| 摘要 |
<p>Liquid injection into the interstage steam flow in a multi-stage compressor is controlled by calculating a saturation temperature of the fluid in the interstage and then controlling the liquid flow to reduce the incoming fluid temperature to a value a predetermined amount above the saturation temperature. In one embodiment, the fluid temperature is measured at the downstream end of the interstage conduit after it has been reduced by liquid injection. This measured temperature is used to compare with the calculated saturation temperature to determine whether to increase or decrease the liquid injection flow. In another embodiment of the invention, the fluid temperature is measured upstream of the liquid injection point. This measured fluid temperature is employed with a measured fluid mass flow rate and the calculated saturation temperature to calculate a desired liquid injection flow rate to reduce the temperature measured at the inlet to the desired amount of superheat at the entry to the following compressor stage. A measurement of the flow of injected liquid is compared with the calculated desired liquid flow to determine whether the injection liquid flow rate should be increased or decreased.</p> |
