Device for reducing resistance of gas desulfurization system

Abstract

The utility model discloses a device for reducing resistance of a coal gas desulfurization system, which is characterized in that a high-temperature compressed air outlet pipe is arranged at an outlet of an air compressor and is communicated with an air cooling mechanism and a high-temperature air conveying mechanism, and a low-temperature compressed air outlet pipe is arranged at an outlet of a compressed air storage tank in the air cooling mechanism; an outlet of a high-temperature compressed air leading-out branch pipe in the high-temperature air conveying mechanism is communicated with a low-temperature compressed air leading-out pipe, an outlet of the low-temperature compressed air leading-out pipe is communicated with a mixed compressed gas pipeline, the mixed compressed gas pipeline is communicated with a gas inlet of the regeneration tower, and an adjusting valve set is arranged on the mixed compressed gas pipeline. Part of the compressed air heat source is cooled and then mixed with high-temperature compressed air to enter the regeneration tower, the mixing proportion of the high-temperature compressed air and the low-temperature compressed air is adjusted to control the temperature of the compressed air to be 60 DEG C (+ / -5) so as to heat the desulfurization liquid circulating system, the temperature of desulfurization liquid is ensured to be more than 50 DEG C, and ammonium salt can be heated and decomposed in time; the resistance of the desulfurizing tower is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of forced air regeneration tower devices and packing tower resistance control, specifically relating to a device for reducing the resistance of a coal gas desulfurization system. Background Technology

[0002] Low-temperature carbonization of coal is one of the methods of coal carbonization. It uses a relatively low final heating temperature (500-600℃) to decompose coal under air-isolated conditions, producing semi-coke, low-temperature coal tar, coal gas, and pyrolysis water. The main components of the carbonized coal gas produced by the externally heated rotary kiln process are CH4: 26-30%, H2: 25-28%, CO2: 23-26%, CO: 8-12%, and small amounts of H2S and NH3.

[0003] The desulfurization system primarily removes hydrogen sulfide from the coal gas, ensuring that the coal gas supplied externally meets the required standards. It consists of a desulfurization system and a regeneration system. The main production process involves coal gas entering from the bottom of the desulfurization tower and exiting from the top. Desulfurization liquid is sprayed evenly from the top of the tower, contacting the coal gas counter-currently to wash and purify the hydrogen sulfide. The desulfurization-rich liquid, having absorbed hydrogen sulfide, is pumped from the bottom of the tower to the regeneration tower via a circulating pump. Compressed air is introduced from the bottom of the regeneration tower for oxidation and regeneration, and sulfur foam floats to the top. The regenerated desulfurization liquid then flows by gravity from the top of the regeneration tower back to the top of the desulfurization tower and is sprayed down for circulation. However, due to the high CO2 content in the coal gas, the desulfurization liquid absorbs a large amount of ammonia during circulation. This causes the ammonia in the desulfurization liquid to react easily with carbon dioxide in the coal gas during operation, producing ammonium salts (ammonium carbonate, ammonium bicarbonate) that adhere to the packing material of the desulfurization tower. Furthermore, the regeneration tower requires a continuous supply of compressed air for forced-air oxidation and regeneration during operation. The temperature of the desulfurization liquid circulation system remains below 35℃ for extended periods. Below 40℃, the ammonium salts decompose slowly, causing the resistance of the desulfurization tower to gradually increase, ultimately leading to blockage and preventing long-term stable operation. In particular, while the desulfurization liquid is heated to 60-80℃ via steam coils before being introduced into the circulation system for further heating, the large volume of desulfurization liquid (approximately 1100t) and small replacement rate (approximately 60t / d) result in ineffective heating and high steam consumption. Utility Model Content

[0004] The purpose of this invention is to provide a device for reducing the resistance of a coal gas desulfurization system, so as to solve the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An apparatus for reducing the resistance of a coal gas desulfurization system includes a desulfurization tower and a regeneration tower connected to each other. A gas pipeline is installed at the inlet of the regeneration tower. The apparatus also includes an air compressor, an air cooling mechanism, a high-temperature air conveying mechanism, and a mixed compressed gas pipeline. A high-temperature compressed air outlet pipe is installed at the outlet of the air compressor, and this outlet pipe is connected to both the air cooling mechanism and the high-temperature air conveying mechanism. The air cooling mechanism includes a compressed air dryer and a compressed air storage tank connected in sequence. A low-temperature compressed air outlet pipe is installed at the outlet of the compressed air storage tank. The high-temperature air conveying mechanism includes a high-temperature compressed air outlet branch pipe, the outlet of which is connected to the low-temperature compressed air outlet pipe. The outlet of the low-temperature compressed air outlet pipe is connected to the mixed compressed gas pipeline, which is connected to the inlet of the regeneration tower. A regulating valve assembly is installed on the mixed compressed gas pipeline.

[0007] To further realize this utility model, a low-temperature air control valve and a low-temperature air check valve are provided on the low-temperature compressed air outlet pipe, and a high-temperature air control valve is provided on the high-temperature compressed air outlet branch pipe. The low-temperature air control valve and the high-temperature air control valve are used to adjust the mixing ratio of high-temperature and low-temperature compressed air.

[0008] To further realize this utility model, the high-temperature air conveying mechanism also includes an air compressor vent valve and a branch pipe vent valve. The air compressor vent valve is installed on the high-temperature compressed air outlet pipe, and the branch pipe vent valve is installed on the high-temperature compressed air outlet branch pipe. The air compressor vent valve and the branch pipe vent valve are used to ensure that the air compressor's heat dissipation system is not affected.

[0009] To further realize this utility model, the outlet end of the compressed air storage tank is also provided with other users' compressed air pipelines, and other users' compressed air pipelines are equipped with control valves.

[0010] To further realize this utility model, a desulfurization rich liquid pipeline is provided at the bottom of the desulfurization tower and connected to the inlet of the regeneration tower. A desulfurization liquid circulation pump is provided on the desulfurization rich liquid pipeline, and a regenerated desulfurization liquid pipeline is provided at the top of the regeneration tower and connected to the inlet of the desulfurization tower.

[0011] To further realize this utility model, control valves are respectively installed at the inlet and outlet of the desulfurization liquid circulation pump, and control valves are also installed on the desulfurization liquid pipeline after regeneration.

[0012] To further realize this utility model, a gas discharge pipeline and a gas inlet pipeline are respectively provided at the top and bottom of the desulfurization tower.

[0013] The advantages of this utility model compared to the prior art are as follows:

[0014] This invention addresses the current operating process of a desulfurization system. Since the air temperature discharged from the air compressor is around 135℃, the compressed air heat source can be effectively utilized to raise the temperature of the desulfurization liquid. Specifically, high-temperature compressed air is drawn from the air compressor outlet, a portion of which is cooled before being mixed with other high-temperature compressed air and fed into the regeneration tower for forced-air oxidation regeneration. By adjusting the mixing ratio of high-temperature and low-temperature compressed air, the temperature of the compressed air entering the regeneration tower is controlled at 60℃ (±5℃) to heat the desulfurization liquid circulation system, ensuring that the desulfurization liquid temperature is above 50℃, allowing ammonium salts to decompose promptly and reducing the resistance of the desulfurization tower. Simultaneously, a low-temperature air check valve is installed in the cold air main pipe to prevent hot air backflow from affecting other processes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] The meanings of the reference numerals in the attached diagram are as follows: 1. Air compressor; 2. Mixed compressed gas pipeline; 3. High-temperature compressed air outlet pipe; 4. Compressed air dryer / cooler; 5. Compressed air storage tank; 6. Low-temperature compressed air outlet pipe; 7. High-temperature compressed air outlet branch pipe; 9. Regulating valve assembly; 10. Low-temperature air control valve; 11. Low-temperature air check valve; 12. High-temperature air control valve; 13. Air compressor vent valve; 14. Outlet branch pipe vent valve; 15. Other user compressed air pipelines; 16. Control valve; 17. Desulfurization tower; 18. Desulfurization rich liquid pipeline; 19. Regeneration tower; 20. Desulfurization liquid circulation pump; 21. Regenerated desulfurization liquid pipeline; 22. Coal gas discharge pipeline; 23. Coal gas inlet pipeline. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1As shown, an apparatus for reducing the resistance of a coal gas desulfurization system includes a desulfurization tower and a regeneration tower connected to each other. A gas pipeline is installed at the inlet of the regeneration tower. A desulfurization rich liquid pipeline 18 is installed at the bottom of the desulfurization tower 17 and connected to the liquid inlet of the regeneration tower 19. A desulfurization liquid circulation pump 20 is installed on the desulfurization rich liquid pipeline 18. A regenerated desulfurization liquid pipeline 21 is installed at the top of the regeneration tower 19 and connected to the liquid inlet of the desulfurization tower 17. Control valves 16 are respectively installed at the inlet and outlet of the desulfurization liquid circulation pump 20. A control valve 16 is also installed on the desulfurization liquid pipeline 21. A gas discharge pipeline 22 and a gas inlet pipeline 23 are respectively installed at the top and bottom of the desulfurization tower 17. The device also includes an air compressor 1, an air cooling mechanism, a high-temperature air conveying mechanism, and a mixed compressed gas pipeline 2. A high-temperature compressed air outlet pipe 3 is installed at the outlet end of the air compressor 1. The high-temperature compressed air outlet pipe 3 is connected to the air cooling mechanism and the high-temperature air conveying mechanism respectively. The air cooling mechanism includes compressed air dryers connected in sequence. 4 and compressed air storage tank 5. The outlet end of compressed air storage tank 5 is provided with a low temperature compressed air outlet pipe 6. The low temperature compressed air outlet pipe 6 is provided with a low temperature air control valve 10 and a low temperature air check valve 11. The outlet end of compressed air storage tank 5 is also provided with other user compressed air pipelines 15. Other user compressed air pipelines 15 are provided with control valves 16. The high temperature air conveying mechanism includes a high temperature compressed air outlet branch pipe 7, an air compressor vent valve 13 and an outlet branch pipe vent valve 14. The high temperature compressed air outlet branch pipe 7 is provided with a high temperature air control valve 12. The air compressor vent valve 13 is provided on the high temperature compressed air outlet pipe 3. The outlet branch pipe vent valve 14 is provided on the high temperature compressed air outlet branch pipe 7. The outlet end of the high temperature compressed air outlet branch pipe 7 is connected to the low temperature compressed air outlet pipe 6. The outlet end of the low temperature compressed air outlet pipe 6 is connected to the mixed compressed gas pipeline 2. The mixed compressed gas pipeline 2 is connected to the air inlet of the regeneration tower 19. The mixed compressed gas pipeline 2 is provided with a regulating valve group 9.

[0019] After passing through the air filter, the air enters the air compressor 1 and is pressurized. One of the high-temperature compressed air is transported to the compressed air dryer 4 via the high-temperature compressed air outlet pipe 3 for drying and cooling. The cooled compressed air is stored and stabilized in the compressed air storage tank 5 and then distributed to each user via the other user's compressed air pipeline 15. One of the compressed air is output from the low-temperature compressed air outlet pipe 6, and the other of the high-temperature compressed air is transported via the high-temperature compressed air outlet branch pipe 7 and connected to the low-temperature compressed air outlet pipe 6. The high-temperature air control valve 12 and the low-temperature air control valve 10 adjust the opening of the high-temperature compressed air outlet branch pipe 7 and the low-temperature compressed air outlet pipe 6 respectively to control the temperature of the mixed compressed air at 60℃ (±5) to heat the desulfurization liquid circulation system, ensuring that the temperature of the desulfurization liquid is above 50℃, so that the ammonium salt can be decomposed by heat in time, thereby reducing the resistance of the desulfurization tower.

[0020] The low-temperature air check valve 11 is located between the low-temperature air control valve 10 and the connection between the high-temperature compressed air outlet branch pipe 7 and the low-temperature compressed air outlet pipe 6 to prevent high-temperature compressed air or mixed compressed gas from flowing back into the low-temperature compressed air outlet pipe 6 and affecting other users.

[0021] The desulfurization tower 17 absorbs hydrogen sulfide in the rich desulfurization liquid and transports it from the bottom of the tower to the regeneration tower 19 via the desulfurization liquid circulation pump 20 through the rich desulfurization liquid pipeline 18. Compressed air is introduced from the bottom of the regeneration tower 19 through the mixed compressed gas pipeline 2 for oxidation regeneration. The regenerated desulfurization liquid flows by gravity from the top of the regeneration tower 19 to the top of the desulfurization tower 17 and comes into countercurrent contact with the coal gas entering from the bottom of the desulfurization tower 17 through the coal gas inlet pipeline 23 to wash and purify the hydrogen sulfide in the coal gas.

Claims

1. A device for reducing the resistance of a coal gas desulfurization system, comprising a desulfurization tower and a regeneration tower in communication with each other, a gas pipeline being provided at the gas inlet of the regeneration tower, characterized in that: It also includes air compressor (1), air cooling mechanism, high temperature air conveying mechanism and mixed compressed gas pipeline (2), the outlet end of the air compressor (1) is provided with high temperature compressed air outlet pipe (3), high temperature compressed air outlet pipe (3) is communicated with air cooling mechanism and high temperature air conveying mechanism respectively, air cooling mechanism includes compressed air drying cooler (4) and compressed air storage tank (5) communicated in sequence, the outlet end of compressed air storage tank (5) is provided with low temperature compressed air outlet pipe (6), high temperature air conveying mechanism includes high temperature compressed air outlet branch pipe (7), the outlet end of high temperature compressed air outlet branch pipe (7) is communicated with low temperature compressed air outlet pipe (6), the outlet end of low temperature compressed air outlet pipe (6) is communicated with mixed compressed gas pipeline (2), mixed compressed gas pipeline (2) is communicated with the gas inlet of regenerator (19), and the adjusting valve group (9) is arranged on the mixed compressed gas pipeline (2).

2. The device for reducing the resistance of a coal gas desulfurization system of claim 1, wherein: The low temperature air control valve (10) and the low temperature air check valve (11) are arranged on the low temperature compressed air outlet pipe (6), and the high temperature air control valve (12) is arranged on the high temperature compressed air outlet branch pipe (7).

3. The device for reducing the resistance of a coal gas desulfurization system according to claim 1 or 2, characterized in that: The high temperature air conveying mechanism further includes air compressor vent valve (13) and outlet branch pipe vent valve (14), the air compressor vent valve (13) is arranged on the high temperature compressed air outlet pipe (3), and the outlet branch pipe vent valve (14) is arranged on the high temperature compressed air outlet branch pipe (7).

4. The device for reducing the resistance of a coal gas desulfurization system of claim 3, wherein: The outlet end of the compressed air storage tank (5) is also provided with other user compressed air pipeline (15), and the control valve (16) is arranged on the other user compressed air pipeline (15).

5. The device for reducing the resistance of a coal gas desulfurization system of claim 4, wherein: The bottom of the desulfurization tower (17) is provided with desulfurization rich liquid pipeline (18) communicated with the liquid inlet of regenerator (19), and the desulfurization liquid circulating pump (20) is arranged on the desulfurization rich liquid pipeline (18), and the top of the regenerator (19) is provided with regenerated desulfurization liquid pipeline (21) communicated with the liquid inlet of desulfurization tower (17).

6. The device for reducing the resistance of a coal gas desulfurization system of claim 5, wherein: The inlet end and the outlet end of the desulfurization liquid circulating pump (20) are respectively provided with control valves (16), and the regenerated desulfurization liquid pipeline (21) is also provided with control valve (16).

7. The device for reducing the resistance of a coal gas desulfurization system of claim 6, wherein: The top end and the bottom end of the desulfurization tower (17) are respectively provided with gas discharge pipeline (22) and gas inlet pipeline (23).

Images