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Coke breeze-containing mixed fuel for blast furnace coal injection and preparation method thereof

A technology of mixed fuel and blast furnace coal injection, which is applied in the fields of blast furnace pulverized coal injection and blast furnace ironmaking, can solve the problem of high cost of mixed fuel for blast furnace coal injection, improve the comprehensive utilization of resources, reduce costs, and reduce solid waste generation volume effect

Pending Publication Date: 2020-12-11
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a mixed fuel for blast furnace coal injection containing coke powder and its preparation method, which mainly solves the technical problem of high cost of the mixed fuel for blast furnace coal injection in the prior art; the method of the invention can make full use of blast furnace ironmaking The coke powder produced in the process reduces the cost of mixed fuel for blast furnace coal injection

Method used

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  • Coke breeze-containing mixed fuel for blast furnace coal injection and preparation method thereof
  • Coke breeze-containing mixed fuel for blast furnace coal injection and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] Example 1, the calorific value of bituminous coal in the mixed fuel is 27957.85kJ / kg, and the combustion rate is 76.77%; the calorific value of anthracite is 30709.39J / kg, and the combustion rate is 59.72%; The combustion rate is 64.61%; the calorific value of the coke powder prefabricated powder is 34601.02kJ / kg, and the combustion rate is 45.23%; the ingredients of the raw materials in Example 1 are shown in Table 4.

[0036] Table 4 The raw material components of Example 1 of the present invention, unit: weight percent.

[0037] category fixed carbon Ash Volatile matter Sulfur content bituminous coal 62.64 5.72 31.64 0.42 anthracite 79.42 10.88 9.7 0.48 semi charcoal 74.72 11.78 13.5 0.32 charcoal prefabricated powder 87.62 11.3 1.08 0.66

[0038] Mixed fuel for 3200m 3 When the blast furnace is blown, the process control parameters are: hot air temperature 1150°C, oxygen enrichment rate 1%, blast humidity 1%,...

Embodiment 2

[0039] Embodiment 2, the calorific value and combustion rate of bituminous coal in the mixed fuel, the calorific value and combustion rate of anthracite; the calorific value and combustion rate of semi-coke and the calorific value and combustion rate of coke powder prefabricated powder are the same as embodiment 1; embodiment 2 Each raw material composition is with embodiment 1.

[0040] Mixed fuel for 3200m 3 When the blast furnace is injected, the process control parameters are the same as in Example 1; the indicators for smelting one ton of molten iron produced by the blast furnace are as follows: coal ratio: 146kg / t; coke ratio: 385kg / t; fuel ratio: 531kg / t; hot air temperature: 1150°C ; Theoretical combustion temperature: 2226°C; Heat loss: 6.069%; Bosh gas: 1462.32m 3 / t; direct reduction degree: 0.51; gas utilization rate: 0.454; slag basicity: 1.14; injection cost: 132.7 yuan / t.

Embodiment 3

[0041] Embodiment 3, the calorific value and combustion rate of bituminous coal in the mixed fuel, the calorific value and combustion rate of anthracite; the calorific value and combustion rate of semi-coke and the calorific value and combustion rate of coke powder prefabricated powder are the same as embodiment 1; embodiment 3 Each raw material composition is with embodiment 1.

[0042] Mixed fuel for 3200m 3 When the blast furnace is injected, the process control parameters are the same as in Example 1; the indicators for blast furnace production and smelting one ton of molten iron are as follows: coal ratio: 148kg / t; coke ratio: 385kg / t; fuel ratio: 533kg / t; hot air temperature: 1150°C; Theoretical combustion temperature: 2220°C; Heat loss: 6.046% Bosh gas: 1467.85m 3 / t; direct reduction degree: 0.51; gas utilization rate: 0.451; slag basicity: 1.15; injection cost: 117.38 yuan / t.

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Abstract

The invention discloses coke breeze-containing mixed fuel for blast furnace coal injection and a preparation method thereof, and the technical problem of high cost of mixed fuel for blast furnace coalinjection in the prior art is mainly solved. The coke breeze-containing mixed fuel for blast furnace coal injection comprises the following raw material components of, by weight, 5%-20% of coke breeze prefabricated powder, 25%-50% of bituminous coal, 5%-45% of anthracite and 10%-25% of semi-coke, and the sum of the weight percentages of all the raw material components is 100%. The coke breeze prefabricated powder comprises the following components of, by weight, 85%-89% of fixed carbon, 9%-13% of ash and 1.0%-1.5% of volatile components. The Hastelloy grindability index of the coke breeze prefabricated powder is 25-45. Under the condition that the mixed fuel meets the blast furnace smelting production requirements, the consumption of the anthracite is greatly reduced, and the cost of themixed fuel for blast furnace coal injection is reduced.

Description

technical field [0001] The invention relates to a fuel for blast furnace coal injection, in particular to a coke powder-containing mixed fuel for blast furnace coal injection and a preparation method thereof, belonging to the technical fields of blast furnace pulverized coal injection and blast furnace ironmaking. Background technique [0002] At present, more than 80% of the world's pig iron is produced by blast furnace smelting. The three high problems faced by the blast furnace ironmaking process: high energy consumption, high environmental load, and high dependence on fossil resources have not yet been resolved. [0003] Blast furnace smelting aims at the lowest cost of smelting pig iron, and iron and steel enterprises are constantly improving and developing new smelting processes and methods according to their own raw material conditions and equipment capabilities. Energy consumption accounts for the highest proportion of the cost expenditure of iron and steel enterpris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCC21B5/007C21B5/003
Inventor 毕传光张建良王广伟彭政富孙俊杰
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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