Sintering flue gas denitration direct-fired type heating device and method

Abstract

The invention relates to a sintering flue gas denitration direct-fired type heating device. The sintering flue gas denitration direct-fired type heating device comprises a gas pipe (1) and a sinteringflue gas pipe (2), wherein the gas pipe and the sintering flue gas pipe are respectively connected with a gas chamber (42) and an oxidant gas chamber (41) of a direct-fired heating device body (4), and the oxidant gas chamber (41) and the gas chamber (42) are sequentially connected with a mixing combustion chamber (43) and a flue gas heating chamber (45), an inlet of flue gas heating chamber (45)is connected with a GGH heat exchanger (3), an outlet of the flue gas heating chamber (45)is connected with a denitration flue (7), an ammonia injection gird (8) is arranged above the denitration flue (7), a denitration catalyst (9) is arranged in a denitration reactor (6), the denitration reactor (6) is connected with the GGH heat exchanger (3), the GGH heat exchanger (3) is connected with an induced draft fan (10), and an outlet of the induced draft fan (10) is connected with one chimney (11). The sintering flue gas denitration direct-fired type heating device has the advantages of ensuringthe denitration efficiency, reducing CO content in flue gas and heated gas volume, and energy conservation and emission reduction.

Description

technical field [0001] The invention relates to the technical field of sintering flue gas denitrification, in particular to a direct-fired heating device and method for sintering flue gas denitrification. Background technique [0002] At present, the working range of SCR in the traditional selective catalytic reduction denitrification process is 280°C~400°C. If the desulfurized sintering flue gas is to be denitrified by a separate SCR device, it is necessary to reheat the sintering flue gas. The usual practice is that in order to reduce the heating energy consumption of denitrification flue gas, GGH heat exchanger is generally used to recover the waste heat of flue gas after denitrification, and the insufficient part uses hot blast stove to heat the sintering flue gas to be denitrated by burning gas. However, the hot blast stove occupies a large area, and the outlet of the hot blast stove will be mixed with high-temperature flue gas from the flue. The temperature is controll...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a direct-fired heating device for sintering flue gas denitrification, which can fully recover the sintering flue gas, in order to solve the problems of the existing sintering flue gas denitrification device occupying a large area, low CO recovery utilization rate and high VOC emission CO in the sintering flue gas can reduce the heating energy consumption of the denitrification flue gas, and can also reduce the VOC emission of the sintering flue gas

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