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Title: Investigation on coal pyrolysis in CO{sub 2} atmosphere

Abstract

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{submore » 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.« less

Authors:
; ; ; ;  [1]
  1. Institute for Thermal Power Engineering of Southeast University, Nanjing (China)
Publication Date:
OSTI Identifier:
21233742
Resource Type:
Journal Article
Journal Name:
Energy and Fuels
Additional Journal Information:
Journal Volume: 23; Journal Issue: 7; Journal ID: ISSN 0887-0624
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; PYROLYSIS; CARBON DIOXIDE; THERMAL GRAVIMETRIC ANALYSIS; DEVOLATILIZATION; TEMPERATURE DEPENDENCE; HEATING RATE; HYDROCYANIC ACID; CARBON OXYSULFIDE; OXYFUEL COMBUSTION PROCESS

Citation Formats

Duan, Lunbo, Zhao, Changsui, Zhou, Wu, Qu, Chengrui, and Chen, Xiaoping. Investigation on coal pyrolysis in CO{sub 2} atmosphere. United States: N. p., 2009. Web. doi:10.1021/ef9002473.
Duan, Lunbo, Zhao, Changsui, Zhou, Wu, Qu, Chengrui, & Chen, Xiaoping. Investigation on coal pyrolysis in CO{sub 2} atmosphere. United States. https://doi.org/10.1021/ef9002473
Duan, Lunbo, Zhao, Changsui, Zhou, Wu, Qu, Chengrui, and Chen, Xiaoping. 2009. "Investigation on coal pyrolysis in CO{sub 2} atmosphere". United States. https://doi.org/10.1021/ef9002473.
@article{osti_21233742,
title = {Investigation on coal pyrolysis in CO{sub 2} atmosphere},
author = {Duan, Lunbo and Zhao, Changsui and Zhou, Wu and Qu, Chengrui and Chen, Xiaoping},
abstractNote = {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.},
doi = {10.1021/ef9002473},
url = {https://www.osti.gov/biblio/21233742}, journal = {Energy and Fuels},
issn = {0887-0624},
number = 7,
volume = 23,
place = {United States},
year = {Wed Jul 15 00:00:00 EDT 2009},
month = {Wed Jul 15 00:00:00 EDT 2009}
}