LNG罐式集装箱主要组成材料放气速率测试

Outgassing Rate Test of Main Components of LNG Tank Containers

维持高真空对采用多层绝热方式的低温储运设备的性能和寿命具有决定性影响。为准确表征LNG罐式集装箱的真空寿命,采用静态升压法测试LNG罐式集装箱4种主要组成材料(不锈钢、碳钢、玻璃钢和多层绝热材料)的放气速率并对其放气成分进行分析。结果表明:不锈钢(S30408)单位面积放气速率稳定值约为1.32×10^(-10) Pa·m^(3)/(s·cm^(2)),碳钢(Q345R)单位面积放气速率稳定值约为4.30×10^(-10) Pa·m^(3)(/s·cm^(2)),玻璃钢单位面积放气速率稳定值约为6.24×10^(-9 )Pa·m^(3)(/s·cm^(2)),多层绝热材料单位质量放气速率稳定值约为4.79×10^(-9 )Pa·m^(3)(/s·g)。通过对材料放气成分进行分析,多层绝热材料、不锈钢和碳钢的放气成分大部分为H_(2)O,玻璃钢主要的放气成分为N_(2)/CO、CO_(2)和C,碳钢和不锈钢释放的H_(2)明显多于玻璃钢和多层绝热材料。

Vacuum degree has a decisive influence on the performance and service life of cryogenic storage and transportation equipment with high vacuum multila yer insulation material.In order to accurately characterize the vacuum life of the LNG tank container,the outgassing rate of four main components of LNG tank containers(stainless steel,carbon steel,glass fiber reinforced plastics and multilayer insulation material)was measured by static pressure boosting method,and its deflation composition was analyzed.The result shows that the stable value of outgassing rate per unit area of stainless steel(S30408)is about 1.32×10^(-10) Pa·m^(3)/(s·cm^(2)),the stable value of outgassing rate per unit area of carbon steel(Q345R)is about 4.30×10^(-10) Pa·m^(3)/(s·cm^(2)),the stable value of deflation rate per unit area of glass fiber reinforced plastics is about 6.24×10^(-9 )Pa·m^(3)/(s·cm^(2)),the stable value of outgassing rate per unit mass of multilayer materials is about 4.79×10^(-9 )Pa·m^(3)/(s·g).By analyzing the outgassing components of materials,it is found that most of the outgassing components of tank materials are H_(2)O/OH,and the main outgassing component of glass fiber reinforced plastics is N_(2)/CO、CO_(2) and C.In addition,carbon steel and stainless steel release significantly more H_(2) than glass fiber reinforced plastics and thermal insulation materials.