Abstract: The disclosure relates to an exhaust gas cooling device for an internal combustion engine, having a housing which can be connected to an exhaust gas line of the internal combustion engine and has an axis of symmetry and having a Venturi assembly coupled to the housing for introducing exhaust gas and ambient air and having an outlet line emitting an exhaust gas-ambient air mixture into the environment, wherein: the Venturi assembly has a Venturi channel which can be coupled fluidically to the exhaust gas line and an inlet opening delimited by the Venturi channel and the exhaust gas line for ambient air; the Venturi channel is used to conduct an exhaust gas-ambient air mixture and opens, with the inlet opening, into a mixing chamber; the Venturi channel has an outlet opening and the outlet opening has an inflow opening, wherein the outlet opening and the inflow opening are spaced apart from one another; the Venturi channel and the outlet line, with the inflow opening, open into the housing.

Abstract: A plate system is used in a surgical procedure to manage a distal radius or similar bone fracture. A plate of the plate system includes two leg segments extending downwardly from a generally horizontal segment, and further includes an elongated slot defined through the center of the horizontal segment of the plate near its top edge. A subchondral support element is inserted through the elongated slot and is advanced into the bone. The plate further defines two holes through the horizontal segment near a respective one of the two leg segments. Locking screws, such as variable angle locking screws, are inserted into and locked into the respective holes, with each locking screw advancing into the bone such that a distal tip of each locking screw engages the subchondral support element, thus providing a three-point support.

Abstract: An engine system includes an exhaust gas recirculation conduit having an inlet in fluid communication with an exhaust conduit and an outlet in fluid communication with an intake air conduit. An exhaust gas recirculation performance balancing restrictor has an uninstalled position wherein the exhaust conduit defines a first backpressure at the inlet of the exhaust gas recirculation conduit. The exhaust gas recirculation performance balancing restrictor also has an installed position in which the exhaust gas recirculation performance balancing restrictor is removably disposed within the exhaust conduit downstream from the inlet of the exhaust gas recirculation conduit. In the installed position, the exhaust gas recirculation performance balancing restrictor provides a fixed flow restriction through the exhaust conduit to generate a second backpressure at the inlet of the exhaust gas recirculation conduit that is greater than the first backpressure.

Abstract: An exhaust gas cooling apparatus and method for cooling an exhaust gas is provided. The exhaust cooling apparatus having a first fluid conduit having a variable nozzle opening disposed at one end of the first fluid conduit, the variable nozzle opening being defined by a shape memory alloy extending from the first fluid conduit; and a second fluid conduit having an inlet end and an outlet end, the variable nozzle opening being disposed in the second fluid conduit proximate to the inlet end of the second fluid conduit such that a fluid inlet opening is disposed about an outer periphery of the variable nozzle opening and an inner surface of the inlet end of the second fluid conduit, the shape memory alloy varying the size of the variable nozzle opening by moving toward or away from a center line of the first fluid conduit in response to a temperature of an exhaust gas flowing through the first fluid conduit.

Abstract: An exhaust filter system includes a particulate filter (PF) that is disposed downstream from an engine. The PF filters particulates within an exhaust from the engine. A heating element heats particulate matter in the PF. A fastener limits expansion movement of the heating element relative to the PF.

Abstract: An exhaust system associated with a power source is disclosed. The exhaust system may have an exhaust stack extending from the power source to an exterior of the exhaust system and a moisture collection device disposed within the exhaust stack to collect moisture from the exhaust stack. The exhaust system may also have a moisture entrainment device associated with the moisture collection device to facilitate entrainment of the collected moisture into an exhaust flow of the power source.

Abstract: An exhaust system includes a particulate filter (PF) that is disposed downstream from an engine. The PF filters particulates within an exhaust from the engine. A heating element heats particulate matter in the PF. A catalyst substrate or a flow converter is disposed upstream from said heating element. The catalyst substrate oxidizes the exhaust prior to reception by the heating element. The flow converter converts turbulent exhaust flow to laminar exhaust flow prior to reception by the heating element.

Abstract: A motor chain saw includes a housing with a housing wall, which has an opening for exhaust gases and a hood extending outside the housing through the opening, with a hood opening pointing to one side. Exhaust gases flowing from an interior of the housing in an exhaust jet (S) are guided to the outside through the opening. A fin is arranged on the opening and provides a silencer for exhaust gases directed towards a flow direction of the exhaust jet (S) escaping from the hood.

Abstract: The present invention provides an exhaust cooler mounted to a tailpipe for receiving exhaust gas. The exhaust cooler includes a jet pump connectable to the tailpipe and a nozzle connectable to the tailpipe. The nozzle defines a nozzle opening between the tailpipe and the jet pump for communicating the exhaust gas from the tailpipe to the jet pump. A first member is included that is moveable between a closed position and an open position, the open position defining a first opening between the tailpipe and the jet pump for communicating the exhaust gas from the tailpipe to the jet pump.

Abstract: A device for cooling a gas is provided. The device comprises an inlet having a first diameter, a mixing section downstream of the inlet and having a second diameter, and an opening in fluid communication with the mixing section and a source of air. The device is such that the second diameter is smaller than the first diameter and a vacuum is created for drawing in the air from the opening as gas passes from the inlet to the mixing section so that the air drawn into the mixing section mixes with the gas. A method for mixing two gases and an exhaust system are also provided.

Abstract: In order to make available an exhaust gas system for a combustion engine with an external housing, which contains at least one rear shell and one front shell, and with a catalyst chamber, in which at least one catalyst element is arranged, and with an exhaust gas duct, from which exhaust gas is conveyed from the catalyst chamber, said exhaust gas system including few components and being able to be produced cost-effectively and wherein harmful thermal stresses in the components of the exhaust gas system are largely avoided, the catalyst chamber also forms the exhaust gas duct. The catalyst chamber has at least two chamber halves, and the exhaust gas duct is provided materially uniform and in one piece in at least one chamber half.

Abstract: An exhaust device includes an exhaust pipe connected at its upstream end to a cylinder head of the engine and an exhaust muffler connected to the downstream end of the exhaust pipe for suppressing the generation of noise from a heat insulating cover that covers a part of the exhaust pipe. A heat insulating cover covers a portion of the exhaust pipe near the engine and a stay is fixed to the heat insulating cover. The stay includes a supporting plate portion curved so as to partially surround the outer circumference of the exhaust pipe. A first vibration isolating member is provided that is sandwiched between the outer circumference of the exhaust pipe and the supporting plate portion, a band member is tightened to mount the supporting plate portion to the exhaust pipe, and a second vibration isolating member is sandwiched between the supporting plate portion and the band member.

Abstract: In an exhaust emission control system for an engine, comprising an exhaust emission control catalyst disposed in an exhaust muffler whose inside is divided into a plurality of chambers, at least a portion of the inside of the exhaust muffler is divided into a first chamber for converting mainly NOx in exhaust gas and a second chamber for converting HC and CO in the exhaust gas. The exhaust muffler comprises: a partition wall having a conduit for guiding the exhaust gas from the first chamber to the second chamber; an exhaust gas inlet for introducing the exhaust gas into the first chamber; an external-air suction means for sucking external air into the second chamber; and a discharge pipe for discharging the external air and the exhaust gas flowing through the second chamber.

Abstract: A induction exhaust system, for an internal combustion engine, capable of the multi step processes of 1) scavenging the chamber of exhaust gases and free radicals, 2) breaking the scavenge vacuum wave behind each energetic exhaust pulse, releasing said free radicals and the overscavenged air fuel vacuumed from the intake manifold during valve overlap, and 3) induction of such free radicals, unburned fuel, and fresh matter including atmospheric air.

Abstract: A reciprocating piston engine (2) includes an exhaust system comprising an exhaust pipe (8) which communicates with a silencer (10), whose upstream portion (11) is divergent in the direction of gas flow through it, an oxidising catalyst (12) and an air supply pipe (14) communicating with the exhaust pipe at a position upstream of the catalyst and silencer. The air supply pipe (14) includes a Reed valve (16) which is adapted to open under a pressure differential to permit air to flow into the exhaust pipe. In order to maximise the air flow into the exhaust pipe the effect of pressure pulses within the exhaust pipe is utilised and for this purpose 3L2−(2L1+L2) is equal to ±0.25 to 0.

Abstract: In an exhaust emission control system for an engine, comprising an exhaust emission control catalyst disposed in an exhaust muffler whose inside is divided into a plurality of chambers, at least a portion of the inside of the exhaust muffler is divided into a first chamber for converting mainly NOx in exhaust gas and a second chamber for converting HC and CO in the exhaust gas. The exhaust muffler comprises: a partition wall having a conduit for guiding the exhaust gas from the first chamber to the second chamber; an exhaust gas inlet for introducing the exhaust gas into the first chamber; an external-air suction means for sucking external air into the second chamber; and a discharge pipe for discharging the external air and the exhaust gas flowing through the second chamber.

Abstract: A induction exhaust system, for an internal combustion engine, capable of the multi step processes of 1) scavenging the chamber of exhaust gases and free radicals, 2) breaking the scavenge vacuum wave behind each energetic exhaust pulse, releasing said free radicals and the overscavenged air fuel vacuumed from the intake manifold during valve overlap, and 3) induction of such free radicals, unburned fuel, and fresh matter including atmospheric air.

Abstract: Device for controlling the mode of combustion of a controlled-ignition four-stroke petrol engine (1) equipped with a system (2) for the direct injection of fuel into the combustion chamber, with at least one catalytic converter (3) placed in the exhaust line (4) of the engine (1) and with a control system (5) receiving information from sensors (6, 7, 9, 10) relating to the rotational speed and to the load of the engine, to the position of the accelerator pedal, and to the temperatures of the engine and of the exhaust gases, characterized in that the control system (5) includes a device for choosing a priority mode of combustion taking account of the said information and on the basis of an estimate of the combustion efficiency of the various modes available.

Abstract: An exhaust manifold device is provided to allow air to enter an exhaust manifold during normal operation or an engine to prevent exhaust gases being sucked into the cylinders via exhaust valves. Air can be supplied, via valves (18 and 21) to the exhaust manifold as required and, is supplied to the valve (21) at pressures, above atmospheric pressure, that increase with engine speed. Synchronized electrical pulses are supplied to a solenoid (18A) to open the valve (18).

Abstract: An apparatus and a method for enhancing the rate of a chemical reaction in a gas stream. The apparatus includes at least one heterogeneous catalyst having an upstream end and a downstream end, and at least one surface having a plurality of catalytically active sites on the surface, where the catalyst is positioned so that at least a portion of the gas stream contacts at least a portion of the catalytically active sites on the surface. At least one device for producing radicals or other active species from at least one of water vapor or other gaseous species, such as a corona discharge device or a UV light source is used to produce radicals or other active species, which are introduced into the gas stream at a position upstream of the downstream end of the catalyst.

Abstract: An engine muffler is provided which comprises a first expansion chamber for exhaust gas which includes an exhaust gas inlet to be connected to an exhaust port of an engine, a second expansion chamber which includes an exhaust gas outlet, a first exhaust gas purifier in which a catalyst for purifying exhaust gas is coated on at least a concave surface of a concave base body which has a plurality of vent holes passing through the concave surface, the first exhaust gas purifier being disposed in the first expansion chamber such that the concave surface faces the exhaust gas inlet, and at least one second exhaust gas purifier in which a catalyst for purifying exhaust gas is coated on a base body including many pores, the second exhaust gas purifier being disposed between the first expansion chamber and the second expansion chamber. The engine muffler is obtained simply by improving a muffler used for a small-sized engine. The engine muffler has an extremely great effect of purifying exhaust gas.

Abstract: An emissions control system for rich-burn internal combustion engines, includes a reaction chamber for thermal oxidation of exhaust gas fuel values. A passive means utilizes exhaust flow energy for induction of air into engine exhaust gas, and a duct transfers the exhaust gas together with the inducted air into the reaction chamber for thermal oxidation. To achieve a high degree of efficiency the thermal oxidation is facilitated by through mixing of air and exhaust gas to insure gas phase thermal reaction.

Abstract: The invention discloses a device for filtering internal combustion engine exhaust gases, comprising an electrostatic filtering chamber equipped with electrostatic filtering means, a line for supplying gases into the chamber, in fluid communication with an inlet of the chamber, at one of the ends of the supply line, the other end of the supply line being provided with an opening having an inlet orifice adapted to allow the penetration of the exhaust gases and of a flow of ambient air for cooling the exhaust gases. In this device, the means for drawing the exhaust gases and the air flow are mounted downstream of an outlet of the chamber, to allow the mixture of air and gases to pass into the said chamber and reject the filtered gases into the environment and a filter for coarse solid particles and droplets derived from the mixture is mounted in the chamber, upstream of the electrostatic filtering means.

Abstract: An exhaust system for an internal combustion engine. A plenum chamber has two ports, one which is connected to a header tube for conducting a stream of exhaust gas and another which is connected to a ram tube adapted to collect outside air provided by movement of a vehicle in which the internal combustion engine is installed. The plenum chamber is constructed so that the outside air is caused to travel thereinside at least a substantially non-zero set-back distance before being permitted to join the stream of exhaust gas. Preferably, the exhaust system also includes one or more reverse flow controllers associated with respective cylinders of the internal combustion engine, downstream from the exhaust ports thereof.

Abstract: A muffler for an internal combustion engine has a vertically elongated expansion chamber into which an exhaust gas from the exhaust port of internal combustion engine is introduced. The expansion chamber is separated level-wise into a first expansion chamber and a second expansion chamber by a partition plate. An exhaust emission purifier formed of an oxidation catalyst is attached to the partition plate, thereby allowing the exhaust gas ejected from the exhaust port to be introduced into the second expansion chamber from the first expansion chamber via the exhaust emission purifier. The exhaust emission purifier is spaced apart from the exhaust port by a predetermined distance in a direction orthogonal to an ejecting direction of the exhaust gas.

Abstract: An apparatus and a method for enhancing the rate of a chemical reaction in a gas stream. The apparatus includes at least one heterogeneous catalyst having an upstream end and a downstream end, and at least one surface having a plurality of catalytically active sites on the surface, where the catalyst is positioned so that at least a portion of the gas stream contacts at least a portion of the catalytically active sites on the surface. At least one device for producing radicals or other active species from at least one of water vapor or other gaseous species, such as a corona discharge device or a UV light source is used to produce radicals or other active species, which are introduced into the gas stream at a position upstream of the downstream end of the catalyst.

Abstract: An exhaust apparatus for a combustion engine having a combustion chamber and an exhaust pipe for conveying exhaust gas in an exhaust stream from the combustion chamber is disclosed, wherein the exhaust apparatus includes a fan member disposed downstream of the combustion chamber and substantially sealingly associated with the exhaust pipe and an air inlet for introducing air relative to the fan member whereby the fan member is driven by the exhaust stream and air so as to create an area of low pressure between the fan member and the combustion chamber whereby extraction of exhaust gas from the combustion chamber is facilitated.

Abstract: An oxidation catalytic converter system for small spark ignited engines includes a housing containing a catalyst, an inlet for receiving exhaust gases from the engine, and an outlet for discharge of the exhaust gases from the housing after passing through the catalyst. Attached to the engine exhaust is a jet pipe that extends into the inlet in noncontacting relation to the housing, whereby the catalytic converter is vibrationally isolated from the jet pipe. Surrounding the jet pipe is an annular air gap through which ambient air is drawn into the housing and mixed with the exhaust gases for enhanced cooling and catalyst performance.

Abstract: An exhaust apparatus for an engine is provided, which is capable of efficiently sucking in secondary air for a catalyst by utilizing an ejector (entraining) effect caused by the exhaust gases and which has a simple and inexpensive structure. Exhaust gases from the engine are introduced into a main muffler body, are expanded and muffled by passage through a plurality of silencer chambers, and are also passed through a catalyst and scrubbed thereby in a state in which they are mixed with secondary air introduced from the exterior. A secondary air introduction pipe for introducing secondary air is provided in a first-stage silencer chamber. A mixing pipe is provided into which are introduced the secondary air introduced from the secondary air introduction pipe and the exhaust gases from the first-stage silencer chamber.

Abstract: A multi-pass catalytic converter/muffler uses a single catalytic support bed without increasing the overall size of the catalytic converter/muffler. The outer surface area of the catalytic support bed is disposed adjacent to the outer wall of the catalytic converter housing, with only the mat in between. Secondary air may be provided upstream before the exhaust gases make their first pass through the catalytic support bed, or after the first pass but before the second pass or even after the second pass.

Abstract: The present invention is a flow focusing and mixing device for use with internal combustion engines. The flow focusing and mixing device may be located in the exhaust stream of an internal combustion engine for increased oxidization of the exhaust, increasing the air quality of the exhaust released into the environment.

Abstract: The invention relates to a catalytic combustion engine exhaust gas purifier with additional air supply. The exhaust gas purifier comprises a housing structure (1) accommodating an exhaust gas inlet (2), at least one catalyst element (3), means (4) for laminarizing the exhaust gas flow, means (5 and 6) for dividing the housing structure (1) into several chambers (7-9), an exhaust gas outlet (10) and, additionally, means (11) for supplying additional air (17 and 18) into the exhaust gas flow (14 and 15) in the housing structure (1). One or more suction plates (19 and 20) are provided in the chamber (8) after the means (4) laminarizing the exhaust gas flow and at the same time in the vicinity of the means (11) supplying additional air.

Abstract: The catalytic muffler for small internal combustion engines has a venturi with a flattened profile formed from two stamped pieces, namely the muffler housing and the separator plate. This design eliminates the need for a separate piece of tubing or machined part, as is required in prior art round venturi devices. The catalytic muffler also includes a noise attenuator disposed upstream of the catalyst, thereby eliminating the back pressure which is otherwise applied to the venturi when the noise attenuator is disposed downstream of the catalyst. In addition, back pressure on the venturi is reduced by sizing the port in the separator plate and the exhaust port so that their respective cross sectional areas are substantially equal to the cross sectional area of the catalyst.

Abstract: An exhaust purification device includes a catalytic converter for purifying exhaust gas from an engine, air-fuel ratio sensors provided on the upstream side and downstream side of the catalytic converter, respectively, for detecting the concentration of a specific component in the exhaust gas, a control device for processing the output of the air-fuel ratio sensors and generating a signal based on the processed output, and a catalyst degradation warning device which operates according to the signal generated by the control device for warning an operator of a degraded catalyst, where the responsiveness of the downstream side air-fuel ratio sensor is lower than the responsiveness of the upstream side air-fuel ratio sensor.

Abstract: An exhaust afterburner for positioning in an exhaust duct or the like of an internal combustion engine through which partially reacted gases are circulated is disclosed. The exhaust afterburner includes a venturi induction member which has a circumferential array of radially extending apertures for inducting a reacting gas into the exhaust duct upon passage of the partially reacted gases therethrough. A housing surrounds a venturi induction member and includes a first air intake opening in communication with the apertures of the venturi induction member as well as a second air intake opening disposed adjacent to the inlet end of the venturi induction member. A bushing is positioned within the housing at the second air intake opening with the bushing having a circumferential array of radially extending apertures in fluid communication with the second air intake opening. A mechanism for relieving back pressure is provided within the exhaust afterburner positioned within the exhaust afterburner housing.

Abstract: A motor-driven air pump operates when an engine is starting so that warming-up of an exhaust gas purifying catalyst may be expedited. The air pump has a low ventilation resistance to pass secondary air therethrough even when the pump is not driven by the motor. A high-response, low pressure-loss check valve is disposed in a passage connecting the catalyst in the exhaust gas passage and the air pump. When the engine is decelerating, the pump is not driven. However, the secondary air is introduced to the catalyst through the high-response, low pressure-loss check valve from the pump under the negative pressure caused by pulsation of the exhaust gas pressure. Thus, a bad smell from the catalyst may be prevented without increasing the size of the air pump and the motor.

Abstract: An engine exhaust apparatus comprises a sound suppressing section for lowering the exhaust noise level as an exhaust gas discharged from the exhaust port passes through it. The exhaust apparatus is provided with an ejector section for introducing secondary air into the exhaust gas delivered from the sound suppressing section and mixing the gases, and a post-treatment section for purifying the gas mixture delivered from the ejector section. The exhaust gas discharged from an exhaust manifold gets into the ejector section through the sound suppressing section, and is then purified in the post-treatment section. Therefore, the ejector effect cannot be reduced by the sound suppressing section which is subject to high flow resistance. Thus, the exhaust noise level can be lowered with the ejector effect of the introduction of the secondary air improved considerably, and low cost and simple construction can be enjoyed.

Abstract: An emissions control system for rich-burn internal combustion engines, said control system comprising:a. a reaction chamber for oxidation of exhaust gas fuel values,b. passive means to utilize reaction chamber effluent flow energy to mix cooling air into reaction chamber effluent to lower the temperature of said effluent.c. flame arrestor means to prevent ignition of flammable fuel-air mixtures external to the engine.

Abstract: An engine exhaust gas cleaning system including a converter section that is disposed at the rear end of the exhaust pipe and which has an outer shell that is surrounded by a further outer shell having a rearwardly disposed atmospheric air inlet and a forwardly disposed atmospheric air outlet that communicates with the inlet of the converter through a venturi section. This heats the air admitted to the converter and also insures that any exhaust sound or exhaust leakage will be disposed rearwardly.

Abstract: The invention relates to a device for removing soot particles from exhaust gases of a diesel engine. To this end, the exhaust pipe (15) of the diesel engine (1) is connected to a vortex tube (2) into which the exhaust gases of the diesel engine flow tangentially. The exhaust gases expand adiabatically as they flow through a diaphragm (4) in the region of the exhaust gas inlet, and are cooled in the process. The exhaust gases swirl helically in the vortex tube (2), and the temperature is raised by approximately 100.degree. C.; that is, incoming gases at a temperature of approximately 500.degree. C. are heated to approximately 600.degree. C. This temperature is sufficient for combustion of the soot particles inside the tube. The exhaust gases leaving the hot end are therefore practically free from soot particles.

Abstract: A catalystic converter includes an annular catalyst bed containing catalyst beads and defined by inner and outer coaxial perforated tubes. An outer shell coaxial with the catalyst bed defines a passage between the outer shell and the outer perforated tube. The passage is connected to an outlet port. Exhaust gas flows radially outward through the catalyst bed and then through the passage to the outlet port. Air is injected into the passage at a selected axial location and is drawn into the catalyst bed by the reciprocating action of the engine. As a result, the single catalyst bed has an inner zone with a scarcity of oxygen which reduces oxides of nitrogen and an outer zone with oxygen present. Unburned hydrocarbons and carbon monoxide are oxidized in the outer zone.

Abstract: A catalytic booster-converter for insertion into the exhaust pipe of a vehicular exhaust system comprising an elongated conduit device adapted to be rigidly connected in series with an exhaust pipe intermediate the ends thereof. The elongated conduit device is in separate length portions which are spaced apart a predetermined distance. A catalytic converter element is interposed between and removably secured to the facing ends of said length portions. A converter element is secured between such length portions in such a manner that it can be removed and replaced by movement transversely of the conduit device.

Abstract: The invention relates to new and useful improvements in the design of fluid ejectors and in particular to their use in the exhaust and induction manifolds of the piston driven internal combustion engine. Accelerated exhaust gases jetting from an engine cylinder side-port are directed through an intervening air space toward a diffuser duct. Impact between the accelerated exhaust particles and air particles within the air space causes a resultant vector change of the momenta of the sum total of reacting particles in a manner which reverses the direction of air flow toward the diffuser. The inertial flow of the fresh air stream, drawn into the air space after the exhaust cycle is complete, is again directed toward the engine cylinder side-port nozzle to facilitate induction on the subsequent intake stroke of the piston.

Abstract: A combination muffler and catalytic converter for an exhaust system. The unit comprises an outer housing having an inlet to receive exhaust gases, and a venturi is located within the housing and provides an aspirating effect to draw air into the housing from the atmosphere for the catalytic conversion. The venturi includes a diverging conical outlet section, and the gases are discharged from the outlet section through a plurality of perforations which aids in obtaining a uniform distribution of the gases to the catalytic unit that is located centrally of the housing. After passing through the catalytic unit, the gases are discharged from the housing through a discharge pipe having a closed inner end and perforations in its wall through which the gases flow. The perforated discharge pipe provides a self-controlling system which prevents overheating of the catalyst.

Abstract: Combination muffler and catalytic converter utilizes an axial flow monolithic catalytic element to treat exhaust gases from an internal combustion engine and partially reduce their sound. The device incorporates a venturi in the exhaust gas inlet path to add secondary air. The efficiency of the venturi is quite high since backpressures introduced downstream of the venturi are kept low by providing an extremely long outlet cone for the venturi which reverses the flow direction while preventing wall separation and turbulence. Sound attenuation is provided upstream of the venturi where the backpressures produced have minimum effect in reducing venturi efficiency.

Abstract: A separator for removing sulfuric acid from a hot gas stream comprising a substantially cylindrical body having tangentially arranged inlet and outlet conduits to create a vortical flow path of the gas being treated, means being provided for adding cooling air to the gas, the inner surface of the body being provided with baffle means to cause a high degree of turbulence in the gases at the surface which is maintained at a temperature below that for condensation of sulfuric acid.