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Method for enriching and recovering carbon dioxide in iron mine sintering smoke gas

A technology for sintering flue gas and carbon dioxide, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve the problems of limited enrichment, failure to achieve high-efficiency separation, and concentration requirements for capture, and achieve high separation efficiency. , low cost, and the effect of achieving zero emissions

Active Publication Date: 2015-04-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the proportion of flue gas circulation is mostly around 35%, the CO 2 The degree of enrichment is limited, and the concentration can generally only be increased from 6% to 10% to 10% to 20%, which cannot reach CO 2 Concentration requirements for efficient separation and capture

Method used

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  • Method for enriching and recovering carbon dioxide in iron mine sintering smoke gas

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Experimental program
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Effect test

Embodiment 1

[0024] Raw material conditions for sintering: batching according to the mass ratio of 61.41% mixed iron ore, 5.61% dolomite, 2.05% limestone, 3.85% quicklime, 23.08% sintered return ore, and 4.00% coke powder (the main chemical composition of the obtained sintered ore is: TFe58. 33%, SiO25.0%, R1.9, MgO2.3%). The above-mentioned sintering raw materials are distributed into the sintering machine 1 through the distributing device 2 for sintering.

[0025] The head flue gas accounting for 50% of the total volume of the flue gas is exported first through the second condensing device 13 to condense and remove part of the water vapor, and then merge with the tail flue gas accounting for 20% of the total volume of the flue gas to form a circulating flue gas. Through the second dust remover 14 and the second exhaust fan 15 in turn, it is passed into the fume hood 4 completely covering the sintering machine 1, and industrial pure oxygen is mixed into the fume hood 4, and at the same ti...

Embodiment 2

[0027] Raw material conditions for sintering: batching according to the mass ratio of mixed iron ore 61.22%, dolomite 5.01%, limestone 2.33%, quicklime 4.51%, sintering return ore 23.08%, coke powder 3.85% (the main chemical composition of the obtained sinter is: TFe57. 7%, SiO24.9%, R2.0, MgO1.8%). The above-mentioned sintering raw materials are distributed into the sintering machine 1 through the distributing device 2 for sintering.

[0028] After leading out the head flue gas accounting for 55% of the total flue gas volume, it first passes through the second condensing device 13 to condense and remove part of the water vapor, and then merges with the tail flue gas accounting for 25% of the total flue gas volume to form circulating flue gas. The gas passes through the second dust remover 14 and the second exhaust fan 15 in turn into the fume hood 4 that completely covers the sintering machine 1, and industrial pure oxygen is mixed into the fume hood 4, and at the same time, ...

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Abstract

The invention discloses a method for enriching and recovering carbon dioxide in iron mine sintering smoke gas. According to the method, head smoke gas is subjected to partial water vapor removal through condensation, and is then merged with tail smoke gas to be used as circulation smoke gas, the circulation smoke gas simultaneously circulates to a smoke cover covering a sintering machine for being used for iron mine sintering, oxygen gas is mixed so that the O2 concentration entering the sintering material layer meets the fuel burning requirements, the head smoke gas and the tail smoke gas in cyclic utilization account for 70 percent to 80 percent of the total volume of the smoke gas, the CO2 concentration of non-circulated middle gas is greatly improved, and then, the non-circulated middle gas is subjected to CO2 separation and recovery treatment. The method has the characteristics that the separation efficiency is high, the cost is relatively low, in addition, the sintering ore yield and quality indexes cannot be influenced, and the zero discharge of sintering smoke gas is basically realized.

Description

technical field [0001] The invention relates to a method for treating iron ore sintering flue gas, in particular to a method for enriching and recovering carbon dioxide in iron ore sintering flue gas. Background technique [0002] Sintering provides more than 75% of the iron-containing charge for blast furnace ironmaking. It is an important raw material processing process for iron and steel enterprises, and it is also a typical high-energy consumption and high-pollution link. The energy consumption of its process is 9%-12% of the total energy consumption of iron and steel enterprises. It ranks second only to the ironmaking process. Coal-based solid fuel consumption accounts for 80% of the total energy consumption of sintering, and fossil fuel combustion is CO x , SO x , NO x It is the main source of many kinds of pollutants, and it is the main cause of the three major environmental problems of greenhouse effect, acid rain and ozone layer destruction. Currently, sintering...

Claims

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Application Information

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IPC IPC(8): F27D17/00B01D53/00C01B31/20C01B32/50
CPCY02P10/122Y02P20/151
Inventor 甘敏范晓慧陈许玲姜涛李光辉袁礼顺黄柱成郭宇峰杨永斌李骞张元波朱忠平许斌季志云余志元周阳何向宁吕军强
Owner CENT SOUTH UNIV