摘要
CO2在通过安全阀的排放过程中，形成的固体CO2在安全阀下游管道突扩处沉积，导致管路的堵塞和冻结，危害被保护系统的安全．为了寻求减少固体CO2在安全阀下游管道突扩处的沉积量和进一步避免管道堵塞的方法，利用拉格朗日模型对CO2气固两相紊流在突扩管内的流动和沉积特性进行计算，通过比较沉积率计算值与实验值，验证了计算结果的合理性；利用该模型分析了各种流动参数对流动和沉积特性的影响．结果表明，通过安全阀开启排放过程中生成的固体颗粒直径尽可能远离颗粒回流量的峰值区域（即颗粒直径0．04～0．07mm，St数为3．2～9．8的区域），可以降低固体CO2的沉积量，从而避免管道的堵塞和冻结．具体可以通过设计适当的安全阀开启时最小流通截面面积做到．
Freezing and blockage will occur during releasing CO2 through safety valves, which will further endanger protected equipments. This problem results from the deposition of formed solid CO2 at a sudden expansion of the downstream pipe of safety valve. In order to find methods to overcome this problem, the characteristics of the CO2 gas-solid sudden expansion flow were studied by using the disperse Lagrangian model. The calculated deposition of the solid CO2 was compared with the experimental results, and they are in reasonable agreement. The simulation results show that the size of the formed solid CO2 should not be in the range of 0.04-0.07 mm （St number 3.2-9. 8）, in order to avoid the freezing and blockage problem. It can be realized with an appropriate flow cross section of the safety valve.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2007年第3期419-423,共5页
Journal of Shanghai Jiaotong University
关键词
二氧化碳
安全阀
突扩
气固两相流
沉积率
carbon dioxide （CO2）
safety valve
sudden expansion
gas-solid flow
deposition
