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A survey of coal based gasification technologies was carried out. As a result of feasibility and economic studies on a range of concepts, a scheme based on a modified version of the twin-bed combustor/pyrolyser was identified as an appropriate technology. Preliminary test work on the system indicated that up to 20 % of the coal feed was elutriated as char. To reduce the carbon and dust content of the outlet gas stream while maintaining the capital cost of the boiler/furnace at an acceptable level, a scheme was devised to separate the solids from the combustible gas stream, (using an in-duct cyclone) and to complete burnout in a cyclone combustor located in the oxidant gas stream. Based on these studies a full-scale hot cyclone system was designed, manufactured and installed into the mixing chamber of an existing twin-bed furnace test facility. At first the extent of hot test work was limited to an assessment of the combustion performance. Subsequent testwork, however, showed that the combustion efficiency of the process was increased from 95 % to in excess of 98 % at maximum furnace output. The coal/gas conversion efficiency of the pyrolyser was increased from 45 % to 52 %.

Additional information

Authors: BRITISH COAL CORPORATION, British Coal Corporation, Coal Research Establishment, Cheltenham (GB)
Bibliographic Reference: EUR 14312 EN (1993) 79 pp., MF, ECU 4
Availability: (2)
Record Number: 199310535 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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