Function of the auxiliary boiler control program, process overview The flame burners of the auxiliary boiler are divided into 6 groups, numbered A to F. Each group includes 1 igniter, 1 gas burner and 1 oil burner. In the production, depending on the actual load requirements, some of the groups may be ignited by the process, or all of them may be used. At the same time, the gas burners and oil burners in each group may be ignited separately or simultaneously. The ignition process is: safe and allows the ignition interlock to be normal ※ igniter start ※ ignition flame ignition ※ main flame burner interlocking normal ※ start main flame ignition button ※ main flame ignition ※ ignition flame is extinguished.
The boiler combustion air is supplied by an electric fan and a steam turbine. When the auxiliary boiler starts driving, the electric fan is started. After the boiler is started normally, the turbine is switched to the turbine fan operation, and the electric fan is placed in the interlocking standby state, and the turbine can be automatically started when the turbine fan fails. The outlet of the fan has a damper, and its switching action is also controlled by the program: 1 to ensure that the damper must be closed when the electric fan starts, to prevent the motor from starting with load; 22 dampers are allowed to open at the same time, but can not be closed at the same time; Since the turbine needs a process to drive, whether it can be used normally after starting, it must be determined by humans. Therefore, when the electric fan is switched to the turbine fan, the switching of the damper is done manually, and when the turbine fan fails, the electric fan starts automatically. When the damper is switched, it is also automatic. Instrument system analysis combined with the above process requirements, the instrument control program can be divided into the corresponding parts: safety and allow ignition interlock, igniter ignition program, burner ignition program, fan and damper switching procedures.
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