TY - JOUR
T1 - Release of nitrogen and sulphur species from low-rank coal during entrained flow pyrolysis and gasification
AU - Xu, Tao
AU - Wu, Yongping
AU - Bhattacharya, Sankar
N1 - Funding Information:
The authors thank the support from Monash University and Xi'an University of Science and Technology . The research is financially supported by the Natural Science Basic Research Program of Shaanxi (Program No. 2022JM-232 ).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/11
Y1 - 2022/11
N2 - This paper investigated the emission of N and S species during pyrolysis and gasification of Maddingley and Yallourn coal in an entrained flow reactor. Nitrogen pollutants (HCN and NH3) and sulphur pollutants (H2S and COS) were investigated under different temperatures (1000–1400 °C) and CO2 concentrations (10–40%). The release of N and S species during the two gasification processes, direct and two-step gasification, were also studied. It was found that no NH3 and COS were detected during pyrolysis and gasification of coal. The N and S in coal were mainly converted to gas-N (>60%) and gas-S (>50%) during entrained flow pyrolysis. Coal-N and Coal-S were converted to nearly 100% gaseous nitrogen and sulphur species during entrained flow gasification. High temperature improved H2S and HCN emissions during coal pyrolysis. High temperature promoted the HCN release during entrained flow gasification, whereas elevated CO2 concentration inhibited H2S and HCN emission. The majority of H2S and HCN emissions came from the pyrolysis part during two-step gasification. Direct coal gasification released less H2S and HCN than two-step gasification. The results provide essential information for the gas cleaning process downstream of entrained flow gasifiers.
AB - This paper investigated the emission of N and S species during pyrolysis and gasification of Maddingley and Yallourn coal in an entrained flow reactor. Nitrogen pollutants (HCN and NH3) and sulphur pollutants (H2S and COS) were investigated under different temperatures (1000–1400 °C) and CO2 concentrations (10–40%). The release of N and S species during the two gasification processes, direct and two-step gasification, were also studied. It was found that no NH3 and COS were detected during pyrolysis and gasification of coal. The N and S in coal were mainly converted to gas-N (>60%) and gas-S (>50%) during entrained flow pyrolysis. Coal-N and Coal-S were converted to nearly 100% gaseous nitrogen and sulphur species during entrained flow gasification. High temperature improved H2S and HCN emissions during coal pyrolysis. High temperature promoted the HCN release during entrained flow gasification, whereas elevated CO2 concentration inhibited H2S and HCN emission. The majority of H2S and HCN emissions came from the pyrolysis part during two-step gasification. Direct coal gasification released less H2S and HCN than two-step gasification. The results provide essential information for the gas cleaning process downstream of entrained flow gasifiers.
KW - Entrained flow
KW - Gasification
KW - Low-rank coal
KW - Nitrogen and sulphur species
KW - Pyrolysis
UR - http://www.scopus.com/inward/record.url?scp=85139867526&partnerID=8YFLogxK
U2 - 10.1016/j.jaap.2022.105741
DO - 10.1016/j.jaap.2022.105741
M3 - Article
AN - SCOPUS:85139867526
SN - 0165-2370
VL - 168
JO - Journal of Analytical and Applied Pyrolysis
JF - Journal of Analytical and Applied Pyrolysis
M1 - 105741
ER -