Vacuum labyrinth heat exchanger
Vacuum exchangers have gained more and more grounds in oil deodorization and edible fats plants, to meet quality levels currently required. They work in a similar way to hair pin exchangers, and they also have the advantage of working counter current, avoiding crosses that can bring the temperature difference available down. Except that, in this case, the shell side is open, and connected to the vacuum system. The flat bottom and half cylindrical shell equipment, is made up of a series of channels, forming a labyrinth. Immersed in the channels there is a “U” tube bundle, where through the other liquid, which may be thermal oil,- as in the heaters case- or oil – as in the recoverers case-, circulates and cools down the deodorized oil, preheating the feeding phase. There is a steam pipe with holes running along the bottom of the channels, for stripping and agitation purposes, so improving the heat transference. Loss of head loss is only important for the fluid running inside the pipes, since in the channels it is inconsiderable.