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Method for automatic energy-saving control of constant-rotating-speed centrifugal compressor

A centrifugal compressor, energy-saving control technology, applied in the direction of pump control, machine/engine, mechanical equipment, etc., can solve the problems of large pressure fluctuation, pressure overshoot, cumbersome process, etc., achieve remarkable energy-saving effect, stable control, and control flexible effects

Active Publication Date: 2019-04-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although energy-saving control can be achieved by manually closing the opening of the IGV and BOV, it requires human intervention and operation. The process is cumbersome and easily leads to misoperation. In the actual application process, there will be problems such as mutual interference between the two pressure control loops, large pressure fluctuations, easy to cause pressure overshoot, and in extreme cases, the opening of the IGV will be too small, causing the compressor to enter the surge zone, etc.

Method used

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  • Method for automatic energy-saving control of constant-rotating-speed centrifugal compressor
  • Method for automatic energy-saving control of constant-rotating-speed centrifugal compressor
  • Method for automatic energy-saving control of constant-rotating-speed centrifugal compressor

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Embodiment 1

[0033] The method for automatic energy-saving control of a centrifugal compressor with a constant rotational speed of the present invention includes the regulation of the opening of the BOV and the regulation of the opening of the IGV, wherein the regulation of the opening of the BOV is automatically controlled by the system pressure regulator. When the BOV is not completely closed, the The opening regulation of the IGV includes the following steps:

[0034] 1) According to the corresponding working pressure (compressor outlet pressure), set the minimum opening value of the IGV; collect the corresponding IGV opening value when the minimum operating current is reached; set the energy-saving control current according to the anti-surge current, and collect the energy-saving current The corresponding IGV opening value when the current is controlled; the artificially set minimum opening value of the compressor operating IGV, as one of the control points for whether the automatic ene...

Embodiment 2

[0043] like figure 1As mentioned above, compared with Embodiment 1, the difference of this embodiment is reflected in the following aspects: draw a schematic diagram of the "discharge pressure-current" anti-surge of the compressor, draw an anti-surge line on this schematic diagram, according to the anti-surge The energy-saving control line is drawn from the surge line, and the corresponding energy-saving control current under different working pressures can be directly reflected according to the energy-saving control line; The surge control line can prevent the occurrence of surge; it can be seen from the anti-surge diagram of the compressor's discharge pressure-current that the safe working point of the unit is on the right side of the anti-surge line, and the working point should not cross the anti-surge during normal operation. Vibration line, considering the fluctuation of the surge point after the compressor runs for a long time and the normal fluctuation of the compresso...

Embodiment 3

[0045] like figure 1 As shown in the figure, compared with the above-mentioned embodiment, the difference of this embodiment is that the set energy-saving control current is embodied. Usually, the set energy-saving control current exceeds the corresponding anti-surge current by 4%-6%. In the embodiment, the set energy-saving control current exceeds the corresponding anti-surge current by 5%, which is figure 1 The specific performance is: the distance between the energy-saving control line and the anti-surge line is 5% of the anti-surge current; such as figure 1 : The pressure corresponding to the working point A is 1.3MPa, the current is 160A, the current corresponding to the energy-saving control line is 143A, and the current corresponding to the anti-surge current line is 137A. The distance between the energy-saving control line and the anti-surge line is 7A. When the IGV is turned off by the energy-saving control, when the working point A is moving to the left due to the ...

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Abstract

The invention discloses a method for automatic energy-saving control of a constant-rotating-speed centrifugal compressor. The method comprises the openness adjustment of a BOV and the openness adjustment of an IGV; when the BOV is not totally closed, the openness adjustment of the IGV comprises the following steps: 1) the lowest openness value of the IGV is set; the corresponding IGV openness value when reaching the lowest operation current is acquired; and the corresponding IGV openness value when reaching the energy-saving control current is acquired; 2) the three IGV openness values acquired in the step 1) are compared; and the highest IGV openness value in the three is selected as the lowest IGV openness value for energy-saving control; and 3) the openness of the IGV is gradually reduced through a controller or an adjusted compiled by automatic energy-saving program instructions; and when the openness value of the IGV reaches the lowest IGV openness value for energy-saving control,the energy-saving control is stopped. The method has the advantages of safety, reliable, stable control and obvious energy saving effect.

Description

technical field [0001] The invention belongs to the field of motor-driven constant-speed centrifugal compressor control, in particular to a method for automatic energy-saving control of a constant-speed centrifugal compressor. Background technique [0002] The constant speed centrifugal compressor driven by the motor is usually realized by adjusting the opening of the IGV and BOV to ensure the stability of the outlet pressure during normal operation, and the same outlet pressure can be combined with different openings of the IGV and BOV. To complete, when the IGV opening is large, the BOV may open the pressure relief to achieve the stability of the outlet pressure, resulting in the unit venting and running without energy. When the BOV is fully closed, if the pressure of the gas device is held back or the load is lowered, the gas consumption is greatly reduced, the BOV of the compressor is likely to be opened to release the pressure, which will also cause the unit to be vente...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D17/10F04D27/02
CPCF04D17/10F04D27/0253
Inventor 左国兵
Owner CHINA PETROLEUM & CHEM CORP