OPERATION CONTROL DEVICE OF ONCE-THROUGH BOILER, OPERATION CONTROL METHOD, AND ONCE-THROUGH BOILER

摘要

The purpose of the present invention is to provide a control method and a control device which, while maintaining the soundness of an entire heat transfer tube in a once-through boiler, can decrease the amount of water supplied at the time of load change during through-flow operation. This operation control device (70) of a once-through boiler (10), which supplies water to a heat transfer tube (53) of the boiler and removes superheated steam generated by a heat exchange with an internal heat source, divides the heat transfer tube into multiple regions and calculates, with different methods for each region, the minimum water supply amounts at which the through-flow operation can be maintained, and, on the basis of the permissible water supply amount, which is the highest of said minimum water supply amounts, performs control to adjust the amount of water to supply to the heat transfer tube during through-flow operation.