When the boiler is commissioned, when the compressor of the air source used for the test equipment stops operating, the fuel valve will slowly close even though the steam pressure drops, and even if it is switched to manual control, it will not work and the boiler will stop. This is due to the fact that the fuel valve conducts a fail-close operation and the operation of the boiler is safely stopped when the pressure of the air used for the detection device is reduced.
If, when the boiler is stopped, air is still being supplied to the combustion chamber, the residual, leaking fuel gas will not accumulate in the combustion chamber but will be discharged from the chimney, which is called “sweepingâ€. When an abnormal stop occurs, in order to perform scavenging, when the air pressure of the detection device drops, the air damper for controlling the combustion air is opened, which is a valve failing operation.
If, when the boiler is stopped, air is still being supplied to the combustion chamber, the residual, leaking fuel gas will not accumulate in the combustion chamber but will be discharged from the chimney, which is called “sweepingâ€. When an abnormal stop occurs, in order to perform scavenging, when the air pressure of the detection device drops, the air damper for controlling the combustion air is opened, which is a valve failing operation.
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