Method of increasing potential of downfalling thin film tube nest type heat exchanger
A heat exchanger and tube-bundle technology, applied in the field of tube-bundle heat exchangers, can solve the problems of increasing heat exchange area, increasing production capacity, increasing costs, etc.
Inactive Publication Date: 2004-10-27
UREA CASALE SA
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Problems solved by technology
[0010] Although a descending film heat exchanger constructed in the manner schematically described above is advantageous from various points of view, it has significant disadvantages that first arise when the need to address increases in production capacity
[0011] In fact, in this case the prior art teaches or utilizes other thin film heat exchangers of the form considered, preferably by connecting them in parallel with the existing ones, or by using new ones of suitably increased size. A heat exchanger for the complete replacement of this heat exchanger in order to have an increased heat exchange area; in the first case at least a large number of more complex configurations of the chemical plant requiring the installation of the exchanger will be required, in the second case , need to bear significantly increased costs as investment and operating costs
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[0018] Referring to Figure 1, a so-called falling film heat exchanger 1 according to the prior art comprises an outer shell 2 having a vertical axis A-A and closed at opposite ends by respective upper walls or ends 3 and lower walls or ends 4, so that Said upper and lower walls are fixed to the shell by means of respective flanges 3a and 4a; tube bundle 5, having vertical tubes 5a, and mounted longitudinally inside said shell 2, with respective upper and lower tube plates 6, 7 fixed in an airtight manner along the periphery to the shell itself.
[0019] Due to the presence of said tube sheets 6, 7 three chambers 8, 9, 10 arranged axially one behind the other are defined in the heat exchanger 1; that is, the first chamber 8 is located at the upper end 3 and the upper tube Between the plates 6 , a second chamber 9 is located between the tube sheets 6 , 7 of the tube bundle 5 , and a third chamber 10 is located between the lower tube sheet 7 and the lower end 4 of the casing 2 . ...
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The present invention relates to a method for increasing the capacity of a first tube bundle heat exchanger of the descending film type: by arranging in series to said first heat exchanger (1) at least a second tube bundle (25) heat exchanger (21) with vertical tubes (25a) and of the descending film type, equipped with a distribution chamber (28) for a liquid to be fed to the respective tube bundle (25) and by freely feeding by force of gravity said distribution chamber (28) with the liquid coming out of said first heat exchanger (1).
Description
technical field [0001] The present invention generally relates to tube bundle heat exchangers having vertical tubes and for exchanging heat between two fluids using the so-called falling film technique. [0002] According to the falling film technique, one of said fluids falls along the inner wall of the tube in a manner that does not fill the tube, forming a thin film that is in the central part of the tube itself and leaves a considerable empty space for the entire length of the tube; Another fluid circulates in an exchanger which is in contact with the outer wall of each individual tube in the tube bundle under consideration. [0003] The invention relates in particular to a method for increasing the heat exchange surface, and thus the potential, of a tube bundle heat exchanger of the type described above. Background technique [0004] It is well known that the above-mentioned technique using falling film heat exchange is widely and advantageously used in the chemical in...
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IPC IPC(8): F28D3/02F28D3/04
CPCF28D3/02F28D3/04
Inventor 费代里科·扎尔迪保罗·斯蒂基
Owner UREA CASALE SA