CN108060281B - A kind of method of blast furnace drop furnace temperature - Google Patents
A kind of method of blast furnace drop furnace temperature Download PDFInfo
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- CN108060281B CN108060281B CN201711258262.8A CN201711258262A CN108060281B CN 108060281 B CN108060281 B CN 108060281B CN 201711258262 A CN201711258262 A CN 201711258262A CN 108060281 B CN108060281 B CN 108060281B
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- furnace temperature
- fuel ratio
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The present invention relates to a kind of method of blast furnace drop furnace temperature, it include the steps that it is following successively: I reduces furnace temperature when furnace temperature is greater than or equal to 0.70%, according to every four hours reductions by 4 ~ 6kg of fuel ratio drop furnace temperature；II control furnace temperature takes first four hours 4 ~ 6kg of reductions when range of the furnace temperature 0.55% ~ 0.69%, slightly adjusts back within latter four hours the method reduction furnace temperature of 2 ~ 3kg；III determines that fuel ratio when 0.45% ± 0.05% liang of heat occurs in furnace temperature, then takes preceding 8 hourly average fuel ratio as the fuel ratio controlled when smelting.The method of blast furnace drop furnace temperature of the invention, reduces iron-smelting fuel consumption, reduces ironmaking cost.
Description
Technical field
The present invention relates to a kind of methods of blast furnace drop furnace temperature.
Background technique
Furnace temperature refers to the mass percent of silicon content of hot metal in blast furnace ironmaking.The height of silicon content of hot metal is disappeared with blast furnace again
Fuel ratio (smelting the dry amount of coke of one ton of iron consumption and kilogram number of the sum of coal dust amount) correlation of consumption, so, drop
Furnace temperature can reduce fuel consumption again.For blast furnace operating person, drop furnace temperature operation is a kind of operation common in blast furnace operating.
But the method due to reducing furnace temperature is not scientific, it will usually two kinds of situations occurs, first is that too conservative when drop furnace temperature, furnace temperature
Prescribed limit is not achieved for a long time；It too advancing rashly when second is that reducing furnace temperature, furnace temperature is brought down below normal control threshold level in short-term,
Then there is the process for proposing furnace temperature again, control furnace temperature is too low when furnace temperature drops in appearance that What is more, slide rule, hanging, cupola well occurs and freezes
Phenomena such as knot, brings serious harm to blast fumance, and improves iron-smelting fuel consumption, increases ironmaking cost.
Summary of the invention
In order to overcome existing blast furnace drop furnace temperature method above-mentioned deficiency, the present invention provides a kind of stable blast furnace drop furnace temperature
Method, and reduce iron-smelting fuel consumption, reduce ironmaking cost.
Idea of the invention is that being influenced for furnace temperature during blast furnace ironmaking by many factors.Fuel ratio is wherein weight
Maximum factor, so during reducing furnace temperature, often to reduce fuel ratio as main regulating measure.But shadow
The factor for ringing furnace temperature is not only fuel ratio, and other numerous factors, which are combined, can make blast furnace operating become complicated, if simple
Singlely remove adjustment fuel ratio according to the corresponding relationship of fuel ratio and silicon content of hot metal, then other factors will show it is no small
Effect, so that simply going operating blast furnaces out-of-control phenomenon occur according to fuel ratio, i.e., actual furnace temperature will be lower than according to fuel ratio pair
The furnace temperature answered, here it is the thermal inertia problem described in blast furnace operating, but these factors, and can not go to measure with exact amount,
So this method is exactly in trade-off fuel than indulging a kind of multifactor rear stabilization proposed, the quick side for reducing furnace temperature with other
Method.The present invention propose: when furnace temperature distance objective control range farther out when, can be simply corresponding according to furnace temperature and the relationship of fuel ratio
The control for carrying out fuel ratio, to take when close to target control range reduces fuel ratio and the slightly way of readjustment fuel ratio,
Stablize, is quick, the accurate oven temperature ranges for reaching actual requirement.Drop fuel ratio in the latter be be reach target furnace temperature progress
Movement, slightly adjust back fuel ratio in order that overcoming the operation for thermal inertia occur during dropping furnace temperature and carrying out.When continuous
When the furnace temperature of target control furnace temperature middle line ± 0.05% occur in two heats, then it is believed that furnace temperature reaches control range.But fuel
Than it is selected than take preceding 8 small hourly values because current furnace temperature be not only the effect of nearest 4 hours fuel ratios as a result, also with
The effect of preceding 4 ~ 8 hours fuel ratios is related.
The control range (generally 0.35% ~ 0.55%) of this blast furnace low silicon smelting furnace temperature and be designed.
This blast furnace drop furnace temperature method include the steps that it is following successively:
It include the steps that it is following successively:
I reduces furnace temperature
When furnace temperature is greater than or equal to 0.70%, furnace temperature drops according to every four hours reduction by 4 ~ 6kg of fuel ratio；When furnace temperature is greater than
When equal to 0.70% or more, when the measure taken when dropping furnace temperature is according to every four hours reduction fuel ratio 5kg(blast furnace ironmakings, at it
When its condition is constant, fuel ratio and the corresponding relationship of furnace temperature are the fuel ratio of the every 0.1% corresponding 5kg of silicon content of hot metal, and fire
Material than be influence silicon content of hot metal principal element, but and not all factor) rhythm drop furnace temperature.
II control furnace temperature
When range of the furnace temperature 0.55% ~ 0.69%, take first four hours reduction by 4 ~ 6kg, latter four hours slightly readjustment 2 ~
The method of 3kg reduces furnace temperature.
III determines fuel ratio
When 0.45% ± 0.05% liang of heat occurs in furnace temperature, then controlled when taking preceding 8 hourly average fuel ratio as smelting
Fuel ratio.
Beneficial effects of the present invention
1. it is too slow to put fuel ratio during solving the problems, such as drop furnace temperature.The present invention gives can continuously reduce fuel ratio
Oven temperature ranges.
2. it is too fast to put fuel ratio during solving the problems, such as drop furnace temperature.The present invention gives fuel ratios during drop furnace temperature
There are the oven temperature ranges and concrete operation method of readjustment in drop.
3. avoid put furnace temperature it is too slow or too fast and caused by long-term furnace temperature it is too high or caused since furnace temperature is too low
Slide rule, hanging notably gobbed up phenomenon, so as to cause the raising of ironmaking cost.
Specific embodiment
A specific embodiment of the invention is further illustrated below with reference to embodiment.For the explanation of the following examples
Help to understand the present invention, but is not limitation of the present invention.
Embodiment
This blast furnace drop furnace temperature method include the steps that it is following successively:
I reduces furnace temperature
Four hours fuel ratios are 511kg after night shift one day, and four hours furnace temperature are higher before day shift, in 0.90%~0.97% model
It encloses, which is more than or equal to 0.7%；Therefore 4 hours fuel ratios are controlled according to 6kg is reduced before day shift, in 505kg fuel ratio
Under the action of smelt, four hours furnace temperature progress into 0.84% ~ 0.88% after class, are still greater than 0.7%；Then it fires within four hours after day shift
Material is controlled according to 500kg than continuing to reduce 5kg, two classes early period furnace temperature progress into 0.65% ~ 0.69%, furnace temperature is lower than 0.7%；
II control furnace temperature
Therefore four hours fuel ratios reduce 5kg again before two classes, control according to 495kg, four hours furnace temperature progress into after two classes
0.56% ~ 0.59% range, four hours fuel ratios do not continue to reduce after two classes, but adjust back 2kg, control according to 497kg；Second
Four hours furnace temperature progress into 0.45% ~ 0.50% before day night shift, and fuel ratio is according to reducing 4kg(493kg) control, and furnace temperature into
Enter 0.45% ± 0.05% liang of heat.
III determines fuel ratio
Therefore four hours after night shift are controlled according to preceding 8 small hourly values (495kg), subsequent furnace temperature reaches normal control middle line
Level maintains the control range for arriving blast furnace low silicon smelting furnace temperature, is 0.35% ~ 0.55%.
Claims (1)
1. a kind of method of blast furnace drop furnace temperature, it include the steps that it is following successively:
I reduces furnace temperature
When furnace temperature is greater than or equal to 0.70%, furnace temperature drops according to every four hours reduction by 4 ~ 6kg of fuel ratio；
II control furnace temperature
When range of the furnace temperature 0.55% ~ 0.69%, take first four hours reduction by 4 ~ 6kg, latter four hours small size 2 ~ 3kg of readjustment
Method reduces furnace temperature；
III determines fuel ratio
When 0.45% ± 0.05% liang of heat occurs in furnace temperature, then take preceding 8 hourly average fuel ratio as the fuel controlled when smelting
Than.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711258262.8A CN108060281B (en) | 2017-12-04 | 2017-12-04 | A kind of method of blast furnace drop furnace temperature |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711258262.8A CN108060281B (en) | 2017-12-04 | 2017-12-04 | A kind of method of blast furnace drop furnace temperature |
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| CN108060281A CN108060281A (en) | 2018-05-22 |
| CN108060281B true CN108060281B (en) | 2019-08-23 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112906196B (en) * | 2021-01-21 | 2023-03-14 | 山西太钢不锈钢股份有限公司 | Method for determining reasonable range of fuel ratio of blast furnace |
| CN115185250A (en) * | 2022-09-09 | 2022-10-14 | 北京智冶互联科技有限公司 | Method for controlling fuel ratio in production process of ferrous metallurgy blast furnace |
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| CN101581939B (en) * | 2009-05-31 | 2010-12-29 | 济钢集团有限公司 | Method and system for monitoring fuel ratio of blast furnace in real time |
| CN102899431A (en) * | 2012-10-23 | 2013-01-30 | 秦皇岛首秦金属材料有限公司 | Method for quantitatively recovering abnormal furnace condition of blast furnace |
| CN105886680B (en) * | 2016-05-11 | 2017-12-29 | 东北大学 | A kind of blast furnace ironmaking process molten iron silicon content dynamic soft measuring system and method |
| CN107119156B (en) * | 2017-04-22 | 2021-05-04 | 新兴铸管股份有限公司 | Method for increasing temperature of blast furnace top gas |
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