Development and Application of Test System for Ball Joints of Parabolic Trough Solar Collector

doi:10.12096/j.2096-4528.pgt.23071

Abstract

Abstract:

The ball joint is a key component of a parabolic trough solar collector. To address the problems of operation sticking and heat conduction oil leakage in ball joints, a performance test system was developed. The system can perform accelerated life tests of ball joints in rotational, angular, or rotational-angular motion, and at temperature up to 393 ℃ and pressure up to 4.1 MPa. Using thermal conductivity oil as heat transfer fluid, performance tests of the ball joints were conducted under working conditions of 393 ℃ and 2.3 MPa, as well as under varying temperature and pressure conditions. The torque characteristics and sealing performance of the ball joint over a simulated 12-year lifespan were analyzed. Furthermore, the stability and reliability of the test system were verified through the test process, and the control and measurement accuracy of key technical parameters met the operational requirements. This test system provides technical support for the performance assessment of ball joints.

Key words: solar thermal power generation, parabolic trough solar collector, ball joint, test system, torque characteristic, seal performance, accelerated life, performance testing

CLC Number:

TK 513.1

Jun DONG, Jianfang TANG, Chuncheng ZANG, Li XU, Zhifeng WANG. Development and Application of Test System for Ball Joints of Parabolic Trough Solar Collector[J]. Power Generation Technology, 2024, 45(2): 291-298.

Figures/Tables 13

Fig. 1 Structure of ball joint

Fig. 2 Installation position of ball joint

Fig. 3 Schematic diagram of ball joint test system composition

Fig. 4 Schematic diagram of heat conduction oil adjustment device

Fig. 5 Temperature change of heat conduction oil

Fig. 6 Presure change of heat conduction oil

Fig. 7 Flow chart of measurement and control program

Fig. 8 Ball joint and its test system

Tab. 1 Torque test results of the ball joint under variable working conditions

类别

温度/压力

200 ℃/

1.0 MPa

250 ℃/

1.0 MPa

293 ℃/

1.0 MPa

293 ℃/

1.7 MPa

350 ℃/

2.1 MPa

393 ℃/

2.6 MPa

Fig. 9 Temperature of the tested ball joint

Fig. 10 Torque variation trend of ball joint

Fig. 11 Leakage change of heat conduction oil

Fig. 12 Torque change of the ball joint in the rotational-angular motion

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