Influence of demineralization using acid wash on N migration and transformation during pyrolysis of Shengli brown coal
MetadataShow full item record
This paper is to examine effects of inherent minerals in coal on N migration and transformation during the fast pyrolysis of Shengli brown coal at the temperatures of 773~1173 K in a bench-scale fluidized-bed quartz reactor. Based on the comparison between raw coal and acid-washed coal, we can find that the alkali Na and alkaline Ca were the key reasons for the difference in N evolutions from raw coal and demineralized coal during the pyrolysis. The Na and Ca could efficiently facilitate the formation of NH 3 and inhibit the production of HCN. The metallic species had obvious catalytic effects for the conversion from tar-N to NH 3 . Meantime, the existence of alkali and alkaline metals has enhanced the cracking reactions of coal char, thus reducing the yields of char and char-N. In addition, the relative amount of pyridinic (N-6) in demineralized coal char was higher than that in raw coal, while less quternary type nitrogen (N-Q) and pyrrolic nitrogen (N-5) were found in the demineralized coal char.
Showing items related by title, author, creator and subject.
Wen, C.; Xu, M.; Yu, D.; Sheng, C.; Wu, Hongwei; Zhang, P.; Qiao, Y.; Yao, H. (2013)The formation of PM10 (particles less than or equal to 10 µm in aerodynamic diameter) during char combustion in both air-firing and oxy-firing was investigated. Three Chinese coals of different ranks (i.e., DT bituminous ...
Gao, Xiangpeng (2011)Coal is an important part of Australia's energy mix and is expected to continue to play an essential role in supplying cheap and secure energy for powering the Australian economy in the foreseeable future. However, ...
Changes in char structure during the thermal treatment of nascent chars in N<inf>2</inf> and subsequent gasification in O<inf>2</inf>Zhang, L.; Li, T.; Wang, Shuai; Song, Y.; Dong, Li; Zhang, Shu; Li, Chun-Zhu (2017)© 2017 Elsevier LtdThis study aims to investigate the structural features of nascent char. Two nascent chars were prepared from the pyrolysis of Loy Yang brown coal and Collie sub-bituminous coal in a wire-mesh reactor ...