Download manuals for APV pumps, heat exchangers and homogenizers here. As one of the most energy intensive processes used in the dairy, food and chemical .. The reader is referred to the APV Corrosion Handbook, as well as the. pigments to proteins, as well as minerals to dairy products. Because of the spectrum of duties required, there is a great variety of dryers available. The.

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APV Dryer Handbook

Alternatively, and where there is limited floor space or a possible need for long residence time, multi-pass units are used with the conveyors mounted one above the other. Furthermore, in addition to the methods listed above, oil- or gas-fired indirect heat exchangers can also be used. The first stage of drying would remove the bulk of the water, but since the product would not need to be low in dryness, the outlet air temperature could be lower. This may — or may NOT — be a good thing.

There is a wide variety daiyr spray dryer configurations, each suited to a particular type of powder or feed consistency.

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. Diluting the feed means less powder for handbookk pound of water, or put another way, less powder will be produced from the dryer, even though it is running at the same operating temperatures.

Spin flash dryer in closed cycle hzndbook Capacity can be adjusted to suit the output from the preceding process equipment which may be hard to control and slow in its response time. Atomization can be with nozzles or by a centrifugal atomizer.

The use of fan systems minimizes both power requirements and operating costs.

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. Thermal energy required for drying vs. Alternative configurations of spray dryers showing A tall form type and B conical As an alternative, the two-fluid nozzle with external mixing is used for a variety of abrasive materials.


This mass, added to the powder produced and bagged, hadbook be very close to the total solids used in the feed formulation. Since the heat exchanger is positioned within the insulated shell in this type of dryer, apc air rejection rate is extremely low and thermal efficiencies are high.

A proper detailed design is uandbook for trouble-free operation. The most usual type of heating is by steam, although hot water or one of the proprietary heat transfer fluids can be used.

The object is to give longer residence times where this is necessary. This technique is most beneficial when product properties restrict the gas air inlet temperatures, requiring large volumes of gas air. Dried powder is discharged continuously from the bottom hanbook the bag collector through the discharge valve A higher wheel speed causes a greater pumping action within the atomizer wheel and contributes to the hydraulic capacity of the atomizer.

The powder is fed into the agglomerator by a volumetric screw feeder. Many different spray dryer configurations, along with a variety of air flow patterns, are in current use. This arrangement considerably increases the residence time within the dryer and is particularly useful where the product has poor diffusion characteristics.

As the pressure wave falls after the first cycle, it is followed by a negative pressure wave, which draws in more air and fuel. Powder production generally involves some form of drying operation. Typical single pass dryers of modular construction are illustrated in Figures 11 and The drying air enters the air heater 4is typically heated by a direct fired gas burner 5 and enters the handbooi air inlet plenum 6 tangentially. It may also be necessary to adjust the main dairu to trim the cyclone pressure drop, understanding that this dajry reduce the instantaneous production rate.

The final drying can then daiyr performed by a spin flash or pneumatic dryer. Protein, pigments, iron oxide, crystals Inert: The rate of drying can affect the density, since the surface of the particle can either retain its initial shape case hardening or shrink as the internal water evaporates.


APV Dryer Handbook

Easiest mixing and dissolving — infant formula, creamer Coated: Good, dry, insulation and careful design of the chamber habdbook, combined with an adequate warm-up time, will generally eliminate condensation deposits. It is important, therefore, when using the figures quoted that an attempt is made to carefully assess the nature of the product to be handled and the conditions to which it may be subjected to achieve greater accuracy. This makes these units ideal for use in the pharmaceutical field.

Feed material Dilatent fluids The dryer and lighter particles Cohesive paste become airborne in the drying Filter cake air stream and rise up the Moist granules walls of the drying chamber, Product residence time seconds passing the end of the feed screw and providing, in effect, a continuous back mixing daory within the heart of the dryer. The characteristics of the formed agglomerate can be influenced by operating conditions such as binder liquid rate, fluidizing velocity and temperature.

As a general rule, use a handvook swirl chamber to wpv a wider spray or a thicker swirl chamber for a narrower angle or longer spray. This is seen, for example, in flavor compounds when a pure solution of maltodextrine or Gum Arabic may further encapsulate the volatile flavor essences and create better shelf life. This situation, however, can be improved by preforming gandbook product to increase the effective surface area presented to heat and mass transfer.

An example of this is the tower configuration designed to accommodate the inverted jet of the two-fluid nozzle, whereas the dary and cone of the more usual configuration is designed for the spray pattern produced by a disc type atomizer, shown in Figure 7.

Heating — for thermoplastic materials. The principle sources of thermal energy are oil, gas and coal. Reliability is extremely high, maintenance is very low, and operator attention is usually limited to periodically changing the powder container.