PURPOSE: To improve the reliability and durability of a plant by shortening the deaeration time on plant startup, simultaneously saving the quantity of auxiliary steam and improving the quality of feed water.
CONSTITUTION: Steam jet nozzles 22 are installed under the surface of the water in a water storage tank 12. Not only a pipe 18 for feeding heating steam to a deaerating chamber 1 but also a pipe 20 for feeding the heating steam to the nozzles 22 are provided. The deaerating chamber 1 and a condenser are connected by a starting vent pipe 16. On boiler startup, a valve 19 is opened and simultaneously a valve 21 is opened to jet and feed heating steam into feed water in the water storage tank 12 and further a valve 17 installed at some midpoint in the starting vent pipe 16 is opened to evacuate the feed water deaerator.
URA KATSUMI
OSHIMA YOSHIKUNI
HITACHI ENG CO LTD