要不时地搅拌牛奶蛋糊，防止其表面结皮。
循环冷却水水质差是冷凝器表面结垢的主要原因。
The circulating cooling water of low quality is the primary reason for incrustation.
以减压渣油为燃料的常减压加热炉在长期生产运行过程中， 对流室钉头炉管表面结垢严重。
In the long-term operation of atmospheric and vacuum heat furnace that use vacuum heavy oil as fuel, thesurface of nailhead furnace tube in the convection chamber was seriously deposited.
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