산업폐기물 소각로에서 SNCR 공정에 의한 NOx 제거효율에 관한 연구

A Study on NOx Removal Efficiency using SNCR Process in the Industrial Waste Incineration Plant

The environmental regulations in the world has been reinforced and many nations has devoted themselves to the development of cost-effective technology. Selective catalyst reduction(SCR) and selective non-catalyst reduction (SNCR) processes are mainly used to treat nitrogen oxidants generated from fossil-fuel combustion. One of these typical technologies for reduction of de-NOx is SNCR process has increased continuously because of the low cost for building and maintenance. Nevertheless the researches on the application to real scale plant by the reductant like Urea are rarely studied. In this paper, an experimental investigations were performed on the SNCR process in the industrial waste incineration plant. With no reducing agent, the concentration of NOx stayed in around 180 ppm (O2 12%) with the exhausting temperature of 950oC and changed within the range of 20 ppm to remain relatively consistent. When 10wt% of a solution was added, the efficiency of denitrification reached above 61.4% with the NSR of 2.0 and the exhausting temperature of 950oC. When the concentration of the urea solution was set to 10wt% and the sprinkling to four nozzles, the reaction temperature was reduced to about 50~100oC with a mixture of 10wt% CH3OH and 5wt% Na2CO3 in 40wt% of the solution. The NOx removal efficiency increased to 78.4%, achieving a broader and expansive range of reaction temperatures than the addition of an unmixed pure solution.