How to control the water level and steam temperature of the load shedding boiler

If it is a large boiler used in a power plant, the method of controlling the water level not to exceed the water level protection action value is as follows:

1. After the load is shaken, the boiler evaporation decreases and the pressure rises instantaneously, and the boiler water level drops, forming a false water level, at this time, the feed water flow should not be increased, if the boiler pressure does not rise to the safety door action value, the feed water flow should be reduced to prevent the boiler from high water level protection action;

2. After the boiler safety door action due to load rejection, the boiler evaporation will increase a lot and the boiler pressure will drop sharply, so the feed water flow should be increased rapidly to prevent the boiler from low water level protection action, and the feed water flow should be reduced immediately after the safety door is returned to prevent the boiler high water level protection action.

1. After the load is shaken, the boiler evaporation decreases and the pressure rises instantaneously, and the boiler water level drops, forming a false water level, at this time, the feed water flow should not be increased, if the boiler pressure does not rise to the safety door action value, the feed water flow should be reduced to prevent the boiler from high water level protection action;

2. After the boiler safety door action due to load rejection, the boiler evaporation will increase a lot and the boiler pressure will drop sharply, so the feed water flow should be increased rapidly to prevent the boiler from low water level protection action, and the feed water flow should be reduced immediately after the safety door is returned to prevent the boiler high water level protection action.

3. During the boiler start-up process, the drum water level should be adjusted according to the change of boiler working conditions. (1) At the initial stage of starting, the pot water is gradually heated, vaporized and expanded, so that the water level rises, at this time, it is not appropriate to use the accident water discharge door to reduce the water level, but should be discharged from the regular sewage discharge door, which can not only improve the quality of the pot water, but also promote water circulation. (2) With the increase of steam pressure and temperature, the amount of steam discharged increases, and the water supply should be replenished in time according to the change trend of the steam drum water level.

3) When the boiler flushing pipe or safety door is calibrated, it is often caused by the sudden increase of steam flow and the rapid drop of steam pressure to cause a serious "false water level" phenomenon, so the water level should be kept low before the above operation, and then the water supply should be increased according to the changed steam flow rate to prevent the water level from being too low due to the safety door return. (4) According to the load of the boiler, switch the operation of the water supply pipeline in time, and put in the automatic water supply installation according to the specified conditions.

Hello dear and happy to answer your <>

Reasons for kissing: 1. The steam system is faulty and the door is cut off; 2. Generator or unit failure; Phenomenon: 1. The boiler vapor pressure rises sharply, and the vapor pressure is bright and the signal light is on; 2. The steam flow rate decreases and the pressure increases; 3. The water level of the steam drum drops instantaneously and then rises; 4. The temperature of superheated steam increases; 5. When it is serious, the safety valve of the steam drum and superheater operates.

Treatment: Pay attention to monitor the water level when throwing the load, and if necessary, the feed water can be automatically switched to manual adjustment or turn off the feed water shut-off valve; The heat load is automatically detrained, and the coal feed is appropriately reduced according to the load situation. I hope this service can help you, you can click on my avatar to pay attention to the crack me, and if you have any questions in the future, you can consult me again, and we look forward to serving you again.

Wishing you well; Happy life, everything goes well [warm] [warm].

The water level of the boiler is an important indicator to ensure the normal steam supply and safe operation, and during the operation of the boiler, the operator should continuously monitor the water level in the boiler through the water level gauge. The boiler water level should always be kept at the normal water level and promised to fluctuate within 50mm above and below the normal water level. When the boiler load is stable, if the feed water and evaporation are equal, the boiler water level is relatively stable; If the amount of water supplied is not equal to the amount of evaporation, the water level will have to change.

Small boilers with intermittent water supply are most likely to cause various water level accidents due to the constant change of water level, and it is necessary to strengthen operation supervision and regulation.

For boilers with frequent load changes, the change of load causes a change in evaporation, which causes the difference between the amount of water supply and the amount of evaporation, and causes the water level to fluctuate. In order to keep the water level normal, the water level of the boiler should be slightly higher than the normal water level when the boiler is running at low load, so as to prevent the water level from falling too low when the load increases; When the boiler is running at high load, the water level should be slightly lower than the normal water level, so as not to rise too high when the load is reduced. When the load changes suddenly, there is a possibility of false water level, and the possibility of false water level should be taken into account in the adjustment, and the water level should be appropriately lowered before the load suddenly increases, and the water level should be appropriately raised before the load suddenly decreases.

The amount of water supplied cannot be adjusted according to false water levels.

In order to reliably supervise the water level, the water level gauge should be flushed regularly during boiler operation, at least once per shift. When the water level gauge does not see the water level, measures should be taken immediately to find out the actual water level in the pot, and it is strictly forbidden to put water on it until the actual water level in the pot is confirmed.