Ash deposition behavior on a gasifier wall of 200t/D PDU of IGCC
Understanding and controlling high temperature behavior of mineral maters in coal are important issues for developing novel coal utilization processes. Characterization of deposited ash and recycle char sampled from the 200 t/day IGCC PDU unit operated at Nakoso, Ibaraki, Japan, was performed. The gasifier was air-blown and operated at 27 ata. It consisted of two parts, combustor and reductor where air and coal were injected. Deposited ash was collected just above the reductor burners after finishing the operation. Mainly, Japanese Taiheiyo coal was used as fuel and limestone was introduced as flux. XRD, FE-SEM, CC-SEM were used for characterization. From the results of XRD and CC-SEM measurements for raw Taiheiyo coal, recycle char and deposited ash, it was found that most of particles containing anorthite and anorthite-like compounds were trapped on the gasifier wall as deposits along with ash particles which reacted with limestone. In recycle char, quartz was mainly observed, and anorthite and calcite were hardly observed. Therefore, it was concluded that ash deposition is very selective phenomenon.
- Research Organization:
- Waseda Univ., Tokyo (JP)
- OSTI ID:
- 20082271
- Country of Publication:
- United States
- Language:
- English
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