Dry smoke cleaning process for desulfurizing and denitrating simultaneously and its system

Abstract

A dry method for simultaneously desulfurizing and denitrating fume includes using H2O2 or methanol to convert the NO in fume to NO2, using Ca-base particles as desulfurizing agent to react with SO2 to obtain calcium sulfate, and using ammonia water or urea as denitrating agent to react with NO2 to obtain ammonium nitrate and clean fume. Its apparatus is composed of additive sprayer, desulfurizing system and denitrating system.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and relates to the treatment of flue gas discharged from various combustion equipment, especially coal-fired boilers, and specifically refers to a dry flue gas cleaning process and system for simultaneous desulfurization and denitrification. Background technique [0002] The impact of industrial development on the environment mainly falls into the following two categories: one is transboundary pollution, such as sulfur dioxide SO 2 , NO x The acid rain produced is one type of local pollution, such as dust, ash, slag and waste water pollution in exhaust smoke, most of which are related to the smoke emitted by combustion equipment, especially coal-fired boilers. Therefore, flue gas purification is an urgent problem to be solved in coal-fired power plants in the world. [0003] my country is a country that uses coal as the main energy source, and coal-fired po...

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Problems solved by technology

The desulfurization by-products after flue gas purification are mainly composed of calcium sulfite CaSO 3 , while CaSO 3 It is difficult to reuse and has become the biggest obstacle in the engineering application of dry flue gas desulfurization technology

[0006] As far as the flue gas off-loading technology is concerned, at present, domestically, it is mainly aimed at low NO in the combustion process. x Generation has been extensively studied through various low NO x Technology designed a variety of low NO x burner, but the above-mentioned combustion technology cannot well meet the environmental protection requirements of clean flue gas, and is affected by factors such as coal quality characteristics, operating conditions, etc., and the distance from the increasingly stringent environmental protection requirements is getting farther and farther

The flue gas removal methods and equipment used in foreign coal-fired generating units are mainly the selective catalytic reduction method SCR or the selective non-catalytic reduction method SNCR. Although these methods can achieve high removal efficiency and meet very strict environmental protection requirements Standards, but its flue gas denitrification system is huge, the equipment composition is complex, and the investment and operation costs are high. It is difficult to meet the coordinated development requirements of my country's energy utilization and air pollution control.

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