In an evaporator handling an aqueous salt solution, the overall coefficient U (kW/ m2 deg K) is .. these. Figure shows the flow and plate arrangement of an APV falling-film plate .. MINTON, P. E.: Handbook of Evaporation Technology. This Handbook describes the many types of evaporators and operating options manufacturing capabilities of companies within the APV Group. oncentration. This handbook describes the paraflow and its operating principle, The paraflow is the original plate type heat exchanger designed by APV to provide.

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Even during a complete interruption of powder flow, the fluidized material will remain in the re-wet section as a stabilizing factor in the process.

Circulation evaporators are fairly compact and are easy to clean and operate. There are two types of Circulation Evaporation; Natural Circulation Evaporators and Forced Circulation Evaporators, both of which are still currently used in industry today, although forced Circulation systems, which have a circulation pump as opposed to natural systems with no driving force, have a much wider range of appropriate uses.

Climbing and Falling Film Plate Evaporator

Typically pigment powders, fillers, talcum powder Free Flowing: If the bottom of the whirl trap feels cool, the cyclone pressure is lower than the powder cooling duct evaporatot and cold air is entering the cyclone from the venturi. In similar circumstances, another special type of multi-deck dryer can be used which employs a system of tilting trays so that the product is supported on both the normal working and the inside of the return run of the conveyor band.

As a rule of thumb, the limiting viscosity for good atomization is — Centipoise. In the case of a cyclone, the pressure drop is used to swirl the powder and air around the inside surface, causing the powder to be thrown to the outside and fall to the bottom discharge point.


Condensate out at F 3. This is a very flexible and reliable system that can run both food products and heat-sensitive non-food products requiring stainless steel contact surfaces.

APV Dryer Handbook

Alternatively, and where the material is thermosensitive, implying low temperatures with consequently low evaporative rates, some improvement can be effected by the use of sub-atmospheric dryers, i. To correct the seal, the metal face must be bent towards the silicone seal.

Reliability is extremely high, maintenance is very low, and operator attention is usually limited to periodically changing the powder container. It requires about a 15 ft. Wide ranges of process stages include: Has stainless steel product contact. In order to improve the productivity of the plant, the energy consumption needs to be reduced with the intention of reducing the use of steam. Plate heat exchanger model: Similarly, large rotary vacuum dryers are used for pigment pastes and other such materials, especially where organic solvents present in the feedstock need to be recovered.

Estimated water removal rate: If the dryer is then completely clean, increase the inlet temperature by a few degrees and try again. However, the cost per pound of dry product is significantly lower when drying from the higher feed solids.

All the powder leaves the chamber and is collected in the cyclone. When mechanical separation is not possible, evaporation should be considered.

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This combination of pressure waves and heat is used for drying free-flowing, high moisture and low solids liquid feed streams. It should be appreciated, however, that drying rates considerably vary in view of the variety of materials and widely differing chemical and physical characteristics. A good degree of temperature control can be achieved in fluid bed dryers and the residence time of the material can be varied either by the adjustment of the discharge weir or by the use of multi-stage units.


The principle disadvantage in spray drying is that there is very little adjustment of possible flow rate without changing the powder properties or shutting down to change the nozzle set-up. In fluid bed dryers, special attention must be paid to the nature of the proposed feed since one condition can militate against another.



In addition, multiple effect columns can be incorporated to give an extended path length or continuous recirculatory systems employing both air and product recycle can be used as illustrated in Figure Plate Forced Circulation Evaporators utilize a wpv pump which forces liquid to circulate through the plate structures and heat exchanger.

This can result in reduced quality due to changes in color, taste or other functional properties. Simplex nozzle for spray drying dryer to produce powder. handgook

Another case is when the minimum fluidizing velocity is so low that a dryer of very large surface dimensions is necessary to obtain the required thermal input. The intention is to set the powder hanxbook exhaust fan speed and the manual valve so that the air flow is minimized — and the pressure in the powder cooling duct at the venturi throat is slightly lower than the pressure in the cyclone.

It is a painted carbon steel frame with SS plates and product contact surfaces. Also features a Fundafom model foam separator.

S-line fitting, 1 12 in.