JP Journal of Heat and Mass Transfer
Volume 11, Issue 2, Pages 215 - 227
(May 2015) http://dx.doi.org/10.17654/JPHMTMay2015_215_227 |
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GASIFICATION OF BROWN COAL USING A 915MHz PURE STEAM PLASMA TORCH
Dong Hun Shin, Chang Hyun Cho, Jin Young Huh, Yong Cheol Hong, Young Hoon Lee and Young Ki Park
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Abstract: This study investigated the gasification of low-grade coal in an atmospheric-pressure pure steam plasma torch operating at 915MHz microwave. Because it contains a highly active chemical species, a steam plasma torch enhances chemical reaction rates. The fine powder brown coal (average particle size of 70μm) from Indonesia that was used in the experiment was delivered into the torch through a feeder. Two 915MHz microwave system sets were mounted on the upper and lower sections of the gasifier. Upper and lower plasma torches were installed so as to be tangential to the cylindrical gasifier sidewall. A swirl flow from the upper to the lower section occurred, generating longer particle residence than would occur in a gas stream. At rates of 60kg/hr and 30kg/hr, brown coal particles were injected into the upper and lower section plasma torches at microwave power of 40kW and 30kW, respectively. The relative concentrations of the synthesized gases were 36.3% hydrogen, 26.5% carbon monoxide, and 23.3% carbon dioxide. Cold gas efficiency and carbon conversion rates were observed to be 66.1% and 88.9% with 1450°C of average temperature, respectively. |
Keywords and phrases: steam plasma, coal gasification, 915MHz microwave, low-grade coal. |
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