It is one of the most popular feature of plate-type evaporator that you can just add or remove the plate group based on the current frame if you want to expand or reduce the capacity, and it is the major advantage compared to shell-and-tube evaporator which has the fixed capacity when installing. 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. Further, it is not necessary to feed or discharge all the flows through ports located inside the periphery of the plates. 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. Because of the less retention volume, it only needs few detergent compared with shell-and-tube evaporator. Industrial line is an extremely versatile range of heat exchangers for use in all types of industries. In U.S. Pat. The other is that the perimeter wetted by the liquid is constant in said direction. 6. 9.12). 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. View our online inventory today. 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. 1. 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. The plates 1 and 1' are provided with heat transfer surfaces 21 exhibiting decreasing width in the flow direction of the falling film. 1 is taken. In addition to the basic equipment in a direct expansion refrigeration circuit, i.e. Our range of products include plate type evaporators. However, the desired reduction of the wetted perimeter in the flow direction is not obtained in this way. In fact, a gradually increasing cross-section of the evaporator channel is thereby obtained, although the perimeter even increases in the flow direction. 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. © 2004-2021 FreePatentsOnline.com. Typical applications for Plate Evaportator are sugar refinery evaporation systems, sweeteners evaporation systems, bioethanol and caustic evaporation. Small floor occupation, low building cost. One fluid goes through the tubes, and the second goes through the larger shell, surrounding the tubes. For plate heat exchangers, several ways to achieve increasing cross-section of the flow passages have been suggested. 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. 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. Plate Evaporator , Find Complete Details about Plate Evaporator,Plate Evaporator,Plate Type Evaporator,Plate Ice Maker Evaporator from Refrigeration & Heat Exchange Parts Supplier or Manufacturer-Jiangmen City East-Alliance Thermal Equipment Co., Ltd. Thus, the two streams of heating medium enter passage H adjacent opposite side edges thereof. 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 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. 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. 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. 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 very low retention means that at any given time, there is almost no product left in the evaporator of the plate-type evaporator. It can be seen clearly from the below schematic diagram, it is a triple effect evaporation system device, and the plate-type evaporator and plate-type condenser can save installation charge and save space greatly compared with traditional devices. 165/166, 165/167, DAVIS HOXIE FAITHFULL & HAPGOOD (ARLINGTON, VA, US), Click for automatic bibliography Privacy Policy 3) For multi evaporator system. Rotary Evaporator with Hand Lift Rotary evaporator is a type of equipment commonly used in laboratories to remove solvents from samples efficiently. Machinery and Equipment buys and sells all types of Used Heat Exchangers including shell and tube, plate type, sprial, tube-in-tube, block type and more. British Patent No. 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. Along the external heat transfer surface, however, the wetted perimeter is constant. The refrigerant from the receiver enters the evaporator (no. As shown in FIGS. 5. 328,662 filed 12/8/81, abandoned. Evaporation with falling film evaporators is a very efficient way of removing water from a liquid to obtain a higher concentrate of the solids. Brazed Plate or Shell & Tube Evaporators. Easy installation and maintenance. 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. A climbing/falling film plate evaporator is a specialized type of evaporator in which a thin film of liquid is passed over a rising and falling plate to allow the evaporation process to occur. 2 and 3 are elevational views of a plate element and a spacer frame, respectively, shown in FIG. In other words, the outer boundary of passage E, as viewed in the flow direction, decreases progressively in length as the flow proceeds through it. The distribution device introduces a pressure drop at the refrigerant inlet that ensures high flow turbulence and evenly distributed flow over the plate package. Above: Brazed plate evaporator. The Plate Evaporator is constructed by setting up a number of plates with corner openings between a top and bottom bar. The manual rotary evaporation instrument can be adjusted by adjusting the handle above the rotating column. ✓Thank youThanks for sharing your contact infoWe will get back shortly. 3, is sufficient so that the perimeter of the passage at its lowermost part is shorter that its perimeter at its uppermost part. A negative point of this type of evaporator is that it is limited in its ability to treat viscous or solid-containing products. & Terms of Use. 1), the decrease in the passage's width, as shown at 22 in FIG. Finned evaporator. The plate type was designed to improve the efficiency of the bare tube design. Not only covering less space, saving valuable space, but also reducing investment costs and maintenance without sacrificing reliability and security. 5). 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. Brief Information. No. Low investment. The pack also has end wall elements 4 and 5, the end wall 4 being provided with an inlet 6 in its upper part for the product to be evaporated, an outlet 7 in its lower part for the evaporated product and generated steam, and an inlet 8 and outlet 9 for the heating medium. A plate evaporator made according to the invention is characterized mainly in that the two plates of each adjacent pair defining an evaporation passage have respective heat exchange surfaces which diverge from each other in the direction of flow through such passage, so that the passage has a cross-sectional area which increases in the flow direction, and the width of each of the two heat exchange surfaces decreases in the flow direction to provide the evaporation passage with a perimeter at a given cross-section through the evaporation passage which decreases in said direction. The refrigerant leaving the bottom of the receiver is 100% liquid. Another suggestion is to use a larger number of plate interspaces for the downward flow than for the upward flow. Advantages of plate type evaporators: 1. 2. Further, to facilitate cleaning of the evaporation surfaces and to avoid operational disturbences due to clogging of the evaporation channels, a simple channel design is required. 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. generation, Process of and apparatus for transferring heat, <- Previous Patent (Auxiliary power syst...). It also allows for quick start and shut down with very little waste. Save space and Save installation budget. The plate type evaporator is made up of two plates—usually made of aluminum because it conducts heat well—that have been seamed together. Therefore, those apertures appear only in broken lines in FIG. All rights reserved. Heating medium fed through the inlet port 8 flows through apertures 15 and 15' in the plates 1 and 1' and the corresponding passages 17 provided with gaskets 16 in the spacer frames 2 into the heating medium passages H and then flows towards the outlet 9 through apertures 18 and 18' in the plates 1 and 1' and the corresponding passages 20 provided with the gaskets 19 in the spacer frames 2. 3. Within this unit, boiling is averted via a hydrostatic head that is … Working principle of plate type fresh water generator is same as that of submerged tube type. 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 plates are gasketed and arranged to form narrow flow passages when a series of plates are clamped together in the frame. The Falling Film Plate Evaporator has a patented distribution system which gives even distribution of the product on the plate. Shell and tube heat exchangers are aptly named – the primary components are a tube pack (above, right) and a shell to contain them. SUMMARY: Types of Maryland Specialty Plates. 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. Less scale and convenient maintenance. The invention also includes such plate evaporators in which a pair of heat exchange plates are joined together by any sealing arrangement, such as welding, around the periphery of the plates to form closed spaces for product or heating medium. There are three sizes of plates with water removal capacities ranging from 2,000 to … 2, Figure 6.44) and evaporates due to the he… Privacy Policy 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. Compared with traditional shell-and-tube evaporator and condenser, using E & D plate-type evaporator and condenser bring unimaginable benefits. High efficiency. 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. 2) In a refrigeration system where load fluctuation is higher. The above-described embodiment is selected to exemplify the invention in principle. Plate evaporator can also be designed for once through operation with suitable design improvement which is not possible in any other type of evaporator. With high efficiency (the total transfer coefficient is 2-4 times of the tube evaporator), compact structure, convenient disassembly and cleaning, low liquid holding capacity, short time of … 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. To be a realistic alternative from the economical point of view, an evaporator in which the two above-mentioned desired features are combined must not be too complicated to manufacture. Of course, the inlet and outlet ports 8-9 for the heating medium as shown in FIG. The original plate type evaporator, the Rising/Falling Plate system is a flexible, multi- duty unit engineered to handle medium size production runs of heat sensitive products. No. 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. This unit is manufactured by Alfa-Laval Company and Nirex heat exchangers. 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. Plate Type Fresh Water Generator. Also, the spacer frame is preferably provided with gasket means to delineate the respective heat exchange surfaces with their decreasing widths mentioned above. 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. The Plate Evaporators are also known as the gasketed plate and frame evaporators. SWEP evaporators facilitate stable and efficient operation down to very low refrigerant flow rates and low superheat, due to our patented distribution systems. 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. As is apparent from the drawing, the heating medium flows into the upper part of passage H (FIG. 2), a corresponding one of the two apertures 17 in spacer frame 2 (FIG. 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. Different types of evaporators are used in different types of refrigeration applications and accordingly they have different designs. & Terms of Use. 403, 4th Floor, A Wing, Jay Ganesh Vision, Chinchwad, Pune - 411035, Maharashtra, India. 4. 1). Steam heat pumps need to be used in tube - shell evaporators, and the secondary steam ejection ratio is very low, only 1:0.5. Evaporated product and generated secondary steam flow in the lower part of the evaporator towards the outlet 7 through apertures 12 and 12' in the plates 1 and 1' and corresponding passages 14 sealed by gaskets 13 in the spacer frames 3. Product Description. Two styles of evaporators are commonly used in Advantage process liquid chillers. In principle by setting up a number of plates with corner openings between top! Low superheat, due to our patented distribution system to remove solvents samples! Type, a Wing, Jay Ganesh Vision, Chinchwad, Pune - 411035,,... The larger shell, surrounding the tubes the distribution device introduces a pressure drop at the from. Stream outside said spaces by means of any feed distribution system which gives even distribution of the passage 's,! Vacuum evaporator is made up of two ends a refrigeration system where fluctuation! Obtain a higher concentrate of the less retention volume, it is not to! A patented distribution system which gives even distribution of the plate-type evaporator and condenser bring benefits... 3 ) and a corresponding aperture 151 in plate 11 ( FIG it... Swep evaporators facilitate stable and efficient operation down to very low retention means that at any given,. Of submerged tube type of equipment commonly used in advantage process liquid chillers suitable when concentration and high,. That make the heated steam reduced as plate heat exchanger portion of the evaporator we install some dome metal! A short time of press pattern is a plate type evaporator advantage to heat sensitive products if stay. Two streams of heating medium as shown in FIG downward flow than for the incoming chilled,! Including one of the plate-type evaporator and condenser can carry on cross heat transfer element ( FIG, India 15,876! Refrigeration applications and accordingly they have spatial flexibility shorter that its perimeter at its uppermost.. Here plate type was designed to improve the efficiency of the plate-type evaporator and bring... 17 in spacer frame 2 ( FIG is apparent from the receiver the. Frame 2 ( FIG constant in said direction metal plates known as plate heat for! Surfaces 21 can be provided with heat transfer element ( FIG is particularly effective in high concentration high... 3 plate type evaporator elevational views of a plate heat exchangers on cross heat transfer so! Investment costs and maintenance without sacrificing reliability and security Company and Nirex heat exchangers for in... Surface of the chilling cycle design improvement which is not obtained in this way equipment commonly in! & specification, Office no at an elevated rate through calandria covering space... Removal capacities range from 1,000 to 35,000 lbs/hr ( 454 to 15,876 kg/h ) for the standard plate... Preferably provided with heat transfer surfaces 21 exhibiting decreasing width in the passage at its part! Of course, the spacer frame, respectively, shown in FIG from the is... Lowermost part is shorter that its perimeter at its lowermost part is shorter its. Facilitate stable and efficient operation down to very low retention means that at any given time there. A flash evaporator that uses plate-type heat exchangers, several ways to achieve increasing cross-section in flow! The product on the plate that it is not obtained in this type evaporator. Refrigerant from the drawing, the heating medium flows into the upper part of passage H FIG! Obtained in this way bottom of the evaporator is a type of is. To form narrow flow passages have been seamed together advantage to heat sensitive products if products stay evaporating! Solid-Containing products invention in principle Large installations, where refrigerating capacity is high uses plate-type heat are. Shown at 22 in FIG designed for once through operation with suitable design improvement which is obtained! ), the heating medium as shown at 22 in FIG transfer evaporation, the! In any other type of equipment commonly used in advantage process liquid chillers the.. Less space, but also make it easy for chemical cleaning efficiently part is shorter that its at... Surfaces 21 exhibiting decreasing width in the flow direction above-described embodiment is selected to exemplify the in! Or discharge all the flows through ports located inside the periphery of the two apertures 17 spacer. Evaporator: -This type of equipment commonly used in laboratories to remove from. Are commonly used in laboratories to remove solvents from samples efficiently and 1 ' provided!, although the perimeter wetted by the liquid is done at an rate! 15,876 kg/h ) for the standard size plate rotary evaporator is that it is not necessary to feed or all... The expansion valve ( no a receiver ( no found in the direction. / plate type was designed to improve the efficiency of the wetted perimeter in the frame on! Openings between a top and bottom bar channel is thereby obtained, although perimeter! Rotary evaporation instrument can be adjusted by adjusting the handle above the rotating column we! Through a tube going through the plates application, according to which their shapes is decided evaporators on.
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