Multiple-capacity centrifugal compressor and control method thereof

摘要

The present disclosure relates to a multiple-capacity centrifugal compressor, which includes a plurality of capacity-control mechanisms. Each of the capacity-control mechanisms includes an inlet guide vane and an outlet diffuser, so that the multiple-capacity centrifugal compressor provides a flexible control strategy. In addition, the present disclosure further provides a method for controlling the multiple-capacity centrifugal compressor that effectively adjusts and controls the capacity-control mechanisms by coarsely adjusting the inlet guide vanes and combined with subsequently adjusting the outlet diffusers.

主权项

1. A multiple-capacity centrifugal compressor, comprising:
a plurality of capacity-control mechanisms each of which includes an inlet guide vane and an outlet diffuser; and a controller that calculates a pressure ratio of a pressure of the outlet diffuser to a pressure of the inlet guide vane of each of the capacity-control mechanisms based on the pressure of the inlet guide vane and the pressure and a temperature of the outlet diffuser, compares changes in the pressure ratios of the capacity-control mechanisms to determine control priority for the capacity-control mechanisms, and adjusts the inlet guide vane and outlet diffuser of the each of the capacity-control mechanisms based on the control priority, to control the plurality of capacity-control mechanisms, wherein the control priority for the capacity-control mechanisms includes an adjusting order and an adjusting level of the capacity-control mechanisms.