What control and interlock systems do steam boilers have?
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Everyone, please share what types of alarm and interlock devices are necessary for steam boilers, and how they are implemented. Also, is it required that the power load for the steam boiler feed pump be at the first level or higher, and under what circumstances is this necessary?
One of our company’s fluidized bed boilers has two interlocks: 1. An interlock between the exhaust fan and the blowfan – if the exhaust fan stops, the blowfan also stops； 2. Steam pressure interlock: the boiler shuts down when the steam pressure exceeds the set limit. The chain furnace has a interlock: 3. Slag remover interlock – when the slag remover stops, the boiler shuts down as well.
There must be more than just these; are there any more specific ones?
Interlocks should be installed for fan failures, excessively low liquid levels, and abnormally high steam pressure; that is, once these signals are detected, a signal is sent to the burner to initiate the shutdown and protection procedure. Fuel and gas boilers may also experience issues such as failed ignition or unsuccessful ignition with a strong flame; the settings need to be adjusted according to your specific circumstances.
What to do in case of an emergency shutdown in a fluidized bed boiler