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Abstract

In a vessel (1), several mutually parallel evaporator tubes (2) are arranged which, on their outside, are surrounded by heating steam introduced into the interior (1a) of the vessel. A coaxial displacement body (3) is arranged in the interior of the evaporator tubes (2). A gap (5) is formed between the displacement body (103) and the surrounding evaporator tube (2). The displacement bodies (3) are fixed to a bottom (6) which is demountably joined to the vessel (1). The displacement bodies (3) can be removed by removing the bottom (6). The pre-evaporated product, introduced from below and leaving the evaporator tubes (2) at the top, is passed to a vapor-release vessel (11) in which a separation of vapors and concentrate takes place. Each displacement body (3) is formed by a rifled tube which has been provided by deformation with at least one spirally running recess (4). The product flows through both the gap (5) and this recess (4). A whirling motion which entails an increase in turbulence is thus imparted to the product stream. Since the outside of each displacement body (3) is formed by surfaces with steady mutual transitions, no dead zones favoring deposition are present. The risk of fouling is therefore low so that the evaporator is also suitable for the treatment of salt-containing liquids. The high turbulence which can be achieved also makes this evaporator suitable for the treatment of intrinsically viscous or thixotropic products.

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