A steelmaking ultra-high temperature flue gas purification device

Abstract

This utility model discloses an ultra-high temperature flue gas purification device for steelmaking, including a shell and an inlet pipe. The interior of the shell is divided into a spiral dust collection chamber and a fine filtration chamber by a partition. The inlet pipe is tangentially connected to the spiral dust collection chamber. Multiple vertical cylinders are concentrically arranged in the fine filtration chamber. The upper end of each vertical cylinder is sealed to the top of the shell, and the lower end is sealed to the partition. Several horizontal pipes are evenly distributed on the side wall of each vertical cylinder, and honeycomb ceramics are installed inside the horizontal pipes. An exhaust pipe is provided on the side wall of the fine filtration chamber. An upper air pipe is provided on the vertical center line of the fine filtration chamber, and the lower end of the upper air pipe passes through the partition and connects to the spiral dust collection chamber. Ring pipes are provided at the bottom of the annular space between two adjacent vertical cylinders and at the bottom of the innermost vertical cylinder. A dust suction port is provided at the bottom of the ring pipe, and a dust suction pipe extending out of the fine filtration chamber is provided on the ring pipe. In summary, this utility model has the advantages of low processing cost, high working efficiency, and good dust removal effect.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas purification equipment, specifically to a steelmaking ultra-high temperature flue gas purification device. Background Technology

[0002] According to the classification standards of thermal power engineering, in the flue gas filtration industry, the flue gas to be filtered can be divided into normal temperature flue gas, normal high temperature flue gas, sub-high temperature flue gas, and ultra-high temperature flue gas. Normal temperature flue gas refers to flue gas with a temperature below 120℃, normal high temperature flue gas refers to flue gas with a temperature below 250℃, sub-high temperature flue gas refers to flue gas with a temperature between 250℃ and 450℃, and ultra-high temperature flue gas refers to flue gas with a temperature below 800℃. Steelmaking refers to controlling the carbon content to less than 2%, eliminating harmful elements such as P, S, O, and N, retaining or increasing beneficial elements such as Si, Mn, Ni, and Cr, and adjusting the proportions between these elements to obtain steel with optimal performance. During the steelmaking process, a large amount of ultra-high temperature flue gas is generated, characterized by small dust particles and high temperature. If effective control measures are not taken, it will seriously pollute the workshop and factory environment, affecting the health of workers and surrounding residents.

[0003] Currently, the purification of ultra-high temperature flue gas from steelmaking faces several challenges: First, most methods rely on water to cool and purify the flue gas, consuming significant amounts of water and resulting in high costs. Furthermore, water evaporation creates new steam-like flue gas, increasing the overall volume of flue gas requiring treatment and reducing efficiency. Second, the high temperatures render many dust collectors unsuitable, with most relying on cyclone dust collectors, which are ineffective at handling fine dust particles. Given the relatively small particle size of the flue gas produced during steelmaking, dust removal is inefficient. Therefore, developing a cost-effective, efficient, and effective ultra-high temperature flue gas purification device for steelmaking is essential. Utility Model Content

[0004] The purpose of this invention is to provide a steelmaking ultra-high temperature flue gas purification device with low processing cost, high working efficiency, and good dust removal effect.

[0005] The purpose of this utility model is achieved as follows: It includes a housing and a smoke inlet pipe. The interior of the housing is divided into a spiral dust collection chamber and a fine filtration chamber from bottom to top by a partition. The smoke inlet pipe is tangentially connected to the upper part of the spiral dust collection chamber. Multiple vertical cylinders are concentrically arranged from the outside to the inside of the fine filtration chamber. The upper end of each vertical cylinder is sealed to the top of the housing, and the lower end is sealed to the partition. Several horizontal pipes are evenly distributed on the side wall of each vertical cylinder, and honeycomb ceramics are installed inside the horizontal pipes. A smoke exhaust pipe is provided on the side wall of the fine filtration chamber. An upper air pipe is provided on the vertical center line of the fine filtration chamber. The lower end of the upper air pipe passes through the partition and connects to the spiral dust collection chamber. Ring pipes are provided at the bottom of the annular space between two adjacent vertical cylinders and at the bottom of the innermost vertical cylinder. A dust suction port is provided at the bottom of the ring pipe, and a dust suction pipe extending out of the fine filtration chamber is provided on the ring pipe.

[0006] Furthermore, a blocking plate is installed at the upper end of the upper air tube after it extends into the upper part of the fine filter chamber, and several air outlet holes are evenly distributed on the tube wall of the upper air tube.

[0007] Furthermore, a dust collection box is connected to the lower end of the spiral dust collection chamber, and a dust pump is installed on the suction pipe, with the end of the suction pipe connected to the dust collection box.

[0008] Furthermore, the upper part of the dust collection box is equipped with a dustproof plate with a convex center and a concave edge.

[0009] Furthermore, the horizontal tubes installed on adjacent vertical tubes are staggered.

[0010] Furthermore, a vertical pipe with both ends sealed is provided in the annular space between the shell and the outermost vertical cylinder. Several air inlets are evenly distributed along the vertical direction on the inner side of the vertical pipe, and an air inlet pipe is connected to the outer side of the vertical pipe.

[0011] In operation, the ultra-high temperature flue gas from steelmaking enters the spiral dust collector tangentially from the inlet pipe. Within the spiral dust collector, it flows spirally, and centrifugal force separates large particles of dust and impurities. The gas then flows upwards through the upper air pipe on the baffle into the fine filtration chamber. First, it enters the innermost vertical cylinder, filling its internal space. Then, under pressure, the ultra-high temperature flue gas enters the horizontal pipe of this vertical cylinder. After passing through the honeycomb ceramic filter within the horizontal pipe, it enters the adjacent outer vertical cylinder, filling this annular space, and then undergoes another round of honeycomb ceramic filtration. Similarly, the ultra-high temperature flue gas passes through multiple vertical cylinders and undergoes multiple filtrations by honeycomb ceramics to gradually remove tiny particles of dust and impurities, thus purifying the ultra-high temperature flue gas. The purified ultra-high temperature flue gas is then discharged from the exhaust pipe for further processing and utilization, such as waste heat recovery. During the above process, the dust collected by the spiral dust collector falls and is discharged, while the dust filtered out in the fine filter chamber continuously falls onto the baffle. The suction pipe is connected to the corresponding suction device, and the dust on the baffle can be discharged sequentially through the ring pipe and the suction pipe under the action of negative pressure suction. In this invention, the dust removal of ultra-high temperature flue gas does not utilize water resources, thus eliminating water consumption and waste. It also avoids the generation of new pollutants such as sludge, preventing the need for secondary pollutant treatment, reducing flue gas purification costs, and preventing the generation of steam-like flue gas, thereby preventing an increase in the total amount of flue gas and improving the treatment efficiency of ultra-high temperature flue gas. Secondly, this invention uses a spiral centrifugal method for coarse dust removal of the flue gas, and then, based on the relatively small size of the dust particles in steelmaking ultra-high temperature flue gas, employs multi-stage fine filtration using honeycomb ceramics to selectively and gradually remove tiny dust particles, resulting in a superior dust removal effect for steelmaking ultra-high temperature flue gas. Furthermore, the filtered dust is automatically cleaned using a ring pipe and suction pipe, eliminating the need for manual cleaning and enabling online cleaning without downtime, thus ensuring efficient operation of the device. In summary, this invention has the advantages of low processing cost, high efficiency, and excellent dust removal effect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] In the diagram: 1-shell, 2-smoke inlet pipe, 3-partition plate, 4-spiral dust collector chamber, 5-fine filter chamber, 6-vertical cylinder, 7-honeycomb ceramic, 8-air inlet pipe, 9-ring pipe, 10-sucking pipe, 11-dust collection box, 12-dustproof plate, 13-vertical pipe, 14-air inlet pipe. Detailed Implementation

[0014] 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.

[0015] like Figure 1 As shown, this utility model includes a shell 1 and a smoke inlet pipe 2. The interior of the shell 1 is divided into a spiral dust removal chamber 4 and a fine filter chamber 5 from bottom to top by a partition 3. The smoke inlet pipe 2 is tangentially connected to the upper part of the spiral dust removal chamber 4. Multiple vertical cylinders 6 are concentrically arranged from the outside to the inside of the fine filter chamber 5. The upper end of the vertical cylinder 6 is sealed to the top of the shell 1, and the lower end of the vertical cylinder 6 is sealed to the partition 3. Several horizontal pipes are evenly distributed on the side wall of each vertical cylinder 6. Honeycomb ceramics 7 are installed in the horizontal pipes. A smoke exhaust pipe is provided on the side wall of the fine filter chamber 5. An upper air pipe 8 is provided on the vertical center line of the fine filter chamber 5. The lower end of the upper air pipe 8 passes through the partition 3 and is connected to the spiral dust removal chamber 4. A ring pipe 9 is provided at the bottom of the annular space between two adjacent vertical cylinders 6 and at the bottom of the innermost vertical cylinder 6. A dust suction port is provided at the bottom of the ring pipe 9, and a dust suction pipe 10 extending out of the fine filter chamber 5 is provided on the ring pipe 9.

[0016] Honeycomb ceramic 7 possesses high strength and excellent thermal stability. Materials such as cordierite, mullite, and aluminum titanate exhibit superior thermal and chemical stability, enabling it to withstand repeated impacts from high temperatures and pressures. It boasts high filtration accuracy, achieving ultra-low and near-zero emissions, making it suitable for various high-temperature flue gas conditions. The porosity and pore size of honeycomb ceramic 7 are adjustable, allowing for customization to meet diverse high-temperature flue gas purification requirements. Furthermore, honeycomb ceramic 7 features a large specific surface area (≥300㎡ / m³), enabling ultra-low pressure filtration and reducing operating costs. When particulate matter accumulates to a certain level and the pressure loss of the dust removal equipment reaches a set value, a backflushing gas at a certain pressure can clean the honeycomb ceramic 7, completing one dust removal cycle.

[0017] In operation, the ultra-high temperature flue gas from steelmaking enters the spiral dust collector 4 tangentially from the inlet pipe 2. Within the spiral dust collector 4, the gas flows spirally, and centrifugal force separates large particles of dust and impurities from the ultra-high temperature flue gas. Then, it flows upwards into the fine filter chamber 5 through the upper air pipe 8 on the partition 3. It first enters the innermost vertical cylinder 6, filling its internal space. Under pressure, the ultra-high temperature flue gas enters the horizontal pipe of the vertical cylinder 6, where it is filtered by the honeycomb ceramic 7. It then enters the adjacent outer vertical cylinder 6, filling its annular space, and is filtered again by the honeycomb ceramic 7. This process continues, with the ultra-high temperature flue gas passing through multiple vertical cylinders 6 and undergoing multiple filtrations by the honeycomb ceramic 7, gradually removing tiny particles of dust and impurities, thus purifying the ultra-high temperature flue gas. The purified ultra-high temperature flue gas is then discharged from the exhaust pipe for further processing and utilization, such as waste heat recovery. During the above process, the dust collected by the spiral dust collector falls and is discharged, while the dust filtered out in the fine filter chamber 5 continuously falls onto the partition 3. The suction pipe 10 is connected to the corresponding suction device, and the dust on the partition 3 can be discharged sequentially through the ring pipe 9 and the suction pipe 10 under the action of negative pressure suction.

[0018] In this invention, the dust removal of ultra-high temperature flue gas does not utilize water resources, thus eliminating water consumption and waste. It also avoids the generation of new pollutants such as sludge, preventing the need for secondary pollutant treatment, reducing flue gas purification costs, and preventing the generation of steam-like flue gas, thereby preventing an increase in the total amount of flue gas and improving the treatment efficiency of ultra-high temperature flue gas. Secondly, this invention uses a spiral centrifugal method for coarse dust removal of the flue gas, and then, based on the characteristic that the dust particles in the ultra-high temperature flue gas from steelmaking are generally small, it uses honeycomb ceramic 7 for multi-stage fine filtration, selectively and gradually filtering out tiny dust particles in the flue gas, resulting in a better dust removal effect for ultra-high temperature flue gas from steelmaking. Furthermore, the dust filtered by this invention is automatically cleaned by the ring pipe 9 and the suction pipe 10, avoiding manual cleaning and enabling online cleaning without shutdown, thus ensuring the efficient operation of the device.

[0019] The upper end of the upper air pipe 8 extends into the upper part of the fine filter chamber 5 and is fitted with a blocking plate. Several air outlet holes are evenly distributed on the pipe wall of the upper air pipe 8. During operation, the flue gas first enters the upper air pipe 8 and then is ejected from the air outlet holes, which allows the airflow to be evenly injected into the vertical cylinder 6, which is beneficial for the honeycomb ceramic 7 to filter flue gas dust.

[0020] To facilitate dust collection, a dust collection box 11 is connected to the lower end of the spiral dust collector 4. A dust pump is installed on the suction pipe 10, and the end of the suction pipe 10 is connected to the dust collection box 11. The dust collection box 11 collects the dust generated by this device. The dust comes from two sources: one part is the dust generated in the spiral dust collector 4, which falls directly into the dust collection box 11; the other part is the dust separated from the honeycomb ceramic 7, which falls onto the partition plate 3 and, under the suction of the suction pump, passes through the ring pipe 9 and the suction pipe 10 in sequence, and finally also gathers in the dust collection box 11.

[0021] The upper part of the dust collection box 11 is provided with a dustproof plate 12 with a convex upper part and a concave lower edge. While not affecting the dust falling into the dust collection box 11, the dustproof plate 12 has two functions. First, in this utility model, after the flue gas enters the spiral dust removal chamber 4, it will first flow downward spirally. The centrifugal force is used to remove large particles of dust and impurities in the flue gas. The dust and impurities continuously fall into the dust collection box 11 and accumulate. The dustproof plate 12 can prevent the dust falling into the dust collection box 11 from being rolled up by the airflow, causing secondary dust and reducing the dust removal efficiency. Second, it blocks the downward airflow and causes it to flow upward in the opposite direction, so that the airflow does not come into contact with the dust in the dust collection box 11 and avoids the dust in the dust collection box 11 being rolled up.

[0022] The horizontal pipes on two adjacent vertical cylinders 6 are staggered. This staggering means that the flue gas discharged from the honeycomb ceramic 7 of the inner vertical cylinder 6 will not blow directly onto the honeycomb ceramic 7 of the adjacent outer vertical cylinder 6, but will blow onto the vertical cylinder 6. This has two advantages: first, when the flue gas blows onto the vertical cylinder 6, the dust in the flue gas will collide with the vertical cylinder 6 and be separated from the flue gas; second, after the flue gas collides with the vertical cylinder 6, it will disperse from all sides, and the flue gas will continue to collide and mix, generating turbulence, which will promote the separation of dust in the flue gas.

[0023] A vertical pipe 13, sealed at both ends, is installed in the annular space between the shell 1 and the outermost vertical cylinder 6. Several air blowing ports are evenly distributed vertically along the inner side of the vertical pipe 13, and an air inlet pipe 14 is connected to the outer side of the vertical pipe 13. In actual use, a pulse solenoid valve can be installed on the air inlet pipe 14. After a period of operation, a certain amount of dust will accumulate inside the honeycomb ceramic 7. The pulse solenoid valve can be opened to backflush and clean the honeycomb ceramic 7, ensuring the filtration efficiency and purification effect of the honeycomb ceramic 7 for ultra-high temperature flue gas from steelmaking. To improve the backflush cleaning effect, a backflush mechanism can also be installed outside each vertical cylinder 6 to perform backflush cleaning on the honeycomb ceramic 7 installed on each vertical cylinder 6.

[0024] To prevent the loss and waste of flue gas heat, an insulation layer can be installed on the outer wall of the shell 1.

Claims

1. A device for cleaning steelmaking ultra-high temperature flue gas, comprising a shell (1) and a flue gas inlet pipe (2), characterized in that: The interior of the housing (1) is divided into a spiral dust collection chamber (4) and a fine filtration chamber (5) from bottom to top by a partition (3). The smoke inlet pipe (2) is tangentially connected to the upper part of the spiral dust collection chamber (4). Multiple vertical cylinders (6) are concentrically arranged from the outside to the inside of the fine filtration chamber (5). The upper end of the vertical cylinder (6) is sealed to the top of the housing (1), and the lower end of the vertical cylinder (6) is sealed to the partition (3). Several horizontal pipes are evenly distributed on the side wall of each vertical cylinder (6), and honeycomb ceramic is installed inside the horizontal pipes. The ceramic (7) has a smoke exhaust pipe on the side wall of the fine filter chamber (5). An upper air pipe (8) is provided on the vertical center line of the fine filter chamber (5). The lower end of the upper air pipe (8) passes through the partition (3) and connects to the spiral dust collector (4). A ring pipe (9) is provided at the bottom of the annular space between two adjacent vertical cylinders (6) and at the bottom of the innermost vertical cylinder (6). A dust suction port is provided at the bottom of the ring pipe (9). A dust suction pipe (10) extending out of the fine filter chamber (5) is provided on the ring pipe (9).

2. The ultra-high temperature flue gas purification device for steelmaking according to claim 1, characterized in that: The upper end of the upper air pipe (8) extends into the upper part of the fine filter chamber (5) and is equipped with a blocking plate. Several air outlet holes are evenly distributed on the pipe wall of the upper air pipe (8).

3. The ultra-high temperature flue gas purification device for steelmaking according to claim 1, characterized in that: The lower end of the spiral dust removal chamber (4) is connected to a dust collection box (11), and a dust pump is installed on the dust suction pipe (10). The end of the dust suction pipe (10) is connected to the dust collection box (11).

4. The ultra-high temperature flue gas purification device for steelmaking according to claim 3, characterized in that: The upper part of the dust collection box (11) is provided with a dustproof plate (12) with a convex upper part and a concave lower edge.

5. The ultra-high temperature flue gas purification device for steelmaking according to claim 1, characterized in that: The horizontal tubes installed on two adjacent vertical tubes (6) are staggered.

6. The ultra-high temperature flue gas purification device for steelmaking according to claim 1, characterized in that: The annular space between the shell (1) and the outermost vertical tube (6) is provided with a vertical tube (13) with both ends sealed. Several air inlets are evenly distributed on the inner side of the vertical tube (13) in the vertical direction, and an air inlet pipe (14) is connected to the outer side of the vertical tube (13).

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