Abstract: A single unit, shell and tube fume incinerator utilizes a baffle (34) structure proximate a combustion zone (24) to control the flow of combustion exhaust gas. The baffle (34) is located proximate the hot ends of a plurality of heat exchange tubes (20) to deflect the hot exhaust gases from the combustion zone (24) away from the ends of the tubes (20), and back to the outside of the tubes (20), thereby controlling the "time at temperature" for contaminants in the impure gas feed. Baffle (34) provides a slip fit around tubes (20) to permit thermal expansion thereof.

Abstract: A regenerative incinerator comprises a combustion chamber, a regenerator having a plurality of discrete segments each of which has a heat exchange material therein and a valve for sequentially directing contaminated gas, purge air and cleansed gas to and from discrete segments of said regenerator, selectively.

Abstract: A valve comprising a circular butterfly that is rotatable about an axis extending diametrically of a cylindrical valve housing. The butterfly has two axially spaced seal surfaces on the periphery thereof that, in conjunction with complementary axially spaced seats on the valve housing, control the flow of air to or from an annular plenum that surrounds the valve housing.