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Save to read list Published by Lucy Stewardson , Editorial Assistant World Cement, Monday, 30 September 2019 09:50

There are three main types of heat exchangers – plate, shell and tube, and air cooled. They work in different ways and are suited to various applications, but, essentially, they all fulfil the same task: transferring heat from one fluid to another.

Heat exchangers are primarily used in the cement sector for ancillary cooling on plants and machinery, so whatever the size or location of the plant there is bound to be some sort of heat exchanger system there. Aggregate crushing, in particular, is a process that requires power levels that generate vast amounts of heat and, therefore, requires heat exchanges to cool them and keep them online and operating efficiently.

How do heat exchangers work?

Shell and tube systems function by passing a fluid through a set of tubes that is located within a sealed shell that contains another fluid. The liquids can move in the same direction (parallel flow), opposite directions (counter flow), or at right angles (cross flow).

Plate heat exchangers comprise many thin metal plates to provide a large surface area with narrow channels to transfer the heat rapidly. Air cooled heat exchangers tend to be used where ambient air is the cooling mechanism. The air is forced or drawn through a tube bundle or core by fans.

Which type of heat exchanger?

The more a supplier understands a business, the better they will appreciate what is important to it. In the cement sector, this is most commonly the ability to supply systems designed to meet the specific needs of individual plants and their operations. For example, some heat exchange systems are fitted with metallic fins to help with cooling processes. Their performance will be compromised by the corrosive dust which is inevitably the result of cement production. Thornhill offers a range of coatings that can be applied to various sorts of heat exchangers, and fins to protect them, to increase their efficiency and longevity, as well as providing onsite cleaning to improve cooling efficiency.

Read the article online at: https://www.worldcement.com/special-reports/30092019/simon-tin-provides-overview-of-heat-exchangers/

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