CA3001076A1 - A urea injection apparatus for exhaust post-treatment of diesel engine - Google Patents

A urea injection apparatus for exhaust post-treatment of diesel engine Download PDF

Info

Publication number
CA3001076A1
CA3001076A1 CA3001076A CA3001076A CA3001076A1 CA 3001076 A1 CA3001076 A1 CA 3001076A1 CA 3001076 A CA3001076 A CA 3001076A CA 3001076 A CA3001076 A CA 3001076A CA 3001076 A1 CA3001076 A1 CA 3001076A1
Authority
CA
Canada
Prior art keywords
powder
urea
water
valve
pipe
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.)
Granted
Application number
CA3001076A
Other languages
French (fr)
Other versions
CA3001076C (en
Inventor
Wei Tian
Xun Zhang
Suozhu PAN
Peng QIU
Zhiqiang Han
Weiqiang Han
Xueshun WU
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.)
Xihua University
Original Assignee
Xihua University
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 Xihua University filed Critical Xihua University
Publication of CA3001076A1 publication Critical patent/CA3001076A1/en
Application granted granted Critical
Publication of CA3001076C publication Critical patent/CA3001076C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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]
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • 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
    • B01D53/9413—Processes characterised by a specific catalyst
    • B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
    • 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
    • F01N3/2066—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
    • F01N3/24—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—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
    • F01N2610/02—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
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • 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
    • F01N2610/12—Adding substances to exhaust gases the substance being in solid form, e.g. pellets or powder
    • 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
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • 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

Abstract

A urea injection device used for diesel exhaust after-treatment comprises an injection device body (20), a pressure stabilizing air source (21), a water tank (25), a urea tank (30), and a signal detection control unit; the injection device body (20) comprises a housing (10) and a powder cavity, a powder inlet (11) and a powder injection opening are provided on the powder cavity, and the powder injection opening is provided with a pin valve (1); a conical-surface water injection passage (7) is reserved between the housing (10) and the powder cavity, and a water inlet (5) is provided on the housing (10); the pressure stabilizing air source (21) is separately connected to the water tank (25) and the urea tank (30), as well as the water inlet (5) and the powder inlet (11); the water tank (25) is connected to the water inlet (5), and a water inlet pipe (26) is provided with a water valve (27); and the urea tank (30) is connected to the powder inlet (11), and a urea powder pipe (29) is provided with a urea powder valve (28). Urea powder and water are separated for storage, thereby avoiding the problems of metamorphism and uneven concentration distribution caused by long-time placement of a urea solution, and also avoiding the problem of capability in making the urea solution go bad during heating and deicing treatment; and aiding in a thermal cracking reaction of urea, increasing the conversion efficiency, and enlarging the working range.

Description

A UREA INJECTION APPARATUS FOR EXHAUST POST-TREATMENT OF DIESEL ENGINE
Technical Field [0001] The present invention relates to the technical field of post-treatment of nitrogen and oxygen emissions of internal combustion engine, in particular, to a urea injection apparatus for exhaust post-treatment of diesel engine.
Background
[0002] On the basis that selective catalyst reaction technology in diesel engine exhaust post treatment has good fuel economy; can use a common post treatment apparatus while meeting the European stage IV and European stage V emission standards; and is not sensitive to the sulfur content of the fuel etc., the selective catalytic reduction system is allowed to become a main technical means for diesel engine, which meets European stage IV and European stage V emission standards. However, at present, SCR
(selective catalyst reaction) system ejects urea solution containing 32.5% of urea, and the urea solution is stored as a mixture. When stored for long periods of time, the urea solution may deteriorate and cause uneven variation in solution concentration. Furthermore, during the de-icing-heating process for the urea solution, the solution would cause issues such as urea decomposition.
Summary of the Invention
[0003] To solve above problem, the purpose of the present invention is to provide an externally-mixed urea injection apparatus for exhaust gas post-treatment of diesel engines capable of storing urea powder and water separately. The technical solutions are as follows:
A urea injection apparatus for exhaust post-treatment of diesel engine, comprising an injection apparatus body including a housing and a powder cavity provided with a powder inlet and a powder injection outlet, the powder injection outlet being provided with a needle valve; the housing being sleeved outside of the powder cavity and a conical surface water spray channel is disposed between an outer wall of the powder injection outlet and the housing, a water inlet ring groove being provided between the housing and the powder cavity, the water inlet ring groove being in communication with the conical surface water spray channel, the housing further being provided with a water inlet leading to the water inlet ring groove; further comprising a pressure stabilizing gas source, a water tank and a urea tank; the pressure stabilizing gas source being connected with a head pipe, the head pipe having a head valve; the head pipe being connected to the water tank through a water tank intake pipe, and to the urea tank through a urea tank intake pipe respectively, and also connected to the water inlet and the powder inlet through a gas distribution pipe respectively; the gas distribution pipe being provided with a gas distribution valve; the water tank being connected to the water inlet through a water intake pipe, the water intake pipe being provided with a water valve; the urea tank being connected to the powder inlet through a urea powder pipe, the urea powder pipe being provided with a urea powder valve;
and further comprising a signal detection control unit for sending a control signal to the head valve, the gas distribution valve, the water valve, the urea powder valve and the needle valve.
[0004] Further, the urea tank intake pipe is further provided with a drying can.
[0005] Further, the powder cavity is formed by connecting a needle valve base connected to a bottom of a cylindrical partition; the needle valve is mounted on the needle valve base; the water inlet ring groove is formed by the groove on an outer wall of the partition and the housing.
[0006] Further, a needle valve seal ring is provided between the needle valve and the needle valve base, a urea powder seal ring is provided between the needle valve base and the housing, and a water seal ring is provided between the partition and the housing.
[0007] The beneficial effect of the invention is:
1. The urea powder is stored separately from the water to avoid the problem of the deterioration and uneven distribution of the concentration caused by the prolonged storage of the urea solution and also to avoid the problem that the urea solution may deteriorate during the de-icing heating treatment;
2. The injection amount of urea solution is controlled by the injection apparatus, which eliminates the need of a metering pump and simplifies the components of the NOx post-treatment system, thereby saving costs;
3. The high pressure air mixed in the urea powder helps to spray for the atomization effect;
4. As the urea powder injection faces the water and the exhaust injection, the urea powder will first make contact with the water and the high temperature exhaust, thus being conducive to thermal decomposition of urea;
5. Since the actual reaction demand of urea and water is 1: 1, the ratio of urea to water in urea solution currently used at a urea concentration of 32.5% is about 1:
2, the amount of water in latter urea solution is doubled, the present apparatus can spray less water to reduce the effect of reducing the exhaust temperature caused by water evaporation and water heat capacity, so it is conducive to lowering the lower limit of critical operating temperature for the system, can improve conversion efficiency and expand the scope of work.
Brief Description of the Drawings
[0008] Fig. 1 is a structure and working principle diagram for the urea injection apparatus used for exhaust gas post-treatment of diesel engines in the present invention.
[0009] Fig. 2 is a structure diagram for the body of the urea injection apparatus used for exhaust gas post-treatment of diesel engines in the present invention.
[0010] In figures: 1-needle valve; 2-needle valve mount; 3-urea powder seal ring; 4-urea powder cavity; 5-water inlet; 6-partition; 7-conical surface water spray channel; 8-water inlet ring groove; 9-water seal ring; 10-housing; 11-powder inlet; 12-needle valve seal ring;
20-injection apparatus body; 21-pressure stabilizing gas source; 22-head valve; 23-water tank intake pipe; 24-gas distribution pipe; 25-water tank; 26-water intake pipe; 27-water valve; 28-urea powder valve; 29-urea powder pipe; 30-urea tank; 31-drying can;
32-urea tank intake pipe; 33-head pipe; 34-gas distribution pipe.
Detailed Description of the Embodiments
[0011] In order that the objectives, technical schemes and advantages of the present invention will become more apparent, the present invention will be described in more detail with reference to the drawings and examples below.
[0012] As shown in Fig. 1, a urea injection apparatus for exhaust gas post-treatment of diesel engines includes an injection apparatus body 20, a pressure stabilizing gas source 21, a water tank 25 and a urea tank 30.
[0013] As shown in Fig. 2, the injection apparatus body 20 includes a housing 10 and a powder cavity. The powder cavity is provided with a powder inlet 11 and a powder injection outlet provided with a needle valve 1. The powder cavity is constituted by connecting a needle valve base 2 with the bottom or base of a cylindrical partition 6, and a urea powder cavity 4 is formed therein. The needle valve base 2 is fixed at the left of the partition 6 and the powder injection outlet is provided at the right of the partition 6. The needle valve 1 is mounted on the needle valve base 2, and an outer conical surface of the right part of needle valve 1 cooperates with an inner conical surface of powder injection outlet at the right of partition 6 to inject the urea powder.
[0014] The housing 10 is sleeved outside the powder cavity, i.e. is sleeved outside the needle valve base 2 and partition 6, and leaves a conical surface water spray channel 7 with the partition 6 between the outer wall at the powder injection outlet. The outer wall at the right of partition 6 is a conical surface, wherein the inside is smaller than the outside. The inner wall of the opening of the housing 10 at this point is also a conical surface.
The above conical surfaces are parallel, and separated by a certain distance, so as to form a conical surface water spray channel 7.
[0015] A water inlet ring groove 8 is provided between the housing 10 and the powder cavity, the water inlet ring groove 8 is in communication with the conical surface water spray channel 7, and the housing 10 is further provided with a water inlet 5 leading to the water inlet ring groove 8. The water inlet ring groove 8 is constituted by the groove on the outer wall of the partition 6 and the housing 10.
[0016] The pressure stabilizing gas source 21 is connected with a head pipe 33 and the head pipe 33 is provided with a head valve 22; the head pipe 33 is connected to the water tank 25 through a water tank intake pipe 23, to the urea tank 30 through a urea tank intake pipe 32 respectively, and also to the water inlet 5 and the powder inlet 11 through a gas distribution pipe 34 respectively; the gas distribution pipe 34 is provided with a gas distribution valve 24; the water tank 25 is connected to the water inlet 5 through a water intake pipe 26 and the water intake pipe 26 is provided with a water valve 27; the urea tank 30 is connected to the powder inlet 11 through a urea powder pipe 29 and the urea powder pipe 29 is provided with a urea powder valve 28. The urea tank intake pipe 32 is further provided with a drying can 31 for allowing the high pressure air entering the urea tank 30 to be dried to facilitate formation of urea powder into an aerosol.
[0017] The apparatus further comprise a signal detection control unit used to send a control signal to the head valve 22, the gas distribution valve 24, the water valve 27, the urea powder valve 28 and the needle valve 1.
[0018] Preferably, in order to achieve a better sealing effect, a needle valve seal ring 12 is provided between the needle valve 1 and the needle valve base 2, a urea powder seal ring 3 is provided between the needle valve base 2 and the housing 10, and a water seal ring 9 is provided between the partition 6 and the housing 10.
[0019] Among those, a water pipe three-way joint is provided at the water inlet 5, wherein the lower interface of the water pipe three-way joint is connected with the water inlet ring groove 8, the middle interface is connected with the gas distribution pipe 34, and the upper 5 interface is connected with the water intake pipe 26. A powder pipe three-way joint is provided at the powder inlet 11, wherein the upper interface of the powder pipe three-way joint is connected with the urea powder cavity 4, the lower interface is connected with the urea powder pipe 29, and the middle interface is connected with the gas distribution pipe 34.
[0020] The working process is as follows:
When the signal detection control unit has detected an initiation signal of engine, the head valve 22 is controlled to open, and at this time, the gas distribution valve 24, the water valve 27 and the urea powder valve 28 is in a closed position.
[0021] When the signal detection control unit has detected an injection signal of urea, the water valve 27, the urea powder valve 28, and the needle valve 1 in the injection apparatus body 20 are opened sequentially. One part of the gas in the pressure stabilizing gas source 21 enters the water tank 25 via the water tank intake pipe 23 through the head valve 2, while another part enters the drying can 31 for removing the water via the urea tank intake pipe 32 and then into the urea tank 30; the water in the water tank 25 enters the water inlet ring groove 8 via the water pipe 26 and the water valve 27 under the pressure of the gas, and then is injected into the intake pipe via the conical surface water spray channel 7; the urea powder in the urea tank 30 enters the urea powder cavity 4 via the urea powder pipe 29 and the urea powder valve 28 with the aid of gas, and finally is injected into the exhaust pipe through the control needle valve 1 in a fixed amount.
[0022] When the signal detection control unit has detected a ceasing signal for injection, the urea powder valve 28 and the water valve 27 are controlled to be sequentially closed, thereby stopping the injection of urea powder and water.
[0023] When the signal detection control unit has detected a ceasing signal for engine, the head valve 24 is controlled to open, and the gas distribution valve 28 and the water valve 27 are controlled to close, at this time the head valve 22 remains open. A part of the gas enters the water inlet ring groove 8 and the conical surface water spray channel 7 sequentially from the middle interface of the water pipe three-way joint via the gas distribution pipe 34 and discharges the water in the injection apparatus into the exhaust pipe; and the other part enters the urea powder cavity 4 from the middle interface of the powder pipe three-way joint via the gas distributor pipe 34 and discharges the urea powder in the injection apparatus into the exhaust pipe; finally, the gas distribution valve 24 and the head valve 22 are closed.

Claims (4)

Claims
1. A urea injection apparatus for exhaust gas post-treatment of diesel engine, comprising an injection apparatus body (20) having a housing (10) and a powder cavity, the powder cavity being provided with a powder inlet (11) and a powder injection outlet, the powder injection outlet being provided with a needle valve (1);
the housing (10) being sleeved outside of the powder cavity and a conical surface water spray channel (7) is disposed between an outer wall of the powder injection outlet and the housing, a water inlet ring groove (8) being provided between the housing (10) and the powder cavity, the water inlet ring groove (8) being in communication with the conical surface water spray channel (7), and the housing (10) being further provided with a water inlet (5) leading to the water inlet ring groove (8);
further comprising a pressure stabilizing gas source (21), a water tank (25) and a urea tank (30); the regulated gas source (21) being connected with a head pipe (33), the head pipe (33) having a head valve (22); the head pipe (33) being connected to the water tank (25) through a water tank intake pipe (23) and to the urea tank (30) through a urea tank intake pipe (32) respectively, and also connected to the water inlet (5) and the powder inlet (11) through a gas distribution pipe (34) respectively; the gas distribution pipe (34) being provided with a gas distribution valve (24);
the water tank (25) being connected to the water inlet (5) through a water intake pipe (26), the water intake pipe (26) being provided with a water valve (27);
the urea tank (30) being connected to the powder inlet (11) through a urea powder pipe (29), the urea powder pipe (29) being provided with a urea powder valve (28);
and further comprising a signal detection control unit for sending a control signal to the head valve (22), the gas distribution valve (24), the water valve (27), the urea powder valve (28) and the needle valve (1).
2. A urea injection apparatus for exhaust gas post-treatment of diesel engine as claimed in claim 1, characterised in that the urea tank intake pipe (32) is further provided with a drying can (31).
3. A urea injection apparatus for exhaust gas post-treatment of diesel engine as claimed in claim 1, characterised in that the powder cavity is formed by connecting a needle valve base (2) connected to a bottom of a cylindrical partition (6); the needle valve (1) is mounted on the needle valve base (2); the water inlet ring groove (8) is formed by the groove on an outer wall of the partition (6) and the housing (10).
4. A urea injection apparatus for exhaust gas post-treatment of diesel engine as claimed in claim 3, characterised in that a needle valve seal ring (12) is provided between the needle valve (1) and the needle valve base (2), a urea powder seal ring (3) is provided between the needle valve base (2) and the housing (10), and a water seal ring (9) is provided between the partition (6) and the housing (10).
CA3001076A 2015-10-20 2016-10-20 A urea injection apparatus for exhaust post-treatment of diesel engine Expired - Fee Related CA3001076C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN201510686625.2A CN105201603B (en) 2015-10-20 2015-10-20 A kind of urea injection apparatus for diesel exhaust aftertreatment
CN201510686625.2 2015-10-20
PCT/CN2016/102666 WO2017067471A1 (en) 2015-10-20 2016-10-20 Urea injection device used for diesel exhaust after-treatment

Publications (2)

Publication Number Publication Date
CA3001076A1 true CA3001076A1 (en) 2017-04-27
CA3001076C CA3001076C (en) 2018-09-04

Family

ID=54949512

Family Applications (1)

Application Number Title Priority Date Filing Date
CA3001076A Expired - Fee Related CA3001076C (en) 2015-10-20 2016-10-20 A urea injection apparatus for exhaust post-treatment of diesel engine

Country Status (4)

Country Link
CN (1) CN105201603B (en)
CA (1) CA3001076C (en)
GB (1) GB2557157B (en)
WO (1) WO2017067471A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020072152A1 (en) * 2018-10-02 2020-04-09 Cummins Emission Solutions Inc. Systems and methods for dry chemical reductant insertion in after treatment systems

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105201603B (en) * 2015-10-20 2017-05-31 西华大学 A kind of urea injection apparatus for diesel exhaust aftertreatment
CN107587926B (en) * 2017-09-21 2023-08-22 东莞职业技术学院 Efficient purification method and purifier for tail gas of diesel vehicle
US20190234283A1 (en) * 2018-01-31 2019-08-01 International Engine Intellectual Property Company, Llc ENGINE OUT NOx REDUCTION USING ENHANCED DEF
CN112707483A (en) * 2020-11-26 2021-04-27 国网河北省电力有限公司电力科学研究院 Desulfurization waste water treatment spray set of thermal power plant
CN115920629B (en) * 2023-03-15 2023-05-12 烟台盈德精密机械有限公司 Urea injection device for nitrogen oxide conversion

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001007560A (en) * 1999-06-21 2001-01-12 West Electric Co Ltd Waterproof electronics
JP2010007560A (en) * 2008-06-26 2010-01-14 Denso Corp Exhaust emission control device
CN202611818U (en) * 2012-06-13 2012-12-19 安徽艾可蓝节能环保科技有限公司 Air-assisted selective catalytic reduction (SCR) system
CN203130208U (en) * 2013-03-26 2013-08-14 无锡市凯龙汽车设备制造有限公司 Diesel engine selective catalyst reduction injection system
CN203403929U (en) * 2013-07-19 2014-01-22 夏莉 Exhaust purification device used on diesel locomotive
CN103437867A (en) * 2013-08-30 2013-12-11 东风商用车有限公司 Aerodynamic ammonia gas preparation and quantitative injection system
DE102013016235A1 (en) * 2013-10-01 2015-04-02 Deutz Aktiengesellschaft Exhaust system for diesel vehicles
CN203685356U (en) * 2013-10-17 2014-07-02 刘观柏 Ammonium bicarbonate wet-method-ammonia-production and metered-injection system for engine SCR (Selective Catalytic Reduction)
CN103741938B (en) * 2014-01-13 2016-01-06 北京科技大学 The method of the quick wet shot of a kind of dry powder
CN204003018U (en) * 2014-07-03 2014-12-10 中国重汽集团济南动力有限公司 A kind of heavy goods vehicles catalytic convention design
CN205135760U (en) * 2015-10-20 2016-04-06 西华大学 A urea injection apparatus for diesel engine exhaust aftertreatment
CN105201603B (en) * 2015-10-20 2017-05-31 西华大学 A kind of urea injection apparatus for diesel exhaust aftertreatment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020072152A1 (en) * 2018-10-02 2020-04-09 Cummins Emission Solutions Inc. Systems and methods for dry chemical reductant insertion in after treatment systems
GB2591678A (en) * 2018-10-02 2021-08-04 Cummins Emission Solutions Inc Systems and methods for dry chemical reductant insertion in after treatment systems
GB2591678B (en) * 2018-10-02 2022-11-23 Cummins Emission Solutions Inc Systems and methods for dry chemical reductant insertion in aftertreatment systems
US11708779B2 (en) 2018-10-02 2023-07-25 Cummins Emission Solutions Inc. Systems and methods for dry chemical reductant insertion in aftertreatment systems

Also Published As

Publication number Publication date
GB2557157A8 (en) 2018-06-27
CA3001076C (en) 2018-09-04
CN105201603B (en) 2017-05-31
WO2017067471A1 (en) 2017-04-27
GB201805167D0 (en) 2018-05-16
GB2557157B (en) 2018-12-26
CN105201603A (en) 2015-12-30
GB2557157A (en) 2018-06-13

Similar Documents

Publication Publication Date Title
CA3001076C (en) A urea injection apparatus for exhaust post-treatment of diesel engine
CN110541776B (en) Water mixing control method for natural gas water mixing combustion engine
CN109882270B (en) Internal combustion engine nitrogen oxide emission closed-loop control system for in-cylinder ionic current and urea injection
CN103114916A (en) EGR (exhaust gas recirculation) control system
WO2016066029A1 (en) Device and method for adjusting and controlling actual amount of supply of urea entering an exhaust system
CN201314256Y (en) Direct-injection gas engine in cylinder
CN103437868A (en) Ammonia gas preparation and fixed quantification injection system for SCR reaction
CN204402628U (en) A kind of circulating water cooling type urea injection device for SCR exhaust gas aftertreatment system
CN105358807A (en) Engine control device
CN108571392A (en) Lean-burn systems and method for spark-ignition engine
CN114382578A (en) Control apparatus for controlling hydrogen content of exhaust gas of internal combustion engine
CN111197532A (en) Hydrogen/methanol composite fuel engine
CN204239030U (en) A kind of self-loopa cooling type urea injection device for SCR exhaust gas aftertreatment system
CN203383886U (en) Secondary air jetting device for engine
CN214741734U (en) High-pressure and pressure-stabilizing injection system of marine gas engine
CN106246416B (en) A kind of alcohol using engine exhaust heat-hydrogen dynamical system
JPH05195801A (en) Method and device for reducing discharge of nitrogen oxide of internal combustion engine
CN107304732A (en) It is a kind of to reduce the water injector of fishing boat double fuel machine DS NOx Est
CN101749136A (en) Direct injection engine in electric control gas cylinder
CN205135760U (en) A urea injection apparatus for diesel engine exhaust aftertreatment
CN107989717A (en) A kind of diesel engine sprayed water outside cylinder
CN205135759U (en) A interior formula urea injection apparatus that mixes for SCR system
CN111102068A (en) Engine lean combustion device, control method, engine and automobile
CN211975212U (en) Water-blended injection system of mixed fuel engine
US20150345354A1 (en) Exhaust aftertreatement system injector and control

Legal Events

Date Code Title Description
EEER Examination request

Effective date: 20180405

MKLA Lapsed

Effective date: 20211020

MKLA Lapsed

Effective date: 20211020