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A new gas-engine cogeneration system

By Gerald Ondrey |

Last month, Mitsubishi Heavy Industries, Ltd. (MHI; www.mhi.co.jp) and Tokyo Gas Co. (both Tokyo, Japan; www.tokyo-gas.co.jop) began marketing a jointly developed 1,000-kW gas-engine cogeneration system. Based on the conventional 930-kW system, the new systems engine operates at a reduced speed (1,000 rpm instead of 1,500 rpm), so the wear-rate of components is reduced. This leads to a reduction of the overall maintenance costs by 30%, says MHI. The engine is able to generate a higher output at lower speeds because its piston stroke has been extended by approximately 20% compared to the conventional system. Also, the use of a highly efficient turbocharger has increased the amount of compressed fuel-air mixture supplied into the cylinders, which raises the mean effective pressure by 30% from the conventional system. The new system also features an upgraded engine-control unit that leads to a generating efficiency of 42.3%, which is said to be the highest level in the 1,000-kW class. The thermal efficiency has also been improved by upgrading the one-stage intercooler used on the conventional system to a two-stage intercooler system (diagram) to achieve an overall efficiency of 78.5%. The combination of reduced maintenance costs and…
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