Method for distributively utilizing heat in process of producing direct reduction iron by dry quenching coupling shaft furnace

Abstract

The invention relates to the technical field of chemical metallurgy, particularly to a method for distributively utilizing heat in a process of producing direct reduction iron by a dry quenching coupling shaft furnace. System heat in the method of the invention is provided by dry quenching recovery red coke sensible heat, methane-contained non-catalytic conversion reaction chemical heat, and stockgas generated by a vertical shaft, and all the stock gas is used as a system reducing agent, so that the increment of gas consumption and the reduction of use value caused by combustion heat supply of reduction gas are reduced. Moreover, the carbon-hydrogen ratio and temperature of burner gas are adjusted by supplementing system reduction gas and adding converted gas obtained by methane-containednon-catalytic conversion, so that the control of a reaction temperature in the shaft furnace is facilitated, the thermal agglomeration of burdens is reduced, and smooth implementation of a reductionreaction in the shaft furnace is guaranteed.

Description

technical field [0001] The invention relates to the technical field of chemical metallurgy, in particular to a method for distributed utilization of heat in the process of dry coke quenching coupled with a shaft furnace to produce direct reduced iron. Background technique [0002] Direct reduced iron (DRI) is a high-quality raw material for electric furnace smelting of high-end steel products and an indispensable diluent for residual elements in the process of scrap steel utilization. Direct reduction technology is one of the cutting-edge technologies for the sustainable development of the iron and steel industry, energy saving, emission reduction, and environmentally friendly development. With the structural adjustment of my country's steel industry and the increase in the proportion of pure steel and high-quality steel, the demand for DRI as a high-quality raw material for the steel industry will continue to increase. [0003] At present, in terms of direct reduction tech...

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Problems solved by technology

[0010] In order to solve the technical problems in the existing shaft furnace direct reduction ironmaking process that the energy utilization is incorrect and the reduction function of the reducing gas is not fully utilized, resulting in low energy utilization efficiency and unreasonable energy utilization of the system, the purpose of the present invention is to provide a A method for distributed utilization of heat in the process of producing direct reduced iron in a CDQ coupling shaft furnace, the specific technical scheme is as follows

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