TY - GEN
T1 - Effect of cement raw material and oxygen concentration on SNCR reaction
AU - Wang, Ya Li
AU - Li, Nan
AU - Peng, Si Yu
AU - Zhang, Yun Ning
AU - Chen, Mei Na
AU - Cui, Su Ping
N1 - Publisher Copyright:
© 2018 Trans Tech Publications, Switzerland.
PY - 2018
Y1 - 2018
N2 - As the selective non-catalytic reduction denitration(SNCR denitration) was used in cement decomposition furnaces under the high concentration cement raw materials and complex flue gas composition, the denitration efficiency is poor and the reducing agent is largely consumed.In order to meet the more stricter requirements of environmental protection, there is an urgent need to improve the denitration efficiency of SNCR and reduce the escape of reducing agentsin order to prevent the unnecessary waste caused by excessive use of reducing agents and secondary atmospheric pollution.Therefore, studying the effect of cement raw materials and O2 concentration on SNCR process is very important. In this paper, the initial concentration of NO and the ammonium to nitrogen ration (CNH3/CNO) was 800ppm and 1.5, respectively. The effects of cement raw material and oxygen concentration on the reaction process of NH3 +NO+O2 in the temperature range of 750℃-1100℃ were investigated by means of denitration rate, in Situ DRIFTS analysis.The results demonstrate when O2 concentration was 5% and denitration temperature was 950℃, the deNOx rate reached a maximum of 89.64%, which due to O2 promoted NH3 and NO to react with O2 to produce N2 and H2 O. However,under the effect of cement raw material, O2 can promote NH3 which was adsorbed on the surface of cement raw material to react with O2 and produce NO and H2 O, and the reaction of oxidation of NH3 is dominant, therefore, the denitration reaction is inhibited..When O2 concentration was 5% and temperature was 850℃, the deNOx rate reached a minimum value of -109.09%. the high concentration cement raw material and flue gas composition reduce the denitration efficiency of cement kiln.
AB - As the selective non-catalytic reduction denitration(SNCR denitration) was used in cement decomposition furnaces under the high concentration cement raw materials and complex flue gas composition, the denitration efficiency is poor and the reducing agent is largely consumed.In order to meet the more stricter requirements of environmental protection, there is an urgent need to improve the denitration efficiency of SNCR and reduce the escape of reducing agentsin order to prevent the unnecessary waste caused by excessive use of reducing agents and secondary atmospheric pollution.Therefore, studying the effect of cement raw materials and O2 concentration on SNCR process is very important. In this paper, the initial concentration of NO and the ammonium to nitrogen ration (CNH3/CNO) was 800ppm and 1.5, respectively. The effects of cement raw material and oxygen concentration on the reaction process of NH3 +NO+O2 in the temperature range of 750℃-1100℃ were investigated by means of denitration rate, in Situ DRIFTS analysis.The results demonstrate when O2 concentration was 5% and denitration temperature was 950℃, the deNOx rate reached a maximum of 89.64%, which due to O2 promoted NH3 and NO to react with O2 to produce N2 and H2 O. However,under the effect of cement raw material, O2 can promote NH3 which was adsorbed on the surface of cement raw material to react with O2 and produce NO and H2 O, and the reaction of oxidation of NH3 is dominant, therefore, the denitration reaction is inhibited..When O2 concentration was 5% and temperature was 850℃, the deNOx rate reached a minimum value of -109.09%. the high concentration cement raw material and flue gas composition reduce the denitration efficiency of cement kiln.
KW - Cement raw materials
KW - DeNOx rate
KW - Oxygen concentration
KW - Selective non-catalytic reduction
UR - http://www.scopus.com/inward/record.url?scp=85043593059&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.913.969
DO - 10.4028/www.scientific.net/MSF.913.969
M3 - Conference contribution
AN - SCOPUS:85043593059
SN - 9783035712445
T3 - Materials Science Forum
SP - 969
EP - 975
BT - Functional and Functionally Structured Materials II - Chinese Materials Conference 2017, CMC 2017
A2 - Fang Han, Ya
PB - Trans Tech Publications Ltd.
T2 - Chinese Materials Conference, CMC 2017
Y2 - 6 July 2018 through 12 July 2018
ER -