Efficient medium and low temperature sulfur-containing flue gas denitration device and method based on Fast SCR reaction

Abstract

The invention discloses an efficient medium and low temperature sulfur-containing flue gas denitration device and method based on Fast SCR reaction, and the sulfur-containing flue gas denitration device and method can be used in a utility boiler and flues on the tail portions of various industrial furnace. The sulfur-containing flue gas denitration device comprises an oxidization module used for oxidizing NO and an SCR reaction module used or denitration, part of NO in flue gas is converted into NO2 through the oxidization module and then enters the SCR reaction module, and pre-oxidized flue gas and sprayed NH3 are mixed and enter a selective catalytic reduction layer to conduct rapid SCR reaction. The catalytic reduction layer is made of a low-vanadium loaded vanadium, tungsten and titanium cellular catalyst, and the reaction temperature is 200-350 DEG C. The denitration system has efficient sulfur poisoning resistance and greatly promotes denitration efficiency of the flue gas low-temperature section, it is verified through experiments that under the low-temperature sulfur-containing flue gas atmosphere at the temperature of 250 DEG C, the system has the obvious denitration effect, and the efficiency can reach 90% or more and is kept stable.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, and in particular relates to a device and method for high-efficiency denitrification of medium-low temperature sulfur-containing flue gas based on Fast SCR reaction. Background technique [0002] At the beginning of 2016, in the face of the increasingly severe air pollution situation, the country proposed a more stringent "ultra-low emission" standard, targeting at nitrogen oxides, the nitrogen oxides of coal-fired power plants will be 100mg / m 3 The emission limit was reduced to 50mg / m 3 . At the same time, the state has also proposed stricter nitrogen oxide emission standards for glass factories, cement factories, steel companies and other small industrial furnaces. At present, selective catalytic reduction (SCR) flue gas denitrification is the most mature flue gas denitrification technology, but the current SCR denitrification is mainly based on medium and high temperature fl...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of low-temperature SCR denitrification efficiency and sulfur poisoning in the prior art, the present invention provides a high-efficiency denitrification device and method for medium and low-temperature sulfur-containing flue gas based on Fast SCR reaction, which can effectively avoid catalyst denitrification at low temperature. Solve the problem of sulfur poisoning, significantly improve the low-temperature denitrification efficiency of the catalyst, and greatly reduce energy consumption and system operating costs due to the reduction of the heating link of the flue gas

Images