| 摘要 |
PROBLEM TO BE SOLVED: To provide a boiler system such that two boiler groups are individually controlled so that a waste heat recovery boiler belonging to a first boiler group 2A has an in-can pressure value within a range of a preset control pressure zone and a boiler belonging to a second boiler group 2B has a header pressure value equal to a preset target pressure value, and the target pressure value of the second boiler group 2B is set to be smaller than an upper-limit value of the control pressure zone of in-can pressure values of boilers of the first boiler group 2A, the second boiler group 2B securing a combustion amount equal to or larger than a predetermined amount without reference to a used steam amount.SOLUTION: The second boiler group 2B is configured to output a first steam amount V1 when a necessary steam amount MV calculated by PI or PID algorithm so that a header pressure value PV reaches a target pressure value P1 is less than a preset first steam amount V1, and to output the necessary steam amount MV when the necessary steam amount MV is equal to or larger than the first steam amount V1.SELECTED DRAWING: Figure 1 |
