CIRCUIT ARRANGEMENT FOR STEAM GENERATORS TO RECOVER LOW-POTENTIAL HEAT OF STACK GASES Russian patent published in 1999 - IPC

FIELD: thermal engineering. SUBSTANCE: circuit includes air heater 21 placed between fan 22 and steam generator 17, convection stage 13 providing communication between deaerator 14 and condensate pump 7 by means of condensate pipeline 16 through makeup condenser 8, and also two similar parallel auxiliary circuits of series-connected condenser 8, vacuum pump 9, evaporation stage 26 whose blowdown pump 6 ensures drain to sludge tank 2, and condenser stage 27 which connect, respectively, raw water pipeline 28 to distillate pipeline 1 for make-up of steam generator 17 and to secondary steam line 11 downstream of vacuum pump 9 introduced in deaerator 14, and also process water pipeline 33 to distillate line 1; gas line of steam generator 17 communicates with draft fan 25 through parallel-connected air heater 21, convection stage 13, evaporation stage 26, and through respective condensing stages 26; condensate pumps 7 are connected to raw water pipeline 28 and process water line 23; circulating water pump 29 downstream of turbine condenser 19 is included in addition in parallel with makeup condenser 8 and recovery condenser 3. EFFECT: improved efficiency of reuse of low-potential heat of stack gases. 1 dwg