Sintering flue gas SCR denitration pretreatment device

Abstract

The embodiment of the invention provides a sintering flue gas SCR denitration pretreatment device comprising a reactor inlet flue, a hot air branch pipe and an ammonia water spray gun; the ammonia water spray gun is directly communicated with the hot air branch pipe at an outlet of a hot air furnace; the hot air furnace is used for blowing high-temperature hot air produced through the combustion of blast furnace gas into an SCR denitration system through the hot air branch pipe and the reactor inlet flue; when ammonia water is sprayed into the hot air branch pipe through the ammonia water spray gun, the high-temperature hot air makes mixed contact with the ammonia water to heat and evaporate the ammonia water, and ammonia gas generated after evaporation is sprayed into the reactor inlet flue through hot air nozzles arranged on the hot air branch pipe at equal intervals. Therefore, hot air and ammonia gas entering the section of the reactor inlet flue are blown in uniformly, and the utilization rate of the ammonia gas and the denitration efficiency of the SCR denitration system are improved.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a sintering flue gas SCR denitrification pretreatment device. Background technique [0002] Frequent smog weather has seriously endangered people's health. As one of the main components in smog, NOX mainly comes from the emission of flue gas from factory fuel combustion, which is especially obvious in the steel and thermal power industries. In the field of iron and steel industry, for sintering and other flue gas with low temperature, it is impossible to directly adopt economical, environmentally friendly and high-efficiency low-temperature SCR denitrification technology for treatment. [0003] At present, ammonia water evaporation is carried out by using an independently installed ammonia water evaporator. The heat source required for ammonia water evaporation is taken from the high-temperature hot flue gas at 280°C behind the SCR reactor. The ammonia gas genera...

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Problems solved by technology

[0004] In order to solve the above problems, the object of the present invention is to provide a sintering flue gas SCR denitrification pretreatment device, which is used to solve the problem that the SCR denitrification system in the prior art needs to be independently equipped with ammonia water evaporator, ammonia spray grid, dilution fan and supporting equipment. components such as pipelines, and the failure rate is high, and the investment cost and operating cost are high

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