CN114350862A - Method for prolonging service life of blast furnace hearth - Google Patents
Method for prolonging service life of blast furnace hearth Download PDFInfo
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- CN114350862A CN114350862A CN202111414023.3A CN202111414023A CN114350862A CN 114350862 A CN114350862 A CN 114350862A CN 202111414023 A CN202111414023 A CN 202111414023A CN 114350862 A CN114350862 A CN 114350862A
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Abstract
The invention relates to a method for prolonging the service life of a blast furnace hearth, belonging to the technical field of blast furnace ironmaking. The technical scheme of the invention is as follows: when the temperature of the side wall of the hearth is in an ascending trend, if the central coke proportion is lower, the central coke proportion is properly improved; if the coke quality is poor, the dead stock column coke can be directly updated by improving the coke quality; if only part of coke has good quality, the high-quality coke is distributed in the center of the blast furnace and the poor coke is distributed at the edge and the middle position by adjusting the distribution sequence. The method can effectively improve the activity of the hearth, reduce the molten iron circulation, relieve the elephant foot erosion of the hearth, prolong the service life of the hearth, and has the characteristics of strong operability, simple process and easy realization.
Description
Technical Field
The invention relates to a method for prolonging the service life of a blast furnace hearth, belonging to the technical field of blast furnace ironmaking.
Background
The long service life of the blast furnace is a system project, has more influence factors, and each factor influences the long service life of the blast furnace from the design, material selection, construction, operation, maintenance and the like of the blast furnace after production. With the progress of iron-making technology, the limiting factor of the long service life of the large-scale blast furnace is mainly concentrated on the hearth part, especially on the corrosion of the elephant foot of the hearth, and the further improvement of the service life of the blast furnace is greatly restricted. When the temperature of the side wall of the hearth rises and is not effectively controlled, the blast furnace can only passively adopt measures such as titanium ore furnace protection, smelting strength reduction, tuyere blockage and the like, and the measures can influence the normal production of the blast furnace and also indicate that the blast furnace enters the later stage of the furnace service. Therefore, measures should be taken and controlled within a reasonable range at the initial stage of the temperature rise of the hearth side wall, so as to keep the long-term stable and smooth running of the blast furnace and the long service life of the blast furnace.
Disclosure of Invention
The invention aims to provide a method for prolonging the service life of a blast furnace hearth, when the blast furnace adopts center coke feeding, high-quality coke and large coke are distributed at the center of the blast furnace to replace the coke at the dead stock column part, thereby improving the quality of the coke at the center of the blast furnace, improving the permeability and the liquid permeability of the dead stock column of the hearth, leading more molten iron and slag to pass through the dead stock column at the center of the hearth, obviously relieving the circulation of the molten iron, protecting carbon bricks on the side wall of the hearth and prolonging the service life of the hearth; when the central coke proportion is lower, the updating speed of the dead material column of the hearth can be accelerated by properly improving the central coke proportion, the activity of the hearth is effectively improved, the method has the characteristics of strong operability, simple process and easy realization, and the problems in the background technology are effectively solved.
The technical scheme of the invention is as follows: a method for prolonging the service life of a blast furnace hearth adopts a central coke charging distribution system, and the weight of central coke in each batch accounts for 5-35% of the weight of coke charged into the blast furnace.
The charging sequence of different types of coke can be adjusted, and the type of the central coke can be controlled.
When the temperature of the side wall of the hearth is in an ascending trend, if the central coke proportion is lower, the central coke proportion is properly improved.
When the temperature of the side wall of the hearth is in the rising trend, if the quality of the coke is poor, the dead material column coke can be directly updated by improving the quality of the coke.
The coke quality mainly comprises: cold state performance, M10 and M40; thermal state performance: reactivity CRI, post-reaction strength CSR, and coke average particle size.
When the temperature of the side wall of the hearth is in an ascending trend, if only part of coke has good quality, high-quality coke is distributed in the center of the blast furnace and poor coke is distributed at the edge and the middle position by adjusting the distribution sequence.
When the temperature of the side wall of the hearth is in the rising trend, if the coke quality is integrally poor and the coke quality is difficult to improve, the large coke with the thickness of 40-60 mm is distributed in the center of the blast furnace through the distribution sequence adjustment.
If the temperature of the side wall of the hearth still rises, a method for improving the utilization rate of coal gas is adopted, the deterioration degree of coke in the blast furnace is reduced, the granularity of the coke in the hearth is improved, and the hearth is activated.
The invention has the beneficial effects that: when the blast furnace adopts center coke feeding, high-quality coke and large coke are distributed at the center of the blast furnace to replace the coke at the dead material column part, so that the quality of the coke at the center of the blast furnace is improved, the air permeability and the liquid permeability of the dead material column of the hearth are improved, more molten iron and slag pass through the dead material column at the center of the hearth, the circulation of the molten iron can be obviously relieved, carbon bricks on the side wall of the hearth are protected, and the service life of the hearth is prolonged; when the proportion of the central coke is lower, the updating speed of the dead material column of the hearth can be accelerated by properly improving the proportion of the central coke, the activity of the hearth is effectively improved, and the method has the characteristics of strong operability, simple process and easy realization.
Drawings
FIG. 1 is a schematic diagram of the coke distribution of the present invention;
in the figure: coke 1 with poor quality of small granularity at the edge and the middle part, high quality coke 2 with large granularity at the central part and a furnace wall 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A method for prolonging the service life of blast furnace hearth is disclosed, wherein the blast furnace adopts a central coke charging distribution system, and the weight of the central coke in each batch of materials accounts for 5% -35% of the weight of the coke charged into the furnace.
The charging sequence of different types of coke can be adjusted, and the type of the central coke can be controlled.
When the temperature of the side wall of the hearth is in an ascending trend, if the central coke proportion is lower, the central coke proportion is properly improved.
When the temperature of the side wall of the hearth is in the rising trend, if the quality of the coke is poor, the dead material column coke can be directly updated by improving the quality of the coke.
The coke quality mainly comprises: cold state performance, M10 and M40; thermal state performance: reactivity CRI, post-reaction strength CSR, and coke average particle size.
When the temperature of the side wall of the hearth is in an ascending trend, if only part of coke has good quality, high-quality coke is distributed in the center of the blast furnace and poor coke is distributed at the edge and the middle position by adjusting the distribution sequence.
When the temperature of the side wall of the hearth is in the rising trend, if the coke quality is integrally poor and the coke quality is difficult to improve, the large coke with the thickness of 40-60 mm is distributed in the center of the blast furnace through the distribution sequence adjustment.
If the temperature of the side wall of the hearth still rises, a method for improving the utilization rate of coal gas is adopted, the deterioration degree of coke in the blast furnace is reduced, the granularity of the coke in the hearth is improved, and the hearth is activated.
The present invention will be described in further detail with reference to specific examples.
Example 1:
the effective volume of the blast furnace is 3200m3, the central coke proportion is 10 percent, the temperature of the carbon brick at one part of the side wall of the hearth is increased from 100 ℃ to 300 ℃, and the temperature is in a trend of increasing continuously.
The proportion of the central coke is increased from 10% to 15%, the blast furnace stably moves forward, and the temperature of the carbon bricks on the side wall of the hearth is reduced.
Example 2:
the effective volume of the blast furnace is 3200m3, the central coke proportion is 25 percent, and the coke quality is as follows: m10: 6.5%, M40: 85%, CRI: 27%, CSR: and 64 percent. The temperature of the carbon brick at one part of the side wall of the hearth is increased from 100 ℃ to 300 ℃ and is in a trend of continuously increasing.
Improve coke quality to M10: 6.2%, M40: 88%, CRI: 25%, CSR: 67%, the blast furnace stably moves forward, and the temperature of the carbon bricks on the side wall of the hearth is reduced.
Example 3:
the effective volume of the blast furnace is 3200m3, the central coke proportion is 25 percent, and the charging coke proportion structure is as follows: 50 percent of high-quality coke and 50 percent of poor coke, and the two kinds of coke are mixed and fed into the furnace. The temperature of the carbon brick at one part of the side wall of the hearth is increased from 200 ℃ to 400 ℃ and is in a trend of continuously increasing.
The two kinds of coke are separated into bins, the discharge time is adjusted, high-quality coke is distributed at the central part of the blast furnace, the blast furnace stably moves forwards, and the temperature of carbon bricks on the side wall of the hearth is reduced.
Example 4:
effective volume of the blast furnace is 3200m3, central coke proportion is 30%, charging coke: 100% poor coke. The temperature of the carbon brick at one part of the side wall of the hearth is increased from 200 ℃ to 400 ℃ and is in a trend of continuously increasing.
Screening out 40-60 mm large coke, putting the large coke into a bin independently, adjusting the discharge time, and distributing the 40-60 mm large coke at the central part of the blast furnace, so that the blast furnace stably moves forward, and the temperature of carbon bricks on the side wall of the hearth is reduced.
Example 5:
the effective volume of the blast furnace is 3200m3, the central coke proportion is 30 percent, and the coal gas utilization rate is 42 percent. The temperature of the carbon brick at one part of the side wall of the hearth is increased from 100 ℃ to 300 ℃ and is in a trend of continuously increasing.
The utilization rate of coal gas is improved to more than 45 percent, the blast furnace is stably and smoothly operated, and the temperature of the carbon bricks on the side wall of the hearth is reduced.
Claims (8)
1. A method for prolonging the service life of a blast furnace hearth is characterized in that: the blast furnace adopts a central coke charging distribution system, and the weight of central coke in each batch accounts for 5-35% of the weight of coke charged into the furnace.
2. The method for prolonging the service life of the blast furnace hearth according to claim 1, wherein the method comprises the following steps: the charging sequence of different types of coke can be adjusted, and the type of the central coke can be controlled.
3. The method for prolonging the service life of the blast furnace hearth according to claim 1, wherein the method comprises the following steps: when the temperature of the side wall of the hearth is in an ascending trend, if the central coke proportion is lower, the central coke proportion is increased.
4. The method for prolonging the service life of the blast furnace hearth according to claim 1, wherein the method comprises the following steps: when the temperature of the side wall of the hearth is in the rising trend, if the coke quality is integrally poor, the dead material column coke is directly updated by improving the coke quality.
5. The method for prolonging the service life of the blast furnace hearth according to claim 4, wherein the method comprises the following steps: the coke quality comprises: cold state performance, M10 and M40; thermal state performance: reactivity CRI, post-reaction strength CSR, and coke average particle size.
6. The method for prolonging the service life of the blast furnace hearth according to claim 1, wherein the method comprises the following steps: when the temperature of the side wall of the hearth is in an ascending trend, if only part of coke has good quality, high-quality coke is distributed in the center of the blast furnace and poor coke is distributed at the edge and the middle position by adjusting the distribution sequence.
7. The method for prolonging the service life of the blast furnace hearth according to claim 1, wherein the method comprises the following steps: when the temperature of the side wall of the hearth is in the rising trend, if the coke quality is poor, large coke with the thickness of 40-60 mm is distributed in the center of the blast furnace through the distribution sequence adjustment.
8. The method for prolonging the service life of the blast furnace hearth according to claim 1, wherein the method comprises the following steps: if the temperature of the side wall of the hearth still rises, a method for improving the utilization rate of coal gas is adopted, the deterioration degree of coke in the blast furnace is reduced, the granularity of the coke in the hearth is improved, and the hearth is activated.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114990268A (en) * | 2022-06-21 | 2022-09-02 | 首钢集团有限公司 | Material distribution method of blast furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101285108A (en) * | 2008-05-30 | 2008-10-15 | 重庆钢铁(集团)有限责任公司 | Process for charging in bell-less top of blast furnace |
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2021
- 2021-11-25 CN CN202111414023.3A patent/CN114350862A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101285108A (en) * | 2008-05-30 | 2008-10-15 | 重庆钢铁(集团)有限责任公司 | Process for charging in bell-less top of blast furnace |
Non-Patent Citations (4)
| Title |
|---|
| 余水生等: "柳钢5号高炉炉缸侧壁安全维护的实践", 《炼铁》 * |
| 周松: "焦炭劣化对炉况的影响", 《中国金属通报》 * |
| 徐万仁等: "高炉炉缸活性状态的表征及改善途径", 《炼铁》 * |
| 李传辉等: "高炉中心加焦技术探讨", 《第八届（2011）中国钢铁年会论文集》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114990268A (en) * | 2022-06-21 | 2022-09-02 | 首钢集团有限公司 | Material distribution method of blast furnace |
| CN114990268B (en) * | 2022-06-21 | 2023-08-11 | 首钢集团有限公司 | Material distribution method of blast furnace |
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