| 摘要 |
PROBLEM TO BE SOLVED: To provide a boiler system capable of controlling the number of boilers on the basis of superiority of a stage value control boiler and a proportional control boiler.SOLUTION: In a boiler system 1 including a boiler group 2 in which stage value control boilers 20A and proportional control boilers 20B are coexisted, a number control device 3 for controlling the number of boiler groups 2, includes an output control portion 41 for controlling a combustion state of the boiler group 2 so that the steam of a required steam amount is output from the proportional control boiler 20B according to a requested load, and an output switching portion 42 for switching the output of the steam amount corresponding to a combustion position from the proportional control boiler 20B to the stage value control boiler 20A under a condition that the steam amount output from the proportional control boiler 20B reaches a prescribed steam amount which exceeds the steam amount corresponding to a combustion position combustible in the stage value control boiler 20A. |
