System and method for controlling water level of deaerator

Abstract

The invention discloses a system and a method for controlling the water level of a deaerator. The system comprises a water level acquisition module and an internal model controller, wherein the water level acquisition module is used for acquiring the current water level of the deaerator and transmitting the acquired current water level to the internal model controller; and the internal model controller is used for regulating the valve position of a deaerator regulating valve according to both the set water level and the current water level of the deaerator, thereby changing the rate of flow of the condensed water and realizing the control on the water level of the deaerator. The system / method can obviously improve the regulation quality of the water level of the deaerator in a generator set for both a steady-state process and a dynamic-state process.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a system and method for controlling the water level of a deaerator. Background technique [0002] The deaerator undertakes the task of deoxygenation in the thermal system of the power plant to prevent equipment corrosion. At the same time, it is one of the hybrid heaters in the heat recovery system and serves as a buffer and water storage device between the condensate pump and the feed water pump. . figure 1 It is a thermal system in a generator set that uses PID to control the water level of the deaerator. Such as figure 1 As shown, the chemical make-up water in the pressure-stabilizing water tank 104 enters the condenser 102 through the chemical make-up water regulating valve 107, then enters the condensate jellyfish pipe 108 through the condensate water pump 103, and is heated by the shaft seal heater 111, the low-pressure heater 109 and steam After the deaerator 110, it en...

AI Technical Summary

Problems solved by technology

The existing control system uses a PID controller, which has poor controllability in actual operation, especially cannot meet the requirements of variable load conditions

The water level of the deaerator is a non-self-balancing thermal object, which has the characteristics of large hysteresis and large inertia. In actual operation, it takes more than five minutes to control the water level of the deaerator. Moreover, there may be multiple units in actual operation. In the case of the unit sharing the deaerator, the conventional PID control scheme is difficult to meet the control requirements

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