Heat exchange – Expansion and contraction relieving or absorbing means – Relieving or absorbing means supports temperature modifier...
Patent
1991-11-22
1993-02-09
Rivell, John
Heat exchange
Expansion and contraction relieving or absorbing means
Relieving or absorbing means supports temperature modifier...
165920, 34176, F28F 700, F26B 1712
Patent
active
051846705
DESCRIPTION:
BRIEF SUMMARY
THIS INVENTION relates to a heat exchanger and in particular a heat exchanger which can be used to treat particulate material for the purpose of calcining, drying, reactivation, effecting endothermic and exothermic reactions and like heat treatments.
In one form the invention resides in a heat exchanger for heating fluid particulate material comprising a heating chamber, heating means associated with the heating chamber, a receptacle mounted above the heating chamber, a delivery chamber located below the heating chamber, a set of flow passageways extending through the heating chamber between the hopper and the delivery chamber said delivery chamber having an outlet at its lower portion wherein the delivery chamber is provided with at least one restricted passageway opening into the heating chamber for the relief of gaseous pressure developed in the delivery chamber.
According to a preferred feature of the invention the passageway is adapted to increase the degree of opening between the delivery chamber and heating chamber with an increase in temperature.
According to a preferred feature of the invention said delivery chamber and heating chamber are separated by a wall and said passageway is formed by a hope through said wall.
According to a preferred feature of the previous feature said hole is located substantially centrally.
According to a preferred feature of each of the previous two features the aperture is associated with a plurality of kerfs extending radially from said aperture
The invention will be more fully understood in the light of the following description of one specific embodiment. The description is made with reference to the accompanying drawings of which;
FIG. 1 is a part sectional elevation of a heat exchanger according to the embodiment;
FIG. 2 is a schematic plan view of the wall of the heat exchanger separating the heating chamber from the delivery chamber; and
FIGS. 3a, b and c are schematic partial sectional elevations of the wall separating the heating chamber from the delivery chamber illustrating the portion of the wall incorporating that passageway at various stages of deformation.
The embodiment is directed to a heat exchanger for the heating of particulate material for the drying and/or reactivation of such particulate material. The general form of the heat exchanger to which the embodiment relates is the subject of Australian Patent No. 574012.
It has been found in the past in using the heat exchanger described above in the drying of carbon pulp for the purpose of drying and/or reactivation of the pulp that where particulate material carries with it organic contaminant materials that a significant back pressure can be developed in the delivery chamber as a result of the pyrolysis of such organic contaminants on passage of the particulate material through the heat exchanger. It is an object of this embodiment to provide a means of venting such gaseous pressure and disposing of the gases to reduce the possibility of the escape of noxious gases into the atmosphere.
The embodiment comprises a heat exchanger having a substantially cylindrical closed heating chamber 11 accommodating a burner (not shown) nozzle which is supported from a port 13 located at the lower portion of the heating chamber and which is directed substantially tangentially into the heat exchanger. The side walls of the heat exchanger are clad by insulating material 12. A flue pipe 15 is provided at the upper end of the heating chamber for the exhaustion of the combustion products. The upper end of the heating chamber 11 is associated with a receptacle which comprises a hopper 14 while the lower end of the heating chamber is associated with a delivery chamber 17.
The hopper 14 is supported to be above the upper wall of the heating chamber such that a space exists between the two. The hopper itself is provided with a plurality of air circulation tubes 20 which extend upwardly from the lower wall to above the expected level of material in the hopper. In use an air flow of heated air will be generated in the air cir
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Leo L. R.
Rivell John
Seaford Nominees Pty. Ltd.
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