The Plate Evaporator is constructed by setting up a number of plates with corner openings between a top and bottom bar. It is an extension of the falling film evaporator, and has application in any field where the liquid to be evaporated cannot withstand extended exposure to high temperatures, such as the concentration of fruit juices. 1 is taken. 1). 2, Figure 6.44) and evaporates due to the he… 4. British Patent No. Also known as plate heat exchangers, these are used to process liquors that are prone to crystallization or scaling. No. 2. One suggestion to achieve increased channel cross-section in this evaporator is to locate the last mentioned pair of plates at a larger distance from each other than the distance between the first mentioned pair of plates. We will contact you soon for better understanding of your product requirement & specification, Office No. Here we have classified the evaporators based on their construction. The very low retention means that at any given time, there is almost no product left in the evaporator of the plate-type evaporator. The present invention relates to an evaporator of the plate heat exchanger type comprising several heat exchanger plates essentially vertically arranged in spaced face-to-face relationship to define flow spaces between the plates for liquid to be evaporated and for heating medium. There are other types of plate evaporators… As shown in FIGS. The product flow fed to the evaporator flows in the different evaporator passages E through apertures 10 and 10' in the plates 1 and 1' and passages 11 in the spacer frames 3, which passages are sealed from the heating medium passages H by means of gaskets 11a. The mutual divergence between the two heat exchange surfaces in such a case can be achieved by pressing out the two plate surfaces more and more towards each other in the direction towards the inlet end of the plates. As the original plate type evaporator, the Rising/Falling Film Plate system is a flexible, multi-duty unit engineered to handle small to medium production runs of heat sensitive products. 219,561 discloses a special evaporator in which the two desired features of decreasing wetted perimeter and increasing cross-section of the evaporation passages are met in the form of channels between two conical plate elements with different cone angles. 2 and 3, apertures 15, 17, 18 and 20 are located adjacent the longitudinal side edges of elements 1 and 2 so that they are displaced from the longitudinal center lines on which the section in FIG. Privacy Policy The plate type was designed to improve the efficiency of the bare tube design. 328,662 filed 12/8/81, abandoned. 5). The prototypical shell and tube heat exchanger has only one inner tube, and is typically used to teach engineering students the basic concept of a heat exchanger. The invention will now be further described in connection with an embodiment of a plate evaporator of the falling film type and with reference to the accompanying drawing, in which FIG. This has the advantage that the entire length of the plates can be used for heat exchange. The plate type evaporator is made up of two plates—usually made of aluminum because it conducts heat well—that have been seamed together. In practice, this problem is often solved by overloading on the product side, which means maintaining an unnecessarily thick film along a larger part of the heating surfaces giving low heat transfer values and requiring long heating surfaces. The refrigerant from the receiver enters the evaporator (no. application Ser. 1, the path of the product to be evaporated and the evaporated product with generated steam is shown in full lines with arrows indicating the flow direction; and the path of the heating medium is shown in broken lines with arrows indicating the flow direction. Further, it is not necessary to feed or discharge all the flows through ports located inside the periphery of the plates. 788,193 shows heat exchanger plates provided with horizontally extended corrugations and increasing evaporation channel cross-section in the flow direction is achieved by successively changing the angle of said corrugations in said direction. 2 and 3 are elevational views of a plate element and a spacer frame, respectively, shown in FIG. Within this unit, boiling is averted via a hydrostatic head that is … Plate evaporator can also be designed for once through operation with suitable design improvement which is not possible in any other type of evaporator. It will be understood that the parts 1, 1' and 2-5 are clamped together by conventional means (not shown) to form the plate pack. Below: Shell & Tube evaporator. For example, the plate pack can be surrounded by a cover for product steam, and the plates can be designed to allow free product discharge at the lower end of the plate pack. The function of the spacer frames may, of course, be included as an integrated part of the plate themselves, in which gasket grooves are pressed in a well known manner. As illustrated, the evaporator comprises a plate pack having a series of heat exchange plates 1 and 1' arranged between alternating spacer frames 2 and 3, thereby forming evaporation passages E alternating with passages H for a heating medium. Multiple-effect evaporators. Many specialty license plates are available to Maryland vehicle owners, from personalized car tags to plates affiliated with organizations.If you're eligible, you can also get a military plate or classic car tag. Less scale and convenient maintenance. Also, the spacer frame is preferably provided with gasket means to delineate the respective heat exchange surfaces with their decreasing widths mentioned above. Applications of flooded type evaporator:-This type of evaporator is used for 1) Large installations, where refrigerating capacity is high. SWEP evaporators facilitate stable and efficient operation down to very low refrigerant flow rates and low superheat, due to our patented distribution systems. A plate evaporator comprises several heat exchange plates arranged substantially vertically in spaced face-to-face relationship to define between the plates evaporation passages alternating with heating medium passages. The finned evaporators are the bare tube type of evaporators covered with the fins. The reason for this is that although the passage's cross-sectional area increases in the flow direction due to the downwardly diverging plates 1 and 11 (FIG. © 2004-2021 FreePatentsOnline.com. Plate Evaporator is associated type of Semi-Welded Plate Heat Exchanger, rising film plate evaporators and are suitable when concentration and viscosity of fluid are high. The flexible design of the plate-type evaporator means it is easier to inspect the surface of the thermal conduction, and it can be cleaned by mechanical method which is only removing the fasten bolts and loosening the pressing plate. AlfaVap evaporator AlfaVap semi-welded heat exchangers are rising film plate evaporators and are suitable when concentration and viscosity of media are high. The unique design of plate-type evaporator and plate-type condenser have higher thermal efficiency compared to traditional shell-and-tube facilities, it means the required heat exchange area is greatly reduced. evaporator, compressor, condenser and expansion valve, the flooded system needs a receiver (no. It also allows for quick start and shut down with very little waste. Advantages of plate type evaporators: 1. Therefore, those apertures appear only in broken lines in FIG. British Patent No. SUMMARY: Types of Maryland Specialty Plates. 165/166, 165/167, DAVIS HOXIE FAITHFULL & HAPGOOD (ARLINGTON, VA, US), Click for automatic bibliography In fact, a gradually increasing cross-section of the evaporator channel is thereby obtained, although the perimeter even increases in the flow direction. ✓Thank youThanks for sharing your contact infoWe will get back shortly. This allows for low required wetting rates and easy single pass design. Similarly, two streams of the heating medium discharge from the lower part of passage H, adjacent opposite side edges thereof, into respective flow paths each including one of the two apertures 181 in plate 11, a corresponding one of the two apertures 20 in spacer frame 2 and a corresponding one of the two apertures 18 in plate 1. Evaporation with falling film evaporators is a very efficient way of removing water from a liquid to obtain a higher concentrate of the solids. Small floor occupation, low building cost. 3) For multi evaporator system. Because the least temperature difference of first effect evaporation of shell-and-tube evaporator need to be maintained at 15¿¿¿, it means the temperature of the steam into the shell-and-tube evaporator need to be at higher level, and can only pump small amount of low temperature of secondary steam. 3, is sufficient so that the perimeter of the passage at its lowermost part is shorter that its perimeter at its uppermost part. Not only covering less space, saving valuable space, but also reducing investment costs and maintenance without sacrificing reliability and security. & Terms of Use. 2,117,337, which relates to a tube evaporator, a circular evaporator channel is provided with an internal conical body for heating steam, whereby expanding evaporator channels and also decreasing wetted perimeter with respect to the internal heat transfer surface are obtained. Of course, the inlet and outlet ports 8-9 for the heating medium as shown in FIG. The principal object of the present invention is to provide an evaporator of the plate type having the two desired features mentioned above and which meets the above-mentioned requirements of a simple channel design and safe operation.

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