CN108315515A - A method of reducing blast furnace level-lowering blowing out pinking - Google Patents
A method of reducing blast furnace level-lowering blowing out pinking Download PDFInfo
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- CN108315515A CN108315515A CN201810159783.6A CN201810159783A CN108315515A CN 108315515 A CN108315515 A CN 108315515A CN 201810159783 A CN201810159783 A CN 201810159783A CN 108315515 A CN108315515 A CN 108315515A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
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- C21B5/00—Making pig-iron in the blast furnace
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Abstract
The invention discloses a kind of method reducing blast furnace level-lowering blowing out pinking, technique is：The blast furnace is in level-lowering furnace shutting down process, the nitrogen that is passed through into stove by furnace roof watering pipe, top airtight box spout hole, furnace roof clack box, static pressure of furnace stack hole and two equal device of furnace roof batch can.This method is passed through a certain amount of nitrogen into stove by furnace roof watering pipe, top airtight box spout hole, furnace roof clack box, static pressure of furnace stack hole, two equivalent device of furnace roof batch can；The nitrogen being passed through not only can increase surface area, and can dilute H in mixed gas by atomization of water current at small water droplet2Equal explosion hazard gases ingredient, reduces risk for knock, to effectively realize safe and smooth blowing out.
Description
Technical field
The present invention relates to a kind of blast furnace level-lowering blowing out technology, especially a kind of side reducing blast furnace level-lowering blowing out pinking
Method.
Background technology
Blast furnace stopping is that blast furnace is big or middle repair before halt production operation, be blast furnace technology operation an important component, one
As require charge level to drop to furnace bosh or less air port region.During level-lowering, if the control of H2 contents is improper in stock gas,
It is readily formed explosive gas, gas explosion accident occurs.Blast furnace pinking easily causes the damage of furnace top equipment, furnace wall fire proofed wood
Material falls off, and possible open-top furnace roof diffuses, destroys furnace body cooling equipment when serious, causes the interruption of level-lowering process.Therefore, such as
Where blast furnace stopping is in the process by H in stock gas2Content controls in safe range, is important a research topic and reality
The important link of existing safe and smooth blowing out.
Invention content
The technical problem to be solved in the present invention is to provide a kind of methods reducing blast furnace level-lowering blowing out pinking, to ensure peace
All-cis profit blowing out.
In order to solve the above technical problems, the technical solution used in the present invention is：The blast furnace is in level-lowering furnace shutting down process
In, by furnace roof watering pipe, top airtight box spout hole, furnace roof clack box, static pressure of furnace stack hole and two equal device of furnace roof batch can to stove
The nitrogen being inside passed through.
In level-lowering furnace shutting down process of the present invention, the nitrogen flow being passed through after level-lowering to bosh in stove is blast furnace gas
The 8~12% of flow.
The method of the invention step is：（1）Before level-lowering starts, opens static pressure of furnace stack nitrogen purge pipe valve and be passed through
Nitrogen, flow is 2 times of nitrogen flow during normal production, until level-lowering is completed；
（2）After level-lowering starts, opens top airtight box and be passed through nitrogen, flow is the 2~2.5 of nitrogen flow during normal production
Times；
（3）After furnace roof is fetched water, opens furnace roof clack box and be passed through nitrogen, flow is 1.5~2 times of nitrogen flow during normal production；
（4）In the middle part of level-lowering to shaft, opens one batch can two of furnace roof and be passed through nitrogen, flow is nitrogen flow during normal production
4~5 times；
（5）After level-lowering to bosh, another batch can two of opening furnace roof is passed through nitrogen, and flow is nitrogen flow during normal production
4~5 times；
（6）During level-lowering, blast furnace gas H is controlled as possible2Content control is no more than 6vol%；Such as H2The frequent sustained wave of content
It moves more than 10vol%, cuts coal gas.
The basic principle of the present invention：
（a）Blast furnace water pumping is atomized into small water droplet by the nitrogen being passed through in stove.The surface area for the water that the mixing of nitrogen and water makes is significantly
Increase, can quickly absorb heat, reduces top temperature.By calculating, liquid water can be become 250 μm of diameter by nitrogen atomization after fetching water
Small water droplet, i.e., 1g water is dispersed as 122230 small water droplets, the surface area of 1g water is by 4.836cm2Increase to 240cm2, increase
To 50 times, heat can be quickly absorbed, reduces top temperature.
（b）According to coal gas composition changing rule during blast furnace process mechanism and blowing out level-lowering：Stockline is in furnace bosh
H in coal gas composition before2Content is in the safe range less than 6%, and stockline enters after bosh, H in coal gas composition2Content starts
It is apparent to rise, as charge level declines H in coal gas composition2Content continues to rise, and charge level reaches bosh middle and lower part and reaches highest, coal gas
Composition H2Content reaches as high as 12vol%, and risk for knock suddenly increases, it is necessary to stop recycling blast furnace gas.
（c）Increased nitrogen flow effect after in operations step of the present invention：Step（1）、（2）、（3）In, by
It is less in increased nitrogen flow, and this stage blast furnace gas quantity is larger, changing the effect of blast furnace gas composition wants small, main to make
With being to prevent pinking from being damaged to equipment；Step（4）、（5）In, charge level drops to shaft middle and lower part to the position of bosh, due to
The increased nitrogen flow of furnace roof batch can two is larger, adds step（1）、（2）、（3）In increased nitrogen flow, at this time
The nitrogen total flow being passed through in stove is very big, and this stage blast furnace gas quantity is being reduced, and can account for blast furnace gas at this
The 8~12% of flow can dilute H in mixed gas2Equal explosion hazard gases ingredient, effectively reduces H in coal gas2Content ensures coal gas
Middle H2Safer range within upper content limit 7.0vol% reduces risk for knock, extends the coal-gas recovering time, is conducive to
Environment protection emission demand.
It is using advantageous effect caused by above-mentioned technical proposal：The present invention passes through furnace roof watering pipe, top airtight box
Spout hole, furnace roof clack box, static pressure of furnace stack hole, two equivalent device of furnace roof batch can are passed through a certain amount of nitrogen into stove；The nitrogen being passed through
Gas not only can increase surface area, and can dilute H in mixed gas by atomization of water current at small water droplet2Equal explosion hazard gases at
Point, risk for knock is reduced, to effectively realize safe and smooth blowing out.
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 be the embodiment of the present invention 1 blast furnace level-lowering during major parameter variation diagram；
Fig. 2 be the embodiment of the present invention 1 blast furnace level-lowering during coal gas portioning analysis chart；
Fig. 3 be the embodiment of the present invention 2 blast furnace level-lowering during major parameter variation diagram；
Fig. 4 be the embodiment of the present invention 2 blast furnace level-lowering during coal gas portioning analysis chart.
Specific implementation mode
The method of this reduction blast furnace level-lowering blowing out pinking passes through furnace roof watering pipe, furnace roof in level-lowering furnace shutting down process
The nitrogen that pressure box spout hole, furnace roof clack box, static pressure of furnace stack hole and two equal device of furnace roof batch can are passed through into stove, thus by furnace roof
H in coal gas2Content controls in safe range.The nitrogen being preferably passed through after stockline enters furnace bosh, especially bosh section in stove
Flow will reach the 8~12% of blast furnace gas flow, by H in coal gas2Content drops to the safer model within 7.0vol%
It encloses.If H in coal gas2Content before stockline drops to furnace bosh, shaft middle and lower part just more than 6vol%, should just increase furnace roof batch can
Two equal nitrogen flows, reach the 8~12% of blast furnace gas flow, by coal gas H2Content drops to safer within 7.0vol%
Range.
The technology controlling and process of the method level-lowering furnace shutting down process of this reduction blast furnace level-lowering blowing out pinking is as described below：
（1）Before level-lowering starts, static pressure of furnace stack nitrogen purge pipe valve is opened, increases purging nitrogen amount, reaches normal discharge
2 times, until level-lowering complete.Static pressure of furnace stack hole nitrogen purge valve door starts front opening in level-lowering, prevents high-temperature coal air-flow
Block static pressure of furnace stack duct.The normal discharge is the nitrogen flow that blast furnace purges pipeline during normal production, it is because of blast furnace heat size
It is of different sizes and change.Such as 3200m3200~300m of blast furnace normal discharge range3/ h, range of flow 400 after increase~
600m3/h。
（2）After level-lowering starts, increases top airtight box nitrogen flow, reach 2~2.5 times of normal discharge.It is described just
Normal flow is the nitrogen flow of blast furnace top airtight box during normal production, it changes because blast furnace heat size is of different sizes.Such as
3200m31300~1500m of blast furnace normal discharge range3/ h, 2600~3750m of range of flow after increase3/h。
（3）After level-lowering starts, after furnace roof is fetched water, increases furnace roof clack box nitrogen flow, reach the 1.5~2 of normal discharge
Times.The normal discharge is the nitrogen flow of blast furnace furnace roof clack box during normal production, it changes because blast furnace heat size is of different sizes.
Such as 3200m3500~1000m of blast furnace normal discharge range3/ h, 750~2000m of range of flow after increase3/h。
（4）In the middle part of level-lowering to shaft, one batch can two of furnace roof is opened, valve opening 90~100% increases nitrogen stream
Amount, nitrogen flow reach 4~5 times of normal discharge, dilute the H in coal gas2, the explosive gas such as CO.The normal discharge is
The blast furnace equal nitrogen flow of the batch can two during normal production, it changes because blast furnace heat size is of different sizes；Dischargeable capacity is bigger, stove
Liftout tank volume is bigger, presses nitrogen flow bigger.Such as 2000m3The grade single batch can of blast furnace roof presses nitrogen flow normal
0~2500m of range3/ h, 0~12500m of range of flow after increase3/h。3200m3Grade furnace top material tank for blast furnace is pressing nitrogen flow just
0~3000m of normal range3/ h, 0~15000m of range of flow after increase3/h。
（5）After level-lowering to bosh, another batch can two of opening furnace roof is equal, and valve opening 90~100% increases nitrogen stream
Amount reaches 4~5 times of normal discharge, dilutes the H in coal gas2, the explosive gas such as CO.Level-lowering is to bosh area criterion.
It can be according to radar stock rod and gas composition comprehensive judgement, CO2There is apparent inflection point or H2＞ CO2When, illustrate to have been enter into furnace bosh region
（Universal law CO2An appearance of turning left enters furnace bosh, and an appearance of turning right enters bosh, and what left and right inflection point relatively entered is stove
In the middle part of waist, air quantity is smaller, and a stockline occurred of turning right is deeper）.The normal discharge is that the batch can two is equal during normal production for blast furnace
Nitrogen flow, it changes because blast furnace heat size is of different sizes.Such as 2000m3The grade single batch can of blast furnace roof presses nitrogen stream
Measure 0~2500m of normal range (NR)3/ h, 0~12500m of range of flow after increase3/h。3200m3Grade furnace top material tank for blast furnace presses nitrogen
0~3000m of flow normal range (NR)3/ h, 0~15000m of range of flow after increase3/h。
（6）During level-lowering, blast furnace gas H2Content control is no more than normal value 6vol%, otherwise should take reduction wind
The effective measures such as temperature, air quantity, the amount of fetching water reduce H2Content；When pinking is frequent, takes above-mentioned adjustment means that can not reduce H2Content,
H2The frequent continued jitters of content are more than dangerous values 10vol%, i.e. H2Content is more than when the time of 10vol% being continued above 3 minutes, must
It must carry out cutting coal gas.The meaning for cutting coal gas is off recycling blast furnace gas, and blast furnace gas diffuses sky.
（7）When charge level has been reduced to bosh area, blast furnace stops gas recovery.It is more late to cut the coal gas time, the gas recovery time
It is longer, it causes damages to environmental protection smaller, under the premise that security is guaranteed, the coal-gas recovering time should be extended as possible.
Embodiment 1：With Handan Iron and Steel Co 3200m3For blast furnace level-lowering blowing out on the 27th in 2 months in 2017, this reduction blast furnace level-lowering
The concrete technology of the method for blowing out pinking is as follows.
（1）Before level-lowering starts, three sections of static pressure nitrogen purge pipes of shaft are investigated, carry out nitrogen valve, nitrogen purge gas flow
Measure the 250m by normal discharge3/ h increases to 500m3/h。
（2）After level-lowering starts, increase top airtight box nitrogen flow, by 1500m3/ h is increased to 3000m3/h。
（3）Furnace roof is fetched water after beginning, furnace roof clack box nitrogen flow by normal discharge 600m3/ h increases to 1200m3/h。
（4）In the middle part of level-lowering to shaft, a batch can two is opened, valve opening 90%, nitrogen flow is by normal discharge
3000m3/ h increases to 12000m3/h。
（5）After level-lowering to bosh, another batch can two is opened, valve opening 100%, nitrogen flow is by normal discharge
3000m3/ h increases to 15000m3/h；Two two equal nitrogen flows amount to 27000m3/h。
After charge level drops to bosh, the whole nitrogen flows being filled at this time in stove can reach 31700m3/ h accounts for blast furnace at this
10% or so of coal gas total amount effectively reduces H in coal gas2Content is always ensured that H in coal gas2Within upper content limit 7.0vol% compared with
For the range of safety.
（6）Cut coal gas operation：Open furnace roof diameter 1000mm diffusion valves, hemisection coal gas；Close two equal nitrogen of furnace roof batch can
Valve；Two diameter 750mm diffusion valves of furnace roof are opened, gravitational precipitator stop valve is closed, cuts coal gas entirely.
During major parameter variation diagram, Fig. 2 are the present embodiment blast furnace level-lowering during Fig. 1 is the present embodiment blast furnace level-lowering
Coal gas portioning analysis chart.Primary big pinking does not occur for the overall process of this level-lowering, and only charge level has in bosh and pushes up three times
Pressure rises the slight small shake less than 9kpa.This level-lowering time started 8:00, furnace roof diffuses opening time 19:10, recycle coal
Gas time 11h10min.By combining mechanical stock rod, radar stock rod and coal gas on-line analysis curve, reach bosh under final charge level
Coal gas is just cut at middle part, and the stockline position positions about 23.6m substantially prolong the coal-gas recovering time.Compared with previous level-lowering, coal
Gas recovery time extends about 3 hours, and charge level reduces depth and increases by 1.6 meters, has reached safe and environment-friendly blowing out requirement.
Embodiment 2：With Handan Iron and Steel Co 2000m3For blast furnace level-lowering blowing out on November 6 in 2017, this reduction blast furnace level-lowering
The concrete technology of the method for blowing out pinking is as follows.
（1）Before level-lowering starts, three sections of static pressure nitrogen purge pipes of shaft are investigated, carry out nitrogen valve, nitrogen purge gas flow
Measure the 200m by normal discharge3/ h increases to 400m3/h。
（2）After level-lowering starts, increase top airtight box nitrogen flow, by 1300m3/ h is gradually increased to 3250m3/h。
（3）Furnace roof is fetched water after beginning, furnace roof clack box nitrogen flow by normal discharge 500m3/ h increases to 900m3/h。
（4）In the middle part of level-lowering to shaft, a batch can two is opened, valve opening 100%, nitrogen flow is by normal discharge
2000m3/ h increases to 10000m3/h。
（5）After level-lowering to bosh, another batch can two is opened, valve opening 90%, nitrogen flow is by normal discharge
2000m3/ h increases to 8000m3/h；Two two equal nitrogen flows amount to 18000m3/h。
After charge level drops to bosh, the whole nitrogen flows being filled at this time in stove can reach 22550m3/ h accounts for blast furnace at this
The 12% of coal gas total amount effectively reduces H in coal gas2Content is always ensured that H in coal gas2More peace within upper content limit 7.0vol%
Full range.
（6）Cut coal gas operation：Open furnace roof diameter 1000mm diffusion valves, hemisection coal gas；Close two equal nitrogen of furnace roof batch can
Valve；Two diameter 750mm diffusion valves of furnace roof are opened, gravitational precipitator stop valve is closed, cuts coal gas entirely.
During major parameter variation diagram, Fig. 4 are the present embodiment blast furnace level-lowering during Fig. 3 is the present embodiment blast furnace level-lowering
Coal gas portioning analysis chart.Primary big pinking does not occur for this level-lowering overall process, top pressure 80kpa a to 86kpa only occurs
Light knock；Remaining time, top pressure fluctuating range are respectively less than 5kpa.This level-lowering time started 9:30, furnace roof, which diffuses, to be beaten
ETAD expected time of arrival and departure 23:10, gas recovery time 13h40min.Compared with previous level-lowering, coal-gas recovering time lengthening about 3 hours, material
Face reduces depth and increases by 1.6 meters, has reached safe and environment-friendly blowing out requirement.
Embodiment 3：With Handan Iron and Steel Co 3200m3For blast furnace level-lowering blowing out, the method for this reduction blast furnace level-lowering blowing out pinking
Concrete technology it is as follows.
（1）Before level-lowering starts, three sections of static pressure nitrogen purge pipes of shaft are investigated, carry out nitrogen valve, nitrogen purge gas flow
Measure the 200m by normal discharge3/ h increases to 400m3/h。
（2）After level-lowering starts, increase top airtight box nitrogen flow, by 1400m3/ h is increased to 3080m3/h。
（3）Furnace roof is fetched water after beginning, furnace roof clack box nitrogen flow by normal discharge 800m3/ h increases to 1200m3/h。
（4）In the middle part of level-lowering to shaft, a batch can two is opened, valve opening 95%, nitrogen flow is by normal discharge
2000m3/ h increases to 9000m3/h。
（5）After level-lowering to bosh, another batch can two is opened, valve opening 92%, nitrogen flow is by normal discharge
2000m3/ h increases to 9600m3/h；Two two equal nitrogen flows amount to 18600m3/h。
After charge level drops to bosh, the whole nitrogen flows being filled at this time in stove can reach 23280m3/ h accounts for blast furnace at this
The 8% of coal gas total amount effectively reduces H in coal gas2Content.Most of the time ensures H in coal gas2Within upper content limit 7.0vol%
Safer range.
（6）There is H twice during level-lowering2The frequent continued jitters of content are more than dangerous values 10vol%.It is more than every time
It just carries out cutting coal gas operation when dangerous values, waits for blast furnace gas H2Content continues to support operation after being less than 6vol%.
（7）Cut coal gas operation：Open furnace roof diameter 1000mm diffusion valves, hemisection coal gas；Close two equal nitrogen of furnace roof batch can
Valve；Two diameter 750mm diffusion valves of furnace roof are opened, gravitational precipitator stop valve is closed, cuts coal gas entirely.
Primary big pinking does not occur for this level-lowering overall process, the slight quick-fried of top pressure 80kpa to 86kpa twice only occurs
Shake；Remaining time, top pressure fluctuating range are respectively less than 5kpa.This level-lowering time started 9:30, furnace roof diffuses opening time 23:
10, gas recovery time 13h40min.Compared with previous level-lowering, coal-gas recovering time lengthening about 3.1 hours, charge level reduces deep
Degree increases by 1.4 meters, has reached safe and environment-friendly blowing out requirement.
Claims (3)
1. a kind of method reducing blast furnace level-lowering blowing out pinking, it is characterised in that：The blast furnace in level-lowering furnace shutting down process,
Led into stove by furnace roof watering pipe, top airtight box spout hole, furnace roof clack box, static pressure of furnace stack hole and two equal device of furnace roof batch can
The nitrogen entered.
2. the method according to claim 1 for reducing blast furnace level-lowering blowing out pinking, it is characterised in that：The level-lowering stops
The nitrogen flow being passed through during stove, after level-lowering to bosh in stove is the 8~12% of blast furnace gas flow.
3. the method according to claim 1 or 2 for reducing blast furnace level-lowering blowing out pinking, which is characterized in that the method
Step is：（1）Before level-lowering starts, opens static pressure of furnace stack nitrogen purge pipe valve and be passed through nitrogen, flow is during normal production
2 times of nitrogen flow, until level-lowering is completed；
（2）After level-lowering starts, opens top airtight box and be passed through nitrogen, flow is the 2~2.5 of nitrogen flow during normal production
Times；
（3）After furnace roof is fetched water, opens furnace roof clack box and be passed through nitrogen, flow is 1.5~2 times of nitrogen flow during normal production；
（4）In the middle part of level-lowering to shaft, opens one batch can two of furnace roof and be passed through nitrogen, flow is nitrogen flow during normal production
4~5 times；
（5）After level-lowering to bosh, another batch can two of opening furnace roof is passed through nitrogen, and flow is nitrogen flow during normal production
4~5 times；
（6）During level-lowering, blast furnace gas H is controlled as possible2Content control is no more than 6vol%；Such as H2The frequent continued jitters of content
More than 10vol%, coal gas is cut.
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| CN201810159783.6A CN108315515B (en) | 2018-02-26 | 2018-02-26 | Method for reducing blast furnace blowing-out detonation at material level lowering of blast furnace |
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| CN201810159783.6A CN108315515B (en) | 2018-02-26 | 2018-02-26 | Method for reducing blast furnace blowing-out detonation at material level lowering of blast furnace |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109295271A (en) * | 2018-11-27 | 2019-02-01 | 南京钢铁股份有限公司 | A kind of method that blast furnace stockline dropping blowing out extends the gas recovery time |
| CN110117683A (en) * | 2019-04-29 | 2019-08-13 | 柳州钢铁股份有限公司 | Stockline dropping is to air port novel environment friendly blowing out operating method |
| CN112899421A (en) * | 2021-01-18 | 2021-06-04 | 广东韶钢松山股份有限公司 | Method for quickly lowering charge level of blast furnace during shutdown |
| CN112961950A (en) * | 2021-02-01 | 2021-06-15 | 广东韶钢松山股份有限公司 | Furnace cooling method for blast furnace |
| CN113470768A (en) * | 2021-06-15 | 2021-10-01 | 山西太钢不锈钢股份有限公司 | Method for measuring and calculating filling line in blast furnace blowing-in material combined calculation |
| CN114959137A (en) * | 2022-06-15 | 2022-08-30 | 新余钢铁股份有限公司 | Construction method for maintenance operation safety environment in blast furnace |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109295271A (en) * | 2018-11-27 | 2019-02-01 | 南京钢铁股份有限公司 | A kind of method that blast furnace stockline dropping blowing out extends the gas recovery time |
| CN109295271B (en) * | 2018-11-27 | 2020-07-14 | 南京钢铁股份有限公司 | Method for prolonging time for recovering coal gas by blowing out blast furnace empty material line |
| CN110117683A (en) * | 2019-04-29 | 2019-08-13 | 柳州钢铁股份有限公司 | Stockline dropping is to air port novel environment friendly blowing out operating method |
| CN112899421A (en) * | 2021-01-18 | 2021-06-04 | 广东韶钢松山股份有限公司 | Method for quickly lowering charge level of blast furnace during shutdown |
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| CN112961950A (en) * | 2021-02-01 | 2021-06-15 | 广东韶钢松山股份有限公司 | Furnace cooling method for blast furnace |
| CN112961950B (en) * | 2021-02-01 | 2022-03-11 | 广东韶钢松山股份有限公司 | Furnace cooling method for blast furnace |
| CN113470768A (en) * | 2021-06-15 | 2021-10-01 | 山西太钢不锈钢股份有限公司 | Method for measuring and calculating filling line in blast furnace blowing-in material combined calculation |
| CN114959137A (en) * | 2022-06-15 | 2022-08-30 | 新余钢铁股份有限公司 | Construction method for maintenance operation safety environment in blast furnace |
| CN114959137B (en) * | 2022-06-15 | 2023-09-26 | 新余钢铁股份有限公司 | Construction method for safety environment of overhauling operation in blast furnace |
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|---|---|
| CN108315515B (en) | 2020-03-06 |
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