Selective sintering-machine flue-gas heat exchange and denitration system and method thereof

Abstract

The invention provides a selective sintering-machine flue-gas heat exchange and denitration system and a method thereof. The selective sintering-machine flue-gas heat exchange and denitration system comprises a sintering machine (20), a primary heat exchanger (7), a second heat exchanger (8), a denitration device (9), a main dust remover (12) and a desulphurization device (13), wherein a high nitrogen oxide wind box (1) of the sintering machine (20) is sequentially communicated with the primary heat exchanger (7), the denitration device (9), the main dust remover (12) and the desulphurization device (13), and a high-temperature wind box (2) of the sintering machine (20) is communicated with the main dust remover (12) through the primary heat exchanger (7). According to the method, waste heat of high temperature flue gas of the sintering machine and sintered ore cooling equipment is utilized, and heating and temperature increasing of NOx flue gas can be achieved without any external heating source. By the adoption of the system and the method, denitration efficiency of the selected flue gas reaches up to 80%-90%, and therefore NOx emission of the flue gas in the whole sintering machine is superior to a national standard under low investment and operating costs.

Description

technical field [0001] The invention relates to the technical field of steam and flue gas denitrification, in particular to a selective sintering machine flue gas heat exchange denitrification system, and a selective sintering machine flue gas heat exchange denitrification method. Background technique [0002] With the development of the national economy and the improvement of people's living standards, people pay more and more attention to environmental issues. As a pollutant closely related to air quality, nitrogen oxides have always been the focus of the country. As a key source of NOx emissions, sintering machines in iron and steel enterprises have also received more and more attention for their denitrification. The "Twelfth Five-Year Plan for the Prevention and Control of Air Pollution in Key Areas" clearly requires the comprehensive implementation of nitrogen oxide pollution prevention and control, and the active demonstration of sintering machine flue gas denitrificat...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem that the existing denitrification device needs an additional heat source for flue gas heating and denitrification

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