The main tasks of boiler operation adjustment are:
(1) Maintain good boiler combustion and improve boiler efficiency;
(2) Maintain normal steam temperature, steam pressure, and steam drum water level;
(3) Maintain the quality of saturated steam and superheated steam to be qualified;
(4) Maintain the evaporation capacity of the boiler to meet the needs of steam turbine and heat users;
(5) Maintain the safe and economical operation of boiler units.
The purpose of boiler operation adjustment is to maintain stable steam temperature, steam pressure, steam drum water level, excess air coefficient, furnace negative pressure, etc. within the rated or allowable range by adjusting fuel quantity, feedwater quantity, cooling water quantity, air supply volume, and induced draft volume.
Boiler water level adjustment
Boiler water level regulation is achieved by adjusting the opening of the feedwater regulating valve. During the regulation process, uniform feedwater should be ensured, and interruption of boiler feedwater during normal operation is strictly prohibited.
During normal operation, maintain a water level of 0 mm in the steam drum, with an allowable fluctuation range of ± 30mm and a height not exceeding ± 50mm.
The water level of the steam drum should be based on the indication of the local water level gauge, and each water level gauge should be checked and calibrated every two hours.
During automatic water supply regulation, it is necessary to closely monitor changes in water level and regularly compare the water supply flow rate with the steam flow rate to ensure consistency. When the automatic water level adjustment fails, it should be promptly switched to manual water level adjustment and the thermal personnel should be notified to eliminate the defect.
During normal operation, two or more steam drum water level gauges should be kept intact and functioning properly, with clear and accurate indications and sufficient lighting. If the water level gauge is unclear or there is doubt about its indication, it should be promptly flushed.
The water level gauge of the steam drum should be flushed once a day, and the high and low water level alarms should be tested once during each shift handover.
7. Maintain the normal feedwater pressure of the boiler. If it exceeds the allowable range, contact the turbine operator for adjustment.
Regularly monitor the feedwater temperature during operation and adjust it according to the situation.
Special attention should be paid to changes in water level in the following situations to prevent "false water level" and misjudgment.
