BEPCⅡ超导腔液氦控制杜瓦非稳态供液过程的建模及仿真  

Modelling and Simulating on the Liquid Helium Discharge Process from Dewar of SRF Cooling System in BEPCⅡ

作　　者：马晨晖[1] 徐风雨[1] 王莉[1] 杨光达[1] 

机构地区：[1]哈尔滨工业大学低温与超导技术研究所,黑龙江哈尔滨150080

出　　处：《节能技术》2006年第3期204-208,共5页Energy Conservation Technology

基　　金：BEPCⅡ重大改造项目低温系统工程设计(EDQQ25500317)资助

摘　　要：本文针对北京正负电子对撞机重大改造项目(BEPCⅡ)中的超导腔冷却系统,得到了制冷机停机工况下供液杜瓦非稳态供液过程数学模型。其中压力模型的建立利用了气液两相氦的物性参数与饱和压力的对应关系。采用所得计算模型,根据实际条件计算得到了气液两相氦的质量和压力随时间的变化情况,提出了利用电加热器来调节杜瓦压力的方法。最后,设计了制冷机停机工况下液氦杜瓦的压力控制系统并进行了动态仿真。A numerical model for the liquid helium discharge process from control dewar is presented, which is under shut - down condition of the SRF cooling system in Beijing Electron - Positron Collider Upgrade（ BEPC Ⅱ ）. The pressure model is established by considering the relations of properties of two - phase helium with the corresponding saturated pressure. The simulation for the real case is performed. The variations of the mass flow and the pressure of the helium in the dewar with the time are obtained. The method by using electric heater to control the dewar pressure is presented. The control system for the pressure control in the helium dewar is designed and simulated.

关 键 词：液氦供液过程 建模 仿真 压力控制 

分 类 号：TB6[一般工业技术—制冷工程]