Furnaces – Refuse incinerator – Refuse suspended in or supported by a fluid medium
Patent
1992-01-16
1993-09-21
Yuen, Henry C.
Furnaces
Refuse incinerator
Refuse suspended in or supported by a fluid medium
110346, 110347, 432222, 431170, F23D 1902
Patent
active
052459349
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to heating matter and is particularly, but not exclusively, applicable to methods of heating matter using apparatus as disclosed in Specification EP-B-68853 and copending British Specifications Nos. 2202618A, 2203670A, 2205049A and 2211597A, and in which matter is moved in a band continuously along an annular path in an annular zone by directing fluid flow into the zone over the annular extent thereof with both circumferential and vertical flow components. It will be understood that by utilising heated fluid for the fluid flow over at least a portion of the annular extent of the zone, there will be a heat transfer between the heated fluid and matter as the heated fluid passes through the band thereby heating the matter.
A gaseous mixture which is reactable to produce heat may be used to provide a heated fluid flow, for example the gaseous mixture may be a combustible gaseous mixture, typically comprising an air-gaseous fuel mixture.
However it will be understood that, for the above process of producing a heated fluid flow to be efficient in a method of heating matter as described above wherein the heated fluid flow passes through a band of the matter which is moving continuously along an annular path in an annular zone, the reaction which produces the heated fluid flow should occur in the zone and must be rapid to ensure that the reaction is substantially completed within the extent of the band, which for example is typically 50 mm deep.
SUMMARY OF THE INVENTION
We have found that the required rapid reaction can be achieved by supplying the gaseous mixture at a temperature above that at which fuel dissociation occurs, such that spontaneous ignition occurs and no flame front exists.
The invention in its broadest aspect includes a method of heating matter comprising supplying a gaseous mixture, which is reactable to produce heat, at a temperature above that at which spontaneous ignition occurs, to a heating zone such that the gaseous mixture reacts in said heating zone to provide a heated fluid flow therein, and supplying matter to be heated to said heating zone.
Advantageously the reaction utilised is a combustion reaction and the invention also includes a method of heating matter comprising supplying a combustible gaseous mixture at a temperature above that at which spontaneous ignition occurs to a heating zone such that a combustion reaction occurs in said heating zone to provide a heated fluid flow therein and supplying matter to be heated to said heating zone.
Furthermore, in presently preferred embodiments a combustible air-gaseous fuel mixture is utilised and the invention further includes a method of heating matter comprising supplying a combustible air-gaseous fuel mixture at a temperature above that at which spontaneous ignition of the gaseous fuel occurs to a heating zone such that a combustion reaction occurs in said heating zone to provide a heated fluid flow therein, and supplying said matter to said heating zone.
Although the invention is applicable to other methods of heating matter, it is especially applicable to the above-described method, in which case the matter to be heated is moved in a band continuously along an annular path in an annular zone by directing fluid flow into said zone over the annular extent thereof with both circumferential and vertical flow components, said fluid flow comprising said gaseous mixture over at least a portion of the annular extent of said zone, and the reaction thereof being substantially completed within the extent of said band.
The fluid flow may comprise said gaseous mixture over the annular extent of said zone.
The matter may comprise particulate material which forms a resident bed moving in said band along said annular path.
The gaseous mixture may be directed into a first annular region of said annular zone, which region is contiguous with and disposed inwardly of a second annular region of said annular zone such that said reaction occurs substantially in said first annular region, and said matte
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Mortimer Technology Holdings Ltd.
Yuen Henry C.
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