Heat exchange – Flow passages for two confined fluids
Patent
1993-06-10
1996-07-30
Leo, Leonard R.
Heat exchange
Flow passages for two confined fluids
165905, 165907, 4352841, 4352851, 4353091, F28D 700, C12M 300
Patent
active
055402771
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for improving heat and mass transfers towards and/or through a wall and, if appropriate, to such a method intended to be used with a permeable wall. The present invention also relates to a pair consisting of a wall and of a conducting material having improved heat and mass transfer characteristics.
Certain chemical or physicochemical techniques require the transit of a gas towards a wall separating the operating space into two regions, in which wall the temperature must additionally be controlled, by introduction or extraction of heat, in order to make it possible or easy to use these techniques which could, for example, involve passing the said gas from one region to the other through the wall. The wall can thus define an open or closed region constituting a medium containing one or a number of gaseous, liquid or solid materials, the said medium being stationary or non-stationary.
Thus, the problem is posed of maintaining the temperature of the wall, for example by heating, constant over all its useful surface while providing free passage of the gas towards the wall.
There are also problems with heat exchangers in which the exchange is carried out via an impermeable conducting wall which separates two fluids, one at least of which is in the gaseous state. In effect, in this type of exchanger, the heat transfer coefficient between the gaseous fluid and the wall, and consequently the other fluid, is very low.
In current methods or devices, it is possible either to improve the heat transfer towards a wall by depositing, on the latter, a good thermally conducting material which has the associated disadvantage of preventing the free circulation of the gas in the vicinity of the wall, or of promoting the passage of the gas by freeing the wall of all obstacles, in which case the heat transfer is reduced and additionally very badly controlled.
SUMMARY OF THE INVENTION
The subject of the present invention is to overcome these disadvantages by proposing a method which makes it possible to provide both transit of the gas towards the wall and the heat transfer.
The subject of the present invention is a method for improving transfers of heat and of material in gaseous form, in the vicinity of a wall separating an operating space into two regions, characterised in that there is attached to the said wall, on at least one of its faces, a porous solid phase having a high thermal conductivity which carries the gaseous effluent, under the action of a flow, into contact with the wall and transmits, to the wall, the heat supplied by a thermal source.
The method of the invention applies as much to the processes involving a transfer of materials from one region to the other through the said wall, which will then have a certain permeability, as to the processes in which there will simply be a heat transfer between the two regions, the wall then being impermeable.
In an embodiment variant, the method is implemented in an operating space separated by a permeable wall into two regions, one of which is the site of a chemical or physicochemical reaction; at least one of the faces of the said wall, especially that which is on the side of the region containing the heat source, is attached to a conducting porous solid phase which will carry the gaseous effluent to the vicinity of the wall and will transmit the heat arising from the source. This method will make it possible to precisely control the temperature of the wall and thus to control both the temperature conditions of the chemical or physicochemical reaction and the amounts of gas to be transferred from one region to the other of the operating space.
Permeable wall is understood to mean a wall capable of allowing compounds in the gaseous phase to pass under certain conditions of temperature and pressure. This property, denoted by the name of permeability, is modified by a temperature variation and can, under certain conditions, become virtually zero.
There will be used, according to the precise applica
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Gourlia Jean-Paul
Jacubowiez Isidore
Leo Leonard R.
Societe Nationale Elf Aquitaine
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