Compact Evaporator Manufacturer Exporter Supplier India UAE Dubai Iran Bangladesh Nepal USA

Ylem Parto designs, manufactures multi-purpose compact evaporators have numerous advantages that make them excellent choices for dairy, beverage, specialty food, and industrial fluid applications.

• Ideal for heat-sensitive products, up to 9,000kg/h water removal and boiling temperatures as low as 45°C.

• Flexible, simple-to-operate process with full automation allows handling of a variety of products.

• Low maintenance costs, with stainless steel components and minimum moving parts.

• Tubular design with few gaskets minimizes the possibility of vacuum leaks.

• Approved in compliance with dairy processing requirements.F

• Fully skid-mounted, pre-assembled unit allows easy site installation without extensive foundation work.




The compact evaporator operates by the simple falling film principle, in which fluid is pumped into the top of each calandria through a liquid distributor and flows down the inside of each tube as a thin liquid film. Hot vapors condense on the outside tube walls, releasing heat that is transferred to the fluid. Vigorous boiling takes place as the fluid is falling vertically at turbulent conditions. Concentrate plus product vapors exit the tube bottoms, to be separated in the calandria bottom and integral separator. Fluid may be concentrated in one or more effects in series, flowing parallel to or counterflow with the vapor flow. All condensed vapors are removed from the calandria shells as liquid condensate. Waste heat is absorbed in a surface condenser.

Heating of the evaporator is typically by live steam or by thermal vapor recompression (TVR), with some vapors recycled for improved efficiency.

This evaporator design is functionally identical to the time-tested and broadly accepted long-tube falling film evaporators that are so extensively used for food, pharmaceutical, and many industrial applications.

Our other Evaporators are:
Vacuum Pan Evaporator
Milk Evaporator
Molecular Still
Molecular Sieve
Agitated Thin Film Evaporator
Vertical Short/Long Tube Evaporator (Calendria type)
Horizontal Tube Evaporators
Basket Type Evaporators



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Forced Circulation Evaporator Manufacturer India Bangladesh Nepal Iran Dubai Nigeria Kenya

Ylem Parto design, manufacture forced circulation evaporator. Forced circulation evaporators are used if boiling of the product on the heating surfaces is to be avoided due to the fouling characteristics of the product, or to avoid crystallization. The flow velocity in the tubes must be high, and high-capacity pumps are required.

The circulating product is heated when it flows through the heat exchanger and then partially evaporated when the pressure is reduced in the flash vessel (separator). The liquid product is typically heated only a few degrees for each pass through the heat exchanger. To maintain a good heat transfer within the heat exchanger it is necessary to have a high recirculation flow rate.

This type of evaporator is also used in crystallizing applications because no evaporation, and therefore no concentration increase, takes place on the heat transfer surface. Evaporation occurs as the liquid is flash evaporated in the flash vessel/separator. In crystallizer applications this is then where the crystals form, and special separator designs are used to separate crystals from the recirculated crystal slurry. More information about crystallization is available in the crystallization section.

The heat exchanger (in evaporator parlance sometimes called the "calandria") can be arranged either horizontally or vertically depending on the specific requirements in each case.
 

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Falling Film Evaporator Manufacturer Exporter Supplier India Bangladesh Nigeria Kenya Dubai UAE Saudi Arabia(SA)

Ylem Parto design, manufacture falling film evaporator. In falling film evaporators the liquid product usually enters the evaporator at the head of the evaporator. In the head the product is evenly distributed into the heating tubes. A thin film enters the heating tube are it flows downwards at boiling temperature and is partially evaporated. In most cases steam is used for heating the evaporator. The product and the vapor both flow downwards in a parallel flow. This gravity-induced downward movement is increasingly augmented by the co-current vapor flow. The separation of the concentrated product form its vapor is undergoing in the lower part of the heat exchanger and the separator .

Falling film evaporators can be operated with very low temperature differences between the heating media and the boiling liquid, and they also have very short product contact times, typically just a few seconds per pass. These characteristics make the falling film evaporator particularly suitable for heat-sensitive products, and it is today the most frequently used type of evaporator.



However, falling film evaporators must be designed very carefully for each operating condition; sufficient wetting (product film thickness) of the heating surface by liquid is extremely important for trouble-free operation of the plant. If the heating surfaces are not wetted sufficiently, dry patches and incrustations will occur; at worst, the heating tubes will be completely clogged. In critical cases the wetting rate can be increased by extending or dividing the evaporator effects, keeping the advantages of single pass (no recirculation of product) operation.
The proper design of the product distribution system in the head of the evaporator is critical to achieve full and even product wetting of the tubes.

Because of the low liquid holding volume in this type of unit, the falling film evaporator can be started up quickly and changed to cleaning mode or another product easily.

Falling film evaporators are highly responsive to alterations of parameters such as energy supply, vacuum, feed rate, concentrations, etc. When equipped with a well designed automatic control system they can produce a very consistent concentrated product.

The fact that falling film evaporators can be operated with small temperature differences makes it possible to use them in multiple effect configurations or with mechanical vapor compression systems in modern plants with very low energy consumption.




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Rising Film Evaporator Manufacturer Exporter Supplier India Bangladesh Nepal Iran Dubai Saudi Arabia(SA)

Ylem Parto design, manufacture rising film evaporator. These operate on a "thermo-siphon" principle. Feed product enters the bottom of the heating tubes and as it heats, steam begins to form. The ascending force of this steam produced during the boiling causes liquid and vapors to flow upwards in parallel flow. At the same time the production of vapor increases and the product is pressed as a thin film on the walls of the tubes, and the liquid rises upwards. This co-current upward movement against gravity has the beneficial effect of creating a high degree of turbulence in the liquid. This is advantageous during evaporation of highly viscous products and products that have a tendency to foul the heating surfaces.

Usually there must be a rather high temperature difference between the heating and boiling sides of this type of evaporator. Otherwise the energy of the vapor flow is not sufficient to convey the liquid and to produce the rising film.

The length of the boiling tubes will typically not exceed 6m.
Evaporation rate @ 22,690 Kg/h.

This type of evaporator is often used with product recirculation, where some of the formed concentrate is reintroduced back to the feed inlet in order to produce sufficient liquid loading inside the heating tubes.

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Wiped Film Evaporator Manufacturer Supplier Exporter India Kenya Nigeria Iran Dubai UAE Bangladesh

Ylem Parto design, manufactures Wiped Film Evaporator is used for concentration, distilling, stripping, dehydration and deodorisation of products which are heat sensitive or viscous. The equipment can handle a very wide range of feed compositions ranging from 1% to over 95% concentration. The operation is continuous with a single pass; the self cleaning continuous contact wipers produce and renew the thin film. Such an operation improves product yield, avoids residue and colour formation. It has an internal condenser (optional) that minimizes the pressure drop and maintains vacuum.


Operation process in the WFE is simple but yet effective. Feed is introduced at the top of the unit and spread on the shell inner surface by the rotating distribution plate. Specially designed wipers wipe the feed thus creating and renewing the film. This thin film enables an efficient heat transfer even for highly viscous fluids. The low boiling component evaporates and passes through an entrainment separator. This minimizes the carry over of liquid droplets along with the vapors. The vapors are removed through the vapor line to an external condenser (optional) and condensed. For specific applications which demand low pressure drop, the central section of the evaporator is provided with a condenser, thus making the unit a short path/molecular distillation unit. In this case, the vapors are allowed to condense on the outside of the tube bundle and flow out of the vaporator via the condensate outlet provided at the centre.




The high boiling component flows along the shell wall and is discharged from the product outlet. Wiper action is important in promoting downward flow. The product/concentrate should be in fluid form at the operating temperature. Different designs of rotors are available depending upon the product, its viscosity and the process pressure.

Advantages
• Evaporation at low operating temperature
• Short residence time (few seconds)
• High heat transfer coefficients
• Low pressure drop on vapor side
• No degradation or loss of active ingredients
• Self cleaning\wiping of the heat transfer surface
• Suitable for viscous liquids
• Continuous operation
• Low maintenance





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Waste Heat Recovery Evaporator Manufacturer Exporter Supplier India Bangladesh Nepal USA Iran Dubai

Ylem Parto offers WHE operates along the same basic principles, but uses the steam dryers to generate the heat needed for the first stage of concentration. This heat would otherwise be released to the atmosphere, so the Waste Heat Evaporator has the advantage of both reducing energy costs and of reducing heat pollution.The concentration of liquors from the press is carried out without steam consumption, except for the quantity necessary to create a vacuum.

It uses waste energy from the drier as the heating energy

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