Abstract A liquid-fired burner in which the combustion space is defined by a cylinder which includes a screen heated by radiation from the combustion flame and by convection from the combustion gases flowing through the screen. The screen loses heat to the ambient volume principally by radiation and maintains an equilibrium temperature equal to or lower than the gases within the combustion space. Complete combustion with minimum excess air and low pressure drop is thus achieved resulting in operation at high thermal efficiency with minimal pollutant production. The radiant screen is so woven that very few optical paths exist from the interior combustion space to the ambient volume. Substantially all radiant energy originating in the combustion flames is intercepted by the screen, and the woven pattern serves also to enhance the transfer of heat to the screen from combustion gases passing therethrough. The screen may be made of an oxidationresistant alloy or may in some instances be coated with high temperature ceramic.
In a heating system as defined in claim 1, the combination wherein said screen is coated with high-temperature ceramic.
Claim 2
Dependent Claim
33 words
In a heating system as defined in claim 1, the combination wherein said end plates are of castable ceramic material, said material being cast with said screen to form an integral connection therewith.
Claim 3
Dependent Claim
17 words
In a heating system as defined in claim 2, the combination wherein said high-temperature ceramic is alumina.
Claim 4
Dependent Claim
20 words
In a heating system as defined in claim 1, the combination wherein said end plates are formed of castable firebrick.
Claim 5
Dependent Claim
25 words
In a heating system as defined in claim 1, the combination wherein said screen is one of the group comprising Inconel, Nichrome and silicon carbide.
Claim 6
Dependent Claim
92 words
A combination combustion chamber and radiant heat exchanger comprising an enclosure for reCeiving a combustible mixture and means for admitting said combustible mixture to said enclosure, said enclosure comprising: a. an insulating portion at least immediately adjacent said admitting means; and b. a porous screen defining the bounds of said enclosure and woven in a pattern substantially eliminating direct optical paths from within said enclosure to the exterior thereof for containing substantially all combustion internal of said enclosure, whereby substantially all radiant energy produced by such combustion is intercepted by said screen.
Claim 7
Dependent Claim
21 words
A combustion chamber and radiant heat exchanger according to claim 7 wherein said screen is coated with a high temperature ceramic.
Claim 8
Dependent Claim
18 words
A combustion chamber and radiant heat exchanger according to claim 8 wherein said high temperature ceramic is alumina.
Claim 9
Dependent Claim
28 words
A combustion chamber and radiant heat exchanger according to claim 7 wherein said insulating portion comprises insulating material cast with said screen to form an integral connection therewith.