Sintering flue gas heating denitration system and sintering flue gas heating denitration method

Abstract

The invention discloses a sintering flue gas heating denitration system and a sintering flue gas heating denitration method. The system comprises a GGH heat exchanger, an SCR reactor, a circulating fan and a heating furnace, wherein a cold air chamber and a hot air chamber which exchange heat with each other are arranged in the GGH heat exchanger, and heat exchange is conducted on flue gas entering the SCR reactor and flue gas exhausted by the SCR reactor. The method comprises the following steps that S1, original sintering flue gas enters the cold air chamber of the GGH heat exchanger and then is exhausted, and temperature rising is conducted; S2, the heated flue gas is subjected to denitration and dust removal through alkali liquor spraying; S3, the flue gas subjected to denitration anddust removal enters the hot air chamber of the GGH heat exchanger, is cooled after exchanging heat with the flue gas in the cold air chamber, and the cooled flue gas is discharged; and S4, the flue gas in the cold air chamber and the flue gas in the hot air chamber are heated after heat exchange, and part of the heated flue gas and the original sintering flue gas are mixed and then circulated backto the cold air chamber. According to the invention, the denitration temperature is controlled by adjusting the circulation proportion, so that the denitration effect is guaranteed, and ultra-low emission is achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy and environmental protection, in particular to a system and method for raising the temperature of sintering flue gas and denitration. Background technique [0002] Sintering flue gas is a complex gas containing multiple pollutants, which needs to be dedusted, desulfurized, and denitrified. The sintering flue gas after desulfurization has low temperature and high humidity, and needs to be heated to reach the temperature required for denitrification. If it directly enters the GGH heat exchanger, scaling may occur, which will affect the long-term stable operation of the system. Contents of the invention [0003] The present invention aims to solve the above technical problems to a certain extent. [0004] In view of this, the present invention provides a sintering flue gas heating denitrification system and method, which adjusts the circulation ratio, controls the denitrification temperature, e...

AI Technical Summary

Problems solved by technology

The sintering flue gas after desulfurization has low temperature and high humidity, and needs to be heated to reach the temperature required for denitrification. If it directly enters the GGH heat exchanger, it may foul and affect the long-term stable operation of the system.

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