Coke oven gas deoiling and naphthalene-removing system

Abstract

The utility model belongs to the technical field of coke oven gas treatment, and particularly relates to a coke oven gas deoiling and naphthalene-removing system which comprises a methanol rectification residual liquid supply pipeline, an ammonia distillation wastewater supply pipeline, a residual liquid mixer and a deoiling and naphthalene-removing tower, a circulating box is arranged at the bottom of the deoiling and naphthalene-removing tower, and a gas inlet and a liquid supplementing opening are formed in the lower end of the side wall of the deoiling and naphthalene-removing tower; a gas outlet is formed in the top of the deoiling and naphthalene-removing tower, a partition plate, a spray head assembly and a filler layer are mounted in the deoiling and naphthalene-removing tower, a plurality of filter cartridge demisters are fixedly connected to the partition plate, a methanol rectification residual liquid supply pipeline and an ammonia distillation wastewater supply pipeline are both communicated with a residual liquid mixer, and a liquid supplementing pipe is connected between the residual liquid mixer and a liquid supplementing opening; a main circulation pipeline is connected between the circulation box and the spray head assembly, at least one circulation assembly is connected to the main circulation pipeline, and a residual liquid discharging pipe is connected to the main circulation pipeline. The device disclosed by the utility model has a better removal effect on substances such as tar, naphthalene and the like, so that the influence on subsequent methanol production and preparation is reduced.

Description

Technical Field

[0001] The utility model relates to a coke oven gas deoiling and naphthalene removal system, belonging to the technical field of coke oven gas treatment. Background Art

[0002] Coke oven gas is a product produced during the coking process. Coke oven gas contains a large amount of harmful substances, such as oil smoke, benzene, naphthalene, etc. If it is directly discharged without treatment, it will cause great harm to the environment. In the prior art, the raw gas produced by the coke oven is usually sent to the methanol process for the preparation of methanol after purification. Before the preparation of methanol, it is necessary to use a de-oiling and de-naphthalene device to further remove tar, naphthalene and other substances in the gas. However, the existing de-oiling and de-naphthalene device only uses an adsorbent to adsorb and separate tar, naphthalene and other substances, and the removal effect of tar, naphthalene and other substances is not good. There are still many tar, naphthalene and other substances entrained in the gas, which has a great impact on the subsequent production and preparation of methanol, so there are great disadvantages. Utility Model Content

[0003] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a coke oven gas deoiling and naphthalene removing system which has a better removal effect on substances such as tar and naphthalene.

[0004] The coke oven gas de-oiling and naphthalene-removing system described in the utility model comprises a methanol distillation residual liquid supply pipeline, an ammonia evaporation wastewater supply pipeline, a residual liquid mixer and an oil-removing and naphthalene-removing tower, a circulation box is arranged at the bottom of the oil-removing and naphthalene-removing tower, an air inlet and a liquid replenishing port are arranged at the lower end of the side wall of the oil-removing and naphthalene-removing tower, an air outlet is arranged at the top of the oil-removing and naphthalene-removing tower, a partition plate, a nozzle assembly and a packing layer are sequentially installed inside the oil-removing and naphthalene-removing tower from top to bottom, a plurality of filter cartridge demisters penetrating the partition plate are fixedly connected, a methanol distillation residual liquid supply pipeline and an ammonia evaporation wastewater supply pipeline are respectively connected to each other, and a filter cartridge demister is fixedly connected to each other. The methanol distillation residual liquid delivery pipe and the ammonia wastewater delivery pipe are connected to the residual liquid mixer, a liquid replenishment pipe is connected between the residual liquid mixer and the liquid replenishment port, a main circulation pipeline is connected between the circulation box and the nozzle assembly, at least one group of circulation components is connected to the main circulation pipeline, the circulation component includes a branch circulation pipeline, and the branch circulation pipeline is sequentially connected with a liquid inlet circulation valve, a filter, a circulation pump, a circulation pressure gauge and a liquid outlet circulation valve from front to back, the main circulation pipeline is connected to a residual liquid discharge pipe at one end of the nozzle assembly, and the residual liquid discharge pipe is connected to a residual liquid discharge valve.

[0005] Furthermore, the de-oiling and de-naphthalene tower is provided with a pressure relief port, and the pressure relief port is connected to a water seal tank through a pressure relief pipe.

[0006] Furthermore, a regulating valve is provided on the methanol distillation residual liquid delivery pipe.

[0007] Furthermore, the circulation components are divided into two groups.

[0008] Furthermore, it also includes a desalted water supply pipeline, which is connected to a residual liquid mixing tank through a desalted water delivery pipe, the residual liquid mixer is connected to the residual liquid mixing tank through a residual liquid delivery pipe, the residual liquid delivery pipe is connected to a residual liquid control valve, the residual liquid mixing tank is connected to a main spray pipeline, the main spray pipeline is connected to at least one group of spray components, the spray components include branch spray pipelines, the branch spray pipelines are sequentially connected with a liquid inlet spray valve, a spray pump, a spray pressure gauge and a liquid outlet spray valve from front to back, a flushing pipe is connected between the end of the main spray pipeline and each filter cartridge demister, and each flushing pipe is connected to a flushing valve.

[0009] Furthermore, the spray components are divided into two groups.

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

[0011] The coke oven gas deoiling and naphthalene removal system described in the utility model sprays and dissolves the coke oven gas through methanol distillation residual liquid and ammonia evaporation waste water, thereby eliminating tar, naphthalene, dust and other substances in the coke oven gas. On the one hand, the waste liquid is reused to make the waste liquid a resource, and on the other hand, the removal effect of tar, naphthalene and other substances is better; and, the tar, naphthalene and other substances can be adsorbed by the filter cartridge demister, further improving the removal effect of tar, naphthalene and other substances, thereby reducing the impact on subsequent methanol production and preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] In the figure: 1. circulation box; 2. air inlet; 3. de-oiling and naphthalene removal tower; 4. main circulation pipeline; 5. branch circulation pipeline; 6. liquid inlet circulation valve; 7. filter; 8. circulation pump; 9. circulation pressure gauge; 10. liquid outlet circulation valve; 11. residual liquid discharge valve; 12. residual liquid discharge pipe; 13. packing layer; 14. nozzle assembly; 15. partition; 16. filter cartridge demister; 17. air outlet; 18. water seal tank; 19. pressure relief pipe; 20. pressure relief port; 21. flushing pipe; 22. liquid replenishment port; 23. liquid replenishment pipe; 24. Main spray pipeline; 25. Branch spray pipeline; 26. Liquid inlet spray valve; 27. Spray pump; 28. Spray pressure gauge; 29. ​​Liquid outlet spray valve; 30. Residual liquid mixing tank; 31. Demineralized water delivery pipe; 32. Demineralized water supply pipe; 33. Residual liquid delivery pipe; 34. Residual liquid control valve; 35. Ammonia evaporation wastewater supply pipeline; 36. Ammonia evaporation wastewater delivery pipe; 37. Residual liquid mixer; 38. Regulating valve; 39. Methanol distillation residual liquid delivery pipe; 40. Methanol distillation residual liquid supply pipeline; 41. Flushing valve. DETAILED DESCRIPTION

[0014] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0015] Embodiment 1:

[0016] like Figure 1 As shown, the coke oven gas de-oiling and naphthalene removal system described in the utility model comprises a methanol distillation residual liquid supply pipeline 40, an ammonia evaporation wastewater supply pipeline 35, a residual liquid mixer 37 and a de-oiling and naphthalene removal tower 3, a circulation box 1 is provided at the bottom of the de-oiling and naphthalene removal tower 3, an air inlet 2 and a liquid replenishing port 22 are provided at the lower end of the side wall of the de-oiling and naphthalene removal tower 3, an air outlet 17 is provided at the top of the de-oiling and naphthalene removal tower 3, a partition 15, a nozzle assembly 14 and a packing layer 13 are sequentially installed inside the de-oiling and naphthalene removal tower 3 from top to bottom, a plurality of filter cartridge demisters 16 penetrating the partition 15 are fixedly connected to the partition 15, and the methanol distillation residual liquid supply pipeline 40 and the ammonia evaporation wastewater supply pipeline 35 are respectively connected to each other. The methanol distillation residual liquid delivery pipe 39 is connected to the ammonia evaporation wastewater delivery pipe 36 to the residual liquid mixer 37, a liquid replenishment pipe 23 is connected between the residual liquid mixer 37 and the liquid replenishment port 22, a main circulation pipeline 4 is connected between the circulation box 1 and the nozzle assembly 14, at least one group of circulation components is connected to the main circulation pipeline 4, and the circulation component includes a branch circulation pipeline 5, and the branch circulation pipeline 5 is sequentially connected with a liquid inlet circulation valve 6, a filter 7, a circulation pump 8, a circulation pressure gauge 9 and a liquid outlet circulation valve 10 from front to back, and the main circulation pipeline 4 is connected to a residual liquid discharge pipe 12 at one end of the nozzle assembly 14, and the residual liquid discharge pipe 12 is connected to a residual liquid discharge valve 11.

[0017] When in use, the methanol distillation residual liquid supply pipeline 40 and the ammonia vapor wastewater supply pipeline 35 supply methanol distillation residual liquid and ammonia vapor wastewater to the residual liquid mixer 37 through the methanol distillation residual liquid delivery pipe 39 and the ammonia vapor wastewater delivery pipe 36 respectively. Then the residual liquid mixer 37 mixes the methanol distillation residual liquid and the ammonia vapor wastewater, and then replenishes the mixed residual liquid into the circulation box 1 through the liquid replenishing pipe 23 and the liquid replenishing port 22. Under the action of the circulation pump 8, the mixed residual liquid enters the nozzle assembly 14 through the main circulation pipeline 4 and the branch circulation pipeline 5 for spraying. By adjusting the liquid outlet circulation valve 10, under the indication of the circulation pressure gauge 9, the outlet working pressure of the circulation pump 8 can be adjusted to the target value. When the residual liquid level in the circulation box 1 is too high, the residual liquid discharge valve is opened. 11, the residual liquid can be discharged to reduce the residual liquid level in the circulation box 1 to the target position; the coke oven gas enters the de-oiling and naphthalene removing tower 3 through the air inlet 2, and the tar, naphthalene, dust and other substances in the coke oven gas contact with the spray liquid and dissolve in the spray liquid, and fall into the circulation box 1 with the spray liquid. The packing layer 13 can increase the residence time of the coke oven gas in the de-oiling and naphthalene removing tower 3, so that the coke oven gas is fully in contact with the spray liquid, thereby ensuring the elimination effect of tar, naphthalene and other substances. The filter cartridge demister 16 can absorb the mist generated by the spray, thereby adsorbing the tar, naphthalene and other substances mixed in the mist, further improving the elimination effect of tar, naphthalene and other substances, and then, the coke oven gas after eliminating the tar, naphthalene and other substances is discharged through the air outlet 17.

[0018] The coke oven gas deoiling and naphthalene removal system described in the utility model sprays and dissolves the coke oven gas through the methanol distillation residual liquid and the ammonia vapor waste water, thereby eliminating tar, naphthalene, dust and other substances in the coke oven gas. On the one hand, the waste liquid is reused to make the waste liquid a resource, and on the other hand, the removal effect of tar, naphthalene and other substances is better; and, the filter cartridge demister 16 can adsorb tar, naphthalene and other substances, further improving the removal effect of tar, naphthalene and other substances, thereby reducing the impact on subsequent methanol production and preparation.

[0019] Embodiment 2:

[0020] As Figure 1 As shown, based on Example 1,

[0021] Furthermore, the de-oiling and naphthalene-removing tower 3 is provided with a pressure relief port 20, which is connected to a water seal tank 18 through a pressure relief pipe 19, and can be used to relieve pressure when the pressure in the de-oiling and naphthalene-removing tower 3 is too high, thereby playing a safety protection role;

[0022] Furthermore, a regulating valve 38 is provided on the methanol distillation residue delivery pipe 39. Since the temperature of the ammonia wastewater is about 40°C and the methanol distillation residue is about 110°C, the supply amount of the methanol distillation residue can be adjusted by adjusting the regulating valve 38, thereby adjusting the temperature of the mixed liquid to control the mixed liquid between 60°C and 80°C, which is beneficial to improving the dissolution effect of substances such as tar and naphthalene.

[0023] Furthermore, the circulation components are divided into two groups, so that when one group is under maintenance, the other group can work normally, thus ensuring the normal operation of the system;

[0024] Furthermore, it also includes a desalted water supply pipeline 32, the desalted water supply pipeline 32 is connected to a residual liquid mixing tank 30 through a desalted water delivery pipe 31, the residual liquid mixer 37 is connected to the residual liquid mixing tank 30 through a residual liquid delivery pipe 33, the residual liquid delivery pipe 33 is connected to a residual liquid control valve 34, the residual liquid mixing tank 30 is connected to a main spray pipeline 24, the main spray pipeline 24 is connected to at least one group of spray components, the spray components include a branch spray pipeline 25, the branch spray pipeline 25 is sequentially connected to a liquid inlet spray valve 26, a spray pump 27, a spray pressure gauge 28 and a liquid outlet spray valve 29 from front to back, a flushing pipe 21 is connected between the end of the main spray pipeline 24 and each filter cartridge demister 16, and each flushing pipe 21 is connected to a flushing valve 41. By opening the residual liquid control valve 34, the residual liquid mixer 37 can be The mixed residual liquid flows into the residual liquid mixing tank 30 through the residual liquid conveying pipe 33, and the desalted water supply pipe 32 can convey the desalted water to the residual liquid mixing tank 30 through the desalted water conveying pipe 31, so that the desalted water and the mixed residual liquid are mixed in the residual liquid mixing tank 30. When it is necessary to backwash a certain cartridge demister 16, the corresponding flushing valve 41 can be opened. Under the action of the spray pump 27, the mixed liquid in the residual liquid mixing tank 30 backwashes the cartridge demister 16 through the main spray pipeline 24, the branch spray pipeline 25 and the flushing pipe 21, thereby removing the tar, naphthalene and other substances adsorbed inside, and realizing online flushing of the system; at the same time, by adjusting the liquid outlet spray valve 29, the outlet working pressure of the spray pump 27 can be adjusted, and by observing the spray pressure gauge 28, it can be adjusted to the required spray pressure, so that the flushing pressure can be adjusted;

[0025] Furthermore, the spray components are divided into two groups, so when one group is being repaired, the other group can work normally, thus ensuring the normal operation of the system.

Claims

1. A coke oven gas deoiling and naphthalene removal system, characterized in that: The invention comprises a methanol distillation residual liquid supply pipeline (40), an ammonia evaporation waste water supply pipeline (35), a residual liquid mixer (37) and an oil-removing and naphthalene-removing tower (3). A circulation box (1) is provided at the bottom of the oil-removing and naphthalene-removing tower (3). An air inlet (2) and a liquid replenishing port (22) are provided at the lower end of the side wall of the oil-removing and naphthalene-removing tower (3). An air outlet (17) is provided at the top of the oil-removing and naphthalene-removing tower (3). A partition plate (15), a nozzle assembly (14) and a packing layer (13) are sequentially installed inside the oil-removing and naphthalene-removing tower (3) from top to bottom. A plurality of filter cartridge demisters (16) penetrating the partition plate (15) are fixedly connected to the partition plate (15). The methanol distillation residual liquid supply pipeline (40) and the ammonia evaporation waste water supply pipeline (35) are respectively connected to the methanol distillation residual liquid delivery pipe (39). A residual liquid mixer (37) is connected to the ammonia wastewater delivery pipe (36); a liquid replenishment pipe (23) is connected between the residual liquid mixer (37) and the liquid replenishment port (22); a main circulation pipeline (4) is connected between the circulation box (1) and the nozzle assembly (14); at least one group of circulation components is connected to the main circulation pipeline (4); the circulation components include a branch circulation pipeline (5); a liquid inlet circulation valve (6), a filter (7), a circulation pump (8), a circulation pressure gauge (9) and a liquid outlet circulation valve (10) are connected to the branch circulation pipeline (5) in sequence from front to back; a residual liquid discharge pipe (12) is connected to one end of the main circulation pipeline (4) located at the nozzle assembly (14); and a residual liquid discharge valve (11) is connected to the residual liquid discharge pipe (12).

2. The coke oven gas deoiling and naphthalene removal system according to claim 1, characterized in that: The de-oiling and naphthalene-removing tower (3) is provided with a pressure relief port (20), and the pressure relief port (20) is connected to a water seal tank (18) via a pressure relief pipe (19).

3. The coke oven gas deoiling and naphthalene removal system according to claim 1, characterized in that: The methanol distillation residual liquid delivery pipe (39) is provided with a regulating valve (38).

4. The coke oven gas deoiling and naphthalene removal system according to claim 1, characterized in that: The circulation components are divided into two groups.

5. The coke oven gas deoiling and naphthalene removal system according to any one of claims 1 to 4, characterized in that: The invention also comprises a demineralized water supply pipeline (32), the demineralized water supply pipeline (32) is connected to a residual liquid mixing tank (30) through a demineralized water delivery pipe (31), the residual liquid mixer (37) is connected to the residual liquid mixing tank (30) through a residual liquid delivery pipe (33), the residual liquid delivery pipe (33) is connected to a residual liquid control valve (34), the residual liquid mixing tank (30) is connected to a main spray pipeline (24), the main spray pipeline (24) is connected to at least one group of spray components, the spray components include a branch spray pipeline (25), the branch spray pipeline (25) is connected to a liquid inlet spray valve (26), a spray pump (27), a spray pressure gauge (28) and a liquid outlet spray valve (29) in sequence from front to back, a flushing pipe (21) is connected between the end of the main spray pipeline (24) and each filter cartridge demister (16), and each flushing pipe (21) is connected to a flushing valve (41).

6. The coke oven gas deoiling and naphthalene removal system according to claim 5, characterized in that: The spray components are divided into two groups.

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