How to diagnose and handle boiler water shortage accidents?

What is meant by a boiler running out of water? During operation, when the water level indicated by the water gauge falls below the lowest safe water level, it is referred to as a situation of insufficient water in the boiler. It is divided into mild water shortage and severe water shortage in the boiler. So-called mild water shortage refers to a situation in which, when the water level in the boiler disappears from the gauge, the level can reappear by flushing the gauge and using the \"call for water\" method; this is known as mild water shortage in the boiler. When the \"call for water\" method is used and the boiler water level still does not appear on the gauge, it is referred to as a severe water shortage in the boiler. When the steam drum runs out of water, it disrupts the water circulation, leading to stagnation, separation of steam and water, and evacuation of the downcomer. Severe water shortage can even dry out the boiler, resulting in serious accidents. At the same time, water shortage can cause the steam temperature to rise significantly, even affecting the safe operation of the equipment. The main signs of low water level in a boiler are: the water level in the gauge being below the lower limit, or no water level being visible; moreover, the low-water-level gauge indicates an increasing negative value ； The two-color water level gauge is completely red ； The water level alarm emits a sound and the low water level indicator light turns on ； In boilers with superheaters, the temperature of the superheated steam increases ； The water supply volume is abnormally lower than the steam flow rate. Methods for dealing with a boiler running low on water: When the water level cannot be seen on all of the boiler’s visual water level gauges, the boiler must be stopped immediately, and the following procedures should be followed. ① Perform the \"call for water\" operation on boilers that are capable of it. Note that the \"call for water\" procedure is a method used to determine the degree of water shortage in the boiler; it is only applicable to boilers whose water level gauge outlet is above the highest heating surface of the boiler and which have a large water capacity. For boilers in which the water inlet hole of the water level gauge is below the highest heating surface of the boiler and whose water capacity is low, the \"call for water\" procedure cannot be used; otherwise, it will delay the response to a water shortage incident in the boiler, leading to an escalation of the problem. For boilers that allow for a \"water call\" operation, once the water level appears on the gauge after performing this call, the boiler’s feed water valve can be slowly opened. Once the water level is restored (make sure not to let the water level rise too high), the combustion equipment of the boiler can be started to enable it to continue operating. If there is a loud noise inside the boiler when the boiler-level water valve is opened slowly, or if the water level does not rise even when the feed water supply is increased, the combustion equipment of the boiler must not be started; instead, the boiler should be shut down for inspection. ② For boilers that can be subjected to a \"water call\" operation, if no water level is indicated on the gauge after such a call, it is strictly prohibited to add more water to the boiler; the boiler must be shut down immediately. Boilers that are not suitable for a \"water call\" operation should also be shut down urgently.

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