HEAT POWER PLANT OPERATION MODE Russian patent published in 2015 - IPC F01K17/02 F01K13/02 F01K25/08 

FIELD: power industry.

SUBSTANCE: invention relates to power engineering and can be used for recovery of heat of heat power plants (HPP). The supply of heating performance steam from the steam turbine extractions into the steam space of the top and lower system heaters, supply of system water from consumers along the return system water pipeline into the heat exchanger cooler of system water and into the lower, and upper system heaters, supply of system water into the system water supply pipeline, pumping of the spent steam from the steam turbine into steam space of the condenser where steam is condensed on the surface of condenser tubes are performed. Condensate by means of the condensate pump of the steam turbine condenser is pumped to the regeneration system. In the heat power plant the condensation unit is used which has the steam turbine condenser with production steam extraction and the oil supply system with the oil cooler for lubrication of steam turbine bearings. The utilisation of low-grade heat of the oil supply system of the steam turbine bearings with production steam withdrawal, utilisation of high-grade heat of production steam withdrawal and utilisation of excess low-grade heat of the return network water using the heat engine with the closed circulation circuit, operating according to Rankine organic cycle, are performed. In Rankine cycle the cooling liquid is the low-boiling working body circulating in the closed circuit. The low-boiling working body is compressed in the condensate pump of the heat engine, heated in the oil cooler and in the heat exchanger cooler of system water, evaporated and overheated in the steam turbine condenser with production steam extraction, expanded in the turbine expander of the heat engine and condensed in the heat exchanger condenser of the heat engine. In special cases of the invention implementation the heat exchanger condenser of the heat engine is an air cooling condenser, a water cooling condenser, or an air and water cooling condenser. The low-boiling working body is the liquefied propane C₃H₈.

EFFECT: increase of efficiency of heat power plant due to utilisation of excess low-grade heat of the return system water for additional electric power generation.

3 cl, 1 dwg, 1 ex