Method for matching mixed coal with relatively high heating value

A technology with high calorific value and high calorific value, which is applied in the field of ironmaking and can solve problems such as the lack of research on mixing and matching of pulverized coal

Pending Publication Date: 2022-03-22
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Although the above literatures have explained how to improve the combustion rate and/or calorific value of pulverized coal from different aspects, t...

Method used

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  • Method for matching mixed coal with relatively high heating value
  • Method for matching mixed coal with relatively high heating value
  • Method for matching mixed coal with relatively high heating value

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: the determination of mixed coal components and proportioning

[0023] Several groups of mixed coal experimental schemes were designed using the orthogonal method, and the details of each scheme are shown in Table 1:

[0024] Table 1 Experimental scheme of combustion performance of mixed coal

[0025]

[0026]

[0027] It can be seen from Table 1 that the dry basis volatile content is 8.86% under the condition of full anthracite injection, and 32.76% under the condition of full bituminous coal injection. The fixed carbon is gradually reduced, and the ash content is also gradually reduced. In experiment number 6, when the mixed coal is 50% anthracite + 50% bituminous coal, the fixed carbon is 70.66%, and the volatile matter on a dry basis is 20.81%.

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Abstract

The invention discloses a matching method of mixed coal with a relatively high heating value. The method comprises the following steps: 1) selecting bituminous coal and anthracite as components of the mixed coal; 2) designing a 6-17 coal blending scheme according to all-anthracite injection and all-series coal blending thoughts of all-anthracite injection, designing a coal injection framework according to anthracite proportion decreasing by m% and bituminous coal increasing by m%, and determining the matching ratio of mixed coal, m being 6.25-20; and 3) selecting the scheme with the highest intersection degree of the combustion rate and the exothermic value index as the scheme of the invention. The anthracite and the bituminous coal are mixed and injected according to a certain proportion, and meanwhile, the dry basis volatile component and the ash content of the mixed coal are well controlled, so that combustion can be mutually promoted, the actual coke replacement ratio of a blast furnace is increased, the explosiveness of the mixed coal powder is greatly reduced, the combustion performance is relatively improved, the generation amount of unburned coal powder is reduced, and the production cost is reduced. And smooth operation of the blast furnace is facilitated.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to a method for mixing mixed coal with relatively high calorific value. Background technique [0002] Under the current technical conditions, it is impossible to burn all the pulverized coal before the tuyere, and the remaining part will enter the furnace in the form of unburned coal, and then be consumed by participating in various reactions. However, if the amount of unburned coal powder is too much, the gas channel will be blocked, the pressure difference will increase, and the blast furnace will be affected until it causes suspension. The unburned pulverized coal that has not been utilized then escapes from the furnace roof with the gas and loses the effect of coal injection. Maximize the combustion rate of pulverized coal in the tuyere area and the replacement ratio of coal injection, reduce the coke ratio and fuel ratio, reduce the energy consumption of the bla...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/003C21B5/008
Inventor 余珊珊李勇波彭浩黄平苑兴庭叶纪康
Owner 武汉钢铁有限公司
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