CONTROL METHOD, PROGRAM, CONTROLLER OF BOILER GROUP, AND BOILER SYSTEM

摘要

Provided is a control method, program and controller of a boiler group which can supply steam stably even if the combustion state is changed in a boiler group consisting of a plurality of boilers including boilers having a turndown ratio different from that of other boilers, and also provided is a boiler system. A program for controlling a boiler group including a plurality of boilers which increase/decrease the amount of combustion step by step and having boilers configured so that the differential evaporation amount which is increased or decreased when the combustion position is shifted by one step is different from that of other boilers is characterized in that, when the total evaporation amount obtained by summing the evaporation amounts of boilers that are during combustion among the boiler group or a physical quantity corresponding to the total evaporation amount is maintained for a predetermined time, the combination of the boilers to be used for combustion among the boiler group and the combustion positions thereof is changed while maintaining the total evaporation amount within a predetermined range.