A method for distributed utilization of heat in the process of producing direct reduced iron in a CDQ coupling shaft furnace

A CDQ coke oven and reduced iron technology, which is applied to the improvement of process efficiency, shaft furnaces, furnaces, etc., can solve the problems of underutilization of the reducing function of reducing gas, incorrect energy utilization, and unreasonable energy utilization, etc., to achieve improved Energy utilization efficiency, the effect of improving energy utilization efficiency and reducing heat consumption

Active Publication Date: 2022-05-24
太原理工大学建筑设计研究院有限公司
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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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  • A method for distributed utilization of heat in the process of producing direct reduced iron in a CDQ coupling shaft furnace
  • A method for distributed utilization of heat in the process of producing direct reduced iron in a CDQ coupling shaft furnace

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[0031] like figure 1 As shown, red coke with a temperature of about 1050°C enters CDQ oven 1, nitrogen absorbs sensible heat of red coke from bottom to top in CDQ oven 1, red coke emits heat and then discharges coke from the lower part of CDQ oven 1, After the nitrogen absorbs heat, it becomes high-temperature nitrogen, and the high-temperature nitrogen is sent to the high-temperature heat exchanger 3 through the high-temperature dust collector 2 for heat exchange with the gas from the decarburization device 4 and the purified gasification gas, and the high-temperature nitrogen becomes a temperature not greater than The circulating nitrogen at 180°C is returned to the CDQ 1 for recycling. The gas from the decarburization unit 4 is mixed with the clean gasification gas, and a part of the cold reduction gas passes through the low temperature heat exchanger 6 to recover the sensible heat of the top gas. It becomes a low temperature reducing gas of 100~300℃, and the remaining cold...

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Abstract

The invention relates to the technical field of chemical industry and metallurgy, in particular to a method for distributed utilization of heat in the process of producing direct reduced iron in a coke dry quenching coupling shaft furnace. In the method of the present invention, the heat of the system is provided by red coke sensible heat recovered from dry coke quenching, chemical heat of non-catalytic conversion reaction of methane-containing gas, and top gas generated by the shaft furnace, so that all the top gas can be used as the system reducing agent, and the reduction due to reduction can be reduced. The gas consumption increases and the use value decreases due to the combustion of inert gas for heating. At the same time, adjusting the carbon-hydrogen ratio and temperature of the furnace gas by supplementing the system reducing gas and adding the reformed gas obtained by non-catalytic conversion of methane gas is beneficial to control the reaction temperature in the shaft furnace, reduce the thermal knot of the charge, and keep the reduction reaction in the shaft furnace stable. conduct.

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 a process for producing direct reduced iron with a dry quenching and coupling shaft furnace. Background technique [0002] Direct Reduced Iron (DRI) is a high-quality raw material for EAF smelting high-end steel products and an indispensable diluent for residual elements in the scrap utilization process. Direct reduction technology is one of the cutting-edge technologies for the sustainable development of the iron and steel industry, the realization of energy saving, emission reduction, and environment-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 in the steel industry will continue to increase. [0003] At present, in terms of direct reduction technology, the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/02C21B5/06
CPCC21B13/02C21B13/0073C21B5/06Y02P10/25Y02P10/143
Inventor 石玉良梁言杨力薛钟安申峻王斌张永发周晋华马艳华
Owner 太原理工大学建筑设计研究院有限公司
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