A new type of onboard LNG drip tray with foam glass blocks as thermal insulation layer was designed. In order to have a full picture of the thermal insulation performance, a set of experiments was conducted. Liquid nitrogen (LN2) was used as a safer analogue of LNG. To verify the feasibility in using LN2, the vaporization characteristics of LNG and LN2 was compared in same environmental conditions. The results showed that the vaporization rate of LNG was lower than of LN2, but the change of temperature and vaporization rate of LNG is quite different from that of LN2. According to the phenomenon in the experiment, vaporization characteristics of LNG were analyzed, and the feasibility of using LN2 in place of LNG was proved. Two models were designed, and corresponding thermal insulation performance experiments were conducted. The insulation layer thickness of the model 1 was 50cm, and that of model 2 was 30cm. Calculations of convective heat transfer showed that both models could meet thermal insulation requirement. For model 1, the experiment duration was about 14h, and for model 2, the experiment duration was approximately 23h. Experiments results showed that both models could meet thermal insulation requirement. The model 2 with a thin insulating layer (30cm) were recommended, but special laying requirements of the foam glass blocks should be considered.%设计了一种新型船用液化天然气（LNG）泡沫玻璃砖承接池。为了掌握其隔热性能，从安全角度考虑，采用液氮（LN2）作为试验介质进行承接池隔热性能试验。在相同环境条件下对比LNG和LN2的自然蒸发特性。结果表明，LNG的自然蒸发速度低于LN2，且蒸发过程的温度变化、蒸发速率变化等特性与LN2差异较大。根据试验现象，分析混合液体 LNG 蒸发特性的特殊性，验证了使用 LN2作为试验介质的可行性。承接池隔热性能试验模型的隔热层采用50cm（方案1）和30cm（方案2）两种方案，并进行了有限元对流传热计算。计算结果显示两个模型均可达到隔热要求。方案1的试验持续时间约为14h，方案2的试验持续时间约为23h。试验结果表明，隔热层厚度较薄的方案2已能满足船体钢结构的隔热要求，但应注意隔热层泡沫玻璃砖的铺设规范。
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