PURPOSE: To enable operation to maintain a pressure in a deaerator at a specified pressure state by controlling an amount of heating steam and a shutoff valve of a heating steam path based on individual detection information of a feed water temperature detection mechanism at a deaerator inlet port part and a pressure detection mechanism in the deaerator to actuate a means of lowering the temperature of feed water.

CONSTITUTION: In an equipment system comprising a waste heat boiler 6 provided in an incinerator 1, a high pressure steam reservoir 13, a steam power generator 3, a condenser 18, a deaerator 19 and the like, the amount of heating steam to be supplied to the deaerator 19 is controlled by a heating steam path shutoff valve 30 based on a feedback control by a detection value of a feed water temperature detection mechanism 28 for detecting the temperature of feed water near the inlet of the deaerator and detection information of a pressure detection mechanism 26 for detecting a pressure in the deaerator 19 to set the temperature of the feed water to a specified state by a command by a feed water temperature lowering means 27. Here, the command by the feed water temperature lowering means 27 lowers the temperature of the feed water to maintain the pressure in the deaerator within a proper range when the pressure in the deaerator rises above a reference operation pressure.