| 摘要 |
<p>The electric heating elements in the boiler of a distillation appts., esp. for water, are enclosed by a perforated cylindrical vessel, and are tubular with orifices through which liquid and vapour circulate, so as to render inner and outer surfaces effective in heating. Entrained liquid is removed from vapour by a filter, which may be of glass rings, and by a vertical cylindrical trap, which is concentric inside a perforated cylinder closed at the top, around which is wound the serpentine condensing coil, cooled by water preheated in the condensate cooler; part of this water is used as the feed to the boilers, to conserve heat.</p> |
