An evaluation of the effects of high system pressure on the performance of pneumatic coal conveyors
- CRE Group Ltd., Gloucestershire (United Kingdom)
- Coal Technology Development Division, Gloucestershire (United Kingdom); and others
The Air Blown Gasification Cycle(ABGC), formerly known as the British Coal Topping Cycle, is based on the partial gasification of coal in an air blown spouted bed at elevated pressures of typically 25 barg and temperatures of up to 1050{degrees}C. A sorbent, such as limestone, is also injected into the gasifier to retain most of the sulphur which would otherwise be released into the fuel gas. Between 70 and 80% of the coal substance is converted to a low calorific value gas. This fuel gas, after cooling and cleaning is burnt to produce a gas at high temperature and pressure which is expanded through a gas turbine. The solid residue from the gasifier, containing a mixture of mineral matter, char and sulphided sorbent residue, exits the gasifier in two main streams; as a coarse solid from the base of the gasifier and as a fine material elutriated from the gasifier bed and captured in a hot cyclone and a high efficiency ceramic barrier filter. Both solid residue streams are depressurised, cooled and burnt in a circulating fluidised bed combustion boiler, thereby raising steam which is used to generate further power in a steam turbine. An outline diagram of the cycle is shown. A cycle efficiency approaching 50% is achievable with ABGC. In the UK, a collaborative research and development programme, including GEC Ahlstom, PowerGen, Babcock Energy Ltd, Coal Technology Development Division and the UK Government Department of Trade and Industry, has been established to provide the basis for the demonstration of this technology. As part of this initiative, an R&D programme has been put into place to establish and address the issues associated with the storage and feeding of fuels to the ABGC gasifier at elevated pressures and the depressurisation of the solid off-take streams. The focal point of these activities is the recently formed Coal Technology Development Division (CTDD), arising form part of the Coal Research Establishment of the British Coal Corporation.
- Research Organization:
- Coal and Slurry Technology Association, Washington, DC (United States); USDOE Pittsburgh Energy Technology Center (PETC), PA (United States)
- OSTI ID:
- 171603
- Report Number(s):
- CONF-950313-; ON: TI96120235; TRN: 95:007972-0033
- Resource Relation:
- Conference: 20. international technical conference on coal utilization and fuels systems, Clearwater, FL (United States), 20-23 Mar 1995; Other Information: PBD: 1995; Related Information: Is Part Of Coal utilization and fuel systems: Proceedings; PB: 780 p.
- Country of Publication:
- United States
- Language:
- English
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