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22 April 2004 - Kawasaki Heavy Industries Ltd. has developed a small-scale cogeneration system that uses scrap wood to generate electricity with a high efficiency of 20 per cent and starts up in a quick 30 minutes.
The company will market the system in sizes that process some 1 to 5 tons of scrap wood per day to local municipalities and sawmills. A standard system that outputs 80 kilowatts will be priced at around 60-80m yen ($548 000-$731 000).
In the system, scrap wood is thermally decomposed by exposure to high heat in a gasification furnace. Tar and other impurities are removed, leaving carbon monoxide, hydrogen and other burnable gasses. These are used by a gas engine to generate electricity, and waste heat is recovered for the boiler or used for climate-control purposes. The entire system is operated at an internal pressure that is lower than atmospheric pressure, which helps prevent the escape of gases.
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