Waste heat recycled
February 19th 2008 When budgeting a project to supply steam at 15 tonnes per hour it would not be unusual to plan spending of upwards of 500k for run and standby boilers, ancillary equipment and installation costs. Additionally fuel costs to run the plant for the just the first year could be up to £1m depending on the load pattern.
Faced with a similar project, Chris Payne of Wessex Incineration looked for a much more environmentally and financially sound solution. Their new processing plant had a steam requirement of 15 tonnes per hour at 10 bar g working pressure, but the existing plant was already producing heat which was dispersed to atmosphere.
Chris commissioned Byworth Boilers to design and manufacture a boiler to utilise this waste heat to satisfy the steam demand. As all waste heat applications are unique, this type of boiler has to be individually designed to achieve optimum performance. Byworth’s Chief Designer John Fox, designed a two pass boiler around 3 meters in diameter and with a working weight of almost 65 tonnes. Manufactured entirely in the Keighley factory the boiler is currently being installed in Frome, Somerset.
Operating purely on the waste heat from the existing process, no fuel is consumed, running costs are minimal (routine maintenance and negligible electricity), and the carbon footprint is said to be excellent. Waste heat boilers can be used in a range of situations where heat is an end product of a process. They are commonly used in combined heat and power projects, and are equally suitable for steam or hot water production.
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