One-time dry dust removal system for ultra-clean converter

Abstract

The invention discloses an ultra-clean converter one-time dry dust removal system which comprises a high-effect heat exchanger, a rotational flow heat recovery device, an electrostatic dust remover, a high-temperature-resistant anti-explosion ultra-clean dust remover, a cooling replacement fan, a clean gas pipe, a gas axial flow fan and a gas washing dehydrator. A converter sequentially passes through a high-efficiency heat exchanger and a rotational flow heat recovery device and then enters an electrostatic dust collector and / or a high-temperature-resistant explosion-proof ultra-clean dust collector to form clean coal gas, the concentration of an outlet of the ultra-clean dust collector can be kept stable below 5mg / Nm < 3 >, and then the clean coal gas is washed and cooled through a coal gas axial flow fan and a coal gas cooling dehydrator and then is conveyed to a coal gas switching station. Conveying the qualified coal gas to a coal gas cabinet; unqualified coal gas is sent to a diffusion chimney to be ignited and diffused.

Description

Technical Field

[0001] The invention discloses an ultra-clean converter primary dry dust removal system, and relates to the field of environmental protection equipment. Background Art

[0002] At present, most of the newly built and rebuilt converters of steel enterprises adopt dry dust removal systems. For example, Chinese document CN216274225U provides an improved converter primary flue gas dry dust removal system, including an evaporative cooler, an output end of the evaporative cooler is connected to an electrostatic precipitator, an output end of the electrostatic precipitator is connected to a fan, an output end of the fan is connected to a muffler, an output end of the muffler is connected to a high-efficiency cooling and demisting tower, an output end of the high-efficiency cooling and demisting tower is connected to a switching station, and an output end of the switching station is connected to an ignition and dispersion tower. In this document, an evaporative cooler is used for cooling, and generally the flue gas temperature is directly reduced from 900°C to about 250°C, and heat is not recovered.

[0003] The existing converter primary dry dust removal system uses an electrostatic precipitator process, which has the following problems: when the electrostatic precipitator is under maintenance, smoke will come out of the discharge chimney; in addition, due to the different degrees of discharge of the high-voltage power supply, the voltage and current between the pole wire and the plate will fluctuate greatly, resulting in the dust removal efficiency of the electrostatic precipitator being affected and the dust emission concentration at the outlet of the discharge chimney fluctuating greatly. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an ultra-clean converter primary dry dust removal system, which uses a high-efficiency heat exchanger and a heat recovery device to recover high-quality heat energy. At the same time, the ultra-clean dust collector process can maintain a stable concentration of 5mg / Nm 3 the following.

[0005] To achieve the above object, the present invention is achieved through the following technical solutions:

[0006] An ultra-clean converter primary dry dust removal system, comprising a high-efficiency heat exchanger, a banana bend separator, a cyclone heat recovery device, a water-cooled chain conveyor, a raw gas pipe, an electrostatic precipitator, a high-temperature resistant explosion-proof ultra-clean dust collector, a cooling replacement fan, a clean gas pipe, a gas axial flow fan, and a gas washing dehydrator;

[0007] The inlet of the high-efficiency heat exchanger is connected to the converter through the vaporization cooling flue. The raw gas of the converter enters the high-efficiency heat exchanger for heat exchange recovery. A banana-bend dust collector is provided between the high-efficiency heat exchanger and the cyclone heat recovery device. A water-cooled chain conveyor is provided at the bottom of the banana-bend dust collector to capture coarse ash and transport it out.

[0008] The output end of the cyclone heat recovery device is connected to the electrostatic precipitator and / or the high temperature resistant explosion-proof ultra-clean precipitator through the raw coal gas pipe;

[0009] The output end of the high-temperature resistant and explosion-proof ultra-clean dust collector is connected to the clean gas pipe. The gas in the clean gas pipe is washed and cooled by the gas axial flow fan and the gas cooling dehydrator and then sent to the gas switching station. The qualified gas is sent to the gas tank after testing; the unqualified gas is sent to the discharge chimney for ignition and discharge.

[0010] Further, the electrostatic precipitator and the high temperature resistant explosion-proof ultra-clean precipitator can work in series, or the high temperature resistant explosion-proof ultra-clean precipitator can work alone; wherein the electrostatic precipitator inlet main pipe is provided with a first metal hard-sealed butterfly valve and a first explosion-proof glasses valve, and the outlet main pipe is provided with the second metal hard-sealed butterfly valve and the second explosion-proof glasses valve;

[0011] The inlet main pipe of the high temperature resistant explosion-proof ultra-clean dust collector is provided with a third metal hard-sealed butterfly valve and a third explosion-proof glasses valve.

[0012] Furthermore, the outlet temperature of the vaporization cooling flue is 750℃~850℃. After the raw gas passes through the high-efficiency gas-water heat exchanger, the high-quality heat in the raw gas is efficiently recovered, and the temperature drops to 600℃ before entering the banana bend dust collector. The banana bend dust collector is equipped with multiple layers of baffles, and the axial extension lines of the banana bend dust collector inlet and outlet have an angle that causes the airflow direction to turn 180°.

[0013] Further, the water-cooled chain conveyor is connected to an ash discharge pipe, on which a pneumatic three-way discharge valve, a normal pneumatic double-layer flap valve and an emergency pneumatic double-layer flap valve are provided;

[0014] The water-cooled chain conveyor normally discharges ash to the intermediate ash bin through a pneumatic three-way discharge valve, a normal pneumatic double-layer flap valve and a bucket elevator, and the intermediate ash bin is fed into the converter;

[0015] The water-cooled chain conveyor discharges ash to the coarse ash bin through a pneumatic three-way discharge valve and an emergency pneumatic double-layer flap valve. The coarse ash bin is used to transport the coarse ash out through a vacuum suction vehicle or to pneumatically transport the coarse ash to the intermediate ash bin through a bin pump.

[0016] Furthermore, a cyclone device and a heat recovery device are provided in the cyclone heat recovery device. The raw gas can effectively separate coarse dust particles and enhance heat exchange after the cyclone. The outlet of the cyclone heat recovery device is connected to the raw gas pipe.

[0017] Furthermore, two or more high-temperature resistant explosion-proof ultra-clean dust collectors can be used in combination. The inlet of each dust collector is connected to the raw gas pipe, the outlet of each dust collector is connected to the clean gas pipe, the ash outlet of each dust collector is transported to the fine ash bin through the ash collecting pipe, each dust collector is equipped with an explosion relief valve, a vibrator, a heating coil and an insulation structure, and each high-temperature resistant explosion-proof ultra-clean dust collector is connected to the cooling replacement fan through a pipeline.

[0018] Furthermore, a muffler is provided on the pipeline between the gas axial flow fan and the gas washing and dehydrating device. The clean gas is sent to the gas switching station after being washed and cooled by the gas axial flow fan, the muffler and the gas washing and dehydrating device. A recovery cup valve is provided on the pipeline of qualified gas output from the gas switching station, and a release cup valve is provided on the pipeline of unqualified gas output from the gas switching station.

[0019] Furthermore, a nitrogen ejector pipe and a purge pipe are provided on one side of the venting chimney. The medium-pressure nitrogen transported by the nitrogen ejector pipe has a pressure ≥1.2MPa, and the transport medium of the purge pipe is low-pressure nitrogen or saturated steam, and the pressure of the low-pressure nitrogen or saturated steam is ≥0.6MPa.

[0020] The ultra-clean converter primary dry dust removal system of the present invention has the following beneficial effects:

[0021] 1. The present invention eliminates the traditional evaporative cooling water spraying, and solves the stubborn problem of easy scaling of evaporative cooling; the waste heat of converter gas is fully recovered, the steam recovery amount per ton of steel is increased by more than 50kg, and the system is more energy-efficient;

[0022] 2. After the high temperature resistant explosion-proof ultra-clean dust collector process is adopted in the present invention, the outlet concentration of the high temperature resistant explosion-proof ultra-clean dust collector can maintain a stable 5mg / Nm 3 Below, the system is more environmentally friendly.

[0023] 3. The present invention not only solves the problem of high-quality heat not being recovered, but also solves the problem of excessive emissions from the vent chimney caused by maintenance of the electrostatic precipitator, and solves the problem of large fluctuations in emission concentration at the outlet of the vent chimney. It is particularly suitable for dry dust removal projects of primary flue gas from converters and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0025] Figure 2 yes Figure 1 A is an enlarged view.

[0026] Figure 3 yes Figure 1 Middle B is an enlarged view.

[0027] Figure 4 yes Figure 1 Middle C enlarged image. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings:

[0029] Example: See Figures 1 to 4, an ultra-clean converter primary dry dust removal system, comprising a high-efficiency heat exchanger 3, a banana bend separator 4, a cyclone heat recovery device 5, a water-cooled chain conveyor 6, a raw gas pipe 15, an electrostatic precipitator 16, a high-temperature resistant explosion-proof ultra-clean dust collector 23, a cooling replacement fan 26, a clean gas pipe 27, a gas axial flow fan 28, and a gas washing dehydrator 30;

[0030] The inlet of the high-efficiency heat exchanger 3 is connected to the converter 1 through the vaporization cooling flue 2. The raw gas of the converter 1 enters the high-efficiency heat exchanger 3 for heat exchange recovery. A banana-bend dust collector 4 is provided between the high-efficiency heat exchanger 3 and the cyclone heat recovery device 5. A water-cooled chain conveyor 6 is provided at the bottom of the banana-bend dust collector 4 to capture coarse ash and transport it out.

[0031] The output end of the cyclone heat recovery device 5 is connected to the electrostatic precipitator 16 and / or the high temperature resistant explosion-proof ultra-clean precipitator 23 through the raw coal gas pipe 15;

[0032] The output end of the high temperature resistant explosion proof ultra clean dust collector 23 is connected to the clean gas pipe 27. The gas in the clean gas pipe 27 is washed and cooled by the gas axial flow fan 28 and the gas cooling dehydrator 30 and then sent to the gas switching station. The qualified gas is sent to the gas holder 32 after detection; the unqualified gas is sent to the venting chimney 34 for ignition and venting. The converter 1, vaporization cooling flue 2 and gas holder 32 involved do not belong to the dry dust removal system. The converter is defined as: decarbonization converter or dephosphorization converter or vanadium extraction converter or lava homogenization furnace or stainless steel converter. The ultra clean converter primary dry dust removal system of the present invention is suitable for 50t~400t converters.

[0033] The ultra-clean converter primary dry dust removal system structure of the present invention specifically includes a high-efficiency heat exchanger 3, a banana bend separator 4, a cyclone heat recovery device 5, a water-cooled chain conveyor 6, a pneumatic three-way discharge valve 7, a normal pneumatic double-layer flap valve 8, a normal ash discharge pipe 9, a bucket elevator 10, an intermediate ash bin 11, an emergency pneumatic double-layer flap valve 12, an emergency ash discharge pipe 13, a coarse ash bin 14, a waste gas pipe 15, an electrostatic precipitator 16, a first metal hard-sealed butterfly valve 17, a first An explosion-proof glasses valve 18, a second metal hard-sealed butterfly valve 19, a second explosion-proof glasses valve 20, a third metal hard-sealed butterfly valve 21, a third explosion-proof glasses valve 22, a high-temperature resistant explosion-proof ultra-clean dust collector 23, a silo pump 24, a fine ash silo 25, a cooling replacement fan 26, a clean gas pipe 27, a gas axial flow fan 28, a muffler 29, a gas washing and dehydrating device 30, a recovery cup valve 31, a venting cup valve 33, a venting chimney 34, a nitrogen ejector pipe 35 and a purge pipe 36.

[0034] The converter 1 and the high-efficiency heat exchanger 3 are connected through the vaporization cooling flue 2, and a banana bend separator 4 is provided between the high-efficiency heat exchanger 3 and the cyclone heat recovery device 5; a heat exchange close-packed pipe is provided inside the high-efficiency heat exchanger 3 to take away the high-quality heat in the converter gas through heat exchange, thereby reducing the temperature of the converter gas;

[0035] The banana bend separator 4 is provided with multiple layers of baffles, which can increase the residence time of the dusty converter gas in the banana bend separator 4 and improve the dust removal efficiency; a water-cooled chain conveyor 6 is provided at the bottom of the banana bend separator 4 to transport the captured coarse ash out; the material of the banana bend separator 4 is stainless steel or boiler steel or Q345R or other functional materials, and the baffles of the banana bend separator 4 can be used in combination of two or more layers.

[0036] The cyclone heat recovery device 5 is provided with a cyclone device and a heat recovery device; after the raw gas passes through the cyclone, coarse dust particles can be effectively separated and heat exchange can be enhanced, which is beneficial to heat recovery.

[0037] The ash discharge pipe of the water-cooled chain conveyor 6 is provided with a pneumatic three-way discharge valve 7, a normal pneumatic double-layer flap valve 8 and an emergency pneumatic double-layer flap valve 12;

[0038] The water-cooled chain conveyor 6 normally discharges ash to the intermediate ash bin 11 through the pneumatic three-way discharge valve 7, the normal pneumatic double-layer flap valve 8 and the bucket elevator 10, and the intermediate ash bin 11 feeds the material into the converter 1;

[0039] The water-cooled chain conveyor 6 discharges ash to the coarse ash bin 14 through the pneumatic three-way discharge valve 7 and the emergency pneumatic double-layer flap valve 12. The coarse ash bin 14 transports the coarse ash out of the coarse ash through a vacuum suction vehicle or pneumatically conveys the coarse ash to the intermediate ash bin 11 through a bin pump;

[0040] The cyclone heat recovery device 5 and the electrostatic precipitator 16 are connected via a raw gas pipe 15;

[0041] The inlet main pipe of the electrostatic precipitator 16 is provided with a first metal hard-sealed butterfly valve 17 and a first explosion-proof glasses valve 18, and the outlet main pipe is provided with a second metal hard-sealed butterfly valve 19 and a second explosion-proof glasses valve 20;

[0042] The inlet main pipe of the high temperature resistant explosion proof ultra clean dust collector 23 is provided with a third metal hard seal butterfly valve 21 and a third explosion proof glasses valve 22;

[0043] The cylinder of the high temperature resistant explosion-proof ultra-clean dust collector 23 is provided with an explosion relief valve, a vibrator, a heating coil and a thermal insulation structure, and the thermal insulation structure can be a thermal insulation layer made of thermal insulation material;

[0044] The high temperature resistant explosion proof ultra clean dust collector 23 is provided with a cooling replacement fan 26; once the dust collector is overhauled, after the nitrogen replaces the coal gas, the cooling replacement fan 26 is started to blow air into the dust collector cylinder to play the role of cooling and ventilation;

[0045] The high temperature resistant explosion proof ultra clean dust collector 23 pneumatically conveys the collected fine ash to the fine ash bin 25 through the bin pump 24; the fine ash bin 25 is provided with a vacuum suction tank truck interface;

[0046] A clean gas pipe 27 is provided at the outlet of the high temperature explosion-proof ultra-clean dust collector 23. After the clean gas passes through the gas axial flow fan 28 and the muffler 29, it is washed and cooled by the gas washing and dehydrating device 30 and then sent to the gas switching station. The qualified gas is sent to the gas cabinet 32 ​​through the recovery cup valve 31; the unqualified gas is sent to the release chimney 34 through the release cup valve 33 for ignition and release.

[0047] The electrostatic precipitator 16 and the high temperature explosion-proof ultra-clean precipitator 23 can work in series, or after closing the first metal hard-sealed butterfly valve 17, the first explosion-proof glasses valve 18, the second metal hard-sealed butterfly valve 19, the second explosion-proof glasses valve 20 and opening the third metal hard-sealed butterfly valve 21 and the third explosion-proof glasses valve 22, the high temperature explosion-proof ultra-clean precipitator can also work alone. When the electrostatic precipitator is used in combination with the high temperature explosion-proof ultra-clean precipitator, it is equivalent to adding another dust removal at the outlet of the electrostatic precipitator, and the dust coming out of the electrostatic precipitator is captured by the high temperature explosion-proof ultra-clean precipitator, thereby overcoming the corresponding defects mentioned in the background technology.

[0048] The emission chimney 34 is provided with a nitrogen ejector pipe 35 and a purge pipe 36 .

[0049] The process flow of the ultra-clean converter primary dry dust removal system of the present invention is as follows:

[0050] Converter 1 → vaporization cooling flue 2 → high-efficiency heat exchanger 3 → banana bend separator 4 → cyclone heat recovery device 5 → raw gas pipe 15 → electrostatic precipitator 16 / high temperature resistant explosion-proof ultra-clean dust collector 23 → clean gas pipe 27 → gas axial flow fan 28 → muffler 29 → gas washing and dehydrating device 30 → recovery cup valve 31 / discharge cup valve 33 → / gas cabinet 32 ​​discharge chimney 34.

[0051] The outlet temperature of the enhanced vaporization cooling flue 2 is 750℃~850℃ (generally 800℃). After the raw gas passes through the high-efficiency heat exchanger 3 for gas-water high-efficiency heat exchange, the high-quality heat in the raw gas is efficiently recovered, and the temperature drops to 600℃ before entering the banana bend separator 4.

[0052] When the dusty waste gas passes through the banana bend separator 4, it first collides with multiple baffles. Since the flow direction also changes by 180°, under the action of gravity and centrifugal force, 35% to 45% (generally 40%) of the coarse particle dust is captured in the banana bend separator 4 and falls into the water-cooled chain conveyor 6.

[0053] The water-cooled chain conveyor 6 is arranged horizontally, is process-linked with the converter 1, and operates periodically during the smelting period.

[0054] Under normal circumstances, the coarse ash collected by the water-cooled chain conveyor 6 enters the bucket elevator 10 through the pneumatic three-way discharge valve 7 and the normal pneumatic double-layer flap valve 8 via the normal ash discharge pipe 9, and is discharged to the intermediate ash bin 11 by the bucket elevator 10; the intermediate ash bin 11 feeds each furnace into the converter 1 and can store coarse ash from up to two furnaces.

[0055] When the bucket elevator 10 is under maintenance, the coarse ash collected by the water-cooled chain conveyor 6 is urgently discharged to the coarse ash bin 14 through the pneumatic three-way discharge valve 7 and the emergency pneumatic double-layer flap valve 12 via the emergency ash discharge pipe 13. The coarse ash bin 14 transports the coarse ash out through the vacuum suction vehicle or pneumatically conveys the coarse ash to the intermediate ash bin 11 through a bin pump.

[0056] The explosion relief valve on the high temperature resistant explosion-proof ultra-clean dust collector 23 is equipped with three-stage explosion relief. Once the pressure inside the high temperature resistant explosion-proof ultra-clean dust collector 23 exceeds 6500Pa, the explosion relief valve will start to release pressure to protect the safety of equipment and system; once the temperature inside the dust collector is lower than 100℃, the heating coil will work and stop working when it is heated to 120℃.

[0057] Qualified converter gas enters the gas scrubber and dehydrator 30, and after being cooled by saturated water spray, the temperature drops from 150°C to below 70°C, so that the gas tank 32 can store more converter gas.

[0058] In the system of the present invention, once the system is powered off or the gas axial flow fan 28 fails, the pneumatic shut-off valve on the nitrogen ejector pipe 35 is opened, and nitrogen is ejected for 15 seconds to ensure the safety of the system. When the converter gas is recovered by venting, the pneumatic shut-off valve on the purge pipe 36 is opened, and nitrogen or steam is purged for 30 seconds to prevent the venting chimney 34 from backfiring. In the present invention, the cylinder diameter of the high-temperature resistant explosion-proof ultra-clean dust collector 23 is: 1.0~10m, and 2, 3, 4, 6 or more combinations can be used. In one embodiment, the filter material of the high-temperature resistant explosion-proof ultra-clean dust collector 23 is stainless steel, FEMEX or P84; the filter material of the ultra-clean dust collector can also be aramid ≥20% and aramid ≥20%, or anti-static glass fiber coated filter material, and the content of stainless steel conductive fiber filaments is ≥6%. The dust concentration at the outlet of the high-temperature resistant explosion-proof ultra-clean dust collector 23 is ≤5mg / Nm 3 .

[0059] In one embodiment of the system of the present invention, the pressure of the medium-pressure nitrogen delivered by the nitrogen ejector pipe 35 is ≥1.2 MPa.

[0060] In one embodiment of the system of the present invention, the purge pipe 36 uses low-pressure nitrogen or saturated steam as the conveying medium, and the pressure of the low-pressure nitrogen or saturated steam is ≥ 0.6 MPa.

[0061] The above records are only embodiments of the present invention. Any modification or change made by a person familiar with the present technology using the present invention shall fall within the patent scope claimed by the present invention and shall not be limited to those disclosed in the embodiments.

Claims

1. An ultra-clean converter primary dry dust removal system, characterized in that: Including high-efficiency heat exchanger, banana bend separator, cyclone heat recovery device, water-cooled chain conveyor, raw gas pipe, electrostatic precipitator, high temperature resistant explosion-proof ultra-clean dust collector, cooling replacement fan, clean gas pipe, gas axial flow fan, gas washing dehydrator; The inlet of the high-efficiency heat exchanger is connected to the converter through the vaporization cooling flue. The raw gas of the converter enters the high-efficiency heat exchanger for heat exchange recovery. A banana-bend dust collector is provided between the high-efficiency heat exchanger and the cyclone heat recovery device. A water-cooled chain conveyor is provided at the bottom of the banana-bend dust collector to capture coarse ash and transport it out. The output end of the cyclone heat recovery device is connected to the electrostatic precipitator and / or the high temperature resistant explosion-proof ultra-clean precipitator through the raw coal gas pipe; The output end of the high-temperature resistant and explosion-proof ultra-clean dust collector is connected to the clean gas pipe. The gas in the clean gas pipe is washed and cooled by the gas axial flow fan and the gas cooling dehydrator and then sent to the gas switching station. The qualified gas is sent to the gas tank after testing; the unqualified gas is sent to the discharge chimney for ignition and discharge.

2. The ultra-clean converter primary dry dust removal system according to claim 1 is characterized in that: The electrostatic precipitator and the high temperature explosion-proof ultra-clean precipitator can work in series, or the high temperature explosion-proof ultra-clean precipitator can work alone; The electrostatic precipitator inlet main pipe is provided with a first metal hard-sealed butterfly valve and a first explosion-proof glasses valve, and the outlet main pipe is provided with the second metal hard-sealed butterfly valve and the second explosion-proof glasses valve; The inlet main pipe of the high temperature resistant explosion-proof ultra-clean dust collector is provided with a third metal hard-sealed butterfly valve and a third explosion-proof glasses valve.

3. The ultra-clean converter primary dry dust removal system according to claim 1 is characterized in that: The outlet temperature of the vaporization cooling flue is 750℃~850℃. After the raw gas passes through the high-efficiency gas-water heat exchanger, the high-quality heat in the raw gas is efficiently recovered, and the temperature drops to 600℃ before entering the banana bend dust collector. The banana bend dust collector is equipped with multiple baffles. The axial extension lines of the banana bend dust collector inlet and outlet have an angle that causes the airflow direction to turn 180°.

4. The ultra-clean converter primary dry dust removal system according to claim 1 is characterized in that: The water-cooled chain conveyor is connected to the ash discharge pipe, which is equipped with a pneumatic three-way discharge valve, a normal pneumatic double-layer flap valve and an emergency pneumatic double-layer flap valve; The water-cooled chain conveyor normally discharges ash to the intermediate ash bin through a pneumatic three-way discharge valve, a normal pneumatic double-layer flap valve and a bucket elevator, and the intermediate ash bin is fed into the converter; The water-cooled chain conveyor discharges ash to the coarse ash bin through a pneumatic three-way discharge valve and an emergency pneumatic double-layer flap valve. The coarse ash bin is used to transport the coarse ash out through a vacuum suction vehicle or to pneumatically transport the coarse ash to the intermediate ash bin through a bin pump.

5. The ultra-clean converter primary dry dust removal system according to claim 1 is characterized in that: The cyclone heat recovery device is equipped with a cyclone device and a heat recovery device. The raw gas can effectively separate coarse dust particles and enhance heat exchange after the cyclone. The outlet of the cyclone heat recovery device is connected to the raw gas pipe.

6. The ultra-clean converter primary dry dust removal system according to claim 1, characterized in that: High temperature resistant explosion-proof ultra-clean dust collectors can be used in combination of 2 or more. The inlet of each dust collector is connected to the raw gas pipe, the outlet of each dust collector is connected to the clean gas pipe, the ash outlet of each dust collector is transported to the fine ash bin through the ash collecting pipe, each dust collector is equipped with an explosion relief valve, a vibrator, a heating coil and an insulation structure, and each high temperature resistant explosion-proof ultra-clean dust collector is connected to the cooling replacement fan through a pipeline.

7. The ultra-clean converter primary dry dust removal system according to claim 1 is characterized in that: A muffler is provided on the pipeline between the gas axial flow fan and the gas washing and dehydrating device. The clean gas is sent to the gas switching station after being washed and cooled by the gas axial flow fan, the muffler and the gas washing and dehydrating device. A recovery cup valve is provided on the pipeline of qualified gas output from the gas switching station, and a release cup valve is provided on the pipeline of unqualified gas output from the gas switching station.

8. The ultra-clean converter primary dry dust removal system according to any one of claims 1 to 7, characterized in that: A nitrogen ejector and a purge pipe are provided on one side of the vent chimney. The medium-pressure nitrogen transported by the nitrogen ejector is ≥1.2MPa, and the transport medium of the purge pipe is low-pressure nitrogen or saturated steam, and the pressure of the low-pressure nitrogen or saturated steam is ≥0.6MPa.

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