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A method for automatic energy-saving control of a centrifugal compressor with a constant speed

A centrifugal compressor, energy-saving control technology, applied in pump control, machine/engine, mechanical equipment, etc., can solve problems such as large pressure fluctuation, pressure overshoot, cumbersome process, etc., to achieve significant energy-saving effect, stable control, control flexible effects

Active Publication Date: 2021-02-05
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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  • A method for automatic energy-saving control of a centrifugal compressor with a constant speed
  • A method for automatic energy-saving control of a centrifugal compressor with a constant speed
  • A method for automatic energy-saving control of a centrifugal compressor with a constant speed

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Embodiment 1

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

[0034] 1) Set the minimum opening value of the IGV according to the corresponding working pressure (compressor outlet pressure); 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 The corresponding IGV opening value when controlling the current; the artificially set minimum opening value of the compressor running IGV, as one of the control points for whether the automatic energy-saving control function continues; the artificially set corresponding IGV...

Embodiment 2

[0043] Such as figure 1As mentioned above, compared with Embodiment 1, the difference of this embodiment is reflected in the following aspects: draw the "exhaust pressure-current" anti-surge schematic diagram of the compressor, draw the anti-surge line on the schematic diagram, and according to the anti-surge The energy-saving control line is drawn by the surge line, and the corresponding energy-saving control current under different working pressures can be intuitively reflected according to the energy-saving control line; the anti-surge control of the compressor adopts the "exhaust pressure-current" 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 line during normal operation. Vibration line, considering the change of the surge point after...

Embodiment 3

[0045] Such as figure 1 As shown, compared with the above-mentioned embodiments, 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; figure 1 : The pressure corresponding to 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 energy-saving control closes the IGV, if the operating point A moves to the left due to the current becoming smaller, if it reac...

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Abstract

The invention discloses a method for automatic energy-saving control of a centrifugal compressor with a constant speed, including the opening regulation of a BOV and the opening regulation of an IGV. When the BOV is not completely closed, the opening regulation of the IGV includes the following steps: 1. ) set the minimum opening value of the IGV; collect the corresponding IGV opening value when the minimum operating current is reached; collect the corresponding IGV opening value when the energy-saving control current is reached; 2) use the three IGV opening values ​​obtained in step 1) For comparison, select the largest IGV opening value among the three as the minimum IGV opening value for energy-saving control; 3) The IGV opening is gradually reduced through the controller or regulator compiled by the automatic energy-saving program instructions, when the IGV When the opening value reaches the minimum IGV opening value of the energy saving control, the energy saving control is stopped. Adopting this method has the advantages of safety and reliability, 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, and in particular relates to a method for automatic energy-saving control of a constant speed centrifugal compressor. Background technique [0002] When the motor-driven constant speed centrifugal compressor is in normal operation, in order to ensure the stability of the outlet pressure, it is usually realized by adjusting the opening of IGV and BOV, and the same outlet pressure can be combined by different openings of IGV and BOV To complete, when the opening of the IGV is large, the BOV may open the pressure relief to achieve the stability of the outlet pressure, causing the unit to run in the air without saving energy. When the BOV is fully closed, if the gas consumption device is under pressure or the load drops, resulting in a significant drop in gas consumption, the BOV of the compressor may be opened to release the pressure, which will also cause th...

Claims

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Application Information

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