METHOD FOR OPTIMALLY OPERATING CO-GENERATION OF ELECTRICITY AND HEAT AND OPTIMALLY OPERATING DISTRICT HEATING POWER PLANT

摘要

A method for optimally operating co-generation of electricity and heat in which the district heating power range is divided to a lower range and a higher range is characterized in that: base load electricity and regulation electricity are produced with a steam turbine operating like a condensing turbine; the lower heating power range (B) is produced mainly by heat pumps using the energy of the exhaust steam of the turbine as an energy source; pe ak- load power and wintertime regulation electricity are produced with a peak-lo ad engine; and the higher heating power range (A3, A4) is produced partially by heat pumps using said energy as the energy source and partially by the exhau st gas heat of said peak-load engine. Both the elctricity and the heat are produced with a remarkably higher fuel utilization rate and significantly mo re electricity in relation to heat is produced than with conventional district heating power plants. The invention concerns also an optimally operating district heating power plant realizing the above method. At the initial stag e of the operation of the district heating power plant, the district heating load being partial, a bigger amount of electricity may be produced of a fuel unit than at the final stage of the operation with a full district heating load. Extra peak power at short notice may be produced with the peak-load engine with a better fuel utilization rate than with the previously known solutions.