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Evaporator falling-film type

Low-temperature evaporators of the falling-film type were heavily utilized in the citrus industry through the 1950 s and... [Pg.234]

Evaporators in commercial use include circulatory systems, shell and tube heat exchangers and falling film-type evaporators. The falling film evaporator has the advantages of a small working volume and a short residence time. All evaporators produce steam that must be purified, and some of the techniques mentioned above can also be applied to this steam103. [Pg.260]

Figure 11. Plate evaporator, rising/falling film type. (APVCompany, Inc.)... Figure 11. Plate evaporator, rising/falling film type. (APVCompany, Inc.)...
Multiple-Effect, Long-Tube Vertical (LTV) Distillation Process. This is a sea water conversion plant at Freeport, Tex., producing 1,000,000 gallons per day of fresh water. It has 12 effects the evaporators are of a falling film type. [Pg.5]

Although the methods proposed for scale control relate specifically to spray evaporation, the strippable film technique may well be applicable to other types of evaporator, and this requires further investigation. The other two methods are practicable as a result of the very low liquid holdup in spray evaporation, so that interruption of the feed leads to elimination of the holdup in a matter of seconds. The same process should be applicable to conventional evaporators of low holdup—e.g., long-tube climbing and falling film types—if entrainment steam were admitted at the same time as the feed is interrupted, and this possibility would well repay further investigation. [Pg.69]

The main problem in designing an apparatus of the falling-film type is to prevent channelling on the evaporating surfaces. The following measures have been adopted for this purpose ... [Pg.301]

Since membrane-cell evaporators do not produce solids, forced-circulation evaporators are used less frequently. Rising-film and falling-film types appear in a number of plants. The rising-film evaporator depends on natural circulation of caustic from the bottom to the top of the tubes. Falling-film evaporators, as shown in Section 9.3.S.2, depend on pumps to lift caustic to the distribution system at the top. These units generally have better heat-transfer coefficients and less tendency to foul. Recirculated units in particular allow good control of flow to maintain a proper film on the tubes. This also permits the designer to provide more turndown capability. Liquid velocities are lower... [Pg.980]

Fig. 3. Film-type evaporators (a) long-tube vertical, (b) falling film, and (c) horizontal tube. Terms are defined in Figure 1. M represents end view of (a). Fig. 3. Film-type evaporators (a) long-tube vertical, (b) falling film, and (c) horizontal tube. Terms are defined in Figure 1. M represents end view of (a).
FIG. 11-122 Evaporator types, a) Forced circulation, (h) Siibmerged-tiihe forced circulation, (c) Oslo-type crystallizer, (d) Short-tube vertical, (e) Propeller calandria. (f) Long-tube vertical, (g) Recirculating long-tube vertical, (h) Falling film, (ij) Horizontal-tube evaporators. G = condensate F = feed G = vent P = product S = steam V = vapor ENT T = separated entrainment outlet. [Pg.1138]

Major evaporator designs include forced-circulation, long-tube vertical (both rising and falling film), and calandria-type evaporators. The economics of a particular process will dictate the evaporator style and model best suited to a particular application. Forced-circulation and calandria evaporators are required for processes where crystals are formed. These evaporators are designed to keep crystals suspended in solution to prevent scaling of the equipment. Long-tube vertical evaporators are used to concentrate a liquid that does not have solids present. [Pg.95]

Heat transfer equipment has a great variation in heat transfer area per unit of material volume. Table 4.4 compares the surface compactness of a variety of heat exchanger types. Falling film evaporators and wiped film heat exchangers also reduce the inventory of material on the tube side. Process inventory can be minimized by using heat exchangers with the minimum volume of hazardous process fluid for the heat transfer area required. [Pg.71]

Figure 8.16. Some types of evaporators, (a) Horizontal tube, (b) Calandria type, (c) Thermocompressor evaporator, (d) Long tube vertical, (e) Falling film, (f) Forced circulation evaporator-crystallizer, (g) Three types of Oslo/Krystal circulating liquid evaporator-crystallizers. Figure 8.16. Some types of evaporators, (a) Horizontal tube, (b) Calandria type, (c) Thermocompressor evaporator, (d) Long tube vertical, (e) Falling film, (f) Forced circulation evaporator-crystallizer, (g) Three types of Oslo/Krystal circulating liquid evaporator-crystallizers.

See other pages where Evaporator falling-film type is mentioned: [Pg.474]    [Pg.477]    [Pg.426]    [Pg.474]    [Pg.477]    [Pg.234]    [Pg.426]    [Pg.451]    [Pg.426]    [Pg.426]    [Pg.510]    [Pg.383]    [Pg.126]    [Pg.474]    [Pg.91]    [Pg.336]    [Pg.226]    [Pg.574]    [Pg.268]    [Pg.474]    [Pg.475]    [Pg.478]    [Pg.1139]    [Pg.1140]    [Pg.107]    [Pg.695]    [Pg.813]    [Pg.816]    [Pg.208]    [Pg.87]    [Pg.474]    [Pg.475]    [Pg.478]    [Pg.107]    [Pg.1106]    [Pg.1666]   
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