Methanol synthesis gas pretreatment system

Abstract

The utility model relates to a methanol synthesis gas pretreatment system and belongs to the technical field of methanol synthesis gas treatment. Comprising decarburization equipment, cryogenic separation equipment, a compressor, a gas-liquid separator, a desulfurization tank and a controller. Coke-oven gas is output through coking equipment, carbon dioxide gas and carbon monoxide gas are generated through decarburization equipment and cryogenic separation equipment, the carbon dioxide gas and the carbon monoxide gas are compressed through a compressor to obtain compressed gas, and the compressed gas enters a gas-liquid separator and then enters a gas-liquid separator. A wire mesh demister in the gas-liquid separator is used for carrying out first adsorption treatment on the compressed gas, and then a filter element in the gas-liquid separator is used for carrying out second adsorption treatment on the compressed gas, so that the dryness and cleanliness of the compressed gas entering the desulfurization tank are ensured; dry and clean compressed gas enters the desulfurization tank and is desulfurized with the desulfurizer, so that the activity of the desulfurizer can be ensured, the service life of the desulfurizer is prolonged, the desulfurizer does not need to be replaced frequently, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of methanol synthesis gas treatment, in particular to a methanol synthesis gas pretreatment system. Background Art

[0002] Methanol synthesis gas refers to the gas required for methanol synthesis. Currently, in the production process of methanol, part of the gas in methanol synthesis gas is obtained as follows: the coke oven gas produced by the coking equipment is processed by the decarbonization equipment and the cryogenic separation equipment to produce carbon dioxide gas and carbon monoxide gas. The carbon dioxide gas and carbon monoxide gas are compressed by the compressor and then input into the desulfurization tank. The desulfurizer in the desulfurization tank desulfurizes the compressed gas. The compressed gas that has completed the desulfurization treatment is part of the gas in methanol synthesis gas, which is subsequently input into the methanol synthesis equipment for the preparation of methanol.

[0003] However, in the existing system, compressed carbon dioxide gas and carbon monoxide gas easily carry water vapor. When entering the desulfurization tank to react with the desulfurizer, the water vapor easily causes the desulfurizer to lose its reaction activity, thereby affecting the subsequent methane production, and easily shortening the service life of the desulfurizer, resulting in increased production costs. Utility Model Content

[0004] In order to solve the above technical problems, the present invention provides a methanol synthesis gas pretreatment system. The technical solution of the present invention is as follows:

[0005] The utility model provides a methanol synthesis gas pretreatment system, comprising a decarbonization device, a cryogenic separation device, a compressor, a gas-liquid separator, a desulfurization tank and a controller, wherein the outlet of the coking device is connected to the inlet of the decarbonization device and the inlet of the cryogenic separation device respectively through connecting pipelines, the outlet of the decarbonization device and the outlet of the cryogenic separation device are both connected to the inlet of the compressor through connecting pipelines, the outlet of the compressor is connected to the inlet of the gas-liquid separator through a connecting pipeline, the outlet of the gas-liquid separator is connected to the inlet of the desulfurization tank through a connecting pipeline, and the outlet of the desulfurization tank is connected to the inlet of the methanol synthesis device through a connecting pipeline;

[0006] The gas-liquid separator includes a shell, a wire mesh demister, a filter element, a drain pipe, a drain solenoid valve and a liquid accumulation pool. The shell is provided with an inlet and an outlet. The outlet of the compressor is connected to the inlet of the shell through a connecting pipe, and the outlet of the shell is connected to the inlet of the desulfurization tank through a connecting pipe. The outer wall of the wire mesh demister is connected to the inner wall of the shell. The outer walls of the top and bottom ends of the filter element are both provided with fixing rings, and the outer walls of each of the fixing rings are circumferentially connected to multiple connecting rods. The filter element is fixed to the inside of the shell by two fixing rings and multiple connecting rods. The filter element is located below the wire mesh demister, one end of the drain pipe is connected to the bottom end of the shell, and the other end of the drain pipe is connected to the inlet of the liquid accumulation pool. The drain solenoid valve is connected to the drain pipe; the drain solenoid valve is electrically connected to the controller.

[0007] Optionally, a methanol synthesis gas pretreatment system also includes a spray head, a spray pipe, a water pump and a water tank, the inlet of the water pump is connected to the water tank, the outlet of the water pump is connected to one end of the spray pipe, the other end of the spray pipe is connected to the top of the spray head, the spray head is located inside the shell and above the wire mesh demister, the water tank and water pump are both located outside the shell; the water pump is electrically connected to the controller.

[0008] Optionally, the gas-liquid separator further includes: a liquid level sensor, which is fixed to the lower part of the inner wall of the shell and is electrically connected to the controller.

[0009] Optionally, a methanol synthesis gas pretreatment system further includes a first stop valve, which is connected to the connecting pipe between the outlet of the decarbonization equipment and the outlet of the cryogenic separation equipment and the inlet of the compressor, and the first stop valve is electrically connected to the controller.

[0010] Optionally, a methanol synthesis gas pretreatment system further includes a second stop valve, which is connected to a connecting pipe between the gas-liquid separator and the desulfurization tank, and the second stop valve is electrically connected to the controller.

[0011] All the above optional technical solutions can be combined arbitrarily, and the present utility model does not provide detailed descriptions of the structures after each combination.

[0012] By means of the above solution, the beneficial effects of the present invention are as follows:

[0013] By setting up decarbonization equipment, cryogenic separation equipment, compressor, gas-liquid separator, desulfurization tank and controller, the outlet of the coking equipment is connected to the inlet of the decarbonization equipment and the inlet of the cryogenic separation equipment respectively, the outlet of the decarbonization equipment and the outlet of the cryogenic separation equipment are both connected to the inlet of the compressor, the outlet of the compressor is connected to the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is connected to the inlet of the desulfurization tank; the coke oven gas output from the coking equipment passes through the decarbonization equipment and the cryogenic separation equipment to produce carbon dioxide gas and carbon monoxide gas, and the carbon dioxide gas and carbon monoxide gas are compressed by the compressor to obtain compressed gas, and after the compressed gas enters the gas-liquid separator, the wire mesh demister in the gas-liquid separator performs the first degassing on the compressed gas. The compressed gas is subjected to a second adsorption treatment to adsorb part of the impurities and water vapor in the compressed gas, and then the compressed gas is subjected to a second adsorption treatment through the filter element in the gas-liquid separator to further adsorb the remaining impurities and water vapor in the compressed gas, thereby ensuring the dryness and cleanliness of the compressed gas entering the desulfurization tank; the dry and clean compressed gas enters the desulfurization tank and is desulfurized with the desulfurizer, which can ensure the activity of the desulfurizer, thereby extending the service life of the desulfurizer, eliminating the need for frequent replacement of the desulfurizer, and reducing production costs; when the wire mesh demister and the filter element have been working for a certain period of time, the controller can control the drain solenoid valve in the gas-liquid separator to open, and the water in the shell will flow into the liquid accumulation pool through the drain pipe to avoid affecting the subsequent adsorption effect of the compressed gas.

[0014] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the system composition of the present utility model.

[0016] Description of Figure Numbers:

[0017] 1. Coking equipment; 2. Decarbonization equipment; 3. Cryogenic separation equipment; 4. Compressor; 5. Gas-liquid separator; 51. Shell; 52. Wire mesh demister; 53. Filter element; 54. Drain pipe; 55. Drain solenoid valve; 56. Liquid accumulation tank; 57. Fixed ring; 58. Connecting rod; 6. Desulfurization tank; 7. Methanol synthesis equipment; 8. Spray head; 9. Spray pipe; 10. Water pump; 11. Water tank; 12. Liquid level sensor; 13. First stop valve; 14. Second stop valve. DETAILED DESCRIPTION

[0018] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0019] like Figure 1 As shown, the present invention provides a methanol synthesis gas pretreatment system, including a decarbonization device 2, a cryogenic separation device 3, a compressor 4, a gas-liquid separator 5, a desulfurization tank 6 and a controller. The outlet of the coking device 1 is connected to the inlet of the decarbonization device 2 and the inlet of the cryogenic separation device 3 through connecting pipelines, respectively. The outlet of the decarbonization device 2 and the outlet of the cryogenic separation device 3 are both connected to the inlet of the compressor 4 through connecting pipelines. The outlet of the compressor 4 is connected to the inlet of the gas-liquid separator 5 through a connecting pipeline. The outlet of the gas-liquid separator 5 is connected to the inlet of the desulfurization tank 6 through a connecting pipeline. The outlet of the desulfurization tank 6 is connected to the inlet of the methanol synthesis device 7 through a connecting pipeline.

[0020] The gas-liquid separator 5 includes a shell 51, a wire mesh demister 52, a filter element 53, a drain pipe 54, a drain solenoid valve 55 and a liquid accumulation pool 56. The shell 51 is provided with an inlet and an outlet. The outlet of the compressor 4 is connected to the inlet of the shell 51 through a connecting pipe. The outlet of the shell 51 is connected to the inlet of the desulfurization tank 6 through a connecting pipe. The outer wall of the wire mesh demister 52 is connected to the inner wall of the shell 51. The outer walls of the top and bottom ends of the filter element 53 are both provided with fixing rings 57. The outer walls of each of the fixing rings 57 are circumferentially connected to a plurality of connecting rods 58. The filter element 53 is fixed to the inside of the shell 51 through two fixing rings 57 and a plurality of connecting rods 58. The filter element 53 is located below the wire mesh demister 52. One end of the drain pipe 54 is connected to the bottom end of the shell 51, and the other end of the drain pipe 54 is connected to the inlet of the liquid accumulation pool 56. The drain solenoid valve 55 is connected to the drain pipe 54; the drain solenoid valve 55 is electrically connected to the controller.

[0021] Specifically, the carbon dioxide gas in the present invention is produced by the decarbonization equipment 2, and the carbon monoxide gas is produced by the cryogenic separation equipment 3; the cryogenic separation equipment 3 forms carbon monoxide gas by filtering, compressing, cooling and other processes on the coke oven gas delivered by the coking equipment 1.

[0022] In a specific embodiment, the coke oven gas output from the coking equipment 1 passes through the decarbonization equipment 2 and the cryogenic separation equipment 3 to produce carbon dioxide gas and carbon monoxide gas, and the carbon dioxide gas and carbon monoxide gas are compressed by the compressor 4 to obtain compressed gas. After the compressed gas enters the gas-liquid separator 5, the wire mesh demister 52 in the gas-liquid separator 5 performs a first adsorption treatment on the compressed gas to adsorb a part of the impurities and water vapor in the compressed gas, and then the filter element 53 in the gas-liquid separator 5 performs a second adsorption treatment on the compressed gas to further adsorb the remaining impurities and water vapor in the compressed gas. The compressed gas after adsorption enters the desulfurization tank 6 to react with the desulfurizer, so that the sulfur is completely separated from the compressed gas. The compressed gas after desulfurization is used to prepare methanol in the methanol synthesis equipment 7.

[0023] By connecting a wire mesh demister 52 and a filter element 53 in the gas-liquid separator 5, the compressed gas is subjected to two adsorption treatments to ensure the dryness and cleanliness of the compressed gas entering the desulfurization tank 6; by allowing the dry and clean compressed gas to enter the desulfurization tank 6 to react with the desulfurizer, it can be ensured that the desulfurizer will not lose its activity when it comes into contact with water, thereby extending the service life of the desulfurizer, eliminating the need for frequent replacement of the desulfurizer, and reducing production costs; after the wire mesh demister 52 and the filter element 53 have been working for a certain period of time, the controller can control the drain solenoid valve 55 in the gas-liquid separator 5 to open, and the water in the shell 51 flows into the liquid accumulation pool 56 through the drain pipe to avoid affecting the subsequent adsorption effect of the compressed gas.

[0024] Optionally, a methanol synthesis gas pretreatment system also includes a spray head 8, a spray pipe 9, a water pump 10 and a water tank 11, the inlet of the water pump 10 is connected to the water tank 11, the outlet of the water pump 10 is connected to one end of the spray pipe 9, and the other end of the spray pipe 9 is connected to the top of the spray head 8, the spray head 8 is located inside the shell 51 and above the wire mesh demister 52, the water tank 11 and the water pump 10 are both located outside the shell 51; the water pump 10 is electrically connected to the controller.

[0025] As an embodiment, the controller can periodically control the water pump 10 to start, and the water pump 10 draws water from the water tank 11 and transports it to the spray head 8 through the spray pipe 9, and then sprays it out through the spray head 8 to achieve spray cleaning of the wire mesh demister 52 and the filter element 53.

[0026] As another embodiment, the staff can observe the desulfurization effect of the desulfurizer. If the desulfurization effect of the desulfurizer on the compressed gas is poor, it proves that the water vapor inside the compressed gas is not completely separated, thereby determining that the wire mesh demister 52 and the filter element 53 need to be cleaned. At this time, the controller can start the water pump 10, so that the water in the water tank 11 is sprayed to the wire mesh demister 52 and the filter element 53 through the spray head 8 for cleaning.

[0027] Optionally, the gas-liquid separator 5 further includes a liquid level sensor 12 , which is fixed to the lower portion of the inner wall of the shell 51 , and is electrically connected to the controller.

[0028] The liquid level sensor 12 detects the liquid level inside the gas-liquid separator 5 in real time and transmits the signal to the controller. The controller judges and analyzes the signal and then controls the drain solenoid valve 55 to open or close, thereby controlling whether the liquid in the gas-liquid separator 5 is discharged.

[0029] Optionally, a methanol synthesis gas pretreatment system further includes a first stop valve 13, which is connected to the connecting pipe between the outlet of the decarbonization equipment 2 and the outlet of the cryogenic separation equipment 3 and the inlet of the compressor 4, and the first stop valve 13 is electrically connected to the controller.

[0030] Optionally, a methanol synthesis gas pretreatment system further includes a second stop valve 14, wherein the second stop valve 14 is connected to the connecting pipe between the gas-liquid separator 5 and the desulfurization tank 6, and the second stop valve 14 is electrically connected to the controller.

[0031] According to different actual production conditions, the output flow rates of carbon dioxide gas and carbon monoxide gas and the output flow rate of the compressed gas after the adsorption treatment are controlled by the first stop valve 13 and the second stop valve 14 .

[0032] In summary, the methanol synthesis gas pretreatment system provided by the present invention can perform two adsorption treatments on the compressed gas by providing a gas-liquid separator 5 and providing a wire mesh demister 52 and a filter element 53 inside the gas-liquid separator 5 to ensure the effect of removing water vapor and impurities, thereby ensuring the activity of the desulfurizer when the compressed gas reacts with the desulfurizer. By providing a water tank 11, a water pump 10, a spray pipe 9 and a spray head 8, the wire mesh demister 52 and the filter element 53 can be sprayed and cleaned to avoid the wire mesh demister 52 and the filter element 53 being blocked due to long-term use; by providing a liquid level sensor 12, the liquid level inside the gas-liquid separator 5 can be detected in real time to avoid the liquid level inside the gas-liquid separator 5 being too high and affecting the adsorption effect on the compressed gas.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A methanol synthesis gas pretreatment system, characterized in that: include: A decarbonization device (2), a cryogenic separation device (3), a compressor (4), a gas-liquid separator (5), a desulfurization tank (6) and a controller; the outlet of the coking device (1) is connected to the inlet of the decarbonization device (2) and the inlet of the cryogenic separation device (3) respectively through connecting pipelines; the outlet of the decarbonization device (2) and the outlet of the cryogenic separation device (3) are both connected to the inlet of the compressor (4) through connecting pipelines; the outlet of the compressor (4) is connected to the inlet of the gas-liquid separator (5) through connecting pipelines; the outlet of the gas-liquid separator (5) is connected to the inlet of the desulfurization tank (6) through connecting pipelines; and the outlet of the desulfurization tank (6) is connected to the inlet of the methanol synthesis device (7) through connecting pipelines; The gas-liquid separator (5) comprises a shell (51), a wire mesh demister (52), a filter element (53), a drain pipe (54), a drain solenoid valve (55) and a liquid accumulation pool (56). The shell (51) is provided with an inlet and an outlet. The outlet of the compressor (4) is connected to the inlet of the shell (51) through a connecting pipe. The outlet of the shell (51) is connected to the inlet of the desulfurization tank (6) through a connecting pipe. The outer wall of the wire mesh demister (52) is connected to the inner wall of the shell (51). The outer walls of the top and bottom ends of the filter element (53) are both A fixing ring (57) is provided, and the outer wall of each fixing ring (57) is circumferentially connected to a plurality of connecting rods (58). The filter element (53) is fixed inside the housing (51) through two fixing rings (57) and a plurality of connecting rods (58). The filter element (53) is located below the wire mesh demister (52). One end of the drain pipe (54) is connected to the bottom end of the housing (51), and the other end of the drain pipe (54) is connected to the inlet of the liquid accumulation pool (56). The drain solenoid valve (55) is connected to the drain pipe (54); The liquid discharge solenoid valve (55) is electrically connected to the controller.

2. A methanol synthesis gas pretreatment system according to claim 1, characterized in that: Also includes: A spray head (8), a spray pipe (9), a water pump (10) and a water tank (11), wherein the inlet of the water pump (10) is connected to the water tank (11), the outlet of the water pump (10) is connected to one end of the spray pipe (9), and the other end of the spray pipe (9) is connected to the top of the spray head (8), the spray head (8) is located inside the shell (51) and above the wire mesh demister (52), and the water tank (11) and the water pump (10) are both located outside the shell (51); The water pump (10) is electrically connected to the controller.

3. A methanol synthesis gas pretreatment system according to claim 1 or 2, characterized in that: The gas-liquid separator (5) further comprises a liquid level sensor (12), wherein the liquid level sensor (12) is fixed to the lower portion of the inner wall of the housing (51), and the liquid level sensor (12) is electrically connected to the controller.

4. A methanol synthesis gas pretreatment system according to claim 1, characterized in that: Also includes: A first stop valve (13), the first stop valve (13) is connected to the connecting pipe between the outlet of the decarbonization equipment (2), the outlet of the cryogenic separation equipment (3) and the inlet of the compressor (4), and the first stop valve (13) is electrically connected to the controller.

5. The methanol synthesis gas pretreatment system according to claim 1, characterized in that: Also includes: A second stop valve (14), the second stop valve (14) is connected to the connecting pipe between the gas-liquid separator (5) and the desulfurization tank (6), and the second stop valve (14) is electrically connected to the controller.

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