US20150023843A1 - Reductant supply system - Google Patents
Reductant supply system Download PDFInfo
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- US20150023843A1 US20150023843A1 US14/510,141 US201414510141A US2015023843A1 US 20150023843 A1 US20150023843 A1 US 20150023843A1 US 201414510141 A US201414510141 A US 201414510141A US 2015023843 A1 US2015023843 A1 US 2015023843A1
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- Prior art keywords
- reductant
- assembly
- tank
- supply system
- pump
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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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- 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
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
-
- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- 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]
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1426—Filtration means
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
An aftertreatment system is disclosed. The aftertreatment system includes an exhaust conduit and a selective catalytic reduction module. The aftertreatment system also includes a reductant supply system. The reductant supply system includes a reductant tank, a reductant injector, and a pump assembly. The pump assembly includes a reversing valve assembly and a pump unit. The pump assembly also includes a plurality of check valves, a pressure sensor, and a filter. Further, the reductant supply system includes a back flow valve assembly. The reductant supply system also includes at least two header units associated with the pump assembly. The at least two header units include a reductant draw conduit and at least one heat exchanger. The at least two header units also include a bag filtration assembly.
Description
- The present disclosure relates to an aftertreatment system, and more particularly to a reductant supply system for the aftertreatment system.
- An aftertreatment system is associated with an engine system. The aftertreatment system is configured to treat and reduce NOx and/or other compounds of the emissions present in an exhaust gas flow, prior to the exhaust gas flow exiting into the atmosphere. In order to reduce NOx, the aftertreatment system may include a Selective Catalytic Reduction (SCR) module and a reductant delivery module.
- The reductant delivery module may include a tank for storing a reductant, a pump unit, reductant delivery lines, and a reductant injector. The reductant from the reductant tank may be delivered to the reductant injector via the pump unit. For large engine systems, reductant dosing may be increased as compared to that required by smaller engine systems. Sometimes, in the large engine systems the load on the reductant delivery module may increase due to thawing time required at engine startup.
- U.S. Pat. No. 8,586,895 describes a plastic vehicle tank for an aqueous urea solution used for reducing the hydrogen oxide content in exhaust gases of an internal combustion engine. The tank comprises a functional unit comprising at least one pump, at least one pressure control valve, at least one internal container provided with an internal electrical heating and at least one suction line. The functional unit is preferably mounted in the form of a lid on the container opening for closing it.
- In one aspect of the present disclosure, an aftertreatment system is disclosed. The aftertreatment system includes an exhaust conduit. The aftertreatment system also includes a selective catalytic reduction module configured to receive an exhaust gas flow from the exhaust conduit. The aftertreatment system also includes a reductant supply system configured to supply a reductant into the exhaust conduit upstream of the selective catalytic reduction module. The reductant supply system includes a reductant tank. The reductant supply system also includes a reductant injector. The reductant supply system further includes a pump assembly provided in fluid communication with the reductant tank and the reductant injector. The pump assembly includes a reversing valve assembly. The pump assembly also includes a pump unit. The pump assembly further includes a plurality of check valves associated with the pump unit. The pump assembly includes a pressure sensor. The pump assembly also includes a filter. The reductant supply system includes a back flow valve assembly provided in fluid communication with the pump assembly and the reductant tank. The reductant supply system also includes at least two header units associated with the pump assembly. The at least two header units include a reductant draw conduit configured to supply the reductant from the reductant tank to the pump assembly. The at least two header units also include at least one heat exchanger. The at least two header units further include a bag filtration assembly provided on each of the at least two header units.
- Other features and aspects of this disclosure will be apparent from the following description and the accompanying drawings.
-
FIG. 1 is a block diagram of an exemplary engine system including an aftertreatment system, according to one embodiment of the present disclosure; -
FIG. 2 is a schematic view of a reductant supply system of the aftertreatment system, according to one embodiment of the present disclosure; -
FIG. 3 is cross-sectional view of a reductant tank including two header units, according to one embodiment of the present disclosure; and -
FIG. 4 is a perspective view of one of the two header units, according to one embodiment of the present disclosure. - Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or the like parts. Referring to
FIG. 1 , a block diagram of anexemplary engine system 100 is illustrated, according to one embodiment of the present disclosure. Theengine system 100 includes anengine 102, which may be an internal combustion engine, such as, a reciprocating piston engine or a gas turbine engine. According to one embodiment of the disclosure, theengine 102 is a spark ignition engine or a compression ignition engine, such as, a diesel engine, a homogeneous charge compression ignition engine, or a reactivity controlled compression ignition engine, or other compression ignition engines known in the art. Theengine 102 may be fueled by gasoline, diesel fuel, biodiesel, dimethyl ether, alcohol, natural gas, propane, hydrogen, combinations thereof, or any other combustion fuel known in the art. - The
engine 102 may include other components, such as, a fuel system, an intake system, a drivetrain including a transmission system, and so on. Theengine 102 may be used to provide power to any machine including, but not limited to, an on-highway truck, an off-highway truck, an earth moving machine, an electric generator, and so on. Further, theengine system 100 may be associated with an industry including, but not limited to, transportation, construction, agriculture, forestry, power generation, and material handling. - The
engine system 100 includes anexhaust aftertreatment system 104 fluidly connected to an exhaust manifold of theengine 102. Theaftertreatment system 104 is configured to treat an exhaust gas flow exiting the exhaust manifold of theengine 102. The exhaust gas flow contains emission compounds that may include Nitrogen Oxides (NOx), unburned hydrocarbons, particulate matter and/or other combustion products known in the art. Theaftertreatment system 104 may be configured to trap or convert NOx, unburned hydrocarbons, particulate matter, combinations thereof, or other combustion products in the exhaust gas flow before exiting theengine system 100. - In the illustrated embodiment, the
aftertreatment system 104 includes afirst module 106 that is fluidly connected to anexhaust conduit 108 of theengine 102. During engine operation, thefirst module 106 is arranged to internally receive engine exhaust gas from theexhaust conduit 108. Thefirst module 106 may contain various exhaust gas treatment devices, such as, a Diesel Oxidation Catalyst (DOC) 110 and a Diesel Particulate Filter (DPF) 112, but other devices may be used. Thefirst module 106 and the components found therein are optional and may be omitted for various engine applications in which the exhaust treatment function provided by thefirst module 106 is not required. - In the illustrated embodiment, the exhaust gas provided to the
first module 106 by theengine 102 may first pass through theDOC 110 and then through theDPF 112 before entering atransfer conduit 114. Theaftertreatment system 104 includes areductant supply system 116. A reductant is injected into thetransfer conduit 114 by areductant injector 118. The reductant may be a fluid, such as, Diesel Exhaust Fluid (DEF). The reductant may include urea, ammonia, or other reducing agent known in the art. - Referring to
FIG. 2 , the reductant is contained within a reductant tank 120 (seeFIG. 2 ). Parameters related to thereductant tank 120 such as size, shape, location, and material used may vary according to system design and requirements. Further, thereductant injector 118 may be communicably coupled to acontroller 212. Based on control signals received from thecontroller 212, the reductant from thereductant tank 120 is provided to thereductant injector 118 by apump assembly 122. In one embodiment, thereductant supply system 116 may include two ormore reductant injectors 118. The number of thereductant injector 118 may vary based on the type of application. Various components of thereductant supply system 116 will be explained in detail in connection withFIGS. 2-4 . - As the reductant is injected into the
transfer conduit 114, the reductant mixes with the exhaust gas passing therethrough, and is carried to asecond module 124. Further, thetransfer conduit 114 is configured to fluidly interconnect thefirst module 106 with thesecond module 124, such that, the exhaust gas from theengine 102 may pass through the first andsecond modules stack 126 connected downstream of thesecond module 124. Thesecond module 124 encloses a Selective Catalytic Reduction (SCR)module 128 and an Ammonia Oxidation Catalyst (AMOX) 130. TheSCR module 128 operates to treat exhaust gases exiting theengine 102 in the presence of ammonia, which is provided after degradation of a urea-containing solution injected into the exhaust gases in thetransfer conduit 114. TheAMOX 130 is used to convert any ammonia slip from the downstream flow of theSCR module 128 before exiting the exhaust gas through thestack 126. - Further, in order to promote mixing of the reductant with the exhaust gas, a
mixer 132 may be disposed along thetransfer conduit 114. The mixing of the reductant with the exhaust gas is not limited to aseparate mixer 132 but may be accomplished with other known techniques, such as, acurved transfer conduit 114. The amount of the reductant that may be injected into thetransfer conduit 114 may be appropriately metered based on engine operating conditions. - The
aftertreatment system 104 disclosed herein is provided as a non-limiting example. It will be appreciated that theaftertreatment system 104 may be disposed in various arrangements and/or combinations relative to the exhaust manifold. These and other variations in aftertreatment system design are possible without deviating from the scope of the disclosure. -
FIG. 2 is a schematic view of thereductant supply system 116. According to an exemplary embodiment, thereductant tank 120 of thereductant supply system 116 includes two or more header units. In the illustrated embodiment, thereductant tank 120 includes afirst header unit 202 and asecond header unit 302. In one embodiment, thereductant tank 120 may include three or more such header units based on the type of application. The first andsecond header units reductant tank 120. Alternatively, the first andsecond header units reductant tank 120. - As shown in
FIGS. 2 and 3 , each of the first andsecond header units reductant draw conduit reductant draw conduits reductant tank 120. Thereductant draw conduit reductant tank 120. - Further, a
heat exchanger second header units heat exchanger engine 102. The coolant is generally at a temperature which is higher than that of the reductant, due to heat transfer between the coolant and various engine parts. - A coolant flow valve (not shown) may be associated with the coolant system and may be communicably coupled to the
controller 212. Based on an actuation signal received from thecontroller 212, the coolant flow valve may be actuated and the coolant may flow into theheat exchanger coolant inlet line second header units second header units reductant tank 120, thereby increasing the temperature of the reductant in thereductant tank 120. Further, after passing through theheat exchanger second header units coolant outlet line aftertreatment system 104. - Further, each of the first and
second header units level sensor 218, 318 (seeFIG. 3 ). As shown in the accompanying figures, thelevel sensor reductant draw conduit second header units level sensor reductant tank 120. Thelevel sensor reductant tank 120. - Each of the first and
second header units temperature sensor temperature sensors reductant tank 120. Thelevel sensors temperature sensors FIG. 2 ). Thereductant draw conduits second header units reductant draw conduits reductant tank 120. One of ordinary skill in the art would understand that various additional components may be added or certain components could be removed depending on the application of theheader unit - Each of the first and
second header units FIG. 4 shows a perspective view of the bag filtration assembly 220, 320 of the first orsecond header unit reductant tank 120. The bag filtration assembly 220, 320 is further configured to enclose and protect thereductant draw conduit heat exchanger second header units reductant tank 120. - Referring to
FIG. 3 , thereductant tank 120 may also include anopening 222 for receiving a supply of the reductant from an external source (not shown). Theopening 222 may be closed using acap member 224. Theopening 222 may be provided with a strainer (not shown) in order to restrict debris present in the incoming reductant from entering into thereductant tank 120. - Referring now to
FIG. 2 , each of thereductant draw conduits supply conduit 226. Thesupply conduit 226 is configured to fluidly couple thereductant draw conduit reductant injectors 118, via thepump assembly 122. Thepump assembly 122 includes a reversingvalve assembly 228. In one embodiment, the reversingvalve assembly 228 may be pressure controlled. - The reversing
valve assembly 228 may be communicably coupled with thecontroller 212. Based on control signals received from thecontroller 212, the reversingvalve assembly 228 may operate in a first position or a second position. In the accompanying figures, the reversingvalve assembly 228 is shown in the first position. The reversingvalve assembly 228 includes afirst flow passage 230 and asecond flow passage 232. Thefirst flow passage 230 of the reversingvalve assembly 228 is configured to fluidly couple thereductant draw conduit first check valve 234. Thefirst check valve 234 is provided downstream of the reversingvalve assembly 228. Thefirst check valve 234 is configured to restrict a reverse flow of the reductant flowing therethrough. - The
pump assembly 122 also includes apump unit 236 provided downstream of thefirst check valve 234. Thepump unit 236 is fluidly coupled to the reversingvalve assembly 228, via thefirst check valve 234. Thepump unit 236 is configured to pump and pressurize the reductant from thereductant tank 120 and supply the pressurized reductant to thereductant injector 118. Asecond check valve 238 is provided downstream of thepump unit 236. Thesecond check valve 238 is configured to restrict a reverse flow of the reductant towards thepump unit 236. The first andsecond check valves - The reductant exiting the
pump unit 236 is configured to flow through thesecond check valve 238 and thesecond flow passage 232 of the reversingvalve assembly 228. Further, thepump unit 236 also includes an in-line filter 240. More particularly, the in-line filter 240 is positioned between the reversingvalve assembly 228 and thereductant injector 118. The in-line filter 240 disclosed herein may be any type of known filter. - The
pump assembly 122 also includes apressure sensor 242. Thepressure sensor 242 may be communicably coupled to thecontroller 212. Thepressure sensor 242 may be provided downstream of the in-line filter 240. Under certain operating conditions, the amount of the reductant delivered by thepump unit 236 may exceed a reductant flow demand from thereductant injectors 118. In such a situation, the excess amount of the reductant supplied by thepump unit 236 may be recirculated to thereductant tank 120 via areductant return conduit 244. - The
reductant return conduit 244 fluidly connects thesupply conduit 226 with thereductant tank 120. A backflow valve assembly 246 may be provided in thereductant return conduit 244. A portion of excess reductant not required by thereductant injector 118 may be recirculated from thesupply conduit 226 to thereductant tank 120, through the backflow valve assembly 246. The backflow valve assembly 246 may be communicably coupled to thecontroller 212. Regulation of the backflow valve assembly 246 by thecontroller 212 may be based on the pressure sensed by thepressure sensor 242. - The illustrated back
flow valve assembly 246 is an electrically controlled diaphragm valve; however, alternative embodiments may include configurations wherein the backflow valve assembly 246 may include other valve mechanisms, such as, angle valves, piston valves, ball valves, rotary valves, sliding cylinder valves, etc. Further, while the backflow valve assembly 246 is electronically controlled, one of ordinary skill in the art would appreciate that other methods of controlling valves, e.g., pneumatically, or hydraulically controlled valves, may alternatively be used. - It should be noted that the
reductant supply system 116 illustrated in the accompanying figures includes asingle pump assembly 122 and asingle reductant injector 118. However, based on the type of application, thereductant supply system 116 may include multiple pump assemblies and multiple reductant injectors without deviating from the scope of the present disclosure. - Reductant supply system associated with aftertreatment systems of large diesel engines may require a comparatively greater amount of the reductant to be injected into the exhaust gas flow, due to high power requirements and higher NOx reduction requirements. In these systems an increase in demand in the reductant injection may in turn be affected by factors like filtration capacity of the reductant tank and thaw time during dosing, in order to meet the injection requirements.
- The present disclosure relates to the
reductant supply system 116 provided with at least twoheader units pump assembly 122. The number of header units per pump assembly may be varied based upon the size of theengine 102 and also the operating environment of theengine 102. The multiple header units may be retrofitted to an existingreductant tank 120 of thereductant supply system 116. - The working of the system will now be described in detail. During a dosing operation of the reductant, the
controller 212 may send control signals to the reversingvalve assembly 228 in order to actuate and operate the reversingvalve assembly 228 in the first position. Thecontroller 212 may then send control signals to actuate thepump unit 236. On actuation of thepump unit 236, the reductant from thereductant tank 120 may flow towards thepump unit 236, via thereductant draw conduits supply conduit 226, thefirst flow passage 230 and thefirst check valve 234. From thepump unit 236, the reductant may flow towards thereductant injectors 118, via thesecond check valve 238, thesecond flow passage 232, and the in-line filter 240. The reductant may then be injected into the exhaust gas flow by thereductant injectors 118. - The first and
second header units reductant supply system 116. The bag filtration assembly 220, 320 also protects the various components of the first andsecond header units reductant tank 120, thus improving a service life of the components. Further, each of the first andsecond header units individual heat exchangers engine 102, theheat exchangers reductant tank 120 in a thawed condition. - Accordingly, the
reductant supply system 116 disclosed herein may meet the dosing requirements of the large engine systems. In some embodiments, thereductant supply system 116 may assist in improving servicing intervals, dosing duration, and dosing requirements by almost twice to that of existent systems. - While aspects of the present disclosure have been particularly shown and described with reference to the embodiments above, it will be understood by those skilled in the art that various additional embodiments may be contemplated by the modification of the disclosed machines, systems and methods without departing from the spirit and scope of what is disclosed. Such embodiments should be understood to fall within the scope of the present disclosure as determined based upon the claims and any equivalents thereof
Claims (1)
1. An aftertreatment system comprising:
an exhaust conduit;
a selective catalytic reduction module configured to receive an exhaust gas flow from the exhaust conduit; and
a reductant supply system configured to supply a reductant into the exhaust conduit upstream of the selective catalytic reduction module, the reductant supply system comprising:
a reductant tank;
a reductant injector;
a pump assembly in fluid communication with the reductant tank and the reductant injector, the pump assembly comprising:
a reversing valve assembly;
a pump unit;
a plurality of check valves associated with the pump unit;
a pressure sensor; and
a filter;
a back flow valve assembly in fluid communication with the pump assembly and the reductant tank;
at least two header units associated with the pump assembly, each of the at least two header units comprising:
a reductant draw conduit configured to supply the reductant from the reductant tank to the pump assembly; and
at least one heat exchanger; and
a bag filtration assembly provided on each of the at least two header units.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US14/510,141 US20150023843A1 (en) | 2014-10-09 | 2014-10-09 | Reductant supply system |
CN201520793944.9U CN205047281U (en) | 2014-10-09 | 2015-10-09 | After -treatment system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US14/510,141 US20150023843A1 (en) | 2014-10-09 | 2014-10-09 | Reductant supply system |
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US20150023843A1 true US20150023843A1 (en) | 2015-01-22 |
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US14/510,141 Abandoned US20150023843A1 (en) | 2014-10-09 | 2014-10-09 | Reductant supply system |
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CN (1) | CN205047281U (en) |
Cited By (7)
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US20170138826A1 (en) * | 2015-11-16 | 2017-05-18 | Wema System As | Debubbling Sleeve For Fluid Sensors and Sensor Systems Comprising Same |
US10036294B2 (en) | 2015-05-28 | 2018-07-31 | Caterpillar Inc. | Aftertreatment module with reduced bypass flow |
US10328366B2 (en) * | 2015-05-21 | 2019-06-25 | Caterpillar Inc. | Fluid reservoir having inlet filtering |
JP2020056393A (en) * | 2018-10-03 | 2020-04-09 | 株式会社三五 | Exhaust purification device |
US11384669B2 (en) | 2019-07-12 | 2022-07-12 | Caterpillar Inc. | Integrated base filter for a DEF manifold |
US11383187B2 (en) * | 2019-01-23 | 2022-07-12 | MEAS France | Suction tube filter arrangement and fluid tank system for a fluid tank |
US11674424B2 (en) | 2021-10-08 | 2023-06-13 | Cummins Emission Solutions Inc. | Reductant tank assembly with multiple connection tank header |
Families Citing this family (2)
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CN106545387A (en) * | 2016-10-21 | 2017-03-29 | 潍柴动力空气净化科技有限公司 | Urea pump system, carbamide method for controlling pump, electromotor SCR system and electromotor |
CN106762048A (en) * | 2017-01-18 | 2017-05-31 | 重庆凯瑞伟柯斯环保科技有限公司 | Pumping unit and the urea liquid feed system and method for SCR system crystallization-preventive |
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US20040083723A1 (en) * | 2001-03-30 | 2004-05-06 | Bernhard Hager | Device for the post-treatment of exhaust gases of an internal combustion engine |
US6912846B2 (en) * | 2000-09-22 | 2005-07-05 | Robert Bosch Gmbh | Method and apparatus for metering a reducing agent for removing nitrogen oxides from exhaust gases |
US7775036B2 (en) * | 2005-01-17 | 2010-08-17 | Robert Bosch Gmbh | Exhaust gas subsequent treatment method and method therefor |
US20110000196A1 (en) * | 2008-03-07 | 2011-01-06 | Hiroyuki Kasahara | Control device of reducing agent supply apparatus, reducing agent collection method, and exhaust gas purification apparatus |
US20120181261A1 (en) * | 2009-09-11 | 2012-07-19 | Emitec Gesellschaft Fur Emissionstechnologie Mbh | Method for heating a delivery device for a reducing agent |
-
2014
- 2014-10-09 US US14/510,141 patent/US20150023843A1/en not_active Abandoned
-
2015
- 2015-10-09 CN CN201520793944.9U patent/CN205047281U/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US6912846B2 (en) * | 2000-09-22 | 2005-07-05 | Robert Bosch Gmbh | Method and apparatus for metering a reducing agent for removing nitrogen oxides from exhaust gases |
US20040083723A1 (en) * | 2001-03-30 | 2004-05-06 | Bernhard Hager | Device for the post-treatment of exhaust gases of an internal combustion engine |
US7775036B2 (en) * | 2005-01-17 | 2010-08-17 | Robert Bosch Gmbh | Exhaust gas subsequent treatment method and method therefor |
US20110000196A1 (en) * | 2008-03-07 | 2011-01-06 | Hiroyuki Kasahara | Control device of reducing agent supply apparatus, reducing agent collection method, and exhaust gas purification apparatus |
US20120181261A1 (en) * | 2009-09-11 | 2012-07-19 | Emitec Gesellschaft Fur Emissionstechnologie Mbh | Method for heating a delivery device for a reducing agent |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US10328366B2 (en) * | 2015-05-21 | 2019-06-25 | Caterpillar Inc. | Fluid reservoir having inlet filtering |
US10036294B2 (en) | 2015-05-28 | 2018-07-31 | Caterpillar Inc. | Aftertreatment module with reduced bypass flow |
US20170138826A1 (en) * | 2015-11-16 | 2017-05-18 | Wema System As | Debubbling Sleeve For Fluid Sensors and Sensor Systems Comprising Same |
US10794734B2 (en) * | 2015-11-16 | 2020-10-06 | Te Connectivity Norag As | Debubbling sleeve for fluid sensors and sensor systems comprising same |
JP2020056393A (en) * | 2018-10-03 | 2020-04-09 | 株式会社三五 | Exhaust purification device |
JP7232631B2 (en) | 2018-10-03 | 2023-03-03 | 株式会社三五 | Exhaust purification device |
US11383187B2 (en) * | 2019-01-23 | 2022-07-12 | MEAS France | Suction tube filter arrangement and fluid tank system for a fluid tank |
US11384669B2 (en) | 2019-07-12 | 2022-07-12 | Caterpillar Inc. | Integrated base filter for a DEF manifold |
US11674424B2 (en) | 2021-10-08 | 2023-06-13 | Cummins Emission Solutions Inc. | Reductant tank assembly with multiple connection tank header |
Also Published As
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CN205047281U (en) | 2016-02-24 |
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