Waste heat steam generating cycle

Abstract

Abstract A WASTE HEAT POWER RECOVERY CYCLE IS DESCRIBED WHICH CONVERTS TO SHAFT WORK A LARGER PORTION OF THE HEAT AVAILABLE FROM A GIVEN SOURCE OF WASTE HEAT THAN DOES AN ORDNARY FRANKIE CYCLE. THE RECOVERY CYCLE IS PARTICULARLY ILLUSTRATED AS APPLIED TO THE WASTE HEAT CONTAINED IN THE EXHAUST GASES OF A BRAYTON CYCLE COMBUSTION GAS TURBINE. THE EXHAUSE GASES, AVAILABLE USUALLY AT ABOUT 850* F., HEAT 1500 P.S.I.A. PRESSURIZED WATER TO ABOUT 596* F . THE HOT PRESSURIZED WATER IS THEN INTRODUCED INTO ONE OF A PLURALITY OF WATER RECEIVERS IN WHICH IT IS PERMITTED TO FLASH AT GRADUALLY DECREASING PRESSURES. THE RESULTING FLASH STEAM IS SUPERHEATED TO ABOUT 800* F. BY THE 850* F. EXHAUST GASES, AND INTRODUCED INTO THE STEAM CHEST OF A MULTIPLE NOZZLE STEAM TURBINE, THE NUMBER OF NOZZLES PASSING STEAM IS GRADUALLY INCREASED AS THE STEAM PRESSURE DROPS SO AS TO KEEP POWER PRODUCTION SUBSTANTIALLY CONSTANT. WHEN THE STEAM PRESSURE HAS DROPPED A PREDETERMINED AMOUNT, THE UNFLASHED WATER IS TRANSFERRED TO ANOTHER RECEIVER AND IS PERNITTED FLASH DOWH TO A LOWER PRESSURE. THIS FLASH STEAM IS SIMILARLY SUPERHEATED AND IS INTRODUCED INTO THE STEAM CHEST OF A SIMILAR MULTIPLE NOZZLE INTERMEDIATE PRESSURE TURBINE. THE WATER IS FINALLY INTRODUCED INTO LOW PRESSURE WATER RECEIVE WHERE IT IS FLASHED TO ABOUT CONDENSING PRESSURE, THE FLASH STEAM IS AGAIN SUPERHEATED, AND EXPANDED THROUGH A MULTIPLE NOZZLE LOW PRESSURE TURBINE TO THE CONDENSER THE RESIDUAL WATER AND CONDENSATE ARE THEN JOINED, AND PUMPED AT HIGH PRESSURE TO BE HEATED AGAIN BY THE EXHAUST GASES AS DESCRIBED ABOVE. WHEN THE PRESSURES OF THE RECEIVERS IN THE FIRST LINE DROP TO THE PRESELECTED LOWER PRESSURES, A FRESH LINE OF RECEIVERS AT THE HIGHER PRESSURES IS CUT IN, THUS PROVIDING CONTINUOUS OPERATION.

Inventors

• 👤 William H Nebgen

Bibliographic Details