Third-generation converter gas dry dedusting system

Abstract

The utility model relates to a third-generation converter gas dry dust removal system which comprises a high-effect heat exchanger, a banana bend dust remover, a rotational flow heat recovery device, a water cooling roller, a raw gas pipe, a high-temperature-resistant explosion-proof ultra-clean dust remover, a fine ash bin, a clean gas pipe, a gas axial flow fan and a gas cooling dehydrator, a banana bend dust remover is arranged between the high-effect heat exchanger and the rotational flow heat recovery device, and the rotational flow heat recovery device is connected with the high-temperature-resistant explosion-proof ultra-clean dust remover through a raw gas pipe. A clean gas pipe is arranged at an outlet of the high-temperature-resistant explosion-proof ultra-clean dust remover, clean gas is conveyed to a gas switching station through a gas axial flow fan, and the gas which is detected to be qualified is conveyed to a gas cabinet after being washed and cooled through a gas cooling dehydrator; unqualified coal gas is sent to a diffusion chimney to be ignited and diffused. The device not only solves the problem that high-quality heat is not recovered, but also solves the problem that a dry dust removal system is easy to vent explosion, and has a wide application prospect.

Description

TECHNICAL FIELD

[0001] The utility model discloses a third generation converter gas dry dedusting system belongs to environmental protection dust removal equipment technical field. BACKGROUND

[0002] With the environmental protection requirement of steel enterprise creation A demand and ultra -low emission, the converter of new building and reconstruction mostly adopts dry dedusting system. The current common dry dedusting system mainly has the first generation converter gas dry dedusting system LT method and DDS method and the improved second generation converter gas dry dedusting system, including the setting of the following of the electrostatic precipitator: coal cold preposition, double coal cold, coal cold + metal filter cartridge, wet type electric dust collector etc.

[0003] The main problems of the existing converter gas dry dedusting system are: first, through the water spray cooling of evaporative cooler, from 900 DEG C directly to 250 DEG C or so, this part of high quality heat is wasted, and is not recycled. Second, the electrostatic precipitator is used, and the high-voltage power supply is discharged continuously. Once the mixed gas components in the electrostatic precipitator reach the explosion limit, it is easy to produce explosion, which can damage the equipment in the system and affect the dust removal effect. In addition, the discharge degree of the high-voltage power supply is different, which can cause large fluctuation of voltage and current between the polar line and the polar plate, resulting in that the dust removal efficiency of the electrostatic precipitator is affected, and the dust emission concentration of the diffusion chimney outlet fluctuates greatly. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiency of the prior art, the utility model provides a third generation converter gas dry dedusting system.

[0005] In order to achieve the above purpose, the utility model is realized through the following technical schemes:

[0006] A third generation converter gas dry dedusting system, including high efficiency heat exchanger, banana bend dust collector, cyclone heat recovery device, water-cooled drum, raw coal gas pipe, high temperature explosion-proof ultra-clean dust collector, fine ash bin, clean coal gas pipe, coal gas axial flow fan, coal gas cooling dehydrator;

[0007] The inlet of the high efficiency heat exchanger is connected with the converter through the vaporization cooling flue, the raw coal gas of the converter enters the high efficiency heat exchanger to exchange heat and recover, the banana bend dust collector is arranged between the high efficiency heat exchanger and the cyclone heat recovery device, the water-cooled drum is arranged at the bottom of the banana bend dust collector, and the water-cooled drum is used for capturing and conveying coarse ash;

[0008] The cyclone heat recovery device is connected with the high temperature explosion-proof ultra-clean dust collector through the raw coal gas pipe, the clean coal gas is formed at the gas outlet of the high temperature explosion-proof ultra-clean dust collector, and the fine ash is pneumatically transported into the fine ash bin through the bin pump at the ash outlet of the high temperature explosion-proof ultra-clean dust collector;

[0009] The outlet of the high-temperature-resistant explosion-proof super-clean dust collector is connected with a clean gas pipe, clean gas is sent to a gas switching station by a gas axial flow fan, and qualified gas is sent to a gas tank after being washed and cooled by a gas cooling dehydrator; unqualified gas is sent to a dispersing chimney for ignition and dispersion.

[0010] Further, the outlet temperature of the vaporization cooling flue is 750-850℃, and after the high-efficiency heat exchange of the gas-water high-efficiency heat exchanger, the high-quality heat in the raw coal gas is efficiently recovered, and the temperature is reduced to 600℃ to enter the banana bend dust collector, which is provided with multiple baffles, and the inlet and outlet of the banana bend dust collector have an included angle to make the airflow direction change by 180°.

[0011] Further, the water-cooled roller is connected with a dust discharging pipe, which is provided with a pneumatic three-way discharge valve, a normal pneumatic double flap valve and an emergency pneumatic double flap valve.

[0012] The water-cooled roller is normally discharged to an intermediate ash bin through the pneumatic three-way discharge valve, the normal pneumatic double flap valve and a bucket elevator, and the intermediate ash bin is fed to a converter.

[0013] The water-cooled roller is emergently discharged to a coarse ash bin through the pneumatic three-way discharge valve and the emergency pneumatic double flap valve, and the coarse ash bin is externally transported with coarse ash by a vacuum suction truck or pneumatically transported to the intermediate ash bin by a bin pump.

[0014] Further, the cyclone heat recovery device is provided with a cyclone device and a heat recovery device, and the raw coal gas can be effectively separated from coarse particles and dust after cyclone, and the heat exchange is enhanced, the outlet of the cyclone heat recovery device is connected with a raw coal gas pipe, the side wall of the raw coal gas pipe is connected with a nitrogen dilution pipe, and the nitrogen dilution pipe is provided with a pneumatic cut-off valve.

[0015] Further, the high-temperature-resistant explosion-proof super-clean dust collector can be used in combination of two or more, the inlets of the dust collectors are connected with raw coal gas pipes, the outlets of the dust collectors are connected with clean gas pipes, the ash outlets of the dust collectors are connected with ash collecting pipes to transport fine ash to a fine ash bin, each dust collector is provided with an explosion 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 with a cooling replacement fan through a pipeline.

[0016] Further, a silencer is arranged on the pipeline between the gas axial flow fan and the gas switching station, a recovery cup valve is arranged on the pipeline of the qualified gas output by the gas switching station, and a dispersing cup valve is arranged on the pipeline of the unqualified gas output by the gas switching station.

[0017] Further, the dispersing chimney is provided with a nitrogen injection pipe and a blowing pipe on one side, the medium transported by the nitrogen injection pipe is medium-pressure nitrogen with a pressure of ≥1.2MPa, and the medium transported by the blowing pipe is low-pressure nitrogen or saturated steam with a pressure of ≥0.6MPa.

[0018] The third generation converter gas dry dedusting system has the following beneficial effects:

[0019] 1. The utility model discloses cancel the traditional evaporation cold water spray, solve the stubborn disease of easy scale of evaporation cold, converter gas waste heat full recovery, ton of steel steam recovery amount increases 50kg or more, and the system is more energy-saving.

[0020] 2. The utility model discloses cancel the traditional electrostatic precipitator process, adopt high temperature explosion -proof super clean dust catcher process after, solve the system leak -off explosion problem caused by the equipment frequent discharge, and the system is more safe, and the high temperature explosion -proof super clean dust catcher export concentration can maintain stable 5mg / Nm 3 Below, the system is more environmental protection.

[0021] 3. The utility model not only solves the problem that high quality heat is not recovered, also solves the difficult problem that dry dedusting system is easy to leak -off, also solves the problem that the emission concentration of the emission chimney outlet is greatly fluctuated, is suitable for converter primary flue gas dry dedusting project, and the application prospect is broad. DRAWINGS

[0022] The utility model will be further described below in combination with the drawings and examples, and the drawings are as follows:

[0023] Figure 1 It is the structural schematic diagram of the third generation converter gas dry dedusting system of the utility model.

[0024] Figure 2 It is Figure 1 The local partial A of the third generation converter gas dry dedusting system of the utility model.

[0025] Figure 3 It is Figure 1 The local partial B of the third generation converter gas dry dedusting system of the utility model and the connection schematic diagram of fine ash bin and cooling replacement fan.

[0026] Figure 4 It is Figure 1 The local partial C of the third generation converter gas dry dedusting system of the utility model. SPECIFIC IMPLEMENTATION

[0027] The utility model will be further described below in combination with the drawings:

[0028] Example: please refer to Figures 1 to 4The third generation converter gas dry dedusting system comprises a high-efficiency heat exchanger 3, a banana bend dust collector 4, a cyclone heat recovery device 5, a water-cooled roller 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 nitrogen dilution pipe 15, a pneumatic switch valve 16, a raw gas pipe 17, a high-temperature-resistant anti-explosion ultra-clean dust collector 18, a rapping device 19, a heating coil pipe 20, a pressure relief valve 21, a heat preservation structure 22, a bin pump 23, a pneumatic conveying pipeline, namely, an ash collecting pipe 24, a fine ash bin 25, a cooling replacement fan 26, a clean gas pipe 27, a gas axial flow fan 28, a silencer 29, a recovery cup valve 30, a gas cooling dehydrator 31, a diffusion cup valve 33, a diffusion chimney 34, a nitrogen injection pipe 35 and a blowing pipe 36; the outlet of the converter 1 is connected with the vaporization cooling flue 2, and the converter is defined as a decarburization converter, a dephosphorization converter, a vanadium extraction converter, a lava homogenizing furnace or a stainless steel converter;

[0029] The converter 1 is connected with the high-efficiency heat exchanger 3 through the vaporization cooling flue 2, and the banana bend dust collector 4 is arranged between the high-efficiency heat exchanger 3 and the cyclone heat recovery device 5; the high-efficiency heat exchanger 3 is internally provided with heat exchange dense pipes, high-quality heat in converter gas is taken away through heat exchange, and thus the temperature of the converter gas is reduced;

[0030] The banana bend dust collector 4 is internally provided with multiple layers of baffles, the residence time of dust-containing converter gas in the banana bend dust collector 4 can be increased, and the dust removal efficiency is improved; the water-cooled roller 6 is arranged at the bottom of the banana bend dust collector 4, and the captured coarse ash is discharged; the axial extension lines of the inlet and the outlet of the banana bend dust collector have an included angle, so that the airflow direction is turned by 180°, and the included angle is less than 60 degrees; the material of the banana bend dust collector 4 is stainless steel or boiler steel or Q345R; the baffles of the banana bend dust collector 4 can be used in two layers or multiple layers in combination;

[0031] The cyclone device and the heat recovery device are arranged in the cyclone heat recovery device 5; after the raw gas is subjected to cyclone, coarse particle dust can be effectively separated, and heat exchange is strengthened, which is beneficial to heat recovery;

[0032] The pneumatic three-way discharge valve 7, the normal pneumatic double-layer flap valve 8 and the emergency pneumatic double-layer flap valve 12 are arranged on the ash discharge pipe of the water-cooled roller 6;

[0033] The water-cooled roller 6 is normally discharged 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 is fed to the converter 1;

[0034] The water-cooled roller 6 is emergently discharged to the coarse ash bin 14 through the pneumatic three-way discharge valve 7 and the emergency pneumatic double-layer flap valve 12, and the coarse ash bin 14 pneumatically conveys the coarse ash to the intermediate ash bin 11 through the bin pump or by the vacuum suction truck;

[0035] The cyclone heat recovery device 5 and the high-temperature-resistant explosion-proof super-clean dust collector 18 are connected through the raw coal gas pipe 17.

[0036] The high-temperature-resistant explosion-proof super-clean dust collector 18 is provided with an explosion venting valve 21, a rapping device 19, a heating coil 20 and a heat preservation structure 22, which can be a heat preservation layer made of heat preservation material.

[0037] The high-temperature-resistant explosion-proof super-clean dust collector 18 is provided with a cooling replacement fan 26; once the dust collector is overhauled, after the coal gas is replaced by nitrogen, the cooling replacement fan 26 is started to blow air into the dust collector cylinder, thereby playing a role of cooling and ventilation.

[0038] The high-temperature-resistant explosion-proof super-clean dust collector 18 is provided with a cooling replacement fan 26; once the dust collector is overhauled, after the coal gas is replaced by nitrogen, the cooling replacement fan 26 is started to blow air into the dust collector cylinder, thereby playing a role of cooling and ventilation.

[0039] The high-temperature-resistant explosion-proof super-clean dust collector 18 is provided with a cooling replacement fan 26; once the dust collector is overhauled, after the coal gas is replaced by nitrogen, the cooling replacement fan 26 is started to blow air into the dust collector cylinder, thereby playing a role of cooling and ventilation.

[0040] The nitrogen dilution pipe 15 is provided with a pneumatic cut-off valve 16.

[0041] The nitrogen dilution pipe 15 is provided with a pneumatic cut-off valve 16.

[0042] The process flow of the third-generation converter gas dry dedusting system in the utility model is as follows:

[0043] Converter 1→ vaporization cooling flue 2→ high-efficiency heat exchanger 3→ banana bend dust collector 4→ cyclone heat recovery device 5→ raw coal gas pipe 17→ high-temperature-resistant explosion-proof super-clean dust collector 18→ clean coal gas pipe 27→ coal gas axial flow fan 28→ silencer 29→ recovery cup valve 30 / dispersion cup valve 33→ coal gas cooling dehydrator 31 / dispersion chimney 34→ coal gas tank 32.

[0044] In an embodiment of the utility model, the outlet temperature of the reinforced vaporization cooling flue 2 is 750-850 DEG C (generally 800 DEG C), after the raw coal gas is subjected to high-efficiency heat exchange of the high-efficiency heat exchanger 3, the high-quality heat in the raw coal gas is recovered with high efficiency, and the temperature is reduced to 600 DEG C and enters the banana bend dust collector 4.

[0045] When the dust-containing raw coal gas passes through the banana bend dust collector 4, it first passes through a plurality of baffle plates and collides, and due to the flow direction change of 180 degrees, 35% to 45% (generally 40%) of coarse particle dust is captured in the banana bend dust collector 4 under the action of gravity and centrifugal force and falls into the water-cooled roller 6.

[0046] 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.

[0047] Normally, the coarse ash collected by the water-cooled roller 6 in the utility model is discharged into the bucket elevator 10 through the normal ash discharge pipe 9 by the pneumatic three-way discharge valve 7 and the normal pneumatic double-layer flap valve 8, and then is discharged into the intermediate ash bin 11 by the bucket elevator 10; the intermediate ash bin 11 can store the coarse ash of at most two converters 1.

[0048] When the bucket elevator 10 is under maintenance, the coarse ash collected by the water-cooled roller 6 is discharged into the coarse ash bin 14 through the emergency ash discharge pipe 13 by the emergency pneumatic double-layer flap valve 12 and the pneumatic three-way discharge valve 7, and then is transported to the intermediate ash bin 11 by the coarse ash bin 14 through the vacuum suction truck or the bin pump.

[0049] The explosion vent 21 on the high-temperature explosion-proof super-clean dust collector 18 is provided with three-stage explosion venting, and once the pressure in the high-temperature explosion-proof super-clean dust collector 18 exceeds 6500 Pa, the explosion vent 21 is opened to release pressure, so as to protect the safety of the equipment and system; once the temperature in the dust collector is lower than 100 DEG C, the heating coil 20 works to heat to 120 DEG C and then stops working.

[0050] The qualified converter gas enters the gas cooling and dehydrating device 31, and after being cooled by saturated water spraying, the temperature is reduced from 150 DEG C to below 70 DEG C, so that the gas tank 32 can store more converter gas.

[0051] In the embodiment of the utility model, during the initial blowing of the converter and after the second lance lowering, the pneumatic cut-off valve 16 is opened, the nitrogen dilution pipe 15 sprays nitrogen for 30S, which is used to dilute the converter gas in the raw coal gas pipe 17 and prevent the content of the converter gas and oxygen from reaching the explosion limit.

[0052] In the embodiment of the utility model, 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.

[0053] When the converter gas is recovered by diffusion cutting, the pneumatic cut-off valve on the purging pipe 36 is opened, nitrogen or steam is purged for 30S, and the diffusion chimney 34 is prevented from being reheated.

[0054] In the embodiment of the utility model, the diameter of the cylinder of the high-temperature-resistant and explosion-proof super-clean dust collector 18 is 1.0-10 m, and two or more can be combined and used in parallel, the inlets of the dust collectors are connected with the raw coal gas pipes, the gas outlets of the dust collectors are connected with the clean coal gas pipes, and the ash outlets of the dust collectors are connected with the ash collection pipes to deliver the fine ash into the fine ash bin; the filter material of the high-temperature-resistant and explosion-proof super-clean dust collector 18 is stainless steel, fluorine or P84, 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%; the dust concentration at the outlet of the high-temperature-resistant and explosion-proof super-clean dust collector 18 is ≤5 mg / Nm 3 The third generation converter gas dry dust removal system is suitable for 50t-400t converters.

[0055] The above description is only an embodiment of the application, and any modification or change made by those skilled in the art based on the application is within the scope of the application, and is not limited to the embodiments disclosed.

Claims

1. A third generation dry dusting system for converter gas, characterized in that: The high-efficiency heat exchanger, the banana bend dust collector, the cyclone heat recovery device, the water-cooled drum, the raw gas pipe, the high-temperature-resistant explosion-proof super-clean dust collector, the fine ash bin, the clean gas pipe, the gas axial flow fan and the gas cooling dehydrator are arranged. The inlet of the high-efficiency heat exchanger is connected with the converter through the vaporization cooling flue, the raw gas of the converter is introduced into the high-efficiency heat exchanger to exchange heat and recover, the banana bend dust collector is arranged between the high-efficiency heat exchanger and the cyclone heat recovery device, the water-cooled drum is arranged at the bottom of the banana bend dust collector, and the water-cooled drum is used for collecting and conveying the coarse ash. The cyclone heat recovery device is connected with the high-temperature-resistant explosion-proof super-clean dust collector through the raw gas pipe, the outlet of the high-temperature-resistant explosion-proof super-clean dust collector forms clean gas, the outlet of the high-temperature-resistant explosion-proof super-clean dust collector is connected with the fine ash bin through the bin pump, and the fine ash is conveyed into the fine ash bin through gas force. The outlet of the high-temperature-resistant explosion-proof super-clean dust collector is connected with the clean gas pipe, the clean gas is sent to the gas switching station through the gas axial flow fan, the qualified gas is washed and cooled through the gas cooling dehydrator and then is sent to the gas tank, and the unqualified gas is sent to the diffusion chimney to be ignited and diffused.

2. The third generation dry dusting system of converter gas according to claim 1, characterized in that: The outlet temperature of the vaporization cooling flue is 750-850 DEG C, after the raw gas is introduced into the high-efficiency heat exchanger to exchange heat and recover, the high-quality heat in the raw gas is recovered efficiently, the temperature is reduced to 600 DEG C and the raw gas is introduced into the banana bend dust collector, and the banana bend dust collector is provided with a plurality of baffle plates.

3. The third generation dry dusting system of converter gas as claimed in claim 1 wherein: The inlet and outlet of the banana bend dust collector are axially extended and have an included angle, so that the gas flow direction is turned by 180 DEG.

4. The third generation dry dusting system of the converter gas according to one of claims 1 to 3, characterized in that: The water-cooled drum is connected with the ash discharge pipe, the ash discharge pipe is provided 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 is connected with the ash discharge pipe, the ash discharge pipe is provided 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 is connected with the ash discharge pipe, the ash discharge pipe is provided with a pneumatic three-way discharge valve, a normal pneumatic double-layer flap valve and an emergency pneumatic double-layer flap valve.

5. The third generation dry dusting system of converter gas as claimed in claim 1 wherein: The water-cooled drum is connected with the ash discharge pipe, the ash discharge pipe is provided with a pneumatic three-way discharge valve, a normal pneumatic double-layer flap valve and an emergency pneumatic double-layer flap valve.

6. The third generation dry dusting system of converter gas according to claim 1 or 5, characterized in that: The cyclone heat recovery device is provided with a cyclone device and a heat recovery device, the raw gas is separated from coarse particles and dust after being introduced into the cyclone heat recovery device, the heat exchange is enhanced, and the outlet of the cyclone heat recovery device is connected with the raw gas pipe.

7. The third generation dry dusting system of converter gas as claimed in claim 1 wherein: The side wall of the raw gas pipe is connected with the nitrogen dilution pipe, and the nitrogen dilution pipe is provided with a pneumatic cut-off valve.

8. The third generation dry dusting system of converter gas according to claim 1 or 7, characterized in that: The high-temperature-resistant explosion-proof super-clean dust collector can be combined with two or more, the inlets of the dust collectors are connected with the raw gas pipe, the outlets of the dust collectors are connected with the clean gas pipe, the ash outlets of the dust collectors are connected with the fine ash bin through the ash collecting pipe, the dust collectors are provided with explosion relief valves, and the high-temperature-resistant explosion-proof super-clean dust collectors are connected with the cooling replacement fan through the pipeline.

9. The third generation dry dusting system of converter gas as claimed in claim 1 wherein: One side of the high-temperature-resistant explosion-proof super-clean dust collector is provided with a rapping device, and the dust collector is provided with a heating coil.

10. The third generation dry dusting system of the converter gas as claimed in claim 1 or 2 or 3 or 5 or 7 or 9 wherein: A silencer is arranged on the pipeline between the gas axial flow fan and the gas switching station, a recovery cup valve is arranged on the pipeline of the qualified gas output by the gas switching station, and a diffusion cup valve is arranged on the pipeline of the unqualified gas output by the gas switching station. One side of the diffusion chimney is provided with a nitrogen injection pipe and a blowing pipe, the medium transported by the nitrogen injection pipe is medium-pressure nitrogen with a pressure of greater than or equal to 1.2 MPa, and the medium transported by the blowing pipe is low-pressure nitrogen or saturated steam with a pressure of greater than or equal to 0.6 MPa.

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