Community Research and Development Information Service - CORDIS


Following reports of rapid corrosion of smoke tubes in underfeed stoker fired hot water boilers, an investigation has been carried out to identify and overcome the causes. Metallurgical examination confirmed acid dew point corrosion and the cause was identified as prolonged operation with low water temperatures. The method of controlling the boiler and the heating system it supplies was investigated and methods of overcoming this problem were determined.

Cause of corrosion of the retort screw assemblies in underfeed stokers was investigated and a cost-effective solution has been carried out. A system for protecting coal feed screws from fire damage due to burn back, and to provide an alarm on the occasion of shear pin failure has been developed and installed at two customer sites.

There are many underground boilerhouses where there is a need for a safe, low cost, and reliable method for removing ash. A prototype system, which has based around a low cost ash crusher and pneumatic conveyor, was installed at a local authority site in the UK. Early trials revealed problems with the conveying air filtration system. Modification of this unit led to satisfactory operation, although some wear on the ash crusher was still experienced. ed.

Additional information

Authors: BRITISH COAL CORPORATION, British Coal Corporation, Cheltenham (GB)
Bibliographic Reference: EUR 17380 EN (1997) 74pp., FS, ECU 11.50
Availability: Available from the (2)
ISBN: ISBN 92-826-7206-9
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