| 摘要 |
PCT No. PCT/SE86/00272 Sec. 371 Date Jan. 23, 1987 Sec. 102(e) Date Jan. 23, 1987 PCT Filed Jun. 6, 1986 PCT Pub. No. WO86/07416 PCT Pub. Date Dec. 18, 1986.An oil-free rotary gas-compressor system includes an oil-free rotary gas-compressor (2) having a high, built-in pressure ratio and an injector arrangement (13) for injecting a vaporizable liquid, preferably water, into the compressor (2) for cooling the gas during the compression process. It is known in high-speed compressors to utilize water injection which is so restricted that the water is completely vaporized, to thereby obtain a good cooling effect. The efficiency of the compressor is limited, however. In known systems, high compressor efficiencies are obtained by injecting large quantites of water, although the compressor speed must then be considerably reduced, resulting in a lower compressor capacity. According to the present invention, a correspondingly high efficiency can be obtained, however, in a high-speed compressor when the water is injected into the compressor in a weight quantity which is greater than the maximum amount of liquid permitted for obtaining a complete vaporization of the liquid during the compression of the gas up to an amount that is four times greater than said maximum amount. |
