| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a chemical feeding device and a chemical feeding method, capable of controlling a chemical feeding amount to attain a chemical concentration strictly coinciding with a target value, also in a boiler water feeding facility in which its flow rate substantially varies within a short period of time.SOLUTION: This invention relates to a control device of chemical injection to a boiler for controlling a discharging amount of a chemical injection pump 7 in proportion to a measured flow rate by a flow meter 10. An average chemical concentration in fed water is calculated in reference to both of an amount of fed water per prescribed period acquired by the flow meter 10 and a reduced amount of chemical in a tank 6 per prescribed period acquired by a sensor 9, and the chemical injection pump 7 is controlled in such a way that the average chemical concentration is maintained in a range of a target chemical concentration on the basis of the pre-set target chemical concentration in the fed water and the calculated average chemical concentration.</p> |
