Combustion – Fuel disperser installed in furnace – Disperser cooled by fluid additional to furnace feed
Patent
1999-06-01
2000-09-12
Dority, Carroll
Combustion
Fuel disperser installed in furnace
Disperser cooled by fluid additional to furnace feed
431186, 431189, 2391323, 2395871, F23D 1136
Patent
active
061168939
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to burner assemblies and in particular, but not exclusively, to burner assemblies used in the heat treatment of products.
It is known to heat treat products by application of a flame, typically produced by burning a gaseous fuel and contacting the resulting flame with the product to be treated. An example is shown in GB 1534798 (Flynn) in which volatile products are removed from a moving web by passing the web beneath a burner producing a flame sheet extending across the width of the web. There many other heat treatments using burner flames and this is only one example.
When flame-treating products it is important to control the position of the burner with respect to the product being treated in order to ensure that the so-called "active zone" of the flame impinges correctly on the product. It is thus necessary for the position of the burner to be adjustable relative to the product in order to allow for correct positioning of the flame.
Known burner assemblies are in the form of a burner housing having one or more ports through which a gas/air mixture is burned to form one or more flames. The position of the burner assembly relative to the product to be treated is adjusted by moving the burner housing and securing it in the correct position.
However, problems can arise when, for example, wide moving webs of material are being treated. It is not uncommon for such moving webs to be several meters wide, sometimes in excess of six meters wide. The treatment of such webs is carried out by means of burner assemblies of approximately the same length as the width of the web, which are relatively heavy and difficult to manoeuvre. It is thus often difficult to adjust the separation of the burner assembly from the web with the necessary degree of accuracy (typically to an accuracy of 1 mm) and difficult to obtain a constant spacing across the whole width of the web to ensure uniform treatment.
It is an object of the present invention to overcome or alleviate the disadvantages associated with the prior art.
In accordance with the present invention, a burner assembly comprises a burner housing to which a combustible fuel is supplied and a burner port for discharge of combustion products from the burner assembly, characterised in that the position of the burner port is adjustable with respect to the burner body.
By having a burner port movably mounted in the burner housing, it is possible to fix the burner housing in position and to adjust the position of the burner port body within the housing more accurately since a much smaller mass than the burner assembly as a whole is moved, in contrast to the prior art where the position of the entire burner assembly is adjusted.
Preferably, the assembly comprises a burner port body in which the burner port (or a plurality of ports) is provided and the burner port body is movable with respect to the housing. The burner port body may be located in a recess or aperture in the burner housing. The burner port body may be slidably disposed in the recess or aperture.
The recess or aperture in the burner housing may comprise two opposed, substantially parallel walls and the burner port body may have two substantially parallel outer wall surfaces, each of which is in sliding engagement with a respective one of the two opposed walls of the recess or aperture.
The burner port body may comprise two substantially parallel walls and the port may be located between the walls.
There may also be means for adjusting the position of the burner port with respect to the housing. This may comprise one or more adjusting rods screw-threadedly engaged with one of the burner housing and burner port and/or rotatably mounted to one of the burner housing and burner port, whereby rotation of the or each adjusting rod causes relative displacement of the burner housing and the burner port.
There may be one or more cooling chambers (preferably in the vicinity of the burner port) for receipt of cooling fluid.
Preferably the burner housing and the burner port are elongate. It is also
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patent: 2647569 (1953-08-01), Flynn
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patent: 4362907 (1982-12-01), Polacsek
patent: 4781576 (1988-11-01), Dewitz
patent: 5292244 (1994-03-01), Xiong
PCT WO 97/09859, Mar. 1997.
PCT WO 97/09858, Mar. 1997.
European Patent Application 0411 786 A1, Feb. 1991.
UK Patent Application 2 281 836, Mar. 1995.
PCT WO 97/09861, Mar. 1997.
Dority Carroll
The Aerogen Company Limited
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