Dry dust removal system for ultra-clean converter gas

Abstract

The utility model 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. According to the utility model, the traditional evaporation cold spray water is canceled, 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 utility model discloses a kind of ultra-clean converter gas dry method dust removal systems, it is related to environmental protection equipment field, more specifically related to converter gas dry method dust removal system. BACKGROUND

[0002] With the environmental protection requirement of steel enterprise creation A demand and ultra-low emission, newly built and reconstructed converter mostly adopt dry dedusting system. The currently common dry dedusting system mainly has first generation converter primary dry dedusting system (LT method and DDS method) and improved second generation converter primary dry dedusting system (electrostatic precipitator is set behind: coal cold front, double coal cold, coal cold+metal filter cartridge, wet type electric dust collector etc.).

[0003] The main problems of existing converter primary dry dedusting system are as follows: first, water mist cooling is carried out through evaporative cooler, and temperature is directly reduced from 900 DEG C to about 250 DEG C, and this part of high-quality heat is wasted without recycling. Second, electrostatic precipitator process is adopted, and when electrostatic precipitator is overhauled, the phenomenon of smoke from diffusion chimney will be caused. In addition, due to different discharging degrees of high-voltage power supply, the voltage and current between pole line and pole plate will fluctuate greatly, which will affect the dust removal efficiency of electrostatic precipitator, and the dust emission concentration of diffusion chimney outlet will fluctuate greatly.

[0004] Chinese document CN110184411A relates to converter primary flue gas high-efficiency energy-saving ultra-clean emission full dry dedusting system, converter is connected with heat pipe waste heat boiler through vaporization cooling flue, vaporization cooling flue and heat pipe waste heat boiler are connected with waste heat water vapor system, heat pipe waste heat boiler is sequentially connected with multi-tube type anti-explosion and combustion fire barrier, pulse bag-type dust collector, fan, switching station and chimney through flue gas pipeline, switching station is also connected with gas holder, heat pipe waste heat boiler, multi-tube type anti-explosion and combustion fire barrier and pulse bag-type dust collector are all connected with pneumatic ash conveying system. In the scheme, converter flue gas is cooled in heat pipe waste heat boiler, and then the outlet flue gas temperature of multi-tube type anti-explosion and combustion fire barrier needs to be stabilized in the tolerance range of bag-type dust collector. If the temperature is too high, the filter bag is easy to burn out. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides a kind of ultra-clean converter gas dry method dust removal system, with energy-saving and environmental protection advantages.

[0006] To achieve the above purpose, the utility model is realized by the following technical solutions:

[0007] An ultra-clean converter gas dry method 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 precipitator, 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, a coal gas washing dehydrator.

[0008] The converter and the high-efficiency heat exchanger are connected by a vaporization cooling flue, a banana bend dust collector is arranged between the high-efficiency heat exchanger and the cyclone heat recovery device, a water-cooled roller is arranged at the bottom of the banana bend dust collector to collect coarse ash, the water-cooled roller is connected with the converter and is periodically operated during smelting, the output end of the cyclone heat recovery device is connected with an electrostatic precipitator and a high-temperature explosion-proof ultra-clean dust collector through a raw coal gas pipe to perform fine dust removal, the high-temperature explosion-proof ultra-clean dust collector is connected with a cooling replacement fan, a clean coal gas pipe is arranged at the outlet of the high-temperature explosion-proof ultra-clean dust collector, and the clean coal gas is sent to a coal gas switching station after passing through a coal gas axial flow fan and a silencer.

[0009] The qualified coal gas is washed and cooled by a coal gas cooling dehydrator and then is sent to a coal gas tank.

[0010] The unqualified coal gas is sent to a diffusion chimney for ignition and diffusion.

[0011] Further, a first control valve is arranged at the inlet main pipe of the electrostatic precipitator, and a second control valve is arranged at the outlet main pipe of the electrostatic precipitator.

[0012] A third control valve is arranged at the inlet main pipe of the high-temperature explosion-proof ultra-clean dust collector.

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

[0014] Further, the high-temperature explosion-proof ultra-clean dust collector is used in combination of two or more, the gas outlets of the dust collectors are connected with clean coal gas pipes, the ash outlets of the dust collectors are connected with ash collecting pipes to send the ash to fine ash bins, each dust collector is provided with an explosion relief valve, a rapping device, a heating coil and a heat preservation structure, and the high-temperature explosion-proof ultra-clean dust collectors are connected with a cooling replacement fan through pipes.

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

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

[0017] Further, the outlet temperature of the vaporization cooling flue is 750-850℃, the raw coal gas sequentially passes through the high-efficiency heat exchanger, the banana bend dust collector and the cyclone heat recovery device, after the high-efficiency heat exchange of the high-efficiency heat exchanger, the high-quality heat in the raw coal gas is efficiently recovered, the temperature is reduced to 600℃ and enters the banana bend dust collector, a plurality of baffles are arranged in the banana bend dust collector, the inlet and outlet of the banana bend dust collector have an included angle to make the airflow direction change by 180° and enter the cyclone heat recovery device, a cyclone device and a heat recovery device are arranged in the cyclone heat recovery device, the raw coal gas can effectively separate coarse particle dust after the cyclone, and the heat exchange is strengthened, which is beneficial to heat recovery.

[0018] Further, the water-cooled roller is provided with a pneumatic three-way discharge valve, a normal pneumatic double flap valve and an emergency pneumatic double flap valve on the ash discharge pipe.

[0019] The water-cooled roller is normally discharged to the intermediate ash bin through the pneumatic three-way discharge valve, the normal pneumatic double flap valve and the bucket elevator, and the intermediate ash bin is fed to the converter.

[0020] The water-cooled roller is normally discharged to the intermediate ash bin through the pneumatic three-way discharge valve, the normal pneumatic double flap valve and the bucket elevator, and the intermediate ash bin is fed to the converter.

[0021] Further, the pipeline in the gas switching station is provided with a recovery cup valve and a dispersion cup valve, the qualified gas passes through the recovery cup valve, is washed and cooled by the gas cooling dehydrator, and is then sent to the gas tank, the qualified converter gas enters the gas washing dehydrator, is cooled by saturated water spraying, and the temperature is reduced to below 70 DEG C.

[0022] Further, the dispersion chimney is provided with a nitrogen injection pipe and a purge pipe on one side, the medium pressure nitrogen gas transported by the nitrogen injection pipe has a pressure of greater than or equal to 1.2 MPa, and the purge pipe transports low-pressure nitrogen gas or saturated steam, and the low-pressure nitrogen gas or saturated steam has a pressure of greater than or equal to 0.6 MPa.

[0023] The super-clean converter gas dry dedusting system of the utility model has the following beneficial effects:

[0024] 1. The utility model cancels the traditional evaporative cooling water spraying, solves the stubborn problem of easy scaling of evaporative cooling, recovers the converter gas waste heat, increases the steam recovery amount of ton steel by more than 50 kg, and the system is more energy-saving.

[0025] 2. After the high-temperature explosion-proof super-clean dust collector process is used, the outlet concentration of the high-temperature explosion-proof super-clean dust collector can be maintained at 5 mg / Nm 3 The system is more environmentally friendly. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of the super-clean converter gas dry dedusting system of the utility model.

[0027] Figure 2 It is Figure 1 A zoomed-in view of the middle.

[0028] Figure 3 It is Figure 1 A zoomed-in view of the middle B.

[0029] Figure 4 It is Figure 1 A zoomed-in view of the middle C. DETAILED DESCRIPTION

[0030] The utility model will be further explained in connection with the drawings:

[0031] Embodiment: please refer to Figures 1 to 4 A kind of ultra-clean converter gas dry method dust removal system, including high-efficiency heat exchanger 3, banana bend dust collector 4, cyclone heat recovery device 5, water-cooled drum 6, electrostatic precipitator 16, high-temperature explosion-proof ultra-clean dust collector 23, cooling replacement fan 26, clean gas pipe 27, gas axial flow fan 28, muffler 29, gas washing dehydrator 31;Converter 1 and the high-efficiency heat exchanger 3 are connected by vaporization cooling flue 2, high-efficiency heat exchanger 3 and cyclone heat recovery device 5 between being equipped with banana bend dust collector 4, the bottom of banana bend dust collector 4 is equipped with water-cooled drum 6 to capture coarse ash, water-cooled drum 6 and converter 1 interlock to run periodically during smelting, the output end of cyclone heat recovery device 5 is connected with electrostatic precipitator 26 and high-temperature explosion-proof ultra-clean dust collector 23 through raw gas pipe 15 and carries out fine dust removal operation, high-temperature explosion-proof ultra-clean dust collector 23 connects cooling replacement fan 26, the outlet of the high-temperature explosion-proof ultra-clean dust collector is provided with clean gas pipe 27, clean gas passes through gas axial flow fan 28 and muffler 29 and is sent to gas switching station;The gas that passes through gas cooling dehydrator 31 and is washed after cooling is sent to gas tank 32;Unqualified gas is sent to diffusion chimney 34 and is ignited and diffused.

[0032] The ultra-clean converter gas dry method dust removal system of the utility model is applicable to 50t~400t converter. Converter 1 is defined as: decarburization converter or dephosphorization converter or vanadium extraction converter or lava homogenizing furnace or stainless steel converter. The material of banana bend dust collector 4 is stainless steel or boiler steel or Q345R.

[0033] The ultra-clean converter gas dry method dust removal system of the utility model specifically includes high-efficiency heat exchanger 3, banana bend dust collector 4, cyclone heat recovery device 5, water-cooled drum 6, pneumatic tee joint unloading valve 7, normal pneumatic double-layer flap valve 8, normal ash removal pipe 9, bucket elevator 10, intermediate ash bin 11, emergency pneumatic double-layer flap valve 12, emergency ash removal pipe 13, coarse ash bin 14, raw gas pipe 15, electrostatic precipitator 16, first metal hard seal butterfly valve 17, first explosion-proof spectacle valve 18, second metal hard seal butterfly valve 19, second explosion-proof spectacle valve 20, third metal hard seal butterfly valve 21, third explosion-proof spectacle valve 22, high-temperature explosion-proof ultra-clean dust collector 23, bin pump 24, fine ash bin 25, cooling replacement fan 26, clean gas pipe 27, gas axial flow fan 28, muffler 29, recovery cup valve 30, gas washing dehydrator 31, diffusion cup valve 33, diffusion chimney 34, nitrogen injection pipe 35 and purge pipe 36.

[0034] Converter 1 and high efficiency heat exchanger 3 are connected by vaporization cooling flue 2, high efficiency heat exchanger 3 and cyclone heat recovery device 5 are provided with banana bend dust collector 4; high efficiency heat exchanger 3 is provided with heat exchange dense tube, high quality heat in converter gas is taken away through heat exchange, thereby reducing the temperature of converter gas;

[0035] Banana bend dust collector 4 is provided with multiple layers of baffles, which can increase the residence time of dust-containing converter gas in banana bend dust collector 4 and improve the dust removal efficiency; banana bend dust collector 4 is provided with water-cooled roller 6 at the bottom, which transports the captured coarse ash out;

[0036] Cyclone heat recovery device 5 is provided with cyclone device and heat recovery device; after cyclone, the raw gas can effectively separate coarse particle dust and strengthen heat exchange, which is beneficial to heat recovery.

[0037] Water-cooled roller 6 is provided with pneumatic three-way discharge valve 7, normal pneumatic double flap valve 8 and emergency pneumatic double flap valve 12 on the ash discharge pipe;

[0038] Water-cooled roller 6 is normally discharged to intermediate ash bin 11 through pneumatic three-way discharge valve 7, normal pneumatic double flap valve 8 and bucket elevator 10, and intermediate ash bin 11 is fed to converter 1;

[0039] Water-cooled roller 6 is emergently discharged to coarse ash bin 14 through pneumatic three-way discharge valve 7 and emergency pneumatic double flap valve 12, and coarse ash bin 14 is transported to intermediate ash bin 11 through vacuum suction truck or is air force transported to intermediate ash bin 11 through bin pump;

[0040] Cyclone heat recovery device 5 and electrostatic precipitator 16 are connected through raw gas pipe 15;

[0041] First control valve is arranged on the inlet main pipe of electrostatic precipitator 16, which can be first metal hard sealing butterfly valve 17 and first explosion-proof mirror valve 18; second control valve is arranged on the outlet main pipe, which can be second metal hard sealing butterfly valve 19 and second explosion-proof mirror valve 20;

[0042] Third control valve is arranged on the inlet main pipe of high-temperature explosion-proof ultra-clean dust collector 23, which can be third metal hard sealing butterfly valve 21 and third explosion-proof mirror valve 22;

[0043] High-temperature explosion-proof ultra-clean dust collector 23 is provided with explosion venting valve, rapping device, heating coil and heat preservation structure, which can be heat preservation layer or heat preservation cotton made of heat preservation material;

[0044] High-temperature explosion-proof ultra-clean dust collector 23 is provided with cooling replacement fan 26; once the dust collector is overhauled, after the gas is replaced by nitrogen, the cooling replacement fan 26 is started to blow air into the dust collector cylinder, which plays the role of cooling and ventilation;

[0045] The high-temperature-resistant explosion-proof super-clean dust collector 23 transports the collected fine ash to the fine ash bin 25 by the bin pump 24; the fine ash bin 25 is provided with a vacuum suction and discharge tank truck interface;

[0046] The high-temperature-resistant explosion-proof super-clean dust collector 23 is provided with a clean gas pipe 27 at the outlet, clean gas is sent to a gas switching station after passing through a gas axial flow fan 28 and a silencer 29, and the qualified gas after detection is sent to a gas tank 32 after passing through a recovery cup valve 30 and being washed and cooled by a gas cooling dehydrator 31; the unqualified gas is sent to a diffusing chimney 34 after passing through a diffusing cup valve 33 and being ignited and diffused;

[0047] The electrostatic precipitator 16 and the high-temperature-resistant explosion-proof super-clean dust collector 23 can work in series, or the high-temperature-resistant explosion-proof super-clean dust collector can work alone after the first metal hard-sealed butterfly valve 17, the first explosion-proof mirror valve 18, the second metal hard-sealed butterfly valve 19 and the second explosion-proof mirror valve 20 are closed and the third metal hard-sealed butterfly valve 21 and the third explosion-proof mirror valve 22 are opened. After the electrostatic precipitator and the high-temperature-resistant explosion-proof super-clean dust collector are combined, a dust removal device is added at the outlet of the electrostatic precipitator, the dust from the electrostatic precipitator is captured by the high-temperature-resistant explosion-proof super-clean dust collector, and thus the corresponding defects mentioned in the background art are overcome.

[0048] The diffusing chimney 34 is provided with a nitrogen injection pipe 35 and a blowing pipe 36. Once the system is powered off or the gas axial flow fan 28 fails, the pneumatic cut-off valve on the nitrogen injection pipe 35 is opened, nitrogen is injected for 15S, and the safety of the system is ensured. When the converter gas is diffused and recovered, the pneumatic cut-off valve on the blowing pipe 36 is opened, nitrogen or steam is blown for 30S, and the diffusing chimney 34 is prevented from being reheated.

[0049] The high-temperature-resistant explosion-proof super-clean dust collector 23 is used in combination with two or more, and the specific number can be 3, 4, 5, 6 or more, which is set according to actual needs. Each dust collector forms a parallel working mode, the gas outlets of each dust collector are connected to the clean gas pipe 27, the ash outlets of each dust collector are connected to the ash bin 25 through the ash collecting pipe and the bin pump 24, each dust collector is provided with a pressure relief valve, a rapping device, a heating coil and a heat preservation structure, and each high-temperature-resistant explosion-proof super-clean dust collector is connected to the cooling replacement fan 26 through a pipeline.

[0050] The process flow of the super-clean converter gas dry dust removal system in the utility model is as follows:

[0051] Converter 1→ vaporization and 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 super-clean dust collector 23→ clean gas pipe 27→ gas axial flow fan 28→ silencer 29→ recovery cup valve 30 / diffusing cup valve 33→ gas cooling dehydrator 31 / diffusing chimney 34→ gas tank 32.

[0052] The temperature of the outlet of the enhanced vaporization cooling flue 2 is 750-850℃ (usually 800℃), and after the high-efficiency heat exchanger 3, the high-quality heat in the raw coal gas is recovered, and the temperature is reduced to 600℃, and the raw coal gas enters the banana bend dust collector 4.

[0053] When the dust-containing raw coal gas passes through the banana bend dust collector 4, it first passes through multiple baffle collisions, and due to the flow direction change of 180°, 35%-45% (usually 40%) of the coarse particles and dust are captured in the banana bend dust collector 4 under the action of gravity and centrifugal force, and fall into the water-cooled roller 6.

[0054] The water-cooled roller 6 is horizontally arranged and is connected with the converter 1 in a process chain and is periodically operated during smelting.

[0055] Under normal circumstances, the coarse ash collected by the water-cooled roller 6 enters the normal ash discharge pipe 9 through the pneumatic three-way discharge valve 7 and the normal pneumatic double flap valve 8, and then is discharged to the intermediate ash bin 11 by the bucket elevator 10.

[0056] When the bucket elevator 10 is under maintenance, the coarse ash collected by the water-cooled roller 6 is discharged to the coarse ash bin 14 through the emergency ash discharge pipe 13 by the emergency pneumatic double flap valve 12, and then is discharged to the coarse ash bin 14.

[0057] The explosion vent of the high-temperature explosion-proof super-clean dust collector 23 is provided with three-stage explosion venting, and once the pressure in the high-temperature explosion-proof super-clean dust collector 23 exceeds 6500Pa, the explosion vent is opened to release pressure and protect the safety of the equipment and system; once the temperature in the dust collector is lower than 100℃, the heating coil works to heat to 120℃ and then stops working.

[0058] The qualified converter gas enters the gas washing and dewatering device 31, and after being cooled by saturated water spraying, the temperature is reduced from 150℃ to below 70℃, so that more converter gas can be stored in the gas tank 32.

[0059] The baffle of the banana bend dust collector 4 in the system can be used in two layers or multiple layers. The diameter of the cylinder of the high-temperature explosion-proof super-clean dust collector 23 is 1.0-10m, and two or more can be used in combination. The filter material of the high-temperature explosion-proof super-clean dust collector 23 is stainless steel, fluorine or P84; or the filter material of the high-temperature explosion-proof super-clean dust collector includes aramid fiber ≥20% and aramid fiber ≥20% and stainless steel conductive fiber silk content ≥6%, or anti-static glass fiber film filter material, and the stainless steel conductive fiber silk content is ≥6%. The dust concentration at the outlet of the high-temperature explosion-proof super-clean dust collector 23 is ≤5mg / Nm 3The medium transported by the nitrogen injection pipe 35 is medium-pressure nitrogen, and the pressure of the medium is greater than or equal to 1.2 MPa.

[0060] By constructing the system and implementing, the problem of high-quality heat not being recycled is solved, the problem of the emission of the dispersing chimney exceeding the standard caused by the maintenance of the electrostatic precipitator is solved, and the problem of the emission concentration of the dispersing chimney outlet fluctuating greatly is solved, and the system is especially suitable for a converter primary flue gas dry dedusting transformation project and has a wide application prospect.

[0061] The above description is only an embodiment of the application, and any modification or change made by those skilled in the art using the application is within the scope of the application, and is not limited to the embodiments disclosed.

Claims

1. An ultra-clean converter gas dry dedusting system, characterized in that: Efficient heat exchanger, banana bend dust collector, cyclone heat recovery device, water-cooled drum, electrostatic precipitator, high-temperature explosion-proof super-clean dust collector, cooling replacement fan, clean gas pipe, gas axial flow fan, silencer, coal gas washing dehydrator; The converter is connected with the high-efficiency heat exchanger through the vaporization cooling flue, the high-efficiency heat exchanger and the cyclone heat recovery device are provided with the banana bend dust collector, the bottom of the banana bend dust collector is provided with the water-cooled drum for capturing coarse ash, the water-cooled drum is connected with the converter and is periodically operated during smelting, the output end of the cyclone heat recovery device is connected with the electrostatic precipitator and the high-temperature explosion-proof super-clean dust collector through the raw coal gas pipe to perform fine dust removal operation, the high-temperature explosion-proof super-clean dust collector is connected with the cooling replacement fan, the outlet of the high-temperature explosion-proof super-clean dust collector is provided with the clean gas pipe, the clean gas is sent to the gas switching station after passing through the gas axial flow fan and the silencer; The qualified gas is sent to the gas tank after being washed and cooled by the coal gas cooling dehydrator. The unqualified gas is sent to the diffusion chimney for ignition and diffusion.

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

3. A dry dust removal system for ultra-clean converter gas according to claim 1, characterized in that: The high-temperature explosion-proof super-clean dust collector is used in combination of two or more, the gas outlets of the dust collectors are connected with the clean gas pipe, the ash outlets of the dust collectors are connected with the ash collecting pipe to send the ash to the fine ash bin, the dust collectors are provided with the explosion relief valve, the rapping device, the heating coil and the heat preservation structure, and the dust collectors are connected with the cooling replacement fan through the pipes.

4. A dry dust removal system for ultra-clean converter gas according to any one of claims 1 to 3, characterized in that: The diameter of the cylinder of the high-temperature explosion-proof super-clean dust collector is 1.0-10 m, the filter material of the high-temperature explosion-proof super-clean dust collector is stainless steel, fluorine or P84, or The filter material of the high-temperature explosion-proof super-clean dust collector comprises aramid fiber≥20% and aramid fiber≥20% or anti-static glass fiber membrane filter material, and the content of the stainless steel conductive fiber wire is≥6%.

5. A dry dust removal system for ultra-clean converter gas according to claim 1, characterized in that: The outlet temperature of the vaporization cooling flue is 750-850℃, the raw coal gas passes through the high-efficiency heat exchanger, the banana bend dust collector and the cyclone heat recovery device in sequence, after the high-efficiency heat exchange of the high-efficiency heat exchanger, the high-quality heat in the raw coal gas is efficiently recovered, the temperature is reduced to 600℃ and enters the banana bend dust collector, the banana bend dust collector is provided with multiple baffles, the inlet and the outlet of the banana bend dust collector are axially extended and have an included angle to make the airflow direction change by 180° to enter the cyclone heat recovery device, the cyclone heat recovery device is provided with the cyclone device and the heat recovery device, the raw coal gas can be effectively separated from the coarse particle dust after the cyclone, and the heat exchange is strengthened, which is beneficial to heat recovery.

6. A dry dust removal system for ultra-clean converter gas according to claim 1, characterized in that: The pneumatic three-way discharge valve, the normal pneumatic double flap valve and the emergency pneumatic double flap valve are arranged on the ash discharge pipe of the water-cooled drum. The water-cooled drum is normally discharged to the intermediate ash bin through the pneumatic three-way discharge valve, the normal pneumatic double flap valve and the bucket elevator, and the intermediate ash bin is fed to the converter. The water-cooled drum is emergently discharged to the coarse ash bin through the pneumatic three-way discharge valve, the emergency pneumatic double flap valve, the coarse ash bin is externally transported through the vacuum suction truck or is air-force transported to the intermediate ash bin through the bin pump.

7. A dry dust removal system for ultra-clean converter gas according to claim 1, characterized in that: The pipeline in the coal gas switching station is provided with a recovery cup valve and a diffusion cup valve. The qualified coal gas passes through the recovery cup valve, is washed and cooled by the coal gas cooling dehydrator, and is then sent to the coal gas tank. The qualified converter coal gas enters the coal gas washing dehydrator, is cooled by saturated water spraying, and the temperature is reduced to below 70 DEG C. The unqualified coal gas passes through the diffusion cup valve and is sent to the diffusion chimney for ignition and diffusion.

8. A dry dust removal system for ultra-clean converter gas according to claim 1, characterized in that: A nitrogen injection pipe and a blowing pipe are arranged on one side of the diffusion chimney. The medium transported by the nitrogen injection pipe is medium-pressure nitrogen with a pressure of ≥1.2 MPa. The medium transported by the blowing pipe is low-pressure nitrogen or saturated steam with a pressure of ≥0.6 MPa.

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