Wet flue gas denitration technique for nitrite recovery

Abstract

The invention discloses a wet-method smoke denitration process used for recovering nitrite, comprising the steps as follows: hydrogen peroxide or ozone is taken as oxidant; the oxidant is uniformly sprayed into smoke disposed by pre-dedusting and desulfurizing so as to carry out gas oxidation reaction and lead the NO in the smoke to be oxidated as NO2; subsequently, alkali liquid is taken as absorbent so as to absorb the mixture of the oxidated NO and NO2 and generate the nitrite; the absorbent is concentrated after absorbing the NO and NO2 and cooled and crystallized; after centrifuging separation, the nitrite crystal is gained. The process of the invention can effectively remove the NOx in the smoke, gains the nitrite with high economic values at the same time, and realizes the resource utilization of denitration outgrowth.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a wet flue gas denitrification process for recovering nitrite. Background technique [0002] my country is rich in coal resources and cheap. It is the largest coal producer and consumer in the world, and one of the few countries in the world where coal is the main energy source. It is estimated that in the next 50 years, my country's energy structure dominated by coal will not Significant changes occur. According to statistics, China's total energy production in 2002 was 1.39 billion tons of standard coal, ranking third in the world, and its total energy consumption was 1.48 billion tons of standard coal, ranking second in the world. 70% of the country's soot emissions, 90% of sulfur dioxide emissions, 67% of nitrogen oxides, and 70% of carbon dioxide emissions come from coal combustion. In order to protect the environment and realize the sustainable development of...

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