Abstract:

Experiments on the tank pressure, evaporation volume and evaporation rate were carried out in a closed tank with LNG (liquefied natural gas).The results show that there exists a non-uniform temperature field, where the temperature in gas phase is higher than that at gas-liquid interface, and the temperature at gas-liquid interface is higher than that in the bulk phase of liquid.Under the experimental conditions, the maximum temperature difference among the above three parts is about 2—3℃ when the initial filling rate is 0.475.There exits a critical initial filling rate.When the initial filling rate is lower than the critical value, the daily evaporation volume and evaporation rate increase with time; when the initial filling rate is larger than the critical value, they first increase with time and then decrease.

Key words:

LNG储存, 蒸发率, 临界充满率, 密闭储罐

摘要：

以LNG(液化天然气)为介质、以密闭LNG生产储罐为对象进行了储罐的压力及日蒸发气体量及蒸发率测试实验，结果证明：密闭LNG储罐内的温度场是非均匀的，即气相部分温度高于气液分界面处温度、气液分界面处液体温度高于液相主体的温度;在实验条件下，当初始充满率为0.475时，3部分的温差最大约为2～3℃。存在临界初始充满率，即当初始充满率小于临界充满率时，某一充满率下的日蒸发气体量和蒸发率随时间而增大;当初始充满率大于临界充满率时，某一充满率下的日蒸发气体量和蒸发率先随着时间增加而增大，然后又随着时间的增加而减小。

关键词:

LNG储存, 蒸发率, 临界充满率, 密闭储罐