[논문]Development and performance test of a liquid nitrogen circulation pump for HTS power cable

Seok, Jihoon; Kim, Dongmin; Lee, Changhyeong; Kim, Manryeol; Choi, Jeongdong; Kim, Seokho

doi:10.9714/psac.2018.20.3.028

Development and performance test of a liquid nitrogen circulation pump for HTS power cable 원문보기

Progress in superconductivity and cryogenics : PSAC, v.20 no.3, 2018년, pp.28 - 33

Seok, Jihoon (Changwon National University) , Kim, Dongmin (Changwon National University) , Lee, Changhyeong (Changwon National University) , Kim, Manryeol (OZ INDUSTRY) , Choi, Jeongdong (Hi-tech) , Kim, Seokho (Changwon National University)

Abstract ▼ AI-Helper

With the continuous performance improvement and commercialization of HTS wires, there have been many efforts to commercialize HTS power cables recently. Unlike conventional power cables, a cryogenic cooling system is required for a HTS power cable and a cryogenic pump is one of the essential components to circulate subcooled liquid nitrogen and cool the HTS power cable. Especially, the development of a reliable and high-efficiency cryogenic pump is an important issue for the commercialization of HTS power cables of several kilometers or more. In this study, we designed and fabricated a cryogenic pump for subcooled liquid nitrogen with a mass flow rate of 1.2 kg/s, a differential pressure of 5 bar, and evaluated the hydraulic performance of the pump. Impeller design was conducted to meet the target design performance with 1 D analysis model and CFD analysis. The pump performance parameters such as pressure heads, mass flow rates, and efficiencies in accordance with rotating speeds were assessed using a laboratory's performance evaluation system.

주제어

표/그림 (15)

그림 Fig. 1. n_s - d_s diagram for single stage pumps [13].
그림 Fig. 2. Velocity diagram of centrifugal pump [13–15].
표 TABLE 1 DESIGN SPECIFICATIONS AND DESIGN RESULTS OF IMPELLER.
그림 Fig. 3. 3D CFD model for flow analysis.
그림 Fig. 4. CFD analysis results of (a) total pressure and (b) velocity distribution and vectors at 50 % span of impeller vane (9,000 rpm, 1.2 kg/s).
그림 Fig. 5. Analysis results of differential pressures and efficiencies for mass flow rates from 1.0 to 1.6 kg/s at 9,000 rpm.
그림 Fig. 6. Shaft modal analysis result – 1^st bending mode at 238.9 Hz, 2^nd bending model at 2214.4 Hz.
그림 Fig. 7. Variation of maximum displacement by harmonic analysis.
표 TABLE 2 FLOW ANALYSIS PARAMETERS OF IMPELLER AND VOLUTE.
그림 Fig. 8. (a) 3D drawing of cryogenic pump and main components, (b) fabricated pump installed the performance test facility.
그림 Fig. 9. P&ID performance test facility of cryogenic pump.
그림 Fig. 10. Cryogenic pump installed at the performance test facility.
그림 Fig. 11. Temperatures and pressure difference between pump inlet and outlet according to change of mass flow rate.
그림 Fig. 12. Experimental results on the rotational vibration characteristics of the axis (a) 9,000 rpm, (b) 10,500 rpm, (c) 12,000 rpm.
그림 Fig. 13. Test results of differential pressure and efficiency by mass flow rate.

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제안 방법

In addition, a harmonic analysis was performed with the shaft having mass unbalance of G6.3 grade balance and eccentric force of 4.2 N by flow discharge to verify if the maximum displacement of the shaft is within the designed shroud clearance. According to the harmonic analysis in Fig.

이론/모형

2 kg/s and pressure difference of 5 bar, which is applicable for HTS power cables of several kilometers or more. To satisfy the pump performance, the impeller and volute were designed and the hydraulic performance was investigated using CFD (Computational Fluid Dynamics) analysis. After fabricating the pump, its performance such as pressure heads, mass flow rates and efficiencies were assessed using a laboratory’s cryogenic pumps test facility.

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