Sinter sensible heat recycling and flue gas denitration system and implementation method thereof

Abstract

The invention relates to a sinter sensible heat recycling and flue gas denitration system and an implementation method thereof. The method includes the steps that after two paths of sintering flue gas coming out of a sintering machine pass through a dust collector, one path of sintering flue gas carries out heat exchange with high-temperature sinter which comes out of the sintering machine and has the average temperature of 600-1,000 DEG C, and is heated to 450-650 DEG C and mixed with the other path of sintering flue gas of the temperature of 100-190 DEG C, the mixture enters an SCR reactor after the temperature reaches 200-400 DEG C, a catalytic reduction reaction is carried out in the SCR reactor, nitric oxides in the sintering flue gas are removed, and the sintering flue gas with the nitric oxides removed enters a waste heat boiler for flue gas waste heat recovery. The problem that currently, sintering flue gas Nox is hard to remove is solved, sensible heat of the sinter and the sintering flue gas is fully recycled, and sintering energy saving and emission reduction are truly achieved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of sinter flue gas denitrification and energy recovery, in particular to a sinter sensible heat recovery and simultaneous flue gas denitrification system and its realization method, that is to use the sensible heat of sinter to increase the temperature of sinter flue gas to meet SCR denitrification At the same time, the recovery and utilization rate of sinter waste heat is greatly improved. Background technique [0002] my country is a big steel producing country with the highest total steel output in the world. It is also a key monitoring object for national pollutant discharge. In 2011, the energy consumption of the national iron and steel industry exceeded 400 million tons of standard coal, accounting for more than 15% of the country's total energy consumption. Therefore, iron and steel Industrial energy conservation and emission reduction is an important aspect of my country's energy co...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a sinter sensible heat recovery and flue gas denitrification system and its realization method for the above-mentioned prior art, which not only solves the problem that NOx is difficult to remove from sinter flue gas, but also fully recovers sinter and Sensible heat of sintering flue gas realizes energy saving and emission reduction of sintering in a real sense

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