Why is it not allowed to replenish water when the boiler is experiencing a severe water shortage?

Boiler water shortage can be divided into two situations, one is slight water shortage, and the other is severe water shortage. If the water level is at the specified minimum water level but can still be seen, or the water level is no longer visible and the water is called by the "water method", when the water level can be seen, it is a slight water shortage.

If the water level is no longer visible, and the water level is still not visible by the "water calling method", it is a serious water shortage.

The procedure of calling water: first open the water discharge, close the steam plug, flush the water communication pipe part, and then slowly close the water discharge, pay attention to whether the water enters the water level gauge of the boiler, this method is called "called water method".

causes of water scarcity; Lack of control of water level; dereliction of duty on the part of the stoker; The water supply system fails, such as insufficient water supply pressure, water cannot be replenished, and the water level gauge indicates incorrectly and false water level occurs; Leakage caused by loose boiler blowdown valve can cause boiler water shortage.

The cause of the boiler water shortage should be found in time and dealt with correctly, and improper treatment will cause serious accidents.

Water shortage treatment method:

1) If the water level is just lower than the normal water level. However, it can still be seen that the water level should be strengthened and the water level should be flushed to restore the normal water level.

2) Check the water supply, water replenishment and other systems, whether there are problems such as damage and water leakage, and the furnace should be stopped for treatment in serious cases.

3) When the water level is still not visible after using the "water calling method" and flushing the water level gauge, there may be a serious water shortage accident, and the furnace should be stopped immediately, the fire should be quickly extinguished, and the cause should be found.

At this time, the operator should stay awake, avoid confusion, and strictly prohibit water into the boiler to avoid serious boiler accidents caused by rushing to replenish water after the boiler water is boiled dry.

If you find that there is a shortage of water, you should immediately stop the coal supply and air blasting, and turn on the phoenix to cool down. If you find that the water supply pump is in continuous operation when there is a water shortage, do not stop the water pump, and the operator should determine whether there is a water shortage by "calling for water"? If there is a real shortage of water, do not stop the pump as long as it is always working.

If you find that there is no water in the boiler and the temperature in the furnace is very high, do not give water, if you give water, a serious accident will occur. After the boiler cools down, check the cause of the accident.

When there is a severe water shortage in the boiler, the boiler must be stopped urgently, and it is not allowed to replenish water into the boiler.

This is mainly because: when the boiler has a serious water shortage, it is not known how low the water level of the steam drum is, and it may be that there is no water in the steam drum at all, or the water wall tube has been partially burned dry and overheated. In this case, if water is forcibly added to the boiler, the temperature difference is too large, which will cause huge thermal stress and damage to the equipment.

At the same time, when the water encounters the scorching metal surface, a large amount of vapor will evaporate in an instant, causing a sudden increase in vapor pressure, and even causing a pipe burst or a more serious accident. Therefore, when there is a serious water shortage, it must be dealt with in strict accordance with the provisions of the regulations, and blind water supply is never allowed.

Because the temperature is too high, there is a certain danger if water is added to cool it at this time. It is necessary to wait for his temperature to drop a little before adding water.

Related Notes:In the process of frequent start and stop of the boiler, due to the poor combustion condition of the furnace, the fuel is not easy to burn out, and when the flue gas flow rate is low, it is easy to cause a large amount of unburned combustible deposits; The boiler runs at low load for a long time, the combustion is unstable, the smoke velocity is low, and the unburned combustibles are easy to be deposited on the corrugated plate; The lessons and experience of previous accidents have also confirmed that the air preheater rotor is blocked by ash, air leakage after wear, excess air coefficient at the tail of the flue or the oxygen content is too low to be controlled, etc., can lead to incomplete combustion of fuel due to lack of oxygen.

After 1997, the boiler could not run at full load due to various reasons, and the flue gas flow rate was low; Sometimes, in order to improve the thermal efficiency of the boiler, the excess air volume at the tail is blindly reduced. All of these leave hidden dangers for the secondary combustion of the air preheater.

1.Because the boiler is seriously short of water, the water level can no longer be accurately monitored at this time, and if the pot is dry, the water wall pipe may overheat and burn red.

2.At this time, the sudden inlet of water will cause the water wall tube to cool sharply, the pot water will evaporate immediately, the vapor pressure will rise suddenly, and the metal will be exploded by great thermal stress.

3.Therefore, the boiler is seriously short of water after an emergency shutdown. Only after the technical supervisory unit has studied and analyzed, comprehensively inspected, and found out the situation, the chief engineer will decide the water time, and after the water level is restored, the fire will be re-ignited.

The correct approach when the boiler is severely short of water is as follows:

When the boiler has a serious water shortage accident, it is necessary to stop the furnace urgently, stop the combustion and air supply immediately, reduce the induced air, stop the operation after 5 minutes, close the flue baffle, close the main gas valve, and absolutely prohibit water inlet into the boiler.

The correct thing to do is to cut off the fuel from the boiler immediately**. Since in a superheated boiler, the lack of water leads to a decrease in levels, an increase in the concentration of ion hoppers, an increase in the redox potential, and an overheating and oxygen shedding of the boiler's metal shell and piping. Therefore, it may be dangerous if the heating or replenishment of water continues.

When the boiler is severely short of water, immediately stop the fuel** to reduce the temperature in the flame boiler; stop feeding water to avoid bloating and other risks; Close the boiler's bleed valve as soon as possible to facilitate bleed and prevent overheating.

In addition, maintenance personnel should be notified immediately and the boiler should be approached as early as possible to assess the extent of damage and carry out necessary maintenance, such as replacing burned-out elements, etc. In this case, do not attempt to repair it yourself, as this may result in greater damage and danger. At the same time, in order to prevent the recurrence of boiler water shortages, operators can take a series of preventive measures, such as regularly checking and maintaining the removal of scale and salt, and maintaining the cleanliness of boiler equipment to prevent infiltration and corrosion.

In short, in the event of a severe water shortage in the boiler, immediately cut off the fuel**, notify the maintenance personnel, and take the necessary maintenance measures to prevent a catastrophic event. Operators should also carry out regular preventive maintenance to ensure the long-term stable operation of the boiler. <>

Summary. When the boiler is not short of water, but the lack of water protection shows a lack of water. It is possible that the meter indication is inaccurate, or the meter is damaged, resulting in no action of water shortage protection, and the water shortage is displayed.

When the boiler is not short of water, but it shows that there is no shortage of water, what is the cause of water shortage?

Hello, glad to answer for you

When the boiler is not short of water, but the lack of water protection shows a lack of water. It may be that the indication of the meter is inaccurate, or the meter is damaged, resulting in a lack of water to protect the water without action liquid, and the water shortage is displayed.

This phenomenon focuses on checking whether the level gauge itself and the connection line from the level gauge to the control cabinet are normal, and the problem is found to be dealt with in time.

Why is there something wrong with the water shortage alarm I sent just now?

I'll send you the reason, dear.

The meter indication is inaccurate, or the meter is damaged, resulting in no action of water shortage protection, and the water shortage is displayed.

Is there air or not. There is no water alarm. On behalf of the police, the police are short of water. What's the solution.

It is important to check whether the level gauge itself and the connection line from the level gauge to the control cabinet are normal.

Oh. Well, if you're happy with my reply, please give me a thumbs up when it's over Thank you.

When the boiler vapor pressure is normal, the feed water pressure is normal, and the drum water level exceeds +75mm, it is judged that it is indeed full water, and the cause is immediately identified.

If the water level is affected due to the automatic failure of the water supply, immediately change the automatic to manual, close the small adjustment door to reduce the water supply. If the water level continues to rise, open the accident drain door to release water.

If the water level of the steam drum still rises more than +100mm, close the water supply door or close the water supply door (open the economizer recirculation door when the water supply is stopped), and strengthen the water discharge.

According to the decrease in steam temperature, close or close the desuperheating water door, and open the superheater trap door if necessary.

If the water level of the steam drum exceeds the visible part of the water level gauge, immediately stop the furnace and close the main valve and notify the electrical and steam turbines to strengthen the discharge of water to the normal water level of the steam drum. When the water level rises due to abnormal feed water pressure, contact the steam engine immediately and return to normal as soon as possible.

1. When a slight water shortage accident occurs in the boiler, the treatment method is:

Reduce combustion, reduce combustion first.

material, in the reduction of air blast, and finally the reduction of induced air, and slowly feed water to the boiler, while quickly identifying the cause; And treat, after the water level gradually returns to above the minimum safe water line, then resume normal combustion, first increase the induced air, then increase the blast, and finally increase the fuel. 2. When the boiler has a serious water shortage accident, the furnace must be stopped urgently and the combustion must be stopped immediately.

Air supply, reduce induced air, stop running after 5 minutes, close the flue baffle, and turn off the main gas.

valves, and it is absolutely forbidden to pour water into the boiler.

In the case of severe water shortage, the reason why water can not be fed into the boiler is that the heating surface metal of the boiler dehydration part has been overheated, and even the red-burning strength is greatly reduced.