A kind of SCR industrial flue gas denitrification method

Abstract

The invention belongs to the technical field of flue gas denitrification and particularly relates to an SCR industrial flue gas denitrification method. The denitrification method comprises the following steps: introducing liquid ammonia in a liquid ammonia storage tank into a liquid ammonia evaporator and evaporating the liquid ammonia into ammonia gas; introducing the ammonia gas into a mixer, mixing the ammonia gas with air and converting the ammonia gas into mixed ammonia gas; introducing the mixed ammonia gas into an SCR flue gas denitrification system, introducing the flue gas to be denitrified into the SCR flue gas denitrification system, denitrifying and dedusting the flue gas; continuously carrying out subsequent treatment of the denitrified and dedusted flue gas, and simultaneously collecting water and dust in the SCR flue gas denitrification system. Through the SCR industrial flue gas denitrification method, the flue gas is introduced into a plurality of sub circulation pipes, so that the contact time of the flue gas with the ammonia gas and the catalyst can be prolonged, and the contact area of the flue gas with the ammonia gas and the catalyst can be expanded; the improvement of the flue gas denitrification effect is facilitated; an ammonia gas injection die is used for injecting the mixed ammonia gas into the flue gas, so that the mixed ammonia gas is fully mixed with the flue gas, and the improvement of the flue gas denitrification efficiency is facilitated.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, in particular to a method for denitrification of SCR industrial flue gas. Background technique [0002] Flue gas denitrification refers to the reduction of generated NOX to N2, thereby removing NOX in flue gas. According to the treatment process, it can be divided into wet denitrification and dry denitrification. Since more than 90% of the NOx in the flue gas discharged from the combustion system is NO, and NO is difficult to dissolve in water, so the wet treatment of NOx cannot use a simple washing method. The principle of flue gas denitrification is to oxidize NO into NO2 with an oxidant, and then absorb the generated NO2 with water or alkaline solution to achieve denitrification. Selective catalytic reduction SCR denitrification is to use ammonia, CO or hydrocarbons as reducing agents in the presence of catalysts, and reduce NO in flue gas to N2 in the presence of oxygen. NH...

AI Technical Summary

Problems solved by technology

[0004] This technical solution realizes the mixing of ammonia and NOx by generating two-stage swirling catalytic reduction reaction, which can improve the mixing of ammonia and NOx to a certain extent; The degree of mixing is limited. At the same time, when ammonia gas and flue gas generate swirling flow, it is easy to generate a swirling layer, and part of the flue gas and ammonia gas will not mix very uniformly, which is not conducive to the progress of flue gas denitrification.

Images