| 摘要 |
PURPOSE:To reduce effectively oxygen dissolved in feed water by effectively warming the feed water to be sent to a daerator with auxiliary steam and evacuating the inside of the deaerator with a deaerator vent system. CONSTITUTION:The lower end part of a feed water communicative pipe 10 for communicating a deaeration chamber 1 with a water storage tank 12 is led below the water surface in the water storage tank 12, (a) a vent pipe 14 provided with an orifice 14a and a stop valve 15 for the vent pipe and (b) a start-up vent pipe 16 furnished with a stop valve 17 for the vent pipe are arranged in parallel between the deaeration chamber 1 and a condenser and a pipe 18 for supplying heated steam to the deaeration chamber 1 is provided. The feed water deaeration device is used for heating the feed water to a boiler. When the boiler is started, the valve 17 is opened and a part of heated steam is introduced into the water storage tank 12. Consequently, time necessary for deaeration and cleanup at startup can be reduced, the amt. of auxiliary steam is saved and the cost of in-plant boiler equipment can be reduced.
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