AU2020103469A4 - Detachable device for coupling cyclone type vehicle SCR mixer and nozzle - Google Patents

Detachable device for coupling cyclone type vehicle SCR mixer and nozzle Download PDF

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Publication number
AU2020103469A4
AU2020103469A4 AU2020103469A AU2020103469A AU2020103469A4 AU 2020103469 A4 AU2020103469 A4 AU 2020103469A4 AU 2020103469 A AU2020103469 A AU 2020103469A AU 2020103469 A AU2020103469 A AU 2020103469A AU 2020103469 A4 AU2020103469 A4 AU 2020103469A4
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AU
Australia
Prior art keywords
mixer
urea
shell
nozzle
coupling
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Ceased
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AU2020103469A
Inventor
Yijun Pan
Boxiong SHEN
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Hebei University of Technology
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Hebei University of Technology
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Priority to AU2020103469A priority Critical patent/AU2020103469A4/en
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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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • F01N13/1894—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells the parts being assembled in longitudinal direction
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • 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
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention belongs to the technical field of diesel engine tail gas post-treatment, and relates to a novel detachable device for coupling a cyclone type vehicle SCR mixer and a nozzle. The two ends of the shell are respectively provided with a front flange plate and a rear flange plate, the inside of the shell is provided with a cyclone mixer, and the mixer is of a hollow design and is fixedly connected with the shell. The connecting port of the front flange plate is an air inlet of the device, and the connecting port of the rear flange plate is an air outlet of the device. A urea conveying elbow is arranged between the air inlet and the mixer and is connected with the mixer. A urea nozzle is arranged behind the mixer, and the shell section where the urea nozzle is arranged is designed in a tapered mode. The coupling device is beneficial to urea pyrolysis, can effectively solve the problems of urea crushing, urea crystallization and ammonia distribution uniformity, is convenient to disassemble, and is beneficial for daily maintenance and repair. 1/3 Figures 3 1 4 Flow direction of flue gas 2 Figure 1 Figure 2

Description

1/3
Figures
3
1 4
Flow direction of flue gas
2
Figure 1
Figure 2
Detachable device for coupling cyclone type vehicle SCR mixer and nozzle
TECHNICAL FIELD
[0001] The invention belongs to the technical field of diesel engine tail gas post-treatment, and relates to a detachable device for coupling a cyclone type vehicle SCR mixer and a nozzle.
BACKGROUND
[0002] The traditional SCR (selective catalytic reduction converter) catalyst is characterized in that a urea nozzle is obliquely arranged on an exhaust pipeline through a connecting seat, and the urea injection position is changed and the urea injection performance is changed according to different chassis and different arrangement SCR of the same engine, so that the urea needs to be recalibrated. Meanwhile, the traditional mixer is positioned behind the urea nozzle, so that the urea is easy to crystallize on the mixer, the crystallization is blocked, the flow is deteriorated, and the pressure loss is also caused. At present, a new method to solve the problem of urea crystallization in the integrated spray SCR mixer is to design a reasonable mixer in front of the nozzle to strengthen and improve the turbulence and uniformity of the flow field, so as to enhance the crushing effect of urea and reduce the risk of urea landing on the wall.
SUMMARY
[0003] The invention mainly solves the technical problem of providing a detachable device for coupling a cyclone type vehicle SCR mixer and a nozzle which is beneficial to urea pyrolysis, can effectively solve the problems of poor urea crushing, urea crystallization and uneven distribution of ammonia, is convenient to disassemble, and is beneficial for daily maintenance and repair.
[0004] The technical scheme adopted by the invention is that the detachable device for coupling a cyclone type vehicle SCR mixer and a nozzle is characterized in that the SCR mixer and the nozzle coupling device are combined through an external shell, the two ends of the shell are respectively provided with a front flange plate and a rear flange plate, the cyclone mixer is arranged in the shell, the mixer is of a hollow design and is fixedly connected with the shell, a connecting port of the front flange plate is an air inlet of the device, and a connecting port of the rear flange plate is an air outlet of the device. A urea conveying elbow is arranged between the air inlet and the mixer, which is connected with the mixer. The urea nozzle is set behind the mixer, and the shell section where the urea nozzle is located is of gradual shrinking design. The coupling device is conducive to urea pyrolysis, can effectively solve the problems of urea crushing, urea crystallization and ammonia distribution uniformity, and is beneficial for disassembly and daily maintenance and repair.
[0005] According to the invention, one end of the urea conveying elbow penetrates out from the wall surface and is connected with the pump, and the other end of the urea conveying elbow is connected with the cyclone mixer. Due to the thin-walled design of the elbow, the heat transfer between the urea and the incoming high-temperature flue gas is conducive to urea pyrolysis.
[0006] According to the present invention, the cyclone type mixer is arranged at 6-10 mm in front of the injection direction of the urea nozzle. The problem of urea low-temperature crystallization on the mixer can be effectively solved.
[0007] According to the invention, the cyclone type mixer is fixed on the shell through blade welding, the front middle part of the blade is rectangular, and the tail part of the blade is of a trapezoidal convergence type design. When the speed of flue gas is low, the flue gas sweeps the trapezoidal structure at the tail part of the blade, and two longitudinal eddies with steady state and reverse states and transient hairpin eddies accompanying the longitudinal eddies are formed at the back surface of the trapezoidal tail part, so that the urea crushing effect is ensured. When the speed of the flue gas is high, the cyclone structure can effectively conduct flow field organization, generate eddies to obtain good urea crushing effect, and ensure uniform distribution of ammonia.
[0008] According to the present invention, 6-14 blades of the cyclone type mixer are preferable, the included angle between the blades and the axis of the mixer is preferably 15-50 degrees, and all the blades adopt a uniform inclination angle and are uniformly distributed along the circumferential direction of the mixer.
[0009] According to the invention, the urea nozzle is arranged at the downstream of the mixer, and the nozzle is located in a turbulent flow active area, so that a better urea crushing effect can be obtained, the urea and incoming flue gas are fully mixed, and deposition is reduced.
[0010] According to the invention, the convergence section of the shell can improve the flow rate of the flue gas, and the higher axial speed enables the urea spray to flow through the outlet pipe section more quickly, thereby effectively reducing the risk of urea sticking to the wall and reducing the deposition.
[0011] According to the invention, the shell inlet and outlet are connected into the SCR system of the automobile through the front flange and the rear flange, wherein the air inlet is connected with the exhaust pipe of the diesel engine through the flange, and the air outlet is connected with the SCR reactor through the flange.
[0012] According to the invention, an annular groove is arranged on the flange plate, and a sealing ring is arranged in the groove; and because the whole device is in a negative pressure working state, the sealing ring design can effectively prevent the leakage of flue gas and ammonia and ensure the safety of personnel near the equipment.
[0013] The method has the beneficial effects that the method can optimize the urea spraying effect, prevent urea from crystallizing, realize uniformly pyrolysis of the urea, and further improve the deNOx efficiency of the catalyst.
BRIEF DESCRIPTION OF THE FIGURES
[0014] Figure 1 is a sectional view in the axial direction of the present invention.
[0015] The drawing is marked as: 1, a urea conveying elbow; 2, an inlet flange and a sealing ring; 3, a shell contraction section; 4, a cyclone mixer; 5, an outlet flange and a sealing ring; and 6, a urea nozzle.
[0016] Figure 2 is a sectional view showing a mixer part in the device in the direction of the blade.
[0017] Figure 3 is a front view of the device.
[0018] Figure 4 is a left cross-sectional view of the device.
Figure 5 is a view diagram of the device in the exit direction.
DESCRIPTION OF THE INVENTION
[0020] Specific embodiments of the present invention will be further described below with reference to the accompanying drawings.
[0021] In Figures 1-5, the device comprises a urea conveying elbow 1, an inlet flange and a sealing ring 2, a shell contraction section 3, a cyclone mixer 4, an outlet flange and a sealing ring 5, and a urea nozzle 6.
[0022] As shown in Figures 1-5, the present invention relates to a detachable device for coupling a cyclone type vehicle SCR mixer and a nozzle, which comprises a shell, wherein an inlet flange and a sealing ring 2, an outlet flange and a sealing ring 5 are respectively arranged at two ends of the shell, a cyclone type mixer 4 is arranged in the shell, the mixer is of a hollow design and is fixedly connected with the shell, a urea conveying elbow 1 is arranged between an air inlet and the mixer 4, one end of the elbow 1 passes through the shell and is connected with a pump, the other end of the elbow 1 is connected with the mixer 4, a urea nozzle 6 is arranged behind the mixer 4, and the urea nozzle 6 is a shell contraction section 3.
[0023] The housing constriction 3 acts as an acceleration of the airflow.
[0024] The cyclone type mixer 4 is fixed on the housing by welding to realize rotation of an air flow.
[0025] In Figure 2, the mixer blade is a straight blade, the front middle part of the blade is rectangular, and the tail part is of converged design.
When the speed of the flue gas is low, the flue gas outwards sweeps the trapezoidal structure at the tail part of the blade, and two longitudinal eddies with steady state and reverse states and transient hairpin eddies accompanying the longitudinal eddies are formed at the back surface of the trapezoidal tail part, so that the urea crushing effect is ensured. When the flue gas speed is high, the cyclone structure can effectively carry out flow field organization to generate eddies to obtain good urea crushing effect and ensure uniform distribution of ammonia. The special blade design can ensure the mixing effect at a wider flue gas flow rate. The number of the blades is preferably 6-14, the included angle between the blades and the central axis is preferably 15-50 degrees, and all the blades need to be uniformly inclined and uniformly distributed.
[0026] The working process of the invention is as follows: in engine exhaust emission, by the invention, firstly contacting the urea conveying elbow 1 through the shell, heating the urea conveying elbow 1, and further preheating the urea in the elbow, so as to optimize the pyrolysis process of the urea and prevent crystallization. The airflow passing through the elbow 1 enters the cyclone mixer 4 and then passes through the shell contraction section 3, so that the airflow is accelerated, the accelerated rotary airflow can reduce the risk of urea sticking to the wall in the mixed air, and also can accelerate the evaporation of the urea liquid film. After urea is ejected from urea nozzle 6 and mixed with the accelerated rotating inflow, the breakage of urea droplet can be further enhanced, and the urea dispersion can be more uniform, thus improving the uniformity of ammonia distribution of urea on the carrier end face.
[0027] By adopting the technical scheme of the invention, the mixing degree of the exhaust gas and the urea spray can be improved, the uniformity is higher before the exhaust gas and the urea spray enter the SCR catalyst, the conversion efficiency of the nitrogen oxide can be improved, and the emission of the nitrogen oxide can be reduced. Due to the preheating and swirling effect of the invention on urea, the formation of urea crystallization can be reduced, and the problem of high pressure drop will not be generated.
[0028] All equivalent structures or equivalent flow changes made using the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, are equally included within the scope of the present invention.

Claims (8)

Claims
1. A detachable device for coupling a cyclone type vehicle SCR mixer and a nozzle, wherein: device for coupling the SCR mixer and the nozzle is combined through an external shell, an inlet flange and a sealing ring (2), an outlet flange and a sealing ring (5) are respectively arranged at two ends of the shell, a cyclone type mixer (4) is arranged in the shell, the mixer is of a hollow design and is fixedly connected with the shell, a urea conveying elbow (1) is arranged between an air inlet and the mixer (4), one end of the elbow (1) passes through the shell and is connected with a pump, the other end of the elbow 1 is connected with the mixer (4), a urea nozzle (6) is arranged behind the mixer (4), and the urea nozzle (6) is a shell contraction section (3).
2. The detachable device for coupling the cyclone type vehicle SCR mixer and the nozzle according to claim 1, wherein one end of the urea conveying elbow passes through the wall surface and is connected with the pump, and the other end of the urea conveying elbow is connected with the cyclone type mixer.
3. The detachable device for coupling the cyclone type vehicle SCR mixer and the nozzle according to claim 1, wherein the cyclone type mixer is arranged at a position which is 6-10 mm in front of the injection direction of the urea nozzle.
4. The detachable device for coupling the cyclone type vehicle SCR mixer and the nozzle according to claim 1, wherein the rotational flow type mixer blades are fixed on the shell by welding, and the trailing edge of the blades is of convergent design.
5. The detachable device for coupling the cyclone type vehicle SCR mixer and the nozzle according to claim 1, wherein 6-14 blades of the rotational flow type mixer are preferably arranged, the included angle between the blades and the axis of the mixer is preferably 15-50 degrees, and all the blades are subject to a uniform inclination angle and are uniformly distributed along the circumferential direction of the mixer.
6. The detachable device for coupling the cyclone type vehicle SCR mixer and the nozzle according to claim 1, wherein the housing convergence section can increase the flow rate of flue gas.
7. The detachable device for coupling the cyclone type vehicle SCR mixer and the nozzle according to claim 1, wherein an inlet and an outlet of the shell are connected into an SCR system of the vehicle through a front flange and a rear flange, an air inlet is connected with an exhaust pipe of a diesel engine through a flange, and an air outlet is connected with an SCR reactor through a flange.
8. The detachable device for coupling the cyclone type vehicle SCR mixer and the nozzle according to claim 1, wherein the flange is provided with an annular groove, and a sealing ring is arranged in the annular groove.
AU2020103469A 2020-11-16 2020-11-16 Detachable device for coupling cyclone type vehicle SCR mixer and nozzle Ceased AU2020103469A4 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112855315A (en) * 2021-02-05 2021-05-28 无锡亿利环保科技有限公司 SCR urea mixer
CN114382571A (en) * 2022-01-27 2022-04-22 无锡威孚力达催化净化器有限责任公司 Layering crushing urea mixing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112855315A (en) * 2021-02-05 2021-05-28 无锡亿利环保科技有限公司 SCR urea mixer
CN114382571A (en) * 2022-01-27 2022-04-22 无锡威孚力达催化净化器有限责任公司 Layering crushing urea mixing device

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