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

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...

AI Technical Summary

Problems solved by technology

[0002] In order to solve the problems of large-scale 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.

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