FIELD: power engineering.
SUBSTANCE: invention relates to the field of power engineering and can be used in units for producing heat and electric energy. System (200, 300) for joint production of heat and electric energy comprises a boiler (201, 301) configured to heat water for domestic needs, a combustion chamber (201A, 301a) for liquid or gaseous fuel, located in said boiler (201, 301), wherefrom flue gases exit, a compressor (204, 304) for gaseous fluid medium, a heat exchanger (202, 302) configured to exchange energy between the flue gases formed in the combustion chamber (201A, 301a) and the fluid medium exiting the compressor (204, 304), a gas turbine (203, 303) whereto the compressed and heated fluid medium is supplied from the heat exchanger (202, 302), a current generator (205, 305) and a current converter (206, 306), connected with the gas turbine (203, 303) and configured to generate electric energy, a primary heat exchanger (207, 307) with transfer of heat from the flue gases to the water, located behind said heat exchanger (202, 302) and configured to recover heat energy between the flue gases formed in the combustion chamber (201A, 301a) and the water, and a bypass valve (210, 310) located before the turbine (203, 303) and configured to adjust the flow rate of part of the fluid medium supplied to the gas turbine (203, 303) and redirect the remaining fluid medium, wherein the system comprises an additional heat exchanger (209, 309) configured to recover of the remaining heat energy of said part of the fluid medium exiting the turbine (203, 303) and the remaining flow of the fluid medium redirected by the bypass valve (210, 310), and preheat the water supplied to the primary heat exchanger (207, 307).
EFFECT: increase in the operating efficiency of the system.
3 cl, 2 dwg
