CN102234696A - Method of increasing air quantity when blast furnace blows in without damping down - Google Patents
Method of increasing air quantity when blast furnace blows in without damping down Download PDFInfo
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- CN102234696A CN102234696A CN2010101521544A CN201010152154A CN102234696A CN 102234696 A CN102234696 A CN 102234696A CN 2010101521544 A CN2010101521544 A CN 2010101521544A CN 201010152154 A CN201010152154 A CN 201010152154A CN 102234696 A CN102234696 A CN 102234696A
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Abstract
The invention relates to a method of increasing air quantity when blast furnace blows in without damping down, characterized by that: using all tuyeres to supply air, adding fireproof sleeves on all tuyeres when the blast furnace blows in, taking off the sleeves gradually to increase the area of the tuyeres with the air quantity increases until all sleeves are taken off to keep the air speed and the kinetic energy at a required level, wherein, the sleeves are taken off without damping down. With small air quantity in the initial stage of blow-in, the air supplying with all tuyeres is realized, thus in the initial stage of blow-in the distributions of initial gas stream and temperature are reasonable, and the working condition of the hearth is uniform, active and stable. When the increasing of the air quantity is required, the increasing of the air quantity is realized by gradually poking the ceramic sleeves to increase the area of the tuyeres to keep the air speed and the kinetic energy at a resonable level, and the process of poking the ceramic sleeves is carried out without damping down, with being good for blast furnace blowing-in and reaching design capacity rapidly.
Description
Technical field
Not damping down, the method that do not stop production when the present invention relates to blast furnace opening and increasing air quantity belong to technical field of blast furnace process.
Background technology
Blast-furnace smelting requires under certain heat size and certain crude fuel condition, and the wind speed of blast furnace and blast energy must reach certain value, otherwise may cause that conditions of blast furnace has some setbacks, and the production technology economic target is poor.Therefore blowing system is to influence the key factor that blast furnace original coal air-flow distributes, and particularly rational blowing system of blast furnace opening initial stage will promote the recovery of the working of a furnace.Coal gas stream before the air port is emission center with the district of circling round, and expands to the center to both sides and along major diameter along minor axis.The blast energy in size, the degree of depth, distribution and each air port in district of circling round has confidential relation, and directly influences the distribution of original coal air-flow and temperature, be furnace cylinder working can evenly enliven basic and crucial.
Blast furnace opening initial stage air quantity is less than normal, is generally the air quantity of 50-60% under the nominal situation.Existing method is the air port air-supply of directly enabling 50-60%, and the air port of remaining 40-50% is then closed, and the measure of closing is normally stopped up with refractory mortar.Air quantity will progressively improve in the subsequent production process, and the air-supply air port of closing before will progressively recovering promptly needs to disclose mouthful interior refractory mortar that stops up that blows in.In order to block the air port fully, refractory mortar is very thick usually, and hardens with the air port and to be in the same place, disclose out it and be not easy very much, must handle by damping down in this case, operation is not only required great effort time-consuming like this, and influencing furnace condition recovery, influence is produced, so blast furnace is abstained from damping down most.In addition, the local mode of stopping up the air port can cause blast furnace opening initial stage original coal air-flow and temperature distribution unreasonable, the problem of furnace cylinder working state inequality occurs.
Improvement along with the crude fuel condition, implement oxygen-enriched coal spray and technical progress etc., the utilization ratio of blast furnace wind improves, the invisible waste of smelting the unit pig iron reduces, total air quantity reduces, and will dwindle the tuyere small sleeve diameter for keeping certain wind speed and blast energy, and the major diameter tuyere small sleeve of buying before just can't use, if these major diameter tuyere small sleeves are all scrapped, loss can be very big.
Summary of the invention
At the prior art above shortcomings, the purpose of this invention is to provide that a kind of blast furnace opening initial stage original coal air-flow distributes rationally, furnace cylinder working state not damping down, method of not stopping production of blast furnace evenly and when needs increase air quantity.
Technical scheme of the present invention is achieved in that blast furnace opening increases the not method of damping down of air quantity, present method adopts the mode of whole air ports air-supply, in all tuyere small sleeves, set up a cover of making of refractory materials during blast furnace opening earlier on the circle, with the actual cross-sectional area sum S1 that reduces the actual inner diameter in air port, make to reduce all air ports, back with reduce before under the ratio S1/S of cross-sectional area sum S in all air ports and blast furnace opening initial stage air quantity T1 and the nominal situation ratio T1/T of air quantity T adapt; Along with the increase of air quantity, progressively take down cover to increase the air port incoming air area up to all covers are taken down, wind speed and blast energy are remained on needs level, takes down cover and takes not the damping down mode to carry out.
The air port cross-sectional area reduced in proportion after all air ports were provided with cover.
Described cover is a ceramic jacket, and the mode that takes down cover is for disclosing broken ceramic jacket.
Compared to existing technology, the present invention has following advantage:
1, owing to all is provided with the cover that refractory materials is made in all tuyere small sleeves, the air port real area reduces, satisfying under the blow-on initial stage air quantity prerequisite less than normal, realized the air-supply of whole air ports, therefore blow-on initial stage original coal air-flow and temperature distribution are reasonable, and the furnace cylinder working state is even, active and stable.
2, when needs increase air quantity, progressively disclosing broken ceramic jacket increases the air port incoming air area and gets final product, and makes wind speed and blast energy remain on reasonable level, takes not damping down (stopping production) mode to carry out and disclose broken ceramic jacket, and what help blast furnace opening reaches product fast.
3, can utilize the major diameter tuyere small sleeve, thereby avoid the meaningless of major diameter tuyere small sleeve to scrap, save production cost.
Embodiment
The present invention adopts the mode of whole air ports air-supply, sets up a cover of making of refractory materials during blast furnace opening earlier on the circle in all tuyere small sleeves, to reduce the actual inner diameter in air port.The air port cross-sectional area reduced in proportion after all air ports were provided with cover, the actual cross-sectional area sum S1 that reduces all air ports, back with reduce before under ratio (being S1/S) and the blast furnace opening initial stage air quantity T1 of cross-sectional area sum S in all air ports and the nominal situation ratio (being T1/T) of air quantity T adapt, therefore can reach the air supply parameter of regulation, reach the wind speed and the blast energy of regulation.Along with the increase of air quantity, progressively take down cover to increase the air port incoming air area up to all covers are taken down, wind speed and blast energy are remained on needs level.
Fire-resistant cover material is selected refractory materialss such as silicon carbide for use, the inclined to one side hard material of hardness, and the refractoriness that requires fire-resistant cover is greater than 1790 ℃, and anti-rapid heat cycle ability is strong.During practice, cover of the present invention is silicon carbide (i.e. a pottery), take down the cover period of the day from 11 p.m. to 1 a.m and directly disclose broken ceramic jacket and get final product, specifically disclose broken method and be: with air-supply arrangement that the air port is connected on be provided with a hole, this hole communicates with ceramic jacket, this hole is covered at ordinary times, when needs are disclosed broken ceramic jacket, the hole is opened, from the outside with disclosing cover with strength with the hard thing of sharp tip (as firm pricker etc.), potsherd directly enters blast furnace, so this method takes down cover and can take not the damping down mode to carry out.
The air port adds one of effect of cover: add ceramic jacket during blast furnace opening to reduce incoming air area in tuyere small sleeve, adopt the air-supply of whole air ports, satisfy the requirement less than normal of blow-on initial stage air quantity; Along with the increase of air quantity, disclose broken ceramic jacket gradually to increase the air port incoming air area, make wind speed and blast energy remain on reasonable level, disclose broken ceramic jacket and take not damping down (stopping production) mode to carry out, what help blast furnace opening reaches product fast.Two of effect: adopt whole air ports air supply mode, solved local stifled air port of blast furnace opening initial stage and caused original coal air-flow irrational distribution, the problem of furnace cylinder working state inequality.Three of effect: the major diameter air port is added cover use the tuyere small sleeve that digestion should be scrapped after the diameter reduction.As improvement along with the crude fuel condition, implement oxygen-enriched coal spray and technical progress etc., the utilization ratio of blast furnace wind improves, the invisible waste of smelting the unit pig iron reduces, total air quantity reduces, and will dwindle the tuyere small sleeve diameter for keeping certain wind speed and blast energy, and the major diameter tuyere small sleeve of buying before just can't use, should scrap, utilize the air port to add cover and can utilize the major diameter tuyere small sleeve.This fire-resistant cover requires the refractory temperature height, can bear rapid heat cycle and not break etc.Certain blast furnace is through accumulation for many years in the production, and existing φ 140mm tuyere small sleeve is more than 40, and this blast furnace is now only with the following tuyere small sleeve of φ 135mm, if these major diameter tuyere small sleeves are scrapped, lose very greatly, it is worth about 500,000 yuan, just can avoid this problem and the air port adds cover.
Claims (3)
1. blast furnace opening increases the not method of damping down of air quantity, it is characterized in that: present method adopts the mode of whole air ports air-supply, in all tuyere small sleeves, set up a cover of making of refractory materials during blast furnace opening earlier on the circle, with the actual cross-sectional area sum S1 that reduces the actual inner diameter in air port, make to reduce all air ports, back with reduce before under the ratio S1/S of cross-sectional area sum S in all air ports and blast furnace opening initial stage air quantity T1 and the nominal situation ratio T1/T of air quantity T adapt; Along with the increase of air quantity, progressively take down cover to increase the air port incoming air area up to all covers are taken down, wind speed and blast energy are remained on needs level.
2. blast furnace opening according to claim 1 increases the not method of damping down of air quantity, and it is characterized in that: the air port cross-sectional area reduced in proportion after all air ports were provided with cover.
3. blast furnace opening according to claim 1 and 2 increases the not method of damping down of air quantity, and it is characterized in that: described cover is a ceramic jacket, and the mode that takes down cover is for disclosing broken ceramic jacket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101521544A CN102234696A (en) | 2010-04-21 | 2010-04-21 | Method of increasing air quantity when blast furnace blows in without damping down |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101521544A CN102234696A (en) | 2010-04-21 | 2010-04-21 | Method of increasing air quantity when blast furnace blows in without damping down |
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| Publication Number | Publication Date |
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| CN102234696A true CN102234696A (en) | 2011-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101521544A Pending CN102234696A (en) | 2010-04-21 | 2010-04-21 | Method of increasing air quantity when blast furnace blows in without damping down |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605124A (en) * | 2012-04-16 | 2012-07-25 | 宗品禾 | Blast furnace reducing tuyere short set |
| CN111378800A (en) * | 2018-12-31 | 2020-07-07 | 新疆八一钢铁股份有限公司 | Method for randomly adjusting air inlet area of blast furnace tuyere |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2138127Y (en) * | 1992-11-05 | 1993-07-14 | 李树灿 | Hollow circular tuyere of blast furnace |
| CN2797375Y (en) * | 2005-04-21 | 2006-07-19 | 宝钢集团上海梅山有限公司 | Reducing sleeve for tuyere of blast furnace |
-
2010
- 2010-04-21 CN CN2010101521544A patent/CN102234696A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2138127Y (en) * | 1992-11-05 | 1993-07-14 | 李树灿 | Hollow circular tuyere of blast furnace |
| CN2797375Y (en) * | 2005-04-21 | 2006-07-19 | 宝钢集团上海梅山有限公司 | Reducing sleeve for tuyere of blast furnace |
Non-Patent Citations (2)
| Title |
|---|
| 《炼铁》 19841231 李国信 高炉风口风量自动调节方法 79 1-3 , 第3期 * |
| 王宏启 等: "《高炉炼铁设备》", 30 April 2008, article "高炉炼铁设备", pages: 59-61 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605124A (en) * | 2012-04-16 | 2012-07-25 | 宗品禾 | Blast furnace reducing tuyere short set |
| CN111378800A (en) * | 2018-12-31 | 2020-07-07 | 新疆八一钢铁股份有限公司 | Method for randomly adjusting air inlet area of blast furnace tuyere |
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Application publication date: 20111109 |