Nitrogen oxide removal process based on hydrogen peroxide catalytic oxidation

Abstract

The invention relates to the fields of industrial catalysis and environmental management, and particularly relates to a nitrogen oxide removal process based on hydrogen peroxide catalytic oxidation. A hydrogen peroxide solution is directly sprayed into a flue after passing through an atomizer; after the hydrogen peroxide solution is mixed with flue gas, a mixture enters a catalyst layer; the mixture is activated under the contact action of a catalyst; NO in the flue gas is oxidized into high valence lyotropic nitrogen oxides such as NO2, N2O4, N2O5 and the like; absorption processing is carried out by using alkali slurry to remove the nitrogen oxides in the flue gas. The process is simple, easy to operate, compact in device structure, good in economy and flexible to regulate, has various mode configurations, and can implement efficient denitration. Meanwhile, the catalyst used in the technical process uses nano titanium dioxide as a carrier and uses one or more of ceric oxide, cobaltosic oxide, nickel oxide, chromium sesquioxide and manganese dioxide as active ingredients; the catalyst is low in price and simple in preparation process.

Description

technical field [0001] The invention relates to the field of industrial catalysis and environmental treatment, in particular to a process for removing nitrogen oxides based on catalytic oxidation of hydrogen peroxide. Background technique [0002] The main source of flue gas pollutants is the combustion of fuels, including coal, coke, heavy oil, diesel, coal gas, natural gas, etc. Harmful substances such as nitrogen oxides (NOx) produced along with fuel combustion will cause harm to human health and the surrounding environment. According to the "2015 China Environmental Status Bulletin" issued by the Ministry of Environmental Protection, my country's total nitrogen oxide emissions in 2015 were 18.518 million tons, of which industrial nitrogen oxide emissions are still the main source. Since 2011, policy documents related to environmental protection have become more and more strict, and strict regulations have been imposed on the reduction of total NOx emissions in various i...

AI Technical Summary

Problems solved by technology

However, in its practical application to remove nitrogen oxides from flue gas, the way to stimulate hydrogen peroxide to activate and decompose is mostly ultraviolet light irradiation, and the technology of using its gas-phase catalytic oxidation combined with liquid-phase absorption to remove nitrogen oxides is not mature enough. And the most commonly used catalysts such as FeOx and ZrOx show low catalytic denitrification ability in the low temperature range, making it difficult to achieve efficient denitrification