A microscopic study of ash deposits in a two-stage entrained-bed coal gasifier
| Autor: | Koyama Shuntaro, Hideichi Matsuoka, Ueda Akio, Morimoto Tadaoki |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Wood gas generator
Chemistry business.industry General Chemical Engineering Organic Chemistry Metallurgy technology industry and agriculture Energy Engineering and Power Technology Sintering Slag medicine.disease_cause complex mixtures Soot Fuel Technology visual_art visual_art.visual_art_medium medicine Coal gasification Coal Char business Chemical composition |
| Zdroj: | Fuel. 75:459-465 |
| ISSN: | 0016-2361 |
| Popis: | Deposits adhering to the wall of a 50 t d−1 two-stage entrained-bed coal gasifier were analysed for morphology, structure, composition and sintering strength. Deposits were classified into three types: powder, lump, and fused slag. Of these, the powdery deposit consisted of melted ash particles, soot and char. Char considered as unmelted particles was produced at a lower oxygen/coal ratio. It served as a dispersive material in the deposit and prevented complete sintering even at high temperature. Because the two-stage gasifier operates with a lower oxygen/coal ratio at the gas exit zone and a higher oxygen/coal ratio at the molten slag exit zone, the slagging problem at the gas exit zone was decreased by the production of an adequate amount of char during gasification. |
| Databáze: | OpenAIRE |
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