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Method for improving yield of high strength coke produced by blending low rank coal

A technology of coke yield and low-rank coal, which is applied in the field of coking coal blending, can solve the problems of low yield of high-strength non-metallurgical coke, lower furnace roof, yield of unqualified coke, etc., achieve simple process and improve mechanical strength Effect

Active Publication Date: 2018-11-06
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can reduce the yield of unqualified coke on the top of the furnace, and solve the problem of using a large proportion of low-rank coal (lignite, long-flame coal, non-caking coal, etc.) in the coke oven to produce high-strength non-metallurgical coke (gasification coke, clean coke) etc.) The technical problem of low yield can increase the yield of high-strength coke by 5-10% compared with conventional coking methods

Method used

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  • Method for improving yield of high strength coke produced by blending low rank coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: The gel layer thicknesses of Shenmu long-flame coal (SMC), Shenmu gas coal (QM-2), and Wuhai fat coal (FM-2) used in this example are 0, 12, and 33, respectively.

[0018] Two filling methods are adopted: one is the conventional filling method, that is, SMC and QM-2 are respectively crushed to a particle size of <3 mm (accounting for 87%), and FM-2 is crushed to a particle size of <1 mm (accounting for 95%), calculated by weight percentage , SMC, QM-2 and FM-2 are added in amounts of 30%, 45% and 25% respectively, and after mixing, tamping and coking are carried out.

[0019] The layered (two-layer) filling method of the present invention,

[0020] (1) Crush FM-2 to a particle size of <1 mm (accounting for 95%) and store it separately;

[0021] (2) Crush SMC and QM-2 to a particle size of <3 mm (accounting for 87%), and then sieve them with a standard vibrating sieve, and sieve through a sieve hole of 1 mm to ensure that the fine particles of the sieve are p...

Embodiment 2

[0023] Example 2: The colloidal layer thicknesses of Xiaolongtan lignite (XLT), Wuhai gas coal (QM-1) and Taiyuan fat coal (FM-1) used in this example are 0, 11, and 32, respectively.

[0024] Two filling methods are adopted: one is the conventional filling method, that is, XLT and QM-1 are respectively crushed to a particle size of <3 mm (accounting for 85%), and FM-1 is crushed to a particle size of <0.6 mm (accounting for 93%), calculated by weight percentage , XLT, QM-1 and FM-1 are added in amounts of 40%, 35%, and 25% respectively, and they are mixed for tamping and coking.

[0025] The layered (two-layer) filling method of the present invention,

[0026] (1) Crush FM-1 to a particle size of <0.6 mm (accounting for 93%) and store it separately;

[0027] (2) Grind XLT and QM-1 to a particle size of <3 mm (accounting for 85%), and then sieve them with a standard vibrating sieve, and sieve through a sieve hole of 1 mm to ensure that the fine particles of the undersieve are...

Embodiment 3

[0029] Example 3: The gel layer thicknesses of Shenmu long-flame coal (SMC), Shenmu gas coal (QM-2), and Wuhai fat coal (FM-2) used in this example are 0, 12, and 33, respectively.

[0030] Two filling methods are adopted: one is the conventional filling method, that is, SMC and QM-2 are crushed to a particle size of <3 mm (accounting for 86%), and FM-2 is crushed to a particle size of <0.3 mm (accounting for 92%), calculated by weight percentage , SMC, QM-2 and FM-2 are added in amounts of 40%, 40% and 20% respectively, and after mixing, tamping and coking are carried out.

[0031] The layered (two-layer) filling method of the present invention,

[0032] (1) Crush FM-2 to a particle size of <0.3 mm (accounting for 92%) and store it separately;

[0033] (2) Crush SMC and QM-2 to a particle size of <3 mm (86%), and then sieve them with a standard vibrating sieve, and sieve through a sieve hole of 1.5 mm to ensure that the fine particles of the sieve are pressed The percentage...

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Abstract

The invention discloses a method for improving the yield of high strength coke produced by blending low rank coal. The yield of the high strength coke produced by blending the low rank coal is realized by optimizing particle size distribution of different blended coal and a filling mode in a coke oven. According to the method, the low rank coal and weakly caking coal are divided into two grades offine particles and coarse particles by screening; then the low rank coal and the weakly caking coal are respectively mixed with strong caking coal fine powder (the particle size is smaller than 0.2 to 1 mm); a mixture is filled in the coke oven at upper and lower layers, so that the average granularity of the upper-layer blended coal of the coke oven is greater than the lower granularity; by means of the filling mode, the upper coke strength in the coke oven is consistent with the lower coke strength, so that the yield of coke with mechanical strength M25 greater than 85 to 90 percent is improved by 5 to 10 percent than that of a conventional filling method (the particle sizes of the low rank coal and the weakly caking coal are un-graded).

Description

technical field [0001] The invention belongs to the technical field of coking coal blending, and in particular relates to a method capable of improving the yield of high-strength coke produced by blending low-rank coal. Background technique [0002] In the practice of tamping coking production, the coal particle size is controlled to be less than 3 mm for furnace coking. Due to the change in the bulk density of the coal seam itself, the mechanical strength of the coke near the top of the furnace is far from meeting the mechanical strength requirements of high-quality coke. A weaker coke is inevitably produced. In general tamping coking production, although the yield of coke lumps is greater than 95% after the coke is sieved, there will be a loss of 7-8% during transportation. In addition, it will be further sieved before the metallurgical blast furnace is used. , and there is another 2-3% loss, so before the blast furnace is actually used, its high-strength coke rate is onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B57/00C10B57/04C10B31/10C10L5/00C10L5/04
CPCC10B31/10C10B57/00C10B57/04C10L5/00C10L5/04C10L2290/24C10L2290/28
Inventor 黄戒介杨志荣王志青房倚天
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI