A tail gas treatment device for a coal coking exhaust pipe

Abstract

The utility model discloses a kind of tail gas treatment devices for coal coking exhaust flue, including upper exhaust flue, lower exhaust flue and dust removal pipeline, the upper portion in lower exhaust flue is provided with ring plate, vertical pipe is provided with lower port plugging on ring plate, the side wall of vertical pipe is uniformly distributed and tangentially arranged with several air injection ports, the bottom of vertical pipe is provided with blow-off pipe, vertical shaft is concentrically arranged in vertical pipe, multiple flaps are uniformly distributed on the upper end of vertical shaft, after the upper end of vertical shaft is inserted into dust removal pipeline, it is connected with central tube, the upper end of central tube is connected with hollow disc, multiple horizontal pipes with end plugging are uniformly distributed on the upper end of hollow disc, spray head is arranged on central tube and horizontal pipe, water delivery pipe is arranged on the dust removal pipeline above hollow disc, after the end of water delivery pipe is inserted into dust removal pipeline, it is downwardly bent and rotationally connected with hollow disc, dehumidifier is arranged in the dust removal pipeline above water delivery pipe. Above all, the utility model has the advantages of simple structure, stable operation and reducing environmental pollution.

Description

Technical Field

[0001] This utility model relates to the technical field of coal coking tail gas treatment equipment, specifically to a tail gas treatment device for coal coking flue gas pipelines. Background Technology

[0002] Coal coking, also known as coking or high-temperature carbonization, refers to the process of heating a specific type of coal to a high temperature of 950℃~1050℃ under air-isolated conditions. Through stages such as drying, pyrolysis, melting, bonding, solidification, and shrinkage, coke, coke oven gas, and various chemical products are ultimately obtained. It is an important process for the chemical processing and efficient utilization of coal and an indispensable key link in the modern steel industry. During coal coking production, exhaust gas undergoes large-scale baghouse dust collection and desulfurization / denitrification before being emitted to meet emission standards. In existing technologies, the exhaust gas can be discharged into the atmosphere through flue pipes after desulfurization and denitrification. However, in actual production, due to the environment of coal yards and coking plants, the particulate matter content in the emitted exhaust gas is high, polluting the environment and contradicting environmental protection principles. While existing desulfurization and denitrification processes can effectively reduce sulfides and nitrates in the exhaust gas, dust from the downstream flue pipes is released into the atmosphere with the exhaust gas, causing air pollution and contributing to smog. Therefore, it is an objective need to develop a tail gas treatment device for coal coking flue gas pipelines that is simple in structure, stable in operation, and can reduce environmental pollution. Utility Model Content

[0003] The purpose of this invention is to provide a tail gas treatment device for coal coking flue gas pipelines that is simple in structure, stable in operation, and can reduce environmental pollution.

[0004] The purpose of this utility model is achieved as follows: it includes an upper exhaust duct, a lower exhaust duct, and a dust removal duct disposed between the two. An annular plate is provided at the upper part of the lower exhaust duct, and a vertical pipe with its lower end sealed is provided on the annular plate. Several air jets are evenly distributed circumferentially and tangentially arranged on the side wall of the vertical pipe. A sewage pipe is provided at the bottom of the vertical pipe. A vertical shaft is concentrically arranged inside the vertical pipe. Multiple fan blades are evenly distributed circumferentially on the vertical shaft. The upper end of the vertical shaft extends into the dust removal duct and is connected to a central pipe. The upper end of the central pipe is connected to a hollow disc. Multiple horizontal pipes with sealed ends are evenly distributed circumferentially on the hollow disc. Spray nozzles are provided on the central pipe and the horizontal pipes. A water supply pipe is provided on the dust removal duct above the hollow disc. The end of the water supply pipe extends into the dust removal duct and is bent downwards to rotatably connect with the hollow disc. A dehumidifier is provided in the dust removal duct above the water supply pipe.

[0005] Furthermore, the upper exhaust duct and the dust removal duct, as well as the lower exhaust duct and the dust removal duct, are connected by flanges.

[0006] Furthermore, the dust removal duct includes a shell and a reducing cone connected sequentially from top to bottom. The lower end of the reducing cone is connected to the lower exhaust duct, and the diameter of the shell is larger than the diameter of the lower exhaust duct.

[0007] Furthermore, a sedimentation tank and a water storage tank are connected sequentially to the sewage pipe, and the water storage tank is connected to the water supply pipe through a pipeline.

[0008] Furthermore, a ring pipe is installed above the dehumidifier, and water spray holes are installed on the ring pipe facing the dehumidifier.

[0009] Furthermore, the spray volume from the nozzles on the horizontal pipe gradually increases from the inside out.

[0010] Furthermore, a water spray pipe with a sealed bottom is provided at the bottom of the horizontal pipe, and several water spray holes are evenly distributed on the water spray pipe.

[0011] This utility model is installed on a coal coking flue gas duct and is used to purify the exhaust gas in the flue gas duct. During operation, the exhaust gas flows from bottom to top in the lower exhaust gas duct and flows tangentially into the vertical pipe through the jet nozzle. The exhaust gas rotates and flows in the vertical pipe. The swirling flow drives the fan blades and vertical shaft to rotate. The vertical shaft drives the central pipe to rotate. The central pipe drives the hollow disc and horizontal pipe to rotate. The swirling flow in the vertical pipe flows upward. At the same time, clean water is filled into the hollow disc through the water supply pipe. The clean water enters each horizontal pipe and the central pipe and is sprayed out from the nozzles on each horizontal pipe and the central pipe. The water mist comes into uniform and full contact with the exhaust gas. The water mist absorbs the dust particles in the exhaust gas, and the exhaust gas is fully purified. Then the exhaust gas continues to rise and passes through the dehumidifier to remove the moisture and dust mixed in the moisture. The purified exhaust gas is discharged from the upper exhaust gas duct. This invention is installed on a flue gas duct, featuring a simple structure. It utilizes the power of the exhaust gas to drive the fan blades, vertical shaft, central tube, and horizontal tube to rotate, requiring no additional power. Furthermore, the larger the exhaust gas volume, the faster the rotation speed of the fan blades and other components, resulting in higher contact efficiency between the exhaust gas and water mist. This ensures good dust removal and purification effects regardless of the exhaust gas volume, exhibiting good operational stability. Secondly, the nozzles are located on the central and horizontal tubes, which are in a rotating state. The sprayed water mist can be evenly distributed within the dust removal duct, ensuring sufficient contact with the swirling exhaust gas and guaranteeing effective dust removal and purification. Additionally, the exhaust gas first undergoes spray dust removal, using water mist to remove dust particles, and then a dehumidifier removes the moisture containing dust. This process removes moisture while further removing dust and impurities from the exhaust gas, resulting in excellent dust removal and effectively reducing environmental pollution from exhaust gas emissions. In summary, this invention has the advantages of simple structure, stable operation, and reduced environmental pollution. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; In the diagram: 1-Upper exhaust pipe, 2-Lower exhaust pipe, 3-Dust removal pipe, 4-Vertical pipe, 5-Air jet nozzle, 6-Sewage pipe, 7-Vertical shaft, 8-Fan blade, 9-Central pipe, 10-Hollow disc, 11-Horizontal pipe, 12-Water supply pipe, 13-Dehumidifier, 14-Flange, 15-Shell, 16-Reducing cone, 17-Sedimentation tank, 18-Water storage tank, 19-Ring pipe, 20-Spray pipe. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0014] like Figure 1 As shown, this utility model includes an upper exhaust pipe 1, a lower exhaust pipe 2, and a dust removal pipe 3 disposed between them. The upper exhaust pipe 1 and the lower exhaust pipe 2 are existing coal coking exhaust pipes. The dust removal pipe 3 is installed between the upper exhaust pipe 1 and the lower exhaust pipe 2 for dust removal treatment of the exhaust gas in the exhaust pipes. An annular plate is provided in the upper part of the lower exhaust pipe 2, and a vertical pipe 4 with its lower end sealed is provided on the annular plate. Several jet nozzles 5 are evenly distributed circumferentially and tangentially arranged on the side wall of the vertical pipe 4. A sewage pipe 6 is provided at the bottom of the vertical pipe 4. A vertical shaft 7 is concentrically arranged inside the vertical pipe 4. Multiple fan blades 8 are evenly distributed circumferentially on the vertical shaft 7. The upper end of the vertical shaft 7 extends into the dust removal pipe 3 and is connected to a central pipe 9. The upper part of the central pipe 9... The device is connected to a hollow disc 10. Multiple horizontal pipes 11 with sealed ends are evenly distributed around the circumference of the hollow disc 10. Spray nozzles are installed on the central pipe 9 and the horizontal pipes 11. A water supply pipe 12 is installed on the dust removal pipe 3 above the hollow disc 10. The end of the water supply pipe 12 extends into the dust removal pipe 3 and then bends downward to rotatably connect with the hollow disc 10. A dehumidifier 13 is installed in the dust removal pipe 3 above the water supply pipe 12. When this utility model is in operation, it uses water mist to spray and remove dust from the exhaust gas. While achieving the purpose of dust removal, the exhaust gas will also contain a certain amount of moisture, and the moisture will also contain a certain amount of dust and impurities. Therefore, a dehumidifier 13 is installed to remove moisture from the exhaust gas and further remove dust from the exhaust gas.

[0015] This utility model is installed on a coal coking flue gas duct and is used to purify the exhaust gas in the flue gas duct. During operation, the exhaust gas flows from bottom to top in the lower exhaust gas duct 2, and flows tangentially into the vertical pipe 4 through the jet nozzle 5. The exhaust gas rotates and flows in the vertical pipe 4. The swirling flow drives the fan blade 8 and the vertical shaft 7 to rotate. The vertical shaft 7 drives the central pipe 9 to rotate. The central pipe 9 drives the hollow disc 10 and the horizontal pipe 11 to rotate. The swirling flow in the vertical pipe 4 flows upward. At the same time, clean water is filled into the hollow disc 10 through the water supply pipe 12. The clean water enters each horizontal pipe 11 and the central pipe 9, and then water mist is sprayed out from the nozzles on each horizontal pipe 11 and the central pipe 9. The water mist comes into uniform and full contact with the exhaust gas. The water mist absorbs the dust particles in the exhaust gas, and the exhaust gas is fully purified. Then the exhaust gas continues to rise and passes through the dehumidifier 13 to remove the moisture and dust mixed in the moisture. The purified exhaust gas is discharged from the upper exhaust gas duct 1.

[0016] This utility model is installed on the exhaust duct, with a simple structure. It uses the power of the exhaust gas to drive the fan blades 8, vertical shaft 7, central tube 9, and horizontal tube 11 to rotate, without requiring additional power. Moreover, the larger the exhaust gas volume, the faster the rotation speed of the fan blades 8 and other parts, and the higher the contact efficiency between the exhaust gas and water mist. This ensures that good dust removal and purification can be achieved regardless of the exhaust gas volume, and it has good operational stability. Secondly, the nozzles are set on the central tube 9 and horizontal tube 11, which are in a rotating state. The sprayed water mist can be evenly distributed in the dust removal duct 3, thus fully contacting the swirling exhaust gas and ensuring the dust removal and purification effect of the exhaust gas. In addition, the exhaust gas first passes through the spray dust removal, using water mist to remove dust particles from the exhaust gas, and then the dehumidifier 13 removes the moisture containing dust. While removing moisture from the exhaust gas, it further removes dust and impurities from the exhaust gas, resulting in a good dust removal effect and effectively reducing the pollution of the environment caused by exhaust gas emissions.

[0017] To facilitate the installation, maintenance and disassembly of the dust removal duct 3, the upper exhaust duct 1 and the dust removal duct 3, as well as the lower exhaust duct 2 and the dust removal duct 3, are connected by flanges 14.

[0018] The dust removal duct 3 includes a shell 15 and a variable diameter cone 16 connected sequentially from top to bottom. The lower end of the variable diameter cone 16 is connected to the lower exhaust duct 2. The diameter of the shell 15 is larger than the diameter of the lower exhaust duct 2. The exhaust gas flows from bottom to top, passing through the lower exhaust duct 2, the variable diameter cone 16, the shell 15, and the upper exhaust duct 1 in sequence. When the exhaust gas flows into the shell 15 through the variable diameter cone 16, the cross-sectional area increases, the exhaust gas flow area increases, and the exhaust gas flow rate slows down, thereby improving the contact efficiency between the exhaust gas and water mist, prolonging the contact time between the exhaust gas and water mist, and ultimately improving the dust removal effect of the exhaust gas.

[0019] A sedimentation tank 17 and a water storage tank 18 are connected sequentially to the sewage pipe 6. The water storage tank 18 is connected to the water supply pipe 12 via a pipeline. When this utility model is in operation, water mist is sprayed out to remove dust from the exhaust gas. The water mist mixed with dust falls continuously and is finally discharged from the sewage pipe 6. Then it enters the sedimentation tank 17 and the water storage tank 18 in sequence to treat the sewage. The clean water flows into the water storage tank 18 for storage and finally returns to the water supply pipe 12 for repeated recycling, thereby improving the utilization rate of water resources and saving water consumption.

[0020] A ring pipe 19 is provided above the dehumidifier 13, and water spray holes are provided on the ring pipe 19 facing the dehumidifier 13. While the dehumidifier 13 is removing dust and moisture, dust and impurities will continuously accumulate on the dehumidifier 13, causing blockage of the wire mesh dust collector 13. After setting the ring pipe 19 and water spray holes, clean water is introduced into the ring pipe 19 and then sprayed from the water spray holes onto the dehumidifier 13 to rinse the dehumidifier 13, ensuring the smooth flow of the dehumidifier 13, and thus ensuring the cleaning effect of the dehumidifier 13 on moisture and dust.

[0021] The spray volume of the nozzles on the horizontal pipe 11 gradually increases from the inside to the outside. The horizontal pipe 11 is in a rotating state, and water mist is sprayed out from the nozzles on the horizontal pipe 11, dividing the cross-section of the dust removal pipe 3 into an inner central circle and several concentric ring areas. The exhaust gas volume in the central circle area of ​​the dust removal pipe 3 is relatively small, while the exhaust gas volume is larger in the outer ring areas. This results in a smaller demand for water mist sprayed from the nozzles on the inner side of the horizontal pipe 11 and a larger demand for water mist sprayed from the nozzles on the outer side of the horizontal pipe 11. To address this situation, the spray volume of the nozzles on the horizontal pipe 11 gradually increases from the inside to the outside, adapting to the demand for water mist in exhaust gas dust removal, ensuring that the exhaust gas in each part can be fully mixed with the water mist, thereby achieving a better dust removal effect.

[0022] The bottom of the horizontal pipe 11 is provided with a water spray pipe 20 with a lower end sealed. The water spray pipe 20 has several spray holes evenly distributed on it. When this utility model is in operation, water flows from the water supply pipe 12 into the hollow disc 10, then into the horizontal pipe 11, then into the water spray pipe 20, and finally sprays out from the spray holes on the water spray pipe 20, thereby improving the contact efficiency between water mist and exhaust gas and promoting the dust removal effect of exhaust gas.

Claims

1. A tail gas treatment device for a coal coking flue gas pipeline, comprising an upper flue gas pipeline (1), a lower flue gas pipeline (2), and a dust removal pipeline (3) disposed between the two, characterized in that: The upper part of the lower exhaust pipe (2) is provided with a ring plate, and a vertical pipe (4) with its lower end sealed is provided on the ring plate. Several air jets (5) are evenly distributed and tangentially arranged on the side wall of the vertical pipe (4). A sewage pipe (6) is provided at the bottom of the vertical pipe (4). A vertical shaft (7) is concentrically arranged inside the vertical pipe (4). Multiple fan blades (8) are evenly distributed on the circumference of the vertical shaft (7). The upper end of the vertical shaft (7) extends into the dust removal pipe (3) and is connected to a central pipe (9). The upper part of the central pipe (9) is connected to a central pipe (9). A hollow disc (10) is connected to the end. Multiple horizontal pipes (11) with sealed ends are evenly distributed around the circumference of the hollow disc (10). Spray nozzles are installed on the central pipe (9) and the horizontal pipes (11). A water supply pipe (12) is installed on the dust removal pipe (3) above the hollow disc (10). The end of the water supply pipe (12) extends into the dust removal pipe (3) and then bends downward to rotate and connect with the hollow disc (10). A dehumidifier (13) is installed in the dust removal pipe (3) above the water supply pipe (12).

2. The tail gas treatment device for coal coking flue gas pipelines according to claim 1, characterized in that: The upper exhaust pipe (1) and the dust removal pipe (3), and the lower exhaust pipe (2) and the dust removal pipe (3) are connected by flanges (14).

3. The tail gas treatment device for coal coking flue gas pipelines according to claim 1, characterized in that: The dust removal pipe (3) includes a shell (15) and a variable diameter cone (16) connected from top to bottom. The lower end of the variable diameter cone (16) is connected to the lower exhaust pipe (2). The diameter of the shell (15) is larger than the diameter of the lower exhaust pipe (2).

4. The tail gas treatment device for coal coking flue gas pipelines according to claim 1, characterized in that: The sewage pipe (6) is connected in sequence to a sedimentation tank (17) and a water storage tank (18), and the water storage tank (18) is connected to the water supply pipe (12) through a pipeline.

5. The tail gas treatment device for coal coking flue gas pipelines according to claim 1, characterized in that: A ring pipe (19) is provided above the dehumidifier (13), and a water spray hole is provided on the ring pipe (19) facing the dehumidifier (13).

6. The tail gas treatment device for coal coking flue gas pipelines according to claim 1, characterized in that: The spray volume of the nozzle on the horizontal tube (11) gradually increases from the inside to the outside.

7. The tail gas treatment device for coal coking flue gas pipelines according to claim 1, characterized in that: The bottom of the horizontal pipe (11) is provided with a water spray pipe (20) with the lower end sealed, and the water spray pipe (20) is evenly distributed with several water spray holes.

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