Abstract: Fine particles including volatile components and combustible non-volatile components are removed from exhaust gas by a method comprising providing at least two paths for the gas each with a filter capable of trapping the particles and conducting a process of trapping the particles and a process of burning the trapped particles separately and alternately in different filters with an apparatus including at least two fine particle trapping apparatus each constituted as a pipe-like structure having its one end connected with a pipe for untreated exhaust gas, its other end connected with a pipe for treated exhaust gas and a filter made of incombustible material and capable of trapping the particles disposed between the two ends, switchover valves for selectively opening and closing the two ends, and heaters for heating the filters to a prescribed temperature.

Abstract: An exhaust gas purifying apparatus comprising a first and a second casings having expansion chambers, respectively, a third casing arranged between the first and second casings to form a passage therebetween, an inlet pipe introducing the exhaust gas into the first expansion chamber, and an outlet pipe discharging the exhaust gas from the second expansion chamber, whereby a muffler is constituted. The apparatus also comprises a filter arranged in the third casing to trap particulates in the exhaust gas, and a heater arranged adjacent to the filter on the side of the second expansion chamber to burn the particulates deposited on the filter, to regenerate the filter. A flow control unit, comprising a bypass and a valve therein, is arranged such that the exhaust gas normally flows through the filter and the heater, and when the filter is regenerated, at least a part of the exhaust gas flows in reverse through the heater and the filter. This exhaust gas purifying apparatus is built-in to the muffler.

Abstract: Muffler-filter apparatus for reducing both sound and particulates from exhaust gases from an engine. The apparatus includes resonating chambers, flow distribution means and a cellular ceramic core filter module. Filter regeneration mechanism includes a heating element for heating the carbon on the inlet end of the ceramic core to combustion temperature. Particulate ignition resulting in regeneration occurs when combustion air is provided. In alternate embodiments, combustion air first flows through a preheater system. A processor unit with particular logic controls the apparatus. The particular method of regeneration depends on the application in which the muffler-filter is used.

Abstract: A system for the regeneration, by oxidation, of the particulates deposited in a particulate filter trap of an internal cumbustion engine provided for purifying the engine exhaust gas, in which the thickness of the particulates deposited in a given area in the trap is determined relative to a predetermined thickness in excess of which the filter trap will operate inefficiently, and the excess thickness being reduced by regeneration.

Abstract: A two stage filtration system for removing textile waste materials and the like from transport air. The first stage includes a preseparator having a cylindrical screen and an inlet at the interior portion of the cylindrical screen and an outlet on the outside portion of the screen, and the outlet portion is in open communication with a panel filter for further cleaning. Large waste particles are separted by the cylindrical screen and contained in a compartment therebeneath. A second stage filter is provided which includes a generally rectangular housing having a flat filter element extending diagonally thereacross, a small fan is provided for diverting a relatively small portion of the main air in the first stage to carry the collected waste particles from the first stage to the bottom face of the flat filter in the second stage.

Abstract: Air filtration systems and methods which intentionally use collected dust to enhance air filtration performance, use air flow rate control to optimally maintain electro-mechanical efficiency and media permeability, use high velocity discharge to "throw"clean air to preferable workplace areas, and use a cylindrical drum design for pleasing appearance and practical features. The systems and methods are particularly applicable as modular filtration units to textile processing environments, but are suitable for more general applications as well.

Abstract: A regenerable filter for use with exhaust gas streams containing combustible particles, the filter including a filter medium upon which the particles build up as the filter medium removes the particles from the gas stream, a scraper to remove the particles, except for a precoat, from the filter medium, and a burner to burn the removed particles outside the main exhaust gas exit.

Abstract: A method and apparatus for removal of fine particulate fly ash at high temperature and pressures using a bag filter which produces a clean gas stream that is recycled to compressors or power recovery turbines and a concentrated syngas stream blowdown from which additional solids are subsequently removed.

Abstract: Muffler apparatus for reducing both sound and particulates from exhaust gases from an engine. The apparatus includes resonating chambers, flow distribution structure and a cellular ceramic core filter module. Filter regeneration mechanism includes a heating element for heating the carbon on the inlet end of the ceramic core to combustion temperature. Particulate ignition resulting in regeneration occurs when combustion air is provided; in alternate embodiments, combustion air first flows through a preheater system. A processor unit with particular logic controls the apparatus.

Abstract: A filter system comprises a filter unit and a cleaning unit which cleans the filter unit while the filter unit is operating normally. The filter unit is compartmentalized. During cleaning, an individual compartment is isolated between a pair of ducts of the cleaning unit and is cleaned by applying pulses of a cleaning fluid to one of the ducts and suction to the other duct. The filter unit is rotatable relative to the cleaning unit to align successive compartments of the filter unit with the cleaning unit.

Abstract: A self-cleaning air filter includes a tubular housing and an annular filter cartridge removably and rotatably supported in the tubular housing. A removable cover at one end of the housing provides access to the housing for insertion and removal of the filter cartridge. A first rotary support for one end of the filter cartridge is mounted on the removable cover and includes a short shaft supported by the cover and a hub assembly rotatably mounted on the short shaft. The hub assembly is releasably secured to one end of the filter cartridge. A pair of successively smaller diameter tubular extensions are provided at the other end of the housing through which clean air passes outwardly from the filter. A second rotary support for the filter cartridge includes a turntable mounted inside of the housing by a tubular neck which is journaled inside of the first tubular extension. The turntable has a peripheral flange which snugly engages the other end of the filter cartridge with a friciton fit.

Abstract: A bypass blower provides air for combustion and scavenging purposes to a two-stroke diesel engine having an exhaust port from which an exhaust conduit ducts exhaust materials through a particulate trap and then to the atmosphere. An air atomizing nozzle is provided for introducing atomized supplemental fuel into the exhaust conduit upstream of the trap and a supply of supplemental fuel and compressed air is provided. A microprocessor-based control unit is adapted to operate the bypass blower under a condition of reduced bypass during normal operation of the engine. However, when backpressure in an exhaust conduit rises to a predetermined level due to particulate build-up, the bypass blower setting is changed to increase the amount of bypass of scavenging air in order to reduce the trapped air/fuel ratio and raise the temperature of the exhaust materials. Compressed air and supplemental fuel are then delivered to the nozzle to promote burning of the exhaust materials and regeneration of the respective trap.

Abstract: A control device for an air filter or dust collector equipped with a reverse pulse air cleaning system wherein the pressure differential across the air filter is continuously monitored and compared to a reference set point pressure differential. When the pressure differential across the air filter is greater than or equal to the reference set point pressure differential, a cleaning cycle is initiated. At the end of the cleaning cycle a new pressure differential across the air filter is measured and compared to the pressure differential before cleaning. If the new pressure differential is lower, it is stored and another cleaning cycle is initiated. This cycle is repeated until the "after" pressure differential is equal to or greater than the "pre-cleaning" pressure differential. At this point, a new reference set point pressure differential is calculated and the initial monitoring cycle is repeated until the pressure differential across the filter becomes equal to or greater than the new reference set point.

Abstract: Dirty air contaminated with cotton dust or the like is alternately directed against the left-hand section of a filter screen, then the right-hand section by a pair of movable baffle plates or vanes. While the dirty air impinges upon one section of the filter screen, backwash air is blown in the reverse direction through the opposite section of the other section to flush the impurities there collected. Upon receipt of a pressure differential generated signal that the one side is loaded, the baffle plates or vanes are moved to the opposite position whereby the one section of the filter screen is cleaned by the backwash air while the dirty air impinges upon the opposite side section. The interior of the filter apparatus is so constructed that the backwash air, after passing through the filter screen in the reverse direction circulates back beneath the vanes and exits in the forward direction through the screen with the clean air.

Abstract: A textile machine filter has its filter surface divided into zones which can be independently wiped by a stripper movable into juxtaposition with the zones or by respective strippers assigned to each one. A common collection space is provided beneath the filter surface to receive the contaminants from each zone.

Abstract: A process and system for the regeneration of at least a pair of side-by-side particulate filter traps for purifying the exhaust gas of an internal combustion engine, particularly a motor vehicle diesel engine, by oxidation of particulates collected in the traps, combustion of the particulates being carried out during engine operation by fuel burners respectively associated with the traps, in which a flame jet at high velocity flow is directed from one of the burners for a short duration transversely to the inflow direction of the exhaust gas to be purified directly into an associated trap without mixing with the exhaust gas flow, such that the exhaust gas in the vicinity of the one burner is diverted by the one flame jet to flow into and through the other trap while the one flame jet initiates combustion of the particulates collected in its associated trap.

Abstract: Filter hoses in a dust filter of a silo are cleaned by blowing air into the hoses in a shocklike manner when there is a predetermined overpressure in the silo. At least one additional cleaning cycle occurs after the overpressure drops.

Abstract: A particulate trap system used with a diesel engine has an exhaust conduit ducting exhaust materials through an exhaust cooler, then through a particulate trap, and then to the atmosphere. A by-pass conduit is connected in parallel with the exhaust cooler, and valves are located in the exhaust conduit and the by-pass conduit. A microprocessor-based control unit is arranged to allow normal operation with the exhaust materials passing through the cooler. However, when backpressure in the exhaust conduit reaches a predetermined level due to particulate build-up in the trap, the valves are gradually reversed, so that non-cooled exhaust materials arrive at the trap, thus regenerating it due to combustion.

Abstract: A pump (B) pumps water from a swimming pool (A) to a forward/reverse direction control valve (D). The control valve (D) has a first or forward flow state in which it channels water into an inlet (20) of a filter (C) and from a filter outlet (24) back to the swimming pool and a second state in which it channels the water into the fluid outlet (24) and from the fluid inlet to a drain (28). A microprocessor based electronic control circuit (E) selectively actuates the pump at preselected intervals for preselected durations such that the water from the swimming pool is intermittently filtered. The control circuit further monitors the fluid pressure with a low pressure limit switch (46). In response to the pumped fluid pressure failing to achieve a low limit within a preselected duration, the control circuit terminates operation of the pump. Further, the control circuit monitors the water pressure with a high pressure limit switch (48).

Abstract: An internal combustion engine is provided in its exhaust system with a particulate filter for trapping combustible particulates contained in exhaust gas. A combustion promoting material injection device is provided for injecting a material for promoting combustion of the combustible particulates into the exhaust system upstream of the particulate filter. Further there are provided a bypass exhaust passage which bypasses the combustion promoting material injection device and the particulate filter, and a flow control valve which controls the amount of exhaust gas flowing through the bypass exhaust passage to control the amount of exhaust gas flowing into the particulate filter when said combustion promoting material is to be injected from the injecting device.

Abstract: The present invention relates to a filter cleaning device, preferably for the cleaning of gases, such as welding fumes. To provide a filter cleaning device which efficiently cleans the filter without need for dismounting it, the filter cleaning device comprises at least one rotary filter (10) with outwardly directed projections (17), and at least one impeding device (12) which upon rotation of the filter (10) causes the projections (17) to give way and permits them to revert, whereby a shaking movement is imparted to the projections (17) to make them shake off the impurities adhering to them and toss the impurities aside by the action of the rotation of the filter (10).

Abstract: A detector for particulate density and the filter for trapping particulates which includes the detector includes a heat resistant insulating member and a pair of electrodes disposed on or within the surface of the filter. When the conductive particulates are attached on the heat resistant insulating member, the resistance of the member is decreased, and reversely, when the particulates are burned away from the member, the resistance is increased. Therefore, by detecting the resistance variation, the particulate density can be measured accurately and the optimum timing to refresh the filter can be determined. The detector is heat resistive, and also can detect whether the filter is completely refreshed or not. The surface of the heat resistant insulating member may be formed to be irregular so that the particulates are easily attached to the member resulting in an increase in measurement precision.

Abstract: An apparatus and method for removing particulate solids from gaseous streams wherein a multi-sectional separator drum rotates at high speed within a casing, there being air seal means effectively sealing each of the sections from each other in the space between the casing and the rotating drum. Within each of the sections, the periphery of the drum is foraminous with an air flow space of diminished radius inwardly of the periphery through which the airstream is withdrawn in a generally axial direction, through fan blades which rotate with the drum, into an annular flow space between the foraminous periphery of the succeeding separator section of the drum and the casing. The dirty airstream is introduced tangentially to the drum in the direction of rotation thereof in the first separator section and proceeds through each succeeding separator section of the drum until it is discharged as a cleaned gas stream from the last of the separator sections.

Abstract: An apparatus and method for continuously regenerating a particulate filter trap comprises: movable means effective to shield a segment of the trap entrance face from the full flow of exhaust gas while permitting a portion of the exhaust gas flow to bleed therethrough; (b) electrical resistance heating means having a movable heating element carried by the shield and interposed between the trap face and the shield; and (c) means for substantially continuously moving the shield and element conjointly across the trap face to ignite one or more columns of the particulates in the trap aligned with the shield and element. The ignited particles and bleed flow cause oxidation to proceed throughout the extent of the columns of particulates without need for additional exterior heat.

Abstract: A filter traps particles suspended in exhaust gas emitted from an engine. Degree of clogging of the filter is measured. It is indicated that the measured degree of clogging of the filter is equal to or greater than a first reference level. When the measured degree of clogging of the filter is equal to or greater than the first reference level and a manual switch is in an ON position, the particles deposited on the filter are burned off. When the measured degree of clogging of the filter is equal to or greater than a second reference level, the particles deposited on the filter are burned off independent of whether or not the manual switch is in the ON position. The second reference level is greater than the first reference level. It may be indicated that the particles deposited on the filter are being burned off.

Abstract: Apparatus for removing black fumes from exhaust gas from an internal combustion engine includes a filter mounted on an exhaust pipe of the engine. The filter includes a body defining a filter chamber and a filter element mounted within the filter chamber for collecting carbon particles constituting the black fume. A solution dispersing device is provided for dispersing a solution of catalyst to the exhaust gas in the filter chamber at a position upstream of the filter element to cause the oxidation of the carbon particles collected in the filter element to remove them therefrom. There is also disclosed a method of removing black fume from exhaust gas from the internal combustion engine.

Abstract: Effluent with entrained particles is drawn through a filter module (A) by an exhaust blower (B). The filter module includes an inertial separator (C) for providing an inertial separation of particles from the effluent air and a plurality of filter cartridges (D) which allow air to pass therethrough but not particles. A plenum E interconnects the filter cartridges with the exhaust blower to channel the filtered air from the filter module to the exhaust blower. A flow controller (F) controls the flow rate of air through each of the filter cartridges maintaining it substantially constant. The flow controller includes a flow rate sensor for sensing the flow rate through each filter cartridge and a butterfly damper blade for selectively restricting the plenum to maintain the flow rate substantially constant. A filter cartridge cleaner (G) is selectively actuated when the flow controller is unable to maintain a preselected minimum flow rate.

Abstract: A particulate removing device comprises a regenerating burner connected via an interrupting valve to a mixer subsequently connected to a particulate filter. The interrupting valve may be disposed in a housing for the burner on that end portion connected to the mixer through an exit to open and close the exit. When the burner generates a combustion gas, the valve opens the exit to permit the combustion gas to enter the mixer where it is mixed with an exhaust gas from a Diesel engine. The mixed gas heats and regenerates the particulate filter. When the burner is not used, the valve closes the exit to prevent the exhaust gas from the mixer from partly entering the burners housing. Alternatively, the interrupting valve may be disposed in a housing for the mixer on that end portion connected to the burner's housing through an exit to open and close the inlet.

Abstract: An annular air filter is rotationally mounted within a plenum box, which in turn is securely mounted to the inlet end of a gas turbine engine. At least a portion of the annular air filter surrounds the inlet end of the engine. A motor is provided to rotationally drive the air filter relative to both the plenum box and the engine. An air pressure nozzle is disposed adjacent the inner circumferential surface of the air filter, and a vacuum nozzle is disposed adjacent the outer circumferential surface thereof. The air pressure and vacuum nozzles clean the air filter as the air filter is rotated relative thereto.

Abstract: An exhaust emission control apparatus for a Diesel engine includes a filter collecting particulates contained in exhaust gases of the Diesel engine and a fuel supply device supplying fuel required for burning the collected particulates. The fuel supply device controls the amount of supplied fuel so that the temperature of the filter can be raised to a level high enough for burning the collected particulates but not so high as to damage the filter itself by the heat applied thereto. A control unit executes the fuel control on the basis of the temperature of the filter and the pressure drop across the filter.

Abstract: A filter is disposed in the exhaust passage of an internal combustion engine in order to trap particles suspended in exhaust gas. A burner serves to burn off the particles deposited on the filter. Either the pressure in the exhaust passage at a point upstream of the filter or the pressure difference in the exhaust passage across the filter is selectively sensed. In place of sensing the pressure difference, the pressure in the exhaust passage at a point downstream of the filter may be sensed. The ratio between the upstream pressure and the pressure difference, or the ratio between the upstream pressure and downstream pressure is determined an as indication of the degree of clogging of the filter. The burner is operated on the basis of this ratio.

Abstract: An apparatus controls the operation of a regenerative device for generating a quantity of heat to burn the exhaust particles collected in a trap located in the exhaust conduit of an internal combustion engine. The apparatus is responsive to the pressures on the inlet and outlet sides of the trap for calculating a pressure differential across the trap and a threshold value for comparison therewith as a function of the pressure on the inlet side of the trap. The apparatus operates the regenerative device to regenerate the trap when the pressure differential across the trap reaches the calculated threshold value.

Abstract: An exhaust cleaner system for a diesel engine comprising a cleaner having a filter and also having upstream and downstream compartments on respective sides of the filter, carbon particulates in the exhaust gases from the engine being trapped in the filter as the exhaust gases flow through the cleaner, a burner for producing a high temperature combustion gas necessary to elevate the temperature of the exhaust gases, an air supply device for supplying air to the burner, a fuel supply device for supplying fuel to the burner, and an air pressure regulator for increasing the air supply pressure in correspondence with the increase of the exhaust gas pressure upstream of the filter.

Abstract: A filter disposed in an engine exhaust passage traps particles suspended in exhaust gas. A burner serves to burn off the particles deposited on the filter. The pressures in the exhaust passage at points upstream and downstream of the filter are sensed. A determination is made as to whether or not the sensed upstream pressure is lower than a preset level. When the sensed upstream pressure is not lower than the preset level, the degree of clogging of the filter is deduced on the basis of the sensed upstream and downstream pressures. When the sensed upstream pressure is lower than the preset level, the degree of clogging of the filter is deduced on the basis of a time elapsed since the moment at which the sensed upstream pressure dropped below the preset level and on the basis of the sensed upstream and downstream pressures obtained immediately prior to that moment.

Abstract: An apparatus for controlling the supply of air to a burner used to recombust diesel particulates trapped in a ceramic filter. The inventive control apparatus includes an exhaust bypass line that bypasses the filter, an air supply line leading to a burner associated with the filter, a flow control valve that adjusts the cross-sectional area for the air flow in the air supply line, a relief valve that maintains a constant difference between pressures at points upstream and downstream of the flow control valve, and a control unit that controls the degree of opening of the flow control valve. With the invention, precise control over the flow rate of secondary air is ensured.

Abstract: A combustion apparatus for a vehicle for regenerating a filter provided in an exhaust gas passage of an engine by burning and removing fine particles in the exhaust gas comprising an air supply passage for coaxially supplying air along the outer periphery of a fuel injection nozzle, a shut-off valve mounted at the downstream side end of said combustion chamber for preventing reverse flow of the exhaust gas, and a controller for allowing the inflow of the coaxial air for a predetermined period of time after stopping the fuel supply from the fuel injection nozzle and then closing the shut-off valve.

Abstract: An exhaust particle cleaning device for a diesel engine includes a trap case provided in a passage way of exhaust gas. A filter material is disposed in the trap case so that carbon particles or other exhaust particles contained in the exhaust gas can be caught within the filter material during the time the exhaust gas is passed through the filter material. A plurality of electric heater elements are spread or dispersed on the upstream end face of the filter material, so that the exhaust gas passes through the areas defined between the plurality of heater elements. The electric heater element may be coated with a ceramic material.

Abstract: An exhaust emission control system for a diesel engine including a trap in the form of a filter formed of heat-resistant material for trapping carbon particulates. The trap has no directionality with respect to air permeability, and combustion gas, for heating the trap or a fuel for activating a catalyst provided to the trap, is supplied to the trap from a direction substantially perpendicular to a direction in which an exhaust gas flows from the engine to the trap. Upon a blocking of the trap as a result of an accumulation of the trapped carbon particulates, the trapped carbon particulates can be removed by oxidation treatment, to thereby enable regeneration of the trap to be effected with a high degree of efficiency.

Abstract: An apparatus is disclosed for regenerating a filter trap used to collect particulates from the exhaust gas of an internal combustion engine. The apparatus comprises: (a) an assembly providing a flow of a heat transfer medium through the filter trap: (b) an assembly for heating the heat transfer medium to a temperature effective to incinerate the particulates in the filter trap: and (c) a flow mask stationed in the flow of heat transfer medium, upstream from said filter trap, effective to divert the heat transfer medium away from the radially inner zone of the filter trap while guiding the heat transfer medium to engage and ignite the particulates along a radially outer region of the filter trap. The mask is a circular disc and spaced upstream from the filter trap effective to mask a central core area of the flow of heat transfer medium.

Abstract: A method and apparatus is disclosed for initiating the energization of a regenerative apparatus used with a particulate filter trap having a porosity effective to extract particulates from the exhaust gas flow of an internal combustion engine. The method comprises: (1) sensing the actual pressure drop across the filter trap and sensing the pressure drop across an open channel simulative filter structure; (2) converting the pressure drops to proportional voltages and ratioing the voltage of the filter trap pressure drop to the product of a constant and the voltage of the simulative filter structure pressure drop; and (3) using the resultant voltage ratio to control the energization of the regeneration apparatus when the output exceeds a predetermined allowable limit, e.g., 2-8 volts.

Abstract: A gas filter apparatus and method utilize cylindrical pleated paper filters arranged to collect particulates on the interior of the filters from scavenging gas flowed through the filters. The particulates are removed by applying a high pressure gas pulse to an air chamber in a cylindrical housing surrounding each filter in spaced relation which forces the removed particulates axially through an open end of the filter.

Abstract: An exhaust gas cleaning device provided with a filter member for collecting particulates in the exhaust gases, and an electric heater for burning and eliminating the particulates collected by the filter member, is disclosed. The filter member is formed of electrically insulating ceramic and is installed in the exhaust gas passage. The heater is formed of ceramic provided with a large number of open passages and having electric conductivity or electrically insulating property. The heater is closely adhered to the exhaust gas inlet end surface of the filter member. In the case that the electrically conductive ceramic is used, the ceramic itself acts as a heating element which heats and ignites the collected particulates. In the case that the electrically insulating ceramic is used, a metallic film acting as a heating element is formed on the walls of the ceramic defining the open passages by printing, vacuum evaporating or other method.

Abstract: An exhaust passage extends from an internal combustion engine to conduct exhaust from the engine. A filter is disposed in the exhaust passage to filter particles out of the exhaust. A burner is disposed in the exhaust passage upstream of the filter to burn off the particles deposited on the filter. Fuel is supplied to the burner for a preset time when the filter clogs. The supplied fuel is ignited in the burner. In the case where the fuel supplied to the burner ceases to burn prior to the end of the preset time, the fuel supply to the burner is interrupted.

Abstract: An apparatus controls the operation of a regenerative burner having a glow plug operable to ignite and burn a combustible mixture supplied into the burner to burn the exhaust particles collected in a trap located in the exhaust conduit of an internal combustion engine when a trap regeneration requirement occurs. A control device is provided which detects a broken wire in the glow plug and stops the supply of combustible mixture to the burner in the presence of brokage of the glow plug wire.

Abstract: A diesel particulate filter system for treating the exhaust gas of a diesel engine which is small in size and inexpensive. The system includes a particulate filter connected in a gas line from the engine, a burner, including an ignition plug, connected at a point upstream of the particulate filter and which is supplied with fuel, a primary air flow for atomizing the fuel, and a secondary air flow for burning the particulates trapped in the particular filter and which supplies the particulate filter with a hot burning gas produced by the ignition plug. Primary and secondary pumps supply, respectively, the primary and secondary air flows. A single motor drives both the primary and secondary air pumps. The ignition plug and motor are controlled so that when the amount of particulates trapped in the filter exceeds a preset level, the ignition plug and motor are activated to clean the filter by burning the particulates in the burner.

Abstract: A method of removing soot from the exhaust gases of internal combustion engines, especially of the diesel-type, using an exhaust filter which collects the soot and a dosing device which, when triggered by a pressure switch and a series-connected temperature switch, injects a dose of a combustion-inducing substance onto the soot layer with the aid of compressed air. The combustion-inducing substance consists of CuCl and NH.sub.4 NO.sub.3 which are stored as a mixture in a single container or as separate ingredients in two containers.

Abstract: A carbon particulates cleaning device for collecting carbon particulates in exhaust gases discharged from an internal combustion engine and burning off the collected carbon particulates, is disclosed. The carbon particulates cleaning device comprises a heat resistant filter member, an electric heater which is provided on the upstream end surface of the filter member for regenerating the filter member, and an electric power source for supplying electric current to the electric heater. The electric heater is composed of at least two kinds of heating resistors, each of which applies different electric power to a unit area of the upstream end surface of the filter member. At the filter member regenerating time, electric current is supplied to the heating resistors successively in the order of from one providing the maximum electric power density to one providing the minimum electric power density.

Abstract: A method for removing particulates from internal combustion exhaust gases in a system which includes a first gas conduit which connects with an engine exhaust pipe and which communicates with a series of trap chambers containing means for filtering or trapping particulate matter present in the exhaust gas. Means for heating gas passing through said first gas conduit is provided upstream of the first trap chamber. A second gas conduit connects with said first gas conduit at a location upstream of the first trap chamber by virtue of which exhaust gas can be made to flow in a path which by-passes any number of trap chambers in the series but which flows through subsequent trap chambers. Valve means are associated with said second gas conduit to selectively by-pass or direct exhaust gas flow through desired trap chambers.

Abstract: A method for controlling the cleaning of multiple-baghouse fabric filter systems. Each baghouse includes a plurality of compartments and a cleaning system of a type which cleans the compartments in a compartment-by-compartment sequence and which allows all compartments not being cleaned to maintain the baghouse on-line even during a cleaning operation. The particular cleaning system disclosed more particularly is of the reverse gas flow type. A normal characteristic of reverse gas flow cleaning is that system pressure drop goes through sequential peaks and minimums. In the systems disclosed herein, the cleaning cycles of the individual baghouses are staggered in a manner such that the peak resistance during cleaning of one baghouse does occur at the same time as a lower and offsetting resistance of another baghouse. Thus, peak pressure drop of the system as a whole is reduced. Moreover, the difference in pressure loss from peak to minimum is reduced.

Abstract: An exhaust emission control device for Diesel engines comprising a trap disposed in an exhaust pipe connected to an exhaust manifold and a trap-heating burner disposed outside the exhaust pipe, whereby a combustion gas from the burner is led to the outer peripheral portion of the trap to heat the same.According to the exhaust emission control device for Diesel engines of the present invention, the stable oxidation of particulates collected on the trap in the exhaust pipe is achieved independently of the flow rate of the exhaust gas, the exhaust pressure and the amount of O.sub.2 in the exhaust gas.