Gas-based reduction method and system for granular iron ore and application

An iron ore and granular technology, applied in chemical instruments and methods, waste gas treatment, climate sustainability, etc., can solve problems such as long residence time of reducing gas, affecting fluidization, and unstable operation of the device

Pending Publication Date: 2021-09-10
北京金博威科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluidized bed technology with iron powder as the product is not stable due to the long residence time of the reducing gas, low utilization efficiency of the reducing gas, low metallization rate of the product, and the mutual bonding between the iron particles at high temperature affects the fluidization, etc. Due to poor economic benefits and other reasons, only a very small number of factories are still in operation

Method used

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  • Gas-based reduction method and system for granular iron ore and application
  • Gas-based reduction method and system for granular iron ore and application
  • Gas-based reduction method and system for granular iron ore and application

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Embodiment approach

[0097] As a preferred embodiment of the present invention, at least part of the purified tail gas is mixed with the shift gas after the first dehydration treatment for reuse; or, at least part of the purified tail gas is mixed with the first deCO2 2 The treated hydrogen-rich gas is blended for reuse.

[0098] As a preferred embodiment of the present invention, the purified tail gas is mixed with fuel gas and oxygen-containing gas and used as fuel, and the heat generated by combustion can be used to preheat granular iron ore.

[0099] The gas-based reduction method of granular iron ore provided by the present invention can not only realize the preparation of granular direct reduced iron with a higher metallization rate, but also realize the efficient utilization of reducing gas, greatly reduce energy consumption in the process, heat and material It is also fully recycled and has a good application prospect in the field of industrial preparation of granular direct reduced iron. ...

Embodiment 1

[0142] The present embodiment provides a gas-based reduction method of granular iron ore, comprising the following steps:

[0143] (a) Desulfurize the gasified liquefied natural gas with a pressure of 2.8MPa and mix it with water vapor at a volume ratio of (3.5-3.6): 1 to carry out a reforming reaction. The temperature of the reforming reaction is 870°C to obtain Crude synthesis gas; wherein, the mass fraction of sulfur in the natural gas after desulfurization is less than 1ppm; the dry gas composition in the crude synthesis gas includes: H 2 68-70%, CO 12-13%, CO 2 16-18% and CH 4 1-1.5%;

[0144] The crude synthesis gas is subjected to a shift reaction, and the temperature of the shift reaction is 360-380° C. to obtain the shift gas;

[0145] The shift gas is subjected to the first dehydration treatment and the first deCO 2 Process to obtain hydrogen-rich gas; wherein, the dry gas composition of hydrogen-rich gas includes: H 2 93-96%, CO 3-5%, CO 2 0-0.2%, CH 4 1.2-1....

Embodiment 2

[0153] The present embodiment provides a gas-based reduction method of granular iron ore, comprising the following steps:

[0154] (a) Desulfurize compressed natural gas with a pressure of 2 MPa and mix it with water vapor at a volume ratio of (3.2-3.3): 1 to carry out a reforming reaction. The temperature of the reforming reaction is 850° C. to obtain crude synthesis gas; wherein , the mass fraction of sulfur in natural gas after desulfurization is less than 1ppm; the composition of dry gas in crude synthesis gas includes: H 2 63-65%, CO 15-16%, CO 2 13-15% and CH 4 3-3.5%, N 2 2-3%;

[0155] The crude synthesis gas is subjected to a shift reaction, and the temperature of the shift reaction is 230-250° C. to obtain the shift gas;

[0156] The shift gas is subjected to the first dehydration treatment and the first deCO 2 Process to obtain hydrogen-rich gas; wherein, the dry gas composition of hydrogen-rich gas includes: H 2 92-94%, CO 0.3-0.5%, CO 2 0-0.1%, CH 4 3.5-4....

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Abstract

The invention provides a gas-based reduction method and system for granular iron ore and application, and relates to the technical field of smelting. According to the gas-based reduction method, pure oxygen and high-calorific-value fuel gas are not needed, natural gas is used as a raw material, compressed natural gas is converted into hydrogen-rich gas through desulfurization, steam reforming, shift reaction, first dehydration treatment and first CO2 removal treatment, the hydrogen-rich gas is preheated to be in countercurrent contact with the granular iron ore with a specific particle size and a specific preheating temperature to conduct a reduction reaction so as to prepare the granular directly reduced iron; and due to the fact that the particle size of the granular iron ore is small, the reduction reaction speed at the same temperature is higher than that of traditional pellets, other binders and sintering processes do not need to be introduced, pollution is greatly reduced, meanwhile, the granular iron ore at the specific preheating temperature and the hydrogen-rich gas are directly subjected to the reduction reaction, and the reduction reaction at low temperature is realized by utilizing the heat of the granular iron ore and the hydrogen-rich gas.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a gas-based reduction method, gas-based reduction system and application of granular iron ore. Background technique [0002] At present, there are many ironmaking technologies in the global iron and steel smelting industry, including blast furnace ironmaking technology and non-blast furnace ironmaking technology. Non-blast furnace ironmaking technology is divided into direct reduction and smelting reduction, and direct reduction is divided into gas-based reduction and coal-based reduction. . Among them, blast furnace ironmaking technology has the largest production scale and usage. In the blast furnace ironmaking process, a large amount of dust, carbon dioxide and other gases will be emitted during the coking and sintering process, which brings great pressure to the environment. In non-blast furnace ironmaking technology, the gas-based reduction process uses reducing gas to red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C21B13/08C01B3/34C01B3/12
CPCC21B13/0073C21B13/0033C21B13/08C01B3/34C01B3/12C21B2100/40C21B2100/62C01B2203/0205Y02P10/122Y02P10/143
Inventor 魏小波靳辉
Owner 北京金博威科技有限公司
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