US20150211406A1 - After-Treatment System - Google Patents
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- US20150211406A1 US20150211406A1 US14/679,712 US201514679712A US2015211406A1 US 20150211406 A1 US20150211406 A1 US 20150211406A1 US 201514679712 A US201514679712 A US 201514679712A US 2015211406 A1 US2015211406 A1 US 2015211406A1
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
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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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
- F01N13/017—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel the purifying devices are arranged in a single housing
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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
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
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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
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/18—Methods or apparatus for fitting, inserting or repairing different elements by using quick-active type locking mechanisms, e.g. clips
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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
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/30—Removable or rechangeable blocks or cartridges, e.g. for filters
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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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/14—Plurality of outlet tubes, e.g. in parallel or with different length
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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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/16—Plurality of inlet tubes, e.g. discharging into different chambers
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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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/22—Inlet and outlet tubes being positioned on the same side of the apparatus
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/103—Oxidation catalysts for HC and CO only
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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
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49231—I.C. [internal combustion] engine making
- Y10T29/49233—Repairing, converting, servicing or salvaging
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49718—Repairing
- Y10T29/49721—Repairing with disassembling
Definitions
- This patent disclosure relates generally to an exhaust after-treatment system for reducing emissions from power systems such as large internal combustion engines and, more particularly, to a system in which individual catalysts or aftertreatment bricks may be occasionally removed and serviced.
- SCR selective catalytic reduction
- a gaseous or liquid reductant agent is introduced to the exhaust system where the reductant agent can intermix with the exhaust gasses or it can be adsorbed onto a catalyst located in the exhaust system downstream of the internal combustion engine.
- a common reductant agent is urea, though other suitable substances such as ammonia may be readily used in the SCR process.
- the NO x pollutants can react with the reductant agent and the catalyst such that the NO x is converted into nitrogen (N 2 ) and water (H 2 O).
- the catalyst used in the SCR process may include an internal support structure or substrate matrix that has been treated or coated with an active material that promotes the SCR conversion process.
- the matrix may be metal or ceramic or a combination like copper zeolite coated with a base metal like vanadium.
- multiple catalysts may be disposed in a common housing or module, such as indicated in U.S. Patent Publication No. 2009/0113709 titled “Method of Manufacturing Exhaust Aftertreatment Devices,” herein incorporated by reference in its entirety. That application describes a plurality of monolithic substrates that may be wrapped in a support mat and inserted via a soft-stuffing process into a cylindrical housing for retention.
- the active material in SCR catalysts may become depleted or may become deactivated due to other products in the exhaust gasses such as phosphorous or sulfur collecting in the catalyst.
- the substrate matrix is commonly designed as a thin-walled grid or frame that may become damaged. Accordingly, it may be necessary to occasionally remove the SCR catalysts from the exhaust system for repair or replacement.
- removal and replacement of an individual catalyst may be complicated.
- the disclosure describes, in one aspect, an aftertreatment brick for insertion into a sleeve.
- the aftertreatment brick includes a substrate matrix extending between a first face and a second face.
- a mantle is disposed around the substrate matrix.
- the mantle may extend between a first rim proximate the first face and a second rim proximate the second face.
- the mantle may further include an overhang extension extending the first rim beyond the first face.
- the aftertreatment brick can include a retrieval feature disposed on an inner surface of the overhang extension.
- the disclosure describes a method of servicing an aftertreatment module when needed.
- the aftertreatment module includes at least one longitudinal sleeve that extends between an upstream end and a downstream end along a longitudinal axis.
- the sleeve has an axially aligned opening formed at the upstream end.
- the method includes accommodating a first aftertreatment brick in the sleeve to be axially aligned along the longitudinal axis.
- the method further involves retrieving the first aftertreatment brick from the sleeve by engaging a retrieval feature on the first aftertreatment brick and removing the first SCR catalyst axially through the opening.
- an aftertreatment module including a plurality of longitudinal sleeves arranged in a bundle.
- Each of the sleeves extends between an upstream end and a downstream end along a longitudinal axis and includes an opening formed at each of the upstream ends.
- a plurality of aftertreatment bricks are axially inserted into each sleeve, including at least a first aftertreatment brick disposed toward the upstream end and a second aftertreatment brick disposed toward the downstream end.
- Each of the aftertreatment bricks includes a substrate matrix and a mantle disposed around the substrate matrix. The mantle may have an overhang extension extending beyond the substrate matrix.
- Each of the aftertreatment bricks further includes a retrieval feature disposed on the overhang extension. The retrieval feature enables retrieval of the first aftertreatment brick and the second aftertreatment brick from the sleeve axially through the opening of the upstream end.
- FIG. 1 is a side elevational view of a power system including an internal combustion engine coupled to a generator and associated with a clean emissions module.
- FIG. 2 is a perspective view of the clean emissions module with the top removed to illustrate the components inside of, and the exhaust flow through, the module.
- FIG. 3 is a perspective view of an SCR module disposed in the clean emissions module of FIG. 2 that includes at least one sleeve receiving a plurality of SCR catalysts.
- FIG. 4 is a perspective view of an embodiment of an aftertreatment brick, particularly an SCR catalyst, having a retrieval feature in the form of a slot disposed in an overhang extension of the outer mantle of the SCR catalyst with the substrate matrix of the catalyst illustrated in detail.
- FIG. 5 is a perspective view of the SCR catalyst of FIG. 4 being retrieved from the sleeve of a SCR module, depicted in dashed lines, by a retrieval tool engaged with the slot.
- FIG. 6 is a perspective view of another embodiment of a retrieval tool engaging diametrically opposing slots disposed on the SCR catalyst.
- FIG. 7 is a perspective view of another embodiment of the SCR catalyst having a retrieval feature in the form of a handle attached to brackets disposed on the overhang extension with a bracket illustrated in detail.
- FIG. 8 is a perspective view of another embodiment of the SCR catalyst having a retrieval feature in the form of a catch disposed on the circular overhang extension that is engagable with a retrieval tool.
- FIG. 1 a power system 100 that can generate power by combusting fossil fuels or the like.
- the illustrated power system 100 can include an internal combustion engine 102 such as a diesel engine operatively coupled to a generator 104 for producing electricity.
- the internal combustion engine 102 may have any number of cylinders as may be appreciated by one of ordinary skill in the art.
- the internal combustion engine 102 and the generator 104 can be supported on a common mounting frame 106 .
- the power system 100 can provide on-site stand-by power or continuous electrical power at locations where access to an electrical grid is limited or unavailable. Accordingly, the generator 104 and internal combustion engine 102 can be scaled or sized to provide suitable wattage and horsepower. It should be appreciated that in other embodiments, the power system of the present disclosure can be utilized in other applications such as gasoline burning engines, natural gas turbines, and coal burning systems. Further, in addition to stationary applications, the present disclosure can be utilized in mobile applications such as locomotives and marine engines.
- the power system can include an air introduction system 110 and an exhaust system 112 .
- the air introduction system 110 introduces air or an air/fuel mixture to the combustion chambers of the internal combustion engine 102 for combustion while the exhaust system 112 includes an exhaust pipe or exhaust channel 114 in fluid communication with the combustion chambers to direct the exhaust gasses produced by the combustion process to the environment.
- the power system 100 can include one or more turbochargers 116 operatively associated with the air introduction system 110 and the exhaust system 112 .
- the exhaust system 112 can include components to condition or treat the exhaust gasses before they are discharged to the environment.
- an exhaust after-treatment system module 120 in the form of a clean emissions module (CEM) can be disposed in fluid communication with the exhaust system 112 downstream of the turbochargers 116 to receive the exhaust gasses discharged from the internal combustion engine 102 .
- the after-treatment module 120 can be designed as a separate unit that can be mounted to the power system 100 generally over the generator 104 , for example, and can receive exhaust gasses from the exhaust channel 114 . By manufacturing the after-treatment module 120 as a separate modular unit, the design can be utilized with different sizes and configurations of the power system 100 .
- the after-treatment module 120 can be configured to treat, remove or convert regulated emissions and other constituents in the exhaust gasses.
- the after-treatment module 120 can include a box-like housing 122 that is supported on a base support 124 adapted to mount the after-treatment module to the power system.
- the box-like housing 122 can include a forward-directed first wall 126 , an opposing rearward second wall 128 , and respective third and fourth sidewalls 130 , 132 .
- terms like forward, rearward and side are used only for orientation purposes and should not be construed as a limitation on the claims.
- extending between the forward first wall 126 and rearward second wall 128 and located midway between the third and fourth sidewalls 130 , 132 can be an imaginary central module axis line 134 .
- the housing 122 may be made from welded steel plates or sheet material.
- one or more inlets 140 can be disposed through first wall 126 of the housing 122 and can be coupled in fluid communication to the exhaust channel from the exhaust system.
- the after-treatment module 120 includes two inlets 140 arranged generally in parallel and centrally located between the third and fourth sidewalls 130 , 132 on either side of the module axis line 134 so that the entering exhaust gasses are directed toward the rearward second wall 128 .
- other embodiments of the after-treatment module 120 may include different numbers and/or locations for the inlets.
- two outlets 142 can also be disposed through the first wall 126 of the housing 122 . Each outlet 142 can be parallel to the centrally oriented inlets 140 and can be disposed toward one of the respective third and fourth sidewalls 130 , 132 .
- the housing 122 can contain various types or kinds of exhaust treatment devices through or past which the exhaust gasses are directed.
- the inlets 140 can each be communicatively associated with an expanding, cone-shaped diffuser 144 mounted exteriorly of the front first wall 126 .
- Each diffuser 144 can direct the exhaust gasses to an associated diesel oxidation catalyst (DOC) 146 located proximate the first wall 126 inside the housing 122 that then directs the exhaust gasses to a common collector duct 148 centrally aligned along the module axis line 134 .
- DOCs 146 can contain materials such as platinum group metals like platinum or palladium which can catalyze carbon monoxide and hydrocarbons in the exhaust gasses to water and carbon dioxide via the following possible reactions:
- the after-treatment module may include an SCR system 150 .
- a liquid or gaseous reductant agent is introduced to the exhaust system and directed through an SCR catalyst along with the exhaust gasses.
- the SCR catalyst can include materials that cause the exhaust gasses to react with the reductant agent to convert the NO X to nitrogen (N 2 ) and water (H 2 O).
- a common reductant agent is urea ((NH 2 ) 2 CO), though other suitable substances such as ammonia (NH 3 ) can be used in the SCR process.
- the reaction may occur according to the following general formula:
- the SCR system 150 includes a reductant injector 152 located downstream of the collector duct 148 and upstream of a centrally aligned mixing duct 154 that channels the exhaust gasses toward the rearward second wall 128 of the housing 122 .
- the reductant injector 152 can be in fluid communication with a storage tank or reservoir storing the reductant agent and can periodically, or continuously, inject a measure of the reductant agent into the exhaust gas stream in a process sometimes referred to as dosing.
- the amount of reductant agent introduced can be dependent upon the NO X load of the exhaust gasses.
- the elongated mixing duct 154 uniformly intermixes the reductant agent with the exhaust gasses before they enter the downstream SCR catalysts.
- a diffuser 156 Disposed at the end of the mixing duct 154 proximate the second wall 128 can be a diffuser 156 that redirects the exhaust gas/reductant agent mixture toward the third and fourth sidewalls 130 , 132 of the after-treatment module 120 .
- the third and fourth sidewalls 130 , 132 can redirect the exhaust gas/reductant agent mixture generally back towards the front first wall 126 .
- the after-treatment module 120 can include a first SCR module 160 disposed proximate the third sidewall 130 and a second SCR module 162 disposed toward the fourth sidewall 132 .
- the first and second SCR modules 160 , 162 are oriented to receive the redirected exhaust gas/reductant agent mixture.
- the first and second SCR modules 160 , 162 can accommodate a plurality of SCR catalysts 164 , sometimes referred to as aftertreatment bricks, in one or more sleeves 166 .
- the term aftertreatment brick may refer to a variety of exhaust aftertreatment devices which SCR catalysts are a subset of.
- the sleeves 166 can be generally elongated, tubular structures having an upstream end 168 and an opposing downstream end 170 aligned along a longitudinal axis 172 .
- the sleeves can be supported in a truss or frame 174 .
- the frame 174 can be oriented so that the upstream ends 168 are directed toward the respective third and forth sidewalls 130 , 132 and the downstream ends 170 communicate with a central region 175 of the after-treatment module 120 generally surrounding but fluidly separated from the mixing duct 154 .
- the central region 175 can direct the treated exhaust gasses forward to the outlets 142 disposed through the front first wall 126 .
- one or more additional exhaust treatment devices can be disposed in the after-treatment module 120 such as diesel particulate filters 178 for removing soot.
- the upstream end 168 of each sleeve can remain open and unobstructed.
- the catalysts 164 and the sleeves 166 can have complementary cylindrical shapes, although in other embodiments it will be appreciated that the sleeves and catalysts can have other suitable complementary shapes.
- the catalysts 164 can be aligned along the longitudinal axis 172 and slidably inserted into the sleeves 166 .
- the catalysts 164 can be flow-through devices so that the exhaust gas/reductant agent mixture can pass through them.
- the insertion process can involve a first catalyst 180 and a second catalyst 182 that are inserted in such an order that the first catalyst is oriented toward the upstream end 168 and the second catalyst is oriented toward the downstream end 170 .
- a third catalyst 184 can be inserted between the upstream first catalyst 180 and the downstream second catalyst 182 .
- the catalysts may have the same or different axial lengths.
- the catalysts 164 and sleeves 166 can be adapted to form a sealing engagement with each other along at least a portion of their engaging peripheries.
- one or more circular protruding ribs 188 can protrude radially about the circumference of the catalysts 164 that can form a seal with the inner surface of the sleeves 166 .
- a removable access panel 176 can be disposed in the respective third and fourth sidewalls 130 , 132 of the housing 122 .
- the SCR catalysts may become less effective due to deposits of phosphor, sulfur, and other materials from the exhaust gasses building up on the active sites of the catalysts. Additionally, the internal structure of the catalyst might become damaged, preventing flow through it or the seal between the catalyst and the sleeve might fail allowing exhaust gasses to leak through the SCR module untreated. It may therefore become necessary to remove and replace the SCR catalysts from the SCR module. As can be appreciated from FIG. 3 , though, the orientation and order of insertion of the catalysts 164 may make retrieval of the catalysts from the sleeves difficult. For example, the second catalyst 182 may be inserted deep into the sleeve 166 from the opened upstream end 168 complicating its retrieval.
- the complementary size and shape and the sealing engagement between the first catalyst 180 and the sleeve 166 may make it difficult to grip or secure the first catalyst.
- the catalysts may be relatively heavy, for example, between 13 and 17 kilograms each, thereby further complicating their retrieval. Accordingly, the catalysts 164 can be provided with a retrieval feature that assists in their retrieval and removal from the sleeves 166 .
- the catalyst 200 can include an internal substrate matrix 210 made of a triangular lattice, honeycomb lattice, metal mesh substrate, or similar thin-walled support structure 212 onto which the catalytic material or catalytic coating 214 can be disposed.
- the support structures enable the exhaust gas/reductant agent mixture to pass into and through the catalyst.
- Any suitable material can be used for the support structure 212 including, for example, ceramics, titanium oxide, or copper zeolite.
- Catalytic coatings 214 that initiate the SCR reaction can include various types of metals such as vanadium, molybdenum and tungsten.
- the catalytic coating 214 can be deposited on the support structure 212 by any suitable method including, for example, chemical vapor deposition, adsorption, powder coating, spraying, etc.
- the substrate matrix can be made entirely from a catalytic material.
- the substrate matrix 210 has a generally cylindrical shape and extends between a first circular face 220 and a second circular face 222 to delineate a first length 224 , however, in other embodiments, different shapes can be applied to the substrate matrix, e.g., square, rectangular, etc.
- the first length may be about 7 inches long.
- a tubular mantle 230 can be generally disposed around the substrate matrix 210 .
- the tubular mantle 230 can be made of a thicker or more rigid material than the thin-walled support structure 212 , such as aluminum or steel.
- the mantle may be about 1.2 millimeters thick to provide sufficient structural rigidity to the catalyst.
- the tubular mantle 230 can have a shape complementary to that of the substrate matrix 210 which, in the illustrated embodiment, is generally cylindrical.
- the cylindrical mantle 230 can therefore extend between a first circular rim 232 and a second circular rim 234 .
- the mantle and its first and second rims can have other shapes.
- the mantle can have a second length 236 delineated between the first rim 232 and a second rim 234 that is slightly larger than the first length 224 of the substrate matrix 210 .
- the second length 236 may be approximately 8 inches.
- the mantle 230 can have an overhang extension 240 extending beyond at least the first face 220 of the substrate matrix such that the overhang extension displaces the first rim 232 a distance beyond the first face.
- the overhang extension 240 may be on the order of one inch, although the disclosure is not limited thereto.
- the overhang extension 240 curves with the circular first rim 232 and includes a cylindrical inner surface 242 extending between the first rim and the first face 220 of the substrate matrix 210 .
- the retrieval feature 250 can be located on the inner surface 242 of the overhang extension 240 , a location that is the generally accessible from outside of the first rim 232 .
- the retrieval feature 250 can be an elongated, relatively narrow slot 252 disposed along the overhang extension 240 and that can be generally located mid-way between the first rim 232 and the first face 220 of the substrate matrix 210 .
- the slot 252 can have any suitable dimensions relative to the catalyst 200 . For example, if the overhang extension 240 is approximately 1 inch in length, the slot 252 can have a width of about 0.125 inches.
- the slot 252 can extend in a radial direction about part of the circumference of the circular inner surface 242 and the arc length 256 of the slot 252 can be about 5% to 10% of the circumferential dimension of the catalyst 200 .
- the circumferential length will be approximately 44 inches and the arc length 256 of the slot can be approximately 2.2 to 4.4 inches.
- the embodiment illustrate in FIG. 4 depicts two, diametrically opposed slots 252 disposed in the overhang extension 240 , in other embodiments, any suitable number of slots can be included.
- the slots can extend completely through the overhang extension or can be partially recessed into the extension.
- the slot can be stamped or laser-cut into the mantle 230 either before or after the mantle is disposed about the substrate matrix 210 .
- Possible advantages of laser cutting include a cleaner edge, and that laser cutting is less likely to damage or deform the overhang extension, especially if the slot-forming operation is performed after the mantle has already been disposed around the substrate matrix.
- the SCR catalyst 200 can be accommodated in a sleeve 166 of the first SCR module 160 such that the overhang extension 240 is oriented toward the opened upstream end 168 of the sleeve.
- the slot 252 can engage with an appropriate retrieval tool 260 that may be inserted through the opened upstream end 168 .
- the retrieval tool 260 can be a generally L-shaped bracket with a distal hook 262 protruding at a right angle from the end of an elongated arm 264 such that the hook can be inserted or received into the slot.
- the L-shaped retrieval tool can be made from a pressed, elongated blank of sheet or plate metal. Once the retrieval tool engages the slot 252 , the catalyst 200 can be pulled from the sleeve 166 through the opened upstream end 168 .
- the retrieval tool 270 can resemble a pair of inverted forceps or tongs having first and second articulating legs 272 , 274 pivotally joined at a pivot point 276 .
- Formed at the opposing first and second distal ends 278 , 280 of the respective first and second legs 272 , 274 can be a ridge-like rib 282 .
- Handles can be formed in the opposite, proximal ends of the first and second legs 272 , 272 .
- first and second distal ends 278 , 280 Moving the handles of the first and second legs 272 , 274 together will cause the first and second distal ends 278 , 280 to move apart. Accordingly, when the first and second distal ends 278 , 280 are placed within the circumference delineated by the overhang extension 240 , the first and second distal ends can be moved apart so that the ribs 282 formed thereon can be received in and engage the diametrically opposed slots 252 .
- an SCR catalyst 300 having a retrieval feature 350 in the form of a handle 352 .
- the illustrated SCR catalyst 300 can have the same general structure as described above including a substrate matrix 310 with a protective tubular mantle 330 disposed around the substrate matrix that extends between a first rim 332 and a second rim 334 .
- the substrate matrix and mantle can have any suitable shape including cylindrical as illustrated.
- the tubular mantle 330 can include an overhang extension 340 that offsets the first rim 332 of the mantle from the forward first face 320 of the substrate matrix 310 .
- the overhang extension 340 thereby defines an accessible circumferential inner surface 342 .
- a first bracket 360 and a second bracket 362 can be disposed on the inner surface 342 of the overhang extension 340 .
- the first and second brackets 360 , 362 can be formed from stamped metal with an offset surface 364 supported between two depending bracket legs 366 and a circular hole 368 disposed through the offset surface.
- the first and second brackets 360 , 362 can be arranged generally diametrically opposed to each other.
- the first and second brackets 360 , 362 can be attached to the mantle 330 by any suitable method such as welding, riveting or with fasteners.
- an elongated rod can be bent or formed into an arch-like or curved shape including a first leg 370 and a second leg 372 with the handle therebetween at an apex 374 .
- the apex 374 may be formed as a straight grip.
- To mount the handle 352 to the catalyst 300 utilizing the first and second brackets 360 , 362 there can be formed or disposed at the opposing distal ends of first and second legs 370 , 372 a respective first and second doweled end 376 , 378 .
- the handle 352 is thereby supported across the diameter of the circular first rim 332 .
- the first and second doweled ends 376 , 378 can have a size and shape complementary to the circular holes 368 disposed in the first and second brackets 360 , 362 so that they can be insertably received into the holes.
- the first and second doweled ends 376 , 378 can form journals with the holes 368 .
- the handle 352 can be articulated so that it stands perpendicular to the SCR catalyst 300 to pull the catalyst from the sleeves.
- the curved shape of the handle 352 can be sized so that it can be set or accommodated within the circumference of the overhang extension 340 when pivoted adjacent to the first face 320 of the substrate matrix 310 . Accordingly, multiple catalysts can be aligned and stacked adjacent to each other in the sleeves without the handles interfering.
- the handle 352 can be removed from the catalyst 300 by moving or pressing the first and second legs 370 , 372 toward each other so that the first and second doweled ends 376 , 378 are removed and released from the respective holes 368 in the first and second brackets 360 , 362 .
- the handle can be selectively reattached when necessary to remove the catalyst.
- the catalyst 400 can include a substrate matrix 410 having opposing first and second faces 420 , 422 that is surrounded by a tubular mantle 430 extending between a first rim 432 and a second rim 434 .
- the mantle 430 can form an overhang extension 440 extending rearward from the first rim 432 to the first face 420 of the substrate matrix 410 .
- the retrieval feature 450 can be in the form of a pocket-like catch 452 disposed on the cylindrical inner surface 442 of the overhang extension 440 .
- a plurality of pocket-like catches 452 can be disposed about the cylindrical inner surface 442 .
- the catch 452 can protrude outward from the inner surface 442 and can define an inner pocket that is accessible via a lip 454 that is directed away from the first rim 432 and toward the first face 420 of the substrate matrix 410 .
- a retrieval tool 460 can include a hook 462 disposed at the distal end of an elongated shaft or handle 464 that can be hooked around the lip 454 and partially received in the inner pocket. Pulling the retrieval tool in a particular direction will accordingly pull the SCR catalyst in that direction.
- the present disclosure is applicable to retrieval of aftertreatment bricks or units accommodated in a large-scale after-treatment module in the event the aftertreatment bricks require servicing.
- SCR catalysts SCR catalysts
- the disclosure can relate to other suitable aftertreatment devices such as diesel oxidation catalysts (DOCs) and/or diesel particulate filters (DPFs) also sometimes referred to as bricks.
- DOCs diesel oxidation catalysts
- DPFs diesel particulate filters
- an operator can remove the access panel 176 that may be proximately facing the respective first or second SCR module 160 / 162 inside the after-treatment system 120 .
- the operator can reach through the access panel and insert the tool into the opened upstream end 168 of the elongated sleeves 166 that may be bundled together in the SCR module 160 / 162 .
- the retrieval tool can engage a retrieval feature disposed on the catalyst in any of the foregoing manners.
- the retrieval feature is a slot 252
- the retrieval tool can engage the slot and can be retracted to pull the catalyst from the sleeve 166 .
- the retrieval tool can be a hook that is inserted into the opened upstream end of the sleeves 166 to hook around the handle.
- the operator may insert his arm into the sleeves to grasp the handle with his hand.
- the disclosure is particularly suited to the retrieval of a plurality of catalysts 164 that may be accommodate in an axially aligned fashion within the same elongated sleeve 166 of the SCR module 160 / 162 .
- the second catalyst 182 located deep within the sleeve 166 toward the downstream end 170 can be satisfactorily reached with the elongated retrieval tool.
- the disclosure enables the ordered insertion and/or extraction of a plurality of SCR catalysts 164 that may be accommodated at different distances from the opened upstream end 168 of the sleeve 166 .
- FIG. 3 it will be appreciated that the second catalyst 182 located deep within the sleeve 166 toward the downstream end 170 can be satisfactorily reached with the elongated retrieval tool.
- the disclosure enables the ordered insertion and/or extraction of a plurality of SCR catalysts 164 that may be accommodated at different distances from the opened upstream end 168 of the sleeve 166
- the retrieval feature 250 is disposed on the inner surface 242 of the overhang extension 240 , it will generally not interfere with adjacent catalysts that may be axially inserted in an abutting relation in the same sleeve, even in those embodiments where the retrieval feature is a pivoting handle. Additionally, the location of the retrieval feature inside the overhang extension helps ensure that it will not interfere with the sleeve surrounding the catalyst. In certain embodiments, the retrieval tool can also assist in inserting new SCR catalysts into the sleeves for replacement purposes after the expended SCR catalysts have been removed.
Abstract
An after-treatment system includes a Selective Catalytic Reduction (SCR) catalyst or a similar aftertreatment unit or brick that may be inserted into the opened end of a sleeve. The aftertreatment brick includes a substrate matrix with catalytic material that extends between a first face and a second face. A mantle is disposed around the substrate matrix and extends between a first rim proximate the first face and a second rim proximate the second face. The mantle may include a overhang extension that extends the first rim of the mantle beyond the first face of the substrate matrix. To enable retrieval of the SCR catalyst from the sleeve, a retrieval feature is disposed on a readily accessible, inner surface of the overhang extension.
Description
- This application is a continuation of U.S. application Ser. No. 13/571,053, filed on Aug. 9, 2012.
- This patent disclosure relates generally to an exhaust after-treatment system for reducing emissions from power systems such as large internal combustion engines and, more particularly, to a system in which individual catalysts or aftertreatment bricks may be occasionally removed and serviced.
- Power systems, particularly internal combustion engines like diesel engines, gasoline engines and natural gas burning turbines, create a number of byproducts and emissions during operation including nitrogen oxide emissions such as NO and NO2, sometimes represented as NOX. In response to increased government-mandated regulations over such emissions, manufacturers of internal combustion engines have developed measures to reduce the amount or effect of the nitrogen oxides produced by the internal combustion process. One method is a chemical process called selective catalytic reduction, which may be referred to as SCR. In the SCR process, a gaseous or liquid reductant agent is introduced to the exhaust system where the reductant agent can intermix with the exhaust gasses or it can be adsorbed onto a catalyst located in the exhaust system downstream of the internal combustion engine. A common reductant agent is urea, though other suitable substances such as ammonia may be readily used in the SCR process. The NOx pollutants can react with the reductant agent and the catalyst such that the NOx is converted into nitrogen (N2) and water (H2O).
- The catalyst used in the SCR process may include an internal support structure or substrate matrix that has been treated or coated with an active material that promotes the SCR conversion process. For example, the matrix may be metal or ceramic or a combination like copper zeolite coated with a base metal like vanadium. In a large scale application, multiple catalysts may be disposed in a common housing or module, such as indicated in U.S. Patent Publication No. 2009/0113709 titled “Method of Manufacturing Exhaust Aftertreatment Devices,” herein incorporated by reference in its entirety. That application describes a plurality of monolithic substrates that may be wrapped in a support mat and inserted via a soft-stuffing process into a cylindrical housing for retention.
- Over time, the active material in SCR catalysts may become depleted or may become deactivated due to other products in the exhaust gasses such as phosphorous or sulfur collecting in the catalyst. Additionally, the substrate matrix is commonly designed as a thin-walled grid or frame that may become damaged. Accordingly, it may be necessary to occasionally remove the SCR catalysts from the exhaust system for repair or replacement. However, where multiple catalysts are included in a housing or module, especially in exhaust systems associated with large power systems, removal and replacement of an individual catalyst may be complicated.
- The disclosure describes, in one aspect, an aftertreatment brick for insertion into a sleeve. The aftertreatment brick includes a substrate matrix extending between a first face and a second face. A mantle is disposed around the substrate matrix. The mantle may extend between a first rim proximate the first face and a second rim proximate the second face. The mantle may further include an overhang extension extending the first rim beyond the first face. To enable retrieval of the aftertreatment brick from the sleeve, the aftertreatment brick can include a retrieval feature disposed on an inner surface of the overhang extension.
- In another aspect, the disclosure describes a method of servicing an aftertreatment module when needed. The aftertreatment module includes at least one longitudinal sleeve that extends between an upstream end and a downstream end along a longitudinal axis. The sleeve has an axially aligned opening formed at the upstream end. The method includes accommodating a first aftertreatment brick in the sleeve to be axially aligned along the longitudinal axis. The method further involves retrieving the first aftertreatment brick from the sleeve by engaging a retrieval feature on the first aftertreatment brick and removing the first SCR catalyst axially through the opening.
- In yet another aspect, the disclosure describes an aftertreatment module including a plurality of longitudinal sleeves arranged in a bundle. Each of the sleeves extends between an upstream end and a downstream end along a longitudinal axis and includes an opening formed at each of the upstream ends. A plurality of aftertreatment bricks are axially inserted into each sleeve, including at least a first aftertreatment brick disposed toward the upstream end and a second aftertreatment brick disposed toward the downstream end. Each of the aftertreatment bricks includes a substrate matrix and a mantle disposed around the substrate matrix. The mantle may have an overhang extension extending beyond the substrate matrix. Each of the aftertreatment bricks further includes a retrieval feature disposed on the overhang extension. The retrieval feature enables retrieval of the first aftertreatment brick and the second aftertreatment brick from the sleeve axially through the opening of the upstream end.
-
FIG. 1 is a side elevational view of a power system including an internal combustion engine coupled to a generator and associated with a clean emissions module. -
FIG. 2 is a perspective view of the clean emissions module with the top removed to illustrate the components inside of, and the exhaust flow through, the module. -
FIG. 3 is a perspective view of an SCR module disposed in the clean emissions module ofFIG. 2 that includes at least one sleeve receiving a plurality of SCR catalysts. -
FIG. 4 is a perspective view of an embodiment of an aftertreatment brick, particularly an SCR catalyst, having a retrieval feature in the form of a slot disposed in an overhang extension of the outer mantle of the SCR catalyst with the substrate matrix of the catalyst illustrated in detail. -
FIG. 5 is a perspective view of the SCR catalyst ofFIG. 4 being retrieved from the sleeve of a SCR module, depicted in dashed lines, by a retrieval tool engaged with the slot. -
FIG. 6 is a perspective view of another embodiment of a retrieval tool engaging diametrically opposing slots disposed on the SCR catalyst. -
FIG. 7 is a perspective view of another embodiment of the SCR catalyst having a retrieval feature in the form of a handle attached to brackets disposed on the overhang extension with a bracket illustrated in detail. -
FIG. 8 is a perspective view of another embodiment of the SCR catalyst having a retrieval feature in the form of a catch disposed on the circular overhang extension that is engagable with a retrieval tool. - This disclosure relates generally to an exhaust after-treatment system and more particularly to catalysts for selective catalytic reduction (SCR) that are adapted to be retrieved from such systems. Now referring to the drawings, wherein like reference numbers refer to like elements, there is illustrated in
FIG. 1 apower system 100 that can generate power by combusting fossil fuels or the like. The illustratedpower system 100 can include aninternal combustion engine 102 such as a diesel engine operatively coupled to agenerator 104 for producing electricity. Theinternal combustion engine 102 may have any number of cylinders as may be appreciated by one of ordinary skill in the art. Theinternal combustion engine 102 and thegenerator 104 can be supported on acommon mounting frame 106. Thepower system 100 can provide on-site stand-by power or continuous electrical power at locations where access to an electrical grid is limited or unavailable. Accordingly, thegenerator 104 andinternal combustion engine 102 can be scaled or sized to provide suitable wattage and horsepower. It should be appreciated that in other embodiments, the power system of the present disclosure can be utilized in other applications such as gasoline burning engines, natural gas turbines, and coal burning systems. Further, in addition to stationary applications, the present disclosure can be utilized in mobile applications such as locomotives and marine engines. - To direct intake air into and exhaust gasses from the
power system 100, the power system can include anair introduction system 110 and anexhaust system 112. Theair introduction system 110 introduces air or an air/fuel mixture to the combustion chambers of theinternal combustion engine 102 for combustion while theexhaust system 112 includes an exhaust pipe orexhaust channel 114 in fluid communication with the combustion chambers to direct the exhaust gasses produced by the combustion process to the environment. To pressurize intake air by utilizing the positive pressure of the expelled exhaust gasses, thepower system 100 can include one ormore turbochargers 116 operatively associated with theair introduction system 110 and theexhaust system 112. - The
exhaust system 112 can include components to condition or treat the exhaust gasses before they are discharged to the environment. For example, an exhaust after-treatment system module 120 in the form of a clean emissions module (CEM) can be disposed in fluid communication with theexhaust system 112 downstream of theturbochargers 116 to receive the exhaust gasses discharged from theinternal combustion engine 102. The after-treatment module 120 can be designed as a separate unit that can be mounted to thepower system 100 generally over thegenerator 104, for example, and can receive exhaust gasses from theexhaust channel 114. By manufacturing the after-treatment module 120 as a separate modular unit, the design can be utilized with different sizes and configurations of thepower system 100. The after-treatment module 120 can be configured to treat, remove or convert regulated emissions and other constituents in the exhaust gasses. - Referring to
FIG. 2 , the after-treatment module 120 can include a box-like housing 122 that is supported on abase support 124 adapted to mount the after-treatment module to the power system. The box-like housing 122 can include a forward-directedfirst wall 126, an opposing rearwardsecond wall 128, and respective third andfourth sidewalls first wall 126 and rearwardsecond wall 128 and located midway between the third andfourth sidewalls module axis line 134. Thehousing 122 may be made from welded steel plates or sheet material. - To receive the untreated exhaust gasses into the after-
treatment module 120, one ormore inlets 140 can be disposed throughfirst wall 126 of thehousing 122 and can be coupled in fluid communication to the exhaust channel from the exhaust system. In the embodiment illustrated, the after-treatment module 120 includes twoinlets 140 arranged generally in parallel and centrally located between the third andfourth sidewalls module axis line 134 so that the entering exhaust gasses are directed toward the rearwardsecond wall 128. However, other embodiments of the after-treatment module 120 may include different numbers and/or locations for the inlets. To enable the exhaust gasses to exit the after-treatment module 120, twooutlets 142 can also be disposed through thefirst wall 126 of thehousing 122. Eachoutlet 142 can be parallel to the centrally orientedinlets 140 and can be disposed toward one of the respective third andfourth sidewalls - To treat or condition the exhaust gasses, the
housing 122 can contain various types or kinds of exhaust treatment devices through or past which the exhaust gasses are directed. For example and following the arrows indicating exhaust flow through the after-treatment module 120, in order to slow the velocity of the incoming exhaust gasses for treatment, theinlets 140 can each be communicatively associated with an expanding, cone-shapeddiffuser 144 mounted exteriorly of the frontfirst wall 126. Eachdiffuser 144 can direct the exhaust gasses to an associated diesel oxidation catalyst (DOC) 146 located proximate thefirst wall 126 inside thehousing 122 that then directs the exhaust gasses to a common collector duct 148 centrally aligned along themodule axis line 134. TheDOCs 146 can contain materials such as platinum group metals like platinum or palladium which can catalyze carbon monoxide and hydrocarbons in the exhaust gasses to water and carbon dioxide via the following possible reactions: -
CO+½O2=CO2 (1) -
[HC]+O2=CO2+H2O (2) - To further reduce emissions in the exhaust gasses and particularly to reduce nitrogen oxides such as NO and NO2, sometimes referred to as NOX, the after-treatment module may include an
SCR system 150. In the SCR process, a liquid or gaseous reductant agent is introduced to the exhaust system and directed through an SCR catalyst along with the exhaust gasses. The SCR catalyst can include materials that cause the exhaust gasses to react with the reductant agent to convert the NOX to nitrogen (N2) and water (H2O). A common reductant agent is urea ((NH2)2CO), though other suitable substances such as ammonia (NH3) can be used in the SCR process. The reaction may occur according to the following general formula: -
NH3+NOX=N2+H2O (3) - Referring to
FIG. 2 , to introduce the reductant agent, theSCR system 150 includes a reductant injector 152 located downstream of the collector duct 148 and upstream of a centrally aligned mixingduct 154 that channels the exhaust gasses toward the rearwardsecond wall 128 of thehousing 122. The reductant injector 152 can be in fluid communication with a storage tank or reservoir storing the reductant agent and can periodically, or continuously, inject a measure of the reductant agent into the exhaust gas stream in a process sometimes referred to as dosing. The amount of reductant agent introduced can be dependent upon the NOX load of the exhaust gasses. Theelongated mixing duct 154 uniformly intermixes the reductant agent with the exhaust gasses before they enter the downstream SCR catalysts. Disposed at the end of the mixingduct 154 proximate thesecond wall 128 can be adiffuser 156 that redirects the exhaust gas/reductant agent mixture toward the third andfourth sidewalls treatment module 120. The third andfourth sidewalls first wall 126. - To perform the SCR reaction process, the after-
treatment module 120 can include afirst SCR module 160 disposed proximate thethird sidewall 130 and asecond SCR module 162 disposed toward thefourth sidewall 132. The first andsecond SCR modules FIGS. 2 and 3, the first andsecond SCR modules SCR catalysts 164, sometimes referred to as aftertreatment bricks, in one ormore sleeves 166. The term aftertreatment brick, however, may refer to a variety of exhaust aftertreatment devices which SCR catalysts are a subset of. Thesleeves 166 can be generally elongated, tubular structures having anupstream end 168 and an opposingdownstream end 170 aligned along alongitudinal axis 172. In those embodiments that include more than one sleeve in the first andsecond SCR modules central region 175 of the after-treatment module 120 generally surrounding but fluidly separated from the mixingduct 154. Thecentral region 175 can direct the treated exhaust gasses forward to theoutlets 142 disposed through the frontfirst wall 126. In various embodiments, one or more additional exhaust treatment devices can be disposed in the after-treatment module 120 such as diesel particulate filters 178 for removing soot. - Referring to
FIG. 3 , to receive theSCR catalysts 164 in thesleeves 166, theupstream end 168 of each sleeve can remain open and unobstructed. As shown in the illustrated embodiment, thecatalysts 164 and thesleeves 166 can have complementary cylindrical shapes, although in other embodiments it will be appreciated that the sleeves and catalysts can have other suitable complementary shapes. Thecatalysts 164 can be aligned along thelongitudinal axis 172 and slidably inserted into thesleeves 166. Thecatalysts 164 can be flow-through devices so that the exhaust gas/reductant agent mixture can pass through them. In those embodiments in which a plurality ofcatalysts 164 are accommodated per eachsleeve 166, the insertion process can involve afirst catalyst 180 and asecond catalyst 182 that are inserted in such an order that the first catalyst is oriented toward theupstream end 168 and the second catalyst is oriented toward thedownstream end 170. In the illustrated embodiment, athird catalyst 184 can be inserted between the upstreamfirst catalyst 180 and the downstreamsecond catalyst 182. The catalysts may have the same or different axial lengths. - To facilitate insertion and removal of the catalysts a 2-3 millimeter gap may exist between portions of the
catalysts 164 and the sleeve. Further, to prevent leakage of the exhaust gas/reductant agent mixture through the SCR module, thecatalysts 164 andsleeves 166 can be adapted to form a sealing engagement with each other along at least a portion of their engaging peripheries. For example, one or more circularprotruding ribs 188 can protrude radially about the circumference of thecatalysts 164 that can form a seal with the inner surface of thesleeves 166. To access theSCR modules catalysts 164, aremovable access panel 176 can be disposed in the respective third andfourth sidewalls housing 122. - As mentioned above, over time the SCR catalysts may become less effective due to deposits of phosphor, sulfur, and other materials from the exhaust gasses building up on the active sites of the catalysts. Additionally, the internal structure of the catalyst might become damaged, preventing flow through it or the seal between the catalyst and the sleeve might fail allowing exhaust gasses to leak through the SCR module untreated. It may therefore become necessary to remove and replace the SCR catalysts from the SCR module. As can be appreciated from
FIG. 3 , though, the orientation and order of insertion of thecatalysts 164 may make retrieval of the catalysts from the sleeves difficult. For example, thesecond catalyst 182 may be inserted deep into thesleeve 166 from the openedupstream end 168 complicating its retrieval. Likewise, the complementary size and shape and the sealing engagement between thefirst catalyst 180 and thesleeve 166 may make it difficult to grip or secure the first catalyst. In some embodiments, the catalysts may be relatively heavy, for example, between 13 and 17 kilograms each, thereby further complicating their retrieval. Accordingly, thecatalysts 164 can be provided with a retrieval feature that assists in their retrieval and removal from thesleeves 166. - Referring to
FIG. 4 , there is illustrated an embodiment of anSCR catalyst 200 of the type for use with the described SCR module that incorporates a retrieval feature to assist in removing the catalyst from thesleeve 166. To support the catalytic material, thecatalyst 200 can include aninternal substrate matrix 210 made of a triangular lattice, honeycomb lattice, metal mesh substrate, or similar thin-walled support structure 212 onto which the catalytic material orcatalytic coating 214 can be disposed. Such designs for the support structures enable the exhaust gas/reductant agent mixture to pass into and through the catalyst. Any suitable material can be used for thesupport structure 212 including, for example, ceramics, titanium oxide, or copper zeolite.Catalytic coatings 214 that initiate the SCR reaction can include various types of metals such as vanadium, molybdenum and tungsten. Thecatalytic coating 214 can be deposited on thesupport structure 212 by any suitable method including, for example, chemical vapor deposition, adsorption, powder coating, spraying, etc. In other embodiments, instead of having separate support structures and catalytic coatings that are often employed together to reduce material costs, the substrate matrix can be made entirely from a catalytic material. In the illustrated embodiment, thesubstrate matrix 210 has a generally cylindrical shape and extends between a firstcircular face 220 and a secondcircular face 222 to delineate afirst length 224, however, in other embodiments, different shapes can be applied to the substrate matrix, e.g., square, rectangular, etc. By way of example only, the first length may be about 7 inches long. - To protect the
support structure 212, atubular mantle 230 can be generally disposed around thesubstrate matrix 210. Thetubular mantle 230 can be made of a thicker or more rigid material than the thin-walled support structure 212, such as aluminum or steel. For example, the mantle may be about 1.2 millimeters thick to provide sufficient structural rigidity to the catalyst. Thetubular mantle 230 can have a shape complementary to that of thesubstrate matrix 210 which, in the illustrated embodiment, is generally cylindrical. Thecylindrical mantle 230 can therefore extend between a firstcircular rim 232 and a secondcircular rim 234. However, in other embodiments the mantle and its first and second rims can have other shapes. The mantle can have asecond length 236 delineated between thefirst rim 232 and asecond rim 234 that is slightly larger than thefirst length 224 of thesubstrate matrix 210. By way of example only, thesecond length 236 may be approximately 8 inches. Accordingly, when disposed around theshorter substrate matrix 210, themantle 230 can have anoverhang extension 240 extending beyond at least thefirst face 220 of the substrate matrix such that the overhang extension displaces the first rim 232 a distance beyond the first face. For the examples given above, theoverhang extension 240 may be on the order of one inch, although the disclosure is not limited thereto. In the illustrated embodiment, theoverhang extension 240 curves with the circularfirst rim 232 and includes a cylindricalinner surface 242 extending between the first rim and thefirst face 220 of thesubstrate matrix 210. - To facilitate retrieval of the illustrated embodiment of the
catalyst 200 from the sleeves of the SCR module, the retrieval feature 250 can be located on theinner surface 242 of theoverhang extension 240, a location that is the generally accessible from outside of thefirst rim 232. In the illustrated embodiment, the retrieval feature 250 can be an elongated, relativelynarrow slot 252 disposed along theoverhang extension 240 and that can be generally located mid-way between thefirst rim 232 and thefirst face 220 of thesubstrate matrix 210. Theslot 252 can have any suitable dimensions relative to thecatalyst 200. For example, if theoverhang extension 240 is approximately 1 inch in length, theslot 252 can have a width of about 0.125 inches. Theslot 252 can extend in a radial direction about part of the circumference of the circularinner surface 242 and thearc length 256 of theslot 252 can be about 5% to 10% of the circumferential dimension of thecatalyst 200. For example, if thecatalyst 200 has a diameter indicated byarrow 254 of about 14 inches, the circumferential length will be approximately 44 inches and thearc length 256 of the slot can be approximately 2.2 to 4.4 inches. Moreover, although the embodiment illustrate inFIG. 4 depicts two, diametricallyopposed slots 252 disposed in theoverhang extension 240, in other embodiments, any suitable number of slots can be included. The slots can extend completely through the overhang extension or can be partially recessed into the extension. To form theslot 252, in various embodiments, the slot can be stamped or laser-cut into themantle 230 either before or after the mantle is disposed about thesubstrate matrix 210. Possible advantages of laser cutting include a cleaner edge, and that laser cutting is less likely to damage or deform the overhang extension, especially if the slot-forming operation is performed after the mantle has already been disposed around the substrate matrix. - Referring to
FIG. 5 , theSCR catalyst 200 can be accommodated in asleeve 166 of thefirst SCR module 160 such that theoverhang extension 240 is oriented toward the openedupstream end 168 of the sleeve. To retrieve theSCR catalyst 200 from within thesleeve 166, theslot 252 can engage with anappropriate retrieval tool 260 that may be inserted through the openedupstream end 168. To engage theslot 252, theretrieval tool 260 can be a generally L-shaped bracket with adistal hook 262 protruding at a right angle from the end of anelongated arm 264 such that the hook can be inserted or received into the slot. The L-shaped retrieval tool can be made from a pressed, elongated blank of sheet or plate metal. Once the retrieval tool engages theslot 252, thecatalyst 200 can be pulled from thesleeve 166 through the openedupstream end 168. - Referring to
FIG. 6 , there is illustrated another embodiment of aretrieval tool 270 that can engage with diametricallyopposed slots 252 disposed on theSCR catalyst 200. In this embodiment, theretrieval tool 270 can resemble a pair of inverted forceps or tongs having first and second articulatinglegs pivot point 276. Formed at the opposing first and second distal ends 278, 280 of the respective first andsecond legs like rib 282. Handles can be formed in the opposite, proximal ends of the first andsecond legs second legs overhang extension 240, the first and second distal ends can be moved apart so that theribs 282 formed thereon can be received in and engage the diametricallyopposed slots 252. - Referring to
FIG. 7 , there is illustrated another embodiment of anSCR catalyst 300 having a retrieval feature 350 in the form of a handle 352. The illustratedSCR catalyst 300 can have the same general structure as described above including asubstrate matrix 310 with a protectivetubular mantle 330 disposed around the substrate matrix that extends between afirst rim 332 and asecond rim 334. The substrate matrix and mantle can have any suitable shape including cylindrical as illustrated. Thetubular mantle 330 can include anoverhang extension 340 that offsets thefirst rim 332 of the mantle from the forwardfirst face 320 of thesubstrate matrix 310. Theoverhang extension 340 thereby defines an accessible circumferentialinner surface 342. To attach the handle 352 to the catalyst, afirst bracket 360 and asecond bracket 362 can be disposed on theinner surface 342 of theoverhang extension 340. Referring to the detailed view, the first andsecond brackets surface 364 supported between two dependingbracket legs 366 and acircular hole 368 disposed through the offset surface. When attached to theinner surface 342 of theoverhang extension 340, the first andsecond brackets second brackets mantle 330 by any suitable method such as welding, riveting or with fasteners. - To form the handle 352, an elongated rod can be bent or formed into an arch-like or curved shape including a
first leg 370 and asecond leg 372 with the handle therebetween at an apex 374. In the illustrated embodiment, the apex 374 may be formed as a straight grip. To mount the handle 352 to thecatalyst 300 utilizing the first andsecond brackets second legs 370, 372 a respective first and seconddoweled end first rim 332. The first and second doweled ends 376, 378 can have a size and shape complementary to thecircular holes 368 disposed in the first andsecond brackets - In an embodiment, to pivot or articulate the handle 352 with respect to the
catalyst 300, the first and second doweled ends 376, 378 can form journals with theholes 368. As illustrated inFIG. 7 , the handle 352 can be articulated so that it stands perpendicular to theSCR catalyst 300 to pull the catalyst from the sleeves. Further, the curved shape of the handle 352 can be sized so that it can be set or accommodated within the circumference of theoverhang extension 340 when pivoted adjacent to thefirst face 320 of thesubstrate matrix 310. Accordingly, multiple catalysts can be aligned and stacked adjacent to each other in the sleeves without the handles interfering. In another embodiment, to obtain the same benefit, the handle 352 can be removed from thecatalyst 300 by moving or pressing the first andsecond legs respective holes 368 in the first andsecond brackets - Referring to
FIG. 8 , there is illustrated another embodiment of theSCR catalyst 400 equipped with a variation of the retrieval feature 450 for retrieving the catalyst from the sleeve of an SCR module. Thecatalyst 400 can include asubstrate matrix 410 having opposing first andsecond faces tubular mantle 430 extending between afirst rim 432 and asecond rim 434. Themantle 430 can form anoverhang extension 440 extending rearward from thefirst rim 432 to thefirst face 420 of thesubstrate matrix 410. The retrieval feature 450 can be in the form of a pocket-like catch 452 disposed on the cylindricalinner surface 442 of theoverhang extension 440. In various embodiments, a plurality of pocket-like catches 452 can be disposed about the cylindricalinner surface 442. The catch 452 can protrude outward from theinner surface 442 and can define an inner pocket that is accessible via alip 454 that is directed away from thefirst rim 432 and toward thefirst face 420 of thesubstrate matrix 410. To engage the catch 452, aretrieval tool 460 can include ahook 462 disposed at the distal end of an elongated shaft or handle 464 that can be hooked around thelip 454 and partially received in the inner pocket. Pulling the retrieval tool in a particular direction will accordingly pull the SCR catalyst in that direction. - The present disclosure is applicable to retrieval of aftertreatment bricks or units accommodated in a large-scale after-treatment module in the event the aftertreatment bricks require servicing. Although the disclosure describes SCR catalysts in particular, the disclosure can relate to other suitable aftertreatment devices such as diesel oxidation catalysts (DOCs) and/or diesel particulate filters (DPFs) also sometimes referred to as bricks. Referring back to
FIGS. 2 and 3 , to access the catalysts, an operator can remove theaccess panel 176 that may be proximately facing the respective first orsecond SCR module 160/162 inside the after-treatment system 120. Using an elongated tool, the operator can reach through the access panel and insert the tool into the openedupstream end 168 of theelongated sleeves 166 that may be bundled together in theSCR module 160/162. The retrieval tool can engage a retrieval feature disposed on the catalyst in any of the foregoing manners. For example, in the embodiment where the retrieval feature is aslot 252, the retrieval tool can engage the slot and can be retracted to pull the catalyst from thesleeve 166. In those embodiments in which the retrieval feature is a handle, the retrieval tool can be a hook that is inserted into the opened upstream end of thesleeves 166 to hook around the handle. Alternatively, the operator may insert his arm into the sleeves to grasp the handle with his hand. - The disclosure is particularly suited to the retrieval of a plurality of
catalysts 164 that may be accommodate in an axially aligned fashion within the sameelongated sleeve 166 of theSCR module 160/162. Referring toFIG. 3 , it will be appreciated that thesecond catalyst 182 located deep within thesleeve 166 toward thedownstream end 170 can be satisfactorily reached with the elongated retrieval tool. Accordingly, the disclosure enables the ordered insertion and/or extraction of a plurality ofSCR catalysts 164 that may be accommodated at different distances from the openedupstream end 168 of thesleeve 166. Moreover, referring toFIG. 4 for example, because the retrieval feature 250 is disposed on theinner surface 242 of theoverhang extension 240, it will generally not interfere with adjacent catalysts that may be axially inserted in an abutting relation in the same sleeve, even in those embodiments where the retrieval feature is a pivoting handle. Additionally, the location of the retrieval feature inside the overhang extension helps ensure that it will not interfere with the sleeve surrounding the catalyst. In certain embodiments, the retrieval tool can also assist in inserting new SCR catalysts into the sleeves for replacement purposes after the expended SCR catalysts have been removed. - It will be appreciated that the foregoing description provides examples of the disclosed system and technique. However, it is contemplated that other implementations of the disclosure may differ in detail from the foregoing examples. All references to the disclosure or examples thereof are intended to reference the particular example being discussed at that point and are not intended to imply any limitation as to the scope of the disclosure more generally. All language of distinction and disparagement with respect to certain features is intended to indicate a lack of preference for those features, but not to exclude such from the scope of the disclosure entirely unless otherwise indicated.
- Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context.
Claims (18)
1. An aftertreatment brick for removable insertion into a sleeve disposed in an aftertreatment module, the aftertreatment brick configured as a flow-through device and further comprising:
a substrate matrix extending between a first face and an opposed second face, the substrate matrix configured as a flow-through device for the catalytic conversion of exhaust gases flowing from the first face to the second face;
a tubular mantle disposed around the substrate matrix, the mantle extending between an open first rim proximate the first face and an open second rim proximate the second face, the mantle including an overhang extension extending the first rim beyond the first face; and
a retrieval feature disposed on an inner surface of the overhang extension, the retrieval feature enabling retrieval of the aftertreatment brick from the sleeve.
2. The aftertreatment brick of claim 1 , wherein the substrate matrix is cylindrical and the first face and the second face are circular; and wherein the tubular mantle is disposed around the cylindrical substrate matrix so that the first rim and the second rim are circular.
3. The aftertreatment brick of claim 2 , wherein the retrieval feature is a slot radially disposed in the inner surface of the overhang extension of the tubular mantle, the slot adapted to engage a retrieval tool enabling retrieval of the aftertreatment brick from the sleeve.
4. The aftertreatment brick of claim 3 , wherein the slot is an elongated and narrow slot radially disposed in the overhang extension between the first face of the substrate matrix and the first rim of the mantle.
5. The aftertreatment brick of claim 2 , where the retrieval feature includes a first slot and a second slot each radially disposed into the inner surface of the overhang extension and diametrically opposed to each other.
6. The aftertreatment brick of claim 5 , wherein the retrieval tool is an inverted tong having a first leg and a second leg pivotally joined together to articulate with respect to each other, the retrieval tool further including a first rib formed at a first distal end of the first leg and a second rib formed at a second distal end of the second leg, the first and second ribs configured to be received in the respective first and second slots when the first and second legs are articulated.
7. The aftertreatment brick of claim 3 , wherein the slot is laser-cut completely through the overhang extension.
8. The aftertreatment brick of claim 2 , wherein the retrieval feature includes a pocket-like catch disposed on and protruding radially inward from the inner surface of the overhang extension, the pocket-like catch defining an inner pocket directed away from the first rim.
9. The aftertreatment brick of claim 8 , wherein the pocket-like catch is configured to receive in the inner pocket a hook-like catch disposed on a retrieval tool inserted in the first rim.
10. The aftertreatment brick of claim 2 , wherein the substrate matrix is a thin-walled lattice, honeycombed, or meshed structure and the tubular mantle is a relatively thicker sheet metal material.
11. A method of servicing an aftertreatment module comprising:
providing an aftertreatment module including at least one sleeve extending between an upstream end and a downstream end along a longitudinal axis, the at least one sleeve including an axially aligned opening formed at the upstream end;
providing a first aftertreatment brick including:
(i) a substrate matrix configured for catalytic conversion of exhaust gasses and configured as a flow-through device between a first face and an opposing second face,
(ii) a tubular mantle disposed around the substrate matrix and extending between an opened first rim proximate the first face and an opened second rim proximate the second face, the tubular mantle including an overhang extension extending the first rim beyond the first face, and
(iii) a retrieval feature disposed on an inner surface of the overhang extension;
accommodating the first aftertreatment brick in the at least one sleeve, the first aftertreatment brick axially aligned along the longitudinal axis; and
retrieving the first aftertreatment brick from the at least one sleeve by engaging the retrieval feature and removing the first aftertreatment brick through the opening of the at least one sleeve.
12. The method of claim 11 , wherein the retrieval feature is a slot radially disposed in the inner surface of the overhang extension between the first face of the substrate matrix and the first rim of the tubular mantle.
13. The method of claim 12 , wherein the step of retrieving includes receiving a retrieval tool into the slot to pull the first aftertreatment brick from the at least one sleeve.
14. The method of claim 11 , wherein the retrieval feature includes a first slot and a second slot radially disposed into the inner surface of the overhang extension between the first face and the first rim, the first slot and the second slot diametrically opposed to each other.
15. The method of claim 14 , further comprising providing a retrieval tool in the form of a inverted tong including a first leg and a second leg pivotally joined to articulate with respect to each other, the first leg including a first rib at a first distal end and the second leg including a second rib at a second distal end.
16. The method of claim 15 , wherein the step of retrieving includes inserting the retrieval tool into the first rim and articulating the first and second legs to engage the first and second ribs with the respective first and second slots radially disposed in the overhang extension.
17. The method of claim 11 , wherein the retrieval feature includes a pocket-like catch disposed onto an inner surface of the overhang extension between the first face and the first rim, the pocket-like catch defining an inner pocket directed away from the first rim.
18. The method of claim 17 , wherein the step of retrieving includes inserting a hook-like retrieval tool into the first rim and engaging the hook-like retrieval tool with the pocket-like catch.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US14/679,712 US20150211406A1 (en) | 2012-08-09 | 2015-04-06 | After-Treatment System |
Applications Claiming Priority (2)
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US13/571,053 US9011782B2 (en) | 2012-08-09 | 2012-08-09 | After-treatment system |
US14/679,712 US20150211406A1 (en) | 2012-08-09 | 2015-04-06 | After-Treatment System |
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US13/571,053 Continuation US9011782B2 (en) | 2012-08-09 | 2012-08-09 | After-treatment system |
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US20150211406A1 true US20150211406A1 (en) | 2015-07-30 |
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CN (1) | CN103573372B (en) |
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US9200554B2 (en) * | 2013-03-15 | 2015-12-01 | Clean Train Propulsion | Hybrid systems for locomotives |
US9662968B2 (en) * | 2014-02-14 | 2017-05-30 | Cnh Industrial America Llc | Mounting assembly for a diesel oxidation catalyst system of a work vehicle |
WO2015127611A1 (en) * | 2014-02-27 | 2015-09-03 | Tenneco Automotive Operating Company Inc. | Cylindrical scr substrate mounting arrangement |
DE102014005303A1 (en) * | 2014-04-10 | 2015-10-15 | Mtu Friedrichshafen Gmbh | Exhaust after-treatment device for an exhaust system of an internal combustion engine |
DE102015207565B4 (en) * | 2015-04-24 | 2020-06-18 | Robert Bosch Gmbh | Filter element, liquid filter and arrangement |
US10036294B2 (en) | 2015-05-28 | 2018-07-31 | Caterpillar Inc. | Aftertreatment module with reduced bypass flow |
US9844754B2 (en) | 2015-06-19 | 2017-12-19 | Cummins Emission Solutions Inc. | Aftertreatment system with access panel |
US20160108790A1 (en) * | 2015-12-29 | 2016-04-21 | Caterpillar Inc. | Waste heat recovery system of engine |
DE102016205316A1 (en) * | 2016-03-31 | 2017-10-05 | Man Diesel & Turbo Se | Catalyst unit and catalytic converter |
DE102016223456B4 (en) * | 2016-11-25 | 2018-11-08 | Robert Bosch Gmbh | Disassembly tool for a filter insert of a liquid filter |
US10731536B1 (en) | 2019-03-20 | 2020-08-04 | Caterpillar Inc. | Exhaust gas aftertreatment system |
DE102019108091B4 (en) * | 2019-03-28 | 2021-10-28 | Man Energy Solutions Se | SCR catalytic converter, exhaust aftertreatment system and internal combustion engine |
SE1950495A1 (en) * | 2019-04-23 | 2020-09-29 | Scania Cv Ab | An emissions control device comprising a threaded disassembling element |
CN114961932B (en) * | 2022-05-09 | 2023-12-15 | 潍柴动力股份有限公司 | Temperature control system and method for bushing type SCR device |
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NL7302006A (en) | 1972-02-29 | 1973-08-31 | ||
GB1453439A (en) | 1973-01-13 | 1976-10-20 | Ti Silencer Services Ltd | Catalytic reactor for exhaust emission control |
IT1251547B (en) | 1991-09-04 | 1995-05-17 | Gavoni Bgm Silenziatori Sas | Silencer combined with catalytic converter for internal combustion engine |
JPH06182224A (en) * | 1992-09-18 | 1994-07-05 | Nippondenso Co Ltd | Self heat-generation type honeycomb filter |
FI98403C (en) | 1994-07-01 | 1997-06-10 | Waertsilae Diesel Int | Method of operating the silencer unit and system for applying the method to a large diesel engine |
DE19810360C1 (en) * | 1998-03-10 | 1999-09-09 | Gen Motors Corp | Catalytic converter for a vehicle exhaust |
US6484397B1 (en) | 2000-07-11 | 2002-11-26 | Corning Incorporated | Method of assembling a catalytic converter for use in an internal combustion engine |
US6780292B2 (en) | 2001-04-11 | 2004-08-24 | Raintech International, Inc. | Electrolytic treatment apparatus having replaceable and interchangeable electrode reactor cartridges therefor |
US7404254B2 (en) | 2002-04-18 | 2008-07-29 | Emitec Gesellschaft Fuer Emissions Technologie Mbh | Calibrated catalyst carrier body with corrugated casing and method for manufacturing the same |
KR20050121668A (en) * | 2003-04-28 | 2005-12-27 | 마이크롤리스 코포레이션 | Filter element-removing jig |
US7565743B2 (en) | 2005-04-14 | 2009-07-28 | Catacel Corp. | Method for insertion and removal of a catalytic reactor cartridge |
DE102005045535A1 (en) | 2005-09-23 | 2007-03-29 | Arvinmeritor Emissions Technologies Gmbh | Housing for e.g. exhaust gas purifying device, has mantle including clamping section, and connection section attached in changeover section in axial direction, where connection section has diameter larger than that of clamping section |
US7517380B2 (en) | 2006-01-26 | 2009-04-14 | Fleetguard, Inc. | Serviceable aligned exhaust aftertreatment assembly |
US20090113709A1 (en) | 2007-11-07 | 2009-05-07 | Eberspaecher North America, Inc. | Method of manufacturing exhaust aftertreatment devices |
DE102008004435B4 (en) | 2008-01-15 | 2017-04-06 | Mtu Friedrichshafen Gmbh | Exhaust gas component and manufacturing method for this |
US8167966B2 (en) | 2008-04-07 | 2012-05-01 | Cummins Filtration Ip, Inc. | Replaceable filter cartridge with removal feature |
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2012
- 2012-08-09 US US13/571,053 patent/US9011782B2/en active Active
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2013
- 2013-07-25 DE DE201310012336 patent/DE102013012336A1/en active Pending
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CN103573372A (en) | 2014-02-12 |
US20140044612A1 (en) | 2014-02-13 |
US9011782B2 (en) | 2015-04-21 |
DE102013012336A1 (en) | 2014-02-13 |
CN103573372B (en) | 2018-04-20 |
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