Heat exchange – Regenerator – Checker brick structure
Patent
1997-12-22
1999-06-15
Lazarus, Ira S.
Heat exchange
Regenerator
Checker brick structure
165 8, 165 10, F23L 1502
Patent
active
059112700
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a regenerative heat exchanger.
BACKGROUND OF THE INVENTION
Regenerative heat exchangers are SE 9302148-3 which discloses bars in the form of sliding shoes made of carbon or graphite. This is a material that does not get damaged rapidly by the corrosive environment that is present at the locations where the sliding shoes are situated, and that withstands the prevailing high temperatures. Moreover, the material also has excellent lubrication properties and deposits a friction reducing layer of carbon or graphite on the flanges against which the sliding shoes are sliding. This, however, at the same time involves abrasion of the sliding shoes with a rate that has proved difficult to foresee. For that reason it has been necessary to complement each sliding shoes with measuring devices, which measure the clearance between the sector plates and the flanges, and which make it possible to screw forward the stop bars or sliding shoes a certain distance from their mounting means in time before the sector plates start scraping against the flanges such that the intended clearance is restored.
It is a time consuming supervision and adjusting work that is required, and therefore it is important to reduce this work as much as possible. Such a measure is to reduce the contact pressure to reduce the abrasion. A contact force amounting to about 500 N at the sliding shoes is required, however, in order to have the sliding shoes and accordingly the sector plates to follow the flanges at the thermal deformation of the cylindrical part, which sometimes has proved to result in a comparatively rapid abrasion.
SUMMARY OF THE INVENTION
The object of the invention is to attain a solution of the problem with the rapid abrasion of the stop bars or sliding shoes.
This has according to the invention been achieved by the heat exchanger having the features specified in the apprehended claims.
A jet of for instance air and/or water steam is arranged to hit the edge flange just where it is moving in under the support means, so that particles adhering more or less strongly to the edge flange and which can cause abrasion to the support means are blown away, possibly in the same moment as the particles are sheared loose by the edge of the support means and accordingly are prevented from moving in under the support means. Also a further diametrically positioned medium jet is effective in case strongly adhering particles are crumbled to small particles under the support means and appear behind the support means where they are blown away and prevented from getting stuck to the edge of the support means.
Also further passages positioned around the periphery of the support means have the same or similar purposes and are easily arranged in the shape of axial shallow grooves in the periphery surface of the support means and/or in the inner surface of the socket, in which case the passages are formed when the support means is placed in position in the socket.
The passages also have a cooling function, and one or more passages may be arranged within the periphery of the support means for achieving an effective cooling of the surface of the support means that is in contact with the edge flange.
A further function consists in that the medium jets cause a reaction force that partially can relieve pressure of the support means against the edge flanges when the support means are positioned close to the edge flanges.
Also a reinforced air cushion effect may be obtained with at least one channel positioned within the periphery surface, and a curtain as tight as possible of axial media jets around the periphery surface forming a so called skirt around the air cushion. A passage may extend without interruptions around the entire the periphery of the support means, and is preferably connected to a fluid pressure source having a higher pressure than a fluid pressure source connected to the passage or passages positioned within the periphery surface.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be further explained
REFERENCES:
patent: 3010704 (1961-11-01), Egbert
patent: 4256171 (1981-03-01), Zeek
patent: 4705098 (1987-11-01), Gerber et al.
Atkinson Christopher
Lazarus Ira S.
Svenska Rotor Maskiner AB
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