Rendering smells sweet with incinerator
22 Aug 2000
Seeking to comply with tough new regulations on odour abatement, Babcock Wanson has installed a thermal destructor rendering system at one of the UK's largest rendering contractors. This is the Hertfordshire-based firm's first such plant in the UK, although it has previously installed 17 such units around Europe.
The new regulations, which came into force in January, require odour streams from rendering processes to be kept separate and treated by `appropriate treatment plant which has been suitably designed to deal with specific types of odour'. High-intensity odours, and streams containing non-condensable gases, should be treated by incineration, the guidelines state.
The Babcock Wanson unit is a recuperative system, which reuses the heat from the furnace to generate steam and can run on a variety of fuels. The system can use recovered tallow as a primary fuel, burning both condensable and non-condensable gases, and ejecting the hot stream out to the waste heat recovery boiler. The system can also incorporate a pre-heating unit, which heats air from elsewhere in the rendering plant that contains low-intensity odours. This hot air is then used as the primary combustion air for the burners.
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