Dargavel energy from waste plant nears production 19 March 2010

A project to convert domestic and industrial waste into energy, being commissioned at Dargavel, Dumfries, is using BOS (batch oxidation system) technology developed by Manchester-based Ascot Environmental.

Operated by ScotGen, the plant uses hazardous and non-hazardous waste to provide power and heat, while also managing residual wastes usually destined for landfill.

Lloyd Brotherton, project director at Ascot Environmental, says its design offers a commercially viable non-landfill alternative for 60,000 tonnes of waste per annum. It should be capable of dealing with waste from a town or city with a population of 250,000.

The plant, operating 24 hours per day, 365 days per year, will generate 6.2MW of electrical power for the National Grid. Heat produced from the gasification process will also be used by local industries.

Part of the plant's thermal treatment process employs compressed air, supplied from two network-linked Atlas Copco GA37+ 8bar oil-injected rotary screw compressors, with integrated air treatment and downstream filtration.
The air plant has also been specified with an OSC600 oil/water condensate separator, an EWD 330 electronic condensate drain, a 3,000 litre air receiver, plus an ES4i integrated sequence controller.

The system supplies all plant and instrument air, with its main application being on flue gas filtration, cleaning filtration bags.

Air is also supplied to the CEMS (continuous emission monitoring system) to ensure that emissions meet environmental requirements.

Brian Tinham

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