| 摘要 |
PROBLEM TO BE SOLVED: To provide a chemical injection device for a boiler capable of injecting a proper chemical amount into each of replenishing water and initial feed water, and capable of preventing endless chemical injection and excessiveness of the chemical amount even when there is capacity deterioration of a feed water pump while being a simple system. SOLUTION: A boiler device is provided with each of a feed water line 3 having the feed water pump 2 and feeding water to the boiler 1, a chemical injection line 6 having a chemical injection pump 4 and injecting chemicals into the feed water to the boiler 1, and a chemical injection controller 11, and it feeds water mixed with the chemicals. In the chemical injection controller 11, settings of a first chemical injection quantity, and a second chemical injection quantity larger than the first chemical injection quantity are carried out as setting values of chemical injection pump discharge quantities, and setting of a first chemical injection time is carried out as a setting value of a chemical injection pump operation time. The chemical injection controller starts operation of the chemical injection pump 4 by the first chemical injection quantity and carries out measurement of the chemical injection pump operation time in interlock with operation starting of the feed water pump 2. It carries out control of changing the chemical injection pump discharge quantity from the first chemical injection quantity to the second chemical injection quantity if the feed water pump 2 keeps on operating even when the chemical pump operation time reaches the first chemical injection time, and stopping even operation of the chemical injection pump 4 if the feed water pump 2 stops. COPYRIGHT: (C)2007,JPO&INPIT
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