Medium-pressure power boiler developed

January 30th, 2015, Published in Articles: Energize


John Thompson has developed the MicroGen watertube boiler to cater for the growing demand for a small, medium-pressure, power boiler particularly suited to fibrous-biomass fuel and coal-fired, cogeneration applications. The boiler has been designed for a steam output of between 20 and 25 t/h dependent upon fuel type. Higher outputs can be achieved with multiple boilers. In order to match popular steam turbine selections that can achieve good cycle efficiencies at reasonable cost, the boiler can produce steam at pressures between 31 and 61 bar. The design incorporates a single-drum configuration with a membrane-wall furnace construction. The boiler is configured to facilitate manufacture of the pressure-parts in large subassemblies which can be containerised for transportation. The furnace design incorporates; a continuous ash discharge stoker, a suitably proportioned furnace and pneumatic fuel spreaders. The boiler will be supplied with a heat recovery tower which includes a tubular air-heater and an extended-surface economiser. Flue-gas clean-up equipment is supplied to suit the site and/or customer specific requirements.

Contact Carey-Ann Kondo, ACTOM John Thompson, Tel 021 021 959-8478,

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