Fly ash formation behavior in pulverized coal combustion
Conference
·
OSTI ID:349083
- Idemitsu Kosan Co., Ltd. (Japan)
The investigation of ash formation behavior is essential to better understand the slagging and fouling phenomena in pulverized coal combustion. In particular, the distribution of fly ash size and chemical composition play a dominant role for the ash deposition properties at boiler wall. The objective of this study is to clarify the ash formation mechanism and to predict fly ash size and chemical composition changes during coal combustion. The transformations of mineral matter during pulverized coal combustion were tracked by CCSEM (Computer Controlled Scanning Electron Microscopy) analysis for several char samples collected in the course of combustion. It is indicated that the included minerals in coal mainly coalesced to form larger fly ash particles, while the fragmentation took place in the liberated minerals. The new method to predict the distribution of fly ash size and chemical composition at some combustion degree was developed using CCSEM data of feed coal. Calculated results gave good agreement with measurement data.
- OSTI ID:
- 349083
- Report Number(s):
- CONF-980985--; ISBN 1-890977-15-2
- Country of Publication:
- United States
- Language:
- English
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