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Large-ratio lean coal coking method

A technology of lean coal and blended coal, applied in the field of coking, coking, tamping and coking, can solve the problems of consumption of coke pushing current, volatile matter, low cohesion index, small shrinkage of coke cake, etc., to solve the shortage of coal resources and achieve economic benefits. The effect of significantly reducing the cost of coal blending

Active Publication Date: 2013-02-13
YUNNAN COAL & ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The so-called lean coal, due to the high degree of coalification, low volatile matter and caking index of coal, after coking alone or with a large proportion of coking at 1000±50°C, the cold strength of the coke obtained (M40: 70-75% , M10: 10~14%), thermal strength (CRI: 37~39%, CSR: 45~50%) are too low to meet the demand for coke used in steel production, and because of the small shrinkage of the coke cake, the coke pushing resistance It needs to consume more than 400 amperes of coke pushing current, and there are many problems such as difficult coke pushing safety hazards, energy consumption, low efficiency, and unstable production in coke ovens.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A. Prepare materials according to the following proportions:

[0020] 50 wt% high coalification lean coal with Rmax of 1.7%

[0021] Low coalification coal with Rmax of 0.8% 10 wt%

[0022] Medium coalification coal with Rmax of 1.2% 15 wt%

[0023] 25 wt% medium coalification coal with Rmax of 1.4%;

[0024] B, after the lean coal of step A is crushed until the particle size is less than 3mm and accounts for more than 95%, it is uniformly mixed with all the other raw coals to obtain: Rmax is 1.35%, volatile content is 25.0 wt%, ash content is 14.5 wt%, caking Coal blend with an index of 70, a final shrinkage of 35mm, and a maximum expansion of the colloidal layer of 14.0:

[0025] C. Send the mixed coal of step B to a conventional 5.5-meter tamping coke oven. Under the condition that the central temperature is 970°C, the pressure of the fire hole is 5pa, the pressure of the air collecting pipe is 100pa, and the suction of the branch flue is 245pa, coking f...

Embodiment 2

[0027] A. Prepare materials according to the following proportions:

[0028] Rmax is 1.6% high coalification lean coal 55 wt%

[0029] Low coalification coal with Rmax of 0.8% 10 wt%

[0030] Medium coalification coal with Rmax of 1.1% 25 wt%

[0031] Rmax is 1.5% medium coalification coal 10 wt%;

[0032] B. After the lean coal in step A is crushed until more than 95% of the particle size is less than 3mm, it is uniformly mixed with the remaining raw coals to obtain: Rmax is 1.36%, volatile matter is 23.0 wt%, ash is 15wt%, caking index 65, the final shrinkage is 34mm, and the maximum expansion of the colloidal layer is 13.8mm:

[0033] C. Send the mixed coal of step B to a conventional 5.5-meter tamping coke oven. Under the condition that the central temperature is 985°C, the pressure of the fire hole is 7pa, the pressure of the air collecting pipe is 115pa, and the suction of the branch flue is 240pa, coking for 28 hours, the cold state strength M40 is 83%, M10...

Embodiment 3

[0035] A. Prepare materials according to the following proportions:

[0036] 60 wt% high coalification lean coal with Rmax of 1.5%

[0037] Low coalification coal with Rmax of 0.9% 15 wt%

[0038] Medium coalification coal with Rmax of 0.9% 10 wt%

[0039] Rmax is 1.2% medium coalification degree coal 15 wt%;

[0040] B. After the lean coal in step A is crushed until more than 95% of the particle size is less than 3mm, it is uniformly mixed with the remaining raw coal to obtain: Rmax is 1.45%, volatile content is 22.0 wt%, ash content is 14 wt%, caking index 65, the final shrinkage is 30mm, and the maximum expansion of the colloidal layer is 13.5mm:

[0041] C. Send the mixed coal of step B to a conventional 5.5-meter tamping coke oven. Under the condition that the central temperature is 1000°C, the pressure of the fire hole is 10pa, the pressure of the air collecting pipe is 120pa, and the suction of the branch flue is 235pa, coking for 27 hours, the cold state s...

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Abstract

The invention provides a large-ratio lean coal coking method which comprises the following steps: uniformly mixing the following coal: 50-60wt% of coal of which Rmax is 1.5-1.7%, 10-15wt% of coal of which Rmax is 0.6-0.9%, 15-25wt% of coal of which Rmax is 0.9-1.2% and 10-25wt% of coal of which Rmax is 1.2-1.5%; transferring into a stamp-charging coke oven; and under the conditions that the machine side temperature is 1315-1325 DEG C, the coke side temperature is 1325-1335 DEG C, the coke cake center temperature is 970-1000 DEG C, the observation hole pressure is 5-10 pa, the gas collecting tube pressure is 100-120 pa and the branch gas flue suction force is 235-245 pa, coking for 25-28 hours to obtain coke meeting the requirements of blast furnace ironmaking. Thus, the invention effectively solves the problems that the coke quality is poor due to lean coal large-ratio coking and coke in the coke oven is difficult to push in the coking process, reduces the coke pushing current by 50 Amperes, effectively lowers the coal blending cost and solves the problem on shortage of coal resources.

Description

technical field [0001] The invention relates to a coking method, in particular to a coking method with a large ratio of lean coal, and belongs to the technical field of coking, stamping and coking. Background technique [0002] In iron and steel smelting, the three major raw materials of iron ore, limestone, and coke are indispensable. With the depletion of existing resources, how to make full use of existing resources while looking for new resources has become a major issue for major iron and steel companies. The primary problem that enterprises must solve. For coke production enterprises, they also face the following problems: how to develop coking technology solutions suitable for local coal resources according to the current situation of local coal resources, and smelt qualified coke. [0003] The so-called lean coal, due to the high degree of coalification, low volatile matter and caking index of coal, after coking alone or with a large proportion of coking at 1000±50°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B57/04
Inventor 龙建新张明龙菊兴陈朝辉陈四利
Owner YUNNAN COAL & ENERGY
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