US20140007556A1 - Reducing Agent Metering System with Evacuation of the Reducing Agent Line after Completion of Metering - Google Patents

Reducing Agent Metering System with Evacuation of the Reducing Agent Line after Completion of Metering Download PDF

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Publication number
US20140007556A1
US20140007556A1 US13/933,246 US201313933246A US2014007556A1 US 20140007556 A1 US20140007556 A1 US 20140007556A1 US 201313933246 A US201313933246 A US 201313933246A US 2014007556 A1 US2014007556 A1 US 2014007556A1
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United States
Prior art keywords
venturi tube
branch
reducing agent
nozzle
metering system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/933,246
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English (en)
Inventor
Denis Leichinger
Werner Overhoff
Volker Schaika
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Albonair GmbH
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Albonair GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Albonair GmbH filed Critical Albonair GmbH
Assigned to ALBONAIR GMBH reassignment ALBONAIR GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHAIKA, VOLKER, LEICHINGER, DENIS, OVERHOFF, WERNER
Publication of US20140007556A1 publication Critical patent/US20140007556A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
    • 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
    • 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
    • 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
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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
    • F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a reducing agent metering system for injection of a reducing agent into the exhaust gas flow of an internal combustion engine for selective catalytic reduction, the metering system being connected/connectable to a reducing agent tank from which the reducing agent is taken and delivered by means of a delivery pump via a delivery line and is introduced into the exhaust gas flow of the internal combustion engine via at least one nozzle.
  • the invention relates to a method for operating a reducing agent metering system for injection of a reducing agent into the exhaust gas flow of an internal combustion engine for selective catalytic reduction, the metering system being connected/connectable to a reducing agent tank from which the reducing agent is taken and delivered by means of a delivery pump via a delivery line and is introduced into the exhaust gas flow of the internal combustion engine via at least one nozzle.
  • SCR-catalytic converters for selective catalytic reduction
  • SCR selective catalytic reduction
  • a reducing agent is injected into the exhaust gas system with a metering device.
  • the reducing agent is ammonia or an ammonia solution or another reducing agent.
  • urea in an aqueous solution with conventionally a 32.5% urea proportion according to DIN 70070, so-called AdBlue is used.
  • AdBlue a 32.5% urea proportion according to DIN 70070
  • the parameters for the decomposition of urea are essentially time (vaporization and reaction time), temperature and droplet size of the injected urea solution.
  • SCR catalytic converters the emission of nitrogen oxides is reduced by roughly 90% by selective catalytic reduction (SCR).
  • the 32.5% solution which is conventionally used freezes at roughly ⁇ 11° C. and expands by roughly 10%, components of the metering system can be damaged as a result of the expansion of the aqueous solution or of the portion of water of the solution.
  • the problem of freezing also relates to any aqueous solution of a reducing agent other than the 32.5% urea solution which is often used as the reducing agent. As a result of the high proportion of water in the aqueous reducing agent solution, freezing damage can occur due to the anomaly of water at low temperatures.
  • Another problem is that the reducing agent solution could crystallize. After completion of injection of the reducing agent the nozzle must therefore be cleared of residues of the reducing agent solution to prevent their crystallizing and clogging the outlet opening of the nozzle.
  • DE 10 2008 013 960 A1 discloses cleaning the components which carry the reducing agent by means of compressed air after completion of metering.
  • the disadvantage is that this procedure requires that a certain minimum pressure be maintained in a compressed air system for a certain time interval after completion of metering and the procedure is not fault-tolerant for example in a failure of the electrical supply of the metering system.
  • Another disadvantage in this approach is that there must be a compressed air line solely for blowing out the delivery line of the reducing agent and the nozzle, as a result of which the systems engineering cost is increased and the remaining amount of the reducing agent is injected unused into the exhaust gas line.
  • the object of the invention is to develop a reducing agent metering system of the initially named type such that evacuation of the reducing agent delivery line and the nozzle is enabled in the metering pauses and after completion of metering at reduced system cost, so that these components are reliably cleared of residues of the reducing agent solution in order to prevent freezing damage and clogging without a separate compressed air supply for ventilating the reducing agent delivery line and the nozzle having to be provided.
  • Another object of the invention is to devise a method for operating a reducing agent metering system which enables evacuation of the reducing agent delivery line and the nozzle in the metering pauses and after completion of metering at reduced system cost without the reducing agent delivery line and the nozzle having to be blown out by means of compressed air.
  • a Venturi tube is integrated into the delivery line and has a branch which discharges into the nozzle, at the outlet of the Venturi tube there being an openable shutoff element so that with the shutoff element opened the reducing agent which is located in the nozzle and the branch is intaken as a suction medium into the Venturi tube and is carried away via the outlet.
  • a Venturi tube is integrated into the delivery line and has a branch which discharges into the nozzle, at the outlet of the Venturi tube there being an openable shutoff element which is closed during metering operation and is opened when metering is completed so that with the shutoff element opened the reducing agent which is located in the nozzle and the branch is intaken as a suction medium into the Venturi tube and is carried away via the outlet.
  • reducing agent metering system and metering system are used synonymously within the scope of this specification.
  • reducing agent solution or reducing agent encompasses any reducing agent which is suitable for selective catalytic reduction, preferably a urea solution according to DIN 70070 is used for this purpose. But the invention is not limited thereto.
  • the reducing agent metering system has a tank which is filled with the reducing agent solution and from which the reducing agent solution is taken and delivered by means of a metering pump and is introduced into the exhaust gas flow of the internal combustion engine via at least one nozzle.
  • the shutoff element at the outlet of the Venturi tube is closed so that the reducing agent is delivered to the nozzle via the branch.
  • the shutoff element at the outlet of the Venturi tube is opened so that the delivery flow of the reducing agent flows from the inlet into the Venturi tube straight to the outlet of the Venturi tube and due to the acceleration of the flow in the Venturi tube the static pressure drops, as a result of which the reducing agent which is located in the branch line to the nozzle is intaken by the so-called Venturi effect according to the action principle of the jet pump and is carried away with the main flow via the outlet of the Venturi tube.
  • the outlet of the Venturi tube can be connected to the tank so that the amount which has been sucked back out of the branch line can be delivered back to the tank.
  • the delivery flow of the reducing agent during metering operation is delivered exclusively via the branch line to the nozzle, and upon completion or interruption of metering operation after opening of the shutoff element which is provided at the outlet of the Venturi tube, by the operation of the Venturi tube as a jet pump the delivery flow is intaken and carried away out of the nozzle and the branch line back into the Venturi tube.
  • the nozzle together with the nozzle opening and the delivery line which is located upstream are evacuated after completion of the injection of the reducing agent which could otherwise freeze or crystallize out and clog the nozzle.
  • the core of the invention is thus the arrangement of a Venturi tube which can be shut off in the delivery line on the pressure side of the delivery pump, which tube is used during operation as a simple elbow to the branch line toward the nozzle and upon completion or interruption of metering operation is used as a jet pump for evacuating the branch line and the nozzle.
  • the invention devises a simple system with which it is possible to withdraw the liquid in the nozzle and in the feed line to the nozzle after completion of metering.
  • the principle of the suction jet pump is used, i.e. the negative pressure which arises in the Venturi tube by accelerating the delivery liquid provides for the intake of the liquid from the nozzle and the feed line to the nozzle.
  • the branch is located in the region of a narrowing of the Venturi tube.
  • the flow in the Venturi tube is accelerated.
  • the static pressure in the delivered liquid drops in the region of the narrowing.
  • the branch is located half in or directly in front of a cross sectional widening of the Venturi tube.
  • the branch can be located spaced upstream in front of a cross sectional widening of the Venturi tube.
  • the flow can be returned again to those flow states prevailing upstream of the Venturi tube with respect to the pressure in the fluid and with respect to the flow velocity by this cross sectional widening downstream of the branch.
  • the branch is located in the region of a propellant nozzle of the delivery line, which nozzle discharges into the Venturi tube.
  • the Venturi tube can be made like a jet pump by a propellant nozzle of the delivery line discharging into a chamber, the branch to the nozzle discharging into the same chamber. Downstream of the branch there can then be a cross sectional narrowing followed by a diffusor as far as the outlet of the Venturi tube. This configuration then corresponds to the typical structure of a jet pump.
  • the branch to the nozzle can be located vertically on the Venturi tube or however can include an acute angle with the Venturi tube.
  • the acute angle can be formed in such a way and the branch can be located on the Venturi tube in such a way that the flow direction from the inflow into the Venturi tube and the discharge out of the branch toward the nozzle is deflected by up to 135°, especially by up to 150°. If the branch is located vertically on the Venturi tube, the flow with the shutoff element closed is deflected at the outlet of the Venturi tube by 90° so that the entire unit in this case is used like a simple pipe elbow.
  • the inside diameter of the Venturi tube in the region of the branch can be less than or equal to 5 mm, especially less than or equal to 4 mm, especially less than or equal to 3 mm, especially less than or equal to 2 mm, especially less than or equal to 1 mm, especially less than or equal to 0.8 mm.
  • the inside diameter of the branch can likewise be less than or equal to 5 mm, especially less than or equal to 4 mm, especially less than or equal to 3 mm, especially less than or equal to 2 mm, especially less than or equal to 1 mm, especially less than or equal to 0.8 mm.
  • the reducing agent metering system there is a compressed air supply, the reducing agent being atomized inside or outside of the nozzle by means of compressed air.
  • a mixing chamber within which atomization of the reducing agent by means of compressed air takes place prior to introduction into the exhaust gas line.
  • the nozzle is made as an externally mixing binary nozzle in which the reducing agent solution emerges from a first nozzle opening and compressed air emerges from a second nozzle opening, the two nozzle openings being aligned to one another such that the compressed air atomizes the reducing agent outside of the nozzle so that the nozzle is made as an externally mixing binary nozzle and aerosol formation occurs outside of the nozzle.
  • a compressed air supply which has a switching valve and/or a pressure control valve.
  • This switching valve is used for control, i.e. turning the compressed air supply on and off.
  • the compressed air supply can have a pressure control valve.
  • the compressed air can be set to a pressure level which is desired for atomization of the reducing agent by means of compressed air.
  • the compressed air itself can be taken from an embarked compressed air system, for example of a truck, in whose exhaust gas line the metering system is located, without the system pressure which is prevailing in the compressed air system constituting a limitation since the pressure of the compressed air can be reduced to the desired pressure.
  • the metering pump can be especially a membrane pump or a piston pump or a centrifugal pump or an orbital pump or a geared pump.
  • a membrane pump which is used as a metering pump can be triggered for example with a frequency of up to 50 Hz or up to 100 Hz.
  • the triggering signal of the membrane pump can be pulse width modulated.
  • This pulse width modulation of the triggering signal of the membrane pump can improve the metering accuracy and the noise behavior.
  • the metering accuracy can be distinctly improved by the triggering of a membrane pump with a pulse width modulated signal.
  • the instantaneous delivery of the membrane pump can be matched to the respective operating state of the internal combustion engine and to the temperature and mass flow of the exhaust gas by pulse width modulation of the triggering signal of the membrane pump so that the metering of the reducing agent can take place exactly, tailored to demand.
  • FIG. 1 shows a first embodiment of a Venturi tube which is integrated into the delivery line with the branch to the nozzle;
  • FIG. 2 shows a second embodiment of a Venturi tube which is integrated into the delivery line with the branch to the nozzle;
  • FIG. 3 shows a third embodiment of a Venturi tube which is integrated into the delivery line with the branch to the nozzle;
  • FIG. 4 shows a fourth embodiment of a Venturi tube which is integrated into the delivery line with the branch to the nozzle;
  • FIGS. 1 to 4 each show an extract from the delivery line 1 of a reducing agent metering system for injection of a reducing agent into the exhaust gas flow of an internal combustion engine for selective catalytic reduction.
  • the metering system is connected to a reducing agent tank from which the reducing agent is taken and delivered by means of a delivery pump which is not shown via the delivery line 1 .
  • a Venturi tube 2 which in the exemplary embodiments shown in FIGS. 1 to 3 has a narrowing 5 and furthermore in the region of the narrowing 5 a branch 3 is integrated into the delivery line 1 .
  • the branch 3 widens to a line diameter corresponding to the delivery line 1 and discharges into the nozzle which is not shown and via which the reducing agent is injected into the exhaust gas line of the internal combustion engine.
  • a cross sectional widening 6 of the Venturi tube follows downstream of the branch 3 .
  • a switchable shutoff element by means of which the outlet 4 of the Venturi tube can be closed off.
  • the shutoff element at the outlet 4 of the Venturi tube 2 is closed so that the reducing agent which has been delivered via the delivery line 1 is delivered to the nozzle via the branch 3 and is injected into the exhaust gas line of the internal combustion engine.
  • the branch 3 in the region of the narrowing 5 is spaced apart from a cross sectional widening 6 of the Venturi tube 2 , which widening follows downstream.
  • the branch 3 is located vertically on the Venturi tube 2 .
  • the branch 3 is likewise located vertically on the Venturi tube 2 and is likewise located in the region of the narrowing 5 of the Venturi tube 2 .
  • the branch 3 is however not spaced upstream in front of a cross sectional widening 6 of the Venturi tube 2 , but is located half in the cross sectional widening 6 of the Venturi tube 2 , as can be taken from FIG. 2 .
  • the branch 3 is located diagonally on the Venturi tube 2 so that an acute angle ⁇ is included between the branch 3 and the Venturi tube 2 .
  • the branch 3 in the region of the narrowing 5 of the Venturi tube 2 is located half in a cross sectional widening 6 .
  • the narrowing 5 of the Venturi tube 2 has an inside diameter of 1 mm.
  • the branch line can likewise have an inside diameter of 1 mm or even a smaller diameter than the narrowing 5 of the Venturi tube 2 , the branch line 3 then widening in the direction to the nozzle to a line diameter corresponding to the delivery line 1 . But it has been shown that the branch line 3 and the nozzle can be especially efficiently evacuated when the branch line 3 in the connection region to the Venturi tube 2 has a diameter which is somewhat smaller than the narrowing 5 of the Venturi tube 2 .
  • FIG. 4 shows another embodiment of the invention.
  • a Venturi tube 2 is integrated into the delivery line 1 , the Venturi tube in this case having the classic structure of a jet pump.
  • a propellant nozzle discharges into the mixing chamber 7 which has a cross sectional narrowing and is followed downstream by the diffusor 8 .
  • the branch 3 toward the nozzle is located in the region of the mixing chamber.
  • the Venturi tube at the outlet 4 has a switchable shutoff element which is closed during metering operation so that the delivered fluid discharges via the branch line 3 toward the nozzle and is injected into the exhaust gas line of the internal combustion engine.
  • the shutoff element at the outlet 4 of the Venturi tube 2 is opened so that the overall arrangement according to FIG. 4 works like a jet pump and the reducing agent which has been delivered via the delivery line 1 is used as the propellant medium and the fluid which is located in the branch line is intaken as a suction medium into the mixing chamber 7 and is carried away via the outlet 4 .
  • the embodiment according to FIG. 4 has an extremely complex structure, but it has been shown in tests that this embodiment also forms the most effective version for prompt and reliable evacuation of the branch line 3 and the nozzle.
  • the invention thus makes available a reducing agent metering system for injection of a reducing agent into the exhaust gas flow of an internal combustion engine for selective catalytic reduction, in which by means of one especially advantageous configuration of the delivery line 1 , by integration of a Venturi tube 2 and a change of the flow direction by switching the switchable shutoff element at the outlet 4 of the Venturi tube 2 by a change of the flow direction a Venturi effect is produced which is used according to the principle of a suction jet pump in order to evacuate the branch line 3 and the nozzle and to intake the reducing agent which is located in the branch line 3 into the Venturi tube 2 and to carry it away via the outlet 4 .
  • the reducing agent solution which is to be metered is used at the same time as a propellant medium of a jet pump.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (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)
US13/933,246 2012-07-09 2013-07-02 Reducing Agent Metering System with Evacuation of the Reducing Agent Line after Completion of Metering Abandoned US20140007556A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012013468.1A DE102012013468A1 (de) 2012-07-09 2012-07-09 Reduktionsmitteldosiersystem mit Entleerung der Reduktionsmittelleitung nach Beendigung der Dosierung
DE102012013468.1 2012-07-09

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US20140007556A1 true US20140007556A1 (en) 2014-01-09

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US (1) US20140007556A1 (de)
EP (1) EP2685060B1 (de)
DE (1) DE102012013468A1 (de)

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CN105986864A (zh) * 2015-01-05 2016-10-05 浙江福爱电子有限公司 一种scr喷射***
CN108915829A (zh) * 2018-08-16 2018-11-30 湖北芙源春贸易有限公司 文丘里换向装置及基于该装置的尿素反抽装置
CN115672205A (zh) * 2021-07-23 2023-02-03 中国石油天然气股份有限公司 一种颗粒型催化剂加注设备

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DE102017215950A1 (de) * 2017-09-11 2019-03-14 Robert Bosch Gmbh Verbindungsstück für Fluidleitungen eines Abgasnachbehandlungssystems
DE102019118405A1 (de) * 2019-07-08 2021-01-14 Denso Corporation Reinigung einer Urea-Einspritzvorrichtung
CN111088784B (zh) * 2019-12-14 2021-09-03 同济大学 一种文丘里效应控制的无动力水面垃圾收集器

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US20110297256A1 (en) * 2010-06-03 2011-12-08 Delphi Technologies Holding, S.Arl Stress relief in pressurized fluid flow system
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CN105986864A (zh) * 2015-01-05 2016-10-05 浙江福爱电子有限公司 一种scr喷射***
CN105986864B (zh) * 2015-01-05 2019-05-17 浙江福爱电子有限公司 一种scr喷射***
CN108915829A (zh) * 2018-08-16 2018-11-30 湖北芙源春贸易有限公司 文丘里换向装置及基于该装置的尿素反抽装置
CN115672205A (zh) * 2021-07-23 2023-02-03 中国石油天然气股份有限公司 一种颗粒型催化剂加注设备

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