US20040231320A1 - Apparatus for reducing particulate emissions - Google Patents
Apparatus for reducing particulate emissions Download PDFInfo
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- US20040231320A1 US20040231320A1 US10/443,372 US44337203A US2004231320A1 US 20040231320 A1 US20040231320 A1 US 20040231320A1 US 44337203 A US44337203 A US 44337203A US 2004231320 A1 US2004231320 A1 US 2004231320A1
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- particulates
- chargeable
- arc
- exhaust gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/01—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust by means of electric or electrostatic separators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the field of the invention relates to a system for removing particulate matter from exhaust gas of internal combustion engines, particularly from diesel-powered motor vehicles.
- the internal combustion engine is an important part of an automobile. It is generally known that the internal combustion engine, especially the diesel engine, releases exhaust gasses that may contain particulate matter. Tightening emissions requirements continue to allow lower and lower amounts of particulate emissions from consumer and commercial vehicles. The challenge of meeting the requirements becomes difficult, and current solutions each has its drawbacks.
- the first solution is with engine management. While it is debated as to whether engine management can continue to meet the particulate matter emissions level, engine management may reduce overall engine performance to achieve the requirement.
- the second solution is a particulate filter with regeneration.
- Various kinds of filters or trapping devices have been employed. However, a “dirty” diesel engine may emit on the order of one kilogram of particulate matter in 1000 miles (1609 kilometers) of continuous operation. After continued trapping, the accumulated particulate matter may create back pressure that may adversely affect the operation of the engine. Vehicles which utilize filter elements for trapping exhaust particulates must therefore employ regeneration means for dealing with this problem.
- U.S. Pat. No. 4,450,681 discloses a carbon particulate cleaning device including a carbon particulate catching means, a fuel injecting means, a fuel igniting means for igniting the fuel, and a gas blowing means which blows gas for maintaining the fuel burning and applying the heat of the burning fuel into the carbon particulates.
- the carbon particulates caught by the carbon particulate catching means are effectively burnt and eliminated.
- U.S. Pat. No. 4,485,621 discloses a similar system that includes a trapping chamber and a regeneration chamber.
- the filtering chamber includes a means for filtering or trapping particulate matter present in the exhaust gas.
- the regenerating chamber contains an electrically conductive substrate which carries an oxidation catalyst.
- the electrically conductive substrate material is part of an electrical circuit and is heated by electric current.
- Means are provided for injecting a combustible fuel into the regenerating chamber where the fuel-exhaust gas mixture is effectively heated and burned. The resulting heated gas then passes into the trapping chamber to incinerate and burn off the particulates.
- U.S. Pat. No. 4,538,412 discloses a cleaning device for exhaust particulates of a diesel engine.
- the cleaning device contains a trap case provided in a main passageway of the exhaust gas, a filter material disposed in the trap case to catch carbon particulates or other exhaust particulates contained in the exhaust gas, and an electric heater for igniting and burning the exhaust particulates in the filter material.
- U.S. Pat. Nos. 4,538,441 and 4,544,388 teach the use of a monolithic honeycomb ceramic trap to collect the carbon particulates emitted from a diesel engine then heating an air flow through the ceramic trap using an electric heater to a temperature sufficient to ignite the collected carbon particulates.
- U.S. Pat. Nos. 4,655,037 and 4,670,020 teach the use of one or more metal octoates added to diesel fuel to produce a reducible metal oxide which reduces the ignition temperature of the collected carbon particles to a range from 250° C. to 310° C.
- U.S. Pat. No. 5,758,496 discloses a particulate and exhaust gas emission control system having a particulate trap, an additive tank for storing a fuel additive effective to depress the ignition temperature of the carbon particulates, and means for metering the additive to the fuel tank.
- the particulate trap has a layer of catalytic material to promote the oxidation of carbon monoxide and unburned hydrocarbons emitted by the diesel engine.
- the present invention provides an apparatus for cleansing particulate matter from exhaust gas that is released by an engine such as a diesel-powered engine.
- the apparatus includes electrically chargeable device positioned in the path of the exhaust stream, providing an electric field through which the exhaust gasses must pass.
- the presence of the particulate matter, which is relatively electrically conductive, as compared to exhaust gas, will locally reduce the dielectric constant of the exhaust gas. If sufficient electrical potential is charged to surfaces within the exhaust stream, then an electrical arc will pass through the particulates. The heat generated by the electrical arc will cause the particulates to combust, resulting in emissions of carbon dioxide and, if any hydrogen is in the particulates, water.
- the apparatus of the present invention includes a chargeable device having at least one pair of surfaces that are chargeable with opposite charges.
- the chargeable surfaces positioned relative to one another bordering a gap in which an electric field may be created when the chargeable surfaces are charged with opposite charges.
- the electric field is sufficient to generate an arc through or near particulates passing between the surfaces. This arc produces sufficient heat to cause the particulate matter in exhaust gas to combust.
- the apparatus of the present invention further includes an electrical charger electrically connected to the chargeable device for providing charges to the chargeable surfaces of the chargeable device.
- each of the chargeable surfaces is defined on one of perforated plates having a plurality of holes for allowing the exhaust gas stream to flow therethrough.
- the perforated plates or the chargeable surfaces of the perforated plates are made of electrically conductive material.
- the plurality of perforated plates may be linked together along the edges by a connector made of electrically insulating and optionally heat insulating material.
- the connector may be a pair of bridges, plates, or a cylindrical housing made of electrically insulating material.
- the present invention further includes a method for reducing particulate emissions from internal combustion engines having an exhaust system.
- the method involves providing at least one pair of electrically chargeable surfaces facing each other. A gap is provided between the chargeable surfaces.
- the electrically chargeable surfaces are positioned to receive exhaust gas containing exhaust particulates.
- the method includes supplying opposite electrical charges to the electrically chargeable surfaces to generate an electrical arc through or near any particulates present in the gap. This arc produces a large amount of heat in its vicinity.
- the method includes passing exhaust gas containing particulate matter into the gap and heating the particulate matter to combustion at or near the arc.
- One advantage to the device of the present invention is that particulate combustion is continuous. There is no need to monitor flow rates and determine when to regenerate a filter. This results in a much simpler electrical system. Furthermore, the backpressure of the plates may be far less than the backpressure resulting from a filter. Additionally, the amount of power required to maintain the electrical charge on the plates and supply the electrical arc may be less than the power required to run the pumps and relays needed for known burner-based solutions. Furthermore, since no fuel and significantly less additional air are required, installation is much simpler and less expensive.
- FIG. 1. is a side elevational view of an apparatus for reducing particulate emissions according to one embodiment of the present invention
- FIG. 2 is a front elevational view of a perforated plate according to the embodiment shown in FIG. 1;
- FIG. 3 is a side elevational view of a chargeable device according to another embodiment of the invention.
- FIG. 4 is a cross-sectional view of a chargeable device of the present invention, disposed within an exhaust pipe.
- apparatus 10 represents an exemplary embodiment of the present invention.
- Apparatus 10 consists of chargeable device 20 connectable to charger 30 .
- Chargeable device 20 defines first plate 11 positioned parallel to second plate 12 .
- First plate 11 defines outer surface 13 and inner surface 14 .
- Second plate 12 defines outer surface 15 and inner surface 16 .
- Gap 50 formed between inner surfaces 14 and 16 may be about 1.0 mm to about 80 mm wide. A preferred width of gap 50 may be about 12 mm.
- Plates 11 and 12 may be linked together by connector 40 .
- Connector 40 may be a pair of bars, plates or a cylindrical tube that holds plates 11 and 12 together in the parallel position.
- Plates 11 and 12 may be made of any electrically conductive material such as stainless steel, steel, or copper, whereas connector 40 may be made of electrically insulating material, which may also be heat resistant material.
- connector 40 may be made of ceramic.
- plate 11 has an electrical port 17 , which is connected to terminal 31 of charger 30 .
- plate 12 has an electrical port 18 , which is connected to terminal 32 of charger 30 .
- Either terminal 31 or 32 can be a positive terminal, while the other is a negative terminal.
- either plate 11 or 12 can be charged with positive charges, while the other is charged with negative charges.
- plate 11 may have inner surface 14 made of an electrically conductive material, while outer surface 13 is made of electrically insulating material.
- plate 12 may have inner surface 16 made of an electrically conductive material, while outer surface 15 is made of an electrically insulating material such as ceramic.
- surfaces 14 A and 16 A are chargeable.
- Charger 30 provides electrical charges to chargeable surfaces 14 A and 16 A so that surfaces 14 A and 16 A carry opposite charges.
- Charger 30 may produce either a direct current (DC) or an alternating current (AC).
- Charger 30 may include a step up transformer capable of charging the chargeable surfaces 14 A and 16 A to about 20,000 to about 100,000 volts.
- a power source for the charger may include the battery and current electrical system of a motor vehicle.
- the relationship between the voltage of the chargeable surfaces 14 A and 16 A and the width of gap 50 determines the strength of the electrical field created within gap 50 . It is important to create an electric field strong enough to produce an arc when exhaust particulates are present in gap 50 .
- the voltage of the chargeable surfaces 14 A and 16 A varies depending on the width of gap 50 .
- chargeable surfaces 14 A and 16 A should carry about 20,000 volts, when gap 50 is about 1.0 mm in width.
- chargeable surfaces 14 A and 16 A would carry in excess of 100, 000 volts, when gap 50 is adjusted to 80 mm in width.
- plates 11 and 12 are perforated or have a plurality of holes 22 and 23 , respectively, for allowing exhaust gas stream to flow into gap 50 .
- the sizes of holes 22 and 23 may not necessary be the same.
- Holes 22 should be large enough to allow exhaust particulates to pass readily into gap 50 .
- Holes 23 may not be the same size as holes 22 .
- holes 22 and 23 should allow exhaust gas to flow through easily without creating back pressure in the exhaust system.
- perforated plate 11 is a circular screen, having holes 22 spreading evenly over plate 11 .
- perforated plate 12 may also be made of the same type of screen.
- the shape of perforated plates 11 and 12 may not necessarily be circular, as long as perforated plates 11 and 12 can be positioned in the path of the flow of the exhaust gas, and efficiently receive the flow of the exhaust.
- the apparatus of the present invention may include chargeable device 70 having a plurality of perforated plates 71 , 72 , 73 , and 74 positioned in parallel to one another.
- Perforated plate 71 defines chargeable surface 71 A that faces gap 91 and chargeable surface 72 A of perforated plate 72 .
- Perforated plate 73 defines chargeable surface 73 A that faces gap 92 and chargeable surface 74 A of perforated plate 74 .
- Perforated plates 71 - 74 further define electrical ports 81 , 82 , 83 , and 84 for connecting to a charger (not shown).
- the charger provides electrical charges to chargeable surfaces 71 A- 74 A.
- Chargeable surfaces 71 A and 72 A will carry opposite charges, and chargeable surfaces 73 A and 74 A will carry opposite charges.
- chargeable surfaces 71 A and 73 A receive positive charges from the charger, whereas chargeable surfaces 72 A and 74 A receive negative charges from the charger.
- chargeable surfaces 71 A- 74 A When chargeable surfaces 71 A- 74 A are charged, electric fields are created within gaps 91 and 92 .
- gaps 91 and 92 are adjusted to create electrical field strength sufficient to produce an arc when the exhaust particulates are present, as described hereinabove.
- Chargeable surfaces 71 A and 72 A may carry a higher voltage than chargeable surfaces 73 A and 74 A, resulting in a stronger electrical field in gap 91 than in gap 92 .
- perforated plates 71 - 74 may be connected to one another by connector 80 .
- connector 80 may be a cylindrical tube which may be made of an electrically insulating material, and optionally heat insulating material.
- perforated plates 71 - 74 define a plurality of holes 93 , 94 , 95 and 96 , respectively.
- the sizes of holes 93 - 96 may vary, however, holes 93 - 96 should allow the exhaust gas and the particles to flow therethrough.
- the apparatus comprises of chargeable device 100 disposed within an exhaust pipe 130 of an engine.
- Chargeable device 100 consists of metal screens 101 and 102 having chargeable surfaces 101 A and 102 A, respectively. Metal screens 101 and 102 are separated by gap 105 .
- Metal screen 101 and 102 are connected to a charger (not shown) through electrical ports 106 and 107 , respectively. Metal screens 101 and 102 are charged with opposite charges, creating an electrical field between charged surface 101 A of metal screen 101 , and charged surface 102 A of screen 102 .
- exhaust gas (G) including carbon or hydrocarbon particles (P) or both flows through screen 101 into gap 105 .
- extra air (A) may be supplied to the exhaust gas flow, before the exhaust gas flows through device 100 .
- the extra air provides oxygen that supports combustion of the particulate matter.
- the oxygen and the carbon particles will form carbon dioxide after the combustion.
- the oxygen and the hydrocarbon particles will form water and carbon dioxide after the combustion.
- the product of the combustion may be released through screen 102 and disposed elsewhere.
- the combustion can occur in both gaps 91 and 92 .
- the exhaust particulates that escape the first combustion in gap 91 may be combusted later on in gap 92 .
Abstract
Description
- 1. Field of the Invention.
- The field of the invention relates to a system for removing particulate matter from exhaust gas of internal combustion engines, particularly from diesel-powered motor vehicles.
- 2. Description of the Related Art.
- The internal combustion engine is an important part of an automobile. It is generally known that the internal combustion engine, especially the diesel engine, releases exhaust gasses that may contain particulate matter. Tightening emissions requirements continue to allow lower and lower amounts of particulate emissions from consumer and commercial vehicles. The challenge of meeting the requirements becomes difficult, and current solutions each has its drawbacks. The first solution is with engine management. While it is debated as to whether engine management can continue to meet the particulate matter emissions level, engine management may reduce overall engine performance to achieve the requirement. The second solution is a particulate filter with regeneration. Various kinds of filters or trapping devices have been employed. However, a “dirty” diesel engine may emit on the order of one kilogram of particulate matter in 1000 miles (1609 kilometers) of continuous operation. After continued trapping, the accumulated particulate matter may create back pressure that may adversely affect the operation of the engine. Vehicles which utilize filter elements for trapping exhaust particulates must therefore employ regeneration means for dealing with this problem.
- A number of diesel exhaust gas cleaning devices that include filter regeneration means has been proposed in the following patents:
- U.S. Pat. No. 4,450,681 discloses a carbon particulate cleaning device including a carbon particulate catching means, a fuel injecting means, a fuel igniting means for igniting the fuel, and a gas blowing means which blows gas for maintaining the fuel burning and applying the heat of the burning fuel into the carbon particulates. The carbon particulates caught by the carbon particulate catching means are effectively burnt and eliminated.
- U.S. Pat. No. 4,485,621 discloses a similar system that includes a trapping chamber and a regeneration chamber. The filtering chamber includes a means for filtering or trapping particulate matter present in the exhaust gas. The regenerating chamber contains an electrically conductive substrate which carries an oxidation catalyst. The electrically conductive substrate material is part of an electrical circuit and is heated by electric current. Means are provided for injecting a combustible fuel into the regenerating chamber where the fuel-exhaust gas mixture is effectively heated and burned. The resulting heated gas then passes into the trapping chamber to incinerate and burn off the particulates.
- U.S. Pat. No. 4,538,412 discloses a cleaning device for exhaust particulates of a diesel engine. The cleaning device contains a trap case provided in a main passageway of the exhaust gas, a filter material disposed in the trap case to catch carbon particulates or other exhaust particulates contained in the exhaust gas, and an electric heater for igniting and burning the exhaust particulates in the filter material.
- U.S. Pat. Nos. 4,538,441 and 4,544,388 teach the use of a monolithic honeycomb ceramic trap to collect the carbon particulates emitted from a diesel engine then heating an air flow through the ceramic trap using an electric heater to a temperature sufficient to ignite the collected carbon particulates.
- The prior art has also explored the use of various catalyst materials to reduce the ignition temperature of carbon soot in order to preserve the system.
- For example, U.S. Pat. Nos. 4,655,037 and 4,670,020 teach the use of one or more metal octoates added to diesel fuel to produce a reducible metal oxide which reduces the ignition temperature of the collected carbon particles to a range from 250° C. to 310° C.
- U.S. Pat. No. 5,758,496 discloses a particulate and exhaust gas emission control system having a particulate trap, an additive tank for storing a fuel additive effective to depress the ignition temperature of the carbon particulates, and means for metering the additive to the fuel tank. The particulate trap has a layer of catalytic material to promote the oxidation of carbon monoxide and unburned hydrocarbons emitted by the diesel engine.
- While the above-described systems may work to reduce emissions of particulate matter from exhaust gas, these systems are expensive and require a significant amount of space for all of the necessary hardware. In addition, the required filter element of the disclosed solutions may generate exhaust backpressure with consequent adverse engine generation.
- What is needed is a system that eliminates or significantly reduces emissions of particulate material. Particularly needed is a system that is easy to assemble and fit in the exhaust system of internal combustion engines. Further needed is a system that is economical.
- The present invention provides an apparatus for cleansing particulate matter from exhaust gas that is released by an engine such as a diesel-powered engine. Generally, the apparatus includes electrically chargeable device positioned in the path of the exhaust stream, providing an electric field through which the exhaust gasses must pass. The presence of the particulate matter, which is relatively electrically conductive, as compared to exhaust gas, will locally reduce the dielectric constant of the exhaust gas. If sufficient electrical potential is charged to surfaces within the exhaust stream, then an electrical arc will pass through the particulates. The heat generated by the electrical arc will cause the particulates to combust, resulting in emissions of carbon dioxide and, if any hydrogen is in the particulates, water.
- In one embodiment, the apparatus of the present invention includes a chargeable device having at least one pair of surfaces that are chargeable with opposite charges. The chargeable surfaces positioned relative to one another bordering a gap in which an electric field may be created when the chargeable surfaces are charged with opposite charges. The electric field is sufficient to generate an arc through or near particulates passing between the surfaces. This arc produces sufficient heat to cause the particulate matter in exhaust gas to combust. The apparatus of the present invention further includes an electrical charger electrically connected to the chargeable device for providing charges to the chargeable surfaces of the chargeable device.
- In one aspect of the invention, each of the chargeable surfaces is defined on one of perforated plates having a plurality of holes for allowing the exhaust gas stream to flow therethrough. The perforated plates or the chargeable surfaces of the perforated plates are made of electrically conductive material. The plurality of perforated plates may be linked together along the edges by a connector made of electrically insulating and optionally heat insulating material. The connector may be a pair of bridges, plates, or a cylindrical housing made of electrically insulating material.
- The present invention further includes a method for reducing particulate emissions from internal combustion engines having an exhaust system. The method involves providing at least one pair of electrically chargeable surfaces facing each other. A gap is provided between the chargeable surfaces. The electrically chargeable surfaces are positioned to receive exhaust gas containing exhaust particulates. The method includes supplying opposite electrical charges to the electrically chargeable surfaces to generate an electrical arc through or near any particulates present in the gap. This arc produces a large amount of heat in its vicinity. Further, the method includes passing exhaust gas containing particulate matter into the gap and heating the particulate matter to combustion at or near the arc. Finally, included is the step of emitting exhaust gas with reduced particulate matter from the gap and automatically from the exhaust system.
- One advantage to the device of the present invention is that particulate combustion is continuous. There is no need to monitor flow rates and determine when to regenerate a filter. This results in a much simpler electrical system. Furthermore, the backpressure of the plates may be far less than the backpressure resulting from a filter. Additionally, the amount of power required to maintain the electrical charge on the plates and supply the electrical arc may be less than the power required to run the pumps and relays needed for known burner-based solutions. Furthermore, since no fuel and significantly less additional air are required, installation is much simpler and less expensive.
- The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention itself will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:
- FIG. 1. is a side elevational view of an apparatus for reducing particulate emissions according to one embodiment of the present invention;
- FIG. 2 is a front elevational view of a perforated plate according to the embodiment shown in FIG. 1;
- FIG. 3 is a side elevational view of a chargeable device according to another embodiment of the invention; and
- FIG. 4 is a cross-sectional view of a chargeable device of the present invention, disposed within an exhaust pipe.
- Corresponding reference characters indicate corresponding parts throughout the several views. Although the drawings represent embodiments of the present invention, the drawings are not necessarily to scale and certain features may be exaggerated in order to better illustrate and explain the present invention. The exemplification set out herein illustrates an embodiment of the invention, in one form, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
- The embodiments disclosed below are not intended to be exhaustive or limit the invention to the precise form disclosed in the following detailed description. Rather, the embodiments are chosen and described so that others skilled in the art may utilize their teachings.
- Referring now to FIG. 1,
apparatus 10 represents an exemplary embodiment of the present invention.Apparatus 10 consists ofchargeable device 20 connectable tocharger 30.Chargeable device 20 definesfirst plate 11 positioned parallel tosecond plate 12.First plate 11 definesouter surface 13 andinner surface 14.Second plate 12 definesouter surface 15 andinner surface 16.Gap 50 formed betweeninner surfaces gap 50 may be about 12 mm.Plates connector 40.Connector 40 may be a pair of bars, plates or a cylindrical tube that holdsplates Plates connector 40 may be made of electrically insulating material, which may also be heat resistant material. For example,connector 40 may be made of ceramic. - According to FIGS. 1 and 2,
plate 11 has anelectrical port 17, which is connected toterminal 31 ofcharger 30. Also as shown,plate 12 has anelectrical port 18, which is connected toterminal 32 ofcharger 30. Either terminal 31 or 32 can be a positive terminal, while the other is a negative terminal. Thus, eitherplate - In an alternative embodiment,
plate 11 may haveinner surface 14 made of an electrically conductive material, whileouter surface 13 is made of electrically insulating material. Similarly,plate 12 may haveinner surface 16 made of an electrically conductive material, whileouter surface 15 is made of an electrically insulating material such as ceramic. In this case, surfaces 14A and 16A are chargeable.Charger 30 provides electrical charges to chargeable surfaces 14A and 16A so that surfaces 14A and 16A carry opposite charges. -
Charger 30 may produce either a direct current (DC) or an alternating current (AC).Charger 30 may include a step up transformer capable of charging the chargeable surfaces 14A and 16A to about 20,000 to about 100,000 volts. A power source for the charger may include the battery and current electrical system of a motor vehicle. The relationship between the voltage of the chargeable surfaces 14A and 16A and the width ofgap 50 determines the strength of the electrical field created withingap 50. It is important to create an electric field strong enough to produce an arc when exhaust particulates are present ingap 50. Thus, the voltage of the chargeable surfaces 14A and 16A varies depending on the width ofgap 50. For example, chargeable surfaces 14A and 16A should carry about 20,000 volts, whengap 50 is about 1.0 mm in width. On the other hand, chargeable surfaces 14A and 16A would carry in excess of 100, 000 volts, whengap 50 is adjusted to 80 mm in width. - In one aspect of the invention, as shown in FIG. 1,
plates holes gap 50. The sizes ofholes Holes 22 should be large enough to allow exhaust particulates to pass readily intogap 50.Holes 23 may not be the same size as holes 22. However, holes 22 and 23 should allow exhaust gas to flow through easily without creating back pressure in the exhaust system. - In FIG. 2, a further exemplary embodiment of
perforated plate 11 is shown. In this embodiment,plate 11 is a circular screen, havingholes 22 spreading evenly overplate 11. Similarly, perforated plate 12 (not shown) may also be made of the same type of screen. The shape ofperforated plates perforated plates - In another embodiment, as shown in FIG. 3, the apparatus of the present invention may include
chargeable device 70 having a plurality ofperforated plates plate 71 defines chargeable surface 71A that facesgap 91 and chargeable surface 72A ofperforated plate 72. Perforatedplate 73 defines chargeable surface 73A that facesgap 92 and chargeable surface 74A ofperforated plate 74. - Perforated plates71-74 further define
electrical ports gaps gaps gap 91 than ingap 92. - In one aspect of the invention, perforated plates71-74 may be connected to one another by
connector 80. Similar toconnector 40 ofdevice 20, described earlier,connector 80 may be a cylindrical tube which may be made of an electrically insulating material, and optionally heat insulating material. - In another aspect, perforated plates71-74 define a plurality of
holes - The use of the apparatus of the present invention is demonstrated in FIG. 4. The apparatus comprises of
chargeable device 100 disposed within anexhaust pipe 130 of an engine.Chargeable device 100 consists ofmetal screens gap 105.Metal screen electrical ports metal screen 101, and charged surface 102A ofscreen 102. During an operation of the engine, exhaust gas (G) including carbon or hydrocarbon particles (P) or both flows throughscreen 101 intogap 105. Since carbon particles are electrically more conductive than air, the dielectric constant of exhaust gas withingap 105 decreases in the vicinity of a carbon particle. Electrical potential between the charged surfaces creates an electrical field through which the exhaust gas flows. Electric arcs will be created which pass through or near the carbon and/or hydrocarbon particles. The heat generated by the arc is sufficient to induce combustion of carbon and/or hydrocarbon particles. - In another aspect of the use of the instant apparatus, as shown in FIG. 4, extra air (A) may be supplied to the exhaust gas flow, before the exhaust gas flows through
device 100. The extra air provides oxygen that supports combustion of the particulate matter. The oxygen and the carbon particles will form carbon dioxide after the combustion. The oxygen and the hydrocarbon particles will form water and carbon dioxide after the combustion. The product of the combustion may be released throughscreen 102 and disposed elsewhere. Although the configuration of the apparatus in FIG. 3 provides only one chance of combustion, if the flow of the exhaust is properly adjusted, the single combustion can efficiently reduce particulate emissions. - In the case in which the chargeable device has a plurality of pairs of perforated plates such as
chargeable device 70 in FIG. 3, the combustion can occur in bothgaps gap 91 may be combusted later on ingap 92. - While the present invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains.
Claims (19)
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US10/443,372 US20040231320A1 (en) | 2003-05-22 | 2003-05-22 | Apparatus for reducing particulate emissions |
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US10/443,372 US20040231320A1 (en) | 2003-05-22 | 2003-05-22 | Apparatus for reducing particulate emissions |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US20110146234A1 (en) * | 2009-12-23 | 2011-06-23 | Caterpillar Inc. | Power system having additive injector |
CN104632322A (en) * | 2015-02-11 | 2015-05-20 | 盐城市富源油箱有限公司 | Diesel engine exhausting micro-particle filtering device |
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CN104632322A (en) * | 2015-02-11 | 2015-05-20 | 盐城市富源油箱有限公司 | Diesel engine exhausting micro-particle filtering device |
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