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针对CO_2管道放空过程管内参数变化的研究较少,且相关规范对放空无明确要求的问题,分析了CO_2管道泄压过程的特殊性,通过建立管内瞬变过程的数学模型,计算了不同输送压力和泄放速率对放空特性的影响。研究表明:管存量随时间的变化规律呈幂函数形式;高压低温会延长放空时间;各相态CO_2在放空过程中存在共同的“相态汇聚区域”;密相CO_2的放空规律与液态CO_2相似;超临界放空将生成干冰;同时,放空速率对管内温降影响不大,但更小的放空速率导致更小的温降速率。因此,建议采用减缓放空阀开启速率、放空管局部加热等措施,实现对设备的保护和防止冰堵的发生。研究成果可为CO_2管道的放空方案以及相关规范的制定提供指导。
There are few researches on the change of parameters in CO 2 pipe venting process, and the relevant norms have no clear requirements for venting. The particularity of CO 2 pipeline venting process is analyzed. By setting up mathematical model of transient process in pipe, And the effect of bleed rate on venting characteristics. The results show that the variation law of tube stock with time is in the form of power function; the high pressure and low temperature prolong the venting time; the common phase state of CO_2 in venting phase exists in each phase; CO_2 is similar; supercritical venting will generate dry ice; meanwhile, the venting rate has little effect on the temperature drop in the tube, but the smaller venting rate results in a smaller temperature drop rate. Therefore, it is recommended to slow down the vent valve opening rate, vent pipe partial heating and other measures to achieve the protection of equipment and prevent the occurrence of ice blocking. The research results can provide guidance for the venting scheme of CO 2 pipeline and the establishment of relevant norms.