| 摘要 |
PROBLEM TO BE SOLVED: To level the operation rates of boiler groups when adding a consecutive control boiler group 2B to a same steam line of a stage value control boiler group 2A.SOLUTION: A boiler system 1 comprises: a first control unit 4A that controls the combustion state of the stage value control boiler group 2A so that the steam pressure value falls within the range of a control pressure zone; and a second control unit 4B that controls the combustion state of the consecutive control boiler group 2B so that the steam pressure value maintains a target steam pressure value. The second control unit 4B sets the target steam pressure value so that it falls within the range of the control pressure zone. When a state in which the operation rate of the second boiler group 2B is less than a first threshold value continues for a first period of time, the target steam pressure value is corrected to a value higher than the target steam pressure value that is currently set; when a state in which the operation rate of the second boiler group 2B is greater than a second threshold value continues for a second period of time, the target steam pressure value is corrected to a value lower than the target steam pressure value that is currently set.SELECTED DRAWING: Figure 1 |
