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Method and apparatus for recovering heat energy from polluted water
| Details |
Inventors: Litzberg, Lennart;
Assignee: Sical AB (Stockholm, SE)
Primary Examiner: Ford; John
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman
A heat exchanger is provided in the form of cylindrical, hollow panels in upstanding, spaced, concentric relationship for a first medium flow, and a casing surrounding the panels for a second medium flow. The upper edges of the panels are mutually level. The heat exchanger also includes a carrying arm rotatable in the horizontal plane above the upper edges of the panels and carrying vertical cleaning arms extending between the panels. The second medium flow is downwardly taken into the casing under the inmost panel, and is taken out downwards from the casing outside the outmost panel the liquid surface of the second medium flow is allowed to rise to a level between the upper edges of the panels and the lower part of the carrying arm. A substantially constant gas volume is maintained in the casing above the liquid surface of the second medium flow, by arranging a control for sensing the liquid level (25) of the second medium flow. A gas pump (25) is arranged to maintain the gas volume in the casing above the liquid level substantially constant in response to the control. |
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DETAILED DESCRIPTION In the figures, the numerals 1, 2, 3 and 4 denote the concentrically arranged, hollow, cylindrical panels standing side by side.
The panels can be conventionally fabricated from helically extending pipes or two mutually joined pipes.
A first fluid flows into the outmost panel 1 and flows from it via pipe bends 5 to the panel 2.
From panel 2 the medium flows via pipe bends 6 to panel 3, and from panel 3, the medium flows via pipe bends 7 to the central panel 4.
The first fluid leaves panel 4 via an outlet 8.
As will be seen from FIG.
2, the first fluid flows connected in parallel from the outside and inwards towards the centre of the heat exchanger.
The heat exchanger in accordance with the invention further comprises a casing 9, upwardly and downwardly closed, and downwardly having a collection chamber 10 bounded by an intermediate wall 11.
This wall carries the cylindrical panels 1-4 and is provided with inlet openings 12, which lead to the interior of the central panel 4.
A line 13 for polluted or sea/lake water is connected to to the lower end wall of the casing 9.
An outlet line 14 is connected to the shell of the casing for this water, and it must be connected below the level 20 of the liquid, as will be described later, and, in the example illustrated, the connection is just above the intermediate wall 11.
The upper end edges of the panels 1-4 are mutually level, and above them is arranged a carrying arm 15 mounted on a shaft 16.
The shaft is suitably mounted at its bottom end on the intermediate wall 11, and sealingly mounted upwardly at the upper end wall of the casing 9 in a way not more closely illustrated.
The shaft 16 is driven by an electric motor 17.
The carrying arm 15 carries vertically extending cleaning arms 18, situated between the panels 1-4.
The cleaning arms are suitably provided with brushes (indicated at 18a) for cleaning the surfaces of the panels 1-4 when the carrying arm is rotated by the motor 17.
The polluted or sea/lake water, which comes up through the inlet openings 12, flows from the space within the central panel 4 and outwards through elongate openings 19 in the panels (see FIG
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