Heat exchange – Regenerator – Checker brick structure
Patent
1985-01-08
1986-04-29
Davis, Jr., Albert W.
Heat exchange
Regenerator
Checker brick structure
16510416, 165111, 165920, 34 57A, F28D 1300
Patent
active
045850518
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to a method of, and apparatus for, the exchange of heat between solids.
(2) Brief Description of the Prior Art
In many chemical processes, it is necessary to conserve the heat applied to (or generated by) the process to enable the processes to be effected efficiently and economically. To conserve the heat, it must be exchanged between the reacted products and the reactive components of the processes.
The most general method of exchanging the heat between solids is to mix the solids to enable the exchange to occur. This method has two major disadvantages. Firstly, when the exchange has occurred, the solids must be physically separated. Secondly, the temperature of the mixture is always less than the temperature of the hotter of the two solids. For example, if equal quantities of reacted product at 500.degree. C. are mixed with reactive components at 100.degree. C., the temperature of the mixture will be approximately 300.degree. C. (i.e. the mean of the two temperatures).
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method where the solids are not mixed and so are physically separated as the heat exchange is effected.
It is a preferred object to provide a method in which heat exchange takes place between two solid streams in continuous flow.
It is a further preferred object to provide a method where the solids, which are to be heated, reach a temperature higher than the exit temperature of the solids from which the heat is removed.
It is a still further preferred object to provide a method which enables the reactive components to flow through the heat exchanger to receive the heat from the reacted products, pass through a reactor and then be returned to the heat exchanger to heat the incoming reactive components in a substantially continuous flow.
It is a still further preferred object to provide an apparatus for the method which is designed to control the flow of the solids through the heat exchanger to ensure maximum transfer of heat between the solids.
Other preferred objects of the present invention will become apparent from the following description.
In one aspect the present invention resides in a method of exchanging heat between solids including the steps of: continuous flow in a first flow path; separated from the heated solids, in a substantially continuous flow, in a second flow path countercurrent or concurrent to the first flow path; and through a heat conductive barrier separating the solids.
In a second aspect the present invention resides in an apparatus for the exchange of heat between solids including: respective first and second flow paths, separated by a heat conducting barrier; through the zone; and pass through the zone, so arranged that: zones, heat is transferred to the solids in the second zone.
The heat exchanger may include an exchange chamber having a plurality of tubes which form one of the two zones (the tube side of the exchanger), the other (or second) zone being formed by the interstitial space in the chamber surrounding the tubes or by secondary tubes (the shell side of the exchanger).
The inlet to the first zone may be connected to a supply chamber of the heated solids in a fluidized or non-fluidized state and the outlet of the first zone connected to a collection chamber for those solids.
The inlet of the second zone may be connected to a solids feeding device and the outlet of the second zone may be connected to an overflow opening or a solids withdrawal device.
The flowing solids in both zones may be fluidized or in moving-bed flow.
Preferably, inserts are provided in the second zone (shell side) to maintain a substantially constant gas velocity in the second zone to compensate for expansion of gas in the vertical direction due to pressure and temperature changes. Preferably, baffles will be provided to break up bubbles in the gas fluidizing the solids to prevent mixing or circulation of the solids in the vertical direction. The gas flow rate in the shell
REFERENCES:
patent: 2581041 (1952-01-01), Ogorzaly et al.
patent: 3075580 (1963-01-01), Davis, Jr.
patent: 3299947 (1967-01-01), Boucraut et al.
patent: 3617038 (1971-11-01), Schmidt et al.
patent: 4021927 (1977-05-01), Idaszak
Chong Yat O.
Leung Leung S.
Davis Jr. Albert W.
University of Queensland
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