The Rankine-cycle power plant comprises the evaporating member (12) for supplying the heat to evaporate the operational liquid present in this evaporating member (12) and for production of the steam of the operational liquid, also the turbogenerator (22) for the production of the electric energy with the help of the operational liquid, going out of the evaporating member (12) and introduced into the turbogenerator (22) through the incoming remedies of this operational liquid with removed heat for its condensation and for production of condensate, also the remedies for returning the condensate outgoing from the condensation member (24) into the evaporating member (12), also the filling tank (30) for the stock liquid, which has several fraction, also the feeding remedies for the feeding of the said liquid from the filling tank (30) into the power station (10), also the valve (V1) connected with the evaporating member (12) to remove the fractions from the liquid present in the evaporating member (12), the boiling point of which is higher than pre-determined value, and for feeding of the said fractions into the stock tank (32) of the evaporating member (12) to store these fractions in the liquid state, and finally the valve (V3), connected with the condensation member (24) for removing the fractions from the liquid in the condensation member (24), the boiling point of which is lower than pre-determined value, and for feeding of these fractions into the stock tank (34) of the condensation member (24) to store these fractions in the liquid state, whilst in the power station (10) then from the liquid, containing many fraction, remains as an operational liquid, the liquid containing the fractions with the middle boiling point.
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