Abstract: A burner for heating a gas stream is disclosed having a primary combustor mounted coaxially within a main combustor to form an assembly. The assembly is coaxially mounted within a burner housing and defines a gas flow space between the assembly and the housing. Gas enters the housing upstream of a substantial portion of the assembly and flows axially over the exterior thereof, picking up heat rejected from the assembly as it travels axially through the housing to an outlet area of a reduced diameter which defines a mixing zone. In the mixing zone, burner output and excess air are introduced to the gas stream in a manner so that the inputs are injected into the exhaust stream in a direction which has a normal component to the direction of gas flow thereby assuring adequate mixing and a resultant even distribution of heat in the flow.

Abstract: An exhaust gas burner reactor which comprises a burner apparatus having a combustor tube which extends axially in a spaced relationship to an exhaust gas conduit. The combustor tube has a first, base end having fuel and air inlets and a mixing chamber therein, and a second combustor end having a combustor chamber and outlets for ejecting burning fuel and air into the exhaust gas conduit. The combustor assembly is oriented so as to locate the burner outlets upstream of the first end so that heated exhaust gas/burner output mixture passes through an exhaust reactor defined between the combustor tube and the exhaust gas conduit. The reactor aids in the combustion of unreacted fuel components in the exhaust gas.

Abstract: A control system for an internal combustion exhaust gas heater provides air and fuel to the heater in appropriate proportion to be rapidly ignited therein upon activation of the control system. When flame is present in the heater, the proportion of air and fuel is adjusted to provide maximum heat energy from the heater to the exhaust gas for a predetermined period of time.

Abstract: A particulate trap for use in the exhaust system of a diesel engine to effect removal of particulates from the exhaust gases discharged from the engine, has a trap housing with an exhaust inlet at one end and an exhaust outlet at its opposite end with at least one ceramic monolith wall flow particulate filter having an inlet end and an outlet end positioned in the trap housing by a tubular support member having a mat of refractory material sandwiched between it and a portion of said particulate filter next adjacent to the outlet end thereof in a manner to prevent bypass flow from said exhaust inlet around said particulate to the exhaust outlet, at least 50% of the exterior surface of the particulate filter next adjacent to its inlet end being in spaced apart relationship to the trap housing so as to define a passage in flow communication with the incoming exhaust gases whereby these gases will heat the exterior of the filter next adjacent to the inlet end thereof so as to effect a reduction of the thermal str