【摘要】 在确定不锈钢在液氮中沸腾换热系数的基础上,结合其在低温下的物性参数,利用有限元分析软件ANSYS对一低温阀门在正常运行和冷态试验状态下的温度场进行模拟与分析。针对冷态试验情况下填料函处出现冻结的问题,提出在阀杆处添加绝热层的方案,继而通过进一步的模拟计算预测了其改进效果。更多还原

【Abstract】 Based on the heat transfer coefficient of stainless steel emerged in liquid nitrogen,obtained from experiential equations and revised with experimental measurement,numerical simulation has been carried out on a cryogenic valve to analyze its dynamic heat transfer characteristics under cryogenic tests.The analysis focuses on the cool-down temperatures at four locations on the valve,i.e.,inner surface,outer surface,valve clack and top of packing gland.In order to avoid the temperature at the top of packing gland reaching as low as 0 ℃,and then the occurrence of freezing,an insulating layer is proposed to be attached to the valve stem section inside low temperature nitrogen gas.Further simulation has also been done to predict the effect of the addition of insulating layer.更多还原