我厂以常压四线油为原料生产皂蜡和精白蜡,原来采用皿式发汗,排管水平方向管心距为70～80mm,管壁距为45～55mm,垂直法向管距为125～175mm。由于石蜡传热速率小,排管间距大,皿内温度分布不均匀,冷却时常产生夹心现象,升 I plant to atmospheric pressure four-line oil as raw materials to produce soap wax and refined white wax, the original use of the dish-type sweat, horizontal drainage tube centering distance of 70 ~ 80mm, wall spacing 45 ~ 55mm, vertical tube to 125 ~ 175mm. Owing to the low heat transfer rate of paraffin, the large spacing between the pipes and the uneven temperature distribution in the dish, the phenomenon of sandwiching often occurs during cooling.