Design and Realization of Drum Level Control System for 300MW Unit

Abstract

The drum water level is a very important operating parameter of a drum boiler, and it is also a sign of whether the boiler steam system is balanced. Maintaining the water level of the steam drum within a certain allowable range is a necessary condition to ensure the safe operation of boilers and steam turbines. Excessive water levels will affect the normal operation of the steam separator, and the steam quality will deteriorate. When the superheater tube wall and the steam turbine blade become fouled seriously, it will cause the steam to carry water and cause the steam turbine water impact to damage the equipment. If the water level is too low, the water circulation will be destroyed, and in severe cases, the water wall pipe will be deformed and burst. Therefore, the water level control of the steam drum has always received great attention. For the control of the water level of the steam drum, the motivation is to adapt the boiler water supply to the boiler's evaporation capacity, maintain the steam drum water level within the specified range, and at the same time maintain a stable water supply flow.