| 摘要 |
<P>PROBLEM TO BE SOLVED: To control a temperature of water and steam flowing in a heat exchanger in a boiler within a predetermined acceptable range even if an air combustion system is switched to an oxygen combustion system. <P>SOLUTION: The boiler plant can switch the oxygen combustion system for combusting fuel by oxygen gas and circulating exhaust gas and the air combustion system for combusting the fuel by using air, and comprises the boiler having a steam system equipped with an economizer, a furnace water wall, and a superheater in this order from the upstream side and a control device for controlling the boiler. The control device includes a water supply control circuit for setting a water-supply temperature of water supplied to the steam system of the boiler and a correction circuit for correcting the water-supply temperature based on at least either a difference between a water temperature at an outlet of the economizer and a saturated water temperature or a difference between a steam temperature at an inlet of the superheater and a saturated steam temperature. <P>COPYRIGHT: (C)2010,JPO&INPIT |
