Development of improved methods for the collection, transport control and utilisation of fines carbonaceous materials
In order to maximise the efficiency of the British Coal atmospheric pressure fluidised bed coal gasification process it is important to utilise the fine char elutriated from the gasifier. The most promising of three options for raising the coal to gas conversion in the gasifier used an inert bed material in place of char, and demonstrated that the elutriation of fine carbonaceous materials was reduced significantly. Work on the development of the inert bed option, however, showed that the bed material composition may have implications for the formation of agglomerates in the bed, particularly when limestone is added to the gasifier bed to reduce sulphur emissions. Work was therefore undertaken to explore the boundaries of operable gasifier conditions. The major factors which affect ash agglomeration were identified. Studies of process performance, operability of the gasifier and bed-ash interactions were carried out with a range of coals. Cold modelling studies were used to determine the effect of base cone design on particle mobility in the fluidised bed. A recycle system to investigate the effect of elevated system pressures on the recycling of fine char was developed. Depressurisation methods for transferring the fines to an atmospheric pressure combustor were also investigated.
Bibliographic Reference: EUR 14072 EN (1992) 46 pp., MF, ECU 4, blow-up copy ECU 7.50
Record Number: 199210603 / Last updated on: 1994-12-02
Original language: en
Available languages: en