Method for urea catalyst simultaneously processing flue gas and desulfurizing denitrification

Abstract

The present invention relates to a method for desulfurization and denitrogenation at the same time of treating flue gas by using urea catalyst. Said method uses the urea as absorbing agent, and uses titanium dioxide or diatomite as catalyst to prepare absorption liquor, makes the flue gas mixw ith the absorption liquor to recover ammonium sulfate and ammonium nitrate, and can make comprehensive utilization to prepare fertilizer. Said invention is high-effective, can stably remove SO2 and NOx, the SO2 removing rate is up to above 95% and the NOx removing rate is up to 80%. It has no secondary pollution and is low in cost, so that it is suitable for industrial production.

Description

(1) Technical field [0001] The invention relates to the technical field of boiler flue gas purification and treatment, in particular to a method for simultaneously desulfurizing and denitrifying flue gas with a urea catalyst. (2) Background technology [0002] Air pollution is one of the most serious problems facing the survival and development of human society in the 21st century. The most serious air pollution is acidification pollution, which has a large amount of pollutants and a wide range of pollution, resulting in regional environmental acidification. Environmental acidification is mainly caused by sulfur dioxide-SO 2 (sulfur dioxide) and nitrogen oxides -NO X (nitrogen oxides), industrial production, transportation, waste incineration and civil combustion processes will emit SO 2 , NO X , especially boiler combustion pollution is the most serious, 90% of SO in the air 2 and 60% NO x Flue gas from boiler combustion. At present, there are mainly the following me...

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Problems solved by technology

However, the relative cost of the most critical additives used in this method is relatively high, which limits industrial application

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