Frequency converting control method and system of condensate pump of condensed steam generator set

A technology for condensate pumps and generator sets, which is applied in pump control, machine/engine, mechanical equipment, etc. It can solve the sloshing of the sealing water temperature adjustment circuit of the steam pump, the influence of the deaerator water supply control valve, and the influence of the water level of the deaerator. Large and other problems, to achieve the effect of avoiding frequent changes in opening, reducing energy consumption, and low speed

Active Publication Date: 2013-06-05
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Claims
  • Application Information

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Problems solved by technology

[0007] In addition, when meeting the pressure increase demand of the condensate water system, the frequency converter will carry out frequency conversion increase, and the pressure of the main pipe at the outlet of the condensate pump will increase rapidly, which will have a great impact on the water level of the deaerator, which will affect the control of the water supply regulating valve of the deaerator
[0008] Since the sealing water of the steam pump sealing wa

Method used

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  • Frequency converting control method and system of condensate pump of condensed steam generator set
  • Frequency converting control method and system of condensate pump of condensed steam generator set
  • Frequency converting control method and system of condensate pump of condensed steam generator set

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Embodiment Construction

[0039] An embodiment of the present application provides a frequency conversion control method for a condensate pump of a condensing steam generating set, which is applied to a frequency conversion control system of a condensate pump. The system includes a frequency converter, a condensate pump, a motor, and a deaerator. Automatic switching between level control mode and pressure control mode, the liquid level control mode is to control the water level of the deaerator, and the pressure control mode is to control the pressure of the condensate pump outlet main pipe; see figure 1 , the method includes the following steps:

[0040] 101. When the frequency converter is in the liquid level control mode, control the water level of the deaerator through the frequency converter and the water supply regulating valve of the deaerator.

[0041] Wherein, the water supply regulating valve includes a water supply main regulating valve and a water supply auxiliary regulating valve.

[0042...

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Abstract

The invention discloses a frequency converting control method and system of a condensate pump of a condensed steam generator set. When a frequency converter is in a liquid control mode, the water level of a deaerator is controlled by the frequency converter and a water adjusting valve on the deaerator, and the frequency converter controls the water level of the deaerator by adjusting the rotating speed. A water feeding main adjusting valve on the deaerator is maintained at certain aperture according to the load of a machine unit; and under the same load, when the machine unit is in a load up stage, the aperture of the water feeding main adjusting valve is maintained to be small, and when the machine unit is in a load down stage, the aperture of the water feeding main adjusting valve is maintained to be large. Simultaneously certain load space can be generated by control of two clamped curves during load up and load down, and frequent aperture changing of the water feeding adjusting valve caused by small load fluctuation can be avoided. The rotating speed of the frequency converter can be lower, the current is small, the output frequency of the frequency converter is in the adjustable and economical range, and energy consumption of the frequency converter is reduced.

Description

technical field [0001] The present application relates to the technical field of frequency conversion control of condensate pumps, in particular to a method and system for frequency conversion control of condensate pumps in condensing steam generator sets. Background technique [0002] The condensate pump is an important power equipment of the condensate system. Its function is to drive the condensate in the steamer into the low-pressure heater for heating and then send it into the deaerator. [0003] The frequency conversion control of the condensate pump is an operation mode of the condensate pump. The power supply frequency of the condensate pump is changed according to the actual condensate flow, the pressure of the condensate tube, and the load of the unit, and the automatic adjustment of the motor speed of the condensate pump is realized through the conversion of the power supply frequency. [0004] Corresponding to the frequency conversion control of the condensate pu...

Claims

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Application Information

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IPC IPC(8): F04B49/06
Inventor 罗志浩戴航丹尹峰郑卫东章卫军吴永存
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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