Problems with making up water in steam boilers

Normal. If it is below the lower limit. The boiler will shut down automatically. This indicates that the low water level interlock protection device has activated.

It’s normal; chains usually need to be reset

The original poster didn’t express the problem very clearly, so I’ll guess. The boiler you mentioned, the situation where it needs to be shut down during water replenishment, is itself an accident condition. Regardless of the type of boiler, there is always someone on duty in the control room, and the main task of this person is to monitor the boiler feed water. During normal production, the boiler shuts down due to a low liquid level, which is a problem related to production safety. However, current natural gas-fired steam boilers actually suffer from the problem of rapid drop in liquid level caused by rising drum pressure when external user load fluctuates. When the liquid level falls below the set value, a safety protection mechanism activates and the boiler stops operating. Under those operating conditions, the furnace pressure must have gradually decreased, eventually reaching very low levels of just a few dozen KPa. The above operating conditions are not normal; generally, the specific parameters as well as the specific treatment processes and results must be recorded in duty logs. In the presence of the above conditions, it is necessary to check whether the boiler’s water makeup method is appropriate For example, feed water passing through a control valve – this type of operating condition is quite common. The general solution is to install a backup pump, which can be activated manually or automatically when necessary.

It is normal to shut down the plant when the water level is low, but it is abnormal when there isn’t enough feedwater available when the load increases – could there be a problem with the automatic water supply setting?