Plug-type coke oven door

Claim 1

In a plug-type coke oven door which includes an outer door element and an inner plug element, said plug having (i) a front wall and (ii) left and (iii) right side walls connected to said outer door element, the interior region defined by the three walls having a duct therein permitting the passage of gases to the top portion of the plug, the improvement for significantly decreasing carbon accumulation within said duct and on the exterior surfaces of the left and right side walls, in which (a) essentially the entire cross-sectional thickness of said three walls is less than three inches, and are sufficiently thin to provide a thermal conductivity of at least 0.3 Btu/(hour) (sq.ft.) (°F/ft.) and (b) the left and right side walls have a width of at least 8 inches, said width being more than one half the depth of the plug, the interior of said duct being substantially unobstructed, in order that heat entering therein, primarily through the exterior face of said front wall, may readily be transferred to the interior faces of said left and right side walls and, in turn, to the outer faces thereof.