Effect of pressure control strategy on performance of thermodynamic vent system for storage tank

doi:10.11949/j.issn.0438-1157.20170679

Abstract

Abstract:

Thermodynamic vent system (TVS) is deemed as an efficient pressure control technique for long-term on-orbit storage of cryogenic propellants through fluid mixing and a combination of throttling and heat exchanging before venting. Three control strategies have been proposed to automate the mixing mode and venting mode of the TVS. The effects of these control strategies on liquid temperature, stratification and mass loss are investigated on a TVS simulator, which works at room temperature with R141b as the working fluid. The results show that the TVS can not only achieve a significant vent loss but also lower liquid temperatures and weaker stratification when one of the strategies is applied whose mixing mode operates based on ullage pressure and the vent mode is controlled based on both the ullage pressure and the bulk liquid temperature. This investigation provides guidance for the design and operation of cryogenic TVS.

Key words: propellant storage, phase change, thermodynamic vent, control strategy, pressure control

摘要：

热力排气系统（TVS）是通过流体混合与节流换热排气双重作用实现低温推进剂在轨长期贮存的一种有效的压力控制技术。针对TVS的混合模式和排气模式提出了3种运行控制策略。在以R141b为气液相变贮存介质的室温温区TVS模拟装置上，研究了这3种控制策略对TVS作用下的贮箱内液体温度、热分层以及排气损失的影响。结果表明，当采用基于气枕压力运行混合模式，并且同时基于液体温度对应的饱和压力和气枕压力运行排气模式这一控制策略时，TVS不仅可以实现最小的排气损失，也可实现较低的液体贮存温度和较小的热分层。为今后低温TVS系统的控制设计和实际运行提供了指导。

关键词: 推进剂贮存, 相变, 热力排气, 控制策略, 压力控制

CLC Number:

V511.6

HUANG Yonghua, CHEN Zhongcan, WANG Bin, LI Peng, SUN Peijie. Effect of pressure control strategy on performance of thermodynamic vent system for storage tank[J]. CIESC Journal, 2017, 68(12): 4702-4708.

黄永华, 陈忠灿, 汪彬, 李鹏, 孙培杰. 控制策略对贮箱热力排气系统性能的影响[J]. 化工学报, 2017, 68(12): 4702-4708.

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