| 摘要 |
PROBLEM TO BE SOLVED: To provide a boiler system which improves a hunting suppression effect when a set pressure range or the like is changed.SOLUTION: A boiler system includes a unit number control means 3 which controls a combustion rate of a boiler 20 to be controlled so that steam pressure stays within a set pressure range based on steam pressure measured by a steam pressure measuring means 7. When a setting value X for one or more of an upper threshold, a lower threshold, and a controlled boiler total evaporation volume within the set pressure range is changed, the unit number control means 3 changes the setting value X step by step by taking a given transfer time T1. In this process of changing the setting value X, the unit number control means subtracts a pre-change setting value X1 from a post-change setting value X2 to produce a setting value difference Y1 and divides the setting value difference Y1 by a dividing number n to produce a unit difference Y2. Then, the unit number control means changes the setting value X to be changed step by step in such a way that the unit difference Y2 is added to the pre-change setting value X1 at each unit time T2 given by dividing the transfer time T1 by the dividing number n so that the pre-change setting value X1 is changed to the post-change setting value X2 after the lapse of the transfer time T1. |
