Investigation on coal pyrolysis in CO{sub 2} atmosphere

Journal Article · Wed Jul 15 04:00:00 EDT 2009 · Energy and Fuels

DOI:https://doi.org/10.1021/ef9002473· OSTI ID:21233742

Duan, Lunbo; Zhao, Changsui; Zhou, Wu; Qu, Chengrui; Chen, Xiaoping ^[1]

---

1. Institute for Thermal Power Engineering of Southeast University, Nanjing (China)

Considerable studies have been reported on the coal pyrolysis process and the formation of SO{sub 2} and NOx processors such as H{sub 2}S, COS, SO{sub 2}, HCN, and NH{sub 3} in inert atmospheres. Similar studies in CO{sub 2} atmosphere also need to be accomplished for better understanding of the combustion characteristics and the SO{sub 2}/NOx formation mechanism of oxy-fuel combustion, which is one of the most important technologies for CO{sub 2} capture. In this study, thermogravimetry coupled with Fourier Transform Infrared (TG-FTIR) analysis was employed to measure the volatile yield and gas evolution features during coal pyrolysis process in CO{sub 2} atmosphere. Results show that replacing N{sub 2} with CO{sub 2} does not influence the starting temperature of volatile release but seems to enhance the volatile releasing rate even at 480{sup o}C. At about 760{sup o}C, CO{sub 2} prevents the calcite from decomposing. In CO{sub 2} atmosphere, the volatile yield increases as the temperature increases and decreases as the heating rate increases. COS is monitored during coal pyrolysis in CO{sub 2} atmosphere while there are only H{sub 2}S and SO{sub 2} formed in N{sub 2} atmosphere. The COS is most likely formed by the reaction between CO{sub 2} and H{sub 2}S. No NH{sub 3} was monitored in this study. In CO{sub 2} atmosphere, the gasification of char elevates the conversion of char-N to HCN. The HCN yield increases as the temperature increases and decreases as the heating rate increases. 20 refs., 13 figs., 3 tabs.

• OSTI ID: 21233742
• Journal Information: Energy and Fuels, Journal Name: Energy and Fuels Journal Issue: 7 Vol. 23; ISSN ENFUEM; ISSN 0887-0624
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CARBON DIOXIDE
CARBON OXYSULFIDE
COAL
DEVOLATILIZATION
HEATING RATE
HYDROCYANIC ACID
OXYFUEL COMBUSTION PROCESS
PYROLYSIS
TEMPERATURE DEPENDENCE
THERMAL GRAVIMETRIC ANALYSIS