| 摘要 |
PROBLEM TO BE SOLVED: To allow a boiler to continue proper operation as much as possible by preventing degradation in combustion state in the boiler due to accumulation of water in the bottom part within a feed water preheating device.SOLUTION: There is provided a boiler 1 with a feed water preheating device 7 in which heat transfer tubes 3 for flowing feed water to the boiler 1 is provided in an exhaust gas passage 2 for flowing combustion exhaust gas from the boiler 1 and which preheats the feed water to the boiler 1 by heating the heat transfer tubes 3 with the combustion exhaust gas. The exhaust gas passage part for flowing the combustion exhaust gas, within the feed water preheating device 7 includes a drain discharging port 6 and a drain discharging pipe 5 for discharging water accumulated in the exhaust gas passage part, and further includes a pressure detecting device 4 for detecting a pressure of the combustion exhaust gas flow flowing in the exhaust gas passage. When an increasing of pressure loss at the exhaust gas passage is detected with the pressure detecting device 4, the occurrence of abnormal state is notified and water in the feed water preheating device is discharged. |
