摘要
基于压降经验关联式，对CO2通过安全阀排放流动进行理论研究，分析安全阀的工况和管道结构参数对固体CO2形成的影响．结果表明：当安全阀进出口管径与孔径比为1．1～2．0，安全阀阀杆总上升高度与孔径比为0．1～0．4，下游管径与孔径比为4，下游管长与孔径比为1000时，固体CO2会在安全阀内形成；当安全阀开度大于70％且进出口管径与孔径比小于1．4，或安全阀上游进口压力高于12MPa时，固体CO2会在下游管路中形成．
CO2 refrigerating systems work under very high pressure. Normally safety valves are installed to avoid overpressure. But the blockage of the releasing path due to the formation of solid CO2 may endanger the entire system. Thus theoretical calculations were made to determine the geometrical and thermodynamic conditions for the formation of solid CO2. The empirical calculations of pressure drop along the releasing path show that： ① solid CO2 may mostly be formed in the safety valve house, when the range of the geometry parameters ratio of the in-and outlet diameter to the bore diameter is 1.1-2.0, the ratio of total lift of the safety valve to the bore diameter is 0.1-0.4, the ratio of the downstream diameter to the bore diameter is 4 and the ratio of the downstream pipe length to the bore diameter is 1 000; and② solid CO2 may be formed in the downstream line, if the valve opening is larger than 70%, and at the same time the ratio of the in-and outlet diameter to the bore diameter is less than 1.4 or the inlet pressure is higher than 12 MPa.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2008年第3期445-448,452,共5页
Journal of Shanghai Jiaotong University
关键词
制冷系统
安全阀
二氧化碳
压力计算
refrigeration system
safety valve
carbon dioxide
pressure estimation
