CN110030841A - Dedusting of EAF equipment and dust removal method - Google Patents
Dedusting of EAF equipment and dust removal method Download PDFInfo
- Publication number
- CN110030841A CN110030841A CN201910332037.7A CN201910332037A CN110030841A CN 110030841 A CN110030841 A CN 110030841A CN 201910332037 A CN201910332037 A CN 201910332037A CN 110030841 A CN110030841 A CN 110030841A
- Authority
- CN
- China
- Prior art keywords
- dedusting
- eaf
- flue gas
- equipment
- electric arc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
Abstract
The invention belongs to metallurgical dust removal fields, and in particular to a kind of Dedusting of EAF equipment and its dust removal method.Dedusting of EAF technique main equipment of the invention includes the combustion chamber being sequentially connected to electric arc furnaces, water-cooled flue and the ultra-clean pulse dust collector of high temperature resistant.The present invention substantially relaxes the cooling requirement of flue gas, simplifies process flow, and machine power is air-cooled and mixed cold wind cooling etc. is no longer processing links indispensable in dust pelletizing system, total exhaust gas volumn of system is reduced, to greatly reduce construction cost and later period operating cost.
Description
Technical field
The invention belongs to metallurgical dust removal fields, and in particular to a kind of Dedusting of EAF equipment and dust removal method.
Background technique
Conventional Arc Furnace Cleaning System is mainly used for removing the high-temperature flue gas and electric furnace vehicle of the discharge of four hole of arc furnace cover
Between roof cover flue gas.Wherein, four hole of arc furnace cover discharge high-temperature flue gas by electric arc furnaces steel scrap and new hot metal charging it is electric
It is generated after the heating melting of pole, the dioxygen oxidation burning that the carbon in combustible and molten iron in steel scrap is blown into generates a large amount of heat
Energy and dust, temperature is up to 1400 DEG C~1600 DEG C；Electric furnace shop roof cover flue gas can not trap when including electric arc furnaces charging
By the flue gas of bell escaping slot when flue gas and electric furnace smelting.Although roof cover flue gas temperature is not high but air quantity is considerable.
By taking certain steel mill 90t electric stove dust as an example, dust collecting process is that the smoke evacuation of four holes is combined with the smoke evacuation of workshop roof cover
Trapping ways.Four hole of electric arc furnaces smoke evacuation air quantity is initially 730000m3/ h, 1400 DEG C of temperature, water cooled combustion chamber, water-cooled flue
Air quantity is reduced to 360000m after cooling down3/ h, 550 DEG C of temperature.Since water-cooled flue cooling efficiency reduces, it is additionally arranged wind
Cooler cooling, air quantity is 300000m after cooling3/ h, 400 DEG C of temperature.It is wanted to meet temperature of the deduster entrance not higher than 120 DEG C
It asks, the mixed wind air quantity of roof cover is designed as 1000000m3The total blast volume of/h, temperature 50 C, final dust pelletizing system reach
1300000m3/ h, mating two high-voltage motors in parallel of air-introduced machine, rated power reach 5000kW.
Existing Dedusting of EAF is all using above-mentioned process flow.Although flue gas smoke stack emission and uncontrollable discharge reach
Mark, but energy consumption is huge.
Summary of the invention
The purpose of the present invention is to provide a kind of Dedusting of EAF equipment.
A further object of the present invention is to provide a kind of Dedusting of EAF methods.
The Dedusting of EAF equipment of specific embodiment according to the present invention comprising the burning being sequentially connected to electric arc furnaces
Room, water-cooled flue and the ultra-clean pulse dust collector of high temperature resistant, the ultra-clean pulse dust collector of high temperature resistant include pulse dust cleaning system and
Filtration system, wherein
The filtration system includes multiple groups filter element parallel with one another, and each filter element includes shell, ash bucket and pottery
Porcelain filter cylinder, wherein
The lower part of the shell is connected to the top of the ash bucket, and air inlet is offered on the ash bucket, the shell
Top offers air outlet, and the air outlet of the shell and the air inlet of the ash bucket are oppositely arranged；
The inner horizontal of the shell is provided with card, and the shell is separated into the air-purifying chamber on top under by the card
The filter chamber in portion；
More ceramic filter drums are distributed in matrix form, and the outlet side of the ceramic filter drum is embedded in the card, and with it is described
Air-purifying chamber connection, and the inlet end of the ceramic filter drum is connected to the filter chamber；
The distance between adjacent ceramic filter cylinder is 30~50mm.
The Dedusting of EAF equipment of specific embodiment according to the present invention, wherein the combustion chamber by water cooling sliding sleeve with
The connection of four hole of electric arc furnaces.
The Dedusting of EAF equipment of specific embodiment according to the present invention further includes workshop roof cover, the workshop roof
It is located at the top of the electric arc furnaces.
The Dedusting of EAF equipment of specific embodiment, the water-cooled flue are connected to waste heat boiler according to the present invention.
The Dedusting of EAF method of specific embodiment according to the present invention, the dust removal method the following steps are included:
(1) flue gas that electric arc furnaces generates is passed through combustion chamber, settles the large dust particle in flue gas, and fill CO in flue gas
Divided combustion；
(2) by treated for step (1) combustion chamber, flue gas is passed through water-cooled flue cools down, and the temperature of flue gas is reduced to
300~600 DEG C；
(3) flue gas after cooling is passed through the ultra-clean pulse dust collector of high temperature resistant, makes the concentration of flue gas emission no more than 5mg/
Nm3。
The Dedusting of EAF method of specific embodiment according to the present invention, wherein the flue gas that the electric arc furnaces of step (1) generates
The combustion chamber is passed through by water cooling sliding sleeve.
The Dedusting of EAF method of specific embodiment according to the present invention further includes being absorbed in electric arc furnaces with workshop roof cover
The step of overflow flue gas.
Beneficial effects of the present invention:
The present invention provide a kind of efficient process industrial arc flue dust cleaner and corresponding flue dust dust removal method.This
It is controllable that processes, the total pressures of main exhauster such as electromechanical air-cooled, the mixed wind cooling in existing Dedusting of EAF technique is omitted in invention
System is within 5000Pa, and by taking certain steel mill 90t Dedusting of EAF equipment as an example, the total blast volume of existing cleaner is 1300000m3/
H, the deduster entrance flue gas temperature upper limit are 120 DEG C, and the matched high-voltage motor total rated power of blower is 5000kW, and uses this hair
Total blast volume can be reduced to 300000m by bright electric arc furnaces dust removing device3/ h, deduster inlet temperature are 400 DEG C, blower institute
Gas-distributing motor rated power is no more than 1200kW, not only energy saving, and can be by heat recovery.
Dedusting of EAF equipment of the invention has used the ultra-clean pulse dust collector of high temperature resistant, the ultra-clean pulse dust removal of the high temperature resistant
Device uses high-efficiency ceramic fiber filtering resistant to high temperature, and ceramic filter drum structural strength is up to 15kg/cm, the filtering of single ceramic filter drum
Area can realize 1.84m2, therefore, can effective filtering smoke.The distance between ceramic filter drum is less than 50mm, has been not only able to
Effect prevents mutually collision between ceramic filter drum from causing breakage, and can effectively control the occupied area of equipment.
After flue gas using Dedusting of EAF equipment processing electric arc furnaces of the invention, concentration of emission≤5mg/Nm3, it is minimum can
Reach 1mg/Nm3, reach ultra-clean emission request, meet ultra-clean emission request；The temperature upper limit for improving dust collecting process, after purification
For flue-gas temperature by being promoted to 300 DEG C or more lower than 100 DEG C, calorific value is very high, can send to other users and carry out UTILIZATION OF VESIDUAL HEAT IN.
Detailed description of the invention
Fig. 1 is the structural schematic diagram according to the Dedusting of EAF equipment of a specific embodiment of the invention；
Fig. 2 is the structural representation according to the dust removing units in the Dedusting of EAF equipment of a specific embodiment of the invention
Figure.
Wherein, 1- electric arc furnaces；Tetra- hole elbow of 2-；3- water cooling sliding sleeve；The combustion chamber 4-；5- water-cooled flue；6- waste heat boiler；7-
Cleaning shaft；The ultra-clean pulse dust collector of 8- high temperature resistant；81- air-purifying chamber；The filter chamber 82-；83- ash bucket；84- ceramic filter drum；85- flower
Plate；86- air inlet；87- air outlet；89- shell.
Specific embodiment
As shown in Figure 1, Dedusting of EAF equipment of the invention, including electric arc furnaces 1, combustion chamber 4, the water cooling cigarette being sequentially connected to
Road 5 and the ultra-clean pulse dust collector 8 of high temperature resistant, the filter type of the ultra-clean pulse dust collector 8 of high temperature resistant is outside filtering type, described resistance to
The purge mode of the ultra-clean pulse dust collector of high temperature is the clear dirt of pulse.The electric arc furnaces 1 and the combustion chamber 4 by four hole elbows 2,
Water cooling sliding sleeve 3 is connected to.Water-cooled flue 5 can also be connected to waste heat boiler 6.
Due to suction function, the extraction of Jing Sikong elbow 2 enters combustion chamber 4, passes through in combustion chamber 4 flue gas in electric arc furnaces 1
Full combustion and large dust particle sedimentation are crossed, into water-cooled flue 5.It exchanges heat, makes by the cooling of water-cooled flue 5 and waste heat boiler 6
Flue-gas temperature is down within the scope of 300 DEG C~600 DEG C.Combustion chamber 4 in Dedusting of EAF equipment of the invention, also known as expansion chamber,
Main function is to fire the residual CO in flue gas sufficiently in the combustion chamber by introducing air from the access space of water cooling sliding sleeve 3
It burns, and settles the large dust particle in flue gas.Combustion chamber 4 can be designed as arranging the water constituted by water cooling tube dense arrangement as needed
Cold type combustion chamber, or heat-resisting combustion chamber made of being built as heat proof material.According to flowing velocity needed for control flue gas and stop
The time is stayed, and then determines circulation interface and the height of combustion chamber.Wherein, flue gas flow rate is slower, and the residence time is longer, is more conducive to
The sedimentation of large dust particle and the burning of CO.By taking certain steel mill 90t Dedusting of EAF equipment as an example, exhaust gas volumn is in combustion chamber
730000m3/ h, flue-gas temperature are 1400 DEG C.
Flue gas again after ultra-clean 8 purified treatment of pulse dust collector of high temperature resistant directly through main exhauster, silencer and chimney outside
Drain into atmosphere.
The ultra-clean pulse dust collector 8 of high temperature resistant includes pulse dust cleaning system and filtration system.
As shown in Fig. 2, the filtration system includes multiple groups dust removing units parallel with one another, each dust removing units include
Shell 89 and ash bucket 83, the lower part of the shell 89 are connected to the top of the ash bucket 83, and the shape of the ash bucket 83 is funnel
Shape offers air inlet 86 on the ash bucket, and the top of the shell 89 offers air outlet 87, and the air outlet 87 and institute
Air inlet 86 is stated to be oppositely arranged；The inner horizontal of the shell 89 is provided with card 85, and the card 85 separates the shell
At the air-purifying chamber 81 on top and the filter chamber 82 of lower part, matrix form is distributed with more ceramic filter drums 84 on the card 85, and more
Ceramic filter drum 84 is distributed in matrix form, and the outlet side of the ceramic filter drum 84 is embedded in the card 85, and with the air-purifying chamber
81 connections, and the inlet end of the ceramic filter drum 84 is connected to the filter chamber 82；The ceramic filter drum 84 of adjacent two it
Between distance be 30~50mm.By taking 90t Dedusting of EAF equipment as an example, the ultra-clean pulse dust collector inlet flue gas amount of high temperature resistant is
300000m3/ h, flue-gas temperature are 400 DEG C, and deduster filter area is 5000m2, filtration velocity 1m/min.
The Dedusting of EAF equipment of specific embodiment according to the present invention, wherein pulse dust cleaning system further includes that compression is empty
Pneumatic module and deashing component.Wherein, compressed air component includes air accumulator, reducer unit ducts.Air accumulator be used for from
The compressed air of outer net access works as a buffer, and being blown every time with guarantee gas point has enough tolerance and stable air pressure；Subtract
Pressure valve group can be by outer net air pressure adjustment pressure to needed for using gas point.
Deashing component includes pulse valve, divides gas bag, injection tube.Wherein, pulse valve control compressed air the blowing time and
It is blown tolerance, with the effect of realization " pulse rapping "；Point gas bag will be distributed to multiple groups injection tube gas source all the way, and play buffering and
Pressure stabilization function；The compressed air of pulse valve blowing is oriented to each ceramic filter drum in dust removing units by injection tube.
The characteristics of pulse dust cleaning system is cleaning efficiency height, and different brands pulse valve installation dimension is substantially general, and equipment is more
It changes simple to operation.Pulse jet power relies on the high pressure of compressed air itself, without providing extra power, economical and energy saving.
Dedusting of EAF method of the invention, comprising the following steps:
(1) flue gas that electric arc furnaces generates is passed through combustion chamber, settles the large dust particle in flue gas, and fill CO in flue gas
Divided combustion；
(2) by treated for step (1) combustion chamber, flue gas is passed through water-cooled flue cools down, and the temperature of flue gas is reduced to
300~600 DEG C；
(3) flue gas after cooling is passed through the ultra-clean pulse dust collector ash bucket entrance of high temperature resistant enters inside deduster and remove
Dirt:
Large dust particle is directly settled down to hopper bottom, and little particle dust rises to filter chamber with air-flow；
Under the action of card upper and lower level pressure difference, hot fume passes through ceramic filter drum from outside to inside and enters air-purifying chamber, dust
It is trapped on the outside of filter cylinder；Purified gas is discharged by deduster air outlet again, to achieve the purpose that dedusting；
With the progress of filtering, the dust layer on the outside of filter cylinder is constantly thickened, when reaching certain resistance, dedusting pulse dust cleaning
Compressed air is sprayed into filter cylinder against airflow direction, is acted on by blowback and blow off cartridge exine dust, to reach by system starting
Deashing purpose；
Flue gas concentration through house outlet discharge is not more than 5mg/Nm3, due to being equipped with insulating layer, flue gas outside deduster
Temperature drop can be controlled in 10 DEG C or so.
Dedusting of EAF method of the invention further includes the steps that absorbing overflow flue gas in electric arc furnaces, vehicle with workshop roof cover
Between roof cover air quantity because of the smelting system and factory building height of electric furnace depending on, air quantity may be designed as 500000~1000000m3/h
It differs, flue-gas temperature is normally no higher than 50 DEG C during smelting, may be up to 80 DEG C during charging.Workshop roof cover can be according to practical feelings
Dust pelletizing system is separately provided in condition access four hole dust pelletizing system of electric furnace.
The filtering material of the ultra-clean pulse dust collector of high temperature resistant of Dedusting of EAF equipment of the invention is a kind of with ceramic fine
Dimension is the tubulose filtrate of substrate, has the characteristics that filtering accuracy height, high temperature resistant, hydrolysis, and theoretical heatproof can reach 900
DEG C, which is hard structure, does not have flexibility, therefore long service life, and installation does not need bag cage support, it is light-weight, more
It changes conveniently.
Dedusting of EAF equipment according to the present invention, the ultra-clean pulse dust collector of high temperature resistant need to overcome the problems, such as heatproof, except pottery
Porcelain filter cylinder sheet as heatproof filtrate outside, ontology, cleaning shaft and the other structure members of deduster also need to have heatproof spy
Property, deduster structural body and pipe material cannot use Q235 again, can use Q345,15CrMo or 304 according to different temperatures
Stainless steel material.Sealing element, measuring instrument between equipment components, control box etc. need to equally have high-temperature stability, to guarantee
Deduster is integrally lower than 2% air leak rate of air curtain.
To prevent caused by excessively radiating because of device housings internal structure and to the potential unexpected injury of extraneous operator,
Outer case of dust remover does whole thermal insulation cladding.
Claims (7)
1. Dedusting of EAF equipment, which is characterized in that the Dedusting of EAF equipment includes the burning being sequentially connected to electric arc furnaces
Room, water-cooled flue and the ultra-clean pulse dust collector of high temperature resistant, the ultra-clean pulse dust collector of high temperature resistant include pulse dust cleaning system and
Filtration system, wherein
The filtration system includes the filter element of multiple groups parallel connection, and each filter element includes shell, ash bucket and ceramic filter drum,
The lower part of the shell is connected to the top of the ash bucket, and air inlet, the top of the shell are offered on the ash bucket
Air outlet is offered, and the air outlet of the shell and the air inlet of the ash bucket are oppositely arranged；
The inner horizontal of the shell is provided with card, and the shell is separated into air-purifying chamber and the lower part on top by the card
Filter chamber；
More ceramic filter drums are distributed in matrix form, and the outlet side of the ceramic filter drum is embedded in the card, and with the net gas
Room connection, and the inlet end of the ceramic filter drum is connected to the filter chamber；
The distance between adjacent ceramic filter cylinder is 30~50mm.
2. Dedusting of EAF equipment according to claim 1, which is characterized in that the combustion chamber passes through water cooling sliding sleeve and electricity
The connection of arc furnace.
3. Dedusting of EAF equipment according to claim 1, which is characterized in that the Dedusting of EAF equipment further includes vehicle
Between roof cover, the workshop roof cover is located at the top of the electric arc furnaces.
4. Dedusting of EAF equipment according to claim 1, which is characterized in that the water-cooled flue and waste heat boiler connect
It is logical.
5. Dedusting of EAF method, which is characterized in that the dust removal method the following steps are included:
(1) flue gas that electric arc furnaces generates is passed through combustion chamber, settles the large dust particle in flue gas, and fire CO in flue gas sufficiently
It burns；
(2) by treated for step (1) combustion chamber, flue gas is passed through water-cooled flue cools down, and the temperature of flue gas is made to be reduced to 300
~600 DEG C；
(3) flue gas after cooling is passed through the ultra-clean pulse dust collector of high temperature resistant, makes the concentration of flue gas emission no more than 5mg/Nm3。
6. Dedusting of EAF method according to claim 5, which is characterized in that the flue gas that the electric arc furnaces of step (1) generates
The combustion chamber is passed through by water cooling sliding sleeve.
7. Dedusting of EAF method according to claim 5, which is characterized in that the dust removal method further includes with workshop room
Overhead guard absorbs the step of overflow flue gas in electric arc furnaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910332037.7A CN110030841A (en) | 2019-04-24 | 2019-04-24 | Dedusting of EAF equipment and dust removal method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910332037.7A CN110030841A (en) | 2019-04-24 | 2019-04-24 | Dedusting of EAF equipment and dust removal method |
Publications (1)
| Publication Number | Publication Date |
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| CN110030841A true CN110030841A (en) | 2019-07-19 |
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ID=67240018
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910332037.7A Pending CN110030841A (en) | 2019-04-24 | 2019-04-24 | Dedusting of EAF equipment and dust removal method |
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| CN (1) | CN110030841A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111643979A (en) * | 2020-06-22 | 2020-09-11 | 无锡红旗除尘设备有限公司 | Constant-temperature filtering and purifying device and method for high-temperature flue gas |
| CN112556417A (en) * | 2020-12-09 | 2021-03-26 | 张家港宏昌钢板有限公司 | Electric furnace smelting energy-saving equipment and use method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111643979A (en) * | 2020-06-22 | 2020-09-11 | 无锡红旗除尘设备有限公司 | Constant-temperature filtering and purifying device and method for high-temperature flue gas |
| CN111643979B (en) * | 2020-06-22 | 2023-07-11 | 无锡红旗除尘设备有限公司 | Constant-temperature filtering and purifying device and purifying method for high-temperature flue gas |
| CN112556417A (en) * | 2020-12-09 | 2021-03-26 | 张家港宏昌钢板有限公司 | Electric furnace smelting energy-saving equipment and use method thereof |
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