Method for denitration in sintering process by using multiple flue gases

A sintering process, flue gas technology, applied in the field of energy saving and emission reduction, steelmaking and ironmaking tail gas treatment, can solve the problems of reducing the temperature of circulating flue gas, not meeting sintering production, low flue gas temperature, etc., to improve quality and denitrification efficiency The effect of increasing and reducing the amount of coke powder

Active Publication Date: 2022-05-13
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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  • Method for denitration in sintering process by using multiple flue gases
  • Method for denitration in sintering process by using multiple flue gases
  • Method for denitration in sintering process by using multiple flue gases

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specific Embodiment approach

[0027] The present invention proposes a mixed denitrification method using various flue gases, which mainly uses the desulfurized kiln flue gas from various processes such as blast furnaces, refining furnaces, hot blast stoves, and heating furnaces in steel mills to mix according to a certain proportion, so as to ensure that the sintered ore Under the premise of quality, the NOx produced in the sintering process is removed. Its removal effect is obviously more stable, no additional heating is required, no new pollutants are produced, and the cost is lower than that of SCR method and SNCR method, and the more effective use of other furnace flue gas also reduces the overall flue gas treatment the cost of.

[0028] For reaction (1) 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 balance constant K P It is only related to the reaction temperature and the nature of the reac...

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Abstract

The invention discloses a method for denitration in a sintering process by using various flue gases. The method comprises the following steps: carrying out component analysis on flue gases of different furnaces and kilns; assembling and mixing the flue gas in a gas holder, monitoring the components and the temperature of the flue gas at an outlet of the gas holder in real time, adjusting a flue gas assembling scheme, determining that the components CO and the temperature of the assembled flue gas meet the requirements, and enabling the assembled flue gas to pass through a sintering pallet in production; after flue gas in the first middle stage of sintering production comes out of an ore deposit, the flue gas is led to a sinter circular cooler for NO removal, and the flue gas with NO removed is subjected to waste heat recovery to form external circulation; and flue gas in the later stage of sintering production is used as sintering circulating flue gas to return to the gas holder and is subjected to flue gas assembly together with industrial flue gas to form internal circulation. The effect of treating waste with waste is obvious, and a new thought is provided for efficient emission reduction of NOx in the sintering process.

Description

technical field [0001] The invention relates to a method for denitration in a sintering process by utilizing various flue gases, and belongs 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 most stringent concentration in history not higher than 50mg / m 3 . At present, terminal treatment processes such as oxidation, activated carbon (coke), SCR or SNCR are generally used for denitrification of domestic sintering machines, which have a series of problems such as high operating costs, solid waste generation and ammonia escape. Therefore, based on the sintering process and flue gas characteristics, it is urgent to abandon the traditional terminal treatment and develop new green sintering technology for multi-pollutant process treatment. It ...

Claims

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Application Information

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Patent Type & Authority Applications(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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