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What is a scraped surface heat exchanger and how it works differently from static heat exchangers
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00:00:08.321 --> 00:00:11.678 A scraped surface heat exchanger is an industrial heat exchanger. 00:00:11.836 --> 00:00:15.098 It’s an extremely versatile heat exchanger used for very viscous, 00:00:15.389 --> 00:00:18.143 thick, sticky products, large particulate products, 00:00:18.350 --> 00:00:21.062 and very challenging applications from a fouling perspective. 00:00:21.419 --> 00:00:25.108 The best way to describe it that I’ve found is an analogy with the home. 00:00:25.340 --> 00:00:29.362 When you’re cooking in a pan, a spatula is required. 00:00:29.561 --> 00:00:32.782 Because if you just apply the heat to the pan, the food is going to burn. 00:00:32.932 --> 00:00:37.245 The spatula is physically scraping and manipulating that product so it doesn’t burn. 00:00:37.436 --> 00:00:39.122 And that’s exactly what a scraped surface heat exchanger does. 00:00:39.164 --> 00:00:42.000 It’s a large industrial spatula so to speak. 00:00:42.133 --> 00:00:46.838 The relevant applications for scraped surface technology are just so wide and varied. 00:00:46.929 --> 00:00:54.012 They span across food, personal care, chemical, pharmaceutical, protein, protein by-products. 00:00:54.120 --> 00:00:58.475 There are so many applications where the scraped can be used because it’s extremely flexible. 00:00:58.599 --> 00:01:03.646 Gasketed plate-and-frame or tubular heat exchangers have no moving parts, 00:01:03.713 --> 00:01:05.607 so I’ll refer to them as static heat exchangers. 00:01:05.764 --> 00:01:11.237 We can design them and Alfa Laval does an amazing job optimizing them, but at some point they reach their limitations. 00:01:11.456 --> 00:01:15.408 You get to the point where you physically need to have something mechanically removing the fouling layer. 00:01:15.530 --> 00:01:17.952 And that’s where the scraped surface heat exchanger comes in. 00:01:18.147 --> 00:01:21.748 Many times these static systems can 00:01:21.879 --> 00:01:24.542 result in very high pressures if the products are becoming very thick. 00:01:24.740 --> 00:01:27.712 And that’s where the scraped surface heat exchanger comes in as well. 00:01:27.890 --> 00:01:29.714 The hydraulic diameter can be much larger. 00:01:29.800 --> 00:01:32.967 We can design that in such a way to minimize pressure drop. 00:01:33.259 --> 00:01:37.180 That can have an impact on the overall production of the system, the performance of a system, 00:01:37.279 --> 00:01:39.224 and the performance of all the equipment in the system. 00:01:39.421 --> 00:01:45.522 As far as the differences between static and scraped surface heat exchangers in terms of product changeover, 00:01:45.680 --> 00:01:48.274 I would say that the scraped surface heat exchangers are extremely versatile, 00:01:48.358 --> 00:01:51.027 and they have a very low product hold-up volume. 00:01:51.194 --> 00:01:55.073 When a customer needs to finish a process and enter cleaning, 00:01:55.149 --> 00:01:58.827 or transition from one product to the next, this is where the scrape has an advantage. 00:01:59.018 --> 00:02:02.330 As the product is transitioning from one to the next, 00:02:02.404 --> 00:02:05.250 there’s very little hold-up volume and very little intermixing. 00:02:05.490 --> 00:02:07.752 They can really maximize their product gains. 00:02:07.961 --> 00:02:12.674 From a customer’s perspective, if they’re trying to maximize uptime and produce all of their products, 00:02:12.755 --> 00:02:15.093 the scraped surface heat exchanger is a no brainer. 00:02:15.176 --> 00:02:17.011 It’s just the most flexible solution on the market.
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