A water coal gas purification tail gas activated carbon adsorption treatment system

Abstract

The utility model relates to waste gas treatment equipment technical field discloses a kind of water coal gas purification tail gas activated carbon adsorption treatment systems, including tail gas water scrubber, and the exhaust port of tail gas water scrubber is equipped with tail gas pipe, still including adsorption treatment system, and the exhaust port of tail gas water scrubber is also connected with adsorption treatment system by air inlet pipe, and adsorption treatment system includes first adsorption tank and second adsorption tank, and first adsorption tank and second adsorption tank are connected in parallel, and the air outlet of adsorption treatment system is connected with tail gas pipe by exhaust pipe. The utility model can further treat tail gas, and operating cost can be reduced, and tail gas treatment effect is effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas treatment equipment, and in particular to an activated carbon adsorption treatment system for water gas purification tail gas. Background Technology

[0002] In the DMTE process for ethanol production, water gas undergoes low-temperature methanol washing for desulfurization and decarbonization, producing syngas rich in H2 and CO, which is then used for ethanol synthesis. The emitted tail gas contains residual methanol, trace amounts of sulfides, and inert components. Currently, plants typically use water washing towers to treat the tail gas before venting it at a high point.

[0003] The existing technology has at least the following problems: First, the efficiency of the water washing tower is insufficient. After the exhaust gas passes through the water washing tower, the methanol residue is still as high as 500-800 ppm, which cannot meet the national standard emission limit of VOCs≤60ppm. Second, the operating cost of repeated water washing is high, resulting in a waste of resources. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by developing an activated carbon adsorption treatment system for water gas purification tail gas. This invention can further treat tail gas, reduce operating costs, and effectively improve tail gas treatment efficiency.

[0005] The technical solution of this utility model to solve the technical problem is as follows: a water gas purification tail gas activated carbon adsorption treatment system, including a tail gas water washing tower, the exhaust port of the tail gas water washing tower is provided with a tail gas pipe, and also includes an adsorption treatment system. The exhaust port of the tail gas water washing tower is also connected to the adsorption treatment system through an inlet pipe. The adsorption treatment system includes a first adsorption tank and a second adsorption tank, the first adsorption tank and the second adsorption tank are arranged in parallel, and the exhaust port of the adsorption treatment system is connected to the tail gas pipe through an exhaust pipe.

[0006] As an optimization, the first adsorption tank is equipped with several layers of trays, with adsorbent placed between the trays. The second adsorption tank is exactly the same as the first. By setting up trays, the adsorbent in different layers can be separated, making it convenient for staff to clean and replace them.

[0007] As an optimization, the intake pipe is connected to the intake ports of the first and second adsorption tanks via two sets of intake branch pipes, respectively. The exhaust ports of the first and second adsorption tanks are connected to the first end of the exhaust pipe via two sets of exhaust branch pipes, and the second end of the exhaust pipe is connected to the tailpipe. By setting up the intake and exhaust branch pipes, the first and second adsorption tanks can be connected in parallel, achieving one in use and one on standby.

[0008] As an optimization, an inlet master valve is installed on the intake pipe, and an outlet master valve is installed on the exhaust pipe. By setting the inlet and outlet master valves, it is easy to switch the adsorption treatment system to adsorb hydrogen sulfide, methane, and methanol in the exhaust gas, ultimately ensuring that the non-methane total hydrocarbon content in the exhaust gas meets the requirements.

[0009] As an optimization, both sets of intake manifolds are equipped with inlet valves, and both sets of exhaust manifolds are equipped with outlet valves. By setting the inlet and outlet valves, the first and second adsorption tanks can be switched, and the standby adsorption tank can be switched when the adsorption effect decreases, so as to achieve uninterrupted continuous adsorption. At the same time, the internal packing of the old adsorption tank can be replaced.

[0010] As an optimization, a main exhaust gas outlet valve is installed on the exhaust gas pipe between the exhaust gas scrubbing tower and the exhaust pipe. By setting the main exhaust gas outlet valve, it can be opened to release excess exhaust gas when the pressure is too high, and can be closed after the pressure returns to normal, switching to the adsorption treatment system for further treatment of the exhaust gas.

[0011] As an optimization, an online pressure drop monitoring module is installed at the end of the exhaust pipe. By setting up an online pressure drop monitoring module, the exhaust gas can be monitored online, and an early warning can be issued when the adsorption effect decreases, allowing for the switching to of a backup adsorption tank.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] By installing a tail gas scrubbing tower, the tail gas can be scrubbed with water. By installing a tail gas pipe, excess gas can be released promptly when the system pressure is too high, thus maintaining internal pressure balance and allowing for high-point venting to prevent equipment and pipeline damage and potential safety accidents. By installing an inlet pipe, adsorption treatment system, and exhaust pipe, the tail gas can be further treated, adsorbing hydrogen sulfide, methane, and methanol, ultimately ensuring that the non-methane total hydrocarbon content in the tail gas meets requirements and that the tail gas is discharged in compliance with standards. This achieves deep removal of methanol and other VOCs from the tail gas from the low-temperature methanol scrubbing process. By installing a first and second adsorption tank in parallel, one can be in use while the other is on standby. When the adsorption effect decreases, the standby adsorption tank can be switched to achieve uninterrupted continuous adsorption, and the internal packing of the old adsorption tank can be replaced. This invention not only further treats the tail gas but also reduces operating costs and effectively improves the tail gas treatment effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the first adsorption tank in one embodiment of the present invention.

[0016] In the diagram: 1. Tail gas scrubbing tower; 2. Tail gas pipe; 3. Inlet pipe; 4. First adsorption tank; 5. Second adsorption tank; 6. Exhaust pipe; 7. Tower plate; 8. Inlet branch pipe; 9. Exhaust branch pipe; 10. Inlet main valve; 11. Outlet main valve; 12. Inlet valve; 13. Outlet valve; 14. Tail gas outlet main valve; 15. Online pressure drop monitoring module. Detailed Implementation

[0017] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0018] Example 1

[0019] Figure 1 and Figure 2 As one embodiment of this utility model, such as Figure 1 and Figure 2 As shown, a water gas purification tail gas activated carbon adsorption treatment system includes a tail gas water washing tower 1, the exhaust port of the tail gas water washing tower 1 is provided with a tail gas pipe 2, and also includes an adsorption treatment system. The exhaust port of the tail gas water washing tower 1 is also connected to the adsorption treatment system through an inlet pipe 3. The adsorption treatment system includes a first adsorption tank 4 and a second adsorption tank 5, which are arranged in parallel. The exhaust port of the adsorption treatment system is connected to the tail gas pipe 2 through an exhaust pipe 6.

[0020] By setting up a tail gas washing tower 1, the tail gas can be washed and treated with water. By setting up a tail gas pipe 2, excess gas can be released in time when the system pressure is too high, thereby maintaining the internal pressure balance of the system, venting at high points, and avoiding damage to equipment and pipelines, thus preventing safety accidents. By setting up an inlet pipe 3, an adsorption treatment system, and an exhaust pipe 6, the tail gas can be further treated, adsorbing hydrogen sulfide, methane, and methanol in the tail gas, ultimately ensuring that the non-methane total hydrocarbon content in the tail gas meets the requirements, and the tail gas is discharged in compliance with standards, achieving deep removal of methanol and other VOCs from the low-temperature methanol washing tail gas. By setting up a first adsorption tank 4 and a second adsorption tank 5 in parallel, one can be used and the other can be kept on standby. When the adsorption effect decreases, the standby adsorption tank can be switched to achieve uninterrupted continuous adsorption, and the internal packing of the old adsorption tank can be replaced. The overall system structure of this utility model is simple and clear, easy to operate and maintain. The connection between each component adopts a standardized design, which facilitates replacement and maintenance, and reduces operation and maintenance costs.

[0021] like Figure 2 As shown, the first adsorption tank 4 has two layers of trays 7 arranged from top to bottom. Both trays 7 are filled with activated carbon adsorbent. Refractory balls with a particle size of 25mm are placed on the top and bottom of the activated carbon adsorbent. A 100-mesh stainless steel wire mesh is placed between the activated carbon adsorbent and the refractory balls. The activated carbon adsorbent particle size on the upper tray 7 is 3.0–4.5mm, and the activated carbon adsorbent particle size on the lower tray 7 is 6–8mm. The second adsorption tank 5 is identical to the first adsorption tank 4. By setting up the trays 7, the adsorbent in different layers can be separated, facilitating cleaning and replacement by staff. The particle size of the activated carbon adsorbent increases from top to bottom, improving adsorption efficiency and effect. The activated carbon adsorbent is non-toxic and harmless, requires no large amounts of chemical solvents, produces no chemical reaction byproducts, avoids secondary pollution, and has a higher adsorption capacity.

[0022] like Figure 1 and Figure 2 As shown, the intake pipe 3 is connected to the air inlets at the top of the first adsorption tank 4 and the second adsorption tank 5 via two sets of intake branch pipes 8, respectively. The exhaust ports at the bottom of the first adsorption tank 4 and the second adsorption tank 5 are connected to the first end of the exhaust pipe 6 via two sets of exhaust branch pipes 9, respectively. The second end of the exhaust pipe 6 is connected to the tailpipe 2. By setting the intake branch pipes 8 and the exhaust branch pipes 9, the first adsorption tank 4 and the second adsorption tank 5 can be set up in parallel, achieving one in use and one on standby.

[0023] like Figure 1 As shown, the intake pipe 3 is equipped with an inlet master valve 10, and the exhaust pipe 6 is equipped with an outlet master valve 11. By setting the inlet master valve 10 and the outlet master valve 11, it is convenient to switch the adsorption treatment system to adsorb hydrogen sulfide, methane, and methanol in the exhaust gas, so that the non-methane total hydrocarbon content in the exhaust gas meets the requirements.

[0024] like Figure 1 As shown, both sets of intake branch pipes 8 are equipped with inlet valves 12, and both sets of exhaust branch pipes 9 are equipped with outlet valves 13. By setting inlet valves 12 and outlet valves 13, the first adsorption tank 4 and the second adsorption tank 5 can be switched, and the standby adsorption tank can be switched when the adsorption effect decreases, so as to achieve uninterrupted continuous adsorption. At the same time, the internal packing of the old adsorption tank can be replaced.

[0025] like Figure 1 As shown, a main exhaust gas outlet valve 14 is installed on the exhaust gas pipe 2 between the exhaust gas washing tower 1 and the exhaust pipe 6. By setting the main exhaust gas outlet valve 14, it can be opened to release excess exhaust gas when the pressure is too high, and can be closed after the pressure returns to normal, switching to the adsorption treatment system for further treatment of the exhaust gas.

[0026] like Figure 1As shown, an online pressure drop monitoring module 15 is provided at the end of the exhaust pipe 2. The online pressure drop monitoring module 15 has a built-in pressure sensor and a threshold judgment unit. The pressure sensor can collect the gas pressure data at the end of the exhaust pipe 2 in real time, and at the same time obtain the pressure data at the inlet of the adsorption treatment system through the correlation system. The difference between the two, that is, the pressure drop, can be calculated. The threshold judgment unit can determine the pressure drop and the preset threshold, thereby determining the adsorption effect of the adsorbent. By setting up an online pressure drop monitoring module 15, the exhaust gas can be monitored online. When the activated carbon adsorbent in the first adsorption tank 4 or the second adsorption tank 5 is in an effective adsorption state, the VOCs in the exhaust gas are adsorbed, the resistance of the exhaust gas flowing through the adsorbent is stable, and the pressure drop is maintained within the preset normal range. As the adsorbent gradually becomes saturated, its adsorption capacity for VOCs decreases, the resistance of the gas flowing through the adsorbent decreases, and the pressure drop deviates from the normal range, specifically manifested as a decrease. When the pressure drop detected by the threshold judgment unit built into the online pressure drop monitoring module 15 is continuously lower than the preset threshold, it is determined that the adsorbent adsorption effect has decreased, and an early warning signal is issued. The early warning signal can be an audible and visual alarm or a system signal transmission, prompting the operator to switch to the backup adsorption tank, such as switching from the first adsorption tank 4 to the second adsorption tank 5. At the same time, the adsorbent in the failed adsorption tank can be replaced to ensure continuous and compliant exhaust gas treatment.

[0027] In use, the exhaust gas washed by the exhaust gas washing tower 1 enters the first adsorption tank 4 sequentially through the inlet pipe 3 and the inlet branch pipe 8. The activated carbon adsorbent inside adsorbs the target VOCs in the exhaust gas. The qualified exhaust gas enters the exhaust pipe 2 through the exhaust branch pipe 9 and is vented at a high point through the exhaust pipe 2. When the online pressure drop monitoring module 15 warns of a decrease in adsorption effect, the inlet valve 12 and outlet valve 13 on both sides of the first adsorption tank 4 are closed, and the inlet valve 12 and outlet valve 13 on both sides of the second adsorption tank 5 are opened, switching to the second adsorption tank 5 for exhaust gas treatment. At this time, the staff can replace the activated carbon adsorbent in the first adsorption tank 4. After the replacement is completed, the first adsorption tank 4 is used as a backup.

[0028] The descriptions of the orientation or relative positional relationships of the structure in this utility model, such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer", are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A activated carbon adsorption treatment system for water gas purification tail gas, comprising a tail gas scrubbing tower (1), wherein the exhaust port of the tail gas scrubbing tower (1) is provided with a tail gas pipe (2), characterized in that: It also includes an adsorption treatment system. The exhaust port of the tail gas washing tower (1) is connected to the adsorption treatment system through the air inlet pipe (3). The adsorption treatment system includes a first adsorption tank (4) and a second adsorption tank (5). The first adsorption tank (4) and the second adsorption tank (5) are arranged in parallel. The exhaust port of the adsorption treatment system is connected to the tail gas pipe (2) through the exhaust pipe (6).

2. The activated carbon adsorption treatment system for water gas purification tail gas according to claim 1, characterized in that: The first adsorption tank (4) is provided with several layers of trays (7), and adsorbent is provided between the trays (7). The second adsorption tank (5) is exactly the same as the first adsorption tank (4).

3. The activated carbon adsorption treatment system for water gas purification tail gas according to claim 1, characterized in that: The intake pipe (3) is connected to the intake ports of the first adsorption tank (4) and the second adsorption tank (5) through two sets of intake branch pipes (8). The exhaust ports of the first adsorption tank (4) and the second adsorption tank (5) are connected to the first end of the exhaust pipe (6) through two sets of exhaust branch pipes (9). The second end of the exhaust pipe (6) is connected to the tailpipe (2).

4. The activated carbon adsorption treatment system for water gas purification tail gas according to claim 3, characterized in that: An inlet main valve (10) is provided on the air intake pipe (3), and an outlet main valve (11) is provided on the exhaust pipe (6).

5. The activated carbon adsorption treatment system for water gas purification tail gas according to claim 4, characterized in that: Both sets of intake manifolds (8) are equipped with inlet valves (12), and both sets of exhaust manifolds (9) are equipped with outlet valves (13).

6. The activated carbon adsorption treatment system for water gas purification tail gas according to claim 5, characterized in that: A main exhaust valve (14) is installed on the exhaust pipe (2) between the exhaust water scrubbing tower (1) and the exhaust pipe (6).

7. The activated carbon adsorption treatment system for water gas purification tail gas according to any one of claims 1 to 6, characterized in that: An online pressure drop monitoring module (15) is provided at the end of the exhaust pipe (2).

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