Abstract: This invention relates to a furnace equipped with a fuel optimizer for more effectively controlling fuel consumption in the furnace and a method for using the furnace fuel optimizer. In particular, the invention relates to a furnace fuel optimizer which controls combustion air by maximizing radiant section heat transfer with respect to convective section heat transfer while monitoring CO emissions in the flue gas and monitoring the draft below the convective section in order to obtain an optimum control value. The furnace fuel optimizer then regulates the furnace to correspond to the optimum control value by adjusting the air input to the furnace so that continuous furnace operation is possible at maximum efficiency.

Abstract: This invention relates to an internal measuring instrument for directly measuring wall thickness and for detecting flaws within the wall of a tube. This instrument comprises a rotatable disc support adapted to be moved through a length of tubing the disc having at least three holes spaced equal distance apart about its circumference, at least one laterally movable search unit compressively positioned in one of the holes, laterally movable contact shoes compressively positioned in the remaining holes, a rotatable handle having a visible indication mark corresponding to the position of the search unit, a conduit connecting the disc support to the handle, and an indicating device electrically connected to the search unit for directly presenting the internal characteristics of the tubing.

Abstract: This invention relates to an improved furnace fuel optimizer for more effectively controlling fuel consumption in a furnace and a method for using the furnace fuel optimizer. In particular, the invention relates to a furnace fuel optimizer which controls combustion air by maintaining a convective section differential pressure value or a convective section heat duty value while monitoring CO emissions in the flue gas and monitoring the draft below the convective section in order to obtain an optimum control value. The furnace fuel optimizer then regulates the furnace to correspond to the optimum control value by adjusting the air input to the furnace so that continuous furnace operation is possible at maximum efficiency.

Abstract: A process for the removal of oxidizable sulfur compounds from a waste gas which comprises:(a) mixing a waste gas containing compounds oxidizable to sulfur oxides with molecular oxygen and oxidizing said compounds to sulfur oxides;(b) contacting the oxidized gas with a metal oxide absorbent capable of absorbing sulfur oxides at a temperature of between about 100.degree. C. and 800.degree. C., and absorbing sulfur oxides with said metal oxide absorbent;(c) simultaneously, in the presence of a hydrocarbon cracking catalyst and at a temperature of between about 375.degree. C. and about 1,200.degree. C., cracking a hydrocarbon, regenerating the spent metal oxide absorbent and contacting the absorbent with steam to form hydrogen sulfide which can be separated from the cracked hydrocarbon and recovered as elemental sulfur.