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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Any such deposits will char in the hot inlet air stream, leading to scorched particles in the product, zpv can cause a fire or explosion. If large quantities of gas exit the dryer, an equally large quantity of heat is lost.

Dairy Processing Handbook

If any parts of the inside surface of the dryer are at a temperature below the dew point, there will be a localized condensation at those points. If the venturi throat cannot be adjusted for any reason, the correct air flow balance can be achieved by adjusting the pressure in the cooling duct by either changing the powder cooling exhaust fan speed or by making a small adjustment to the manual cold air butterfly valve.

If deposits are seen on the lower walls or cone, the vane angle may be too close to vertical. Air velocity through the cross section of the drying chamber is an important design factor and is determined, in part, by the final particle size required.

In addition, many thermo-sensitive materials can be dried successfully by this method. 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 handboook and fall to the bottom discharge point.

When the diffusion characteristics of the material or other process considerations call for extended residence times, these machines, no doubt, will continue to find application. This higher flow rate will require a larger orifice or you can expect an increase in nozzle pressure to get a finer powder particle. It is important to re-emphasize that, in almost all drying applications, the best energy saving technique is to pre-concentrate the product as far as possible prior to drying.


This is a direct result of the low evaporative rate, which normally is in the region of 0. If the hydraulic capacity of a centrifugal atomizer is exceeded for any reason, feed liquid is forced to flow up qpv atomizer spindle and through the bearings, causing very rapid failure in most cases. The capital cost of these alternatives is generally lower and maintenance is limited to such components as circulating fans and rotary valves.

The method of airflow employed on these dryers is either vertically downward through the material and the supporting band or alternatively upward. In addition to energy, there are also large savings on the capital cost of the dryer — which in most cases, far exceed the cost of the preliminary dewatering equipment. As the feed material is extruded off the end hanebook the screw into the drying chamber, it becomes coated in dried powder. Installation costs also are considerable.

When this occurs, the outlet temperature will rise, more feed is automatically introduced to try to reduce the temperature and the system will soon trip on high outlet temperature, leaving a very messy chamber to be cleaned.

Due to its ability to produce a uniform powder at relatively low temperatures, the spray dryer is probably the most common of these dryers.

This is accomplished by mounting an extra set of spray nozzles near the end of the drying section where the surfactant is applied. It has the higher hydraulic capacity due to its large acceleration chamber — and can withstand a certain amount of abuse during operation and cleaning. Where the feed is very mobile, rotating devices such as spray feeds are used. Generally, these extruders operate with rubber covered rollers moving over a perforated die plate with feed in the form of apc cakes, or more usually, as the discharge from a rotary vacuum filter.

Therefore, consideration must be given to the up-stream process, i. This simplifies environmental permitting issues, since any potential odor problems are eliminated.


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These fines are likely to be lost past the cyclones, leading to poor yields. The single fluid nozzle produces a narrow spray of fine particles.

With forced convection equipment, indirect heating frequently employs a condensing vapor such as steam in an extended surface tubular heat exchanger or in a steam jacket where conduction is the method of heat transfer.

Handbbook powder density produced by a nozzle atomizer is generally slightly higher than that produced on a centrifugal atomizer. An increased stuffing pump pressure ahead of the high pressure pump can help to reduce the effect of entrained air.

The small, dispersed particles dissolve in the water. This hot water will dissolve the deposits and take the majority of the material to the CIP water tank.

APV Dryer Handbook

In selecting the proper type of extruder, it is essential to carry out tests on semi-scale equipment, as no other valid assessment of suitability can be made. In such cases, the indirect-fired conduction type dryer is more suitable, since the dryer shell is usually enclosed in a brick fairy or outer steel jacket into which the hot gases are introduced.

To get a finer particle with a centrifugal atomizer, you need to run the wheel at a higher speed. When the degree of product attrition common to pneumatic and fluidized bed dryer operation is unacceptable, continuous band or hahdbook dryers can provide an effective solution. This would make selection of a fluid bed dryer completely unrealistic and probably would suggest a conventional rotary dryer for the application. Three basic methods of heat transfer are used in industrial dryers in various combinations.

This technique is most beneficial when product properties restrict the gas air inlet temperatures, requiring large volumes of gas air. This results in greatly increased evaporative rates as, may be seen from Table 1.