Ammonia spraying grid of SCR denitration system

Abstract

The ammonia spraying grid of the SCR denitration system comprises an ammonia spraying main pipe, ammonia spraying branch pipes, spraying heads and a rotational flow mixer, wherein the ammonia sprayingmain pipe is provided with the multiple ammonia spraying branch pipes, the ends, away from the ammonia spraying main pipe, of the ammonia spraying branch pipes are arranged upwards and connected withthe spraying heads, and the rotational flow mixer is fixed to the spraying heads; the rotational flow mixer comprises a barrel, a support and rotational flow blades, the barrel is of an up-down hollow structure, the inner wall of the barrel is connected with the spraying head through the support, and the rotational flow blades are fixed to the portion, above the support, of the inner wall of thebarrel in a circumferential array mode. The system has the advantages that through the arrangement of the rotational flow blades, flue gas in the SCR denitration system can generate strong rotationalmotion after flowing through the the rotational flow blades and can entrainment ammonia gas sprayed out of the spraying heads at the upper parts of the ammonia spraying branch pipes, so that the ammonia gas is strongly mixed with the flue gas, the mixing effect of the flue gas and the ammonia gas is enhanced, and the denitration reaction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of denitration equipment, in particular to an ammonia injection grid of an SCR denitration system. Background technique [0002] Coal-fired boilers are an important means of energy production in my country. With the development of the national economy, energy consumption is increasing year by year, and the problem of air pollution caused by flue gas has gradually become prominent and has become the focus of attention. Among them, nitrogen oxides (NOX), as one of the main pollutants in flue gas, are extremely harmful. Therefore, the control of nitrogen oxide pollution in flue gas has become an urgent problem to be solved in our country. At present, the flue gas denitrification technologies that have been practically applied in power plants in my country mainly include selective catalytic reduction (SCR) technology, selective non-catalytic reduction (SNCR) technology, and selective catalytic reduction-selecti...

AI Technical Summary

Problems solved by technology

The traditional ammonia injection system commonly used is the ammonia injection grid linear control type. The linear control ammonia injection grid is composed of a series of pipes with several nozzles arranged linearly on the flue section. The flow rate of each pipe can be adjusted individually to match The content of flue gas in various parts, but the mixing effect of the above-mentioned linear control ammonia injection grid flue gas and ammonia is not sufficient, resulting in low denitrification efficiency

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