结果表明，目前的二冷制度不甚合理，易产生内裂纹等质量缺陷。
The result reveals that the practical secondary cooling system is not suitable and easy to cause quality defects such as internal crack.
小型乙烯生产装置的往复式甲烷制冷压缩机出口气体中存在黑色粉尘，易进入冷箱造成堵塞，影响甲烷制冷并危及装置生产。
The black powder in the exit gas of methane compressor caused the plugging of coo ling box and resulted in the reduction of refrigeration effect.
加氢裂化反应流出物空冷器（简称REAC）管束属于特种设备，承受高压临氢多相流的冲蚀，易引发恶性事故。
The hydrocracking REAC pipes are special equipments, and easy to lead to serious accidents, for they suffer from the erosion of multiphase flow under the environment of high-pressure hydrogen.
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