Open AccessEffects of CO 2 and CO on the reduction of NO over calcined limestone or char in oxy‐fuel fluidised bed combustion
Author(s) -
Liao Xinjie,
Shao Jingai,
Zhang Shihong,
Li Xiangpeng,
Yang Haiping,
Wang Xianhua,
Chen Hanping
Publication year - 2019
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
ISSN - 1752-1424
DOI - 10.1049/iet-rpg.2018.6277
Subject(s) - char , calcination , combustion , reducing atmosphere , chemistry , atmosphere (unit) , catalysis , chemical engineering , waste management , materials science , organic chemistry , thermodynamics , physics , engineering
To reveal the effects of CO 2 and CO on the reduction of NO in oxy‐fuel fluidised bed combustion, NO–CO reduction catalysed by calcined limestone and NO–char reduction were studied in a suspension‐bed reactor under CO 2 or N 2 atmosphere with the CO concentration varied from 0.28 to 1.88%. Results showed that the calcined limestone is an effective catalyst for NO–CO reduction. The activation energy of NO–CO reduction over calcined limestone was 157–164 kJ/mol at low temperature (600–800°C) and decreased to 58.7–102.1 kJ/mol at high temperature (800–100°C). In CO 2 atmosphere, the NO conversion ratio was nearly zero during the NO–CO reduction process, and for NO–char reduction, the NO conversion ratio in CO 2 was lower than that in N 2 . However, CO showed promotion effect on NO reduction. In NO–CO reduction process, as the CO concentration increased from 0.28% to 1.88%, the NO reduction ratio increased from 0.40 to 0.75. For NO–char reduction in N 2 , the NO conversion ratio was obviously higher when 1% CO was introduced, and the promotion effect of CO became weaker as the temperature increased. Moreover, the promoting effect of CO was inhibited in CO 2 atmosphere.