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BOG压缩机是处理LNG储罐中闪蒸气(BOG)的关键设备。建立了有限元计算模型,得到了压缩腔壁面的稳态温度场,并以此为边界条件,采用动网格技术,模拟了进气过程中气缸内流场分布和温度分布。并搭建了试验台对理论模型进行了验证。结果表明:当BOG压缩机运行稳定后,其温度整体呈现由缸盖到曲轴箱单向递增的变化规律。温度系数随着进气温度降低而下降,进气温度低于-120℃时下降剧烈,高于-70℃后则趋于平缓。
BOG compressors are key equipment for handling flash gas (BOG) in LNG tanks. The finite element model is established and the steady-state temperature field on the wall of the compression chamber is obtained. Using the dynamic grid technique, the flow field distribution and temperature distribution in the cylinder during the intake process are simulated. And set up a test bench to verify the theoretical model. The results show that when the BOG compressor runs stably, the temperature of the BOG compressor shows a one-way incremental change from the cylinder head to the crankcase. The temperature coefficient decreased with the decrease of inlet air temperature. When inlet air temperature was lower than -120 ℃, the temperature dropped sharply, while the temperature coefficient was lower than -70 ℃.