Cooling tower for gas purification

Abstract

The utility model discloses a cooling tower for coal gas purification, which comprises a vertical tower and a circulating box, a coal gas dispersing disc, an ammonia water spraying pipe, a zeolite filtering layer and a clear water spraying pipe are arranged in the vertical tower from bottom to top, the coal gas dispersing disc is communicated with a coal gas inlet pipe, the clear water spraying pipe is communicated with a clear water inlet pipe, and the top of the vertical tower is communicated with a coal gas outlet pipe. A drain pipe at the bottom of the vertical tower is communicated with a water inlet pipe of a circulating box, a water outlet pipe of the circulating box is communicated with an ammonia water spraying pipe, an ammonia concentration sensor and a three-way valve are arranged between the circulating box and the ammonia water spraying pipe, another passage of the three-way valve is communicated with an ammonia water pipe, and an ammonia gas dispersing disc is arranged in the circulating box and is communicated with an ammonia gas pipe; the bottom of the circulating box communicates with a wastewater pipe. The ammonia water spraying pipe is arranged, dust and sulfur-containing impurities in coal gas can be removed through ammonia water, meanwhile, the preliminary cooling function is achieved, meanwhile, the zeolite filtering layer is arranged, ammonia in the coal gas can be adsorbed, and meanwhile the ammonia amount caused by heating of the ammonia water is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature raw coal gas cooling, in particular to a cooling tower for coal gas purification. Background Art

[0002] Raw coal gas refers to the mixture of coal gas from the coke oven gas collecting pipe with tar and ammonia impurities. Generally, it needs to be cooled, detarred, desulfurized, deaminated, final cooled, debenzenized and other processes to finally obtain clean coal gas. The commonly used process of coal gas washing and initial cooling is to use the countercurrent contact of circulating condensate and ammonia to remove tar, coal powder and other impurities in the coal gas. However, the current process and equipment have certain defects. For example, the initial raw coal gas temperature is high. When it comes into contact with ammonia, it will heat the ammonia, causing the ammonia in the ammonia to escape into the coal gas, increasing the workload of the deammoniation process during subsequent treatment, resulting in an increase in the production cost of coal gas. Therefore, it is necessary to develop a cooling tower with a certain ammonia treatment capacity when the coal gas is initially cooled to meet the needs. Utility Model Content

[0003] In view of the above technical problems, the utility model provides a cooling tower for gas purification.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a cooling tower for gas purification, comprising a vertical tower and a circulation box, wherein a gas diffuser, an ammonia water spray pipe, a zeolite filter layer and a clean water spray pipe are arranged from bottom to top in the vertical tower, the gas diffuser is connected to the gas inlet pipe, the clean water spray pipe is connected to the clean water inlet pipe, the top of the vertical tower is connected to the gas outlet pipe, the drain pipe at the bottom of the vertical tower is connected to the water inlet pipe of the circulation box, the water outlet pipe of the circulation box is connected to the ammonia water spray pipe, an ammonia concentration sensor and a three-way valve are arranged between the circulation box and the ammonia water spray pipe, the other passage of the three-way valve is connected to the ammonia water pipe, an ammonia diffuser is arranged in the circulation box, the ammonia diffuser is connected to the ammonia pipe, and the bottom of the circulation box is connected to the wastewater pipe.

[0005] Furthermore, a first upper water level sensor and a first lower water level sensor are provided at the lower part of the vertical tower.

[0006] Furthermore, a second upper water level sensor and a second lower water level sensor are provided in the circulation box.

[0007] Furthermore, a first air pump is provided between the gas inlet pipe and the vertical tower, and a second air pump is provided between the vertical tower and the gas outlet pipe.

[0008] Furthermore, a one-way valve is provided between the gas inlet pipe and the vertical tower.

[0009] Furthermore, a first water pump is provided between the circulation box and the three-way valve, and a second water pump is provided between the circulation box and the waste water pipe.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] 1. The utility model is provided with an ammonia water spray pipe, which can utilize ammonia water to remove dust and sulfur-containing impurities in coal gas and has a preliminary cooling function. A zeolite filter layer is provided to absorb ammonia in coal gas and reduce the amount of ammonia gas caused by the heating of ammonia water. A circulation box is provided to reuse the ammonia water used for washing and reduce the operating cost. A clean water spray pipe is provided to further reduce the temperature of coal gas and flush the zeolite layer to extend the use time.

[0012] 2. The utility model is provided with a water level sensor, which can monitor the water level of the vertical tower and the circulation box to prevent the water level from being too high or too low. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model.

[0014] Figure 2 It is a schematic diagram of the vertical tower structure of the utility model.

[0015] Figure 3 This is a schematic diagram of the structure of the circulation box of the utility model.

[0016] Among them: 1. vertical tower, 2. clean water inlet pipe, 3. second air pump, 4. gas outlet pipe, 5. three-way valve, 6. ammonia pipe, 7. circulation box, 8. ammonia diffuser, 9. ammonia pipe, 10. wastewater pipe, 11. second water pump, 12. first water pump, 13. one-way valve, 14. first air pump, 15. gas inlet pipe, 16. clean water sprinkler pipe, 17. zeolite filter layer, 18. ammonia spray pipe, 19. first upper water level sensor, 20. first lower water level sensor, 21. gas diffuser, 22. second upper water level sensor, 23. second lower water level sensor, 24. ammonia concentration sensor. DETAILED DESCRIPTION

[0017] The utility model will be further described below in conjunction with the accompanying drawings.

[0018] like Figure 1-Figure 3A cooling tower for gas purification shown in the figure includes a vertical tower 1 and a circulation box 7. A gas diffuser 21, an ammonia water spray pipe 18, a zeolite filter layer 17 and a clean water spray pipe 16 are arranged from bottom to top in the vertical tower 1. The gas diffuser 21 is connected to the gas inlet pipe 15, and the clean water spray pipe 16 is connected to the clean water inlet pipe 2. The top of the vertical tower 1 is connected to the gas outlet pipe 4, and the drainage pipe at the bottom of the vertical tower 1 is connected to the water inlet pipe of the circulation box 7. The water outlet pipe of the circulation box 7 is connected to the ammonia water spray pipe 18. An ammonia concentration sensor 24 and a three-way valve 5 are arranged between the circulation box 7 and the ammonia water spray pipe 18. The other passage of the three-way valve 5 is connected to the ammonia water pipe 6. An ammonia diffuser 8 is arranged in the circulation box 7, and the ammonia diffuser 8 is connected to the ammonia pipe 9. The bottom of the circulation box 7 is connected to the wastewater pipe 10.

[0019] It should be noted that the circulation box 7 is provided with a water intake valve for detecting water components.

[0020] In order to keep the water level in the vertical tower 1 stable, a first upper water level sensor 19 and a first lower water level sensor 20 are provided at the lower part of the vertical tower 1 .

[0021] In order to keep the water level in the circulation box 7 stable, a second upper water level sensor 22 and a second lower water level sensor 23 are provided in the circulation box 7 .

[0022] In order to ensure smooth circulation of coal gas, a first air pump 14 is provided between the coal gas inlet pipe 15 and the vertical tower 1 , and a second air pump 3 is provided between the vertical tower 1 and the coal gas outlet pipe 4 .

[0023] In order to prevent the gas from flowing back, a one-way valve 13 is provided between the gas inlet pipe 15 and the vertical tower 1 .

[0024] In order to facilitate smooth circulation of water, a first water pump 12 is provided between the circulation box 7 and the three-way valve 5 , and a second water pump 11 is provided between the circulation box 7 and the waste water pipe 10 .

[0025] The specific working process of the utility model is as follows:

[0026] The initial raw coal gas is introduced into the vertical tower 1 through the coal gas inlet pipe 15, and enters the coal gas dispersion plate 21 through the first air pump 14 and the one-way valve 13. After the coal gas escapes into the vertical tower 1, it is washed and cooled by the ammonia water in the vertical tower 1. The ammonia water spray pipe 18 sprays ammonia water for further washing. At this time, the coal gas and the ammonia gas overflowed by heating pass through the zeolite filter layer 17, and the ammonia gas is adsorbed by the zeolite filter layer 17. At this time, the coal gas is cooled again through the clean water spray pipe 16, and enters the coal gas outlet pipe 4 through the second air pump 3 for subsequent processing.

[0027] The water velocity of the clean water spray pipe 16 is lower than the water velocity of the ammonia water spray pipe 18, and the clean water also has the function of flushing the zeolite filter layer.

[0028] During circulation, the water in the vertical tower 1 is passed to the circulation box 7, and the water in the circulation box 7 enters the three-way valve 5 through the first water pump 12, and then enters the ammonia spray pipe 18. The ammonia concentration sensor 24 detects the ammonia concentration in the ammonia water. If the ammonia concentration is too low, ammonia is introduced into the ammonia diffuser 8 through the ammonia pipe 9 to increase the ammonia concentration. When it is detected that the water in the circulation box 7 needs to be discharged, the second water pump 11 is used to discharge the water to the wastewater pipe 10 for subsequent treatment.

[0029] When draining water, the three-way valve 5 is adjusted and ammonia water is supplied through the ammonia water pipe 6 .

[0030] In the above process, the first upper water level sensor 19 and the first lower water level sensor 20 monitor the water level in the vertical tower 1 ; the second upper water level sensor 22 and the second lower water level sensor 23 monitor the water level in the circulation box 7 .

Claims

1. A cooling tower for coal gas purification, comprising a vertical tower (1) and a circulation box (7), characterized in that: The vertical tower (1) is provided with a gas diffuser (21), an ammonia water spray pipe (18), a zeolite filter layer (17) and a clean water spray pipe (16) from bottom to top. The gas diffuser (21) is connected to the gas inlet pipe (15), the clean water spray pipe (16) is connected to the clean water inlet pipe (2), the top of the vertical tower (1) is connected to the gas outlet pipe (4), and the drainage pipe at the bottom of the vertical tower (1) is connected to the water inlet pipe of the circulation box (7). The water outlet pipe of the circulation box (7) is connected to the ammonia water spray pipe (18), an ammonia concentration sensor (24) and a three-way valve (5) are provided between the circulation box (7) and the ammonia water spray pipe (18), another passage of the three-way valve (5) is connected to the ammonia water pipe (6), an ammonia gas diffuser (8) is provided in the circulation box (7), the ammonia gas diffuser (8) is connected to the ammonia pipe (9), and the bottom of the circulation box (7) is connected to the wastewater pipe (10).

2. The gas purification cooling tower according to claim 1, characterized in that: The lower part of the vertical tower (1) is provided with a first upper water level sensor (19) and a first lower water level sensor (20).

3. The cooling tower for coal gas purification according to claim 1, characterized in that: A second upper water level sensor (22) and a second lower water level sensor (23) are provided in the circulation box (7).

4. The cooling tower for gas purification according to claim 1, characterized in that: A first air pump (14) is provided between the coal gas inlet pipe (15) and the vertical tower (1), and a second air pump (3) is provided between the vertical tower (1) and the coal gas outlet pipe (4).

5. The cooling tower for coal gas purification according to claim 1 or 4, characterized in that: A one-way valve (13) is provided between the gas inlet pipe (15) and the vertical tower (1).

6. The cooling tower for coal gas purification according to claim 1, characterized in that: A first water pump (12) is provided between the circulation box (7) and the three-way valve (5), and a second water pump (11) is provided between the circulation box (7) and the waste water pipe (10).

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