Heat exchange – Flexible envelope or cover type
Patent
1998-04-03
1999-07-27
Leo, Leonard
Heat exchange
Flexible envelope or cover type
165115, 159 133, 159 286, F28F 700
Patent
active
059273836
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a heat exchanger comprising bags made of film material for transferring heat from the steam being condensated inside the bags to the liquid being evaporated on the outer surfaces of the bags, as well as feed channel arrays provided at the top end of the bags for distributing the steam and liquid on the heat transfer surfaces both inside and outside the bags.
The Finnish publication print 86,961 describes a heat exchanger composed of plastic film bags, said heat exchanger being designed for distilling sea water or for concentrating various solutions or suspensions. The bags provided with liquid and steam channel systems are bound together to form a package, where the liquid under treatment is conducted to evaporate on the outer surfaces of the bags, whereafter the evaporation steam is compressed in a compressor to higher pressure and temperature and is conducted to inside the bags to serve as heating steam, which in the heat transfer is condensated back into liquid.
The FI patent application 944,472, related to the present invention in a way stipulated under section 2, subsection 2 of the Patent Law, describes a construction comprising feed channel systems for liquid and steam, provided at the top end of the bags and suited to be used in a heat exchanger operating according to the principle described in the FI publication 86,961. According to said application, the channel systems are realized by means of interconnected elements, every second of which is located inside the bag end, and every second outside the bag, and where the fastening means are notches and grooves, wherebetween the film surfaces of the bags are locked. By means of the notches and grooves, the films are thus folded; the folds make the bags narrower in the transversal direction thereof, at the same time creating an expansion margin in order to prevent the bags from stretching or tearing due to the effect of the pressurized heating steam fed therein.
The FI patent application 953,182, which is likewise related to the present invention in a way stipulated under section 2, subsection 2 of the Patent Law, further describes a structural solution for the liquid and steam feed channels, wherein the bags, at the top ends whereof there are provided internal steam feed strips, are removably attached to a common channel frame containing both steam and liquid channels. Also in this case the folding of the bag film material is realized by means of notches or grooves provided in said strips.
In the prior art solutions described above, difficulties may occur when bending the film material to conform to the notches or grooves of the elements or strips forming the liquid or steam channels in order to fold the material in a desired fashion. It may easily happen that the plastic film arranged in between or around the elements or strips gives way by stretching, in which case the desired corrugation is not achieved.
The object of the present invention is to provide an alternative solution, as compared to the ones mentioned above, for connecting bags made of film material to the steam channels located at the top end of a heat exchanger, in which case we achieve a simple and compact structure, and said stretching problem of the films can be avoided. The heat exchanger according to the invention is characterized in that at the top end of each bag, inside the bag, there is fitted an essentially straight strip bordering the steam channels to which strip the bag is fastened, and that in connection with the fastening, the bag has been shaped for improving its inflatability by cutting the top edge of the bag to be concave, and by thereafter pulling it straight, so that the middle part of the bag is raised in relation to the sides, and by attaching the thus straightened edge to the internal strip provided in the bag.
According to the invention, the sides of the steam-channel-bordering strips provided inside the bags are essentially straight plane surfaces, i.e. clear of all possible notches and/or grooves used in the prior art solutions
REFERENCES:
patent: 2566929 (1951-09-01), Lopker
patent: 3371709 (1968-03-01), Rosenblad
patent: 4216820 (1980-08-01), Andrew
patent: 4893669 (1990-01-01), Kashiwada et al.
patent: 5340443 (1994-08-01), Heinio et al.
patent: 5512141 (1996-04-01), Koistinen et al.
Koistinen Peter
Ramm-Schmidt Leif
Tiainen Veli
Hadwaco Ltd Oy
Leo Leonard
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