Community Research and Development Information Service - CORDIS


This project addresses the removal of ash from industrial boilers. Two types of wet system have been evaluated: (a) hydraulic conveying of ash within closed pipelines using water as the conveying medium; (b) a chain and disc conveyor which transports ash mechanically through water contained within a tube. Ash from industrial boilers falls into two broad categories; large (or stoker) ash, and fine ash produced predominantly from fluidised bed combustors. Two techniques have therefore been developed to suit the respective type of ash. Investigations have been made into the design and development of suitable entrainment devices for fine ash hydraulic systems, and units capable of handling material reliably at flow rates of up to 600 kg/h have been demonstrated. The suitability of this type of entrainment device for use commercially at a brickworks has been assessed. Dewatering of the material has also been demonstrated successfully using a rotary vacuum drum filter. A full-scale test rig to convey stoker ash has been designed and installed on a test site. Findings from these tests have been used in a similar demonstration system which has been installed at a hospital boilerhouse. A chain and disc conveyor has been assessed for use with wet ash. A unit has been installed on a hospital site to replace an unreliable pneumatic conveying system, and operation of the plant continues to be monitored.

Additional information

Authors: BRITISH COAL CORPORATION, Coal Research Establishment, Cheltenham (GB)
Bibliographic Reference: EUR 14066 EN (1992) 32 pp., MF, ECU 4, blow-up copy ECU 6
Availability: (2)
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