什么是降膜管换热器?与普通的换热器存在哪些不同? falling film evaporator or falling film chiller falling film evaporator the liquid to be evaporated is evenly distributed on the inner surface of a tube (see page 39). the liquid will flow downwards forming a thin film, from which the boiling/evaporation will take place because of the heat applied by the steam. see fig. 3. the steam will condense and flow downwards on the outer surface of the tube. a number of tubes are built together side by side. at each end the tubes are fixed to tube plates, and finally the tube bundle is enclosed by a jacket, see fig. 3a. the steam is introduced through the jacket. the space between the tubes is thus forming the heating section. the inner side of the tubes is called the boiling section. together they form the so-called calandria. the concentrated liquid and the vapour leave the calandria at the bottom part, from where the main proportion of the concentrated liquid is discharged. the remaining part enters the subsequent separator tangentially together with the vapour. the separated concentrate is discharged (usually by means of the same pump as for the major part of the concentrate from the calandria), and the vapour leaves the separator from the top. the heating steam, which condenses on the outer surface of the tubes, is collected as condensate at the bottom part of the heating section, from where it is discharged by means of a pump. fig. 3 evaporation in a falling film evaporator tube查看更多
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