Abstract
A new sequence control system structure is applied to an automatic burner control system which is installed at a large capacity boiler of a thermal power station and controls lighting off and shutting down sequences of a large number of burners. Concerning the whole system structure, instead of having an exclusive sequence control block for each burner as in the conventional systems, this system has only two sequence control blocks shared among all burners and operates each burner alternately by the arrival order of operation request. This conception avoids idle components and attains a very efficient system.
The sequence control block consists of several linkages of sequence units. Each unit performs a unit sequence in burner operation. This sequence control block construction method simplifies the design steps of the block, the alternation of its functions, the follow-up of the sequence and the detection of troubles, and moreover realizes highly safe control.
A prototype model of this newly developed system was prepared and experiments were performed with actual burners. It was found that the model establishes optimum and uniform means to operate burner systems.
