【Weekly Question for September】How to handle low water level in the drum of a circulating fluidized bed boiler?

Identify the cause of the low water level and take corresponding measures based on that cause.

Adjust the water inflow, carry out wastewater discharge, and identify the cause

Answer: When the water level in the drum of a circulating fluidized bed boiler is too low, the following measures should be taken: (1) Quickly identify the cause and increase the feedwater volume； And take corresponding action. (2) The boiler load should be reduced immediately to restore the water level as soon as possible. (3) After the fault is resolved, water should be slowly added to the boiler; once the water level is normal, ignition can be resumed. (4) After the maintenance personnel inspect the equipment, the chief engineer decides on the time for filling the boiler with water and starting it up, depending on the circumstances.

Low water level in the drum of a circulating fluidized bed boiler: no water addition immediately

Agree with the opinion on floor 4; the analysis is thorough! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

(1) Quickly identify the cause and increase the water supply volume； And take corresponding action. (2) The boiler load should be reduced immediately to restore the water level as soon as possible. (3) After the fault is resolved, water should be slowly added to the boiler; once the water level is normal, ignition can be resumed. (4) After the maintenance personnel inspect the equipment, the chief engineer decides on the time for filling the boiler with water and starting it up, depending on the circumstances.

When the feedwater pressure is normal but the drum water level is below the normal value: 1. Perform on-site remote calibration, clean the on-site water level gauge, and verify its accuracy. 2. Disengage the automatic water level control, open the feedwater valves to increase the flow rate of feedwater, and monitor any changes in the water level. 3. Check whether the feedwater control valve is stuck and unable to function properly, as well as whether the blowdown valve is leaking. 4. Reduce the boiler load appropriately; if the water level continues to drop, it is necessary to shut down the boiler for inspection. If the water level in the gauge disappears due to inadequate supervision by the operators, the boiler must be stopped immediately. Water should be introduced into the local gauge; if the water level appears in the gauge after this, water supply can be increased to restore the normal water level. If the water level does not appear, it is strictly prohibited to supply water to the boiler. Any further water supply requires approval from management

1. Verify the correctness of the indication of the low-level gauge; if doubts exist, compare it with the local water level gauge in the steam drum, and flush the gauge if necessary. 2. If the water level drops due to a malfunction of the automatic feedwater regulator, the control valve should be manually opened to increase the feedwater supply. 3. If the main water supply pipe control valve cannot increase the water supply, the auxiliary water supply pipeline should be activated to increase the water supply.

When the water level in the drum of a circulating fluidized bed boiler is too low, the following measures should be taken: (1) Quickly identify the cause and increase the feedwater volume； And take corresponding action. (2) The boiler load should be reduced immediately to restore the water level as soon as possible. (3) After the fault is resolved, water should be slowly added to the boiler; once the water level is normal, ignition can be resumed. (4) After the maintenance personnel inspect the equipment, the chief engineer decides on the time for filling the boiler with water and starting it up, depending on the circumstances.

How to deal with low water level in the drum of a circulating fluidized bed boiler? The following measures should be taken: 1. Check the trend; since the liquid level is only slightly low, add water manually immediately, and assign personnel to determine the cause and take appropriate action ； 2. If the liquid level drops rapidly and there is no time to add water manually, the production load can be reduced appropriately ； 3. If the liquid level drops rapidly, an immediate emergency shutdown is required to prevent accidents. 4. In the event of a false level reading (two levels) and it is not possible to determine the actual level, an emergency shutdown may be necessary.