CN213977762U - Converter one-time dry dedusting diffusion flue gas ultralow emission purification treatment system - Google Patents
Converter one-time dry dedusting diffusion flue gas ultralow emission purification treatment system Download PDFInfo
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- CN213977762U CN213977762U CN202021129279.0U CN202021129279U CN213977762U CN 213977762 U CN213977762 U CN 213977762U CN 202021129279 U CN202021129279 U CN 202021129279U CN 213977762 U CN213977762 U CN 213977762U
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Abstract
The utility model relates to a flue gas field of handling, concretely relates to converter that possesses deflagration prevention and dewfall function once dry process dust removal diffuses flue gas minimum emission purification processing system. The system comprises an evaporative cooling tower, an electrostatic dust collector, a fan, a silencer and a switching station, wherein the evaporative cooling tower, the electrostatic dust collector, the fan, the silencer and the switching station are communicated with a converter, the switching station is respectively communicated with a gas cabinet and a cloth bag type dust collector, the cloth bag type dust collector is made of high-temperature-resistant anti-static filter materials, a cooling device and a spark catcher are arranged between the switching station and the cloth bag type dust collector, and the cooling device is arranged on a flue at the front end of the spark catcher.
Description
Technical Field
The utility model relates to a flue gas field of handling, concretely relates to converter is dust removal of dry process and is diffused flue gas minimum emission clean processing system once.
Background
In the steelmaking converter process in the metallurgical industry, flue gas generated after oxygen blown into a converter reacts with carbon in molten iron is discharged from a converter mouth, and the flue gas contains a large amount of CO gas, so the flue gas is also called converter gas or converter primary flue gas. The method for purifying the converter gas is mainly divided into a wet method and a dry method, wherein the dry method dust removal has the remarkable characteristics of advanced technology, low comprehensive operation cost, obvious water and electricity saving, higher dust removal effect and the like. The 1500 ℃ high-temperature flue gas discharged from the converter mouth of the converter is cooled to 900 ℃ through a vaporization cooling flue under the negative pressure action of a gas fan, then enters an evaporation cooling tower, is cooled and tempered under the action of water spraying and atomization, is directly cooled to about 250 ℃, simultaneously enables the properties of the flue gas to meet the requirements of an electrostatic dust collector, and settles and separates out coarse particle dust in the flue gas. And (3) the converter gas after temperature reduction and tempering enters an electrostatic dust collector through a gas pipeline, the flue gas is further purified under the action of an electrostatic field, and fine ash is separated from the flue gas. After the purified converter gas passes through the fan, the low-quality gas is directly diffused through the diffusion chimney, and the high-quality gas is cooled and washed by the gas washing and cooling tower and then enters the gas cabinet for storage.
The dry dedusting process needs to control the water spraying amount and the atomization effect in the evaporative cooling tower according to the actual conditions of each production stage, so that the cooling and dust conditioning effects of the converter gas can reach the best to meet the requirements of the electrostatic deduster, and the air volume of the dedusting system is accurately adjusted by an automatic means to be matched with the production process. However, in view of the actual operation effect of the currently put-into-use converter gas dry dedusting system, it is difficult to stably control parameters such as water injection amount, atomization effect and air volume for a long time, and problems such as pole line deformation and fracture of an electrostatic precipitator polar plate, dust deposition of an evaporative cooler, system explosion venting in actual operation and the like often occur, which easily causes that the emission of the dedusting system does not reach the standard.
SUMMERY OF THE UTILITY MODEL
The utility model provides a converter that possesses deflagration prevention and moisture condensation function once dry process removes dust and diffuses flue gas minimum emission purification processing system.
According to the utility model, the converter primary flue gas dry processing system comprises an evaporative cooling tower, an electrostatic dust collector, a fan, a silencer and a switching station which are communicated with the converter from the upstream to the downstream in sequence according to the flow direction of primary flue gas pumped from the converter;
the switching station is respectively communicated with a gas tank and a cloth bag type dust collector through pipelines, and the flue gas treated by the cloth bag type dust collector is discharged through a chimney;
the cloth bag type dust collector is made of high-temperature-resistant anti-static filter materials, and the main body of the dust collector is of a plurality of groups of cylindrical structures;
and a cooling device and a spark catcher are arranged between the switching station and the bag type dust collector, and the cooling device is arranged on a flue at the front end of the spark catcher.
According to the utility model discloses a flue gas dry processing system once of converter, wherein, cooling device is including setting up the multirow atomizing nozzle in flue gas pipeline, and nozzle upper reaches pipeline is including supplying steam conduit, water supply pipe, confession nitrogen pipe way.
According to the utility model discloses a flue gas dry processing system once of converter, wherein, water supply pipe is furnished with cover and is had emergent retaining jar, emergent retaining jar nitrogen valve group, intake and nitrogen inlet pipeline for the pressure boost.
According to the utility model discloses a flue gas dry processing system once of converter, wherein, be provided with on the barrel of spark catcher and bag collector and let out and explode the valve.
According to the utility model discloses a flue gas dry processing system once of converter, wherein, set up heat preservation device at spark catcher and bag collector's surface.
According to the converter primary flue gas dry processing system of the utility model, a flue gas pipeline, a spark catcher and a bag type dust collector which are arranged between a switching station and a diffusing chimney are respectively provided with a nitrogen gas replacement device,
according to the utility model discloses a flue gas dry processing system once of converter, wherein, the bottom of evaporative cooling tower is connected with thick ash bin.
According to the utility model discloses a flue gas dry processing system once of converter, wherein, bag collector's bottom is provided with pneumatic conveying system, with electrostatic precipitator's fine dust storehouse or independent ash storehouse intercommunication.
According to the utility model discloses a flue gas dry processing system once of converter, wherein, bag collector includes pulse deashing system and filtration system.
According to the utility model discloses a flue gas dry processing system once of converter, wherein, bag collector's filtration system includes the dust removal unit that the multiunit connects in parallel each other, every the dust removal unit includes barrel and ash bucket, and the shape of ash bucket is the infundibulate, and the air intake has been seted up to the barrel lower part, and the air outlet has been seted up at the top of barrel.
The utility model has the advantages that:
the utility model provides a converter primary flue gas diffuses ultra-low emission processing system of bag-type dust removal. The utility model discloses a converter flue gas dust pelletizing system that once removes dust is on the basis that converter flue gas LT dry process removed dust, add the one-level coal between switching station and diffuse chimneyThe bag type dust collector adopts a high-temperature-resistant anti-static filter material, can effectively filter ultrafine dust which is not collected by the electrostatic dust collector, and can well adapt to the problem that the smoke emission exceeds the standard due to the problems of deformation and fracture of an internal polar plate polar line, dust deposition and blockage of an evaporative cooler, system explosion venting in actual operation and the like of the electrostatic dust collector. The bag type dust collector has good adaptability to the large-range fluctuation of the dust concentration of the flue gas due to the advantages of the self-filtering mechanism, and stably controls the dust concentration at the outlet of the diffusing chimney to be 10mg/Nm under the conditions that the temperature of the flue gas is not over standard and the filter bag is not damaged3Within.
Drawings
FIG. 1 is a process flow diagram of a converter gas bleeding bag-type dust removal ultra-low emission treatment system according to an embodiment of the present invention;
wherein, 1-converter; 2-vaporizing and cooling the flue; 3-an evaporative cooling spray atomization system; 4-an evaporative cooling tower; 5-gas pipeline; 6-an electrostatic precipitator; 7-a fan; 8, a silencer; 9-a switching station; 10-emergency anti-detonation quenching device; 11-an emergency water storage tank; 12-a spark catcher; 13-pulse blowing bag type dust collector; 14-pneumatic conveying system; 15-pneumatic conveying pipeline; 16-a diffusing chimney; 17-gas cooler; 18-gas cooler atomization system; 19-gas pipeline; 20-coarse ash bin; 21-fine ash bin.
Detailed Description
According to the utility model, the converter primary flue gas dry processing system comprises an evaporative cooling tower, a dry electrostatic dust collector, a fan, a silencer and a switching station which are communicated with the converter from the upstream to the downstream in sequence according to the flow direction of primary flue gas pumped from the converter;
the switching station is respectively communicated with a gas tank and a cloth bag type dust collector through pipelines, and the flue gas treated by the cloth bag type dust collector is discharged through a chimney;
the cloth bag type dust collector is made of high-temperature-resistant anti-static filter materials, and the main body of the dust collector is of a plurality of groups of cylindrical structures;
and a cooling device and a spark catcher are arranged between the switching station and the bag type dust collector, and the cooling device is arranged on a flue at the front end of the spark catcher.
The flue gas flow direction is divided into two paths after station switching: (1) when the coal gas components in the flue gas do not meet the recovery conditions, the switching station switches the flow direction of the flue gas to a bag type dust collector, and the flue gas is discharged into the atmosphere through a diffusing chimney; (2) when the gas components in the flue gas meet the recovery conditions, the switching station switches the flow direction of the flue gas to a gas cooler and then sends the flue gas to a gas chamber through a gas pipeline.
The bag type dust collector is an explosion-proof/dew-condensation type ultralow-emission pulse blowing bag type dust collector, the main body of the dust collector is of a plurality of groups of cylindrical structures, and the dust collector is suitable for smoke to flow in a plunger type, so that dead corners in the dust collector are avoided, and the compression resistance is improved.
Cooling device is emergent formula anti-explosion urgent cooling device, sets up on mars trap front end flue, and its component parts include: set up multirow atomizing nozzle in flue gas pipeline, nozzle upstream pipeline is including supplying steam conduit, water supply pipe, confession nitrogen pipe way, can provide multinomial atomizing medium, and every medium is supporting to have the start control valves, and atomizing nozzle can be according to flue gas temperature packet control.
The water supply pipeline is provided with an emergency water storage tank, a nitrogen valve set for pressurizing the emergency water storage tank, and a water inlet pipeline and a nitrogen inlet pipeline.
The spark catcher is of a horizontal structure, is arranged at the front end of the pulse-jet cloth bag type dust collector, adopts a rotational flow type catching mode, utilizes the inlet rotational flow type guide vanes to guide smoke to rotate and flow, and extinguishes and catches spark dust after colliding with the guide vanes or the cylinder wall through inertia and centrifugal action.
The explosion-proof/dew-condensation-type ultralow-emission pulse-blowing bag-type dust collector comprises a spark catcher and an explosion-proof/dew-condensation-type ultralow-emission pulse-blowing bag-type dust collector body, wherein explosion venting valves are arranged on the spark catcher and the dust collector body, and pressure can be timely vented when explosion occurs in the equipment.
The outer surfaces of the spark catcher and the bag type dust collector are provided with heat preservation devices, so that dust hardening caused by the temperature reduction of flue gas in the equipment is prevented.
The flue gas pipeline, the spark catcher and the bag type dust collector between the switching station and the diffusing chimney are respectively provided with a nitrogen displacement device, so that excessive oxygen and coal gas in the pipeline and the equipment are displaced under abnormal working conditions, and the possibility of explosion in the pipeline and the equipment is prevented. Compressed nitrogen used by the nitrogen replacement system and the ash removal system of the bag type dust collector needs to be heated to a set temperature by a heater.
The present invention is described below with reference to the accompanying drawings.
As shown in fig. 1, the primary flue gas dry processing system sequentially comprises an evaporative cooling tower 4, an electrostatic precipitator 6, a fan 7 and a switching station 9 which are communicated with a converter 1 from upstream to downstream according to the gas discharge flow direction, and the gas flow direction after the switching station is divided into two paths: (1) when the gas components do not meet the recovery conditions, the switching station 9 switches the gas flow direction to a pulse injection bag type dust collector 13, and the gas is discharged into the atmosphere through a diffusing chimney; (2) when the gas components meet the recovery conditions, the switching station 9 switches the gas flow direction to the gas cooler 17 and then sends the gas to the gas cabinet through the gas pipeline.
The bottom of the evaporative cooling tower 4 is connected with a coarse ash bin 20 for receiving coarse particles in the converter gas which settle to the bottom of the evaporative cooling tower 4. The bottom of the pulse blowing bag type dust collector 13 is provided with a pneumatic conveying system 14 which is used for receiving fine dust obtained by filtering primary flue gas of a converter by a ceramic gas bag type dust collector and conveying the fine dust to a fine dust bin 21 or an independent dust bin of an electrostatic dust collector through a pneumatic conveying pipeline 15.
The pulse blowing bag type dust collector 13 comprises a pulse ash removal system and a filtering system. The filtering system comprises a plurality of groups of dust removing units which are connected in parallel, each dust removing unit comprises a barrel and an ash bucket, the ash bucket is funnel-shaped, an air inlet is formed in the lower part of the barrel, and an air outlet is formed in the top of the barrel.
The dedusting method of the steelmaking converter gas by using the dedusting equipment comprises the following steps:
(1) the primary flue gas (raw gas) of the converter 1 enters the vaporization cooling flue 2 for cooling through the furnace mouth smoke hood under the negative pressure action of the gas dust removal system, and then enters the evaporation cooling tower 4. The primary flue gas is cooled in the evaporative cooling tower through the evaporative cooling spraying atomization system 3, and the temperature is reduced from 1000 ℃ to 250 ℃. In the process, 20-40% of coarse particle dust in the primary flue gas directly settles to the bottom of the tower and is conveyed to the coarse ash bin 20 through the ash conveying system.
(2) The water spraying amount in the evaporative cooling tower 4 can be adjusted according to the flue gas amount and the flue gas temperature, so that the flue gas temperature at the outlet of the tower is changed stably, and the operation effect and the service life of the electrostatic dust collector 6 are ensured. When the water spraying amount is small, the temperature of the flue gas at the outlet of the evaporative cooling tower 4 is too high, so that the electrode wires in the downstream electrostatic dust collector 6 are easy to deform due to excessive heating; when the water spraying amount is larger, the temperature of the flue gas at the outlet of the evaporative cooling tower 4 is too low, so that condensed water is easily generated inside the downstream electrostatic dust collector 6, the power supply voltage of the electrostatic dust collector is unstable, dust is hardened, and the dust removing and ash removing effects are reduced;
(3) introducing the primary flue gas of the converter treated by the evaporative cooling tower 4 into an electrostatic precipitator 6, filtering fine dust in the converter gas, wherein the temperature of the flue gas at the inlet of the precipitator after being cooled by a gas pipeline is 170-180 ℃, and the dust emission concentration is not more than 20mg/Nm3. The fine dust collected by the electrostatic precipitator 6 is conveyed to the fine ash bin 21 by an ash conveying system.
(4) The treated flue gas passes through a fan 7, a silencer 8 and a switching station 9, when the gas components do not meet the recovery conditions, the switching station switches the gas flow direction to a spark catcher 12 and a pulse-jet bag-type dust collector 13, and then the gas is discharged into the atmosphere through a diffusion chimney 16; when the gas components meet the recovery conditions, the switching station 9 switches the gas flow direction to the gas cooler 17, and the gas is cooled by the gas cooler atomizing system 18 in the cooler 17 and then sent to the gas cabinet through the gas pipeline 19.
(5) Be provided with emergent formula anti-explosion rapid cooling device 10 on 12 front end flues of mars catcher, its component parts include: set up multirow atomizing nozzle in flue gas pipeline, nozzle upstream pipeline is including supplying steam conduit, water supply pipe, confession nitrogen pipe way, can provide multinomial atomizing medium, and every medium is supporting to have the start control valves, and atomizing nozzle can be according to flue gas temperature packet control. The water supply pipeline is matched with an emergency water storage tank 11 for stabilizing water supply pressure.
The utility model discloses a converter coal gas diffuses super low emission processing system of bag-type dust removal is on the basis of LT dry process dust pelletizing system of converter, adds flue gas sack cleaner of one-level between switching station and chimney, and the high temperature resistant anti-static filter material of its adoption has filter fineness height, can adapt to characteristics such as the flue gas dust concentration change of not equidimension.
According to the utility model discloses a bag collector need overcome the latent safety problem temperature resistant problem that a flue gas composition changes and causes, and dust remover and mars trap need add nitrogen gas replacement system to guarantee under any abnormal production condition, the possibility of blasting can not appear in the dust remover inside. The body, the dust removal pipeline and other structural components of the dust remover also need to have the temperature resistant characteristic, and sealing members, monitoring instruments, operation boxes and the like among all the parts of the equipment need to have the temperature resistant characteristic so as to ensure that the whole dust remover is lower than 2% of air leakage rate.
In order to prevent the internal condensation and the potential accidental injury to the outside operators caused by the excessive heat dissipation of the equipment shell, the shell of the dust remover is integrally wrapped in a heat insulation way.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A converter primary dry dedusting diffused flue gas ultra-low emission purification treatment system is characterized by comprising an evaporative cooling tower, an electrostatic precipitator, a fan, a silencer and a switching station which are communicated with a converter from upstream to downstream in sequence according to the flow direction of primary flue gas pumped from the converter;
the switching station is respectively communicated with a gas tank and a cloth bag type dust collector through pipelines, and the flue gas treated by the cloth bag type dust collector is discharged through a chimney;
the cloth bag type dust collector is made of high-temperature-resistant anti-static filter materials, and the main body of the dust collector is of a plurality of groups of cylindrical structures;
and a cooling device and a spark catcher are arranged between the switching station and the bag type dust collector, and the cooling device is arranged on a flue at the front end of the spark catcher.
2. The system of claim 1, wherein the cooling device comprises a plurality of rows of atomizing nozzles disposed in the flue gas duct, and the upstream duct of the nozzles comprises a steam supply duct, a water supply duct, and a nitrogen supply duct.
3. The ultra-low emission purification treatment system for the once dry dedusting and diffusing flue gas of the converter according to claim 2, wherein the water supply pipeline is provided with an emergency water storage tank, a nitrogen valve set for pressurizing the emergency water storage tank, and water and nitrogen inlet pipelines.
4. The system for the ultra-low emission purification treatment of the diffused flue gas by the primary dry dedusting of the converter according to claim 1, wherein explosion venting valves are arranged on the cylinders of the spark catcher and the bag type deduster.
5. The system for the ultra-low emission purification treatment of the flue gas emitted by the converter through the primary dry dedusting according to claim 1, wherein a heat preservation device is arranged on the outer surfaces of the spark catcher and the bag type dust collector.
6. The system for the ultra-low emission purification treatment of the flue gas discharged by the primary dry dedusting of the converter according to claim 1, wherein a flue gas pipeline, a spark catcher and a bag type dust collector between the switching station and the discharge chimney are respectively provided with a nitrogen gas replacement device.
7. The system for the ultra-low emission and purification treatment of the diffused flue gas by the primary dry dedusting of the converter according to claim 1, wherein a coarse ash bin is connected to the bottom of the evaporative cooling tower.
8. The ultra-low emission purification treatment system for the primary dry dedusting and emission flue gas of the converter according to claim 1, wherein a pneumatic conveying system is arranged at the bottom of the bag-type dust collector and is communicated with a fine ash bin or an independent ash bin of the electrostatic dust collector.
9. The converter primary dry dedusting diffused flue gas ultra-low emission purification treatment system according to claim 1, wherein the bag-type deduster comprises a pulse ash cleaning system and a filtering system.
10. The ultra-low emission purification treatment system for the once dry dedusting diffused flue gas of the converter according to claim 9, wherein the filtering system of the bag-type deduster comprises a plurality of groups of dedusting units connected in parallel, each dedusting unit comprises a barrel and an ash bucket, the ash bucket is funnel-shaped, an air inlet is formed in the lower part of the barrel, and an air outlet is formed in the top of the barrel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021129279.0U CN213977762U (en) | 2020-06-17 | 2020-06-17 | Converter one-time dry dedusting diffusion flue gas ultralow emission purification treatment system |
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| CN202021129279.0U CN213977762U (en) | 2020-06-17 | 2020-06-17 | Converter one-time dry dedusting diffusion flue gas ultralow emission purification treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116673126A (en) * | 2023-08-03 | 2023-09-01 | 南京恒瑞环保科技有限公司 | Explosion-proof dry electrostatic precipitator and filter cartridge precipitator combined dust removal system and method |
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2020
- 2020-06-17 CN CN202021129279.0U patent/CN213977762U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116673126A (en) * | 2023-08-03 | 2023-09-01 | 南京恒瑞环保科技有限公司 | Explosion-proof dry electrostatic precipitator and filter cartridge precipitator combined dust removal system and method |
| CN116673126B (en) * | 2023-08-03 | 2024-02-02 | 南京恒瑞环保科技有限公司 | Explosion-proof dry electrostatic precipitator and filter cartridge precipitator combined dust removal system and method |
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