| 摘要 |
PROBLEM TO BE SOLVED: To provide a boiler system avoiding stoppage in operation of all the boilers when a rapid reduction of load occurs at any one of them and converging a header pressure value rapidly to a target steam pressure value.SOLUTION: This invention comprises a group of boilers 2 that are composed of boilers 20 capable of combusting operation while changing their combustion rates and a control part 4 for controlling combustion states of the boilers 20 in response to a required load. The control part 4 includes an operation amount calculating part 41 for calculating an amount of operation through PID algorithm to keep a header pressure value at a target steam pressure value, an output control part 42 for controlling a combustion state of boilers 20 on the basis of the amount of operation, the first detecting part 43 for detecting that the header pressure value exceeds the target pressure value, and the second detecting part 44 for detecting whether or not the header pressure value is kept in increasing tendency. The output control part 42 performs to stop operations of all boilers when the amount of operation calculated by the operation amount calculating part 41 becomes lower than zero, and when the first detecting part 43 detects that the header pressure value exceeds the target pressure value and the second detecting part 44 detects that the header pressure value shows a tendency of increasing value.SELECTED DRAWING: Figure 1 |
