CN112662825A - Material distribution method for adjusting air flow distribution of blast furnace center - Google Patents
Material distribution method for adjusting air flow distribution of blast furnace center Download PDFInfo
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- CN112662825A CN112662825A CN202011515809.XA CN202011515809A CN112662825A CN 112662825 A CN112662825 A CN 112662825A CN 202011515809 A CN202011515809 A CN 202011515809A CN 112662825 A CN112662825 A CN 112662825A
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Abstract
The invention relates to a material distribution method for adjusting the air flow distribution of the center of a blast furnace, which comprises the following steps of: the angle of the coke attached to the center is expanded outwards by using the distribution chute, and the angle of the center coke is changed from the previous angle at which the coke can vertically fall; the coke proportion is controlled to be about 10-15% of the total amount of the coke at an angle of 18-20 degrees; preferably controlled at 350 ℃ and 450 ℃; when the central temperature is lower than 350 ℃, the total coke amount is controlled at the total upper limit of 15 percent at an angle of 18-20 ℃; when the central temperature is still lower than 350 ℃, the coke amount at 18-20 ℃ is unchanged, and extra coke is added at an angle of 11 degrees, wherein the central coke does not touch the chute; when the central temperature is higher than 450 ℃; when the core temperature is continuously higher than 550 ℃, the total amount of coke at 18 to 20 ℃ is used at the lower limit of 10% of the total amount of coke. The invention can realize higher coal gas utilization rate and realize the aims of low consumption and long-period stable smooth running of the blast furnace.
Description
Technical Field
The invention belongs to the field of blast furnace steelmaking, and particularly relates to a material distribution method for adjusting the central airflow distribution of a blast furnace.
Background
The key point of the daily operation and the dispensing process of blast furnace iron making is to maintain the balanced and stable of two gas flows at the center and the edge. In particular, the maintenance of the stability of the central gas flow is the basis for maintaining the long-term stable and smooth running of the blast furnace. In the current blast furnace operation process, the upper distribution matrix is divided into two distribution modes for ensuring smooth central gas flow, wherein one mode is a central coke feeding mode, namely the angle of coke falling from a central throat pipe without touching a distribution chute is generally less than or equal to 12 degrees. The other one adopts a material distribution mode of a platform and a funnel, the ores and the cokes are completely paved, and a stable funnel-shaped operation material surface is formed at the central part of the blast furnace.
The blast furnace adopting the central coke feeding and distributing mode has the advantages that the smooth flow of central gas can be kept by extracting part of coke in the coke batch and completely placing the extracted coke in the central part, the blast furnace has strong resistance to the change of external raw fuel conditions, and the long-term stable and smooth operation of the furnace condition can be kept. The disadvantage is that the blast furnace gas utilization rate is low, which leads to the fuel ratio being generally high.
The platform and funnel distribution mode has the advantages that the coal gas utilization rate of the blast furnace is high, the fuel ratio of the blast furnace is low, the blast furnace is suitable for low-cost smelting, and the defects that the requirement on external raw fuel conditions is high, furnace condition fluctuation is caused when the external conditions are changed, the yield and the cost are lost, and the stability of the blast furnace is not as good as that of a blast furnace with central coking.
Disclosure of Invention
The invention aims to provide a material distribution method for adjusting the distribution of central air flow of a blast furnace, which can realize higher coal gas utilization rate, can keep the long-term stable smooth operation of furnace conditions when the external conditions change, and realizes the aims of low consumption and long-period stable smooth operation of the blast furnace.
The technical scheme adopted by the invention for solving the technical problems is as follows: a material distribution method for adjusting air flow distribution of the center of a blast furnace comprises the following steps:
1) the angle of the coke attached to the center is expanded outwards by using the distribution chute, and the angle of the center coke is changed from the previous angle at which the coke can vertically fall; outwardly expanding to 18-20 °; so as to improve the utilization rate of the coal gas and reduce the fuel ratio of the blast furnace;
2) the coke proportion is controlled to be about 10-15% of the total amount of the coke at an angle of 18-20 degrees;
3) the control principle of the central coke quantity is that the central temperature is judged by the cross temperature measurement and is preferably controlled at 350-450 ℃;
4) when the central temperature is lower than 350 ℃, the total coke amount is controlled at the total upper limit of 15 percent at an angle of 18-20 ℃;
5) when the central temperature is still lower than 350 ℃, the coke amount at 18-20 ℃ is unchanged, and extra coke is added at the angle of 11 degrees, at which the central coke does not touch the chute, in such a way that 2-4t of coke is added in each 5 batches of charging materials, the ending angle of the coke is set at 11 degrees, so that the extra coke can be arranged at 11 degrees, and the way of guiding the central air flow is started;
6) when the center temperature is higher than 450 ℃, the extra coke at the center 11 ℃ is not used;
7) when the core temperature is continuously higher than 550 ℃, the total amount of coke at 18 to 20 ℃ is used at the lower limit of 10% of the total amount of coke.
The invention has the following beneficial effects: the invention discloses a material distribution method for adjusting the central airflow distribution of a blast furnace, which is characterized in that a new balance point is searched between a traditional platform plus a funnel and a central coking mode, and the utilization rate of blast furnace gas is improved and the fuel ratio of the blast furnace is reduced by reducing the proportion of central coke and controlling the angle of the central coke to be 18-20 degrees. Secondly, the smoothness of the central air flow is ensured through the extra central coke amount, and the long-term stable and smooth running target of the blast furnace is achieved. The method of the invention mainly solves the problem of the relationship of high yield, low consumption and long-term stable operation of the blast furnace.
Drawings
FIG. 1 is a flow chart of an embodiment of the distribution method for adjusting the air flow distribution in the center of a blast furnace according to the present invention.
Detailed Description
A material distribution method for adjusting air flow distribution of the center of a blast furnace comprises the following steps:
1) the angle of the coke added at the center is expanded by using the distribution chute, and the angle of the central coke is the angle at which the previous coke can vertically fall (for example, the angle at which the coke vertically falls and does not touch the distribution chute is less than or equal to 11 degrees in a certain 5100 blast furnace in China); outwardly expanding to 18-20 °; so as to improve the utilization rate of the coal gas and reduce the fuel ratio of the blast furnace;
2) the coke proportion is controlled to be about 10-15% of the total amount of the coke at an angle of 18-20 degrees;
3) the control principle of the central coke quantity is that the central temperature is judged by the cross temperature measurement and is preferably controlled at 350-450 ℃;
4) when the central temperature is lower than 350 ℃, the total coke amount is controlled at the total upper limit of 15 percent at an angle of 18-20 ℃;
5) when the central temperature is still lower than 350 ℃, the coke amount at 18-20 ℃ is unchanged, and extra coke is added at the angle of 11 degrees, at which the central coke does not touch the chute, in such a way that 2-4t of coke is added in each 5 batches of charging materials, the ending angle of the coke is set at 11 degrees, so that the extra coke can be arranged at 11 degrees, and the way of guiding the central air flow is started;
6) when the center temperature is higher than 450 ℃, the extra coke at the center 11 ℃ is not used;
7) when the core temperature is continuously higher than 550 ℃, the total amount of coke at 18 to 20 ℃ is used at the lower limit of 10% of the total amount of coke.
Claims (1)
1. A material distribution method for adjusting air flow distribution in the center of a blast furnace is characterized by comprising the following steps of:
1) the angle of the coke attached to the center is expanded outwards by using the distribution chute, and the angle of the center coke is changed from the previous angle at which the coke can vertically fall; outwardly expanding to 18-20 °; so as to improve the utilization rate of the coal gas and reduce the fuel ratio of the blast furnace;
2) the coke proportion is controlled to be about 10-15% of the total amount of the coke at an angle of 18-20 degrees;
3) the control principle of the central coke quantity is that the central temperature is judged by the cross temperature measurement and is preferably controlled at 350-450 ℃;
4) when the central temperature is lower than 350 ℃, the total coke amount is controlled at the total upper limit of 15 percent at an angle of 18-20 ℃;
5) when the central temperature is still lower than 350 ℃, the coke amount at 18-20 ℃ is unchanged, and extra coke is added at the angle of 11 degrees, at which the central coke does not touch the chute, in such a way that 2-4t of coke is added in each 5 batches of charging materials, the ending angle of the coke is set at 11 degrees, so that the extra coke can be arranged at 11 degrees, and the way of guiding the central air flow is started;
6) when the center temperature is higher than 450 ℃, the extra coke at the center 11 ℃ is not used;
7) when the core temperature is continuously higher than 550 ℃, the total amount of coke at 18 to 20 ℃ is used at the lower limit of 10% of the total amount of coke.
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| CN202011515809.XA CN112662825A (en) | 2020-12-21 | 2020-12-21 | Material distribution method for adjusting air flow distribution of blast furnace center |
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| CN202011515809.XA CN112662825A (en) | 2020-12-21 | 2020-12-21 | Material distribution method for adjusting air flow distribution of blast furnace center |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875188A (en) * | 2022-05-27 | 2022-08-09 | 本溪北营钢铁（集团）股份有限公司 | Material distribution method for quickly adjusting blast furnace edge airflow |
Citations (3)
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| JP2010150643A (en) * | 2008-12-26 | 2010-07-08 | Jfe Steel Corp | Method for charging raw material to blast furnace |
| CN108642219A (en) * | 2018-04-24 | 2018-10-12 | 武汉钢铁有限公司 | A method of improving blast furnace top gas temperature |
| CN111139325A (en) * | 2020-01-21 | 2020-05-12 | 鞍钢股份有限公司 | Non-bell material distribution center coking compensation method |
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2020
- 2020-12-21 CN CN202011515809.XA patent/CN112662825A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010150643A (en) * | 2008-12-26 | 2010-07-08 | Jfe Steel Corp | Method for charging raw material to blast furnace |
| CN108642219A (en) * | 2018-04-24 | 2018-10-12 | 武汉钢铁有限公司 | A method of improving blast furnace top gas temperature |
| CN111139325A (en) * | 2020-01-21 | 2020-05-12 | 鞍钢股份有限公司 | Non-bell material distribution center coking compensation method |
Non-Patent Citations (2)
| Title |
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| 徐俊杰等: "邯钢7号高炉布料制度探索", 《2018年高炉限产季、错峰季生产组织经验分析研讨会论文集》 * |
| 杨雷: "莱钢1#1880m3高炉煤气流分布失常的处理及恢复", 《山东冶金》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875188A (en) * | 2022-05-27 | 2022-08-09 | 本溪北营钢铁（集团）股份有限公司 | Material distribution method for quickly adjusting blast furnace edge airflow |
| CN114875188B (en) * | 2022-05-27 | 2024-04-12 | 本溪北营钢铁（集团）股份有限公司 | Material distribution method for rapidly adjusting blast furnace edge air flow |
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Application publication date: 20210416 |