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A method for denitrification in sintering process using various flue gases

A sintering process and flue gas technology, which is applied in the fields of steelmaking and ironmaking tail gas treatment, energy saving and emission reduction, can solve the problems of not meeting sintering production, reducing the temperature of circulating flue gas, and low flue gas temperature, and achieve the improvement of denitrification efficiency and improvement Quality, reduce the effect of coke powder consumption

Active Publication Date: 2022-07-01
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, the flue gas temperature and composition of each bellows are different during sintering. The gas circulated in this mode is equivalent to the fusion of each bellows. The flue gas participating in the circulation has a low temperature, low oxygen content and a large amount of water. The air will further reduce the temperature of the circulating flue gas, which cannot meet the requirements of sintering production

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  • A method for denitrification in sintering process using various flue gases
  • A method for denitrification in sintering process using various flue gases
  • A method for denitrification in sintering process using various flue gases

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[0027] The method for denitrification by mixing various types of flue gas proposed by the present invention mainly uses the flue gas from the furnace after desulfurization in various processes such as blast furnaces, refining furnaces, hot blast furnaces, heating furnaces, etc. On the premise of quality, the NOx generated during the sintering process is removed. Its removal effect is significantly more stable, no additional heating is required, no new pollutants are generated, and the cost is lower than that of the SCR method and the SNCR method. the cost of.

[0028] For the reaction (1) the reaction standard equilibrium constant K θ It is only a function of temperature, as long as the reaction temperature is constant, then K θ must. Pressure Equilibrium Constant K P It is only related to the reaction temperature and the nature of the reaction. This reaction K is obtained by summing 2+2-2-1=1 according to the stoichiometric number P with K θ The relationship is shown i...

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Abstract

The invention discloses a method for denitrification in a sintering process by utilizing various types of flue gas, comprising the following steps: analyzing the components of flue gas from different kilns; assembling and mixing the flue gas in a gas cabinet, and monitoring at the outlet of the gas cabinet in real time Flue gas composition and temperature, adjust the flue gas composition plan, confirm that the composition CO and temperature of the assembled flue gas meet the requirements, so that the assembled flue gas passes through the sintering trolley being produced; After coming out, the flue gas is led to the sintered ore ring cooler for NO removal, and the flue gas after NO removal is used for waste heat recovery to form an external circulation; The flue gas is combined with the flue gas to form an internal circulation. The invention has obvious effect of treating waste by waste, and provides a new idea for efficient emission reduction of NOx in the sintering process.

Description

technical field [0001] The invention relates to a method for denitrification in a sintering process by utilizing a variety of flue gases, belonging to the field of steelmaking and ironmaking tail gas treatment, and the field of energy saving and emission reduction. Background technique [0002] With the advancement of the national ultra-low emission policy, the emission standard of nitrogen oxides in sintering flue gas has reached the strictest concentration in history, not higher than 50mg / m3 3 . At present, domestic sintering machine denitrification generally adopts end treatment processes such as oxidation method, activated carbon (coke) method, SCR method or SNCR method, which has a series of problems such as high operating cost, generation of solid waste and ammonia escape. Therefore, based on the sintering process and flue gas characteristics, it is urgent to abandon the traditional end-of-pipe treatment and develop a new green sintering process technology for multi-p...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D17/00
CPCF27D17/001F27D17/004F27D17/008
Inventor 李杰齐西伟赵欣锋张遵乾杨爱民刘卫星韩阳于复兴
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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