| 摘要 |
PCT No. PCT/FI92/00204 Sec. 371 Date Jan. 11, 1994 Sec. 102(e) Date Jan. 11, 1994 PCT Filed Jul. 1, 1992 PCT Pub. No. WO93/01397 PCT Pub. Date Jan. 21, 1993A method is provided for improving the efficiency of a small-size power plant based on an ORC process. The plant comprises at least one energy converter unit, with a power range below 500 kW, and at least one burner for combustion of fuel for producing energy for the energy converter unit. The energy converter unit includes a high-speed machine which comprises first and second turbines and a generator mounted on a common rotor having rotational speed exceeding 8000 rpm. An ORC medium is vaporized in a vaporizer by utilizing energy derived from the combustion of the fuel in the burner, and then expanded in the first turbine of the high-speed machine to produce electric energy. The ORC medium leaving the first turbine is then reheated by a superheater of the vaporizer utilizing energy derived from the combustion of the fuel in the burner. The reheated ORC medium is expanded in the second turbine of the high-speed machine to produce electric energy and led the second turbine a cooling arrangement for condensing the same. The method also includes leading the fluid ORC medium to the vaporizer in the first step through a pre-heater forming a part of the cooling arrangement where it is preheated by the ORC medium coming from the second turbine of the high-speed machine.
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