title: Experimental characterization of enhanced SNCR process with carbonaceous gas additives.
abstract: Carbonaceous gases such as CO and alkanes are commonly used as additives to enhance the selective non-catalytic reduction (SNCR) performance due to their high reducibility. This study compared the effect of CO and CH4on NO reduction in a tubular reactor with simulated flue gas. The enhancement of C3H8on SNCR process was tested at extremely low temperature, i.e. 650 °C. Experimental results suggested that reactions between NH3and SO2were favored at low temperatures and the competition for NH3between SO2and NO was influenced by gas additives. A maximum downward shift of 25 °C and 100 °C in temperature window for 50% NO reduction efficiency was obtained with the addition of CO and CH4, respectively. Considerable CO emission was observed with addition of CH4. The addition of CH4contributed to the formation of a self-accelerating reaction route within NO/O2/NH3SNCR reaction system. NO2produced from NO accelerates the oxidation of CH4to CO, while the oxidation of CH4returns to enhance the NO reduction globally. Optimal NO reduction of 44% was achieved with addition of C3H8at 650 °C. Substantial portion of C3H8was partially oxidized to CO and the remaining was converted into C2H4and C3H6during the SNCR process. Oxidative dehydrogenation of C3H8was involved. High reactivity of C3H6and C2H4favored the further oxidation and cracking to produce CO. These differences in oxidation behavior significantly influence the promotion capacities of CO, CH4and C3H8for NO reduction.
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Yao
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China. Electronic address: yfduan@seu.edu.cn.
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Duan
authors.affiliation: Dongfang Boiler Group Co., LTD, Dongfang Electric Group, Chengdu, Sichuan, 611731, China.
authors.forename: Zhizhong
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Dongfang Boiler Group Co., LTD, Dongfang Electric Group, Chengdu, Sichuan, 611731, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Li
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China.
authors.forename: Linwei
authors.initials: L
authors.lastname: Wang
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China.
authors.forename: Chun
authors.initials: C
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China.
authors.forename: Min
authors.initials: M
authors.lastname: She
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Liu
mesh_terms: D000473:Alkanes / Q000737:chemistry*; D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D010084:Oxidation-Reduction; D013696:Temperature
chemical_list: D000473:Alkanes; D002248:Carbon Monoxide
keywords: Carbonaceous gas additive; N(2)O (nitrous oxide); NO (nitric oxide); Oxidation behavior; SNCR