Formation Characteristics for Cocombustion of Rice Husk and Coal at High Temperature
Publication: Journal of Energy Engineering
Volume 148, Issue 1
Abstract
The cocombustion of biomass and coal has the potential to reduce emissions at high temperatures. In this study, an experimental investigation was conducted on a drop-tube furnace to investigate formation characteristics for cocombustion. The effects of temperature, blending ratio, and stoichiometric ratio on formation characteristics were explored. The results indicated that the addition of rice husks had a positive effect on reduction with stoichiometric ratios higher than 1 at temperatures of 1,400°C–1,600°C. Shallow air-staged combustion (stoichiometric ratio slightly lower than 1) effectively reduced formation when the blending ratio was 40%. Regardless of whether rice husk was blended or not, high-temperature air-staged combustion can maintain formation at a low level. When coal was blended with 40% rice husks in the thermal fraction, temperature had a slight effect on formation for the temperature range 1,400°C–1,600°C. The blending of coal and rice husks mainly reduced thermal formation and slightly reduced fuel formation at high temperatures with stoichiometric ratios higher than 1. This study proposed a possible mechanism for reduction by bending coal with rice husks. The reduction of was due to an increase in volatile matter, a reduction in group and biomass char, and a decrease in N content by blending in rice husks.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was financially supported by China Postdoctoral Science Foundation under Grant No. 2018M643643 and Shaanxi Provincial Natural Science Basic Research Program under Grant No. 2021JQ-045.
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Journal of Energy Engineering
Volume 148 • Issue 1 • February 2022
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© 2021 American Society of Civil Engineers.
History
Received: Jul 22, 2021
Accepted: Oct 9, 2021
Published online: Dec 7, 2021
Published in print: Feb 1, 2022
Discussion open until: May 7, 2022
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Cited by
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