Servo valve endurance test for water-hydraulic systems in ITER-relevant conditions
Servo valve endurance test for water-hydraulic systems in ITER-relevant conditions
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DOI：
10.1016/j.fusengdes.2019.04.033
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发表时间：
2019-09
影响因子：
1.7
通讯作者：
Liisa Aha;J. Väyrynen;J. Tammisto;J. Mattila;S. Esqué;Rob Sharratt
中科院分区：
文献类型：
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作者：
Liisa Aha;J. Väyrynen;J. Tammisto;J. Mattila;S. Esqué;Rob Sharratt
ITER偏滤器维护设备在高温和相当大的辐射负荷下在真空室中运行。重型偏滤器组件使用伺服阀系统(如盒式多功能移动器(CMM))提升和运输。系统由水液压驱动，使用脱盐水作为压力介质。没有在与热核实验堆有关的环境条件和超过预计占空比的情况下对业务进行测试。由于液压介质具有很强的侵略性，而且没有为脱盐水设计的伺服阀，因此超过2000小时的运行时间被认为是一个潜在的问题。因此，开展了一个项目，以确定部件与环境和压力介质的兼容性，以及它们在所需运行期内的坚固性。在技术验证的这一阶段，不考虑部件的辐照。建造了一个加热试验室，以模拟偏滤器区域预计的最高环境温度50 °C。测试程序和测量是专门为监控伺服阀的运行参数量身定做的。经过2188-h测试后，伺服阀参数保持在制造商承诺的范围内。压力增益降低，滞后增加，但仍在允许的范围内。这些变化对关节角度跟踪误差没有显著影响。
ITER Divertor maintenance equipment operates in the vacuum vessel in elevated temperature and under considerable radiation load. The heavy Divertor assemblies are lifted and transported using servo valve systems, such as Cassette Multi-functional Mover (CMM). Systems are powered with water hydraulics, using demineralized water as a pressure medium. Operations have not been tested in ITER-relevant environmental conditions and over projected duty cycles. As the hydraulic medium is rather aggressive and there are no servo valves designed for demineralized water, the greater than 2000-h operational time was considered a potential issue. Hence, a project was undertaken to ascertain the component compatibility with the environment and pressure medium, and their robustness over the required operational period. Irradiation of components was not considered at this phase of technology validation. A heated test chamber was constructed to emulate the projected maximum ambient temperature of 50 °C in the Divertor area. Test routines and measurements were specifically tailored to monitor the operational parameters of the servo valve. After the 2188-h test the servo valve parameters remained within the limits promised by the manufacturer. Pressure gain decreased and hysteresis increased but remained within the allowable limits. These changes did not have significant effect on the joint angle tracking error.