CN214529105U - Dry dedusting system of converter - Google Patents
Dry dedusting system of converter Download PDFInfo
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- CN214529105U CN214529105U CN202120354845.6U CN202120354845U CN214529105U CN 214529105 U CN214529105 U CN 214529105U CN 202120354845 U CN202120354845 U CN 202120354845U CN 214529105 U CN214529105 U CN 214529105U
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Abstract
The utility model discloses a dry process dust pelletizing system of converter, include: the vaporization flue is positioned above the converter; the evaporative cooler is connected with the evaporation flue; the electric dust collector is connected with the evaporative cooler; the fan is connected with the electric dust collector; the smoke switching station is connected with the fan; the smoke switching station comprises a first outlet and a second outlet, the first outlet is connected with the recycling cup valve, and the second outlet is connected with the diffusing cup valve; the gas recovery component is connected with the recovery cup valve and is used for recovering the gas in the high-temperature flue gas; one end of the fine dust collector is connected with the diffusing cup valve, and the other end of the fine dust collector is connected with the smoke discharge mechanism; the fine dust collector is used for filtering and removing dust of the high-temperature flue gas passing through the diffusing cup valve; the fine dust collector comprises an intermetallic compound filter cylinder, and a filter element of the intermetallic compound filter cylinder is an intermetallic compound asymmetric porous membrane; the dust removal system can enable the particles in the converter flue gas to reach the ultralow emission standard.
Description
Technical Field
The utility model relates to a steel smelting technical field especially relates to a dry process dust pelletizing system of converter.
Background
In recent years, the environmental pollution problem of the steel industry is highly regarded by the nation, the ultralow emission work of the steel industry is greatly promoted in the nation, the steel industry is in the key period of structure adjustment and optimization upgrading and faces increasingly severe resource and environmental pressure, and the ultralow emission work of the steel industry is guided and promoted along with the issuing of a series of policy documents of the ecological environment department, namely, the opinion on promoting the implementation of the ultralow emission of the steel industry.
The primary dust removal of the steel converter is taken as a main pollution discharge source point of a steel making process, and a wet dust removal process or a dry dust removal process is generally used at present. The emission concentration of the particulate matters is 30mg/m3—80mg/m3In the meantime. At the current emission level, the aim of iron and steel enterprises which have transformation conditions nationwide before the end of 2025, which is proposed by the national ecological environment ministry, to realize 10mg/m3Ultra-low emission targets. In daily production, the phenomenon of periodic standard exceeding emission inevitably occurs due to factors such as maintenance of a dust remover or other equipment, equipment failure, deflagration and the like, so that the problem of how to enable converter flue gas subjected to dry dust removal to meet the target of ultralow emission becomes a current continuous solution.
SUMMERY OF THE UTILITY MODEL
The utility model provides a dry dedusting system of converter to solve or partially solve the technical problem that converter flue gas after the dry dedusting system of current converter can't guarantee to remove dust reaches ultralow emission target requirement.
In order to solve the technical problem, the utility model provides a dry dedusting system of converter, include:
the vaporization flue is positioned above the converter;
the evaporation cooler is connected with the vaporization flue and is used for cooling the high-temperature flue gas of the converter and settling coarse particles in the high-temperature flue gas;
the electric dust remover is connected with the evaporative cooler and is used for performing electric dust removal on the cooled high-temperature flue gas;
the fan is connected with the electric dust collector and is used for driving the high-temperature flue gas of the converter to enter the dry dedusting system from the vaporization flue;
the smoke switching station is connected with the fan; the smoke switching station comprises a first outlet and a second outlet, the first outlet is connected with the recycling cup valve, and the second outlet is connected with the diffusing cup valve;
the gas recovery component is connected with the recovery cup valve and is used for recovering the gas in the high-temperature flue gas;
one end of the fine dust collector is connected with the diffusing cup valve, and the other end of the fine dust collector is connected with the smoke discharge mechanism; the fine dust collector is used for filtering and removing dust of the high-temperature flue gas passing through the diffusing cup valve; the fine dust collector comprises an intermetallic compound filter cylinder, and a filter element of the intermetallic compound filter cylinder is an intermetallic compound asymmetric porous membrane.
Optionally, the filter element is a cylindrical folding filter element, the diameter of the filter element is 160 mm-240 mm, and the height of the filter element is 2000 mm-3000 mm.
Optionally, the number of the intermetallic compound filter cartridges is 300-400.
Optionally, the filter element is one of an FeAl asymmetric porous membrane, a NiAl asymmetric porous membrane and a TiAl asymmetric porous membrane.
Optionally, the thickness of the intermetallic compound asymmetric porous membrane is 0.4-0.6 mm.
Optionally, the maximum pore size of the asymmetric porous intermetallic compound membrane is within 25 μm, and the average pore size is within 20 μm.
Optionally, the intermetallic compound asymmetric porous membrane has a porosity of 40% or more.
Optionally, the fan is an ID fan.
Optionally, the gas recovery assembly comprises a gas cooler and a gas tank, and the gas cooler is connected between the recovery cup valve and the gas tank.
According to the technical scheme, the inlet pipe diameter of the fine dust collector is 1400-1800 mm.
Through the utility model discloses an one or more technical scheme, the utility model has following beneficial effect or advantage:
the utility model provides a dry dedusting system applied to a converter, which comprises a vaporization flue, an evaporative cooler, an electric dust remover, a fan, a flue gas switching station, a coal gas recovery assembly and a fine dust remover, and realizes that in the coal gas recovery stage, the converter flue gas enters the evaporative cooler for cooling through the vaporization flue and enters a coal gas recovery mechanism for recovering coal gas through the flue gas switching station and a recovery cup valve after the electric dust remover removes dust; in the non-gas recovery stage, converter flue gas subjected to primary dust removal by electric dust removal enters a fine dust remover from a diffusing cup valve to be subjected to secondary dust removal and then is discharged; the fine dust collector uses an intermetallic compound filter cylinder and an intermetallic compound asymmetric porous membrane filter core, has the characteristics of large flux, small resistance, strong conductivity, magnetization resistance, high temperature resistance and high filtering precision, and can be well used for secondary dust removal of converter flue gas; therefore, the particulate matters in the converter flue gas can also reach the ultralow emission standard in the non-recovery stage of the converter flue gas or the abnormal stages of dust remover failure, explosion venting and equipment maintenance.
Drawings
Fig. 1 is a schematic diagram of a dry dedusting system provided in an embodiment of the present invention;
description of reference numerals:
1. a vaporization flue; 2. an evaporative cooler; 3. an electric dust collector; 4. a fan; 5. a flue gas switching station; 6. A recovery cup valve; 7. a blow-off cup valve; 8. a gas recovery assembly; 9. a fine dust collector; 10. and a flue gas discharge mechanism.
Detailed Description
In order to make the technical personnel in the technical field of the present invention understand the present invention more clearly, the following description is made in detail for the technical solution of the present invention through the specific embodiments with reference to the attached drawings. Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control. Unless otherwise specifically stated, various devices and the like used in the present invention are commercially available or can be prepared by an existing method.
In order to solve the particulate matter emission concentration that current dry process electrostatic precipitator system can't further reduce the converter flue gas, can not guarantee that the converter flue gas satisfies the problem that the ultralow emission required, refer to fig. 1, the embodiment of the utility model provides a dry process dust pelletizing system of converter, include:
the vaporization flue 1 is positioned above the converter;
the evaporative cooler 2 is connected with the vaporization flue 1 and is used for cooling the high-temperature flue gas of the converter and settling coarse particles in the high-temperature flue gas;
the electric dust remover 3 is connected with the evaporative cooler 2 and is used for performing electric dust removal on the cooled high-temperature flue gas;
the fan 4 is connected with the electric dust collector 3 and is used for driving the high-temperature flue gas of the converter to enter the dry dedusting system from the vaporization flue 1;
the smoke switching station 5 is connected with the fan 4; the flue gas switching station 5 comprises a first outlet and a second outlet, the first outlet is connected with a recovery cup valve 6, and the second outlet is connected with a diffusion cup valve 7;
the coal gas recovery component 8 is connected with the recovery cup valve 6 and is used for recovering coal gas in the high-temperature flue gas;
one end of the fine dust collector 9 is connected with the diffusing cup valve 7, and the other end is connected with the smoke discharge mechanism 10; the fine dust collector 9 is used for filtering and removing dust of the high-temperature flue gas passing through the diffusing cup valve 7; wherein, the fine dust collector 9 comprises an intermetallic compound filter cylinder, and a filter element of the intermetallic compound filter cylinder is an asymmetric porous membrane of the intermetallic compound.
Specifically, the dry dedusting system provided by the embodiment can be applied to an ultralow emission process route of converter primary dedusting; when the high-temperature flue gas of the converter is treated, the treatment method can be divided into two stages: a coal gas recovery stage and a non-coal gas recovery stage.
When the converter is in a coal gas recovery stage, the recovery cup valve 6 is opened, the diffusing cup valve 7 is closed, primary flue gas of the converter with CO as a main component enters the evaporative cooler 2 from the vaporization flue 1 to be cooled under the action of the fan 4, coarse particles in the primary flue gas are settled and then enter the electric dust collector 3 to be dedusted, and then the primary flue gas enters the coal gas recovery assembly 8 through the flue gas switching station 5 and the recovery cup valve 6 to be recycled. Optionally, the gas recovery assembly 8 comprises a gas cooler and a gas tank, and the gas cooler is connected between the recovery cup valve 6 and the gas tank; after the gas cooler further cools the flue gas, the gas is recycled through the gas chamber. The Fan 4 may use an ID Fan, which is also called an Induced Draft Fan (IDFI) for short. The flue gas discharge means 10 may be a stack.
When the coal gas recovery device is in a non-coal gas recovery stage, the recovery cup valve 6 is closed, the diffusing cup valve 7 is opened, primary dedusting smoke subjected to electric dedusting enters the fine dust collector 9 through the diffusing cup valve 7, and the smoke is discharged after reaching an ultralow emission target through high-precision filtering of the fine dust collector 9.
The core principle of the fine dust collector 9 adopted in the embodiment is filtration type dust collection, and the structure of the fine dust collector is the same as that of the existing filtration type dust collector, and the difference is that an intermetallic compound filter cartridge is used as the filtration filter cartridge, and an asymmetric porous membrane of the intermetallic compound is used as a filter element. The intermetallic compound asymmetric porous membrane material is a mixed bond structure which utilizes intermetallic compounds with metallic bonds and covalent bonds, has the characteristics of good oxidation resistance, good acid and alkali resistance, good temperature resistance, high strength, low linear expansion coefficient, processability, weldability and good thermal vibration resistance, and has the characteristics of large flux, small resistance, strong conductivity, magnetization resistance, high temperature resistance, high filtering precision and the like. Optionally, the inlet pipe diameter of the fine dust collector 9 is 1400-1800 mm. The dry-method electric dust removal device is suitable for working conditions of high temperature, flammability, explosiveness and the like of dry-method electric dust removal flue gas. Can stably realize the standard emission of the particulate matters.
The optional specification parameters of the intermetallic filter cartridge and the intermetallic asymmetric porous membrane in this example are as follows:
optionally, the filter element is a cylindrical folding filter element, the diameter of the filter element is 160 mm-240 mm, and the height of the filter element is 2000 mm-3000 mm.
Optionally, the number of the intermetallic compound filter cartridges is 300-400, and the preferable number is 320, 340.
Optionally, the filter element is one of an FeAl asymmetric porous membrane, a NiAl asymmetric porous membrane and a TiAl asymmetric porous membrane. FeAl, NiAl and TiAl are high-temperature-resistant and corrosion-resistant intermetallic compounds, and can be in service for a long time in the high-temperature and corrosion environment of converter flue gas.
Optionally, the thickness of the intermetallic compound asymmetric porous membrane is 0.4-0.6 mm.
Optionally, the maximum pore size of the asymmetric porous intermetallic compound membrane is within 25 μm, and the average pore size is within 20 μm.
Optionally, the intermetallic compound asymmetric porous membrane has a porosity of 40% or more.
A converter process route using the dry dedusting system is as follows:
the process flow is described by taking a converter steelmaking smelting period (the converter shaking is right after the tapping of the previous furnace is finished as a starting and ending point, and the smelting period is about 45 min/furnace): in the early stage (0-13 min) of converter gas recovery, the converter finishes the work of adding molten iron, adding scrap steel and the like, the diffusing cup valve 7 is in an open state and the recovering cup valve 6 is in a closed state at this stage, converter flue gas directly enters the fine dust collector 9 through the diffusing cup valve 7 after electric dust removal for high-precision dust removal, and is ignited by long naked flame from the diffusing chimney and then discharged; in the recovery period (13-27 min) of the converter gas, the converter mainly performs oxygen lance oxygen blowing, unqualified gas in the early stage is directly discharged after high-precision dust removal through a fine dust remover 9, when the converter gas meets the gas recovery condition in the stage, a recovery cup valve 6 is opened, a diffusion cup valve 7 is closed, the converter gas as qualified gas enters a gas cooler for cooling, then enters a gas cabinet and is uniformly mixed by a gas pressurization station; in the later stage (28-45 min) of the recovery of the converter gas, the converter mainly completes the operations of temperature measurement, slag pouring, steel tapping and the like, and in the stage, in the later stage of oxygen blowing, the converter gas does not meet the gas recovery conditions, the diffusing cup valve 7 is opened, the recovery cup valve 6 is closed, the converter gas directly enters the fine dust remover 9 through the diffusing cup valve 7 for high-precision dust removal, and is ignited by long-time open fire from the diffusing chimney and then discharged, so that the smelting period of a furnace of molten steel is completed.
Wherein, if the converter gas can not be recovered during the whole oxygen blowing period, all the gas is directly ignited and discharged after being dedusted with high precision by the fine deduster 9.
A small amount of dust intercepted by the fine dust collector 9 passes through an ash bucket ash discharge valve, and is periodically discharged, bagged and transported outside.
The fine dust collector 9 performs continuous back flushing regeneration operation on the intermetallic compound filter cylinder by utilizing the recovery period (13 th-27 th min) of the converter gas, recovers the flux of the filter element and prepares for dust removal of next steel making in a furnace.
If the electric field of the dust remover is powered off due to explosion venting of the electric dust remover 3 or due to grounding of polar lines in the electric dust remover 3 in the gas recovery stage, the dust remover loses the dust supplementing and collecting capacity, and high-concentration dust is discharged; at the moment, the diffusing cup valve 7 is controlled to be opened, and the recycling cup valve 6 is controlled to be closed, so that the flue gas which cannot be completely removed by the electric dust remover 3 is subjected to dust removal in the fine dust remover 9.
If equipment maintenance and other non-smelting recovery periods occur, the converter flue gas is always in a diffusing state, part of dust is inevitably discharged to the outside, at the moment, the fine dust collector 9 is in a working state, and the flue gas is uniformly dedusted by the fine dust collector 9.
The embodiment provides a dry dedusting system applied to a converter, which comprises a vaporization flue, an evaporative cooler, an electric dust remover, a fan, a flue gas switching station, a coal gas recovery assembly and a fine dust remover, and realizes that in a coal gas recovery stage, converter flue gas enters the evaporative cooler for cooling through the vaporization flue and enters a coal gas recovery mechanism for recovering coal gas through the flue gas switching station and a recovery cup valve after the electric dust remover removes dust; in the non-gas recovery stage, converter flue gas subjected to primary dust removal by electric dust removal enters a fine dust remover from a diffusing cup valve to be subjected to secondary dust removal and then is discharged; the fine dust collector uses an intermetallic compound filter cylinder and an intermetallic compound asymmetric porous membrane filter core, has the characteristics of large flux, small resistance, strong conductivity, magnetization resistance, high temperature resistance and high filtering precision, and can be well used for secondary dust removal of converter flue gas; therefore, the particulate matters in the converter flue gas can also reach the ultralow emission standard in the non-recovery stage of the converter flue gas or the abnormal stages of dust remover failure, explosion venting and equipment maintenance.
In the following embodiment, the dust removing system is described with reference to specific data:
in the primary dust removal process of the converter with the nominal capacity of 210t, a dry-method electric dust removal process (an evaporative cooling tower +4 electric field cylinder horizontal electric dust remover) is adopted, and the emission concentration of particulate matters is about 25mg/m3And the ultra-low emission requirement is not met.
The emission concentration of the converter flue gas emission particles before modification is detected by a third-party monitoring mechanism, and the detection result data is shown in table 1:
table 1: use the utility model discloses a discharge data before dust pelletizing system
After the process route is reformed, a fine dust collector comprising an intermetallic compound filter cylinder and an intermetallic compound asymmetric membrane filter element is added at the diffusing side, and the main process parameters of the fine dust collector are shown in a table 2:
TABLE 2 dust removal parameter index of fine dust remover
After the dust removal system stably operates, the emission concentration of the transformed converter flue gas emission particles is detected by the same third-party monitoring mechanism, and the detection result data is shown in table 3:
table 3: use the utility model discloses a discharge data after dust pelletizing system
It can be seen from comparison table 1 and table 3, adopt the utility model provides a dust pelletizing system can stably realize that particulate matter emission concentration is less than or equal to 10mg/m 3's control target. Meanwhile, the disordered discharge phenomenon of the diffusing chimney under the abnormal working condition is reduced. In the system upgrading and transformation process, normal production of the converter is not affected, and after the system is built, the converter can be put into operation after the maintenance time (about 36 hours) is utilized for connecting the pipelines.
Meanwhile, the dust removal system is also suitable for new and reconstruction projects of dry-method electric dust removal, and has the advantages of small floor area, low construction difficulty, short construction period, small system resistance, high dust removal precision and ultralow concentration emission.
Through the utility model discloses an one or more technical scheme, the utility model has following beneficial effect or advantage:
the utility model provides a dry dedusting system applied to a converter, which comprises a vaporization flue, an evaporative cooler, an electric dust remover, a fan, a flue gas switching station, a coal gas recovery assembly and a fine dust remover, and realizes that in the coal gas recovery stage, the converter flue gas enters the evaporative cooler for cooling through the vaporization flue and enters a coal gas recovery mechanism for recovering coal gas through the flue gas switching station and a recovery cup valve after the electric dust remover removes dust; in the non-gas recovery stage, converter flue gas subjected to primary dust removal by electric dust removal enters a fine dust remover from a diffusing cup valve to be subjected to secondary dust removal and then is discharged; the fine dust collector uses an intermetallic compound filter cylinder and an intermetallic compound asymmetric porous membrane filter core, has the characteristics of large flux, small resistance, strong conductivity, magnetization resistance, high temperature resistance and high filtering precision, and can be well used for secondary dust removal of converter flue gas; therefore, the particulate matters in the converter flue gas can also reach the ultralow emission standard in the non-recovery stage of the converter flue gas or the abnormal stages of dust remover failure, explosion venting and equipment maintenance.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A dry dedusting system for a converter, the dry dedusting system comprising:
the vaporization flue is positioned above the converter;
the evaporation cooler is connected with the vaporization flue and is used for cooling the high-temperature flue gas of the converter and settling the coarse particles in the high-temperature flue gas;
the electric dust remover is connected with the evaporative cooler and is used for performing electric dust removal on the cooled high-temperature flue gas;
the fan is connected with the electric dust collector and is used for driving the high-temperature flue gas of the converter to enter the dry dedusting system from the vaporization flue;
the smoke switching station is connected with the fan; the smoke switching station comprises a first outlet and a second outlet, the first outlet is connected with the recycling cup valve, and the second outlet is connected with the diffusing cup valve;
the coal gas recovery assembly is connected with the recovery cup valve and is used for recovering coal gas in the high-temperature flue gas;
one end of the fine dust collector is connected with the diffusing cup valve, and the other end of the fine dust collector is connected with the smoke discharge mechanism; the fine dust collector is used for filtering and removing dust of the high-temperature flue gas passing through the diffusing cup valve; the fine dust collector comprises an intermetallic compound filter cylinder, and a filter element of the intermetallic compound filter cylinder is an intermetallic compound asymmetric porous membrane.
2. The dry dusting system of claim 1, wherein the filter element is a cylindrical pleated filter element having a diameter of 160mm to 240mm and a height of 2000mm to 3000 mm.
3. The dry dusting system of claim 1, where the number of intermetallic filter cartridges is 300 to 400.
4. The dry dedusting system of claim 1, wherein the filter element is one of a FeAl asymmetric porous membrane, a NiAl asymmetric porous membrane, and a TiAl asymmetric porous membrane.
5. The dry dedusting system of claim 1, wherein the asymmetric porous intermetallic membrane has a thickness of 0.4 mm to 0.6 mm.
6. The dry dedusting system of claim 1, wherein the asymmetric porous intermetallic membrane has a maximum pore size within 25 μ ι η and an average pore size within 20 μ ι η.
7. The dry dedusting system of claim 1, wherein the porosity of the asymmetric porous intermetallic membrane is greater than or equal to 40%.
8. The dry dusting system of claim 1, wherein the fan is an ID fan.
9. The dry dusting system of claim 1 where the gas recovery assembly comprises a gas cooler and a gas cabinet, the gas cooler being connected between the recovery cup valve and the gas cabinet.
10. The dry dedusting system of any one of claims 1 to 9, wherein the inlet pipe diameter of the fine deduster is 1400 to 1800 mm.
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| CN202120354845.6U CN214529105U (en) | 2021-02-08 | 2021-02-08 | Dry dedusting system of converter |
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| CN202120354845.6U CN214529105U (en) | 2021-02-08 | 2021-02-08 | Dry dedusting system of converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029499A (en) * | 2022-06-13 | 2022-09-09 | 北京首钢股份有限公司 | Converter flue gas treatment system and maintenance method |
| 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 |
-
2021
- 2021-02-08 CN CN202120354845.6U patent/CN214529105U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029499A (en) * | 2022-06-13 | 2022-09-09 | 北京首钢股份有限公司 | Converter flue gas treatment system and maintenance method |
| 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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