| 摘要 |
<p>Apparatus for crystallisation by evaporation, comprising a closed vessel, with a vertical axis, a bundle of heating elements consisting of annular bodies with hollow walls and arranged vertically and concentrically in the lower part of the vessel and a stirrer placed at the bottom of a central well arranged in the bundle. Apparatus of this type is employed especially in sugar manufacture and sugar refining. The apparatus forming the subject of the invention is characterised in that the heating elements (16) are arranged so that their upper edges are situated at levels which decrease from the periphery towards the centre of the bundle and in that the difference in level h between the upper edge of the outermost heating element, of larger diameter, and that of the inner heating element, of smaller diameter, is between 0.2 D<2/3> and D<2/3>, D being the diameter of the central well and h and D being expressed in metres. <IMAGE></p> |
