METHOD AND CONFIGURATION FOR DEAERATING A CONDENSATE

摘要

CONDENSATE OF A COMBINED -CYCLE GAS AND STEAM-TURBINE PLANT IS DEAERATED. THIS CONDENSATE IS HEATED IN A FEEDWATER TANK (26) TO WHICH PREHEATED CONDENSATE IS SUPPLIED.THE CONDENSATE IS PREHEATED IN A WASTE-STEAM GENERATOR (1) HEATED BY WASTE HEAT OF THE GAS TURBINE (2A).FEEDWATER IS EXTRACTED AND WARMED IN HEATING SURFACES CONNECTED IN THE WATER/STEAM LOOP (3) OF THE STEAM TURBINE (2B) AND HEATED BY THE EXHAUST GAS FROM THE GAS TURBINE (2A) IN ORDER TO GUARANTEE ADEQUATE DEAERATION OF THE CONDENSATE AT A SIMULTANEOUSLY HIGH EFFICIENCY OF THE PLANT THROUGH ESPECIALLY HIGH ENERGY UTILIZATION OF THE WASTE HEAT FROM THE GAS TURBINE (2A), A PARTIAL FLOW OF THE PREHEATED CONDENSATE OR A PARTIAL FLOW OF PREHEATED FEEDWATER IS USED AS HEATING MEDIUM FOR HEATING THE CONDENSATE.A LOW-PRESSURE ECONOMIZER (42) IS CONNECTED DOWNSTREAM OF A CONDENSATE PREHEATER (6) IN THE WASTE-HEAT STEAM GENERATOR (1) VIA A FEEDWATER TANK (26). THE CONDENSATE PREHEATER (6) OR THE LOW-PRESSURE ECONOMIZER (42) HAVING ON THE OUTLET SIDE AN OUTFLOW LINE LEADING INTO THE FEEDWATER TANK (26).THE MOST ILLUSTRATIVE DRAWING IS (FIGURE NO. 1)