CN113832269B - 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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- CN113832269B CN113832269B CN202111108137.5A CN202111108137A CN113832269B CN 113832269 B CN113832269 B CN 113832269B CN 202111108137 A CN202111108137 A CN 202111108137A CN 113832269 B CN113832269 B CN 113832269B
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- C21—METALLURGY OF IRON
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- 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 coke-charging method for reducing coke ratio of a blast furnace, which uses the center of the blast furnaceThe coke-charging operation method is based on adding a certain amount of high-reactivity semicoke into coke arranged in the central area of a blast furnace to reduce CO 2 React 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 long-term stable and smooth running of the blast furnace condition can be ensured by reducing the coke ratio of the blast furnace, and further, the smelting cost of the blast furnace is reduced. 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, wherein vanadium-titanium sinter treated by a sinter inhibitor is distributed, and 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 the blast furnace ironmaking process with poorer low-temperature reduction degradation indexes of sinter, and has adaptability to ironmaking furnace burden with better metallurgical performanceIs weaker; patent 201010151110.X discloses a process method for reducing blast furnace ironmaking coke ratio, mainly by improving SiO of blending stock pile 2 Qualified rate, stable uniform mixing material pile SiO 2 The 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 CO 2 The method reduces the coke ratio of the blast furnace from the perspective of generating CO by reacting with the central coke of the blast furnace, has the characteristics of simple process, safe operation and easy implementation, and has great significance for reducing the use amount of the coke 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-adding material distribution mode during blast furnace iron making;
when the coke is charged and distributed at the center, a preset amount of high-reactivity semi-coke is added into the coke to reduce the coke ratio of the blast furnace.
Preferably, the coke has 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 51mm.
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 highly reactive semicoke is added to the coke, the coke is distributed first and then the highly reactive semicoke is added.
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, compared with the conventional central coking cloth feeding mode (i.e. compared with the condition that only coke is added into the central coking cloth without adding the semicoke), the coke edge cloth angle is improved by 0.1-1 ℃ after the high-reactivity semicoke 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 coking method for reducing the coke ratio of the blast furnace is based on the blast furnace center coking operation method, and a certain amount of high-reactivity semicoke is added into the coke arranged in the center area of the blast furnace, so that CO can be reduced 2 The 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 central coking method for reducing the coke ratio of a blast furnace, which is characterized in that a certain proportion of high-reactivity semicoke is arranged in the central area of the blast furnace on the basis of central coking. The addition of the high-reactivity semi-coke can reduce the reaction and pulverization degree of the coke and inhibit CO 2 The coke reacts with the coke, thereby reducing the consumption of the coke in the blast furnace, delaying the granularity 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 feeding and distributing mode in blast furnace iron making, a certain amount of high-reactivity semi-coke is added into coke and distributed in a central area of a blast furnace, and the deterioration degree of the coke is reduced by adjusting the adding amount of the high-reactivity semi-coke and the coke, so that the aim of replacing part of the coke with the low-cost high-reactivity semi-coke is fulfilled, and the fuel cost of the blast furnace is reduced.
Wherein, the coke needs to meet the conditions that include: 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, and the average granularity is more than or equal to 51mm. The conditions to be met by the highly reactive carbocoal 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 part with the granularity less than 20mm accounts for 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 central coke charge to the top charge 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 is more than or equal to 51.2mm. 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, wherein the M25 of the coke is more than or equal to 92.6 percent, the M10 is less than or equal to 6.5 percent, the CSR is more than or equal to 61.7 percent, the proportion of the part with the granularity range of 25-40mm is less than or equal to 19.2 percent, and the average granularity is more than or equal to 51.6mm. 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 of the high-reactivity semicoke 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 of more than or equal to 40.7mm, and the CRI of 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 the M25 of the coke is more than or equal to 93.4 percent, the M10 of the coke is less than or equal to 5.9 percent, the CSR of the coke 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 of the part is more than or equal to 51.9mm. Then high-reactivity semicoke is added, 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 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 (2)
1. A central coke feeding method for reducing the coke ratio of a blast furnace is characterized by comprising the following steps:
a central coke-adding and distributing mode is adopted during blast furnace iron making;
when the center is charged with coke and distributed, a preset amount of high-reactivity semicoke is added into the coke to reduce the coke ratio of the blast furnace;
the coke needs to meet the conditions comprising: 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 51mm;
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;
when a preset amount of high-reactivity semi-coke is added into the coke, firstly distributing the coke and then adding the high-reactivity semi-coke;
compared with the mode of only adding coke in the center coke adding and distributing material, the height of the material line is reduced by 0.1-0.3m when the material is distributed in the center coke adding and distributing material;
compared with the mode of only adding coke in the center coke adding and distributing, the center coke distributing angle is improved by 0.1-2 degrees when the center coke adding and distributing is carried out;
compared with the mode of only adding coke in the center coke adding and distributing material, the coke edge distributing angle is improved by 0.1-1 degree when the center coke adding and distributing material is added;
the mass ratio of the high-reactivity semicoke to the coke is (0.01-0.35): 1;
the central coke adding amount is 15-25% of the fuel amount charged into the furnace top.
2. The center-feeding method for reducing the coke ratio of a blast furnace according to claim 1, wherein the reduction range of the coke ratio of the blast furnace is 0.8 to 2.3 percent.
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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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