The role of coal minerals in conversion processes
The objectives of this project have been to improve understanding of the role of coal minerals in combustion processes, so that for given combustion conditions and known mineral composition, the likely amounts of deposits can be predicted and appropriate remedial measures taken. Sixteen UK bituminous coals with varied mineral composition and behaviour when burnt in industrial boiler plant were selected for the study. Their mineral composition was analysed, and the coals burnt in a laboratory scale fluidised bed and a 9 kW domestic underfeed stoker in order to simulate different combustion regimes. The combustion products were then analysed for mineral content. Deposits and ashes from industrial scale boilers which had burnt similar coals were also collected and characterised, for comparison with the laboratory studies. Kaolinite was found to retain sodium in a form which would not contribute to deposit build up. In general, the proportion of kaolinite increases as coal ash contents increase, so that cleaning coal to lower ash content could worsen its fouling characteristics. Sodium, calcium and magnesium were found to exert an adverse effect on fouling.
Bibliographic Reference: EUR 14070 EN (1992) 194 pp., MF, ECU 8, blow-up copy ECU 30
Record Number: 199210595 / Last updated on: 1994-12-02
Original language: en
Available languages: en