FANS
Why Choose a Scraped Surface Heat Exchanger?
Why Choose a Scraped Surface Heat Exchanger?
Typically referred to as scraped surface heat exchanger (SSHE) in the industry, they are used for heating or cooling a product inside of a rotating tube. The product is continuously scraped from the inner cylinder wall, which prevents the build-up of fouling on the internal surface and enhances heat transfer. The design also provides mixing action, ensuring that the whole product is heated or cooled evenly.
SSHEs are commonly used to cool viscous foods like strong salad dressing, margarine, chocolate, peanut butter & fondant as well as products that crystallize during the processing such as ice cream and shortenings. Unlike conventional heat exchangers that have to contend with high pressure drop due to the clogging of the fluid, a scraped surface heat exchanger has a low one, which allows higher temperature gradients for better heat transfer.
The patented scraper system in a SSHE is able to clean the internal surface of the tube by oscillating the blades, which can be designed with any number of blades and rotated at various speeds. The choice of the number of blades is based on an empirically based compromise between capital cost, acceptable speed of rotation and liquid viscosity. Due to the rotating parts, maintenance charges can be relatively high.
There are many reasons to choose a continuous scraped surface heat exchanger, which is why Armstrong Chemtech offers a wide selection of these units, including both single and double-wall SSHEs, which come in a variety of materials for specific applications. The entire range is fully tailored to the process requirements and backed by years of experience in heat transfer.
A continuous scraped surface heat exchanger is a double pipe element commonly used in cooling viscous and cooling crystallization duties. It is ideally suited for shear sensitive products, as the rotating scraping technology continuously removes fouling material from the internal surface of the cylinder and avoids shear during the processing, which preserves product quality, allows gentle handling and reduces pressure drop at the inlet.
This unique technology is used in a variety of food and beverage processing industries, such as dairy, petfood and cosmetics. It is particularly useful for cooling viscous and crystallizing products and in separating beeswax from bulk lubricating oil by using the boiling point differential between these two substances to cause the beeswax to separate from the lubricating oil, which is then pumped out of the tank.
The continuous scraped surface heat exchangers offered by Alfa Laval are highly efficient and provide robust heat transfer for a variety of demanding applications. They are also backed by years of thermal exchange expertise, making them an ideal choice for shear sensitive products such as sauces, soups, condiments and jams. To ensure the best performance of your CSSE, it is important to use genuine OEM replacement parts that are engineered specifically for this type of application. Third-party aftermarket products may void your warranty, create safety hazards for your employees and disrupt the function of your equipment.
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