초록 ▼

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 temper

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.

대표청구항 ▼

Apparatus for controlling interstage liquid injection into a fluid flowing in a multi-stage compressor, comprising: means for measuring a fluid pressure in said interstage; means for calculating a saturation temperature of said fluid based on said fluid pressure and, control means effective to contr

Apparatus for controlling interstage liquid injection into a fluid flowing in a multi-stage compressor, comprising: means for measuring a fluid pressure in said interstage; means for calculating a saturation temperature of said fluid based on said fluid pressure and, control means effective to control a flow rate of said liquid injection at an upstream end to a value which reduces a temperature of said fluid at a downstream end of said interstage to a predetermined amount above said saturation temperature. A method for controlling interstage water injection into a steam flowing in a multi-stage compressor, comprising: measuring a pressure of steam in said interstage; calculating a saturation temperature of said steam based on said pressure; and controlling a flow rate of said water injection at an upstream end to a value effective to reduce a temperature of said steam at a downstream end of said interstage to a predetermined amount above said saturation temperature.