Effect of Operating Conditions on the Performance of Gas–Liquid Mixture Roots Pumps

Qing Guo, Kai Luo, Daijin Li, Chuang Huang and Kan Qin
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Qing Guo: School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
Kai Luo: School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
Daijin Li: School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
Chuang Huang: School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
Kan Qin: School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China

Energies, 2021, vol. 14, issue 17, 1-23

Abstract: The performance of the gas–liquid mixture Roots pump at different operating conditions is investigated in this paper. The pump efficiency was first increased from 48% to 64%, and then decreased to 59% with the increased inlet CO 2 volume fraction (from 0.8 to 1). The increased rotational speed (from 1000 rpm to 4000 rpm) and pressure ratio (from 2 to 10) can lead to a reduction in the pump’s efficiency from 67% to 43% and from 48% to 33%, respectively. The variation in the pump’s efficiency is affected by the volumetric efficiency and the flow efficiency simultaneously. The high pressure and the CO 2 volume fraction in the outlet zone can increase the leakage, leading to a reduction in the volumetric efficiency. The flow efficiency decreases with the increase in the local pressure at the outlet zone and the backflow density. The outlet zone pressure can also affect the fluid properties by changing the density of the gas phase. Therefore, the combined effect of the outlet zone pressure and the working fluid properties is considered to be the main factor affecting the performance. This paper further explores the suitability of Roots pumps for compressing gas–liquid mixtures.

Keywords: Roots pump; multiphase flow; computational fluid dynamics; energy systems (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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