The boiler is short of water! urgent
Thread Content
Due to low river water levels, raw water supply was interrupted, affecting boilers in operation. Due to insufficient monitoring of the liquid level of the deaerator, the drum had no water supply. The water level in the drum dropped from -50mm to -110mm in two minutes. The water level continued to drop, and an emergency fire was immediately suppressed. But it was too late, the water level dropped to a low level and it was impossible to "call for water". The boiler is on fire (the deaerator has been dry during this period). Now that we have dealt with this, what should be the correct way to deal with it next? Based on the actual situation, let’s discuss how to resume production as soon as possible (in the shortest possible time) without causing any safety accidents or equipment accidents?
The safest way is to wait for the boiler to cool down naturally before filling it with water and re-igniting it.
Slowly wait for the boiler to cool down and then turn on the water.
You can only add water after it cools down. Adding water if the temperature is too high will cause the explosion, so don’t rush.
At this time, the boiler should be seriously short of water. Fuel burning and air supply should be stopped immediately, and "water" should not be "called" at the same time. Only after the boiler has cooled down and water is added to the normal water level can fuel and air supply be added to resume normal combustion.
To reduce the draft, quickly pull out the coal in the furnace or cover the coal with sand or wet ash. The grate is slightly moved to the fast gear to clear the hot coal out of the furnace. However, water is not allowed to be poured into the furnace. After the furnace is stopped, open the ash door and furnace door, close the main flue baffle, promote air convection, speed up the furnace and when the temperature of the furnace water drops below 70°C, water can be fed into the furnace.
It is forbidden to re-enter the water, and find a way to discharge part of the heat directly without passing through the boiler. It is best to stop the fan. After cooling down, the severity of the water shortage will be evaluated before the boiler can be continued to be used or a metallographic structure examination may be required before use. I encountered this once in February
If you know in advance that the supply of raw water is not available, you should put down the fire immediately! If you cannot call for water, you must wait for the temperature to drop and check that there are no abnormalities before refilling the water to the normal water level and restarting the furnace.
You should just cool down and stop the boiler, and wait until the temperature drops before adding water. The boiler cannot be tested. If something goes wrong, it will be a big deal.
The first thing you need to figure out is what kind of fuel does this boiler use? If it is coal: 1. Turn off the draft fan, open all the furnace doors, quickly turn the grate, and quickly remove the fire bed. ； 2. Wait for the furnace temperature and drum pressure to drop before replenishing water. ； If the water shortage is serious, the furnace must be inspected to see if there is any overheating deformation. If necessary, a water pressure test must be performed! Fuel (gas): 1. Turn off the burner and increase the furnace purge to cool down the boiler quickly. ； Go to the second step ； If you encounter a similar situation in the future, the first choice is to reduce the load of the boiler, shut down the boiler if necessary, and close the main steam valve as small as possible to delay the time when the water level drops!
The answers everyone replied were almost all chain boilers. If this happens to a circulating fluidized bed boiler, what should be done specifically? It may be roughly the same.
At this time, water must not enter the boiler, otherwise the consequences will be serious! Do not stop the blower or induced draft fan. Let the temperature drop as soon as possible before starting work.
Serious water shortage, in this case the furnace must be shut down immediately. And keep blowing the air to bring the furnace temperature down as soon as possible.