Dry dust removal system for ultra-clean converter gas

Abstract

The invention discloses an ultra-clean converter gas dry dedusting system which is characterized in that a converter is connected with a high-effect heat exchanger through an evaporative cooling flue, a banana bend deduster is arranged between the high-effect heat exchanger and a rotational flow heat recovery device, and a water cooling roller is arranged at the bottom of the banana bend deduster to capture coarse ash; the water cooling roller and the converter are linked to periodically run during smelting, the output end of the rotational flow heat recovery device is connected with the electrostatic dust collector and the high-temperature-resistant explosion-proof ultra-clean dust collector through a raw gas pipe to carry out fine dust removal operation, and clean gas is sent to a gas switching station after passing through a gas axial flow fan and a silencer; qualified coal gas is sent to a coal gas cabinet through detection, and unqualified coal gas is sent to a diffusion chimney to be ignited and diffused. Traditional evaporation cold spray water is omitted, and after the high-temperature-resistant explosion-proof ultra-clean dust remover process is adopted, the converter gas waste heat recovery efficiency is high, and the system has the advantages of energy conservation, environmental protection and the like.

Description

Technical Field

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

[0002] With the demand for steel enterprises to create A and the environmental protection requirements of ultra-low emissions, most newly built and rebuilt converters adopt dry dust removal systems. Currently, the common dry dust removal systems mainly include the first-generation converter primary dry dust removal system (LT method and DDS method) and the improved second-generation converter primary dry dust removal system (set up behind the electrostatic precipitator: coal cooling front, double coal cooling, coal cooling + metal filter cartridge, wet electrostatic precipitator, etc.).

[0003] The main problems of the existing converter primary dry dust removal system are: first, the temperature is cooled by spraying water mist through the evaporative cooler, directly reducing the temperature from 900℃ to about 250℃, and this part of high-quality heat is wasted and not recovered; second, the electrostatic precipitator process is used. When the electrostatic precipitator is overhauled, it will cause smoke from the emission chimney; in addition, due to the different degree of discharge of the high-voltage power supply, the voltage and current between the poles and the plates 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 emission chimney fluctuating greatly.

[0004] Chinese document CN110184411A relates to a fully dry dust removal system for converter primary flue gas with high efficiency, energy saving and ultra-clean emission. The converter is connected to a heat pipe waste heat boiler through a vaporization cooling flue, and the vaporization cooling flue and the heat pipe waste heat boiler are connected to a waste water steam system. The heat pipe waste heat boiler is connected to a multi-tube explosion-proof flame arrester, a pulse bag dust collector, a fan, a switching station and a chimney in sequence through a flue gas duct. The switching station is also connected to a gas tank. The heat pipe waste heat boiler, the multi-tube explosion-proof flame arrester and the pulse bag dust collector are all connected to a pneumatic ash conveying system. In this scheme, after the converter flue gas enters the heat pipe waste heat boiler for cooling, the outlet flue gas temperature passing through the multi-tube explosion-proof flame arrester needs to be stabilized within the tolerance range of the bag dust collector. If the temperature is too high, the filter bag is easily burned. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an ultra-clean converter gas dry dust removal system, which has the advantages of energy saving and environmental protection.

[0006] To achieve the above object, the present invention is achieved through the following technical solutions:

[0007] An ultra-clean converter gas dry dust removal system, comprising a high-efficiency heat exchanger, a banana bend dust collector, a cyclone heat recovery device, a water-cooled drum, an electrostatic dust collector, a high-temperature resistant explosion-proof ultra-clean dust collector, a cooling replacement fan, a clean gas pipe, a gas axial flow fan, a muffler, and a gas washing and dehydrating device;

[0008] The converter and the high-efficiency heat exchanger are connected through a vaporization cooling flue. A banana-bend dust collector is provided between the high-efficiency heat exchanger and the cyclone heat recovery device. A water-cooling drum is provided at the bottom of the banana-bend dust collector to capture coarse ash. The water-cooling drum and the converter are interlocked and run periodically during smelting. The output end of the cyclone heat recovery device is connected to the electrostatic dust collector and the high-temperature explosion-proof ultra-clean dust collector through a raw gas pipe for fine dust removal. The high-temperature explosion-proof ultra-clean dust collector is connected to a cooling replacement fan. A clean gas pipe is provided at the outlet of the high-temperature explosion-proof ultra-clean dust collector. The clean gas passes through a gas axial flow fan and a muffler and is sent to a gas switching station.

[0009] The qualified gas is washed and cooled by the gas cooling and dehydrating device and then sent to the gas cabinet;

[0010] The unqualified gas is sent to the vent chimney and ignited and released.

[0011] Further, a first control valve is provided on the inlet main pipe of the electrostatic precipitator, and a second control valve is provided on the outlet main pipe;

[0012] The third control valve is set on the inlet main pipe of the high temperature resistant explosion-proof ultra-clean dust collector;

[0013] The outlet main pipe of the electrostatic precipitator is connected with the inlet of the high-temperature resistant explosion-proof ultra-clean precipitator.

[0014] Furthermore, the high-temperature resistant explosion-proof ultra-clean dust collectors are used in combination of two or more, the air 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 provided 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.

[0015] Furthermore, the cylinder diameter of the high temperature explosion-proof ultra-clean dust collector is 1.0 to 10 m, and the filter material of the high temperature explosion-proof ultra-clean dust collector is stainless steel, FEMES or P84, or

[0016] The filter materials of high temperature resistant explosion-proof ultra-clean dust collector include aramid ≥20% and aramid ≥20% or anti-static glass fiber coated filter materials, and the content of stainless steel conductive fiber filaments is ≥6%.

[0017] Furthermore, the outlet temperature of the vaporization cooling flue is 750℃~850℃, and the raw gas passes through the high-efficiency heat exchanger, banana bend dust collector and cyclone heat recovery device in turn. After the high-efficiency heat exchange between gas and water in the high-efficiency 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, and the axial extension lines of the inlet and outlet of the banana bend dust collector have an angle that makes the airflow direction turn 180° and enter the cyclone heat recovery device. The cyclone heat recovery device is equipped with a cyclone device and a heat recovery device. After the cyclone, the raw gas can effectively separate coarse dust particles and enhance heat exchange, which is beneficial to heat recovery.

[0018] Furthermore, a pneumatic three-way discharge valve, a normal pneumatic double-layer flap valve and an emergency pneumatic double-layer flap valve are provided on the ash discharge pipe of the water-cooled drum;

[0019] The water-cooled drum normally discharges ash to the intermediate ash bin through the pneumatic three-way discharge valve, the normal pneumatic double-layer flap valve and the bucket elevator, and the intermediate ash bin is fed into the converter;

[0020] The water-cooled drum discharges ash to the coarse ash silo through the pneumatic three-way unloading valve and the emergency pneumatic double-layer flap valve. The coarse ash silo is transported out of the coarse ash through the vacuum suction vehicle or pneumatically transported to the intermediate ash silo through the silo pump.

[0021] Furthermore, the pipelines in the gas switching station are equipped with recovery cup valves and vent cup valves. The qualified gas tested passes through the recovery cup valve, is washed and cooled by the gas cooling dehydrator, and then is sent to the gas tank. The qualified converter gas enters the gas washing dehydrator, and after being cooled by saturated water spray, the temperature drops to below 70°C; the unqualified gas is sent to the vent chimney through the vent cup valve for ignition and release.

[0022] 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.

[0023] The ultra-clean converter gas dry dust removal system of the present invention has the following beneficial effects:

[0024] 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;

[0025] 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of an embodiment of an ultra-clean converter gas dry dust removal system of the present invention.

[0027] Figure 2 yes Figure 1 A is an enlarged view.

[0028] Figure 3 yes Figure 1 Middle B is an enlarged view.

[0029] Figure 4 yes Figure 1 Middle C enlarged image. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings:

[0031] Example: See Figures 1 to 4 A super-clean converter gas dry dust removal system comprises a high-efficiency heat exchanger 3, a banana bend dust collector 4, a cyclone heat recovery device 5, a water-cooled drum 6, an electrostatic precipitator 16, a high-temperature resistant and explosion-proof super-clean dust collector 23, a cooling replacement fan 26, a clean gas pipe 27, a gas axial flow fan 28, a muffler 29, and a gas washing and dehydrating device 31; the converter 1 and the high-efficiency heat exchanger 3 are connected through a vaporization cooling flue 2, a banana bend dust collector 4 is arranged between the high-efficiency heat exchanger 3 and the cyclone heat recovery device 5, a water-cooled drum 6 is arranged at the bottom of the banana bend dust collector 4 to capture coarse ash, and the water-cooled drum 6 and the converter are connected through a vaporization cooling flue 2. The furnace 1 is interlocked to operate periodically during the smelting period. The output end of the cyclone heat recovery device 5 is connected to the electrostatic precipitator 26 and the high-temperature explosion-proof ultra-clean dust collector 23 through the raw gas pipe 15 for fine dust removal. The high-temperature explosion-proof ultra-clean dust collector 23 is connected to the cooling replacement fan 26. A clean gas pipe 27 is set at the outlet of the high-temperature explosion-proof ultra-clean dust collector. The clean gas passes through the gas axial flow fan 28 and the muffler 29 and is sent to the gas switching station; the qualified gas is washed and cooled by the gas cooling dehydrator 31 and then sent to the gas cabinet 32; the unqualified gas is sent to the release chimney 34 for ignition and release.

[0032] The ultra-clean converter gas dry dust removal system of the present invention is suitable for 50t-400t converters. The converter 1 is defined as: a decarburization converter or a dephosphorization converter or a vanadium extraction converter or a lava homogenization furnace or a stainless steel converter. The material of the banana bend dust collector 4 is stainless steel or boiler steel or Q345R.

[0033] The ultra-clean converter gas dry dust removal system of the present invention specifically includes a high-efficiency heat exchanger 3, a banana bend dust collector 4, a cyclone heat recovery device 5, a water-cooled drum 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 explosion-proof Spectacle valve 18, second metal hard-sealed butterfly valve 19, second explosion-proof glasses valve 20, third metal hard-sealed butterfly valve 21, third explosion-proof glasses valve 22, high temperature resistant explosion-proof ultra-clean dust collector 23, silo pump 24, fine ash silo 25, cooling replacement fan 26, clean gas pipe 27, gas axial flow fan 28, muffler 29, recovery cup valve 30, gas washing and dehydrating device 31, venting cup valve 33, venting chimney 34, nitrogen ejector pipe 35 and 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 dust collector 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 dust collector 4 is provided with multiple baffles, which can increase the residence time of dusty converter gas in the banana bend dust collector 4 and improve the dust removal efficiency; a water-cooled drum 6 is provided at the bottom of the banana bend dust collector 4 to transport the captured coarse ash out;

[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-cooling drum 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 drum 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 drum 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 transports 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 control valve, which may be 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 control valve, which may be a second metal hard-sealed butterfly valve 19 and a second explosion-proof glasses valve 20;

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

[0043] The cylinder of the high temperature 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 or thermal insulation cotton 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 resistant explosion-proof ultra-clean dust collector 23. The clean gas is sent to the gas switching station after passing through the gas axial flow fan 28 and the muffler 29. The qualified gas passes through the recovery cup valve 30, is washed and cooled by the gas cooling dehydrator 31, and is sent to the gas cabinet 32; the unqualified gas passes through the release cup valve 33 and is sent to the release chimney 34 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 venting chimney 34 is provided with a nitrogen ejector pipe 35 and a purge pipe 36. 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 system safety. 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 backfired.

[0049] The high-temperature resistant explosion-proof ultra-clean dust collector 23 is used in combination of more than two, and the specific number can be 3, 4, 5, 6 or more. It is set according to actual needs. Each dust collector forms a parallel working mode. The air outlet of each dust collector is connected to the clean gas pipe 27, and the ash outlet of each dust collector is transported to the fine ash bin 25 through the ash collecting pipe and the bin pump 24. Each dust collector is provided with an explosion relief valve, a vibrator, a heating coil and an insulation structure. Each high-temperature resistant explosion-proof ultra-clean dust collector is connected to the cooling replacement fan 26 through a pipeline.

[0050] The process flow of the ultra-clean converter gas dry dust removal system of the present invention is as follows:

[0051] Converter 1→vaporization cooling flue 2→high-efficiency heat exchanger 3→banana bend dust collector 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→recovery cup valve 30 / discharge cup valve 33→gas cooling dehydrator 31 / discharge chimney 34→gas cabinet 32.

[0052] 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 dust collector 4.

[0053] When the dusty waste gas passes through the banana bend dust collector 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 dust collector 4 and falls into the water-cooled drum 6.

[0054] The water-cooling drum 6 is arranged horizontally, is process-linked with the converter 1, and operates periodically during the smelting period.

[0055] Under normal circumstances, the coarse ash collected by the water-cooled drum 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.

[0056] When the bucket elevator 10 is under maintenance, the coarse ash collected by the water-cooled drum 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.

[0057] 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℃.

[0058] Qualified converter gas enters the gas washing and dehydrating device 31, and after being cooled by saturated water spraying, the temperature drops from 150°C to below 70°C, so that the gas tank 32 can store more converter gas.

[0059] The baffle of the banana bend dust collector 4 in the system of the present invention can be used in combination of two or more layers. The cylinder diameter of the high temperature resistant explosion-proof ultra-clean dust collector 23 is 1.0-10m, and can be used in combination of two or more. The filter material of the high temperature resistant explosion-proof ultra-clean dust collector 23 is stainless steel, FROMEX or P84; or the filter material of the high temperature resistant explosion-proof ultra-clean dust collector includes aramid ≥20% and aramid ≥20% and stainless steel conductive fiber content ≥6%, or anti-static glass fiber coated filter material, and the stainless steel conductive fiber content ≥6%. The dust concentration at the outlet of the high temperature resistant explosion-proof ultra-clean dust collector 23 is ≤5mg / Nm 3The pressure of the medium-pressure nitrogen delivered by the nitrogen ejector pipe 35 is ≥1.2MPa. The delivery medium of the purge pipe 36 is low-pressure nitrogen or saturated steam, and the pressure of the low-pressure nitrogen or saturated steam is ≥0.6MPa.

[0060] By constructing and implementing the system of the present invention, not only the problem of high-quality heat not being recovered is solved, but also the difficult problem of excessive emissions from the vent chimney caused by the maintenance of the electrostatic precipitator is solved, and the problem of large fluctuations in emission concentration at the outlet of the vent chimney is solved. The system is particularly suitable for the dry dust removal renovation project of the primary flue gas of the converter and has broad application prospects.

[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 gas dry dust removal system, characterized in that: Including high-efficiency heat exchanger, banana bend dust collector, cyclone heat recovery device, water-cooled drum, electrostatic dust collector, high-temperature explosion-proof ultra-clean dust collector, cooling replacement fan, clean gas pipe, gas axial flow fan, muffler, gas washing dehydrator; The converter and the high-efficiency heat exchanger are connected through a vaporization cooling flue. A banana-bend dust collector is provided between the high-efficiency heat exchanger and the cyclone heat recovery device. A water-cooling drum is provided at the bottom of the banana-bend dust collector to capture coarse ash. The water-cooling drum and the converter are interlocked and run periodically during smelting. The output end of the cyclone heat recovery device is connected to the electrostatic dust collector and the high-temperature explosion-proof ultra-clean dust collector through a raw gas pipe for fine dust removal. The high-temperature explosion-proof ultra-clean dust collector is connected to a cooling replacement fan. A clean gas pipe is provided at the outlet of the high-temperature explosion-proof ultra-clean dust collector. The clean gas passes through a gas axial flow fan and a muffler and is sent to a gas switching station. The qualified gas is washed and cooled by the gas cooling and dehydrating device and then sent to the gas cabinet; The unqualified gas is sent to the vent chimney and ignited and released.

2. The ultra-clean converter gas dry dust removal system according to claim 1, characterized in that: The inlet main pipe of the electrostatic precipitator is provided with a first control valve, and the outlet main pipe is provided with a second control valve; The third control valve is set on the inlet main pipe of the high temperature resistant explosion-proof ultra-clean dust collector; The outlet main pipe of the electrostatic precipitator is connected with the inlet of the high-temperature resistant explosion-proof ultra-clean precipitator.

3. The ultra-clean converter gas dry dust removal system according to claim 1, characterized in that: The high temperature resistant explosion-proof ultra-clean dust collectors are used in combination of more than two. The air 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. Each high temperature resistant explosion-proof ultra-clean dust collector is connected to the cooling replacement fan through a pipeline.

4. An ultra-clean converter gas dry dust removal system according to any one of claims 1 to 3, characterized in that: The cylinder diameter of the high temperature explosion-proof ultra-clean dust collector is 1.0 to 10m. The filter material of the high temperature explosion-proof ultra-clean dust collector is stainless steel, FEMES or P84; or The filter materials of high temperature resistant explosion-proof ultra-clean dust collector include aramid ≥20% and aramid ≥20% or anti-static glass fiber coated filter materials, and the content of stainless steel conductive fiber filaments is ≥6%.

5. The ultra-clean converter gas dry dust removal system according to claim 1, characterized in that: The outlet temperature of the vaporization cooling flue is 750℃~850℃. The raw gas passes through the high-efficiency heat exchanger, banana bend dust collector and cyclone heat recovery device in turn. After the high-efficiency heat exchange between gas and water in the high-efficiency 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. There are multiple baffles in the banana bend dust collector. The axial extension lines of the inlet and outlet of the banana bend dust collector have an angle that makes the airflow direction turn 180° and enter the cyclone heat recovery device. The cyclone heat recovery device is equipped with a cyclone device and a heat recovery device. After the cyclone, the raw gas can effectively separate coarse dust particles and enhance heat exchange, which is beneficial to heat recovery.

6. The ultra-clean converter gas dry dust removal system according to claim 1, characterized in that: The water-cooled drum ash discharge pipe 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 drum normally discharges ash to the intermediate ash bin through the pneumatic three-way discharge valve, the normal pneumatic double-layer flap valve and the bucket elevator, and the intermediate ash bin is fed into the converter; The water-cooled drum discharges ash to the coarse ash silo through the pneumatic three-way unloading valve and the emergency pneumatic double-layer flap valve. The coarse ash silo is transported out of the coarse ash through the vacuum suction vehicle or pneumatically transported to the intermediate ash silo through the silo pump.

7. The ultra-clean converter gas dry dust removal system according to claim 1, characterized in that: The pipelines in the gas switching station are equipped with recovery cup valves and venting cup valves. The qualified gas that has been tested passes through the recovery cup valve, is washed and cooled by the gas cooling dehydrator, and then is sent to the gas tank. The qualified converter gas enters the gas washing dehydrator, and after being cooled by saturated water spray, the temperature drops to below 70°C; the unqualified gas is sent to the venting chimney through the venting cup valve for ignition and release.

8. The ultra-clean converter gas dry dust removal system according to claim 1, 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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