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Smelting reduction furnace coal-injection process

A technology of reduction furnace and coal injection, which is applied in the field of metallurgy, can solve the problems of high cost of molten iron, complex process of coal supply system, high investment of coal briquetting system, and achieve the effect of reducing production cost and system investment

Inactive Publication Date: 2006-10-04
CISDI ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The coal supply system has complex process, high investment in coal briquetting system, and high cost of molten iron

Method used

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  • Smelting reduction furnace coal-injection process

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing, two embodiments of the present utility model are further described:

[0019] The coal from the raw material field is sifted through wet coal first, and the particle size of the sieved pulverized coal is 8-10mm. The pulverized coal is sent to the coal dryer 21 through the feeding belt 23, and the dried coal is sent to the screening by the dry coal belt 22. Building 17 is screened by double-layer sieves, wherein the coal with a diameter of more than 6mm is sent to the coal bin 18 by the coal conveyor belt 16, and the fine coal with a diameter of 3-6mm is sent to the coal bin 18 by the coal conveyor belt 24. Coal from silo 14, daily coal silo 18 and pulverized coal daily silo 14 is fed from the top of melting gasifier 2 through coal feeding belt 15, coal bunker 3 and spiral coal feeder 4; pulverized coal with raw coal diameter ≤ 3mm enters The pulverized coal storage bin 27 of the granular coal injection system, the coal in t...

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Abstract

The blowing coal dust method for fusing reduction in iron making comprises: wetting the raw coal to sieve: sending the coal with size more than 20mm to coal daily bunker in mine slot, and other to cool drying system; drying coal till water content reducing from 10% to less than 5%; sieving with dual-layer sieve to send the coal with size more than 6mm to daily bunker, 3-6mm coal to fine coal bunker and other to direct blow. This invention reduces investment and cost.

Description

technical field [0001] The invention belongs to metallurgy, in particular to the pulverized coal injection process in the smelting reduction ironmaking method. Background technique [0002] The COREX ironmaking method is a smelting reduction ironmaking method that has been put into industrial scale production. The development of this process began in the late 1970s. After a small-scale test was jointly carried out by the German KORF Engineering Company and VAI, in 1981 a half-scale semi-metal furnace with an annual output of 60,000 tons of molten iron was built in KEHL / RHINE, Germany. Industrial test device (ie KR method), using the device to carry out 10 times a total of 6000 hours of semi-industrial tests. By 1987, a total of 18 kinds of coal and 14 kinds of lump ore, pellets and sintered ore from all over the world were tested, proving the feasibility of this process. In 1985, the South African Iron and Steel Corporation (ISCOR) adopted this technology, and built the wo...

Claims

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Application Information

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IPC IPC(8): C21B13/00C22B5/10
Inventor 张涛彭华国唐小葳胡显波吕遐平
Owner CISDI ENG CO LTD