Ammonia oxidation denitrification process and reaction device

Abstract

The present invention provides an ammonia oxidizing denitration process for flue gas denitration treatment. Ozone oxidation, hydrogen peroxide oxidation and ammonia absorption are orderly and organically combined, in order to achieve efficient flue gas denitration treatment. The treatment process has low energy consumption, low operating costs and high absorption rate, is able to recycle nitrogen resources, and does not produce secondary pollution caused by the escape of ammonia. At the same time, the present invention also provides an ammonia oxidizing denitrification reaction apparatus, which is beneficial for the flue gas continuous treatment, and improves the processing efficiency.

Description

technical field [0001] The invention relates to the technical field of flue gas denitration, in particular to an ammonia oxidation and denitration process, and also relates to an ammonia oxidation and denitration reactor suitable for the process. Background technique [0002] Coal resources are the main energy source in our country, but a large amount of nitrogen oxides (NOx) will be emitted after coal combustion. NOx can not only form acid rain and other secondary pollutants, but also seriously endanger human health and directly affect people's normal life. During the "Twelfth Five-Year Plan" period, my country will reduce NOx emissions as one of the main goals, so the flue gas must be treated with efficient denitrification to meet the emission standards. [0003] At present, the commonly used methods for flue gas denitrification in industry include selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR) and the combined denitrification method of SCR-S...

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Problems solved by technology

[0003] At present, the commonly used methods for flue gas denitrification in industry include selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR) and the combined denitrification method of SCR-SNCR. Will N 2 and H 2 Synthetic NH 3 , while N 2 and H 2 All need to use fossil fuels as raw materials to prepare through complex processes such as gas generation, decarbonization, and desulfurization. Therefore, the reduction denitrification technology relies on a large amount of fossil fuels to achieve denitrification, which does not conform to the concept of circular economy, and the process cost is high.

Ammonia oxidative denitrification is a method that can make NOx resources, but the traditional ammonia oxidative denitrification process is easy to cause ammonia to escape and form secondary pollution

Chinese patent application CN103801176A discloses a method of using ozone to oxidize all nitric oxide into dinitrogen pentoxide for efficient denitrification. However, due to the instability of dinitrogen pentoxide, it is necessary to control the temperature of the flue gas during the denitrification process. To maintain the stability of dinitrogen pentoxide, but this method is not suitable for production and application, because the flue gas temperature in production is very high and changes greatly, which is not conducive to cooling control and may easily cause unstable denitrification effect

Chinese patent application CN104971594A discloses a gas-phase oxidation-liquid-phase oxidation-absorption three-stage dry-wet flue gas denitration process, which uses ozone as a gas-phase oxidant, hydrogen peroxide, sodium hypochlorite, sodium chlorite, sodium chlorate, high Any one or more of potassium manganate and potassium bicatalyst is used as a liquid-phase oxidant, and magnesium hydroxide is used as an absorbent. This process method cannot realize the resource utilization of nitrogen, which is not conducive to the recycling of resources.

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