Methanol tank field volatile organic compound treatment device

Abstract

The utility model relates to the technical field of volatile organic compound treatment, in particular to a volatile organic compound treatment device in a methanol tank field. A methanol tank area volatile organic compound treatment device comprises a refined methanol storage tank group, a secondary washing unit, a reciprocating compressor and a crude methanol storage tank group, the refined methanol storage tank group and the crude methanol storage tank group are respectively communicated with the secondary washing unit, and the crude methanol storage tank group is connected with a fuel gas pipe network through the reciprocating compressor. According to the utility model, organic matters volatilized in a methanol tank area can be treated through water washing and pressurization, heat values of methanol and low-grade tail gas are recycled by virtue of an existing rectification device, a fuel gas pipe network and the like, and the waste of methanol is reduced; and volatile organic compounds such as fusel, ketone and ethers can be utilized by pressurizing and introducing into a fuel gas pipe network, so that the problem that non-methane total hydrocarbon brought by tail gas secondary washing exceeds the standard is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of volatile organic matter treatment, in particular to a volatile organic matter treatment device for a methanol tank area. Background Art

[0002] In the chemical industry, methanol tank areas are used as storage and transportation areas for methanol, and the management of volatile organic compounds (VOCs) is a highly concerned environmental issue. In methanol tank areas, methanol is a highly volatile organic compound, and its storage process may lead to the volatilization of methanol, thereby generating a large amount of VOCs, which have adverse effects on the human body and the environment.

[0003] At present, in the existing technology, adsorption, absorption, condensation, etc. are often used to treat VOCs in methanol tank areas. However, after treating methanol, this method cannot effectively recycle methanol for secondary use; in addition, volatile organic compounds such as fusel alcohols, ketones, and ethers cannot be recycled or treated.

[0004] Therefore, it is necessary to design a volatile organic compound treatment device for a methanol tank area to solve the above technical problems. Utility Model Content

[0005] In response to the above problems, the present application provides a volatile organic matter treatment device for a methanol tank area, which can treat the volatile organic matter in the methanol tank area through water washing and pressurization, and rely on the existing distillation equipment and fuel gas pipeline network to recycle the calorific value of methanol and low-grade tail gas, thereby reducing the waste of methanol; and can utilize volatile organic matter such as alcohols, ketones, and ethers by pressurizing the fuel gas pipeline network, thereby reducing the problem of excessive non-methane total hydrocarbons from the secondary water washing zone of the tail gas.

[0006] To achieve the purpose of this application, this application provides the following technical solutions:

[0007] The present application provides a volatile organic matter treatment device for a methanol tank area, comprising: a refined methanol storage tank group, a secondary water washing unit, a compressor and a crude methanol storage tank group, wherein the refined methanol storage tank group and the crude methanol storage tank group are respectively connected to the secondary water washing unit;

[0008] Wherein, the secondary water washing unit includes: a primary water washing tower and a secondary water washing tower, the top of the primary water washing tower and the top of the secondary water washing tower are both connected with a circulating water supply device, the top of the primary water washing tower is connected with the secondary water washing tower through a first pipe, and the bottom of the secondary water washing tower is connected with the primary water washing tower through a second pipe, the bottom of the primary water washing tower is connected with a third pipe for internal circulation thereof, the bottom of the secondary water washing tower is connected with a fourth pipe for internal circulation thereof, and the bottom of the primary water washing tower is connected with a distillation pre-tower through a fifth pipe, the second pipe is connected with the third pipe, and the fourth pipe is connected with the fifth pipe.

[0009] In a possible implementation, the secondary water washing unit also includes: a gas-liquid separation tank and a tail gas vent cylinder. The gas-liquid separation tank is connected to the top of the secondary water washing tower, the bottom of the gas-liquid separation tank is connected to the secondary water washing tower, and the top of the gas-liquid separation tank is connected to the tail gas vent cylinder.

[0010] In a possible implementation, the tops of the refined methanol storage tank groups are connected to the refined methanol tail gas collecting main pipe, and a flow meter, an induced draft fan A and an induced draft fan B located on the refined methanol tail gas collecting main pipe are also provided between the refined methanol tail gas collecting main pipe and the primary water washing tower.

[0011] In a possible implementation, a circulation A pump, a circulation A pump outlet valve, and a regulating valve for the washing liquid of the secondary water washing tower to enter the primary water washing tower are sequentially arranged on the second pipeline from right to left.

[0012] In a possible implementation, the third pipeline with the bottom of the primary water washing tower as the starting end is sequentially provided with a wastewater delivery B pump, a wastewater delivery B pump outlet valve and a primary water washing tower water circulation manual valve.

[0013] In a possible implementation, a circulation B pump, a circulation B pump outlet valve and a secondary water washing tower water circulation manual valve are sequentially arranged on the fourth pipeline with the bottom of the secondary water washing tower as the starting end.

[0014] In a possible implementation, a wastewater delivery A pump, a wastewater delivery A pump outlet valve and a wastewater delivery regulating valve are sequentially arranged on the fifth pipeline with the bottom of the secondary water washing tower as the starting end.

[0015] In a possible implementation, the second pipe located between the outlet valve of the circulation A pump and the regulating valve for the washing liquid of the secondary water washing tower to enter the primary water washing tower is connected to the third pipe located between the outlet valve of the circulation B pump and the water circulation manual valve of the secondary water washing tower.

[0016] In a possible implementation, the fourth pipeline located between the outlet valve of the wastewater delivery pump B and the water circulation manual valve of the first-level water washing tower is connected to the fifth pipeline located between the outlet valve of the wastewater delivery pump A and the wastewater export regulating valve.

[0017] In one possible implementation, the top of the crude methanol storage tank group is connected to the crude methanol exhaust gas collecting main pipe, and the crude methanol exhaust gas collecting main pipe is provided with a crude methanol exhaust gas out-of-bounds cut-off valve and an oxygen content detector. The crude methanol exhaust gas collecting main pipe located on the right side of the oxygen content detector is divided into three branches that are respectively connected to the flow meter, the exhaust gas discharge valve with excessive oxygen content, and the reciprocating compressor.

[0018] The beneficial effects of the utility model are:

[0019] 1. The utility model can wash the tail gas containing volatile organic matter by circulation between the primary water washing tower and the secondary water washing tower and self-circulation of the primary water washing tower and the secondary water washing tower, thereby simplifying the treatment process, making the volatilized methanol fully dissolved in the desalted water, and then relying on the existing distillation device to recycle the methanol, thereby reducing the waste of methanol.

[0020] 2. The utility model can process the volatilized mixed gas in the crude methanol tank group through multiple paths. Under normal working conditions (the reciprocating compressor is normal and the oxygen content does not exceed the standard), volatile organic substances such as carbon monoxide, hydrogen, fusel alcohols, ketones, ethers, etc. can be pressurized and sent to the fuel gas pipeline network to utilize carbon monoxide, fusel alcohols, ketones, ethers, etc., thereby reducing the problem of excessive non-methane total hydrocarbons from the secondary water washing zone of the exhaust gas; when the reciprocating compressor fails (the oxygen content does not exceed the standard), the exhaust gas can also be treated and discharged; when the oxygen content exceeds the standard, it is directly discharged into the air, which can effectively prevent flash explosion damage to the reciprocating compressor and the fuel gas pipeline network.

[0021] 3. The two circulation pumps and two wastewater circulation pumps provided in the utility model can effectively prevent the other circulation pump or the other wastewater circulation pump from being able to work normally when one of the circulation pumps or one of the wastewater circulation pumps fails to work normally, thereby ensuring the circulation between the primary water washing tower and the secondary water washing tower, the self-circulation of the primary water washing tower, and the self-circulation of the secondary water washing tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0023] Figure 1 It is a schematic diagram of the overall governance structure of the utility model;

[0024] Figure symbols: 1, T3701A finished methanol tank; 2, T3701B finished methanol tank; 3, T3602A refined methanol tank; 4, T3602B refined methanol tank; 5, T36B01A methanol intermediate tank; 6, T36B01B methanol intermediate tank; 7, T37B01 methanol finished tank; 8, primary water scrubber; 9, secondary water scrubber; 10, gas-liquid separation tank; 11, tail gas vent cylinder; 12, circulation pump A; 13, circulation pump B; 14, wastewater delivery pump A ; 15. Wastewater delivery pump B; 16. Wastewater delivery pump A outlet valve; 17. Wastewater delivery pump B outlet valve; 18. Primary water washing tower water circulation manual valve; 19. Circulation pump B outlet valve; 20. Circulation pump A outlet valve; 21. Secondary water washing tower water circulation manual valve; 22. Secondary water washing tower washing liquid into primary water washing tower regulating valve; 23. Circulation water replenishment regulating valve; 24. Flow meter; 25. Wastewater delivery regulating valve; 26. 1# tank area refined methanol tail gas boundary area cut-off valve; 27. 2# tank area Refined methanol tail gas boundary cut-off valve; 28, T3602A / B tail gas cut-off valve; 29, T3701B tail gas cut-off valve; 30, T3701A tail gas cut-off valve; 31, T36B01A / B, T37B01 tail gas cut-off valve; 32, flame arrester; 33, A induced draft fan; 34, B induced draft fan; 35, T3603 sulfur-containing methanol tank; 36, T3603 sulfur-containing methanol tank tail gas cut-off valve; 37, T3604 fusel oil tank; 38, T3604 fusel alcohol Oil tank tail gas shut-off valve; 39. T3602A crude methanol storage tank; 40. T3602B crude methanol storage tank; 41. T3602A / B crude methanol storage tank tail gas shut-off valve; 42. Crude methanol tail gas out-of-bounds area shut-off valve; 43. Oxygen content detector; 44. Oxygen content excessive tail gas discharge valve; 45. Crude methanol tail gas inlet water washing unit connecting valve; 46. Compressor inlet shut-off valve; 47. Reciprocating compressor; 48. Refined methanol tail gas collection main pipe; 49. Crude methanol tail gas collection main pipe. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0027] Example 1

[0028] Figure 1 A volatile organic compound treatment device for a methanol tank area provided in an embodiment of the present application comprises: a refined methanol storage tank group, a secondary water washing unit and a crude methanol storage tank group, wherein the refined methanol storage tank group and the crude methanol storage tank group are respectively connected to the secondary water washing unit;

[0029] Wherein, the secondary water washing unit includes: a primary water washing tower 8 and a secondary water washing tower 9, the top of the primary water washing tower 8 and the top of the secondary water washing tower 9 are both connected with a circulating water supply device, the top of the primary water washing tower 8 is connected with the secondary water washing tower 9 through a first pipe, and the bottom of the secondary water washing tower 9 is connected with the primary water washing tower 8 through a second pipe, the bottom of the primary water washing tower 8 is connected with a third pipe for internal circulation thereof, the bottom of the secondary water washing tower 9 is connected with a fourth pipe for internal circulation thereof, and the bottom of the primary water washing tower 8 is connected with a distillation pre-tower through a fifth pipe, the second pipe is connected with the third pipe, and the fourth pipe is connected with the fifth pipe.

[0030] It should be noted that the refined methanol storage tank group generally stores methanol with higher purity, and the volatile gases it produces are nitrogen and methanol; while the volatile gases in the crude methanol storage tank group are generally carbon monoxide, hydrogen, fusel alcohols, ketones, ethers and other volatile organic compounds.

[0031] Based on the above scheme, the alcohol-containing liquid in the primary water washing tower 8 first enters the secondary water washing tower 9 through the first pipe, and the alcohol-containing liquid in the secondary water washing tower 9 can enter the primary water washing tower 8 through the second pipe, so as to realize the circulation of the alcohol-containing liquid between the primary water washing tower 8 and the secondary water washing tower 9; the primary water washing tower 8 can realize the self-circulation of the alcohol-containing liquid in the primary water washing tower 8 through the third pipe; the secondary water washing tower 9 can realize the self-circulation of the alcohol-containing liquid in the secondary water washing tower 9 through the fourth pipe, so as to achieve the purpose of multiple water washing, and at the same time, the alcohol-containing liquid after water washing can enter the distillation pre-tower along the fifth pipe to recycle the low-grade calorific value and methanol.

[0032] Optionally, a circulating water replenishment regulating valve 23 is provided at the pipeline connecting the circulating water supply device and the primary water washing tower 8 and the secondary water washing tower 9, and the circulating water supply device can replenish desalted water to the primary water washing tower 8 and the secondary water washing tower 9.

[0033] In one possible implementation, the secondary water washing unit also includes: a gas-liquid separation tank 10 and a tail gas vent cylinder 11. The gas-liquid separation tank 10 is connected to the top of the secondary water washing tower 9, the bottom of the gas-liquid separation tank 10 is connected to the secondary water washing tower 9, and the top of the gas-liquid separation tank 10 is connected to the tail gas vent cylinder 11.

[0034] In one possible implementation, the tops of the refined methanol storage tank groups are connected to the refined methanol tail gas collecting main pipe 48, and a flow meter 24, an A induced draft fan 33 and a B induced draft fan 34 located on the refined methanol tail gas collecting main pipe 48 are also provided between the refined methanol tail gas collecting main pipe 48 and the primary water washing tower 8.

[0035] Optionally, the refined methanol storage tank group includes: T3701A finished methanol tank 1, T3701B finished methanol tank 2, T3602A refined methanol tank 3 and T3602B refined methanol tank 4, wherein the T3701A finished methanol tank 1 is connected to the refined methanol tail gas collection main pipe 48 through the flame arrester 32 and the T3701A tail gas shut-off valve 30, and the T3701B finished methanol tank 2 is connected to the refined methanol tail gas collection main pipe 48 through the flame arrester 32 and the T3701B tail gas shut-off valve 29. 48 is connected, the T3602A refined methanol tank 3 and the T3602B refined methanol tank 4 are both connected to the refined methanol tail gas collecting main pipe 48 through the flame arrester 32 and the T3602A / B tail gas shut-off valve 28, and the refined methanol tail gas collecting main pipe 48 connected to the T3701A finished methanol tank 1, the T3701B finished methanol tank 2, the T3602A refined methanol tank 3 and the T3602B refined methanol tank 4 is provided with a 1# tank area refined methanol tail gas boundary area shut-off valve 26.

[0036] Optionally, the refined methanol storage tank group also includes: T36B01A methanol intermediate tank 5, T36B01B methanol intermediate tank 6 and T37B01 methanol finished product tank 7, wherein the T36B01A methanol intermediate tank 5, the T36B01B methanol intermediate tank 6 and the T37B01 methanol finished product tank 7 are respectively connected to the refined methanol tail gas collecting main pipe 48 through the flame arrester 32, and the refined methanol tail gas collecting main pipe 48 connected to the T36B01A methanol intermediate tank 5, the T36B01B methanol intermediate tank 6 and the T37B01 methanol finished product tank 7 are sequentially provided with T36B01A / B, T37B01 tail gas shut-off valve 31, and 2# tank area refined methanol tail gas boundary area shut-off valve 27.

[0037] Optionally, the refined methanol tail gas collecting main pipe 48 provided with the refined methanol tail gas boundary area cut-off valve 26 of the 1# tank area and the refined methanol tail gas boundary area cut-off valve 27 of the 2# tank area are both connected to the flow meter 24.

[0038] In a possible implementation, the second pipeline is provided with a circulation A pump 12, a circulation A pump outlet valve 20 and a regulating valve 22 for the washing liquid of the secondary washing tower to enter the primary washing tower from right to left.

[0039] In a possible implementation, the third pipeline with the bottom of the primary water washing tower 8 as the starting end is sequentially provided with a wastewater delivery B pump 15, a wastewater delivery B pump outlet valve 17 and a primary water washing tower water circulation manual valve 18.

[0040] In a possible implementation, the fourth pipeline at the bottom of the secondary water washing tower 9 as the starting end is sequentially provided with a circulation B pump 13, a circulation B pump outlet valve 19 and a secondary water washing tower water circulation manual valve 21.

[0041] Based on the above scheme, during normal operation, the alcohol-containing liquid can circulate between the primary water washing tower 8 and the secondary water washing tower 9 and self-circulate in the secondary water washing tower 9. At this time, it is necessary to open the circulation A pump 12, the circulation A pump outlet valve 20 and the secondary water washing tower washing liquid into the primary water washing tower regulating valve 22, the circulation B pump 13, the circulation B pump outlet valve 19 and the secondary water washing tower water circulation manual valve 21.

[0042] In a possible implementation, the fifth pipeline at the bottom of the secondary water washing tower 9 as the starting end is sequentially provided with a wastewater delivery A pump 14, a wastewater delivery A pump outlet valve 16 and a wastewater delivery regulating valve 25.

[0043] Based on the above scheme, during normal operation, the alcohol-containing liquid can self-circulate in the primary water washing tower 8. At this time, the wastewater delivery regulating valve 25 can be closed, and the wastewater delivery B pump 15, the wastewater delivery B pump outlet valve 17 and the primary water washing tower water circulation manual valve 18 can be opened, so that the alcohol-containing liquid can be washed between the primary water washing tower 8 and the secondary water washing tower 9, in the primary water washing tower 8, and in the secondary water washing tower 9. After completion, the wastewater delivery A pump 14, the wastewater delivery A pump outlet valve 16 and the wastewater delivery regulating valve 25 are opened to pump the alcohol-containing liquid in the primary water washing tower 8 into the distillation pre-tower.

[0044] In one possible implementation, the second pipe located between the circulation A pump outlet valve 20 and the secondary water washing tower washing liquid entering the primary water washing tower regulating valve 22 is connected to the third pipe located between the circulation B pump outlet valve 19 and the secondary water washing tower water circulation manual valve 21.

[0045] Based on the above scheme, the second pipeline and the third pipeline are connected to prevent the circulation pump A 12 or the circulation pump B 13 from malfunctioning, and one of the pump bodies of the circulation pump A 12 or the circulation pump B 13 can work normally, so that the alcohol-containing liquid circulates between the primary water washing tower 8 and the secondary water washing tower 9, and the self-circulation in the secondary water washing tower 9 is guaranteed. Taking the normal operation of the circulation pump A 12 as an example, the circulation pump A outlet valve 20 is opened, and when only the alcohol-containing liquid needs to circulate between the primary water washing tower 8 and the secondary water washing tower 9, the secondary water washing tower 9 is closed. The water circulation manual valve 21 of the tower is opened, and the washing liquid of the secondary water washing tower enters the regulating valve 22 of the primary water washing tower; when only the alcohol-containing liquid needs to self-circulate in the secondary water washing tower 9, the water circulation manual valve 21 of the secondary water washing tower is opened, and the washing liquid of the secondary water washing tower enters the regulating valve 22 of the primary water washing tower is closed; when the alcohol-containing liquid needs to self-circulate in the secondary water washing tower 9 and the alcohol-containing liquid needs to circulate between the primary water washing tower 8 and the secondary water washing tower 9 simultaneously, the water circulation manual valve 21 of the secondary water washing tower and the regulating valve 22 of the washing liquid of the secondary water washing tower entering the primary water washing tower are opened.

[0046] In one possible implementation, the fourth pipeline located between the wastewater delivery B pump outlet valve 17 and the first-level water washing tower water circulation manual valve 18 is connected to the fifth pipeline located between the wastewater delivery A pump outlet valve 16 and the wastewater export regulating valve 25.

[0047] Based on the above scheme, the fourth pipeline is connected with the fifth pipeline. When the wastewater conveying pump A 14 and the wastewater conveying pump B 15 fail, one of the pump bodies of the wastewater conveying pump A 14 or the wastewater conveying pump B 15 can work normally. Taking the normal operation of the wastewater conveying pump A 14 as an example, the outlet valve 16 of the wastewater conveying pump A is opened. When only the alcohol-containing liquid needs to be self-circulated in the primary water washing tower 8, the water circulation manual valve 18 of the primary water washing tower is opened, and the wastewater delivery regulating valve 25 is closed, so that the alcohol-containing liquid can be self-circulated in the primary water washing tower 8; when only the alcohol-containing liquid in the primary water washing tower 8 needs to be sent to the distillation pre-tower, the water circulation manual valve 18 of the primary water washing tower is closed, and the wastewater delivery regulating valve 25 is opened; when the alcohol-containing liquid needs to be self-circulated in the primary water washing tower 8 and the alcohol-containing liquid in the primary water washing tower 8 needs to be sent to the distillation pre-tower at the same time, the water circulation manual valve 18 of the primary water washing tower and the wastewater delivery regulating valve 25 need to be opened.

[0048] In one possible implementation, the top of the crude methanol storage tank group is connected to a crude methanol tail gas collecting main pipe 49, on which a crude methanol tail gas out-of-bounds area cut-off valve 42 and an oxygen content detector 43 are provided. The crude methanol tail gas collecting main pipe 49 located on the right side of the oxygen content detector 43 is divided into three branches which are respectively connected to the flow meter 24, the oxygen content excessive tail gas discharge valve 44, and the reciprocating compressor 47.

[0049] Optionally, a crude methanol tail gas water washing unit connecting valve 45 is provided on the connecting pipe between the crude methanol tail gas collecting main pipe 49 and the refined methanol tail gas collecting main pipe 48 .

[0050] Optionally, a compressor inlet shut-off valve 46 is provided on the connecting pipeline between the crude methanol tail gas collecting main pipe 49 and the reciprocating compressor 47 .

[0051] Optionally, the reciprocating compressor 47 is also connected to the distillation pre-tower, and the reciprocating compressor 47 is connected to the fuel gas pipeline network.

[0052] Based on the above scheme, the volatile gas generated in the refined methanol tank group is directly introduced into the secondary water washing unit and then into the gas-liquid separation tank 10. The gas after water washing can be discharged through the tail gas vent tube 11, and the alcohol-containing liquid is sent to the reflux tank of the distillation pre-tower after water washing, thereby recycling methanol and reducing methanol waste.

[0053] In addition, based on the above scheme, the volatile gas generated in the crude methanol tank group is treated in the following ways:

[0054] Under normal circumstances, that is, the reciprocating compressor 47 works normally, the oxygen content monitor 43 detects that the oxygen content does not exceed the standard, and the compressor inlet cut-off valve 46 is opened to compress the volatilized gas from the crude methanol storage tank group into the fuel gas pipeline network through the reciprocating compressor 47, thereby fully utilizing the volatilized carbon monoxide, hydrogen, fusel alcohols, ketones, and ethers;

[0055] When the reciprocating compressor 47 fails and the oxygen content monitor 43 detects that the oxygen content is not exceeded, the compressor inlet shut-off valve 46 is closed, and the crude methanol tail gas water washing unit connecting valve 45 is opened, and the volatilized gas of the crude methanol storage tank group is passed into the secondary water washing unit for water washing, and the gas passed into the gas-liquid separation tank 10 after water washing is sent to the tail gas vent cylinder 11, and the alcohol-containing liquid is sent to the reflux tank of the distillation pre-tower, so as to recycle the methanol and reduce the waste of methanol;

[0056] When the oxygen content monitor 43 detects that the oxygen content exceeds the standard, no matter the reciprocating compressor 47 fails or operates normally, the compressor inlet shut-off valve 46 must be closed and the oxygen content excess exhaust valve 44 must be opened to prevent the volatilized mixed gas from entering the reciprocating compressor 47 and the fuel gas pipeline network when the oxygen content exceeds the standard, causing flash explosion damage to the compressor 47 and the fuel gas pipeline network.

[0057] Optionally, the crude methanol storage tank group includes: a T3603 sulfur-containing methanol tank 35, a T3604 fusel oil tank 37, a T3602A crude methanol storage tank 39 and a T3602B crude methanol storage tank 40, wherein the T3603 sulfur-containing methanol tank 35 is connected to the crude methanol tail gas collection main pipe 49 through the flame arrester 32 and the T3603 sulfur-containing methanol tank tail gas cut-off valve 36, and the T3604 fusel oil tank 37 is connected to the crude methanol tail gas collection main pipe 49 through the flame arrester 32 and the T3603 sulfur-containing methanol tank tail gas cut-off valve 36. The 3604 fusel oil tank tail gas shut-off valve 38 is connected to the crude methanol tail gas collecting main pipe 49, and the T3602A crude methanol storage tank 39 and the T3602B crude methanol storage tank 40 are both connected to the crude methanol tail gas collecting main pipe 49 through the flame arrester 32 and the T3602A / B crude methanol storage tank tail gas shut-off valve 41, and a crude methanol tail gas out-of-bounds area shut-off valve 42 is provided on the crude methanol tail gas collecting main pipe 49 near the oxygen content detector 43.

[0058] Working principle:

[0059] The volatilized gas in the refined methanol tank group is directly introduced into the secondary water washing unit through the refined methanol tail gas collection main pipe 48. After the gas and liquid are separated in the gas-liquid separation tank 10, the gas is discharged through the tail gas discharge tube 11, and the alcohol-containing liquid is sent to the reflux tank of the distillation pre-tower through the wastewater delivery pump A 14 or the wastewater delivery pump B 15 to recover the methanol.

[0060] The volatilized gas from the crude methanol tank group is processed in the following manner: Under normal circumstances, that is, the reciprocating compressor 47 operates normally and the oxygen content of the volatilized gas from the crude methanol storage tank group does not exceed the standard, the volatilized gas from the crude methanol storage tank group only needs to be supplied to the fuel gas pipeline network through the reciprocating compressor 47 for use, and the methanol compressed and separated by the reciprocating compressor 47 is sent to the distillation pre-tower; when the reciprocating compressor 47 fails and the oxygen content of the volatilized gas from the crude methanol storage tank group does not exceed the standard, the volatilized gas from the crude methanol storage tank group is only passed into the secondary water washing unit for water washing, and the gas generated in the gas-liquid separation tank 10 is sent to the tail gas vent cylinder 11, and the tail gas is processed in the tail gas vent cylinder 11, and the alcohol-containing liquid is sent to the reflux tank of the distillation pre-tower for recycling; when the oxygen content of the volatilized gas from the crude methanol storage tank group exceeds the standard, the tail gas discharge valve 44 with excessive oxygen content is opened to discharge it directly into the air.

[0061] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A volatile organic compound treatment device for a methanol tank area, characterized in that: include: A refined methanol storage tank group, a secondary water washing unit, a compressor and a crude methanol storage tank group, wherein the refined methanol storage tank group and the crude methanol storage tank group are respectively connected to the secondary water washing unit; The secondary water washing unit comprises: a primary water washing tower (8) and a secondary water washing tower (9), the top of the primary water washing tower (8) and the top of the secondary water washing tower (9) are both connected to a circulating water supply device, the top of the primary water washing tower (8) is connected to the secondary water washing tower (9) through a first pipeline, and the bottom of the secondary water washing tower (9) is connected to the primary water washing tower (8) through a second pipeline, the bottom of the primary water washing tower (8) is connected to a third pipeline for internal circulation, the bottom of the secondary water washing tower (9) is connected to a fourth pipeline for internal circulation, and the bottom of the primary water washing tower (8) is connected to a distillation pre-tower through a fifth pipeline, the second pipeline is connected to the third pipeline, and the fourth pipeline is connected to the fifth pipeline.

2. The volatile organic compound treatment device for a methanol tank area according to claim 1 is characterized in that: The secondary water washing unit further comprises: a gas-liquid separation tank (10) and an exhaust gas vent cylinder (11); the gas-liquid separation tank (10) is connected to the top of the secondary water washing tower (9); the bottom of the gas-liquid separation tank (10) is connected to the secondary water washing tower (9); and the top of the gas-liquid separation tank (10) is connected to the exhaust gas vent cylinder (11).

3. The volatile organic compound treatment device for a methanol tank area according to claim 1 is characterized in that: The tops of the refined methanol storage tank groups are all connected to the refined methanol tail gas collecting main pipe (48), and a flow meter (24), an induced draft fan A (33) and an induced draft fan B (34) located on the refined methanol tail gas collecting main pipe (48) and the primary water washing tower (8) are also provided.

4. The volatile organic compound treatment device for a methanol tank area according to claim 1 is characterized in that: The second pipeline is provided with a circulation A pump (12), a circulation A pump outlet valve (20) and a regulating valve (22) for the washing liquid of the secondary washing tower to enter the primary washing tower in sequence from right to left; The fourth pipeline at the bottom of the secondary water washing tower (9) as the starting end is provided with a circulation B pump (13), a circulation B pump outlet valve (19) and a secondary water washing tower water circulation manual valve (21) in sequence.

5. The volatile organic compound treatment device for a methanol tank area according to claim 1 is characterized in that: The third pipeline at the bottom of the primary water washing tower (8) as the starting end is provided with a wastewater delivery B pump (15), a wastewater delivery B pump outlet valve (17) and a primary water washing tower water circulation manual valve (18) in sequence; The fifth pipeline at the bottom of the secondary water washing tower (9) as the starting end is provided with a wastewater delivery A pump (14), a wastewater delivery A pump outlet valve (16) and a wastewater delivery regulating valve (25) in sequence.

6. The volatile organic compound treatment device for a methanol tank area according to claim 4 is characterized in that: The second pipeline located between the outlet valve (20) of the circulation A pump and the regulating valve (22) for the washing liquid of the secondary water washing tower to enter the primary water washing tower is connected to the third pipeline located between the outlet valve (19) of the circulation B pump and the water circulation manual valve (21) of the secondary water washing tower.

7. The volatile organic compound treatment device for a methanol tank area according to claim 5 is characterized in that: The fourth pipeline located between the outlet valve (17) of the wastewater delivery B pump and the water circulation manual valve (18) of the primary water washing tower is connected to the fifth pipeline located between the outlet valve (16) of the wastewater delivery A pump and the wastewater delivery regulating valve (25).

8. The volatile organic compound treatment device for a methanol tank area according to claim 3 is characterized in that: The top of the crude methanol storage tank group is connected to a crude methanol tail gas collecting main pipe (49), and a crude methanol tail gas out-of-bounds area cut-off valve (42) and an oxygen content detector (43) are provided on the crude methanol tail gas collecting main pipe (49). The crude methanol tail gas collecting main pipe (49) located on the right side of the oxygen content detector (43) is divided into three branches, which are respectively connected to the flow meter (24), the oxygen content excessive tail gas discharge valve (44), and the reciprocating compressor (47).

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