CN113832269A - Central coke feeding method for reducing coke ratio of blast furnace - Google Patents
Central coke feeding method for reducing coke ratio of blast furnace Download PDFInfo
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- CN113832269A CN113832269A CN202111108137.5A CN202111108137A CN113832269A CN 113832269 A CN113832269 A CN 113832269A CN 202111108137 A CN202111108137 A CN 202111108137A CN 113832269 A CN113832269 A CN 113832269A
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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
- C21B5/007—Conditions of the cokes or characterised by the cokes used
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Abstract
The invention discloses a center coking method for reducing the coke ratio of a blast furnace, which is based on a blast furnace center coking operation method and adds a certain amount of high-reactivity semicoke into coke arranged in a central area of the blast furnace to reduce CO2React with coke to form CO. The invention improves the utilization rate of the coke, and can reduce the usage amount of the coke, thereby reducing the coke ratio of the blast furnace. The invention has simple process, safe operation and easy implementation.
Description
Technical Field
The invention belongs to the technical field of iron making, and particularly relates to a central coking method for reducing the coke ratio of a blast furnace.
Background
The kilogram number of coke consumed by each ton of pig iron smelted by the blast furnace is expressed by coke ratio, the coke ratio is a main technical and economic index of blast furnace ironmaking, and the levels of blast furnace ironmaking raw materials, fuels, equipment and technical operation are comprehensively reflected. The reduction of the coke ratio of the blast furnace can ensure the long-term stable and smooth operation of the furnace condition of the blast furnace, thereby reducing the smelting cost of the blast furnace. At present, the coke adding amount at the center of a blast furnace is generally higher and can reach about 20 percent of the batch weight of coke, although the coke adding amount plays a great role in the smooth operation of the blast furnace, the center over-blowing is easily caused, the temperature at the center of the furnace top is higher, and the coke ratio is higher. Therefore, the development of the method for reducing the iron-making coke ratio of the blast furnace has important practical significance.
Patent 201710911705.2 discloses a blast furnace smelting method for reducing coke ratio, which comprises distributing vanadium-titanium sinter treated by sinter inhibitor, wherein the sinter inhibitor uniformly covers the surface, cracks and pores of the sinter. In the blast furnace smelting process, the contact between the reducing gas and the sinter can be hindered, the low-temperature reduction degradation rate of the vanadium-titanium sinter is reduced, and the air permeability of the furnace charge is improved, so that the coke ratio of the blast furnace is reduced. The method is mainly applied to a blast furnace ironmaking process with poorer index of low-temperature reduction degradation of sinter, and has weaker adaptability to ironmaking furnace burden with better metallurgical performance; patent 201010151110.X discloses a process for reducing blast furnace ironmaking coke ratio by improving SiO of blending stock pile2Qualified rate, stable uniform mixing material pile SiO2The fluctuation interval further reduces the blast furnace ironmaking coke ratio. The patent is mainly applicable to the field with poor raw material stability. In summary, the coke ratio reduction of the blast furnace is mainly started from the aspects of raw material performance improvement and index stability, and the consideration on the aspect of reducing the coke ratio in the blast furnace operation is less.
Disclosure of Invention
To solve the problems in the prior art, the invention aims to provide a center coke feeding method for reducing the coke ratio of a blast furnace, which aims to reduce CO2The method reduces the coke ratio of the blast furnace from the viewpoint of generating CO by reacting with the coke in the center of the blast furnace, has the characteristics of simple process, safe operation and easy implementation, and has great significance for reducing the coke use amount and practical application.
The technical scheme adopted by the invention is as follows:
a central coking method for reducing the coke ratio of a blast furnace comprises the following steps:
adopting a central coke charging and distributing mode during blast furnace ironmaking;
when the coke is charged and distributed in the center, a preset amount of high-reactivity semicoke is added into the coke to reduce the coke ratio of the blast furnace.
Preferably, the coke satisfies the following conditions: m25 is more than or equal to 92 percent, M10 is less than or equal to 7.0 percent, CSR is more than or equal to 60 percent, the proportion of the part with the granularity range of 25-40mm is less than or equal to 20 percent, the maximum grain diameter is 80mm, and the average grain diameter is more than or equal to 51 mm.
Preferably, the condition satisfied by the highly reactive semicoke includes: m25 is more than or equal to 70 percent, M10 is less than or equal to 5 percent, CSR is more than or equal to 20 percent, the proportion of the part with the granularity less than 20mm is less than or equal to 10 percent, the maximum grain diameter is 45mm, the average grain diameter is more than or equal to 40mm, and CRI is more than or equal to 55 percent.
Preferably, the mass ratio of the highly reactive semicoke to the coke is (0.01-0.35): 1.
preferably, when a predetermined amount of the high reactivity semicoke is added to the coke, the high reactivity semicoke is added after the coke is distributed.
Preferably, in the present invention, the stockline height is reduced by 0.1 to 0.3m after the addition of the highly reactive semicoke, as compared with the conventional center-charging cloth method (i.e., as compared with the case where only coke is added to the center-charging cloth without adding semicoke).
Preferably, in the present invention, the coke center distribution angle is increased by 0.1 to 2 degrees after the addition of the highly reactive semi-coke, as compared to the conventional center-coke-charging distribution method (i.e., as compared to the case where only coke is added to the center-coke-charging distribution and no semi-coke is added).
Preferably, in the present invention, the coke edge distribution angle is increased by 0.1 to 1 ° after the addition of the highly reactive semi-coke, as compared to the conventional center-charging distribution method (i.e., as compared to the case where only coke is added to the center-charging distribution and no semi-coke is added).
Preferably, the central coke addition is 15% to 25% of the amount of top-charged fuel.
Preferably, in the invention, the central coke feeding method for reducing the coke ratio of the blast furnace can reduce the coke ratio of the blast furnace by 0.8-2.3%.
The invention has the following beneficial effects:
the center coke-charging method for reducing the coke ratio of the blast furnace is based on the operation method of the center coke-charging of the blast furnace, and the coke is distributed in the coke arranged in the center area of the blast furnaceAdding a certain amount of high-reactivity semicoke to reduce CO2The invention improves the utilization rate of the coke and can reduce the using amount of the coke, thereby reducing the coke ratio of the blast furnace. The invention has simple process, safe operation and easy implementation.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention discloses a center coking method for reducing the coke ratio of a blast furnace, which is to arrange a certain proportion of high-reactivity semicoke in the center area of the blast furnace on the basis of center coking. The addition of the high-reactivity semicoke can reduce the reaction and pulverization degree of the coke and inhibit CO2The coke reacts with the coke, thereby reducing the consumption of the coke in the blast furnace, delaying the particle size attenuation degree of the coke, stabilizing the liquid permeability of a dead material column of the hearth, improving the activity of the hearth and reducing the coke ratio.
The specific scheme of the center coke-charging method for reducing the coke ratio of the blast furnace is as follows:
on the basis of adopting a central coke charging and distributing mode in blast furnace iron making, a certain amount of high-reactivity semicoke is added into coke and distributed in the central area of the blast furnace, and the deterioration degree of the coke is reduced by adjusting the adding amount of the high-reactivity semicoke and the coke, so that the aim of replacing part of the coke with the low-cost high-reactivity semicoke is achieved, and the fuel cost of the blast furnace is reduced.
Wherein, the coke needs to meet the conditions that include: more than or equal to 92 percent of M25, less than or equal to 7.0 percent of M10, more than or equal to 60 percent of CSR, less than or equal to 20 percent of part with the granularity range of 25-40mm, and more than or equal to 51mm of average granularity. The conditions to be satisfied by the highly reactive semicoke include: m25 is more than or equal to 70 percent, M10 is less than or equal to 5 percent, CSR is more than or equal to 20 percent, the proportion of the part with the granularity less than 20mm is less than or equal to 10 percent, the average granularity is more than or equal to 40mm, and CRI is more than or equal to 55 percent. The central coke adding amount is 15-25% of the amount of the fuel (semicoke and coke) charged into the furnace top. The mass ratio of the high-reactivity semicoke to the coke in the blast furnace central area is (0.01-0.35): 1. compared with the conventional central coke feeding and distributing mode, after the high-reactivity semi-coke is fed, the method needs to reduce the height of a material line by 0.1-0.3m, improve the distributing angle of the coke center by 0.1-2 degrees and improve the distributing angle of the coke edge by 0.1-1 degrees. When the semicoke is loaded into the furnace, the semicoke is added after the coke is distributed in the material tank, and the coke preferentially falls into the central area in the furnace.
From the above, it can be seen that the present invention gives certain metallurgical performance requirements to coke and highly reactive semicoke, including M25, M10, CSR, CRI, average particle size, etc., controls the ratio of the amount of central coke charge to the amount of top-charged fuel (semicoke + coke), and the mass ratio of highly reactive semicoke to coke. Meanwhile, the height of a stock line is reduced, the material distribution angle of the center of the coke is improved, and the material distribution angle of the edge of the coke is improved. And then the method for reducing the coke ratio of the blast furnace, which has simple process, safe operation and easy implementation, is designed, can reduce the usage amount of the blast furnace coke, and has important significance in practical application.
Example 1
In the center coke-charging method for reducing the coke ratio of the blast furnace in the embodiment, the center coke-charging amount is 15% of the top fuel charging amount (semicoke + coke). Coke is distributed in the charging tank firstly, wherein the M25 of the coke is more than or equal to 92.1 percent, the M10 of the coke is less than or equal to 7.0 percent, the CSR of the coke is more than or equal to 60.2 percent, the proportion of the part with the particle size range of 25-40mm is less than or equal to 20.0 percent, and the average particle size of the part with the particle size range of 51.2mm is more than or equal to 51.2 mm. And then adding high-reactivity semicoke, wherein the M25 of the high-reactivity semicoke is more than or equal to 70.5 percent, the M10 is less than or equal to 5.0 percent, the CSR is more than or equal to 20.3 percent, the proportion of the part with the particle size of less than 20mm is less than or equal to 10.0 percent, the average particle size is more than or equal to 40.9mm, and the CRI is more than or equal to 55.2 percent. The coke preferentially falls into a central area in the furnace, and the mass ratio of the high-reactivity semicoke to the coke in the central area of the furnace is 0.01: 1. the burden distribution system of the blast furnace is correspondingly adjusted, wherein the height of a burden line is reduced by 0.1m, the burden distribution angle of the center of coke is improved by 0.1 degrees, and the burden distribution angle of the edge of coke is improved by 0.1 degrees.
The coke ratio was reduced by 0.8% by the above adjustment.
Example 2
In the center coke-charging method for reducing the coke ratio of the blast furnace in the embodiment, the center coke-charging amount is 20% of the top fuel charging amount (semicoke + coke). Coke is distributed in the charging tank firstly, wherein M25 of the coke is more than or equal to 92.6 percent, M10 is less than or equal to 6.5 percent, CSR is more than or equal to 61.7 percent, the proportion of the part with the particle size range of 25-40mm is less than or equal to 19.2 percent, and the average particle size is more than or equal to 51.6 mm. And then adding high-reactivity semicoke, wherein the M25 of the high-reactivity semicoke is more than or equal to 71.7 percent, the M10 is less than or equal to 5.0 percent, the CSR is more than or equal to 20.5 percent, the proportion of the part with the granularity of less than 20mm is less than or equal to 9.8 percent, the average granularity is more than or equal to 40.7mm, and the CRI is more than or equal to 56.4 percent. The coke preferentially falls into the central area in the furnace, and the mass ratio of the high-reactivity semicoke to the coke in the central area of the furnace is 0.18: 1. the burden distribution system of the blast furnace is correspondingly adjusted, wherein the height of a burden line is reduced by 0.2m, the burden distribution angle of the center of coke is improved by 1 degree, and the burden distribution angle of the edge of coke is improved by 0.5 degree.
The coke ratio was reduced by 1.5% by the above adjustment.
Example 3
In the center coke-charging method for reducing the coke ratio of the blast furnace in the embodiment, the center coke-charging amount is 25% of the top fuel charging amount (semicoke + coke). Coke is distributed in the charging tank firstly, wherein M25 of the coke is more than or equal to 93.4 percent, M10 is less than or equal to 5.9 percent, CSR is more than or equal to 62.3 percent, the proportion of the part with the particle size range of 25-40mm is less than or equal to 18.6 percent, and the average particle size is more than or equal to 51.9 mm. And then adding high-reactivity semicoke, wherein the M25 of the high-reactivity semicoke is more than or equal to 72.8 percent, the M10 is less than or equal to 5.0 percent, the CSR is more than or equal to 20.7 percent, the proportion of the part with the granularity of less than 20mm is less than or equal to 9.4 percent, the average granularity is more than or equal to 40.3mm, and the CRI is more than or equal to 57.1 percent. The coke preferentially falls into the central area in the furnace, and the mass ratio of the high-reactivity semicoke to the coke in the central area of the furnace is 0.35: 1. the burden distribution system of the blast furnace is correspondingly adjusted, wherein the height of a burden line is reduced by 0.3m, the burden distribution angle of the center of coke is improved by 2 degrees, and the burden distribution angle of the edge of coke is improved by 1 degree.
The coke ratio was reduced by 2.3% by the above adjustment.
Claims (10)
1. A central coking method for reducing the coke ratio of a blast furnace is characterized by comprising the following steps:
adopting a central coke charging and distributing mode during blast furnace ironmaking;
when the coke is charged and distributed in the center, a preset amount of high-reactivity semicoke is added into the coke to reduce the coke ratio of the blast furnace.
2. The center-feeding method for reducing the coke ratio of a blast furnace as claimed in claim 1, wherein the coke is required to satisfy the following conditions: m25 is more than or equal to 92 percent, M10 is less than or equal to 7.0 percent, CSR is more than or equal to 60 percent, the proportion of the part with the granularity range of 25-40mm is less than or equal to 20 percent, the maximum grain diameter is 80mm, and the average grain diameter is more than or equal to 51 mm.
3. The center-feeding method for reducing the coke ratio of a blast furnace as claimed in claim 1, wherein the condition satisfied by the high reactivity semicoke comprises: m25 is more than or equal to 70 percent, M10 is less than or equal to 5 percent, CSR is more than or equal to 20 percent, the proportion of the part with the granularity less than 20mm is less than or equal to 10 percent, the maximum grain diameter is 45mm, the average grain diameter is more than or equal to 40mm, and CRI is more than or equal to 55 percent.
4. The center-charging method for reducing the coke ratio of a blast furnace as claimed in claim 1, wherein the mass ratio of the high reactivity semicoke to the coke is (0.01-0.35): 1.
5. the center-charging method for reducing the coke ratio of a blast furnace as claimed in claim 1, wherein when a predetermined amount of the high reactivity semicoke is added to the coke, the high reactivity semicoke is added after the coke is distributed.
6. The center-charging method for reducing the coke ratio of a blast furnace as claimed in claim 1, wherein the stockline height is reduced by 0.1-0.3m when the center-charging cloth is charged compared with the method of charging only coke in the center-charging cloth.
7. The center-charging method for reducing the coke ratio of a blast furnace as claimed in claim 1, wherein the center-charging angle of the coke is increased by 0.1-2 ° when the center-charging cloth is charged compared with the method of charging only the coke on the center-charging cloth.
8. The center-charging method for reducing the coke ratio of a blast furnace as claimed in claim 1, wherein the coke edge charging angle is increased by 0.1 ° to 1 ° when the center-charging cloth is charged with the coke alone, as compared with the center-charging cloth charged with the coke alone.
9. The center-coking method for reducing the coke ratio of a blast furnace according to claim 1, wherein the center-coking amount is 15 to 25 percent of the amount of top-charged fuel.
10. The method of any one of claims 1 to 10, wherein the reduction of the coke ratio of the blast furnace is in the range of 0.8% to 2.3%.
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| CN115747395A (en) * | 2022-11-28 | 2023-03-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting open center of vanadium-titanium-iron ore in blast furnace |
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