| 摘要 |
PURPOSE:To prevent a decrease of exhaust gas temperature and prevent exhaust gas from freezing, by detecting the exhaust gas temperature of an expansion turbine and throttling a shut off valve in an inlet of the turbine stepwise. CONSTITUTION:A generator 2 is driven by an expansion turbine 1. A shut off valve 4 is interposed in an inlet gas pipe 3 of the expansion turbine 1. A thermometer 6 is provided in an exhaust gas pipe 5, and is detected temperature value T2 is input to an opening controller 7. If the detected temperature value T2 reaches a preset limit value, the shut off valve 4 is throttled stepwise to decrease pressure Pi before a turbine nozzle. In this way, freezing of exhaust gas caused by a decrease of temperature can be easily prevented. |
