Deoxygenator water level whole-course control system and method with tracking under condensate pump frequency conversion condition

Abstract

The invention discloses a deoxygenator water level whole-course control system and method with tracking under a condensate pump frequency conversion condition. The system comprises a first control unit of a deoxygenator valve adjusting control system which is used for obtaining a deoxygenator water level set value and a process variable deoxygenator water level, and a second control unit of a condensate pump frequency conversion control system. The first control unit and the second control unit, according to a value of a load, determine whether the system is at an adjusting state or a tracking state, the first control unit then controls a first manual operator corresponding to the deoxygenator valve adjusting control system to adjust a deoxygenator water level through a valve adjusting instruction, and the second control unit controls the corresponding condensate pump frequency conversion control system through a frequency conversion instruction and then adjusts the deoxygenator water level through a second manual operator. By using the scheme, it is ensured that a valve adjusting mode and a frequency conversion mode are simultaneously automatically input, and interference-free switching is realized when the two modes are converted, such that the automation level is improved, and the energy conservation effect is also enhanced.

Description

Technical field [0001] The invention relates to a whole-process control system and method for the water level of a deaerator under the condition of variable frequency of a condensate pump with tracking. Background technique [0002] In thermal power generating units, the water level control system of the deaerator uses the throttling effect of the valve to control the water level. Under low load conditions, the valve opening is small, resulting in greater throttling losses; energy saving and consumption reduction work is a long-term national economy The focus of development is that many power generation companies have carried out energy-saving frequency conversion transformations on major auxiliary equipment of the unit. The frequency conversion transformation of large auxiliary equipment is one of the main ways to save energy and reduce consumption of generators. Among them, the 6kV motor of condensate pump is a large power-consuming equipment in thermal power plants. After the ...

AI Technical Summary

Problems solved by technology

[0003] Under the condition of frequency conversion, there are two ways to control the water level of the deaerator: throttling (valve adjustment) and pump speed adjustment (frequency conversion). The mutual interference of the process is generally the interlocking of the two automatic adjustment methods, but when interlocking, the controller that is not in the adjustment state will produce integral saturation, which makes the adjustment performance decline when the two switch, and the water level cannot be controlled in time, or even large fluctuations in water level

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