Abstract：Centrifugal compressors for transporting nature gas are usually with dry gas seals and applied in high pressure condition, thus generally the natural gas has to be used as lubricant of the seals. Under a high pressure condition, as a mixed real gas, the behavior of natural gas is quite different from that of ideal one. In this paper, the Redlich-Kwong equation was used to express the behavior of a mixed real gas, and the gas film pressure governing equations proposed by Muijderman for narrow grooves were modified and solved. Finally, based on various models for natural gas, influences of mixed real gas on the gas film pressure, leakage rate, film stiffness and opening force in a spiral groove dry gas seal was studied. Moreover, a comparison was made in sealing performance among the real natural gas, ideal natural gas case and methane(real gas and ideal gas). Results showed that the susceptibly compressed mixed real gas(Z<1)increased the leakage rate, pressure at the groove root, opening force and film stiffness, especially for the leakage rate. Although most component of the natural gas was methane, the sealing performance of natural gas was significantly different from that of methane gas. It was improper that the performance of dry gas seals in a centrifugal compressor for transporting natural gas was analysed by using methane gas only.
孙雪剑, 宋鹏云. 输送天然气离心式压缩机干气密封性能分析[J]. 排灌机械工程学报, 2018, 36(1): 55-62.
SUN Xuejian, SONG Pengyun. Analysis on performance of dry gas seal in centrifugal compressor for transporting natural gas. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(1): 55-62.
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