| 摘要 |
1. Method of changing the output of electrical energy of a combined heat and power station without affecting the heat output to connected heat consumers, in which method the electrical energy is generated in at least one electrical generator (34) driven by at least one back-pressure steam turbine (14) and the heat output takes place by means of at least one heating water heat exchanger (26) heated by back-pressure steam, which heating water heat exchanger is connected to at least one heat consumer by means of at least one heating supply main (54) and one heating return main (56), characterized in that, in order to reduce the electrical energy output, the compressor (40, 401) of a heat pump (42) is driven by at least a part of the energy generated by the use of the steam turbine (14), heating return water previously stored is cooled to below the heating water return temperature by the heat pump (42) and stored as cold water, the heat energy gained during the cooling being supplied to the heating water, and that in order to increase the electrical energy output, the whole of the energy generated in the steam turbine (14) is supplied to the consumers converted into electrical energy and, simultaneously, the temperature of the heating return water is reduced by the cold water to below the heating return temperature before the heating return water enters the heating water heat exchanger (26) and that in both operating conditions, the steam supplied to the steam turbine (14) is controlled in such a way that the heat output to the heat consumers is maintained at the desired level. |
