Flue gas denitration, refers to the generated NOX reduction of N2, thus removing the NOX in flue gas, according to the governance process can be divided into denitration by wet method and dry denitration. Mainly includes: acid absorption method, alkali absorption method and selective catalytic reduction method, selective non catalytic reduction method, adsorption method, plasma activation method, etc. Some researchers at home and abroad has also developed with microbial method to deal with NOX exhaust gas.
Due to the NOx in flue gas emissions from the burning system, 90% above is NO, and NO poorly soluble in water, so the wet processing of NOx cannot use simple washing method. The principle of flue gas denitration is NO oxidation with oxidant into NO2, generated NO2 or alkaline solution with water absorption, so as to realize the denitration. O3 oxidation absorption with O3 into NO2 NO oxidation, and water absorption. The law of products subject to concentrated HNO3 liquid handling, preparing and O3 need high voltage, high initial investment and operation cost. ClO2 REDOX process ClO2 NO oxidation into NO2, and then the NO2 reduction with Na2SO3 aqueous solution into N2. The law can and using NaOH as desulfurizer wet desulphurization technology used in combination, the desulfurization reaction product Na2SO3 and can be used as a reductant NO2. ClO2 method of denitration rate of up to 95, and at the same time the desulfurization, but the price is higher ClO2 and NaOH, operation cost increases.