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Improvements in compressors control

A technology for compressors, centrifugal compressors, used in pump control, mechanical equipment, machines/engines, etc., to solve problems such as suboptimal operation, excessively limited allowable flow range of the compressor, etc.

Active Publication Date: 2011-07-13
GARDNER DENVER DOJCHLAND GMBKH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main disadvantage of these methods is that once surge has been detected, the compressor is shut down and operator intervention is required to bring the compressor back online
The disadvantage of this method is that the allowable flow range of the compressor is unduly restricted and its operation is not optimal

Method used

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Examples

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Embodiment Construction

[0027] The surge line of the compressor is determined by the delivery pressure P d and the flow rate Q is pre-defined, such as figure 1 shown. Delivery pressure P d is the pressure of the compressed air measured at the outlet of the compressor. For any given delivery pressure P d , the operating range for flow rate Q used in prior art systems is below a safety margin, designed to cover all expected operating conditions. As mentioned earlier, this results in a loss of ideal operating range, especially since compressor efficiency will be optimal near the surge line.

[0028] In the method of the present invention, a control system is used to control compressor operation, unlike prior art systems which periodically allow the surge cycle of the compressor to start. Thus, instead of relying on the prediction of the surge point for a fixed set of operating conditions, the actual surge point is known for the current actual operating conditions, and this is used as the basis for ...

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PUM

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Abstract

The invention relates to improvements in compressors and, in particular, to improvements in a method of controlling centrifugal compressors to maximise their efficacy. The compressor has an impeller mounted on a shaft supported by an active magnetic bearing unit and is driven by a variable speed motor at a rotational speed under normal on-load conditions at a calculated pre-surge speed for the required delivery pressure. The actual rotational speed and delivery pressure of the compressor is repeatedly measured and recorded at high frequency. The compressor is allowed to surge periodically after a preset re-calibration time and the compressor is put into a surge recovery cycle when surge is detected, during which the compressor is off-loaded and the rotational speed reduced. The compressor pre-surge speed line is recalibrated during the surge recovery cycle for the current operating conditions and reloads the compressor when the shaft speed reaches the greater of the recalibrated presurge speed line or the load speed.

Description

technical field [0001] This invention relates to improvements in compressors, and more particularly to improvements in the method of controlling centrifugal compressors to maximize their efficiency. Background technique [0002] The operating characteristics of a compressor are generally defined by the relationship between pressure ratio and volume or mass flow rate. Its useful operating range is limited by the surge and clogging that ideally should be avoided, and the maximum allowable compressor speed. [0003] Compressor surge occurs when the discharge pressure is greater than the pressure inside the compressor such that the airflow can no longer stick to the suction side of the compressor blades and the discharge process is interrupted. During surge, the gas flow through the compressor is reversed until a stable pressure ratio with a positive volumetric flow rate is reached. Normal flow resumes until pressure is re-established and the cycle repeats. [0004] Surge is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/02
CPCF04D27/02F04D27/0261F04D27/0284Y02B30/70F04B49/06
Inventor G·G·鲍威尔
Owner GARDNER DENVER DOJCHLAND GMBKH
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