A selective catalytic reduction denitrification device

Abstract

The invention belongs to the technical field of denitration of flue gas, in particular to a selective catalytic reduction denitration device. The selective catalytic reduction denitration device comprises a flue gas injection pipe, an ammonia gas injection pipe, a mixing tank, an ammonia spraying device and a reactor, wherein the ammonia gas injection pipe is arranged at the bottom part of the mixing tank, the flue gas injection pipe is arranged at one side of the ammonia gas injection pipe, one side of the top part of the mixing tank is connected with the reactor through a pipeline, and a catalyst is arranged in the reactor; the ammonia spraying device is arranged in the mixing tank, and comprises a fixed pipe, a transmission shaft, a transmission gear, a connecting rod, a slide ring andan elastic spiral pipe. The selective catalytic reduction denitration device has the advantage that when the ammonia gas is sprayed out via the elastic spiral pipe of the ammonia spraying device, theconnecting rod is controlled by a motor to swing, the direction of the connecting rod corresponding to the fixing pipe is changed from the tangential direction into the vertical direction, the elasticspiral pipe is supported out by the connecting rod, the ammonia spraying range of the elastic spiral pipe is changed, and the ammonia gas sprayed by the elastic spiral pipe and the flue gas are fullymixed, and then are sent into the reactor to complete reduction reaction.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitration, in particular to a selective catalytic reduction denitration device. Background technique [0002] NOx is a major pollutant in air pollution. It can form photochemical smog, acid rain, destroy the ozone layer, and even lead to a serious greenhouse effect, which is extremely harmful to the human body, the environment and the ecosystem. Therefore, the treatment of NOx and the improvement of denitrification technology are of great significance to the protection of the ecological environment and the sustainable development of our country. [0003] At present, traditional denitration mainly adopts selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). Among them, the widely used SCR technology is an effective method to control NOx emissions. Its reducing agents include urea, ammonia water and pure ammonia. Usually, NH3 is used as a reducing agent to reduce NOx ...

AI Technical Summary

Problems solved by technology

[0005] This technical scheme can fully mix the ammonia gas and the flue gas, but the scheme sprays the ammonia gas through the swirl atomizing nozzle, which makes the concentration of the ammonia gas at the top higher, resulting in insufficient mixing of the ammonia gas and the flue gas. At the same time, The scope of the ammonia gas sprayed by the swirling flow is not easy to control, which affects the mixing of ammonia gas and flue gas, and restricts the efficiency of the subsequent reduction reaction

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