CO2通过安全阀排放流动分析.pdf

第42卷第3期
上海交通大学学报
Vol 42 No. 3
08年
JOURNAL OF SHANGHAI JIAOTONG UNIVERSITY
Mar.2008
文章编号:1006-2467(2008)03-0445-04
CO2通过安全阀排放流动分析
黄冬平12,丁国良1, RUACK Hans2
(1.上海交通大学制冷与低温工程研究所,上海200240;
2.徳累斯顿技术大学制冷与低温技术教研室,德国德累斯顿01069
摘要;基于压降经验关联式,对CO2通过安全阅排放流动进行理论研究,分析安全网的工况和
管道结构参数对固体CO2形成的影响.结果表明:当安全阅进出ロ管径与孔径比为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;当安全阅开度大子70%且进出口管径与孔径比小于1.4,或安全阅
上游进口压力高于12MPa时,固体CO2会在下游管路中形成
关键词:制冷系统;安全;二氧化碳;压力计算
中图分类号:TB664
文献标识码:A
Analysis of CO Flowing Process in the Safety
Valve and Its Downstream Line
HUANG Dong-ping", DING Guo-liang, QUACK Han
(1. Institute of Refrigeration and Cryogenics Engineering, Shanghai Jiaotong University,
Shanghai 200240, China; 2. Professorship of Refrigeration and Cryogenics
Technical University of Dresden, Dresden 01069, Germany
Abstract 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 thermodynam-
ic conditions for the formation of solid CO2. The empirical calculations of pressure drop along the releasing
path show that: O solid CO may mostly be formed in the safety valve house, when the range of the geom
etry 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. 10.4, the ratio of the downstream diameter to the bore diame-
ter is 4 and the ratio of the downstream pipe length to the bore diameter is 1 000; and solid CO2 may be
formed in the downstream line, if the valve opening is larger than 70%, and at the same time the ratio o
the in-and outlet diameter to the bore diameter is less than 1.4 or the inlet pressure is higher than 12 Mpa.
Key words: refrigeration system; safety valve; carbon dioxide; pressure estimation
收稿日期;2006-11-12
作者简介:黄冬平(1978-),女,潮北荆州人,博士,主要研究方向为二氧化碳制冷系统性能和安全性能.丁国良(联系人),男,教授,
博士生导师,电话(Tel.);021-34206378;E-mail:glding@situ,edu.cn,
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