Ash Liberation from Included Minerals during Combustion of Pulverized Coal: The Relationship with Char Structure and Burnout
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- 作者：Hongwei Wu ; Terry Wall ; Guisu Liu ; and Gary Bryant
- 刊名：Energy & Fuels
- 出版年：1999
- 出版时间：November 1999
- 年：1999
- 卷：13
- 期：6
- 页码：1197 - 1202
- 全文大小：144K
- 年卷期：v.13,no.6(November 1999)
- ISSN：1520-5029
文摘
In this study, the float fraction (<specific gravity of 2.0) of a size cut (63-90 
m) bituminouscoal was combusted in a drop tube furnace (DTF) at a gas temperature of 1300 
C under anatmosphere of air, to investigate the ash liberation at five coal burnoff levels (35.5%, 54.3%, 70.1%,87.1%, and 95.6%). The data indicated that char structure determines the ash liberation atdifferent burnoff levels. Fragmentation of porous char was found to be the determinativemechanism for formation of fine ash during the early and middle stages of char combustion,while coalescence of included mineral matter determines the coarse ash formed in the later stagesof combustion. The investigation confirmed that the char morphology and structure play a keyrole in determining char fragmentation, char burnout history, and the ash liberation duringcombustion.
m) bituminouscoal was combusted in a drop tube furnace (DTF) at a gas temperature of 1300 C under anatmosphere of air, to investigate the ash liberation at five coal burnoff levels (35.5%, 54.3%, 70.1%,87.1%, and 95.6%). The data indicated that char structure determines the ash liberation atdifferent burnoff levels. Fragmentation of porous char was found to be the determinativemechanism for formation of fine ash during the early and middle stages of char combustion,while coalescence of included mineral matter determines the coarse ash formed in the later stagesof combustion. The investigation confirmed that the char morphology and structure play a keyrole in determining char fragmentation, char burnout history, and the ash liberation duringcombustion.