| 摘要 |
PROBLEM TO BE SOLVED: To prevent a hunting from being generated and to stabilize the supply of vapor in a multi-can type system of boilers. SOLUTION: This multi-can type boiler is provided with a plurality of boilers set in parallel, a pressure detecting device for detecting the pressure of vapor generated in the boilers, a number controller for controlling the number of combustion boilers based on the vapor pressure value detected. A set value for number limitation and a set value for number limitation release are set within the range of the vapor pressure control. When the vapor pressure value becomes higher than the set value for number limitation, the numbers are controlled based on a combustion pattern (pattern B) reducing the number of boilers and the number of pressure division which are subjected to the number control. When the vapor pressure value becomes lower than the set value for number limitation release, the numbers are controlled based on a combustion pattern (pattern A) increasing the number of boilers and the number of pressure division which are subjected to the number control. COPYRIGHT: (C)2004,JPO
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