Low-energy-consumption and low-emission sintering method for multi-component gas medium composite injection

A gas medium and sintering method technology, applied in the direction of reducing gas emissions, can solve the problems of not being able to reduce the emission of multiple pollutants at the same time, the degree of emission reduction is limited, and the ability to reduce fossil fuel consumption is limited, achieving obvious economic advantages. Improved yield and low cost

Active Publication Date: 2021-07-13
CENT SOUTH UNIV
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Problems solved by technology

[0004] Aiming at the defects that the existing single-medium injection technology cannot achieve simultaneous emission reduction of multiple pollutants, and the degree of emission reduction is limited, and the ability to reduce fossil fuel consumption is limited. The purpose of the present invention is to provide a method that can Meet the heat demand at different heights of the material layer, synergistically improve fuel combustion efficiency, further reduce solid fossil fuel consumption, and make CO 2 Greenhouse gas and CO, NO X , SO X Low energy consumption and low emission sintering method of multi-component gas medium compound injection with effective emission reduction of various pollutants such as dioxin and dioxin

Method used

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  • Low-energy-consumption and low-emission sintering method for multi-component gas medium composite injection

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Embodiment -1

[0035] According to the mass ratio of 59.77% mixed iron ore, 4.27% dolomite, 5.57% limestone, 3.46% quicklime, 13.85% sintered ore return, 9.23% blast furnace return ore, and 3.85% coke powder (the chemical composition of the obtained sintered ore is TFe56. 08%, R1.80, MgO1.80%, CaO10.76%), after the materials are mixed and granulated, they are placed on the sintering surface, ignited for 1min at a temperature of 1050±50°C, held for 1min, and then heated under negative pressure Sintering is carried out under the condition of 15kPa. The sintering process is divided into three gas medium injection areas from the end of ignition to the beginning of exhaust gas temperature rise (see Figure-1 for the schematic diagram): Area-1 accounts for 40% of the entire interval, and the total concentration of the injected medium is 0.8% (70 % coke oven gas, 20% water vapor (temperature 200°C, pressure 1.57MPa), 10% oxygen); area-2 accounts for 40% of the entire interval, and the total concentr...

Embodiment -2

[0037] According to the mass ratio of 59.77% mixed iron ore, 4.27% dolomite, 5.57% limestone, 3.46% quicklime, 13.85% sintered ore return, 9.23% blast furnace return ore, and 3.85% coke powder (the chemical composition of the obtained sintered ore is TFe56. 08%, R1.80, MgO1.80%, CaO10.76%), after the materials are mixed and granulated, they are placed on the sintering surface, ignited for 1min at a temperature of 1050±50°C, held for 1min, and then heated under negative pressure Sintering is carried out under the condition of 15kPa. The sintering process is divided into three gas medium injection areas from the end of ignition to the beginning of exhaust gas temperature rise (see Figure-1 for the schematic diagram): Area-1 accounts for 50% of the entire interval, and the total concentration of injected medium is 1.0% (75 % converter gas, 10% water vapor (temperature 200°C, pressure 1.57MPa), 15% oxygen); zone-2 accounts for 40% of the entire interval, and the total concentratio...

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Abstract

The invention discloses a low-energy-consumption and low-emission sintering method for multi-component gas medium composite injection. The method comprises the following steps: sequentially dividing a region, from an ignition end point to a waste gas temperature rising start point, of a sintering material surface in a sintering machine into a region 1, a region 2 and a region 3; and in the sintering process, blowing a multi-component gas medium with a high fuel gas ratio to the region 1, a multi-component gas medium with a medium fuel gas ratio to the region 2, and a multi-component gas medium with a low fuel gas ratio to the region 3. By means of the method, the limitation of different heat requirements at different heights of a material layer can be met to a greater extent, the combustion efficiency of fuel is improved synergistically, the solid fossil fuel consumption is further reduced, the solid fuel consumption can be reduced by 6-10 kg, and the emission of CO2 is reduced by 18-30%, the emission of CO is reduced by 25-40%, and the emission of dioxin is reduced by 40-70%.

Description

technical field [0001] The present invention relates to a sintering method, in particular to a sintering method with low energy consumption and low emission by compound injection of multi-component gas medium, in particular to a method of injecting different components according to the characteristics of different sections of the sintering material layer and the heat demand. The invention relates to a method for synergistically improving fuel combustion efficiency, reducing consumption of solid fossil fuels, and reducing emissions by composing gaseous media, and belongs to the sintering industry in the field of iron and steel metallurgy. Background technique [0002] As a front-end process of the iron and steel industry, sintering has high energy consumption and heavy pollution load, which poses severe challenges to the clean production of the iron and steel industry. In the traditional sintering process, solid fossil fuels such as coke and anthracite are generally used as h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/16Y02P10/143
Inventor 季志云范晓慧甘敏赵元杰陈许玲黄晓贤袁礼顺武钰丰李浩锐
Owner CENT SOUTH UNIV
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