Ceramic burner plate

Details Ceramic burner plate Ceramic burner plate

1982-09-28

1985-03-12

Scott, Samuel

Combustion

Porous, capillary, particulate or sievelike flame holder,...

431328, F23D 1312

Patent

active

045042187

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a ceramic burner plate adapted to provide increased heat radiation and improved gas combustion, wherein such ceramic fibers as alumina fibers and alumina-silica fibers, a lithium component and such components as nickel, manganese, cobalt, titanium, copper, iron, chromium and vanadium are added to fireclay to prepare a composite ceramic material, which is then shaped into a platelike form, said burner plate being designed so that its surface is effectively red-heated by the combustion of gas which jets through gas passages extending from the back to the surface of the plate.


BACKGROUND ART

Among the known radiation type burners are the metallic burner using a wire net adapted to be red-heated by the combustion of gas taking place over its surface, and the ceramic burner in the form of a ceramic plate formed with gas passages. In the case of the metallic burner, from the standpoint of the corrosion resistance of metals at high temperature, it is difficult to increase the combustion surface temperature to provide increased heat radiation. On the other hand, the ceramic burner plate, the material of which is highly resistant to heat, is capable of having its surface heated to a relatively high temperature, but if its surface is heated to 900.degree. C. or above, the back-surface temperature would also become high as to cause a backfire. Raising the burner plate surface temperature is also undesirable in that the thermal shock due to the ignition and flame-out of the burner increases so much as to cause cracking, the cracked portion, in turn, tending to cause backfire, which shortens the life of the plate. To remedy such drawbacks, attempts have heretofore been made to use ceramic cloth for the combustion surface or use porous ceramics as a plate material of low thermal conductivity for the burner portion. Another attempt has been to irregularly deform the combustion surface to obtain a burner plate having a larger surface area, but it has a drawback that the deformation of the combustion surface results in dark portions representing poor combustion of gas, increasing the CO/CO.sub.2 ratio of exhaust gases.


DISCLOSURE OF THE INVENTION

This invention provides a burner plate made of composite ceramics in the form of fireclay having added thereto such ceramic fibers as alumina fiber and alumina-silica fiber, a lithium component and such components as nickel, manganese, cobalt, titanium, copper, iron, chromium, and vanadium, said ceramics being shaped into a platelike form having on its surface an undulating pattern depicting continuous triangles, hexagons, rhombuses or the like, so as to increase heat radiation and minimize the CO content of exhaust gases.
Embodiments of the invention will now be described with reference to the drawings.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a plan view of a ceramic burner plate according to an embodiment of the invention;
FIG. 1B is a section view along the line A--A' of FIG. 1A and
FIGS. 2A, B, 3A, B, 4A, B, 5A, B, 6A, B and 7A, B are plan views and sections along the line A--A' showing ceramic burner plates according to other embodiments of the invention.


BEST MODE FOR CARRYING OUT THE INVENTION

A burner plate according to the invention has a thermal conductivity of as low as 0.1 Kcal/m.multidot.h.multidot..degree.C. or less, is capable of maintaining the surface temperature above 900.degree. C. without causing backfire, and provides increased heat radiation from its surface construction having triangular, hexagonal, rhombic or otherwise shaped projections. According to the invention, coarse powder of petalite, spondumene or the like containing lithium oxide, lithium carbonate or other lithium component is added to fireclay powder followed by the addition of powder of an oxide, carbonate or the like containing such components as nickel, manganese, cobalt, titanium, copper, iron, chromium and vanadium and the addition of ceramic fiber cut into 0.1 to 10 mm lengths, in an amount of 40 to 96 wt.% based on the total weig

REFERENCES:
patent: 3170504 (1965-02-01), Lanning
patent: 3251396 (1966-05-01), Nitsche
patent: 3291188 (1966-12-01), Partiot
patent: 3954387 (1976-05-01), Cooper

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