Turboden recently entered the UK market with awards for two biomass-fuelled combined cooling, heat and power (CCHP) plants for British Sky Broadcasting (BSkyB) and Heathrow Airport.
BSkyB is developing a 1MW CCHP plant as an integral part of its carbon-cutting emissions plans for its new studio, editing and transmission and data facility.
The main BSkyB campus in Hounslow, west London, will receive 32 tons of wood chips per day from local businesses within 25 miles of the facility. The wood products are burned at temperatures exceeding 1,000°C to heat thermal oil systems, which drive the 1MW ORC turbine. Lower-grade heat is then recovered to create chilled water for cooling and the remaining heat is used for hot water.
One of the key initial objectives of the ORC plant was to offset at least 20 per cent of the new facility’s CO2 emissions, but the plant has doubled this to 40 per cent since it was installed last December, according to Steve Holford, head of engineering projects and energy at BSkyB.
BAA Airports is installing Turboden’s biomass-fuelled CCHP ORC unit at London Heathrow. It will use wood waste to produce 1.8MW of electricity and 8MW of thermal heat and cooling to Terminal 2a and Terminal 2b and heat only to Terminal 5. Construction of the Heathrow plant is almost complete and start-up is expected by summer.
Turboden’s ORC technology is said to utilise heat from several sources including biomass, geothermal and concentrated solar power and by recovering heat from industrial processes, engines and gas turbines. The technology uses an organic fluid instead of steam to drive a turbo-generator, which can range in nominal output from about 1MW to 10MW and more.
The system employs a closed-cycle process that uses relatively low- to moderate-temperature heat sources to generate electricity. These ORC systems are driven by a simple evaporation process and are entirely enclosed, which means they produce virtually no emissions.