Novel hydrogen-carbon smelting reduction ironmaking process

A new process and reduction furnace technology, applied in the new process of hydrogen-carbon smelting reduction ironmaking, can solve the problems of high energy consumption and reduce energy utilization rate, and achieve the effects of increasing smelting intensity, reducing CO2 production, and reducing pollution

Inactive Publication Date: 2012-07-18
SHANGHAI UNIV
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  • Abstract
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Problems solved by technology

The traditional smelting reduction process (COREX, HISMELT, etc.) uses carbon as the reducing agent and heating agent at the same time, which reduces the energy utilization rate and makes the energy consumption higher.

Method used

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  • Novel hydrogen-carbon smelting reduction ironmaking process
  • Novel hydrogen-carbon smelting reduction ironmaking process
  • Novel hydrogen-carbon smelting reduction ironmaking process

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Embodiment Construction

[0028] The present invention is a new hydrogen-carbon smelting reduction ironmaking process, which has the following processes and steps:

[0029] a. Preheating of raw materials, pre-reduction of iron ore powder; preheating and pre-reduction of raw materials (a) preheating of iron ore powder to 350°C, and then pre-reduction, the reduction temperature is 800°C, to become pre-reduced ore powder; The pre-reduction degree of iron ore powder can be adjusted according to the process requirements; when the pre-reduction degree is 47.5%, the final reduction and secondary combustion rate is 41%; the 800°C pre-reduction iron ore powder is transported to the final stage of the next step by nitrogen through the pipeline. Reduction process (b) for further melting and reduction;

[0030] b. Final reduction smelting; the coal-oxygen combustion lance located in the slag layer, the primary combustion of coal and oxygen and the remaining hydrogen and carbon monoxide undergo secondary combusti...

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Abstract

The invention relates to a novel hydrogen-carbon smelting reduction ironmaking process which comprises the steps of preheating and prereduction of iron ore powder, smelting, slag and iron separation, hydrogen preheating and coal gas reforming. The novel hydrogen-carbon smelting reduction ironmaking process is characterized in that after the iron ore powder is preheated and prereduced, hydrogen and coal are used as reducing agents in the final reduction process and iron ores are subjected to final reduction in a smelting reduction mode; the slag and iron separation of molten liquid iron and molten slags is implemented in a siphon mode; high temperature gas exhausted from a final reduction furnace is subjected to reforming, gas making by coal gas, dust removal and temperature reduction and is subjected to pressure swing adsorption system processing after exchanging heat with the hydrogen; and heat required by the complete process is provided by the oxygen-coal combustion and the secondary combustion of reduction gas. Compared with the existing process, the process has the advantage that the CO2 discharge is reduced by about 10 percent.

Description

technical field [0001] The invention relates to a new hydrogen-carbon smelting reduction ironmaking process, which belongs to the technical field of non-blast furnace ironmaking. Background technique [0002] The traditional blast furnace ironmaking process uses coke as a direct reducing agent, which consumes a lot of heat; the exhaust gas emitted during the coking and sintering process in the blast furnace ironmaking process accounts for a high proportion of the total pollution to the environment. Therefore, a smelting reduction ironmaking process is proposed for the problems of raw materials, waste gas pollution and energy consumption. The traditional smelting reduction process (COREX, HISMELT, etc.) uses carbon as the reducing agent and heating agent at the same time, which reduces the energy utilization rate and makes the energy consumption higher. The smelting reduction process requires the use of more efficient and energy-saving reducing agents. As a clean energy sou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00
Inventor 郑少波孙克强郝学宾魏恒
Owner SHANGHAI UNIV
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