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.
在降温过程中，盐渍土中水分向冷端迁移，易溶盐亦随之向土体冷端迁移；土壤溶液中的硫酸钠呈水合芒硝析出，因而使土体盐胀。
In the process of lowing the temperature, both the water and the easy soluble salt move to the cold end in the soil body.
在降温过程中，盐渍土中水分向冷端迁移，易溶盐亦随之向土体冷端迁移；土壤溶液中的硫酸钠呈水合芒硝析出，因而使土体盐胀。
In the process of lowing the temperature, both the water and the easy soluble salt move to the cold end in the soil body.
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