大型LNG 储罐罐顶冷接管结露问题分析

针对大型LNG储罐罐顶冷接管的结露问题,以预应力混凝土全容式LNG储罐的顶部进料管为例开展分析研究工作,提出了一种基于罐顶冷接管局部温度场分析模型和储罐建设地气象条件的冷接管局部结露概率及程度的判断方法,并采用该分析模型对影响冷接管结露的一些参数进行了系列化分析研究。分析结果表明:建造地温度越高、湿度越大,罐顶冷接管越易结露;在一定范围内增加大气对流传热系数、增加保冷套管与大气环境接触的长度,能有效降低结露概率。

大型LNG储罐罐顶冷接管结露影响因素分析

针对大型LNG储罐罐顶冷接管的结露问题,以预应力混凝土全容式LNG储罐的顶部进料管为例,采用五因素四水平的正交分析法对罐顶冷接管局部结露问题的5个主要影响因素开展了定量分析,得到5个因素对结露问题影响作用的排序,从大到小依次为套管露出长度、对流传热系数、套管内保温层的厚度、大气环境温度和保冷套管的长度;在一定范围内增大套管露出长度、对流传热系数、套管内保温层的厚度,可以有效降低结露概率;冷接管的公称直径越大,越容易发生局部结露现象.

加氢反应器中冷氢接管有限元分析

利用ANSYS软件对加氢反应器中冷氢接管在耦合场下进行应力分析,得到冷氢口结构的热应力;同时结合压力载荷下的冷氢接管应力进行校核。

Design calculation of porous ceramics tube type dew point indirect evaporative cooler

To improve the wall surface hydrophilicity of a tube type indirect evaporative cooler,a new method adopting porous ceramics is proposed.This method realizes the combination of porous ceramics and the evaporative cooling technique.The design calculation of the porous ceramics tube type dew point indirect evaporative cooler are carried out from such aspects as the volumes and status parameters of the primary and secondary air,the cooler structure,the heat transfer of the solid porous ceramic tubes and the resistance of the cooler.The calculation results show that the design is reasonable.Finally,based on the design calculation,the porous ceramics tube type dew point indirect evaporative cooler is successfully manufactured.