Volume control method for multistage centrifugal compressor

Abstract

The invention provides a volume control method for a multistage centrifugal compressor, in the volume control method of the multistage centrifugal compressor provided with inlet guiding blades disposed at a suction part in each stage of the multistage centrifugal compressor, a ratio of the angle of the inlet guiding blades in each stage relative to an angle of referential inlet guiding blades are controlled, making each stage be at a preset fixed ratio. Further, the fixed ratio in every stage is set to become smaller with the rear stage directing toward a downstream side. According to the volume control method for the multistage centrifugal compressor, pressure wave can be prevented via simple and effective control of the inlet guiding blades, and operation range is enlarged via enlargement of throttling range of volume.

Description

technical field [0001] The present invention relates to a capacity control method of a multi-stage centrifugal compressor having inlet guide vanes provided at the suction portions of each stage of the multi-stage centrifugal compressor, and more specifically, to a simple control method capable of utilizing the above-mentioned inlet guide vanes A capacity control method for multi-stage centrifugal compressors to avoid pressure waves and expand the operating range. Background technique [0002] In various equipment such as chemical equipment, multi-stage centrifugal compressors are used for the compression of raw material air, air sources for manufacturing plants, and various high-pressure gas sources. In the multi-stage centrifugal compressor that has a suction pipe for sucking gas on the suction side of the compressor body, an inlet guide vane has been provided at the inlet of the suction pipe as a capacity control mechanism that changes the flow rate and pressure without ch...

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Problems solved by technology

[0010] for Figure 9 The capacity control device in the multi-stage compressor of the refrigerator in the prior art controls the suction vanes 24, 33 of the low-pressure section and the high-pressure section to have the same opening degree when adjusting the flow

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