Spraying dust removal system for coke oven gas

Abstract

The invention discloses a spraying dust removal system for coke oven gas. Comprising a spray tower with a hollow middle part, a middle rotating shaft which is vertically arranged and rotatably arranged in the spray tower, a driving motor connected with the upper end of the middle rotating shaft, and a dust filter screen which is arranged in the spray tower and is penetrated by the middle rotating shaft, the washing mechanism is sleeved on the middle rotating shaft and is used for cleaning the dust filter screen; and the spraying mechanism is sleeved on the middle rotating shaft and is positioned below the dust filter screen. A gas inlet pipe is arranged at the lower end of the side wall of the spray tower, a gas outlet pipe is arranged at the upper end of the side wall of the spray tower, and a blow-off pipe is arranged at the bottom of the spray tower. According to the coke oven gas purification device, the coke oven gas can be purified by arranging the spraying structure, the coke oven gas moving from bottom to top can be further filtered by arranging the dust filter screen, and the dust filter screen can be effectively cleaned and prevented from being blocked by the brushing mechanism, so that the long-term effective coke oven gas purification effect is achieved.

Description

Technical Field

[0001] This invention relates to the technical field of coke oven gas purification equipment, and in particular to a spray dust removal system for coke oven gas. Background Technology

[0002] Coke oven gas is a byproduct of the coking industry. It has a complex composition, containing large amounts of dust, tar, and other impurities. Effective purification is essential before subsequent transportation, storage, and use. Wet dust removal is one common purification method, typically using a spray tower where water mist comes into counter-current contact with the coke oven gas, using water droplets to capture dust particles.

[0003] Existing dust removal technologies using spray towers suffer from limitations such as limited dust capture efficiency, easy clogging of dust filters, and difficulty in cleaning the filters. Traditional dust filter cleaning methods typically involve manual disassembly and cleaning after the machine is shut down, or the use of fixed flushing devices. The former is labor-intensive and affects production continuity, while the latter leaves cleaning blind spots and results in unsatisfactory cleaning effects, failing to achieve online, continuous, and automated cleaning functions.

[0004] In view of this, it is necessary to provide a coke oven gas purification device that can improve the dust capture rate and achieve self-cleaning dust filter. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies, such as limited dust capture efficiency, easy clogging of dust filters, and difficulty in cleaning dust filters. It provides a spray dust removal system for coke oven gas, which, through a spray structure, purifies the coke oven gas. Furthermore, the dust filter further filters the coke oven gas moving upwards, and the washing mechanism effectively cleans the dust filter, preventing clogging and achieving long-term effective coke oven gas purification.

[0006] The present invention provides a spray dust removal system for coke oven gas, including a spray tower with a hollow center, a vertically arranged and rotatably mounted central shaft in the spray tower, a drive motor connected to the upper end of the central shaft, a dust filter screen disposed inside the spray tower and passed through by the central shaft, a washing mechanism sleeved on the central shaft for cleaning the dust filter screen, and a spraying mechanism sleeved on the central shaft and located below the dust filter screen. The spray tower has an air inlet pipe at the lower end of its side wall, an air outlet pipe at the upper end of its side wall, and a sewage discharge pipe at the bottom.

[0007] In one of the alternative technical solutions, the transfer shaft is a hollow shaft, and the inner cavity of the transfer shaft is provided with a partition plate, which divides the inner cavity of the transfer shaft into an upper shaft for supplying fluid to the washing mechanism and a lower shaft for supplying fluid to the spraying mechanism.

[0008] In one of the alternative technical solutions, an upper transfer water tank for supplying water to the washing mechanism is connected to the upper shaft, and a lower transfer water tank for supplying water to the spraying mechanism is connected to the lower shaft.

[0009] In one of the alternative technical solutions, the washing mechanism includes an upper transfer water tank disposed on the transfer shaft, a first water inlet pipe connected to the upper transfer water tank, a strip brush sleeved on the transfer shaft and in contact with the lower end face of the dust filter, a plurality of first water distribution pipes extending outward from the transfer shaft above the dust filter, and a plurality of nozzles disposed on the first water distribution pipes, wherein the first water distribution pipes are connected to the upper transfer water tank through the upper shaft.

[0010] In one of the alternative technical solutions, the bristles of the strip brush are made of nylon, the dust filter is made of stainless steel, and the mesh density of the dust filter is 50-200 mesh.

[0011] In one of the alternative technical solutions, the spraying mechanism includes a lower transfer water tank disposed on the transfer shaft, a second water inlet pipe connected to the lower transfer water tank, a plurality of second water distribution pipes extending outward from the transfer shaft, and a plurality of atomizing nozzles disposed on the second water distribution pipes.

[0012] In one of the alternative technical solutions, the middle portions of the upper transfer water tank and the lower transfer water tank are respectively provided with clearance perforations, and the transfer shaft passes through the upper transfer water tank and the lower transfer water tank respectively.

[0013] In one of the alternative technical solutions, the sides of the upper transfer water tank and the lower transfer water tank are respectively fixedly connected to the inner wall of the spray tower by support rods.

[0014] In one of the alternative technical solutions, a control module is also included. A humidity sensor that is communicatively connected to the control module is provided on the air outlet pipe, and water inlet pipes of the washing mechanism and the spraying mechanism are respectively provided with water inlet valves that are electrically connected to the control module.

[0015] In one of the alternative technical solutions, the spray tower further includes an annular air distribution pipe connected to the air inlet pipe. The annular air distribution pipe is located below the spray mechanism, and the lower side of the annular air distribution pipe is provided with multiple air outlets.

[0016] The above technical solution has the following beneficial effects: The coke oven gas spray dust removal system provided by this invention purifies coke oven gas through a spray structure, and further filters the gas as it moves upwards using a dust filter. A washing mechanism effectively cleans the dust filter, preventing clogging and achieving long-term effective coke oven gas purification. This invention's washing mechanism enables automatic cleaning of the dust filter, avoiding the labor-intensive manual cleaning while significantly improving the cleaning effect. Attached Figure Description

[0017] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings: Figure 1 A first perspective view of a spray dust removal system for coke oven gas provided in an embodiment of the present invention; Figure 2 A second perspective view of a spray dust removal system for coke oven gas provided in an embodiment of the present invention; Figure 3 This is a first cross-sectional schematic diagram of a spray dust removal system for coke oven gas provided in an embodiment of the present invention; Figure 4 This is a second cross-sectional schematic diagram of a spray dust removal system for coke oven gas provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of a spray dust removal system for coke oven gas provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the connection of the upper and middle transfer water tanks according to an embodiment of the present invention.

[0018] Figure reference numerals: 1. Spray tower; 2. Air outlet pipe; 3. Air inlet pipe; 4. Sewage discharge pipe; 5. Dust filter; 6. Annular air distribution pipe; 7. Motor; 8. Central transfer shaft; 9. First water inlet pipe; 10. Upper central transfer water tank; 11. First water distribution pipe; 12. Nozzle; 13. Strip brush; 14. First water inlet hole; 15. Second water inlet pipe; 16. Lower central transfer water tank; 17. Second water distribution pipe; 18. Atomizing nozzle; 19. Second water inlet hole; 20. Support rod. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0020] In this invention, unless otherwise explicitly specified and limited, the term "fixed" and similar terms should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In existing technologies, single-stage spray dust collection has limited efficiency in capturing fine dust, resulting in incomplete purification. Furthermore, to improve the effectiveness of spray dust collection, some equipment installs dust filters inside the tower to intercept particulate matter. However, these filters are easily clogged by dust during operation, leading to increased system resistance, reduced airflow, and increased energy consumption. Moreover, traditional dust filter cleaning methods often involve manual disassembly and cleaning after system shutdown or the use of fixed flushing devices. The former is labor-intensive and disrupts production continuity, while the latter leaves cleaning blind spots and results in unsatisfactory cleaning effects, failing to achieve online, continuous, and automated cleaning.

[0022] like Figure 1-6 As shown, an embodiment of the present invention provides a spray dust removal system for coke oven gas, comprising a spray tower 1 with a hollowed-out center, a vertically arranged and rotatably mounted central shaft 8 within the spray tower 1, a drive motor 7 connected to the upper end of the central shaft 8, a dust filter 5 disposed inside the spray tower 1 and passed through by the central shaft 8, a washing mechanism sleeved on the central shaft 8 for cleaning the dust filter 5, and a spraying mechanism sleeved on the central shaft 8 and located below the dust filter 5. An air inlet pipe 3 is provided at the upper end of the side wall of the spray tower 1, an air outlet pipe 2 is provided at the lower end of the side wall of the spray tower 1, and a drain pipe 4 is provided at the bottom of the spray tower 1.

[0023] The spray tower 1 is the core structure of the system. It is a closed cylindrical structure with an internal hollow core. Inside the spray tower 1, from top to bottom, are a drive motor 7, a dust filter 5, a washing mechanism, and a spraying mechanism, all connected by a vertical central shaft 8. The central shaft 8 can rotate relative to the spray tower 1 under the drive of the drive motor 7. The drive motor 7 is installed on the upper exterior of the tower body and is connected to the upper end of the central shaft 8 to drive its rotation. The coke oven gas to be purified enters through the inlet pipe 3 at the upper end of the tower body's side wall, flows downwards, and undergoes purification processes such as spraying and filtration. The clean coke oven gas is then discharged through the outlet pipe 2 at the lower end of the tower body's side wall. Wastewater and sediment generated during washing are periodically discharged from the drain pipe 4 at the bottom of the tower.

[0024] This invention addresses the shortcomings of existing spray tower technology, such as insufficient efficiency in capturing fine dust even with the addition of a dust filter 5, the easy clogging of the dust filter 5 by sticky dust such as tar dust leading to a sharp increase in system resistance, and the need for manual operation or the existence of cleaning dead zones in traditional cleaning methods. This invention provides an integrated, online, automatic cleaning solution. In the spray dust removal system provided by this invention, the coke oven gas to be purified enters the tower tangentially or radially from the inlet pipe 3 at the lower end of the tower's side wall, with the airflow moving upwards to the outlet pipe 2 located at the upper end of the side wall of the spray tower 1. The coke oven gas first passes through a dense water mist zone formed by the spray mechanism located below the spray tower 1, where dust particles are pre-wetted, weighted, and agglomerated, and then discharged from the drain pipe 4 at the bottom of the spray tower 1 under gravity. Subsequently, the coke oven gas continues to pass upwards through the dust filter 5, which finely filters and intercepts the dust in the coke oven gas. During this process, the drive motor 7 rotates the central shaft 8 and the washing mechanism mounted on it, achieving mechanical scraping of the lower surface of the dust filter screen 5. Simultaneously, cleaning fluid is delivered to the washing mechanism through an independent channel within the central shaft 8, spraying it from above the dust filter screen 5 to rinse it. This, combined with the strip brush 13 of the washing mechanism, achieves composite cleaning, effectively preventing the dust filter screen 5 from becoming clogged by dust. The clean coke oven gas is finally discharged from the outlet pipe 2 at the upper end of the tower side wall, while the washed-down contaminants settle with the water flow and are periodically discharged from the drain pipe 4 at the bottom of the tower.

[0025] In summary, the coke oven gas spray dust removal system provided in this embodiment of the invention purifies the coke oven gas by setting up a spray structure. Furthermore, the dust filter 5 further filters the coke oven gas moving upwards. The washing mechanism effectively cleans the dust filter 5, preventing clogging and achieving a long-term effective coke oven gas purification effect. This invention, by setting up a washing mechanism, enables automatic cleaning of the dust filter 5, avoiding the high-intensity labor of manual cleaning while significantly improving the cleaning effect.

[0026] In one embodiment, the transfer shaft 8 is a hollow shaft, and the inner cavity of the transfer shaft 8 is provided with a partition plate, which divides the inner cavity of the transfer shaft 8 into an upper shaft body for supplying fluid to the washing mechanism and a lower shaft body for supplying fluid to the spraying mechanism.

[0027] In this embodiment, the transfer shaft 8 is designed as a hollow structure, with a fixed partition plate inside that strictly divides the shaft's interior into two independent parts. The upper shaft is specifically used to transport the water or cleaning fluid required for cleaning the dust filter 5, while the lower shaft is specifically used to transport the atomized water required for spray dust removal. By setting the transfer shaft 8 as an upper and lower separated structure, it is ensured that the two fluids are completely independent during transport and do not interfere with each other.

[0028] In one embodiment, an upper transfer water tank 10 for supplying water to the washing mechanism is connected to the upper shaft, and a lower transfer water tank 16 for supplying water to the spraying mechanism is connected to the lower shaft.

[0029] In this embodiment, to introduce external water into the rotating transfer shaft 8, the system is equipped with two fixed transfer water tanks. The upper transfer water tank 10 is connected to the upper shaft and is responsible for supplying water to the washing mechanism. The lower transfer water tank 16 is connected to the lower shaft and is responsible for supplying water to the spraying mechanism. Both transfer water tanks are fixed relative to the spray tower 1, while the internal transfer shaft 8 can rotate relative to the transfer water tanks after passing through the clearance hole. A first water inlet 14 is opened on the side wall of the upper transfer water tank 10 at the corresponding position, and a second water inlet 19 is opened on the side wall of the lower transfer water tank 16 at the corresponding position, to achieve continuous fluid introduction.

[0030] In one embodiment, the washing mechanism includes an upper transfer water tank 10 disposed on a transfer shaft 8, a first water inlet pipe 9 connected to the upper transfer water tank 10, a strip brush 13 sleeved on the transfer shaft 8 and in contact with the lower end face of the dust filter 5, a plurality of first water distribution pipes 11 extending outward from the transfer shaft 8 above the dust filter 5, and a plurality of nozzles 12 disposed on the first water distribution pipes 11. The first water distribution pipes 11 are connected to the upper transfer water tank 10 through the upper shaft body.

[0031] In this embodiment, the washing mechanism is the key mechanism for achieving automatic cleaning of the dust filter 5. External cleaning water is pumped into the fixed upper transfer water tank 10 through the first water inlet pipe 9, and then enters the upper shaft body cavity through the water inlet hole on the transfer shaft 8. As the drive motor 7 drives the transfer shaft 8 to rotate, the water flow is distributed to each nozzle 12 through multiple first water distribution pipes 11 that rotate synchronously with the transfer shaft 8, forming a uniform rotating spray of water to rinse the upper surface of the dust filter 5. Cleaning fluid can be added to improve the rinsing effect. Simultaneously, a strip brush 13 fixed to the transfer shaft 8 is in close contact with the lower surface of the dust filter 5 and rotates relative to the dust filter 5, mechanically scraping the lower surface of the dust filter 5. This embodiment, by combining rinsing and scraping, can effectively remove dust accumulated on the surface and in the mesh of the dust filter 5.

[0032] In one embodiment, the bristles of the strip brush 13 are made of nylon, and the dust filter 5 is made of stainless steel with a mesh density of 50-200 mesh.

[0033] In this embodiment, the bristles of the strip brush 13 are made of wear-resistant and flexible nylon material, which can effectively remove dirt while reducing wear on the surface of the stainless steel dust filter screen 5. The dust filter screen 5 is made of corrosion-resistant stainless steel, and the filtration accuracy is set by the mesh density. It can be designed between 50 mesh and 200 mesh according to the particle size range of dust particles in coke oven gas to achieve effective interception of fine dust.

[0034] In one embodiment, the spraying mechanism includes a lower transfer water tank 16 disposed on the transfer shaft 8, a second water inlet pipe 15 connected to the lower transfer water tank 16, a plurality of second water distribution pipes 17 extending outward from the transfer shaft 8, and a plurality of atomizing nozzles 18 disposed on the second water distribution pipes 17.

[0035] In this embodiment, the spraying mechanism is located below the dust filter 5, and its main function is to pre-wet and perform primary dust removal on the rising coke oven gas. External water supply enters the fixed lower transfer water tank 16 through the second water inlet pipe 15, and then enters the lower shaft body cavity through the water inlet hole at the bottom of the transfer shaft 8. When the transfer shaft 8 rotates, the water flow is delivered to multiple second water distribution pipes 17 connected to it. The second water distribution pipes 17 rotate with the transfer shaft 8, and are sprayed out through multiple atomizing nozzles 18 installed on the second water distribution pipes 17, forming a uniform and fine rotating water mist zone in the tower. The water mist fully contacts the coke oven gas to improve the cleaning effect of the coke oven gas.

[0036] In one embodiment, the middle portions of the upper transfer water tank 10 and the lower transfer water tank 16 are respectively provided with clearance perforations, and the transfer shaft 8 passes through the upper transfer water tank 10 and the lower transfer water tank 16 respectively.

[0037] In this embodiment, circular clearance holes are machined at the center of both the upper transfer tank 10 and the lower transfer tank 16. The transfer shaft 8 passes through these two holes in sequence, maintaining an appropriate gap with the inner wall of the holes, thereby enabling the transfer shaft 8 to rotate freely relative to the two fixed transfer tanks. The water inlet is located in the section where the shaft wall overlaps with the inner cavity of the transfer tank, ensuring that fluid can flow smoothly from the stationary transfer tank into the rotating shaft cavity.

[0038] In one embodiment, the sides of the upper transfer tank 10 and the lower transfer tank 16 are respectively fixedly connected to the inner wall of the spray tower 1 by support rods 20.

[0039] In this embodiment, to ensure the stability of the upper and lower transfer tanks 10 and 16 within the tower, several radially extending support rods 20 are welded or bolted to the cylindrical inner wall of the spray tower 1 on the side of the tanks. This support method using the support rods 20 is simple and reliable, preventing displacement of the transfer tanks due to water flow impact or vibration, and ensuring the stability of the water inlet channel.

[0040] In one embodiment, a control module is also included. A humidity sensor that is communicatively connected to the control module is provided on the air outlet pipe 2, and water inlet valves that are electrically connected to the control module are respectively provided on the water inlet pipes of the washing mechanism and the spraying mechanism.

[0041] In this embodiment, a control module is used to achieve intelligent operation. A humidity sensor installed at the end of the exhaust pipe 2 is used to monitor the humidity of the discharged coke oven gas in real time and transmit the signal to the control module. According to a preset program or received operating parameters, the control module can automatically control the opening and closing of the water inlet valves installed on the first water inlet pipe 9 and the second water inlet pipe 15, thereby controlling the start and stop of the washing and spraying operations. The drive motor 7 can also be electrically connected to the control module to automatically start and stop according to a set cycle or dust concentration, achieving unattended and energy-saving operation.

[0042] In one embodiment, the spray tower 1 also includes an annular air distribution pipe 6 connected to the air inlet pipe 3. The annular air distribution pipe 6 is located below the spraying mechanism, and the lower side of the annular air distribution pipe 6 is provided with multiple air outlets.

[0043] In this embodiment, a horizontally placed annular gas distribution pipe 6 is connected to the end of the inlet pipe 3 located inside the spray tower 1. The annular gas distribution pipe 6 is located below the atomization zone formed by the spray mechanism. After the coke oven gas enters the annular gas distribution pipe 6 from the inlet pipe 3, it is sprayed downwards from multiple evenly spaced gas outlets on its lower side. By setting the annular gas distribution pipe 6, the coke oven gas can achieve a more uniform initial distribution across the cross-section of the tower body, avoiding airflow short-circuiting or deflection, thereby improving the overall effect of subsequent spraying and filtration.

[0044] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0045] The above are merely the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. A spray dedusting system of coke oven gas, characterized in that, The spray tower (1) comprises a middle hollow part, a vertical middle rotating shaft (8) arranged in the spray tower (1) and rotatable, a driving motor (7) connected with the upper end of the middle rotating shaft (8), a dust filter screen (5) arranged inside the spray tower (1) and penetrated by the middle rotating shaft (8), a washing mechanism sleeved on the middle rotating shaft (8) for cleaning the dust filter screen (5), and a spraying mechanism sleeved on the middle rotating shaft (8) and located below the dust filter screen (5). The lower end of the side wall of the spray tower (1) is provided with an air inlet pipe (3), the upper end of the side wall of the spray tower (1) is provided with an air outlet pipe (2), and the bottom of the spray tower (1) is provided with a blowdown pipe (4).

2. The system for spray dedusting of coke oven gas according to claim 1, characterized in that, The middle rotating shaft (8) is a hollow shaft, and the inner cavity of the middle rotating shaft (8) is provided with a partition plate, which divides the inner cavity of the middle rotating shaft (8) into an upper shaft body for supplying fluid to the washing mechanism and a lower shaft body for supplying fluid to the spraying mechanism.

3. The system for the spray dedusting of the coke oven gas according to claim 2, characterized in that, The upper shaft body is connected with an upper middle rotating water tank (10) for supplying fluid to the washing mechanism, and the lower shaft body is connected with a lower middle rotating water tank (16) for supplying fluid to the spraying mechanism.

4. The system for spray dedusting of coke oven gas according to claim 3, characterized in that, The washing mechanism comprises an upper middle rotating water tank (10) arranged on the middle rotating shaft (8), a first water inlet pipe (9) connected with the upper middle rotating water tank (10), a strip-shaped brush (13) sleeved on the middle rotating shaft (8) and in contact with the lower end surface of the dust filter screen (5), a plurality of first water distribution pipes (11) extending outward from the middle rotating shaft (8) and located above the dust filter screen (5), and a plurality of nozzles (12) arranged on the first water distribution pipes (11), wherein the first water distribution pipes (11) are in communication with the upper middle rotating water tank (10) through the upper shaft body.

5. The system for the spray dedusting of the coke oven gas according to claim 4, characterized in that, The bristles of the strip-shaped brush (13) are nylon bristles, the dust filter screen (5) is made of stainless steel, and the mesh density of the dust filter screen (5) is 50-200 meshes.

6. The system for spray dedusting of coke oven gas according to claim 3, characterized in that, The spraying mechanism comprises a lower middle rotating water tank (16) arranged on the middle rotating shaft (8), a second water inlet pipe (15) connected with the lower middle rotating water tank (16), a plurality of second water distribution pipes (17) extending outward from the middle rotating shaft (8), and a plurality of atomizing nozzles (18) arranged on the second water distribution pipes (17).

7. The system for the spray dedusting of the coke oven gas according to claim 3, characterized in that, The middle parts of the upper middle rotating water tank (10) and the lower middle rotating water tank (16) are respectively provided with avoiding perforations, and the middle rotating shaft (8) penetrates the upper middle rotating water tank (10) and the upper middle rotating water tank (10) respectively.

8. The system for the spray dedusting of the coke oven gas according to claim 7, characterized in that, The side surfaces of the upper middle rotating water tank (10) and the lower middle rotating water tank (16) are respectively fixedly connected to the inner wall of the spray tower (1) through supporting rods (20).

9. The system for the spray dedusting of the coke oven gas according to claim 1, characterized in that, A control module is further included, a humidity sensor in communication connection with the control module is arranged on the air outlet pipe (2), and the water inlet pipes of the washing mechanism and the spraying mechanism are respectively provided with water inlet valves in electrical connection with the control module.

10. The system for spray dedusting of coke oven gas according to claim 1, characterized in that, The spray tower (1) further comprises an annular air distribution pipe (6) connected with the air inlet pipe (3), the annular air distribution pipe (6) is located below the spraying mechanism, and the lower side of the annular air distribution pipe (6) is provided with a plurality of air outlet holes.

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