Thermal power plant and method for control, regulation, and/or monitoring of a system including an expansion device

摘要

The method involves supplying a live steam (1) of a two-phase work medium i.e. organic working medium, to an expansion engine (2). The live steam is expanded in the expansion engine to form exhaust steams (5, 6), and a physical parameter of the exhaust steams is determined. A physical parameter of the live steam is determined on the basis of the determined physical parameter of the exhaust steams. A device e.g. component of steam power plant, is controlled or regulated and/or monitored on the basis of the determined physical parameter of the live steam. The physical parameter of the live steam is selected from temperature and/or enthalpy and/or entropy and/or volume ratios of gaseous to liquid phase and/or vapor content and/or a density ratio of gaseous to liquid phase of a live steam. An independent claim is also included for a thermal power plant comprising an expansion engine.