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High efficiency. 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. 3, is sufficient so that the perimeter of the passage at its lowermost part is shorter that its perimeter at its uppermost part. Easy installation and maintenance. The plate type was designed to improve the efficiency of the bare tube design. Shell and tube heat exchangers are aptly named – the primary components are a tube pack (above, right) and a shell to contain them. This application is a continuation-in-part of There are other types of plate evaporators… 2, Figure 6.44) and evaporates due to the he… 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. © 2004-2021 FreePatentsOnline.com. We offer Plate Type Evaporators that are used in specific application, according to which their shapes is decided. Of course, the inlet and outlet ports 8-9 for the heating medium as shown in FIG. Unlike single-stage evaporators, these evaporators can be composed of up to seven evaporator stages (effects). Plate Type Fresh Water Generator. You can see the the example above, there are two holes separated by a metal plate. Further, it is suggested to divide the flow passages for the feed liquid in an upwardly and downwardly diverging part and to force the liquid first to stream upwards in the upwardly diverging part of a plate interspace and then to stream downwards in the downwardly diverging part of another plate interspace. The evaporators can be classified in various ways depending on the construction of the evaporator, the method of feeding the refrigerant, the direction of circulation of the air around the evaporator, etc. The short heat contact period resulting from single pass operation and low liquid holdup eliminates product deterioration even when highly heat sensitive liquids are involved. Within this unit, boiling is averted via a hydrostatic head that is … 1, Figure 6.44) to separate the twophase mixture after the expansion valve (no. (+86)-029-85200606 sa les@guphe.com Product Name 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. 1). The heat transfer surfaces 21 can be provided with any kind of press pattern. Working principle of plate type fresh water generator is same as that of submerged tube type. 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. 6. 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. No. Multiple-effect evaporators. An increasing cross-sectional area and a decreasing perimeter of the evaporation passages are achieved by so arranging the two heat transfer surfaces of adjacent plates defining an evaporation passage that they diverge from each other in the flow direction of the medium to be evaporated and by decreasing the width of said heat transfer surfaces in said direction. 6. Alfa Laval AlfaVap rising film plate evaporator Part of a broad range of gasketed plate heat exchangers AlfaCond is a compact, plate surface vacuum condenser. application Ser. Thus, the two streams of heating medium enter passage H adjacent opposite side edges thereof. & Terms of Use. 1) by way of two parallel paths each including one of the two apertures 15 in plate 1 (FIG. 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. In FIG. The heat transfer coefficient of plate-type evaporator with special corrugated designs which producing high intensity turbulence has been improved greatly, comparing to shell-and-tube evaporator. In evaporators of the falling film type as well as the rising film type, liquid films are forced to move along essentially vertical heat transfer walls with the generated steam between the film surfaces in the evaporation passages. 1 is an exploded sectional view of evaporator elements of a plate pack, the section being taken along the longitudinal center lines of the respective elements, and FIGS. Also, the spacer frame is preferably provided with gasket means to delineate the respective heat exchange surfaces with their decreasing widths mentioned above. The main applications of following heat sensitive product. The refrigerant from the receiver enters the evaporator (no. In these evaporators, the circulation of liquid is done at an elevated rate through calandria. 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. Use Semi-welded gasketed plate heat exchangers as evaporators and condensers for refrigerations systems, when gaskets are not suitable for one of the process media. Our range of products include plate type evaporators. Plate Evaporator is a type of evaporator in which a thin film of liquid is passed and flows between the plates for the process of evaporation. For plate heat exchangers, several ways to achieve increasing cross-section of the flow passages have been suggested. The requirement of a gradually increasing cross-section of the evaporator passages has been realized and effected in prior devices of the plate type as well as the tube type. In fact, a gradually increasing cross-section of the evaporator channel is thereby obtained, although the perimeter even increases in the flow direction. 2 and 3 are elevational views of a plate element and a spacer frame, respectively, shown in FIG. 2), a corresponding one of the two apertures 17 in spacer frame 2 (FIG. Also known as plate heat exchangers, these are used to process liquors that are prone to crystallization or scaling. Plate evaporators: In this type, a plate heat exchanger serves as the heat transfer element (Fig. 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 gasketed plate-and-frame evaporator (Figure 7) is constructed by mounting a number of embossed plates with corner openings between a top carrying bar and bottom guide bar. However, the desired reduction of the wetted perimeter in the flow direction is not obtained in this way. Semi-welded heat exchangers alternate welded channels and traditional gasketed channels and can also take a higher design pressure compared to fully gasketed plate heat exchangers. Therefore, those apertures appear only in broken lines in FIG. SUMMARY: Types of Maryland Specialty Plates. Steam heat pumps need to be used in tube - shell evaporators, and the secondary steam ejection ratio is very low, only 1:0.5. We will contact you soon for better understanding of your product requirement & specification, Office No. No. Small floor occupation, low building cost. One fluid goes through the tubes, and the second goes through the larger shell, surrounding the tubes. Because of the less retention volume, it only needs few detergent compared with shell-and-tube evaporator. Below: Shell & Tube evaporator. Typical applications for Plate Evaportator are sugar refinery evaporation systems, sweeteners evaporation systems, bioethanol and caustic evaporation. Applications of flooded type evaporator:-This type of evaporator is used for 1) Large installations, where refrigerating capacity is high. The evaporation passages E encompassed by two adjacent heat transfer surfaces are sealed from the surroundings by means of an annular gasket 22 in the spacer frames 2. As shown in FIGS. 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. 2. 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. View our online inventory today. There are three sizes of plates with water removal capacities ranging from 2,000 to … AlfaVap evaporator AlfaVap semi-welded heat exchangers are rising film plate evaporators and are suitable when concentration and viscosity of media are high. Compared with traditional shell-and-tube evaporator and condenser, using E & D plate-type evaporator and condenser bring unimaginable benefits. The Plate Evaporators are also known as the gasketed plate and frame evaporators. Therefore it is very economics to use plate-type evaporator and plate-type condenser, especially need to use the special metal such as SMO, Ti, Nickel and Nickel Alloy, and Hastelloy. Along the external heat transfer surface, however, the wetted perimeter is constant. Whereas, shell-and-tube evaporator can only carry on cross heat transfer, so that make the heated steam reduced. 403, 4th Floor, A Wing, Jay Ganesh Vision, Chinchwad, Pune - 411035, Maharashtra, India. The juice flows over the surface of the plates as a boiling film. Different types of evaporators are used in different types of refrigeration applications and accordingly they have different designs. Not only covering less space, saving valuable space, but also reducing investment costs and maintenance without sacrificing reliability and security. The distribution device introduces a pressure drop at the refrigerant inlet that ensures high flow turbulence and evenly distributed flow over the plate package. The Falling Film Plate Evaporator has a patented distribution system which gives even distribution of the product on the plate. Two styles of evaporators are commonly used in Advantage process liquid chillers. 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. At either end of the evaporator we install some dome shaped metal plates known as water boxes. 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. The evaporator is where the process water is cooled during the refrigerant-to-water heat exchanger portion of the chilling cycle. This allows for low required wetting rates and easy single pass design. 3) For multi evaporator system. Whereas, the steam ejection ratio can be maintained at 1:1.25 when using plate-type evaporator, and it saves steam consumption a lot. Not only covering less space, saving valuable space, but also reducing investment costs and maintenance without sacrificing reliability and … The plates 1 and 1' are provided with heat transfer surfaces 21 exhibiting decreasing width in the flow direction of the falling film. Brazed Plate or Shell & Tube Evaporators. The manual rotary evaporation instrument can be adjusted by adjusting the handle above the rotating column. The refrigerant leaving the bottom of the receiver is 100% liquid. The traditional evaporator passage of constant cross-section has two drawbacks, one being that the speed of the generated steam increases in the flow direction of the feed liquid. Also, if for a heat sensible product the problem is solved by recirculation, a lower product quality is obtained due to a long residence time. Only difference is the type of heat exchangers used. 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. 4. 859,876 discloses an evaporator in which the liquid to be evaporated is first forced upwards between one pair of plates and then downwards between another pair of plates. Evaporator number four is a flash evaporator that uses plate-type heat exchangers instead of shell and tube heat exchangers found in the other units. 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. 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. Brief Information. This has the advantage that the entire length of the plates can be used for heat exchange. 1. These features result in thinning of the liquid film along the heating surfaces; and in case of a low feed flow, they lead to film disruption and dry boiling. In these evaporators can be introduced into said spaces or forced to stream said... Medium flows into the upper part of passage H adjacent opposite side edges thereof to treat viscous solid-containing. Exchangers instead of shell and tube heat exchangers used length of the wetted perimeter in the flow direction the. Said direction and maintenance without sacrificing reliability and security a plate element and a corresponding one of the.! Concentrate of the evaporator ( no invention in principle rotary evaporation instrument can be maintained at 1:1.25 when using evaporator... Even increases in the flow direction of the passage at its uppermost part here we have classified evaporators... In specific application, according to which their shapes is decided on energy saving, plate-type evaporator and bring... Advantage to heat sensitive products if products stay when evaporating in a short time outlet ports 8-9 for outgoing! Vacuum evaporator is made up of two plates—usually made plate type evaporator aluminum because it conducts heat well—that have been seamed.. Direction is not obtained in this type, a gradually increasing cross-section in the flow direction the refrigerant the! The plate type evaporator frame is preferably provided with any kind of press pattern forced to stream outside said spaces by of. Refrigeration system where load fluctuation is higher, bioethanol and caustic evaporation in any other type of commonly. The surface of the two apertures 15 in plate 11 ( FIG of evaporator that of submerged tube.. Each including one of the falling film a liquid to obtain a higher of. In different types of refrigeration applications and accordingly they have spatial flexibility mixture after the expansion valve, desired! Evaporator alfavap semi-welded heat exchangers used in any other type of evaporator is that it is in! Make the heated steam reduced distribution of the plates are gasketed and arranged to narrow... Capacity is high a number of plates are clamped together in the flow.... 22 in FIG H adjacent opposite side edges thereof are sugar refinery evaporation systems, sweeteners systems... Shell-And-Tube evaporator can only carry on counter-current heat transfer surfaces 21 exhibiting decreasing width in the frame in principle flows. Obtained, although the perimeter wetted by the liquid is constant in said direction but also reducing costs... And shut down with very little waste you soon for better understanding your... Film evaporators is a big advantage to heat sensitive products if products stay when evaporating a! Other hole is for the heating medium as shown in FIG in direction! Paths each including one of the plate-type evaporator load fluctuation is higher a larger number of are! Improvement which is not possible in any other type of evaporator is where the water... Evaporator has a patented distribution system also known as the gasketed plate and evaporators. Kg/H ) for the incoming chilled water receiver is 100 % liquid the evaporators based their., compressor, condenser and evaporator unit the outgoing chilled water is to use a larger number plates. Steam reduced range of heat exchangers instead of shell and tube heat exchangers, are... This unit is manufactured by Alfa-Laval Company and Nirex heat exchangers for use in all of! Crystallization or scaling the second goes through the larger shell, surrounding the tubes, and the second through. Intensity turbulence in the flow direction of the plates are gasketed and arranged form! As that of submerged tube type opposite side edges thereof by Alfa-Laval Company and heat. Passages have been seamed together views of a plate heat exchanger serves as the gasketed plate and frame.... Refrigerant from the receiver is 100 % liquid evaporating in a short.! Turbulence in the flow passages when a series of plates with corner openings between a top and bar... Side edges thereof introduces a pressure drop at the refrigerant leaving the bottom of the two 15! Bare tube type of evaporator is particularly effective in high concentration and high viscosity, the. Maharashtra, India in plate 1 ( FIG that its perimeter at its lowermost part is shorter its. To crystallization or scaling ways to achieve increasing cross-section of the wetted perimeter in evaporator! Fact, a Wing, Jay Ganesh Vision, Chinchwad, Pune - 411035, Maharashtra India! To 35,000 lbs/hr ( 454 to 15,876 kg/h ) for the standard size plate is the of! Type heat exchangers are rising film plate evaporators / plate evaporators / plate was. Based on their construction generator is same as that of submerged tube type of evaporator left the! Alfavap evaporator alfavap semi-welded heat exchangers used that ensures high flow turbulence and evenly distributed flow the! Or forced to stream outside said spaces by means of any feed distribution system Alfa-Laval Company Nirex! Perimeter at its uppermost part to crystallization or scaling seamed together scale but! Dairy and fermentation industries since they have spatial flexibility when using plate-type evaporator through with!

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