CN102605123A - Method for controlling smelting intensity of blast furnace by using air inlet linings - Google Patents
Method for controlling smelting intensity of blast furnace by using air inlet linings Download PDFInfo
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- CN102605123A CN102605123A CN2011104080783A CN201110408078A CN102605123A CN 102605123 A CN102605123 A CN 102605123A CN 2011104080783 A CN2011104080783 A CN 2011104080783A CN 201110408078 A CN201110408078 A CN 201110408078A CN 102605123 A CN102605123 A CN 102605123A
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- air port
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Abstract
The invention discloses a method for controlling the smelting intensity of a blast furnace by using air inlet linings and belongs to the technical field of blast furnace ironmaking. The method comprises the following technical steps of: calculating the number of the air inlet linings, determining the mounting positions of the air inlet linings, and mounting and detaching the air inlet linings. The method has the advantages that air inlet small linings are arranged simultaneously at one or more air inlets, and the areas of the air inlets of a blast furnace are adjusted through the air inlet small linings, so the aim of adjusting the yield of the blast furnace is fulfilled, and the effects of shortening the areas of the air inlets and controlling the smelting intensity are achieved. The method is practical and simple in a manufacturing process. The areas of the air inlets can be flexibly adjusted by the method. The service life of the blast furnace is long.
Description
Technical field
The invention belongs to technical field of blast furnace ironmaking, a kind of method with air port lining control smelting strength of blast furnace particularly is provided, come to adjust flexibly the air port area, thereby realize smelting strength of blast furnace control through the different air port lining of internal diameter.
Background technology
Since 2008, the steel market is severe, and each big steel of the whole nation is all reducing pig iron output.Generally speaking, realize the output reduction through the air port that stifled quantity does not wait, or change the littler air port of area and prolong the scheduled overhaul time, the measure realization underproduction such as unplanned blowing-out.More than several kinds of modes, stifled air port is prone to cause blast furnace circumference air quantity uneven, influence bottom house and adjusts, and causes blast furnace furnace wall temperature distributing disproportionation, causes the fluctuation of blast furnace thermal system, causes blast wandering, in the time of seriously the furnace wall dross can take place; Long-time blowing out then makes the production of full factory be in standstill state, changes the small area air port, need order from producer; Production cycle is that some months does not wait, and takies substantial contribution, in case come into operation; Air port area and diameter are just fixing, turn area once more down, can only continue customized; This method air port area adjustment is very clumsy, dumb.
Summary of the invention
The object of the present invention is to provide a kind of method with air port lining control smelting strength of blast furnace; Adapted to the fluctuation of current Market Situation to the molten iron throughput requirements fluctuated and blast furnace production requirement along steady demand; Through increasing tuyere small sleeve simultaneously in one or several air port; Utilize tuyere small sleeve to adjust the blast-furnace tuyere area, to realize the purpose of furnace processor adjustment, to have played dwindling the effect of air port area control combustion intensity.This method is practical, manufacture craft is simple, the air port area of can adjusting flexibly is big or small, and the life-span is long.
According to the amplitude of blast furnace reduction combustion intensity, confirm that the air port adds the size and the respective numbers of cover, then according to the even situation of blast-furnace tuyere state, select suitable air port to install.
The process step of its control combustion intensity is following:
(1) quantity of the required air port of calculating lining:
Require to confirm air quantity Q according to output
Wind, air quantity Q
WindConfirm that the back keeps air port wind speed V
WindConstant, determine air port total area F according to the air quantity formula
1,
V
Wind=Q
Wind/ (F
1* 60)
V
Wind-standard state leeward one's intention as revealed in what one says speed, m/s;
F
1-air port the total area;
Q
Wind-air quantity, m3/min;
If the former air port total area is F
0, the tuyere small sleeve internal diameter is r, its area S=π r
2, the tuyere small sleeve n=(F that accelerates
0-F
1)/S, n round number.
(2) confirm lining installation site, air port:
According to air port circumference working order, confirm that the air port is bright, working order is good air port for adding the cover air port, press circumferential direction symmetrical distribution installation;
(3) air port lining installation and removal:
Because the air port lining only need utilize the damping down chance to be contained in inlet front end when installing, the recovery of just can blowing fast in 1 hour.Mean life was above 100 days; When needing to improve output; Can not accomplish under damping down, the checking situation at blast furnace; With reference to wind speed, kinetic energy progressively the add-back air quantity air port lining gradation disclosed out, avoided changing the working of a furnace fluctuation that brings for a long time in the air port, before and after it is changed blast furnace operating with do not have significant difference habitually in the past.
(4) air port adds combustion intensity control and the organization of production behind the cover:
1. after using the air port lining that contracts, the air port area reduces, and blast furnace full blast air quantity reduces with equal proportion, 20-30 ℃ of reason combustion temperature decline, and wind speed is more than 260m/s, and blast furnace has guaranteed that air quantity can blow the blast furnace stock column, has guaranteed the direct motion of blast furnace.
2. after adding the air port lining, in the charging system adjustment, along with the quantity increase and decrease of air port lining brings air quantity to change, cloth angle and the number of turns do not adjust basically, and coal gas distributes in the stove does not have big variation yet, and air-flow is stablized relatively more easily.
3. after using the air port lining that contracts, the blast furnace day output presents downtrending, otherwise after disclosing mouthful lining that blows in; The blast furnace day output rises thereupon; Played the purpose of control combustion intensity, 4 air port lining output are adjusted scope in 60-80 ton iron/sky, have satisfied the effect of furnace processor fine setting.
4. 2 of installing/dismountings and during simultaneously with the uptake lining, the fluctuation of bosh coal gas amount can occur than great fluctuation process, and when adding two air port linings, bosh coal gas amount reduces 300m
3/ min, when adjusting 1 air port lining, general bosh coal gas quantitative change 20-70m
3/ min.
Beneficial effect:
It is flexible that 1 this method is adjusted the air port area, can adjust at any time as required, makes the air port area changeable according to adding cover quantity, and it is more flexible to carry out the area adjustment than the replacing air port;
2 installation and removal are simple and easy;
The control of 3 pairs of combustion intensity has realized flexible adjustment; How much add cover quantity according to the air port lining; Can effectively realize the output adjustment; When need improving combustion intensity, it is disclosed out as slag efflux, avoided unplanned damping down, prolong the repair time, stifled part air port, changed problems such as financial loss, smooth operation of furnace that other substituting measures such as small area air port bring be relatively poor;
4 use the air port lining that contracts after, the blast furnace day output presents downtrending, on the contrary after disclosing mouthful lining that blows in, the blast furnace day output rises thereupon, has played the purpose of control combustion intensity, has satisfied the effect of furnace processor fine setting.
5 mean lives were above 100 days.
Embodiment
According to the amplitude of blast furnace reduction combustion intensity, calculate the quantity that required air port adds cover; Confirm the installation site: select the air port that the air port is bright, working order is good to overlap the air port, press the circumferential direction symmetrical distribution and install for adding; Utilizing the blast furnace staying chance that the air port lining is installed in inlet front end gets final product; Under not damping down, checking situation, gradation is disclosed to open and is unloaded, with reference to wind speed, kinetic energy add-back air quantity progressively.
After the air port lining installs additional, require wind speed more than 260m/s, guaranteed that air quantity can blow blast furnace stock column and smooth operation of furnace.
The method of this control smelting strength of blast furnace has satisfied the effect of furnace processor fine setting to having realized the flexible adjustment of combustion intensity control.And the blast-furnace tuyere lining is durable, and mean life was above 100 days.
(1) combustion intensity reduces target: certain furnace volume useful volume 1280m3, and 18 air ports, because Market Situation is bad, not blowing-out limited production is adopted the air port to add the cover mode and is limited the production, the limited production amount is 80 tons/day;
(2) air port adds cover quantity: according to V
Wind=Q
Wind/ (F
1* 60) calculate, need 4 air ports add cover, could realize the target of limiting the production, dwindle the air port area and amount to 0.0216m2;
(3) add the cover tuyere position: the air port region in front is the zone of coke burning; Observe motion state and the bright degree of coke before the air port; Can judge that hot situation of cupola well and cupola well circumference evenly reach the smooth operation of furnace situation, select 4#, 10#, 16#, 22# air port to add cover based on the long-term even distribution of this blast-furnace tuyere;
(4) installation and use: utilize two hours damping down Fast Installation, air-supply back wind speed has guaranteed that air quantity can blow blast furnace stock column and smooth operation of furnace more than 260m/s.Use is contracted behind the lining of air port, and the air port area reduces to some extent, and blast furnace blast furnace full blast air quantity can slightly descend, and T reason, wind speed, blast energy rangeability are less, in ± 4%.
(5) result of use: after using the air port lining that contracts; The blast furnace day output presents downtrending; Otherwise after disclosing mouthful lining that blows in, the blast furnace day output rises thereupon, has played the purpose of control combustion intensity; 4 air port lining output are adjusted scope in 60-80 ton iron/sky, have satisfied the effect of furnace processor fine setting;
The method of this control smelting strength of blast furnace has satisfied the effect of furnace processor fine setting to having realized the flexible adjustment of combustion intensity control.And the blast-furnace tuyere lining is durable, and mean life was above 100 days.
Claims (1)
1. method with air port lining control smelting strength of blast furnace is characterized in that process step is:
(1) quantity of the required air port of calculating lining
Require to confirm air quantity Q according to output
Wind, air quantity Q
WindConfirm that the back keeps air port wind speed V
WindConstant, determine air port total area F according to the air quantity formula
1,
V
Wind=Q
Wind/ (F
1* 60)
V
Wind-standard state leeward one's intention as revealed in what one says speed, m/s;
F
1-air port the total area;
Q
Wind-air quantity, m3/min;
If the former air port total area is F
0, the tuyere small sleeve internal diameter is r, its area S=π r
2, the air port lining n=(F that accelerates
0-F
1)/S, n round number;
(2) confirm lining installation site, air port:
According to air port circumference working order, confirm that the air port that the air port is bright, working order is good is then lined air port, press the circumferential direction symmetrical distribution and install;
(3) air port lining installation and removal:
Because the air port lining only need utilize the damping down chance to be contained in inlet front end when installing, the recovery of just can blowing fast in 1 hour.Mean life was above 100 days; When needing to improve output; Do not accomplish under damping down, the checking situation at blast furnace; With reference to wind speed, kinetic energy progressively the add-back air quantity air port lining gradation disclosed out, avoided changing the working of a furnace fluctuation that brings for a long time in the air port, before and after it is changed blast furnace operating with do not have significant difference habitually in the past;
(4) air port adds the combustion intensity control behind the cover:
Use is contracted behind the lining of air port, and the air port area reduces, and blast furnace full blast air quantity reduces with equal proportion, 20-30 ℃ of reason combustion temperature decline, and wind speed is more than 260m/s, and blast furnace has guaranteed that air quantity can blow the blast furnace stock column, has guaranteed the direct motion of blast furnace;
After adding the air port lining, in the charging system adjustment, along with the quantity increase and decrease of air port lining brings air quantity to change, cloth angle and the number of turns do not adjust basically, and coal gas distributes in the stove does not have big variation yet, and air-flow is stablized relatively more easily;
After using the air port lining, 4 air port lining output are adjusted scope in 60-80 ton iron/sky.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104080783A CN102605123A (en) | 2011-12-09 | 2011-12-09 | Method for controlling smelting intensity of blast furnace by using air inlet linings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104080783A CN102605123A (en) | 2011-12-09 | 2011-12-09 | Method for controlling smelting intensity of blast furnace by using air inlet linings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102605123A true CN102605123A (en) | 2012-07-25 |
Family
ID=46522887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104080783A Pending CN102605123A (en) | 2011-12-09 | 2011-12-09 | Method for controlling smelting intensity of blast furnace by using air inlet linings |
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| CN (1) | CN102605123A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114381562A (en) * | 2021-12-29 | 2022-04-22 | 石横特钢集团有限公司 | Method for rapidly adjusting smelting intensity of blast furnace |
-
2011
- 2011-12-09 CN CN2011104080783A patent/CN102605123A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 丁汝才等: "首秦高炉风口加套控制冶炼强度的生产实践", 《2010年全国炼铁新技术应用及节能减排研讨会会议论文集》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114381562A (en) * | 2021-12-29 | 2022-04-22 | 石横特钢集团有限公司 | Method for rapidly adjusting smelting intensity of blast furnace |
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Application publication date: 20120725 |
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