Hydrocyclones

This device is particularly unique as it separates solids and liquids by centrifugal principles, but contains no moving parts. The principle of the machine is illustrated in Figure 5. The slurry or fluid to be separated is pumped at high speed and enters the conically shaped machine tangentially. The conical shape causes the flowing liquid to swirl or rotate within the cone, with the result that suspended solids move to the wall while clarified liquid remains in the centre of the cone. This clarified liquid is drawn off at the top of the cone while the separated solids move to the bottom of the chamber for removal. The degree of separation is generally coarse; however, hydrocyclones find use in applications such as removal of sand or grit from fruit mash streams intended for juice extraction, to protect expensive equipment such as decanter scrolls or disc stack deslugging mechanisms from premature wear. They find use in pulp mills for paper fibre removal from liquid streams. These units are used extensively to remove particles from gas streams such as flue gases and as a particle collection mechanism for spray driers used in the production of food powders of various kinds. While the medium of drying and particle conveyance is air, and the prefix 'hydro' does not strictly apply, the principle is the same. Hydrocyclones may precede in line with filtering centrifuges since they can be used to concentrate the centrifuge feed and increase the efficiency of the basket or filter centrifuge.

Figure 5 Schematic diagram of a hydrocyclone. 1, Feed; 2, apex nozzle; 3, grit pot; 4, outlet, solids; 5, valve; 6, discharge, clarified liquid. Reproduced with permission from Westfalia Separator AG, Oelde, Germany.
Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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