Scraped surface heat exchangers have been used for tough heat transfer purposes involving viscous fluids or where fouling is a matter, such as evaporation processes. The most typical kind of scraped floor heat exchanger (SSHE) makes use of a rotating shaft with blades or augers which scrape the floor of the tube. The in style HRS R Series is predicated on this approach. However, the design just isn’t optimum for every scenario, and so HRS developed the Unicus Series of reciprocating scraped floor heat exchangers.
The Unicus Series of reciprocating scraped surface heat exchangers is good for viscous merchandise such as cream and tomato juice, as nicely as products containing fruit pieces or particles.
IT STARTS WITH DESIGN
The HRS Unicus Series is particularly designed to provide the improved heat switch of a traditional SSHE, however with a delicate action to preserve the quality and integrity of delicate food products similar to cheese, yoghurt, ice cream, meat paste, and products containing whole items of fruits or greens. Over Save , numerous different scraper designs have been developed, which means that every utility, from processing curds to heating sauce or pasteurizing fruit compotes may be dealt with in the most efficient but light method possible. Other purposes where the Unicus Series has been useful embody handling meat slurry and mince, and processing yeast-malt extracts.
The hygienic design makes use of a patented stainless-steel scraping mechanism that strikes hydraulically forwards and backwards inside every inside tube. The movement performs two key functions: it minimizes potential fouling by maintaining the tube wall clear and also creates turbulence throughout the materials. Together, these actions enhance the speed of warmth switch within the material, creating a extremely efficient course of that’s ideal for viscous and high fouling supplies.
Since they are controlled individually, the velocity of the scrapers could be optimized for a particular product being processed, in order that materials which are prone to shear stress or stress injury (such as creams and custards) may be dealt with delicately to forestall damage whereas still providing high levels of warmth transfer. The Unicus Series has proven significantly helpful in handling viscous meals merchandise the place texture and consistency are essential attributes. For instance, some creams or sauces could shear when subjected to excess strain, making them unusable. The Unicus means that effective warmth switch can be carried out at low pressures which overcomes these issues.
HRS UNICUS SERIES UP CLOSE
Each Unicus SSHE consists of three elements: a hydraulic cylinder and power pack (although in smaller items a pneumatic cylinder may be provided instead), a separation chamber to ensure hygiene and protect product separation from the motor, and the heat exchanger itself. The heat exchanger consists of a number of tubes, every of which contains a stainless-steel rod to which the suitable scraping elements are fitted. Using a variety of food-safe materials including Teflon and PEEK (polyether ether ketone), these provide completely different internal geometry setups in accordance with the applying, similar to 120-degree scrapers for giant particulates and 360-degree scrapers for viscous fluids with out particulates.
Hidden can additionally be fully scalable by growing the shell diameter and including more interior tubes from a single tube up to eighty in a single shell. A key characteristic is the specially designed seals which separate the internal tube from the separation chamber, tailor-made to the product application. These seals prevent leakage of the product and ensure internal and exterior hygiene. A commonplace range of fashions for meals processing present heat transfer areas from 7 to 107 square ft, whereas larger models up to practically 1,300 sq. feet can be made for particular uses.
EXCELLENCE IN ACTION
One area the place the Unicus Series excels is in evaporation functions, the place the prevention of fouling is especially necessary. HRS has a selected model of the Unicus to be used in evaporation items where quantity reduction of the material is essential. The scraping motion retains the heat transfer surfaces clear so that Unicus evaporators can focus materials to a level that is unattainable using conventional technologies. Unicus evaporators can be utilized in multi-effect setups or in combination with mechanical vapor recompression.
Matt Hale is international gross sales and marketing director for HRS Heat Exchangers. Located in Atlanta, Georgia, HRS Heat Exchangers is a part of the HRS Group, which operates at the forefront of thermal expertise, providing innovative heat transfer solutions worldwide throughout a diverse vary of industries. With forty years’ experience within the meals and beverage sector, specializing in the design and manufacture of an in depth range of turnkey systems and elements, incorporating corrugated tubular, and scraped floor warmth exchanger expertise, HRS models are compliant with global design and business requirements.For extra data, go to www.hrs-heatexchangers.com.
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