weight of the volatile organic compounds is 42-180 and the concentration is 0.01%-2%; the inert gas includes one or more of nitrogen, argon and CO2; the qualified test result includes: the organic matter content in the gas containing volatile organic compounds is less than 50 ppm, and the C5 and above compounds are less than 4 ppm.

[0059] To enable those skilled in the art to more clearly understand the present invention, the following embodiments will be used to provide a detailed description of a system and method for processing oil and gas according to the present invention.

[0060] The following examples are all based on Figure 1 The connection relationship shown in the structural diagram connects the pressurizing device 1 to the first absorption tower 2 and the second absorption tower 4 respectively; the first absorption tower 2 and the first adsorption tower 3 are connected in series to form the first absorption-adsorption treatment line; the second absorption tower 4 and the second adsorption tower 5 are connected in series to form the second absorption-adsorption treatment line; the first absorption tower 2 and the second absorption tower 4 are connected to the liquid collection tank 7 respectively; the first adsorption tower 3 and the second adsorption tower 5 are connected to the vacuum pump 6 respectively to form a complete system.

[0061] Example 1

[0062] Step 1, press Figure 1The connection relationship shown in the structural schematic diagram completes the system assembly, and the liquid hydrocarbon absorbent (boiling point 200-250°C, freezing point -50 to -30°C) is added to the first absorption tower 2 and the second absorption tower 4. The adsorbent (30% activated carbon and 70% graphene) is loaded in the first adsorption tower 3 and the second adsorption tower 5.

[0063] Step 2, first disconnect the access between the pressure increasing device and the second absorption tower 4, disconnect the access between the first absorption tower 2 and the second absorption tower 4 and the liquid collecting tank 7 respectively, disconnect the access between the first adsorption tower 3 and the second adsorption tower 5 and the vacuum pump 6 respectively, use the first absorption-adsorption treatment line formed by the pressure increasing device 1-first absorption tower 2-first adsorption tower 3 in series, and the gas containing volatile organic matter (mainly nitrogen, organic matter 2%, C4-C10 hydrocarbon) enters the first absorption tower 2 through the oil gas inlet 10 of the first absorption tower 2 after being pressurized through the oil gas inlet 8 of the pressure increasing device 1, and then the oil gas outlet 9 of the pressure increasing device 1, then enters the first absorption tower 2 through the oil gas inlet 10, and the absorption rate is 95% under the operation condition of temperature -30°C and pressure 1.5 MPa (absolute pressure). A small amount of oil gas is discharged from the oil gas outlet 12 of the first absorption tower 2 along with the gas, enters the first adsorption tower 3 through the oil gas inlet 15 of the first adsorption tower 3, and the adsorption temperature is -30°C and the pressure is 1.48 MPa (absolute pressure), and the organic matter is adsorbed on the adsorbent in the first adsorption tower 3. The treated oil gas (nitrogen, non-methane total hydrocarbon 15 ppm, aromatic hydrocarbon 0 ppm) is discharged from the first oil gas outlet 17 of the first adsorption tower 3.

[0064] Step 3, if the oil and gas content in the gas at the first oil and gas outlet 17 of the first adsorption tower 3 is detected to be over the standard, the pipeline between the oil and gas outlet 9 of the booster device 1 and the oil and gas inlet 10 of the first absorption tower 2 is closed, and the booster device 1-second absorption tower 4-second adsorption tower 5 in series is switched to operate (second absorption-adsorption processing line). The gas containing volatile organic compounds is discharged from the oil and gas outlet 9 of the booster device 1, then enters the second absorption tower 4 through the oil and gas inlet 11 of the second absorption tower 4, and under the same conditions as the first absorption tower 2, most of the oil and gas is changed into liquid after passing through the liquid hydrocarbon absorbent, and a small amount of oil and gas is discharged from the oil and gas outlet 13 of the second absorption tower 4, then enters the second adsorption tower 5 through the oil and gas inlet 16 of the second adsorption tower 5, and under the same conditions as the first adsorption tower 3, the oil and gas in the gas is adsorbed on the adsorbent. The treated oil and gas is discharged from the first oil and gas outlet 18 of the second adsorption tower 5. At the same time, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 15 of the first adsorption tower 3 is closed, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 14 of the liquid collecting tank 7 is opened, the first absorption tower 2 is heated to 100°C, and the oil and gas in the absorbent is heated and desorbed into the liquid collecting tank 7. After the temperature rises to 100°C, it is maintained for 60 minutes, and the regeneration of the first absorption tower 2 is stopped; the pipeline between the second oil and gas outlet 19 of the first adsorption tower 3 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen gas (2Nm 3 / h) is supplied to the first adsorption tower 3 from the nitrogen gas inlet 23. In the way of step-by-step vacuumizing, it is first vacuumized at -20kPa for 10 minutes, then at -60Pa for 5 minutes, and then at -90kPa for 10 minutes. The oil and gas of the adsorbent in the first adsorption tower 3 is desorbed, enters the vacuum pump 6, is discharged from the oil and gas outlet 22 of the vacuum pump 6, and returns to the oil and gas inlet 8 of the booster device. Then the regeneration of the first adsorption tower 3 is stopped.

[0065] Step 4, if the oil and gas content in the gas at the first oil and gas outlet 18 of the second adsorption tower 5 is detected to be over the standard, the pipeline between the oil and gas outlet 9 of the booster device 1 and the oil and gas inlet 11 of the second absorption tower 4 is closed, and the booster device 1-first absorption tower 2-first adsorption tower 3 in series is switched to operate for absorption and adsorption processing (the same as the absorption and adsorption processing process in step 2). At the same time, the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 16 of the second adsorption tower 5 is closed, the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 14 of the liquid collecting tank 7 is opened, and the oil and gas absorbed by the second absorption tower 2 is desorbed in the same way as the first absorption tower 2; the pipeline between the second oil and gas outlet 20 of the second adsorption tower 5 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen gas (2Nm 3h). The oil gas of the adsorbent in the second adsorption tower 5 is desorbed in the same way of vacuumizing as the first adsorption tower 3, and enters the vacuum pump 6, and then from the oil gas outlet 22 of the vacuum pump 6, returns to the oil gas inlet 8 of the booster device.

[0066] Step 5, repeat the above steps 3-4, the oil gas treatment operation can be continuous.

[0067] Example 2

[0068] Step 1, according to the connection relationship shown in the structural schematic diagram, complete the system assembly, and add liquid hydrocarbon absorbent (boiling point 200-300℃, freezing point -30~-15℃) into the first absorption tower 2 and the second absorption tower 4. The adsorbent (mass fraction 20% activated carbon, 60% activated carbon fiber and 20% carbon nanotube) is filled in the first adsorption tower 3 and the second adsorption tower 5. Figure 1 Step 2, first disconnect the passage between the booster device and the second absorption tower 4, disconnect the passage between the first absorption tower 2 and the second absorption tower 4 and the liquid collecting tank 7 respectively, disconnect the passage between the first adsorption tower 3 and the second adsorption tower 5 and the vacuum pump 6 respectively; the first absorption-adsorption treatment line formed by the booster device 1-first absorption tower 2-first adsorption tower 3 in series is adopted. The gas containing volatile organic matter (mainly nitrogen, organic matter is 0.5% gasoline hydrocarbon) enters the booster device 1 through the oil gas inlet 8 of the booster device 1, and then from the oil gas outlet 9 of the booster device 1 after pressurization, then enters the first absorption tower 2 through the oil gas inlet 10, the absorption temperature is 10℃, the pressure is 1.20MPa (absolute pressure), and the absorption rate is 75%. A small amount of oil gas is discharged from the oil gas outlet 12 of the first absorption tower 2 with the gas, and enters the first adsorption tower 3 through the oil gas inlet 15 of the first adsorption tower 3, the adsorption temperature is 10℃, the pressure is 1.18MPa (absolute pressure), and the organic matter is adsorbed on the adsorbent in the first adsorption tower 3. The treated oil gas (nitrogen, non-methane total hydrocarbon 30ppm, aromatic hydrocarbon 2ppm) is discharged from the first oil gas outlet 17 of the first adsorption tower 3.

[0069]

[0070] ​Step 3, if the oil and gas content in the gas at the first oil and gas outlet 17 of the first adsorption tower 3 is detected to be over the standard, switch to the series operation of the pressurizing device 1 - the second absorption tower 4 - the second adsorption tower 5 (the second absorption-adsorption processing line). The gas containing volatile organic compounds enters the pressurizing device 1 through the oil and gas inlet 8, is pressurized and then discharged from the oil and gas outlet 9 of the pressurizing device 1, and then enters the second absorption tower 4 through the oil and gas inlet 11 of the second absorption tower 4. Under the same conditions as the first absorption tower 2, most of the oil and gas is changed into liquid after passing through the liquid hydrocarbon absorbent, and a small amount of oil and gas is discharged from the oil and gas outlet 13 of the second absorption tower 4 along with the gas, and then enters the second adsorption tower 5 through the oil and gas inlet 16 of the second adsorption tower 5. Under the same conditions as the first adsorption tower 3, the oil and gas in the gas is adsorbed on the adsorbent. The oil and gas that meets the processing standard is discharged from the first oil and gas outlet 18 of the second adsorption tower 5; at the same time, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 15 of the first adsorption tower 3 is closed, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 14 of the liquid collecting tank 7 is opened, the first absorption tower 2 is heated to 100°C, and the oil and gas in the absorbent is heated and desorbed into the liquid collecting tank 7. After the temperature rises to 100°C, it is maintained for 60 minutes, and the regeneration of the first absorption tower 2 is stopped; the pipeline between the second oil and gas outlet 19 of the first adsorption tower 3 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen gas (1 Nm 3 / h) is supplied to the first adsorption tower 3 from the nitrogen gas inlet 23. In the way of step-by-step vacuumizing, it is vacuumized at -30 kPa for 10 minutes, then at -60 Pa for 10 minutes, and then at -90 kPa for 10 minutes. The oil and gas of the adsorbent in the first adsorption tower 3 is desorbed, enters the vacuum pump 6, is discharged from the oil and gas outlet 22 of the vacuum pump 6, and returns to the oil and gas inlet 8 of the pressurizing device. Then the regeneration of the first adsorption tower 3 is stopped.

[0071] Step 4, if the oil and gas content in the gas at the first oil and gas outlet 18 of the second adsorption tower 5 is detected to be over the standard, the pipeline between the oil and gas outlet 9 of the pressurizing device 1 and the oil and gas inlet 11 of the second absorption tower 4 is closed, and the series operation of the pressurizing device 1 - the first absorption tower 2 - the first adsorption tower 3 is switched to carry out the absorption and adsorption processing (the same as the absorption and adsorption processing in step 2). At the same time, the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 16 of the second adsorption tower 5 is closed, the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 14 of the liquid collecting tank 7 is opened, and the oil and gas absorbed by the second absorption tower 2 is desorbed in the same way as the first absorption tower 2; the pipeline between the second oil and gas outlet 20 of the second adsorption tower 5 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen gas (1 Nm 3h). The oil gas of the adsorbent in the second adsorption tower 5 is desorbed in the same way as the first adsorption tower 3 desorbs, into the vacuum pump 6, and from the oil gas outlet 2 of the vacuum pump 6 back to the oil gas inlet 8 of the booster device.

[0072] Step 5, repeat the above steps 3-4, the oil gas treatment operation can be continuous.

[0073] Example 3

[0074] Step 1, step 1, according to Figure 1 The connection relationship shown in the structural diagram is completed, and the liquid hydrocarbon absorbent (boiling point 200-300℃, freezing point -30~-10℃) is added to the first absorption tower 2 and the second absorption tower 4. The adsorbent (50% carbon nanotubes and 50% acid clay) is filled in the first adsorption tower 3 and the second adsorption tower 5.

[0075] Step 2, first disconnect the booster device and the second absorption tower 4, disconnect the first absorption tower 2, the second absorption tower 4 and the liquid collecting tank 7, disconnect the first adsorption tower 3, the second adsorption tower 5 and the vacuum pump 6, and form a first absorption-adsorption treatment line in series with the booster device 1-first absorption tower 2-first adsorption tower 3. The gas containing volatile organic matter (mainly nitrogen, organic matter is 0.5% of pentane, cyclohexene, cyclohexane, cyclohexanol, benzene, cyclohexanone, any proportion of mixture) enters the booster device 1 through the oil gas inlet 8 of the booster device 1, and after pressurization, the oil gas outlet 9 of the booster device 1, then through the oil gas inlet 10 into the first absorption tower 2, the absorption temperature is-10℃, the pressure is 0.13MPa (absolute pressure), the absorption rate is 90%. A small amount of oil gas is discharged from the oil gas outlet 12 of the first absorption tower 2 along with the gas, and is introduced into the first adsorption tower 3 through the oil gas inlet 15 of the first adsorption tower 3, the adsorption temperature is-10℃, the pressure is 0.12MPa (absolute pressure), and the organic matter is adsorbed on the adsorbent in the first adsorption tower 3. The treated oil gas (nitrogen, non-methane hydrocarbon 20ppm, aromatic hydrocarbon 2ppm) is discharged from the first oil gas outlet 17 of the first adsorption tower 3.

[0076] Step 3, if the oil and gas content in the gas at the first oil and gas outlet 17 of the first adsorption tower 3 is detected to be over the standard, switch to the series operation of the pressurizing device 1 - the second absorption tower 4 - the second adsorption tower 5 (the second absorption-adsorption processing line). The gas containing volatile organic compounds enters the pressurizing device 1 through the oil and gas inlet 8, is pressurized and then discharged from the oil and gas outlet 9 of the pressurizing device 1, and then enters the second absorption tower 4 through the oil and gas inlet 11 of the second absorption tower 4. Under the same conditions as the first absorption tower 2, most of the oil and gas is changed into liquid after passing through the liquid hydrocarbon absorbent, and a small amount of oil and gas is discharged from the oil and gas outlet 13 of the second absorption tower 4 along with the gas, and then enters the second adsorption tower 5 through the oil and gas inlet 16 of the second adsorption tower 5. Under the same conditions as the first adsorption tower 3, the oil and gas in the gas is adsorbed on the adsorbent. The oil and gas that meets the processing standard is discharged from the first oil and gas outlet 18 of the second adsorption tower 5; at the same time, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 15 of the first adsorption tower 3 is closed, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 14 of the liquid collecting tank 7 is opened, the first absorption tower 2 is heated to 100°C, and the oil and gas in the absorbent is heated and desorbed into the liquid collecting tank 7. After the temperature rises to 100°C, it is maintained for 40 minutes, and the regeneration of the first absorption tower 2 is stopped; the pipeline between the second oil and gas outlet 19 of the first adsorption tower 3 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen gas (10 Nm 3 / h) is supplied to the first adsorption tower 3 from the nitrogen gas inlet 23. In the way of step-by-step vacuumizing, it is first vacuumized at -25 kPa for 8 minutes, then at -70 kPa for 8 minutes, and then at -92 kPa for 8 minutes. The oil and gas of the adsorbent in the first adsorption tower 3 is desorbed, enters the vacuum pump 6, is discharged from the oil and gas outlet 22 of the vacuum pump 6, and returns to the oil and gas inlet 8 of the pressurizing device. Then the regeneration of the first adsorption tower 3 is stopped.

[0077] Step 4, if the oil and gas content in the gas at the first oil and gas outlet 18 of the second adsorption tower 5 is detected to be over the standard, the pipeline between the oil and gas outlet 9 of the pressurizing device 1 and the oil and gas inlet 11 of the second absorption tower 4 is closed, and the series operation of the pressurizing device 1 - the first absorption tower 2 - the first adsorption tower 3 is switched to carry out the absorption and adsorption processing (the same as the absorption and adsorption processing process in step 2). At the same time, the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 16 of the second adsorption tower 5 is closed, the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 14 of the liquid collecting tank 7 is opened, and the oil and gas absorbed by the second absorption tower 2 is desorbed in the same way as the first absorption tower 2; the pipeline between the second oil and gas outlet 20 of the second adsorption tower 5 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen gas (10 Nm 3h). The oil gas of the adsorbent in the second adsorption tower 5 is desorbed in the same way as the first adsorption tower 3 desorbs, into the vacuum pump 6, and from the oil gas outlet 22 of the vacuum pump 6 back to the oil gas inlet 8 of the booster device.

[0078] Step 5, repeat the above steps 3-4, the oil gas treatment operation can be continuous.

[0079] Example 4

[0080] Step 1, according to Figure 1 The connection relationship shown in the structural diagram is completed, and the liquid hydrocarbon absorbent (boiling point 250-300℃, freezing point -30~ -10℃) is added to the first absorption tower 2 and the second absorption tower 4. The adsorbent (50% carbon nanotubes and 50% acid clay) is loaded in the first adsorption tower 3 and the second adsorption tower 5.

[0081] Step 2, first disconnect the booster device and the second absorption tower 4, disconnect the first absorption tower 2 and the second absorption tower 4 and the liquid collecting tank 7, disconnect the first adsorption tower 3 and the second adsorption tower 5 and the vacuum pump 6; The first absorption-adsorption treatment line formed by the booster device 1-first absorption tower 2-first adsorption tower 3 in series. The gas containing volatile organic compounds (mainly Ar. Volatile organic compounds include 0.02% C4-C5 isomeric alkanes, pyridine, toluene, and furan in any proportion) enters the booster device 1 through the oil gas inlet 8, and after pressurization, the oil gas outlet 9 of the booster device 1, then through the oil gas inlet 10 into the first absorption tower 2, the absorption temperature is -5℃, the pressure is 0.15MPa (absolute pressure), the absorption rate is 90%. A small amount of oil gas is discharged from the oil gas outlet 12 of the first absorption tower 2 along with the gas, and is introduced into the first adsorption tower 3 through the oil gas inlet 15 of the first adsorption tower 3, the adsorption temperature is -10℃, the pressure is 0.13MPa (absolute pressure), and the organic matter is adsorbed on the adsorbent in the first adsorption tower 3. The treated oil gas (nitrogen, non-methane hydrocarbon 20ppm, aromatic hydrocarbon 0ppm) is discharged from the first oil gas outlet 17 of the first adsorption tower 3.

[0082] Step 3, if the oil and gas content in the gas at the first oil and gas outlet 17 of the first adsorption tower 3 is detected to be over the standard, the pipeline between the oil and gas outlet 9 of the booster device 1 and the oil and gas inlet 10 of the first absorption tower 2 is closed, and the booster device 1-second absorption tower 4-second adsorption tower 5 in series is switched to operate (second absorption-adsorption processing line). The gas containing volatile organic compounds is discharged from the oil and gas outlet 9 of the booster device 1, then enters the second absorption tower 4 through the oil and gas inlet 11 of the second absorption tower 4, and under the same conditions as the first absorption tower 2, most of the oil and gas is changed into liquid after passing through the liquid hydrocarbon absorbent, and a small amount of oil and gas is discharged from the oil and gas outlet 13 of the second absorption tower 4, then enters the second adsorption tower 5 through the oil and gas inlet 16 of the second adsorption tower 5, and under the same conditions as the first adsorption tower 3, the oil and gas in the gas is adsorbed on the adsorbent. The treated oil and gas is discharged from the first oil and gas outlet 18 of the second adsorption tower 5. At the same time, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 15 of the first adsorption tower 3 is closed, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 14 of the liquid collecting tank 7 is opened, the first absorption tower 2 is heated to 100°C, and the oil and gas in the absorbent is heated and desorbed into the liquid collecting tank 7. After the temperature rises to 100°C, it is maintained for 50 minutes, and the regeneration of the first absorption tower 2 is stopped; the pipeline between the second oil and gas outlet 19 of the first adsorption tower 3 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen gas (5 Nm 3 / h) is supplied to the first adsorption tower 3 from the nitrogen gas inlet 23. In the way of step-by-step vacuumizing, it is first vacuumized at -25 kPa for 5 minutes, then at -65 kPa for 5 minutes, and then at -90 kPa for 5 minutes. The oil and gas of the adsorbent in the first adsorption tower 3 is desorbed, enters the vacuum pump 6, is discharged from the oil and gas outlet 22 of the vacuum pump 6, and returns to the oil and gas inlet 8 of the booster device. Then the regeneration of the first adsorption tower 3 is stopped.

[0083] Step 4, if the oil and gas content in the gas at the first oil and gas outlet 18 of the second adsorption tower 5 is detected to be over the standard, the pipeline between the oil and gas outlet 9 of the booster device 1 and the oil and gas inlet 11 of the second absorption tower 4 is closed, and the booster device 1-first absorption tower 2-first adsorption tower 3 in series is switched to operate for absorption and adsorption processing (the same as the absorption and adsorption processing process in step 2). At the same time, the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 16 of the second adsorption tower 5 is closed, the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 14 of the liquid collecting tank 7 is opened, and the oil and gas absorbed by the second absorption tower 2 is desorbed in the same way as the first absorption tower 2; the pipeline between the second oil and gas outlet 20 of the second adsorption tower 5 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen gas (5 Nm 3 / h). Using the same vacuuming method as during the desorption of the first adsorption tower 3, the oil and gas of the adsorbent in the second adsorption tower 5 are desorbed, enter the vacuum pump 6, and then exit from the oil and gas outlet 22 of the vacuum pump 6, returning to the oil and gas inlet 8 of the booster unit.

[0084] Step 5: Repeat steps 3-4 above until the test results at the oil and gas outlet of the first adsorption tower or the second adsorption tower are qualified, and the oil and gas treatment operation can be carried out continuously.

[0085] Example 5

[0086] Step 1, press Figure 1 The connection relationship shown in the structural diagram completes the system assembly, and the liquid hydrocarbon absorbent (boiling point 220-260℃, freezing point -40~-25℃) is added to the first absorption tower 2 and the second absorption tower 4. The first adsorption tower 3 and the second adsorption tower 5 are filled with adsorbent (50% carbon nanotubes, 30% alumina and 20% molecular sieve by mass fraction).

[0087] Step 2: First, disconnect the passage between the booster device and the second absorption tower 4; disconnect the passages between the first absorption tower 2 and the second absorption tower 4 and the collection tank 7 respectively; disconnect the passages between the first adsorption tower 3 and the second adsorption tower 5 and the vacuum pump 6 respectively; adopt the first absorption-adsorption treatment circuit formed by the booster device 1, the first absorption tower 2, and the first adsorption tower 3 connected in series. Gas containing volatile organic compounds (mainly CO2, 0.5% octane, ethyl tert-butyl ether, benzene, toluene, and any proportion of organic compounds with boiling points of 120-140℃) enters the booster device 1 through the oil and gas inlet 8, is pressurized, exits from the booster device 1 through the oil and gas outlet 9, and then enters the first absorption tower 2 through the oil and gas inlet 10. The absorption temperature is 5℃, the pressure is 0.4MPa (absolute pressure), and the absorption rate is 75%. A small amount of oil and gas exits from the oil and gas outlet 12 of the first absorption tower 2 and enters the first adsorption tower 3 through the oil and gas inlet 15. The adsorption temperature is -5℃ and the pressure is 0.38MPa (absolute pressure). The organic matter is adsorbed onto the adsorbent inside the first adsorption tower 3. The treated oil and gas (nitrogen, containing 25ppm non-methane total hydrocarbons and 0ppm aromatics) is discharged from the first oil and gas outlet 17 of the first adsorption tower 3.

[0088] Step 3, if the oil and gas content in the gas at the first oil and gas outlet 17 of the first adsorption tower 3 is detected to be over the standard, the pipeline between the oil and gas outlet 9 of the pressurizing device 1 and the oil and gas inlet 10 of the first absorption tower 2 is closed, and the pressurizing device 1-second absorption tower 4-second adsorption tower 5 series operation (second absorption-adsorption processing line) is switched. The gas containing volatile organic compounds is discharged from the oil and gas outlet 9 of the pressurizing device 1, then enters the second absorption tower 4 through the oil and gas inlet 11 of the second absorption tower 4, and under the same conditions as the first absorption tower 2, most of the oil and gas is changed into liquid after passing through the liquid hydrocarbon absorbent, and a small amount of oil and gas is discharged from the oil and gas outlet 13 of the second absorption tower 4, then enters the second adsorption tower 5 through the oil and gas inlet 16 of the second adsorption tower 5, and under the same conditions as the first adsorption tower 3, the oil and gas in the gas is adsorbed on the adsorbent. The qualified oil and gas is discharged from the first oil and gas outlet 18 of the second adsorption tower 5. At the same time, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 15 of the first adsorption tower 3 is closed, the pipeline between the oil and gas outlet 12 of the first absorption tower 2 and the oil and gas inlet 14 of the liquid collecting tank 7 is opened, the first absorption tower 2 is heated to 100°C, the oil and gas in the absorbent is heated and desorbed into the liquid collecting tank 7. After the temperature rises to 100°C, it is maintained for 45 minutes, and the regeneration of the first absorption tower 2 is stopped; the pipeline between the second oil and gas outlet 19 of the first adsorption tower 3 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen gas (1 Nm 3 / h) is supplied to the first adsorption tower 3 from the nitrogen inlet 23. In the way of step-by-step vacuumizing, it is vacuumized at -30 kPa for 10 minutes, then at -60 kPa for 10 minutes, and then at -95 kPa for 10 minutes. The oil and gas of the adsorbent in the first adsorption tower 3 is desorbed, enters the vacuum pump 6, is discharged from the oil and gas outlet 22 of the vacuum pump 6, and returns to the oil and gas inlet 8 of the pressurizing device. Then the regeneration of the first adsorption tower 3 is stopped.

[0089] Step 4, if the oil and gas content in the gas at the first oil and gas outlet 18 of the second adsorption tower 5 is detected to be over the standard, the pipeline between the oil and gas outlet 9 of the pressurizing device 1 and the oil and gas inlet 11 of the second absorption tower 4 is closed, and the pressurizing device 1-first absorption tower 2-first adsorption tower 3 series operation is switched for absorption and adsorption processing (the same as the absorption and adsorption processing process in step 2). At the same time, the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 16 of the second adsorption tower 5 is closed, the pipeline between the oil and gas outlet 13 of the second absorption tower 4 and the oil and gas inlet 14 of the liquid collecting tank 7 is opened, and the oil and gas absorbed by the second absorption tower 2 is desorbed in the same way as the first absorption tower 2; the pipeline between the second oil and gas outlet 20 of the second adsorption tower 5 and the oil and gas inlet 21 of the vacuum pump 6 is opened, and a small amount of nitrogen gas (1 Nm 3(h). The oil gas of the adsorbent of the second adsorption tower 5 is desorbed in the same way of vacuumizing as the first adsorption tower 3, and enters the vacuum pump 6, and then from the oil gas outlet 22 of the vacuum pump 6, returns to the oil gas inlet 8 of the booster device.

[0090] Step 5, repeat the above steps 3-4, the oil gas treatment operation can be continuous.

[0091] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0092] For the method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the order of the described actions, because according to the present application, certain steps can be performed in other order or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and components involved are not necessarily necessary for the present application.

[0093] The above describes in detail the system and method for treating oil gas provided by the present application, and the specific examples are applied in the present application to explain the principles and implementation modes of the present application. The above embodiment description is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed; in summary, the content of the present specification should not be understood as a limitation of the present application.

Claims

1. A method for processing oil and gas, characterized in that, The method is performed by an oil and gas processing system, which includes: a pressurization device, a first processing line and a second processing line connected in parallel, a vacuum pump and a liquid collection tank; The first processing line consists of a first absorption tower and a first adsorption tower connected in series. The second processing line consists of a second absorption tower and a second adsorption tower connected in series; The pressurization device is connected to the first absorption tower and the second absorption tower respectively; The first absorption tower and the second absorption tower are respectively connected to the liquid collection tank; The first adsorption tower and the second adsorption tower are respectively connected to the vacuum pump; The method includes: Step 1: Add liquid hydrocarbon absorbent to the first and second absorption towers, load the adsorbent into the first and second absorption towers respectively, and disconnect the passage between the pressurization device and the second absorption tower, the passage between the first and second absorption towers and the collection tank respectively, and the passage between the first and second absorption towers and the vacuum pump respectively. Step 2: The gas containing volatile organic compounds is pressurized by the booster device and enters the oil and gas inlet of the first absorption tower. It is absorbed and adsorbed along the first processing line, and the content of volatile organic compounds in the treated gas is detected at the first oil and gas outlet of the first adsorption tower. Step 3: If the test result at the first oil and gas outlet of the first adsorption tower exceeds the standard, disconnect the passage between the booster device and the first absorption tower, switch the gas containing volatile organic compounds to the second processing line for absorption and adsorption treatment, and test the content of volatile organic compounds in the treated gas at the first oil and gas outlet of the second adsorption tower. At the same time, perform desorption treatment of volatile organic compounds on the first absorption tower and the first adsorption tower to complete the regeneration. Step 4: If the test result at the first oil and gas outlet of the second adsorption tower is still exceeding the standard, disconnect the passage between the booster device and the second absorption tower, switch the gas containing volatile organic compounds to the first processing line for absorption and adsorption treatment, and test the content of volatile organic compounds in the treated gas at the first oil and gas outlet of the first adsorption tower. At the same time, perform desorption treatment of volatile organic compounds on the second absorption tower and the second adsorption tower to complete the regeneration. Step 5: Repeat steps 3-4 until the test results at the first oil and gas outlet of the first adsorption tower or the second adsorption tower are qualified.

2. The method for processing oil and gas according to claim 1, characterized in that, The first and second absorption towers are filled with liquid hydrocarbon absorbents with a boiling point of 200-300 ℃ and a freezing point of -50~-10 ℃.

3. The method for processing oil and gas according to claim 1, characterized in that, The first adsorption tower and the second adsorption tower are filled with a regenerable adsorbent, which is one or more of carbon nanotubes, graphene, acid clay, alumina, molecular sieves, activated carbon, and activated carbon fibers.

4. The method for processing oil and gas according to claim 1, characterized in that, The absorption and adsorption treatment along the first processing line includes: the pressurized gas containing volatile organic compounds enters the first absorption tower through the oil and gas inlet; at -30 ℃ to 10 ℃ and 0.13 MPa to 1.5 MPa, a portion of the volatile organic compounds are absorbed by the liquid hydrocarbon absorbent in the first absorption tower; the remaining gas containing volatile organic compounds exits the first absorption tower and enters the first adsorption tower through the oil and gas inlet; at -30 ℃ to 10 ℃ and 0.12 MPa to 1.48 MPa, the adsorbent in the first adsorption tower adsorbs the remaining volatile organic compounds.

5. The method for processing oil and gas according to claim 1, characterized in that, The absorption and adsorption treatment along the second processing line includes: the pressurized gas containing volatile organic compounds enters the second absorption tower through the oil and gas inlet; at -30 ℃ to 10 ℃ and 0.13 MPa to 1.5 MPa, a portion of the volatile organic compounds are absorbed by the liquid hydrocarbon absorbent in the second absorption tower; the remaining gas containing volatile organic compounds exits the second absorption tower and enters the second adsorption tower through the oil and gas inlet; at -30 ℃ to 10 ℃ and 0.12 MPa to 1.48 MPa, the adsorbent in the second adsorption tower adsorbs the remaining volatile organic compounds.

6. The method for processing oil and gas according to claim 1, characterized in that, The desorption treatment of volatile organic compounds in the first absorption tower and the first adsorption tower includes: disconnecting the passage between the first absorption tower and the first adsorption tower, connecting the passage between the first absorption tower and the collection tank, heating the first absorption tower to 100°C and maintaining it for 30-60 min, so that the volatile organic compounds in the liquid hydrocarbon absorbent are desorbed and collected in the collection tank. A passage is connected between the first adsorption tower and the vacuum pump, and a small amount of nitrogen is introduced into the first adsorption tower through the nitrogen inlet. The volatile organic compounds adsorbed in the adsorbent are desorbed by evacuating the vacuum tower in stages and collected into the vacuum pump.

7. The method for processing oil and gas according to claim 1, characterized in that, The desorption treatment of volatile organic compounds in the second absorption tower and the second adsorption tower includes: disconnecting the passage between the second absorption tower and the second adsorption tower, connecting the passage between the second absorption tower and the collection tank, heating the second absorption tower to 100°C, maintaining it for 30-60 minutes to desorb the volatile organic compounds in the liquid hydrocarbon absorbent, and collecting them in the collection tank. Connect the passage between the second adsorption tower and the vacuum pump, and introduce a small amount of nitrogen into the second adsorption tower through the nitrogen inlet. Use a step-by-step vacuuming method to desorb the volatile organic compounds adsorbed in the adsorbent and collect them into the vacuum pump.

8. The method for processing oil and gas according to claim 6 or 7, characterized in that, The step-by-step vacuuming method includes: Pump at -20 kPa~-30 kPa for 5-10 minutes; Pump at -60 kPa ~-75 kPa for 5-10 minutes; Pump at -90 kPa ~-95 kPa for 5-10 minutes.

9. The method for processing oil and gas according to claim 1, characterized in that, The gas containing volatile organic compounds is composed of an inert gas and volatile organic compounds, wherein the molecular weight of the volatile organic compounds is 42-180 and the concentration is 0.01%-2%; the inert gas includes one or more of nitrogen, argon and CO2; The qualified test results include: the organic matter content in the gas containing volatile organic compounds is less than 50 ppm, and the content of compounds with C5 or higher is less than 4 ppm.

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