The influence of organic components in sludge on selective non-catalytic reduction denitrification

Abstract

Collaborative disposal of sludge has been applied extensively in cement industry kilns， but the influence of organic components in sludge on the SNCR denitrification is still in highly demanding. This paper focuses the influence of ethanol, n-octane, benzene and acetone on the SNCR denitrification, and the influence of ethanol are analyzed on SNCR denitrification under different flue gas condition. The result showed that •H and •OH as active groups are produced during the combustion of organic components, promoting the generation of •NH 2 from NH 3 , and therein the lower reaction temperature of SNCR. When the temperature of SNCR reaction is at 750~800℃, the denitrification rate of four organic components is: ethanol > benzene > n-octane > acetone. The optimum denitrification rate on SNCR can reach as high as 90.377% when the reaction condition is: the NH 3 /NO is 1, the ethanol concentration is 1000ppm, O 2 concentration is 2% and temperature is 750℃. In this paper, the influence of organic components in sludge on SNCR denitrification will be analyzed, which provides a theoretical basis for the selection of sludge dosing method for cement kiln collaborative disposal.