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Coal blending method for controlling and improving coke particle size

A coking coal and coal blending technology, which is applied in the field of coal blending to control and improve the coke particle size, can solve the problems of poor repeatability, many coke shrinkage cracks, and unfavorable lumpiness

Active Publication Date: 2019-12-20
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coke cracks are usually fragmented irregularly, which makes the analysis difficult and the repeatability is not good
[0004] Although high-volatility coal blending will lead to many coke shrinkage cracks and unfavorable coke lumpiness; but how to ensure a relatively high proportion of high-volatility coal blending, through reasonable control of other coal blending and indicators to achieve Improving coke particle size is a major problem faced by domestic coking enterprises

Method used

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  • Coal blending method for controlling and improving coke particle size
  • Coal blending method for controlling and improving coke particle size
  • Coal blending method for controlling and improving coke particle size

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This embodiment discloses the various coal performance indicators and coke-forming microstructures used in the blended coal of this application, as shown in Table 1 and Table 2 respectively;

[0057] Table 1 Performance indicators of various coal types

[0058]

[0059] Table 2 Coke microstructure of various coal types

[0060]

[0061]

Embodiment 2

[0063] The present embodiment discloses 5 kinds of coal blending schemes, and each blending coal ratio in each kind of coal blending scheme is as shown in Table 3;

[0064] Table 3 Coal blending ratio of each scheme

[0065]

[0066] Combining Table 1, Table 2 and Table 3, we can see that the specific index control of each scheme is shown in Table 4

[0067] Table 4 List of control indicators

[0068]

Embodiment 3

[0070] Put the blended coal obtained from the above-mentioned schemes into a 7.63-meter super-large top-loading coke oven for coking. The temperature is 1330°C, and the coking time is controlled for 27 hours. The particle size of the final dry-quenched coke is shown in Table 5, and other performance indicators of the coke are shown in Table 6;

[0071] The coke particle size distribution of each scheme in table 5

[0072]

[0073]

[0074] The coke quality of each scheme of table 6

[0075] plan M40 / ％ M10 / ％ CRI / % CSR / % 1 88.8 5.9 22.2 68.9 2 87.2 6.4 22.3 67.8 3 87.7 6.3 21.2 68.0 4 87.0 6.5 23.8 67.0 5 87.5 6.3 22.2 66.5

[0076] From the above lists it can be seen that:

[0077] Scheme 1: The quality and control indicators of each coal type meet the control requirements. The average particle size of coke is 54.8mm, and the weight distribution accounts for 72% when the particle size is 40-80mm, and the weight...

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Abstract

Belonging to the technical field of blast furnace coking, the invention discloses a coal blending method for controlling and improving coke particle size. The method involves the following coal varieties by mass percentage: greater than or equal to 30-35% of high-volatility coal, less than or equal to 20% of 1 / 3 coking coal 2#, more than or equal to 20% of coking coal 1#, less than or equal to 30%of coking coal 2# and 10-18% of lean coal. Specifically, the high-volatility coal comprises gas coal, fat coal and 1 / 3 coking coal 1#, volatile component Vdaf blended coal of the blended coal prepared from the various coal is less than 28%, the fineness of the blended coal is 70-80%, and the caking index Gblended coal is 80-83. The coal blending method provided by the invention can realize effective control of coke particle size on the basis of realizing high-volatile coking coal consumption up to 30% or above, wherein the average coke particle size is 50-55mm, the 40-80mm particle size fraction accounts for greater than or equal to 65%, and the particle size fraction of less than or equal to 25mm accounts for less than 5%, thus meeting the production requirements of large blast furnaceof 3000m<3> or above.

Description

technical field [0001] The invention relates to a coal blending method, which belongs to the technical field of blast furnace coking, in particular to a coal blending method for controlling and improving coke particle size. Background technique [0002] Coke mainly plays the role of heat generation, reduction, and support of the material column skeleton in the blast furnace. Judging from the current production practice, the role of coke as the skeleton of the material column is particularly important, which determines the air permeability of the blast furnace. In order to provide a good air permeability for the blast furnace, the most important thing is that the particle size of the coke should be uniform to ensure the gaps in the material layer, reduce the pressure drop of the updraft, and finally achieve the stability of the blast furnace. Research by experts shows that whether it is to increase the smelting intensity or increase the coal ratio, the limiting factor is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B57/04
CPCC10B57/04
Inventor 项茹刘睿宋子逵周森林
Owner 武汉钢铁有限公司