| 摘要 |
<p>Power plant for burning a fuel at a pressure exceeding atmospheric pressure, in particular a PFBC power plant with a bed vessel enclosed in a pressure vessel. Valves (90;96;98) in a hot gas pipe (60) between the bed vessel and a turbine, in an air duct (64) between a compressor and the bed vessel, and in a short-circuit connection (76,85) between said ducts are constructed as a single mechanical valve unit (58). Between a valve housing (66) and a cylinder (72) arranged centrally therein and provided with a valve (90), said cylinder providing passage for gas to the turbine (21), is a preferably annular channel (82,84) for compressed air from the compressor, having two or more valves (96) arranged in parallel. Between this annular channel (82,84) and the cylinder (72) is provided a connection (76,85) with two or more valves (98). The valves (96) in the air duct and the valves (98) in the connection to the cylinder (72) have valve discs (96b,98b) arranged on a common rod (100). The valve (98) in the air duct can function as a non-return valve should the operating device (106) of one of the valves (96,98) fail to operate.</p> |
