| 摘要 |
PROBLEM TO BE SOLVED: To provide a boiler device capable of effectively preventing degradation of combustion efficiency and occurrence of incomplete combustion due to fluctuation of an air ratio, while keeping efficiency in combustion control.SOLUTION: A boiler device 1 includes: a control value setting portion 91 for setting an opening value corresponding to a flow rate of combustion air detected by an air differential pressure sensor 33; a flow rate control portion 95 having a first control mode for controlling a flow rate adjustment valve 56 on the basis of the opening value, and a second control mode for controlling the flow rate adjustment valve 56 by adding a correction value to the opening value; a mode determining portion 96 for shifting the first control mode to the second control mode when a measurement value detected by an Osensor 81 is more than an upper limit or less than a lower limit of a prescribed range of concentration in a state that the flow rate adjustment value 56 is controlled in the first control mode; and a correction value setting portion 97 for setting the correction value on the basis of the measurement value determined to be more than the upper limit or less than the lower limit of a first range by the mode determining portion 96.SELECTED DRAWING: Figure 1 |
