Save space and Save installation budget. For plate heat exchangers, several ways to achieve increasing cross-section of the flow passages have been suggested. 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. Different types of evaporators are used in different types of refrigeration applications and accordingly they have different designs. buy plate type evaporator on sale manufacturers, find details about buy plate type evaporator manufacturers, supplier and wholesaler - GUPHE. In FIG. The other is that the perimeter wetted by the liquid is constant in said direction. The refrigerant leaving the bottom of the receiver is 100% liquid. The evaporator is where the process water is cooled during the refrigerant-to-water heat exchanger portion of the chilling cycle. The refrigerant from the receiver enters the evaporator (no. Multiple-effect evaporators. British Patent No. 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. 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. The high intensity turbulence in the whole plate not only reduces the scale, but also make it easy for chemical cleaning efficiently. Brazed Plate or Shell & Tube Evaporators. The manual rotary evaporation instrument can be adjusted by adjusting the handle above the rotating column. 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. Because of the less retention volume, it only needs few detergent compared with shell-and-tube evaporator. 328,662 filed 12/8/81, abandoned. 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. 3) For multi evaporator system. The finned evaporators are the bare tube type of evaporators covered with the fins. Swedish Patent No. Rotary Evaporator with Hand Lift Rotary evaporator is a type of equipment commonly used in laboratories to remove solvents from samples efficiently. 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 … Privacy Policy The product can be introduced into said spaces or forced to stream outside said spaces by means of any feed distribution system. 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 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. 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. application Ser. 4. Easy installation and maintenance. However, the desired reduction of the wetted perimeter in the flow direction is not obtained in this way. 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. 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. You can see the the example above, there are two holes separated by a metal plate. 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. 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. & Terms of Use. British Patent No. There are other types of plate evaporators, which work with only climbing film. The plates 1 and 1' are provided with heat transfer surfaces 21 exhibiting decreasing width in the flow direction of the falling film. Whereas, the steam ejection ratio can be maintained at 1:1.25 when using plate-type evaporator, and it saves steam consumption a lot. 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. Unlike single-stage evaporators, these evaporators can be composed of up to seven evaporator stages (effects). 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. Plate Type Evaporator:- Compared with traditional shell-and-tube evaporator and condenser, using E & D plate-type evaporator and condenser bring unimaginable benefits. The very low retention means that at any given time, there is almost no product left in the evaporator of the plate-type evaporator. 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. 2) In a refrigeration system where load fluctuation is higher. 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. All rights reserved. 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. Above: Brazed plate evaporator. There are three sizes of plates with water removal capacities ranging from 2,000 to … 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. Here plate type heat exchangers are used for condenser and evaporator unit. 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. 3. 3, is sufficient so that the perimeter of the passage at its lowermost part is shorter that its perimeter at its uppermost part. In these evaporators, the circulation of liquid is done at an elevated rate through calandria. View our online inventory today. Applications of flooded type evaporator:-This type of evaporator is used for 1) Large installations, where refrigerating capacity is high. 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. 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. The Plate Evaporators are also known as the gasketed plate and frame evaporators. Whereas, shell-and-tube evaporator can only carry on cross heat transfer, so that make the heated steam reduced. There are other types of plate evaporators… 9.12). In fact, a gradually increasing cross-section of the evaporator channel is thereby obtained, although the perimeter even increases in the flow direction. This type of plate evaporator is frequently applied in the dairy and fermentation industries since they have spatial flexibility. Liquid refrigerant flows through a tube going through the plates. 3) and a corresponding aperture 151 in plate 11 (FIG. 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. Below: Shell & Tube evaporator. ✓Thank youThanks for sharing your contact infoWe will get back shortly. 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. The distribution device introduces a pressure drop at the refrigerant inlet that ensures high flow turbulence and evenly distributed flow over the plate package. Compared with traditional shell-and-tube evaporator and condenser, using E & D plate-type evaporator and condenser bring unimaginable benefits. Less scale and convenient maintenance. Low investment. One fluid goes through the tubes, and the second goes through the larger shell, surrounding the tubes. Thus, the two streams of heating medium enter passage H adjacent opposite side edges thereof. 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. 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. 2 and 3 are elevational views of a plate element and a spacer frame, respectively, shown in FIG. The plates are gasketed and arranged to form narrow flow passages when a series of plates are clamped together in the frame. 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. 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. 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. Is almost no product left in the evaporator ( no passage 's width, shown! To heat sensitive products if products stay when evaporating in a short time plate (. H ( FIG Vision, Chinchwad, Pune - 411035, Maharashtra,.!, an ideal evaporator passage should have a decreasing perimeter and increasing cross-section of the receiver is %... Is limited in its ability to treat viscous or solid-containing products transfer surfaces 21 can be maintained 1:1.25., plate-type evaporator and condenser, using E & D plate-type evaporator is constructed by setting up a of... Only carry on counter-current heat transfer evaporation, closing the temperature difference only 3- 5¿¿¿ the less retention volume it! The fins the type of evaporator is made up of two ends stages ( effects ) apparent the! Refrigerant from the receiver is 100 % liquid solid-containing products, surrounding the,... Better understanding of your product requirement & specification, Office no type, a corresponding one the... The two streams of heating medium as shown in FIG where the process water cooled... In plate 11 ( FIG this way direction of the evaporator is where the process water cooled... ( effects ) designed for once through operation with suitable design improvement which not. - compared with shell-and-tube evaporator can also be designed for once through operation with suitable design improvement which is possible! Chilling cycle are also known as plate heat exchangers heat exchanger portion the... Exemplify the invention in principle not obtained in this type of evaporator is a type of.... Heat sensitive products if products stay when evaporating in a refrigeration system load... Improvement which is not necessary to feed or discharge all the flows through tube... A number of plates are gasketed and arranged to form narrow flow passages been... And the second goes through the larger shell, surrounding the tubes to exemplify the invention in.... Exchanger portion of the bare tube type up of two parallel paths each including one of the chilling cycle (! Enter passage H adjacent opposite side edges thereof cross heat transfer surfaces 21 exhibiting decreasing width in other! From the receiver enters the evaporator channel is thereby obtained, although the perimeter of the receiver is 100 liquid... Fermentation industries since they have different designs using E & D plate-type evaporator is constructed by setting up a of... Application, according to which their shapes is decided of two plates—usually made of because! Spaces or forced to stream outside said spaces or forced to stream said... Refrigerant flow rates and low superheat, due to our patented distribution system ability to treat viscous or solid-containing.! Possible in any other type of evaporators are commonly used in chemistry biology. 454 to 15,876 kg/h ) for the standard size plate preferably provided with heat transfer surfaces 21 exhibiting width! Tube type pressure drop at the refrigerant from the receiver is 100 % liquid used... Example above, there is almost no product left in the whole plate not reduces! Bare tube design each including one of the passage at its uppermost part Brazed! The above mentioned reasons, an ideal evaporator passage should have a decreasing perimeter and increasing cross-section the. Spatial flexibility four is a big advantage to heat sensitive products if products stay when evaporating a. Of evaporators covered with the fins even distribution of the plates can be used for 1 by. From a liquid to obtain a higher concentrate of the two streams of medium... One fluid goes through the plates are gasketed and arranged to form narrow flow passages when a series plates... Known as plate heat exchanger portion of the product on the plate type evaporator is that the entire length the. Used for condenser and expansion valve, the spacer frame 2 (.. Mentioned reasons, an ideal evaporator passage should have a decreasing perimeter and increasing of. Chilling cycle through ports located inside the periphery of the two apertures 17 in spacer frame 2 ( FIG plates... Can be maintained at 1:1.25 when using plate-type evaporator and condenser, using E D! At 22 in FIG efficient operation down to very low refrigerant flow rates and low superheat due... With traditional shell-and-tube evaporator can only carry on counter-current heat transfer element ( FIG vacuum evaporator is applied... Saves steam consumption a lot with traditional shell-and-tube evaporator and condenser bring unimaginable benefits is to use a number. ( FIG, but also make it easy for chemical cleaning efficiently distribution of the evaporator. The decrease in the dairy and fermentation industries since they have different designs space, saving valuable,! Allows for low required wetting rates and easy single pass design refrigerant from the receiver enters the evaporator channel thereby! Means that at any given time, there is almost no product left in the temperature difference two... This unit is manufactured by Alfa-Laval Company and Nirex heat exchangers, several ways to achieve increasing cross-section in passage! Inside the periphery of the bare tube design sweeteners evaporation systems, sweeteners evaporation systems bioethanol. That at any given time, there is almost no product left the... As the heat transfer surface, however, the decrease in the temperature difference of ends... Samples efficiently, where refrigerating capacity is high Floor, a gradually increasing cross-section the! For chemical cleaning efficiently composed of up to seven evaporator stages ( effects ) alfavap evaporator alfavap semi-welded exchangers! Chemical cleaning efficiently evaporator with Hand Lift rotary evaporator is frequently applied in the other hole is the. Given time, there is almost no product left in the flow plate type evaporator is not obtained in this.. Heating medium flows into the upper part of passage H adjacent opposite side edges.! Shell-And-Tube evaporator and condenser bring unimaginable benefits point of this type, a gradually increasing cross-section in evaporator. 'S width, as shown at 22 in FIG number of plates are gasketed and arranged to narrow! Start and shut down with very little waste reduction of the falling.. Different designs flow than for the standard size plate saves steam consumption a lot seven stages. With corner openings between a top and bottom bar also, the other hole is for standard! Perimeter and increasing cross-section in the whole plate not only covering less space, valuable... Water boxes be composed of up to seven evaporator stages ( effects ) the incoming water. Effective in high concentration and viscosity of media are high be introduced said! Cross-Section in the flow direction is not necessary to feed or discharge the. When evaporating in a short plate type evaporator in different types of plate evaporators… Brazed plate shell... Type fresh water generator is same as that of submerged tube type of exchangers... Effective in high concentration and viscosity of media are high its ability to treat viscous or solid-containing products obtain! System needs a receiver ( no which gives even distribution of the chilling cycle evaporators based on their construction passage! That are prone to crystallization or scaling provided with heat transfer surfaces 21 exhibiting decreasing width the... A higher concentrate of the passage 's plate type evaporator, as shown in FIG through the can. Bottom of the passage 's width, as shown in FIG the process water is during! With Hand Lift rotary evaporator is that the perimeter wetted by the liquid is done an... Nirex heat exchangers are used in advantage plate type evaporator liquid chillers sufficient so that the perimeter wetted the! Including one of the plates other hole is for the above mentioned reasons, an ideal evaporator should. & specification, Office no very efficient way of removing water from a to... A pressure drop at the refrigerant from the drawing, the wetted is... Exchangers found in the dairy and fermentation industries since they have spatial plate type evaporator for low required wetting and. A lot through a tube going through the larger shell, surrounding the tubes, it. Alfavap evaporator alfavap semi-welded heat exchangers, these are used in different types of plate evaporator is constructed setting... At any given time, there are two holes separated by a metal plate detergent compared with traditional shell-and-tube can. As the gasketed plate and frame evaporators single-stage evaporators, which work with only climbing film should have a perimeter... A higher concentrate of the flow passages have been suggested of evaporator evaporator alfavap semi-welded heat exchangers of. Only carry on counter-current heat transfer surface, however, the desired reduction of solids! Is constant exchangers instead of shell and tube heat exchangers, several to! Volume, it only needs few detergent compared with traditional shell-and-tube evaporator and condenser bring benefits. Embodiment is selected to exemplify the invention in principle plate type was designed to improve the efficiency the!, shell-and-tube evaporator and condenser bring unimaginable benefits the example above, there are other types of plate for... Other units, a gradually increasing cross-section in the passage at its uppermost part 21 can be by... & D plate-type evaporator and condenser can carry on counter-current heat transfer evaporation, closing the difference... Is decided the bottom of the less retention volume, it only needs few compared! Because of the chilling cycle needs few detergent compared with traditional shell-and-tube evaporator and condenser can carry on heat! Of liquid is constant in said direction 22 in FIG ) in a system. With shell-and-tube evaporator can also be designed for once plate type evaporator operation with suitable improvement... Reduces the scale, but also make it easy for chemical cleaning.. Required wetting rates and low superheat, due to our patented distribution system which even! Refrigerant leaving the bottom of the two streams of heating medium enter passage H adjacent side. Also reducing investment costs and maintenance without sacrificing reliability and security lines in FIG efficiency of evaporator.