Abstract
Intrinsic characteristics of Naomaohu coal pyrolysis in a two-stage fixed-bed reactor have been investigated in this study. The pyrolysates were detected by the simulated distillation, ultimate analysis and GC–MS to analyze the effect of different temperature chars on pyrolysis volatiles. The results showed that the slight secondary reactions occurred when the volatiles flowed through the 100–400 °C char layer, the yield of pyrolysis gas increased slightly, the tar yield had a little decrease, the atomic H/C ratio was higher than that of blank contrast experiment, and the quality of oil increased. Under the action of 500–900 °C char layer, the drastic secondary reactions of the volatiles occurred, the yield of pyrolysis gas increased obviously, and the yield and quality of oil decreased. The results of two-stage experiments with and without char effect were similar to the temperature change, indicating that temperature played a major role in affecting the distribution of pyrolysates. Whereas char was beneficial for the content and quality of light oil in the low-temperature range, the process of volatiles through the semi-coke layer enhanced H2 and CH4 yield during the total temperature range. Char also had an adsorption action, which gradually weakened with the temperature increased.
Similar content being viewed by others
References
Zhang L, Shen Q, Wang M, Sun N, Wei W, Lei Y, et al. Driving factors and predictions of CO2 emission in China’s coal chemical industry. J Clean Prod. 2019;210:1131–40.
Wang JG, Zhao XH. Demonstration of key technologies for clean and efficient utilization of low-rank coal. Bull Chin Acad Sci. 2012;27:382–8.
Zhang JW, Wang Y, Dong L, Gao SQ, Xu GW. Decoupling gasification: approach principle and technology justification. Energy Fuels. 2010;24:6223–32.
Kan T, Sun XY, Wang HY, Li CS, Muhammad U. Production of gasoline and diesel from coal tar via its catalytic hydrogenation in serial fixed beds. Energy Fuels. 2012;26:3604–11.
Kopyscinski J, Schildhauer TJ, Biollaz SMA. Production of synthetic natural gas (SNG) from coal and dry biomass: a technology review from 1950 to 2009. Fuel. 2010;89:1763–83.
Xu SP, Zeng X, Han ZN, Cheng JG, Wu RC, Chen ZH, et al. Quick pyrolysis of a massive coal sample via rapid infrared heating. Appl Energy. 2019;242:732–40.
Wilkins RWT, George SC. Coal as a source rock for oil: a review. Int J Coal Geol. 2002;50:317–61.
Borah RC, Ghosh P, Rao PG. A review on devolatilization of coal in fluidized bed. Int J Energy Res. 2011;35:929–63.
Zhang C, Wu RC, Xu GW. Coal pyrolysis for high-quality tar in a fixed-bed pyrolyzer enhanced with internals. Energy Fuels. 2014;28:236–44.
Zhang C, Wu RC, Hu EF, Liu SY, Xu GW. Coal pyrolysis for high-quality tar and gas in 100 kg fixed bed enhanced with internals. Energy Fuels. 2014;28:7294–302.
Xu S, Lai D, Zeng X, Zhang L, Han Z, Cheng J, et al. Pyrolysis characteristics of waste tire particles in fixed-bed reactor with internals. Carbon Resour Convers. 2018;1:228–37.
Xu WC, Tomita A. The Effects of temperature and residence time on the secondary reactions of volatiles from coal pyrolysis. Fuel Process Technol. 1989;21:25–37.
Doolan KR, Mackie JC, Tyler RJ. Coal flash pyrolysis: secondary cracking of tar vapors in the range 870-2000 K. Fuel. 1987;66:572–8.
Gibbinsmatham J, Kandiyoti R. Coal pyrolysis yields from fast and slow heating in a wire-mesh apparatus with a gas sweep. Energy Fuels. 1988;2:505–11.
Serio MA, Peters WA, Howard JB. Kinetics of vapor-phase secondary reactions of prompt coal pyrolysis tars. Ind Eng Chem Res. 1987;26:1831–8.
Zhang K, Li Y, Wang ZH, Li Q, Whiddon R, He Y, et al. Pyrolysis behavior of a typical Chinese sub-bituminous Zhundong coal from moderate to high temperatures. Fuel. 2016;185:701–8.
Jin LJ, Bai XY, Li Y, Dong C, Hu HQ, Li X. In-situ catalytic upgrading of coal pyrolysis tar on carbon-based catalyst in a fixed-bed reactor. Fuel Process Technol. 2016;147:41–6.
Zhu P, Luo A, Zhang F, Lei Z, Zhang J, Zhang J. Effects of extractable compounds on the structure and pyrolysis behaviours of two Xinjiang coal. J Anal Appl Pyrol. 2018;133:128–35.
Zhang Y, Han ZN, Wu H, Lai DG, Glarborg P, Xu GW. Interactive matching between the temperature profile and secondary reactions of oil shale pyrolysis. Energy Fuels. 2016;30:2865–73.
Arenillas A, Rubiera F, Pis JJ. Simultaneous thermogravimetric-mass spectrometric study on the pyrolysis behaviour of different rank coals. J Anal Appl Pyrol. 1999;50:31–46.
Cheng S, Lai DG, Shi Z, Hong LS, Zhang JL, Zeng X, et al. Suppressing secondary reactions of coal pyrolysis by reducing pressure and mounting internals in fixed-bed reactor. Chin J Chem Eng. 2017;25:507–15.
Liang X, Lyu J, Shu X. Underground catalytic pyrolysis reaction characteristics of long flame coal from Naomaohu in Xinjiang. Coal Convers. 2017;40:28–33.
Wu D, Zhang W, Fu B, Hu G. Chemical structure and gas products of different rank coals during pyrolysis. J Therm Anal Calorim. 2019;136:2017–31.
Zhan J-H, Wu R, Liu X, Gao S, Xu G. Preliminary understanding of initial reaction process for subbituminous coal pyrolysis with molecular dynamics simulation. Fuel. 2014;134:283–92.
Xian S, Zhang H, Chai Z, Zhu Z. Release characteristics of gaseous products during CO2 gasification of char. J Therm Anal Calorim. 2020;140:177–87.
Porada S. The influence of elevated pressure on the kinetics of evolution of selected gaseous products during coal pyrolysis. Fuel. 2004;83:1071–8.
Lai D, Zhan J-H, Tian Y, Gao S, Xu G. Mechanism of kerogen pyrolysis in terms of chemical structure transformation. Fuel. 2017;199:504–11.
Hayashi J, Nakagawa K, Kusakabe K, Morooka S, Yumura M. Change in molecular-structure of flash pyrolysis tar by secondary reaction in a fluidized-bed reactor. Fuel Process Technol. 1992;30:237–48.
Khan MR. A literature survey and an experimental-study of coal devolatilization at mild and severe conditions: influences of heating rate, temperature, and reactor type on products yield and composition. Fuel. 1989;68:1522–31.
Yu LE, Hildemann LM, Niksa S. Trends in aromatic ring number distributions of coal tars during secondary pyrolysis. Energy Fuels. 1998;12:450–6.
Arenillas A, Rubiera F, Pis JJ, Cuesta MJ, Iglesias MJ, Jimenez A, et al. Thermal behaviour during the pyrolysis of low rank perhydrous coals. J Anal Appl Pyrol. 2003;68–9:371–85.
Higman C, van der Burgt M. Gasification. 2nd ed. Burlington: Gulf Professional Publishing; 2008.
Acknowledgements
The authors are grateful for financial support from the National Natural Science Foundation of China (No. 21875255), Heilongjiang Education Department Project (1354ZD001) and MuDanjiang Normal University National Project Cultivation Project (GP2018002).
Author information
Authors and Affiliations
Corresponding authors
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Liu, Z., Zhan, JH., Lai, D. et al. Effects of different temperature chars on distribution of pyrolysates for Naomaohu coal. J Therm Anal Calorim 146, 287–296 (2021). https://doi.org/10.1007/s10973-020-09934-y
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10973-020-09934-y