Secondary Catalytic Reaction of Circulating Ash on the Primary Volatiles of Coal Pyrolysis
Publication: Journal of Energy Engineering
Volume 143, Issue 5
Abstract
In view of the polygeneration technology of coal pyrolysis/circulating fluidized bed combustion, circulating ash and coal were layered in the pyrolysis reactor to investigate the secondary catalytic reaction of circulating ash on the primary volatiles of coal pyrolysis. The influence factors of the location types of ash and coal, the mass ratio of ash to coal, ash composition, and ash particle size were studied. Increasing the mass ratio of ash to coal increases the number of the catalytic active sites. Circulating ash rich in significantly promotes the increase of gas product yield and the decrease of liquid product yield. Circulating ash increases the yields of and but decreases the yield significantly. The yields of and for Zhaotong brown coal increase more than Shenmu bituminous coal. Combined with the thermogravimetric analyzer–mass spectrometer, the secondary catalytic effect of circulating ash on the primary volatiles of coal pyrolysis is evidenced mainly in the promotion of hydrocracking reaction of large molecular hydrocarbons. This study may provide reference for the optimization of the industrial scale of coal pyrolysis by solid heat carrier.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 21376142).
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Information & Authors
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Published In
Journal of Energy Engineering
Volume 143 • Issue 5 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 11, 2016
Accepted: Jan 17, 2017
Published online: Mar 25, 2017
Discussion open until: Aug 25, 2017
Published in print: Oct 1, 2017
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