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. 5). 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. Easy installation and maintenance. Spacer frame 3 has gaskets 23 for sealing against adjacent plates 1 and 11 to define passage H. As previously mentioned, the width of each of the two heat exchange surfaces defining a passage E decreases in the flow direction to provide the passage with a perimeter which decreases in said direction. 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. 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. 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. Finned evaporator. 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. 2 and 3 are elevational views of a plate element and a spacer frame, respectively, shown in FIG. The refrigerant leaving the bottom of the receiver is 100% liquid. 1), the decrease in the passage's width, as shown at 22 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. Shell and tube heat exchangers are aptly named – the primary components are a tube pack (above, right) and a shell to contain them. 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 … 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 evaporator is where the process water is cooled during the refrigerant-to-water heat exchanger portion of the chilling cycle. 403, 4th Floor, A Wing, Jay Ganesh Vision, Chinchwad, Pune - 411035, Maharashtra, India. 3, is sufficient so that the perimeter of the passage at its lowermost part is shorter that its perimeter at its uppermost part. Typical applications for Plate Evaportator are sugar refinery evaporation systems, sweeteners evaporation systems, bioethanol and caustic evaporation. The Plate Evaporator is constructed by setting up a number of plates with corner openings between a top and bottom bar. One hole is for the incoming chilled water, the other hole is for the outgoing chilled water. Plate evaporators: In this type, a plate heat exchanger serves as the heat transfer element (Fig. & Terms of Use. 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. In U.S. Pat. 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. Less scale and convenient maintenance. 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. For plate heat exchangers, several ways to achieve increasing cross-section of the flow passages have been suggested. ✓Thank youThanks for sharing your contact infoWe will get back shortly. © 2004-2021 FreePatentsOnline.com. 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. 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. Another suggestion is to use a larger number of plate interspaces for the downward flow than for the upward flow. The Falling Film Plate Evaporator has a patented distribution system which gives even distribution of the product on the plate. AlfaVap evaporator AlfaVap semi-welded heat exchangers are rising film plate evaporators and are suitable when concentration and viscosity of media are high. Thus, the two streams of heating medium enter passage H adjacent opposite side edges thereof. generation, Process of and apparatus for transferring heat, <- Previous Patent (Auxiliary power syst...). evaporator, compressor, condenser and expansion valve, the flooded system needs a receiver (no. 2, Figure 6.44) and evaporates due to the he… 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. Two styles of evaporators are commonly used in Advantage process liquid chillers. 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. 5. 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. Small floor occupation, low building cost. Particularly if pressed plates are used, the press pattern must be designed so that reasonable press matrix costs and a minimal number of press patterns or plate embodiments are obtained. There are other types of plate evaporators… 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. British Patent No. 9.12). Here we have classified the evaporators based on their construction. 1 is taken. 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. 2. 1. 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. Industrial line is an extremely versatile range of heat exchangers for use in all types of industries. There are other types of plate evaporators, which work with only climbing film. Compared with traditional shell-and-tube evaporator and condenser, using E & D plate-type evaporator and condenser bring unimaginable benefits. 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. The refrigerant from the receiver enters the evaporator (no. British Patent No. Unlike single-stage evaporators, these evaporators can be composed of up to seven evaporator stages (effects). Also known as plate heat exchangers, these are used to process liquors that are prone to crystallization or scaling. 1) by way of two parallel paths each including one of the two apertures 15 in plate 1 (FIG. Swedish Patent No. Water removal capacities range from 1,000 to 35,000 lbs/hr (454 to 15,876 kg/h) for the standard size plate. Save space and Save installation budget. And tube heat exchangers, these are used in chemistry, biology and fields... Used plate type evaporator process liquors that are prone to crystallization or scaling are holes! 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