CN208920881U - Flue gas purification system in continuous charging arc furnace - Google Patents
Flue gas purification system in continuous charging arc furnace Download PDFInfo
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- CN208920881U CN208920881U CN201821329158.3U CN201821329158U CN208920881U CN 208920881 U CN208920881 U CN 208920881U CN 201821329158 U CN201821329158 U CN 201821329158U CN 208920881 U CN208920881 U CN 208920881U
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- flue
- flue gas
- cooling tower
- heat preservation
- purification system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The utility model relates to flue gas purification systems in continuous charging arc furnace.The flue gas purification system, comprising: watercooling elbow, one end are connected to the sealing of the smoke outlet of the scrap steel preheating section of electric arc furnaces；Expansion chamber, wherein the other end sealing of watercooling elbow is passed through expansion chamber；It is arranged to the heat preservation flue with lower end and higher-end, wherein the lower end of heat preservation flue is connected to the top seal of expansion chamber；Evaporative cooling tower with smoke inlet and exhanst gas outlet, wherein the higher-end of heat preservation flue is connected to the sealing of the smoke inlet of evaporative cooling tower；Sack cleaner has smoke inlet and exhanst gas outlet, and wherein the smoke inlet of deduster is connected to the exhanst gas outlet of evaporative cooling tower by being provided with the pipeline of mixer selector valve；And tapping equipment, it is connected to the exhanst gas outlet of deduster.The content of the toxic carcinogen of dioxin greatly reduces in the purified flue gas of the utility model；Also significantly reduce cooling water requirement.
Description
Technical field
The utility model relates to gas cleaning systems in flue gases purification field more particularly to continuous charging arc furnace
System.
Background technique
Electric arc furnaces can generate a large amount of high-temperature flue gas in smelting process, in flue gas there are also dust etc. harmful substances.Especially
It is the electric arc furnaces of continuous charging, such as Kang Sidi electric furnace, steel scrap is preheated in continuous charging system by high-temperature flue gas, although saving
Mass energy, but the new environmental problem of also the same band, objectionable impurities is contacted with high-temperature flue gas in steel scrap, can be produced largely
The pernicious gases such as dioxin.How electric arc furnaces inner flue gas of the stove is purified, so that it is granular material discharged up to standard in flue dust, and disappear
Except harmful substances such as the dioxin generated during scrap steel preheating, it is always electric arc furnaces that especially the sternness of environmental protection situation is current
The problem of smelting enterprise.
Utility model content
In order to solve the problems, such as above-mentioned all or part, the utility model, which provides one kind, can make two evil in purified flue gas
The content of the toxic carcinogen of English greatly reduces；Also significantly reduce the flue gases purification of cooling water requirement.
It is according to the present utility model in a first aspect, provide flue gas purification system in a kind of continuous charging arc furnace,
It include: watercooling elbow, one end is connected to the sealing of the smoke outlet of the scrap steel preheating section of the electric arc furnaces, is reduced flue-gas temperature, is prevented
The too high calcination transport pipeline of flue-gas temperature；Expansion chamber makes wherein the other end sealing of the watercooling elbow is passed through the expansion chamber
The flue dust for obtaining bulky grain in flue gas sinks, and reduction deposits in sack cleaner；Heat preservation flue with lower end and higher-end,
Wherein the lower end of the heat preservation flue is connected to the top seal of the expansion chamber, is increased the fume high-temperature time, is improved flue gas
The resolution ratio of the middle toxic carcinogen of dioxin；Evaporative cooling tower with smoke inlet and exhanst gas outlet, wherein the guarantor
The higher-end of warm flue is connected to the sealing of the smoke inlet of the evaporative cooling tower；Sack cleaner, have smoke inlet and
Exhanst gas outlet, wherein the smoke inlet of the sack cleaner is connected to the sealing of the exhanst gas outlet of the evaporative cooling tower；With
And tapping equipment, it is connected to the exhanst gas outlet of the sack cleaner.
In further technical solution, multiple compressed air intakes have been can be set in the sack cleaner top, and
Its underpart is correspondingly arranged on multiple dust funnels.That is, multiple compressed air intakes and multiple dusts leak
Bucket is arranged in a one-to-one correspondence.
In further technical solution, which can also include conveyer and ash-storing bin, wherein described defeated
Device is sent to be arranged below multiple dust funnels, for sending the dust collected thereon to the ash-storing bin.In this case,
It can also include bucket elevator, dust is submitted in the ash-storing bin from the conveyer.
In further technical solution, the tapping equipment includes smoke exhaust fan and chimney, the evaporative cooling tower
Exhanst gas outlet successively seals the connection smoke exhaust fan and chimney.
In further technical solution, the smoke inlet of the sack cleaner and the flue gas of the evaporative cooling tower go out
Sealing is provided with and communicated with the pipeline of mixer selector valve between mouthful.
In further technical solution, the heat preservation flue is the internal flue for being equipped with refractory material.
Second aspect according to the present utility model provides flue gas purifying method in a kind of continuous charging arc furnace,
It include: that the flue gas of the smoke outlet of the scrap steel preheating section from the electric arc furnaces is entered to expansion chamber after watercooling elbow；It will be
Flue gas in the expansion chamber after settling pre- dedusting passes through heat preservation flue again and enters evaporative cooling tower；It will be from the evaporation
The flue gas that formula cooling tower comes out introduces sack cleaner；And the flue gas come out from the sack cleaner is sent into discharge dress again
It sets.
In further technical solution, the flue-gas temperature near the smoke outlet of the scrap steel preheating section of the electric arc furnaces is 700-
1000℃；And flue gas is cooled to 200-250 DEG C in the evaporative cooling tower with 200-400 DEG C/s.
In further technical solution, when the flue-gas temperature for entering the sack cleaner is more than the first set temperature,
Mixer selector valve automatically opens；And when the flue-gas temperature for entering the sack cleaner is down to the second set temperature, mixer selector valve is certainly
It is dynamic to close.First set temperature is preferably 230 DEG C, and the second set temperature is preferably 200 DEG C.
In further technical solution, the sack cleaner uses high temperature resistance filtration material, and filter area reaches 11000 ㎡.
Flue gas purification system and the utility model in continuous charging arc furnace described in the utility model first aspect
Flue gas purifying method can be cooling by setting heat preservation flue and vaporation-type in continuous charging arc furnace described in two aspects
Tower makes flue gas by heat preservation and quenching, reduces the toxic carcinogen of dioxin in flue gas.Electric arc furnaces institute in smelting process
Generate a large amount of high-temperature flue gas pass sequentially through watercooling elbow, expansion chamber, heat preservation flue, evaporative cooling tower, sack cleaner and
Tapping equipment.Flue gas enters expansion chamber by watercooling elbow, carries out settling pre- dedusting to particulate matter in flue gas in expansion chamber；Cigarette
Gas passes through heat preservation flue again and enters evaporative cooling tower, and the toxic carcinogen of dioxin is divided substantially in heat preservation flue in flue gas
Solution is destroyed, and for evaporative cooling tower quickly by flue gas cool-down (chilling), the synthesis for shortening the toxic carcinogen of dioxin in flue gas is anti-
Between seasonable, that is, the production toxic carcinogen of dioxin is reduced, is very beneficial for protecting environment；Flue gas finally enters pocket type and removes
Dirt device carries out refined dedusting, then carries out high altitude discharge by tapping equipment.Wherein, in the continuous charging arc furnace of the utility model
Flue gas purification system uses heat preservation flue and evaporative cooling tower and also reduces water so that cooling water requirement substantially reduces
The construction cost and water process operating cost for the treatment of facility.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar
Element or part are generally identified by similar appended drawing reference.In attached drawing, each element or part might not be according to actual ratios
It draws.
Fig. 1 shows the schematic diagram of the flue gas purification system of the utility model embodiment.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solutions of the utility model.Following embodiment is only
For clearly illustrating the technical solution of the utility model, therefore it is only used as example, and it is originally practical to cannot be used as a limitation limitation
Novel protection scope.
Fig. 1 shows flue gas purification system 100 in the continuous charging arc furnace of the utility model embodiment.Such as Fig. 1 institute
Show, the flue gas purification system 100 of the utility model embodiment its specifically include that watercooling elbow 2, expansion chamber 3, heat preservation flue 4, steam
Hairdo cooling tower 5, sack cleaner 6 and tapping equipment.The smoke evacuation of the scrap steel preheating section of one end and electric arc furnaces of watercooling elbow 2
1 sealing connection of mouth, other end sealing are passed through expansion chamber 3.Heat preservation flue 4 is arranged to keep the temperature cigarette with lower end and higher-end
The lower end in road 4 is connected to the top seal of expansion chamber 3, keeps the temperature the higher-end of flue 4 and the smoke inlet of evaporative cooling tower 5
Sealing connection.Sack cleaner 6 has smoke inlet and exhanst gas outlet, wherein the flue gas of smoke inlet and evaporative cooling tower 5
Exit seal connection, exhanst gas outlet are connected with tapping equipment.
Flue gas purification system 100 and the utility model second in the continuous charging arc furnace of the utility model first aspect
Flue gas purifying method can be made by setting heat preservation flue 4 and evaporative cooling tower 5 in the continuous charging arc furnace of aspect
Flue gas reduces the toxic carcinogen of dioxin in flue gas by heat preservation and quenching.Produced by electric arc furnaces is in smelting process
A large amount of high-temperature flue gas pass sequentially through watercooling elbow 2, expansion chamber 3, heat preservation flue 4, evaporative cooling tower 5,6 and of sack cleaner
Tapping equipment.Flue gas enters expansion chamber 3 by watercooling elbow 2, carries out settling pre- remove to particulate matter in flue gas in expansion chamber 3
Dirt, wherein can also be equipped with warmer in expansion chamber 3, when flue-gas temperature is less than 700 DEG C, warmer is automatically opened, when flue gas temperature
Degree is automatically closed when being greater than 750 DEG C, guarantees that the temperature before flue gas enters heat preservation flue is greater than 700 DEG C；Flue gas passes through heat preservation cigarette again
Road 4 enters evaporative cooling tower 5, and heat preservation flue 4 is the internal flue for being equipped with refractory material, not only anti-calcination but also heat preservation.In flue gas
The toxic carcinogen of dioxin is decomposed destructions substantially in heat preservation flue 4, and evaporative cooling tower 5 is quickly by flue gas cool-down (urgency
It is cold), the synthesising reacting time of the toxic carcinogen of dioxin in flue gas is shortened, that is, reduce the production toxic carcinogenic substance of dioxin
Matter is very beneficial for protecting environment；Flue gas finally enters sack cleaner 6 and carries out refined dedusting, then carries out height by tapping equipment
Idle discharge is put.Wherein, flue gas purification system uses heat preservation flue 4 and vaporation-type in the continuous charging arc furnace of the utility model
Cooling tower 5 so that cooling water requirement substantially reduces, also reduce water processing establishment construction cost and water process operation at
This.
There is deviation in the use temperature and design temperature of sack cleaner 6, can lead to serious consequence, must to high-temperature gas
The temperature that filtrate can be born or less must be cooled to；And condense in order to prevent, gas temperature preferably must be held in dew point (in air
Middle moisture content is constant, and under the feelings for keeping air pressure certain, temperature when making air is cooling to reach saturation claims dew-point temperature, referred to as reveals
Point) more than.In the present embodiment, the company of sealing between the smoke inlet of sack cleaner 6 and the exhanst gas outlet of evaporative cooling tower 5
The logical pipeline for being provided with mixer selector valve 7.When the flue-gas temperature for entering sack cleaner 6 is more than the first set temperature, mixer selector valve 7 is certainly
It is dynamic to open, so that wild wind enters, the temperature of flue gas is down to the second set temperature, mixer selector valve 7 is automatically closed.Guarantee to enter pocket type
The temperature that the flue-gas temperature of deduster 6 can not only be born in filtrate is hereinafter, but also more than dew point.Under normal circumstances, High Temperature Gas is handled
6 investment cost of sack cleaner used in body is higher, and air cooling facility (such as evaporative cooling tower 5) is also required to funds.This
Temperature that utility model is formed according to the production process, air quantity determine cooling means, and consider the size ruler of sack cleaner 6
It is very little, make most economical treatment temperature.Above-mentioned first set temperature is preferably set to 230 DEG C, and the second set temperature is preferably set
It is set to 200 DEG C.Mixer selector valve 7, which is arranged, controls the temperature into the flue gas of sack cleaner 6 at 200~230 DEG C, increases pocket type
The job stability of deduster 6.
The top of sack cleaner 6 is provided with multiple compressed air intakes, and its underpart is correspondingly arranged on multiple dusts
Funnel.Above-mentioned compressed air intake is arranged in a one-to-one correspondence with dust funnel, accelerates the working efficiency of sack cleaner 6.Pocket type
Deduster 6 can be preferably Low-Pressure Pulse Bag Filter.Arranging in a row the one of sack cleaner 6 can also be arranged below dirt funnel
Conveyer 10, the dust that dust funnel is leaked down are sent at bucket elevator 11 and by it by conveyer 10 and are re-fed into ash-storing bin 12,
Improve the automatization level of flue gas purification system 100.Above-mentioned sack cleaner 6 can use high temperature resistance filtration material, and filter area can
Reach 11000m2, improve the filter effect to flue gas.
Tapping equipment includes smoke exhaust fan 8 and chimney 9, and the flue gas from sack cleaner 6 is discharged into chimney by smoke exhaust fan 8
9 to be discharged.Above-mentioned smoke exhaust fan 8 can carry out variable speed energy saving using frequency converter, to meet tapping equipment difference operating condition
The requirement of downdraft variation, it is energy-saving to achieve the purpose that.
The purifying step of the flue gas purification system of the utility model is briefly described below.With 220 tons of continuous charging Kang Sidi
For electric arc furnaces, inner flue gas of the stove amount is not all 200000-300000Nm according to material type3/ h, flue-gas temperature are 1000-1200 DEG C,
Dust contained flue gas concentration is about 8g/Nm3。
When high-temperature flue gas passes through Kang Sidi continuous charging, steel scrap is preheated, the temperature at the smoke outlet 1 of scrap steel preheating section
Degree is 700-1000 DEG C.High-temperature flue gas is settled by watercooling elbow 2 into 20m × 7m × 10m expansion chamber 3, is being settled
Flue gas in room 3 after 1-2s settles pre- dedusting passes through heat preservation flue 4 again and enters evaporative cooling tower 5, cooling in vaporation-type
Flue-gas temperature is chilled to 200-250 DEG C with the rate of 200-400 DEG C/s in tower 5.Flue gas after rapid cooling enters pocket type and removes
Dirt device 6 carries out refined dedusting.Low-temperature flue gas amount after cooling, dedusting are up to standard is 70-75 × 104m3/ h, by 1750kW variable-frequency motor
Smoke exhaust fan 8 is driven to carry out high altitude discharge by the chimney 9 that height is 28-30m.Wherein, when flue-gas temperature is abnormal and is more than cloth
At 230 DEG C of the highest setting temperature of bag dust collector 6, the mixer selector valve 7 of 6 upstream of bag filter, which automatically opens, is mixed into wild wind；Work as cigarette
When temperature degree is down to 200 DEG C, mixer selector valve 7 is automatically closed.
Embodiment one
Temperature at the smoke outlet 1 of scrap steel preheating section is 700 DEG C, high-temperature flue gas by watercooling elbow 2 enter expansion chamber 3 into
Row settles pre- dedusting, then enters evaporative cooling tower 5 by heat preservation flue 4, and heat preservation flue 4 makes the toxic cause of dioxin in flue gas
Cancer substance is decomposed destruction substantially, and evaporative cooling tower 5 is chilled to 200 DEG C with the rate of 200 DEG C/s, shortens dioxin in flue gas
The synthesising reacting time of toxic carcinogen, that is, reduce the production toxic carcinogen of dioxin.Cigarette after rapid cooling
Gas enters sack cleaner 6 and carries out refined dedusting, and last flue-gas temperature is 76 DEG C, dust content 8.2mg/Nm3, contain dioxin
0.38mg/Nm3, reach discharge standard.
Embodiment two
Temperature at the smoke outlet 1 of scrap steel preheating section is 900 DEG C, high-temperature flue gas by watercooling elbow 2 enter expansion chamber 3 into
Row settles pre- dedusting, then enters evaporative cooling tower 5 by heat preservation flue 4, and heat preservation flue 4 makes the toxic cause of dioxin in flue gas
Cancer substance is decomposed destruction substantially, and evaporative cooling tower 5 is chilled to 210 DEG C with the rate of 300 DEG C/s, shortens dioxin in flue gas
The synthesising reacting time of toxic carcinogen, that is, reduce the production toxic carcinogen of dioxin.Cigarette after rapid cooling
Gas enters sack cleaner 6 and carries out refined dedusting, and last flue-gas temperature is 79 DEG C, dust content 8.9mg/Nm3, have containing dioxin
Malicious carcinogen 0.42mg/Nm3, reach discharge standard.
Embodiment three
Temperature at the smoke outlet 1 of scrap steel preheating section is 1000 DEG C, and high-temperature flue gas enters expansion chamber 3 by watercooling elbow 2
It carries out settling pre- dedusting, then evaporative cooling tower 5 is entered by heat preservation flue 4, heat preservation flue 4 makes dioxin in flue gas toxic
Carcinogen is decomposed destruction substantially, and evaporative cooling tower 5 is chilled to 228 DEG C with the rate of 400 DEG C/s, shortens in flue gas two and dislikes
The synthesising reacting time of the toxic carcinogen of English, that is, reduce the production toxic carcinogen of dioxin.After rapid cooling
Flue gas enters sack cleaner 6 and carries out refined dedusting, and last flue-gas temperature is 83 DEG C, dust content 8.6mg/Nm3, contain dioxin
Toxic carcinogen 0.41mg/Nm3, reach discharge standard.
Example IV
Temperature at the smoke outlet 1 of scrap steel preheating section is 1022 DEG C, and high-temperature flue gas enters expansion chamber 3 by watercooling elbow 2
It carries out settling pre- dedusting, then evaporative cooling tower 5 is entered by heat preservation flue 4, heat preservation flue 4 makes dioxin in flue gas toxic
Carcinogen is decomposed destruction substantially, and evaporative cooling tower 5 is chilled to 260 DEG C with the rate of 400 DEG C/s, shortens in flue gas two and dislikes
The synthesising reacting time of the toxic carcinogen of English, that is, reduce the production toxic carcinogen of dioxin.Because 260 DEG C greater than 230
DEG C, the mixer selector valve 7 of 6 upstream of bag filter, which automatically opens, is mixed into wild wind, and when flue-gas temperature is down to 200 DEG C, mixer selector valve 7 is automatic
It closes, the flue gas after rapid cooling enters sack cleaner 6 and carries out refined dedusting, and last flue-gas temperature is 85 DEG C, dust content
For 7.9mg/Nm3, the toxic carcinogen 0.47mg/Nm containing dioxin3, reach discharge standard.
It should be noted that unless otherwise indicated, the technical term or scientific term that the utility model uses are should be
The ordinary meaning that the utility model one of ordinary skill in the art are understood.The meaning of " multiple " in the description of the present invention,
It is two or more, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, the terms such as term " connected ", " connection " should be done extensively
Reason and good sense solution may be a detachable connection for example, it may be being fixedly connected, or integral；It can be mechanical connection, it can also be with
It is electrical connection；Can be directly connected, can also indirectly connected through an intermediary, can be connection inside two elements or
The interaction relationship of two elements.For the ordinary skill in the art, can understand as the case may be above-mentioned
The concrete meaning of term in the present invention.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type, should all cover in the claim of the utility model and the range of specification.
Especially, as long as structural conflict is not present, items technical characteristic mentioned in the various embodiments can combine in any way
Get up.The utility model is not limited to specific embodiment disclosed herein, but including falling within the scope of the appended claims
All technical solutions.
Claims (6)
1. flue gas purification system in a kind of continuous charging arc furnace characterized by comprising
Watercooling elbow, one end are connected to the sealing of the smoke outlet of the scrap steel preheating section of the electric arc furnaces；
Expansion chamber, wherein the other end sealing of the watercooling elbow is passed through the expansion chamber；
Heat preservation flue with lower end and higher-end, wherein the lower end of the heat preservation flue and the top of the expansion chamber are close
Envelope connection；
Evaporative cooling tower with smoke inlet and exhanst gas outlet, wherein the higher-end of the heat preservation flue and the vaporation-type
The smoke inlet of cooling tower seals connection；
Sack cleaner has smoke inlet and exhanst gas outlet, wherein the smoke inlet of the sack cleaner and the evaporation
The exhanst gas outlet of formula cooling tower seals connection；And
Tapping equipment is connected to the exhanst gas outlet of the sack cleaner.
2. flue gas purification system according to claim 1, which is characterized in that be provided on the top of the sack cleaner
Multiple compressed air intakes, and its underpart is correspondingly arranged on multiple dust funnels.
3. flue gas purification system according to claim 2, which is characterized in that it further include conveyer and ash-storing bin, wherein institute
It states conveyer to be arranged below multiple dust funnels, for sending the dust collected thereon to the ash-storing bin.
4. flue gas purification system according to claim 1, which is characterized in that the tapping equipment includes smoke exhaust fan and cigarette
Chimney, the exhanst gas outlet of the evaporative cooling tower successively seal the connection smoke exhaust fan and chimney.
5. flue gas purification system according to claim 1, which is characterized in that the smoke inlet of the sack cleaner and institute
State the pipeline that sealing between the exhanst gas outlet of evaporative cooling tower is provided with and communicated with mixer selector valve.
6. flue gas purification system according to claim 1, which is characterized in that the heat preservation flue is internal equipped with fire proofed wood
The flue of material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821329158.3U CN208920881U (en) | 2018-08-16 | 2018-08-16 | Flue gas purification system in continuous charging arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821329158.3U CN208920881U (en) | 2018-08-16 | 2018-08-16 | Flue gas purification system in continuous charging arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208920881U true CN208920881U (en) | 2019-05-31 |
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ID=66702804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821329158.3U Active CN208920881U (en) | 2018-08-16 | 2018-08-16 | Flue gas purification system in continuous charging arc furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827013A (en) * | 2018-08-16 | 2018-11-16 | 江苏久华环保科技股份有限公司 | Flue gas purification system and method in continuous charging arc furnace |
-
2018
- 2018-08-16 CN CN201821329158.3U patent/CN208920881U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827013A (en) * | 2018-08-16 | 2018-11-16 | 江苏久华环保科技股份有限公司 | Flue gas purification system and method in continuous charging arc furnace |
| CN108827013B (en) * | 2018-08-16 | 2024-03-15 | 江苏零碳再生资源科技有限公司 | System and method for purifying flue gas in continuous charging electric arc furnace |
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