What is a scraped surface heat exchanger and how it works differently from static heat exchangers

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Language: en

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A scraped surface heat exchanger
is an industrial heat exchanger.
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It’s an extremely versatile heat
exchanger used for very viscous,
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thick, sticky products,
large particulate products,
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and very challenging applications
from a fouling perspective.
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The best way to describe it that I’ve
found is an analogy with the home.
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When you’re cooking in a pan,
a spatula is required.
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Because if you just apply the heat to
the pan, the food is going to burn.
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The spatula is physically scraping and
manipulating that product so it doesn’t burn.
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And that’s exactly what a scraped
surface heat exchanger does.
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It’s a large industrial spatula so to speak.
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The relevant applications for scraped surface
technology are just so wide and varied.
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They span across food, personal care, chemical,
pharmaceutical, protein, protein by-products.
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There are so many applications where the scraped
can be used because it’s extremely flexible.
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Gasketed plate-and-frame or tubular
heat exchangers have no moving parts,
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so I’ll refer to them as static heat exchangers.
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We can design them and Alfa Laval does an amazing job
optimizing them, but at some point they reach their limitations.
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You get to the point where you physically need to have
something mechanically removing the fouling layer.
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And that’s where the scraped
surface heat exchanger comes in.
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Many times these static systems can
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result in very high pressures if the
products are becoming very thick.
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And that’s where the scraped surface
heat exchanger comes in as well.
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The hydraulic diameter can be much larger.
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We can design that in such a
way to minimize pressure drop.
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That can have an impact on the overall production
of the system, the performance of a system,
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and the performance of all
the equipment in the system.
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As far as the differences between static and scraped
surface heat exchangers in terms of product changeover,
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I would say that the scraped surface
heat exchangers are extremely versatile,
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and they have a very low
product hold-up volume.
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When a customer needs to finish
a process and enter cleaning,
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or transition from one product to the next,
this is where the scrape has an advantage.
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As the product is transitioning from one to the next,
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there’s very little hold-up volume
and very little intermixing.
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They can really maximize their product gains.
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From a customer’s perspective, if they’re trying to
maximize uptime and produce all of their products,
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the scraped surface heat
exchanger is a no brainer.
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It’s just the most flexible
solution on the market.
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Phone: +7 343 216 77 75

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