Coal fine preparation, blowing method and device from packed-bed smelting reduction furnace

A coal powder preparation and reduction furnace technology, which is applied in the field of smelting reduction ironmaking, can solve the problems of large investment scale and large pollution, and achieve the effects of reducing coal cost, reducing production cost, and huge economic and social benefits

Active Publication Date: 2009-04-01
BAOSTEEL ENG & TECH GRP +1
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Problems solved by technology

[0002] In order to solve the problems of large-scale investment and heavy pollution in the traditional blast furnace ironmaking metho

Method used

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  • Coal fine preparation, blowing method and device from packed-bed smelting reduction furnace

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Embodiment Construction

[0053] The embodiments are described below in conjunction with the accompanying drawings.

[0054] Referring to Figure 1, the raw coal suitable for COREX melting gasifier to produce reducing gas is crushed, screened and transported, and the crushed coal with a particle size below 5mm is loaded into the raw coal bunker 1 and supplied to the coal mill through the quantitative coal feeder 2 Coal mill 3 and coal mill 3 are fed with dry mixed gas for drying coal powder; coal powder is sucked into bag-type powder collector 7 by draft negative pressure after being dried and ground in coal mill 3, and in the bag-type powder collector 7 for gas-powder separation, and the filtered gas is sucked away from the top of the bag-type powder collector 7 by the exhaust fan 6 and discharged into the atmosphere through the chimney. collar storage.

[0055] The dry mixed gas fed into the coal mill is formed by mixing the high-temperature dry gas produced by the dry gas heating furnace 4 and the t...

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Abstract

The invention discloses a filling bed COREX stove braise preparing and blowing method which comprises the following steps of: a) putting mine run coal which is applicable to melting in the COREX stove and producing reducing gas into a run coal bin by crushing and screening the mine run coal into crushed coal; b) milling the crushed coal to minus 200 meshes and above 60 percent by a coal-milling device provided by a coal feeder and carrying out drying at the same time; and c) putting the finished braise into a pulverized coal bunker after the separation of gas and powder; loading the braise into 2 or 3 coal injecting tanks sequentially; transporting the braise to a distributor mechanism positioned at the top of a melting gasification furnace of the COREX stove by using pressured gas after the processes of pressurizing fluidization and gas supplement; distributing the braise to the blowing branch pipe which is led to the oxygen tuyere of the melting gasification furnace; spraying the braise into the melting gasification furnace by a coal injection gun. The method has the advantages that the in-place digestion and utilization of powder sifted range coal of the filling bed COREX stove is realized; and the total coal consumption of the COREX stove can be reduced by replacing part range coal; therefore, the cost of production is reduced; more optimized COREX melting reduction process and more flexible operation are realized.

Description

technical field [0001] The invention relates to smelting reduction ironmaking technology, in particular to a method and device for preparing and injecting pulverized coal in packed bed smelting reduction furnaces such as COREX. Background technique [0002] In order to solve the problems of large investment and heavy pollution in the traditional blast furnace ironmaking method, since the 1970s, a COREX furnace ironmaking method, namely the smelting reduction ironmaking method, has been developed in the world. The ironmaking method directly uses ordinary lump coal of a certain size and is pretreated to be put into the furnace to generate heat for smelting molten iron and reducing gas. In order to make full use of the resource of fine coal produced during coal transportation, technicians in this ironmaking method are working hard to find a stable and reliable process equipment for the preparation and injection of pulverized coal in the COREX melting gasifier, so as to facilita...

Claims

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Application Information

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IPC IPC(8): C21B13/00C22B5/10C10L5/00
Inventor 黄春进徐万仁陈玉明施国华杜海钢温大威李维国张青田广亚林金嘉周渝生王东彦郭丽
Owner BAOSTEEL ENG & TECH GRP
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