Method for determining blending amount of ashless coal and method for producing blast furnace coke

An ash-free coal and blending technology, applied in coke ovens, petroleum industry and other directions, can solve the problems of adhesion obstruction and low strength, and achieve the effect of reliable manufacturing, reducing manufacturing cost and easy manufacturing.

Active Publication Date: 2019-06-14
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, like Figure 1A In this way, if the proportion of non-slightly caking coal is high, the cohesion between the strongly caking coal particles 1 is hindered, and low-strength coke with coarse defects B inside is formed.

Method used

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  • Method for determining blending amount of ashless coal and method for producing blast furnace coke
  • Method for determining blending amount of ashless coal and method for producing blast furnace coke
  • Method for determining blending amount of ashless coal and method for producing blast furnace coke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0063] Using the ash-free coal X among the ash-free coals produced as described above, cokes for blast furnaces of Examples 1 to 5 were produced in the following procedure.

[0064] (blending process)

[0065] As the raw coal, various raw coals A to E having the characteristics shown in Table 2 were adjusted to a water content of 7.5% by mass, and mixed according to the blending ratio condition 1 shown in Table 2 on a dry coal basis. At this time, as the raw coal, the whole (100% by mass) of the raw coal was pulverized to a maximum diameter of 3 mm or less. In addition, the maximum fluidity MF [dppm] of raw coal and ash-free coal shown in Table 2 was measured by the Gieseler plastometer method in accordance with JIS-M8801:2004. In addition, the average maximum reflectance Ro [%] is measured in accordance with JIS-M8816:1992, and the expansion ratio [volume %] is measured in accordance with JIS-M8801:2004.

[0066] Make the packing bulk density of the raw coal be 740kg / m 3 T...

Embodiment 6～8

[0070] The ash-free coal used is the ash-free coal Y in Table 1. In addition, the same steps as in Examples 1 to 5 are used to blend the raw coal and the ash-free coal Y in the blending amount shown in Table 3. Coal was dry-distilled to obtain cokes for blast furnaces in Examples 6-8. The standard value W of the above raw material coal with respect to the ashless coal Y is 17.5% by mass.

Embodiment 9、10

[0072] The ash-free coal used is the ash-free coal Z in Table 1. Except for this, the same steps as in Examples 1 to 5 were used to blend raw coal and ash-free coal Z in the blending amount shown in Table 3. The mixed coal was subjected to dry distillation to obtain coke for blast furnaces in Examples 9 and 10. The reference value W of the raw material coal to the ash-free coal Z is 32.9% by mass.

[0073]

[0074] As the raw coal, various raw coals A to E with the characteristics shown in Table 2 were adjusted to have a water content of 7.5% by mass, and mixed according to the blending ratio condition 2 shown in Table 2 on a dry coal standard to prepare the raw coal . In this case, as the raw coal, the whole (100% by mass) of the raw coal was pulverized to a maximum diameter of 3 mm or less. Next, without mixing ash-free coal, the raw coal was dry-distilled under the same conditions as in Examples 1 to 5 to obtain coke for a blast furnace in Comparative Example 1.

[007...

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Abstract

The purpose of the present invention is to provide: an efficient method for deciding the blending amount of ash-free coal when producing a coke for blast furnaces; and a process for producing a coke for blast furnaces using said decision method. This method is for deciding the blending amount of ash-free coal obtained by solvent extraction of coal, when producing a coke for blast furnaces which comprises feed coal and the ash-free coal. The method comprises: calculating a reference value W [mass%] from the porosity index Pv [vol%] of the feed coal, the expansibility index D [vol%] of the ash-free coal, and the true specific gravity ρ of the ash-free coal using the following equation (1); and deciding the blending amount of the ash-free coal with respect to the blend coal on the basis of the reference value W. The blending amount of the ash-free coal with respect to the blend coal is preferably 0.29W-1.00W [mass%]. W=(Pv / D)×ρ×100 (1)

Description

technical field [0001] The present invention relates to a method for determining the blending amount of ash-free coal and a method for producing coke for blast furnaces. Background technique [0002] Coke used in blast furnace ironmaking is expected to have the following three functions: function as a reducing material for iron ore (iron oxide); function as a heat source (fuel); and resistance to coke itself and iron ore load and functions as a filler for ensuring air permeability in the furnace. In order to perform these functions, certain strength and reactivity (reducibility and combustibility) are required for the above-mentioned coke. [0003] Generally, coke is produced by roasting coal at a high temperature of 1000° C. or higher (hereinafter referred to as “carbonization”). To obtain high-strength coke, so-called strongly caking coal with high caking properties is used, but such strongly caking coal is relatively expensive. Therefore, in order to reduce the product...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B57/04
CPCC10B57/04
Inventor 滨口真基和田祥平西端裕子石田一秀宍户贵洋
Owner KOBE STEEL LTD
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