CN113107651A - SCR urea mixer - Google Patents

SCR urea mixer Download PDF

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Publication number
CN113107651A
CN113107651A CN202110502762.1A CN202110502762A CN113107651A CN 113107651 A CN113107651 A CN 113107651A CN 202110502762 A CN202110502762 A CN 202110502762A CN 113107651 A CN113107651 A CN 113107651A
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CN
China
Prior art keywords
air inlet
flow
urea
mixer
air outlet
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Pending
Application number
CN202110502762.1A
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Chinese (zh)
Inventor
张流俊
陈启章
唐国海
钱云寿
黄涛
肖宇刚
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Sinocat Environmental Technology Co Ltd
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Sinocat Environmental Technology Co Ltd
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Publication date
Application filed by Sinocat Environmental Technology Co Ltd filed Critical Sinocat Environmental Technology Co Ltd
Priority to CN202110502762.1A priority Critical patent/CN113107651A/en
Publication of CN113107651A publication Critical patent/CN113107651A/en
Pending 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
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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

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

Abstract

The invention discloses an SCR urea mixer. Comprises a spiral mixing cavity at the front end and a flow equalizing cavity at the rear end; the spiral mixing chamber comprises an air inlet end face plate, an air outlet end face plate and a spiral rotational flow guide plate, the guide plate forms an air flow channel which is formed by an air inlet and is in a convergence type towards an air outlet vortex, turbulence strips are arranged in the channel, a flow distribution plate is transversely arranged along the urea solution spraying direction path, and a flow distribution disc is radially arranged in the flow distribution chamber along the barrel. The mixer disclosed by the invention realizes rapid and sufficient atomization and pyrolysis of the urea aqueous solution by distributing and guiding the hot tail gas flow and strongly crushing and atomizing the urea aqueous solution; the mixed gas flows at a high speed in the spiral vortex convergence type airflow channel, so that uniform and sufficient mixing is realized; the turbulent flow strip distributes, guides, crushes and disturbs the mixed and high-speed flowing hot air flow; the flow equalizing disc distributes and guides high-speed rotational flow entering the rear cavity of the mixer through the air outlet, and the conversion rate of ammonia is greatly improved.

Description

SCR urea mixer
Technical Field
The invention designs an SCR urea mixer, relates to the hot tail gas aftertreatment technology of a diesel internal combustion engine, and particularly relates to an SCR urea mixer of a hot tail gas aftertreatment system of the diesel internal combustion engine.
Background
With the increasing environmental protection importance of the country and the implementation of the VI emission regulations of diesel internal combustion engines, urea is widely adopted in the hot tail gas aftertreatment system of the diesel internal combustion engine to reduce and reduce NO in the hot tail gasXNamely the SCR technique; the SCR technology is a technology for realizing tail gas aftertreatment purification by applying a selective catalytic reduction chemical principle, and can effectively reduce the emission of NOx of a diesel engine and reach the emission standard. During the working process of the SCR treatment system, hydrolysis needs to be realized after urea aqueous solution is sprayed, and ammonia gas can be generated to react with NO in hot tail gas discharged by an internal combustion engineXThe reaction takes place. The hydrolysis of urea is mainly realized by a static SCR mixer at present, but the SCR mixer adopted at present is insufficient for urea hydrolysis, so that NO in hot tail gas cannot be effectively reducedXFurther, there is a problem that a large amount of urea crystals are generated in the deconstruction interior of the SCR mixer and on the front end surface of the SCR catalyst.
Disclosure of Invention
Aiming at the problems and design defects in the SCR urea mixer technology for the post-treatment system of the existing diesel internal combustion engine, the invention aims to overcome and solve the performance defects of the existing SCR mixer, including the problems of insufficient atomization after urea aqueous solution is sprayed, urea crystallization formation, low ammonia conversion rate and the like.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
SCR urea blender for gaseous tubular structure blender that link up, including setting up in the urea nozzle mount pad of barrel wall, its characterized in that: the mixer of the cylinder structure consists of a spiral mixing cavity at the front end and a flow equalizing cavity at the rear end;
a spiral mixing cavity: comprises an air inlet end panel positioned on the front end surface of the mixing cavity, an air outlet end panel positioned on the rear end surface of the mixing cavity and a spiral rotational flow guide plate between the two panels; the air inlet end panel is provided with an opening, and an air inlet is formed between the opening and the inner wall of the cylinder body and between the opening and the spiral rotational flow guide plate; an air outlet is formed by opening the air outlet end panel; the spiral rotational flow guide plate forms a vortex convergence type air flow channel from the air inlet to the air outlet between the air inlet end face plate and the air outlet end face plate; turbulence strips are uniformly arranged between the air inlet end panel and the air outlet end panel along the axial direction of the cylinder in the airflow channel; the urea nozzle mounting seat is positioned at the rear side of the air inlet, and the urea solution spraying direction is arranged along the radial direction of the cylinder; the inner side of the air inlet is transversely provided with a splitter plate along the path of the urea solution injection direction, one end of the splitter plate is arranged at the inner side of the air inlet to divide the air inlet into two parts, the other end of the splitter plate is arranged on a spiral rotational flow guide plate or the wall of the cylinder, and the surface of the splitter plate is of a barrier structure;
flow equalizing cavity: the rear end of the air outlet end panel and the barrel form a part, a flow equalizing disc is radially arranged in the flow equalizing cavity along the barrel, and flow equalizing blades of a curved surface structure are radially and uniformly and symmetrically arranged on the flow equalizing disc.
The cross section of the turbulence strip is a polygon or a waist-shaped structure with arc edges, and the turbulence strip is arranged in a quincunx group or a cross group.
The surface of the flow distribution plate is provided with a long slit or a porous ventilation structure and is transversely arranged in an arc shape along the spraying direction path of the urea solution.
The flow equalizing blade is a twisted fluid guide vane curved surface structure.
The opening of the air inlet end panel is of a circular, oval, rectangular or trapezoidal structure; the opening of the air outlet end panel is in a circular, oval, rectangular or trapezoidal structure.
And a urea nozzle guard plate is arranged on the inner wall of the cylinder urea nozzle mounting seat.
An air inlet is formed among the cylinder body, the air inlet end panel and the spiral rotational flow guide plate of the mixer; the splitter plate arranged on the mixer is positioned at the air inlet, has the characteristics of a barrier type structure, and distributes and guides airflow to the hot tail gas of the internal combustion engine entering the air inlet; and the urea aqueous solution sprayed by the urea nozzle is crushed and atomized, so that the rapid and sufficient atomization and pyrolysis of the urea aqueous solution are realized.
A vortex convergent airflow channel is formed between the spiral rotational flow guide plate of the mixer and the air inlet end face plate and between the spiral rotational flow guide plate and the air outlet end face plate, and the urea aqueous solution crushed and atomized by the flow distribution plate and the hot tail gas entering from the air inlet flow at a high speed in the vortex convergent airflow channel to perform sufficient and uniform mixing, so that the beneficial effect of high urea conversion rate is realized, and the problem of urea crystallization under the working condition of low temperature and low load is solved.
The turbulence strip of the mixer is arranged in a spiral vortex convergent airflow channel formed between the spiral vortex flow deflector and the air inlet end surface plate and the air outlet end surface plate, and distributes, guides, disturbs and crushes mixed and high-speed flowing hot airflow in the spiral vortex convergent airflow channel.
The flow equalizing disc of the mixer is positioned in the rear cavity of the SCR urea mixer; the vortex convergence type airflow channel is internally mixed with hot airflow which is sufficiently uniform and flows at a high speed, the hot airflow enters the rear cavity of the mixer through the air outlet, a high-speed hot rotational flow is formed in the rear cavity, and then the hot airflow passes through the flow equalizing disc and reaches the front end face of the SCR catalyst.
Compared with the prior SCR urea mixer, the SCR urea mixer has the following beneficial effects:
(1) the SCR urea mixer disclosed by the invention can realize rapid and sufficient atomization and pyrolysis of the urea aqueous solution by distributing and guiding the hot tail gas flow and strongly crushing and atomizing the urea aqueous solution sprayed by the urea nozzle.
(2) A spiral vortex convergent airflow channel is formed among the spiral vortex flow guide plate, the air inlet end face plate and the air outlet end face plate in the SCR urea mixer, and urea aqueous solution is quickly and fully atomized and pyrolyzed and then flows at a high speed with hot tail gas entering through the air inlet in the spiral vortex convergent airflow channel to realize uniform and full mixing.
(3) In the SCR urea mixer, the vortex flow bars in the vortex convergence type airflow channel formed among the spiral rotational flow guide plate, the air inlet end surface plate and the air outlet end surface plate distribute, guide, crush and disturb hot airflow which is mixed and flows at high speed.
(4) The flow equalizing disc in the rear cavity of the SCR urea mixer distributes and guides high-speed rotational flow entering the rear cavity of the mixer through the air outlet; the hot air flow which penetrates through the flow equalizing disc and reaches the front end face of the SCR catalyst has excellent ammonia nitrogen mixing effect and molar ratio uniformity, greatly improves the conversion rate of ammonia, and solves the problem of urea crystallization under the working condition of low temperature and low load.
Drawings
FIG. 1 is a front view of an SCR urea mixer of the present invention;
FIG. 2 is a schematic view of the SCR mixer of the intake end panel of FIG. 1;
FIG. 3 is an axial front view of the SCR urea mixer of FIG. 2
FIG. 4 is an enlarged view of a portion of the SCR urea mixer of FIG. 3;
FIG. 5 is an isometric view of the SCR urea mixer of FIG. 1 with the cartridge removed;
FIG. 6 is an isometric view of the SCR urea mixer configuration of FIG. 1;
FIG. 7 is a rear view of the SCR urea mixer of FIG. 5.
The attached drawings are marked as follows:
1-cylinder, 2-urea nozzle mounting seat, 3-air inlet end panel, 4-spiral rotational flow guide plate, 5-splitter plate, 6-urea nozzle guard plate, 7-air outlet end panel, 8-air outlet, 9-turbulence strip, 10-flow equalizing disc, 100A-air inlet and 101-flow equalizing blade.
Detailed Description
The present invention is further described below in conjunction with the following detailed description, which is intended to further illustrate the principles of the invention and is not intended to limit the invention in any way, but is equivalent or analogous to the present invention without departing from its scope.
The specific structure of the SCR urea mixer according to the present embodiment will be described and illustrated with reference to fig. 1 to 7.
FIG. 1 is a front view of the SCR urea mixer configuration given in this example. The SCR urea mixer includes barrel 1, installs urea nozzle mount pad 2 on the barrel 1 outer wall, arranges the terminal surface board 3 of giving vent to anger in the inlet end panel 3 of SCR urea mixer front end and rear end 7.
The axial air inlet 100A of the SCR urea mixer is formed by a cylinder 1, an air inlet end panel 3 and a spiral rotational flow guide plate 4.
Fig. 2 is a schematic view of the SCR mixer structure after the intake end panel 3 is removed in fig. 1. A nozzle guard plate 6 and a splitter plate 5 are arranged below the urea nozzle mounting seat 2; the flow distribution plate 5 is located at the position where the urea enters the air inlet 100A and has a grid type structure characteristic, the grid type structure is transversely arranged along the urea solution injection path, the air flow distribution and flow guide are carried out on the hot tail gas of the diesel internal combustion engine entering the air inlet 100A, and meanwhile, the grid type structure is used for crushing and atomizing the urea solution injected by the urea nozzle. A spiral swirl guide plate 4 is arranged between the air inlet end face plate 3 (not shown) and the rear air outlet end face plate 7, and forms a spiral vortex convergent airflow channel with the air inlet end face plate 3 and the air outlet end face plate 7, and the urea aqueous solution crushed and atomized by the flow distribution plate 5 and the hot tail gas entering from the air inlet 100A flow at a high speed in the spiral vortex convergent airflow channel to be uniformly and fully mixed.
As shown in the figure, a plurality of spoiler strips 9 are arranged on an airflow flow path of a spiral vortex convergence type airflow channel formed by spiral type rotational flow deflectors to distribute, guide, disturb and crush hot airflow flowing at a high speed in the channel.
Fig. 3 is an axial front view of the SCR urea mixer of fig. 2, the inlet end plate 3 not being shown. The flow distribution plate 5 located at the position of the inlet 100A distributes and guides the air flow of the hot tail gas of the internal combustion engine entering the inlet 100A, and crushes and atomizes the urea water solution sprayed by the urea nozzle. The hot tail gas and the urea aqueous solution sprayed out by the nozzle are mixed and then flow at a high speed in a spiral vortex convergence type airflow channel formed by the spiral vortex guide plate 4, are fully and uniformly mixed under the further distribution, flow guide, disturbance and crushing action of the turbulence strips 9, then flow out through an air outlet 8 on an air outlet end face plate 7, enter a rear cavity of the SCR urea mixer, and form a high-speed hot vortex in the rear cavity.
FIG. 4 is an enlarged view of a portion of the SCR urea mixer of FIG. 3. A urea nozzle guard plate 6 is arranged below the urea nozzle mounting seat 2 arranged on the outer wall surface of the cylinder body 1; a flow distribution plate 5 with a grid structure characteristic is arranged below the urea nozzle protective cover plate 6, is positioned at the air inlet of the air inlet 100A, distributes and guides air flow to the hot tail gas of the internal combustion engine entering the air inlet 100A, and crushes and atomizes the urea water solution sprayed by the urea nozzle. The plurality of turbulence strips 9 are arranged in the spiral vortex convergence type airflow channel, and distribute, guide, crush and stir the high-speed flowing hot airflow after mixing in the spiral vortex convergence type airflow channel.
FIG. 5 is an isometric view of the SCR urea mixer of FIG. 1 with the cartridge removed; a urea nozzle guard plate 6 is arranged below the urea nozzle mounting seat 2 arranged on the outer wall surface of the cylinder body 1, a flow distribution plate 5 with a grid type structure characteristic is arranged below the urea nozzle guard plate 6 and at the inlet of the air inlet 100A, and is used for distributing and guiding air flow of the hot tail gas of the internal combustion engine entering the air inlet 100A (not shown) and crushing and atomizing the urea water solution sprayed by the urea nozzle. An axial air inlet 100A (not shown) is formed between the inner wall surface of the cylinder 1, the air inlet end surface plate 3 and the rear air outlet end surface plate 7 and the spiral rotational flow guide plate 4. In the rear end flow equalizing cavity of the SCR urea mixer, a flow equalizing disc 10 is provided, which comprises a plurality of flow equalizing blades 101 which are arranged in an annular array and in a radial direction and have a curved surface structure.
Fig. 6 is a schematic axial side structure diagram of the SCR mixer in fig. 1, in which an axial air inlet 100A is formed between the inner wall surface of the cylinder 1, the air inlet end plate 3, the air outlet end plate 7 at the rear end, and the spiral swirl flow guide plate 4; below the urea nozzle mount 2 is a urea nozzle guard plate 6, and a splitter plate 5 having a barrier-like structural feature is located at the inlet of the air inlet 100A and below the urea nozzle guard plate 6.
FIG. 7 is a rear view of the SCR urea mixer of FIG. 5. After hot tail gas of the diesel internal combustion engine enters through an air inlet 100A formed by the cylinder 1, the air inlet end panel 3 and the spiral rotational flow guide plate 4, the hot tail gas is subjected to diversion and flow guide of hot air flow by the flow distribution plate 5 at the inlet, mixed with urea water solution sprayed by the urea water solution nozzle, and flows at a high speed in a spiral convergence type air flow channel formed by the spiral rotational flow guide plate 4, and uniform and sufficient mixing is performed. At the spiral vortex formed by the spiral type swirl flow guide plate 4The spiral convergence type air flow channel path is provided with a plurality of turbulence strips 9, hot air which flows at a high speed after being mixed in the air flow channel is distributed, guided, crushed and stirred, then enters a rear-end flow equalizing cavity of the SCR urea mixer through an air outlet 8, forms a high-speed rotational flow in the rear-end flow equalizing cavity, and then passes through a flow equalizing disc 10 formed by a plurality of annular array flow equalizing blades 101; the flow equalizing blade 101 further stirs and equalizes the flow of the ammonia gas hot tail gas in the rear cavity of the SCR urea mixer in a high-speed rotational flow manner, the ammonia gas hot tail gas is conveyed to the front end face of the inlet of the SCR catalyst and enters the SCR catalyst to carry out selective catalytic reduction chemical reaction, and therefore NO in the hot tail gas of the diesel internal combustion engine is eliminatedXAnd meets the requirements of national VI emission standards.
In the embodiment of the invention, the air inlet 100A on the air inlet end plate 3 and the air outlet 8 on the air outlet end plate 7 in the SCR urea mixer can be in any geometric shape such as a circle, an ellipse, a rectangle, a trapezoid and the like, and are not limited by the structural schematic in the above-described SCR urea mixer embodiment.

Claims (5)

  1. SCR urea mixer, the tubular structure blender that for gaseous link up, including setting up in the urea nozzle mount pad of barrel wall, its characterized in that: the mixer of the cylinder structure consists of a spiral mixing cavity at the front end and a flow equalizing cavity at the rear end;
    a spiral mixing cavity: comprises an air inlet end panel positioned on the front end surface of the mixing cavity, an air outlet end panel positioned on the rear end surface of the mixing cavity and a spiral rotational flow guide plate between the two panels; the air inlet end panel is provided with an opening, and an air inlet is formed between the opening and the inner wall of the cylinder body and between the opening and the spiral rotational flow guide plate; an air outlet is formed by opening the air outlet end panel; the spiral rotational flow guide plate forms a vortex convergence type air flow channel from the air inlet to the air outlet between the air inlet end face plate and the air outlet end face plate; turbulence strips are uniformly arranged between the air inlet end panel and the air outlet end panel along the axial direction of the cylinder in the airflow channel; the urea nozzle mounting seat is positioned at the rear side of the air inlet, and the urea solution spraying direction is arranged along the radial direction of the cylinder; the inner side of the air inlet is transversely provided with a splitter plate along the path of the urea solution injection direction, one end of the splitter plate is arranged at the inner side of the air inlet to divide the air inlet into two parts, the other end of the splitter plate is arranged on a spiral rotational flow guide plate or the wall of the cylinder, and the surface of the splitter plate is of a barrier structure;
    flow equalizing cavity: the rear end of the air outlet end panel and the barrel form a part, a flow equalizing disc is radially arranged in the flow equalizing cavity along the barrel, and flow equalizing blades of a curved surface structure are radially and uniformly and symmetrically arranged on the flow equalizing disc.
  2. 2. The SCR urea mixer of claim 1, wherein: the cross section of the turbulence strip is a polygon or a waist-shaped structure with arc edges, and the turbulence strip is arranged in a quincunx group or a cross group.
  3. 3. The SCR urea mixer of claim 1, wherein: the surface of the flow distribution plate is provided with a long slit or a porous ventilation structure and is transversely arranged in an arc shape along the spraying direction path of the urea solution.
  4. 4. The SCR urea mixer of claim 1, 2, or 3, wherein: the flow equalizing blade is a twisted fluid guide vane curved surface structure.
  5. 5. The SCR urea mixer of claim 4, wherein: the opening of the air inlet end panel is of a circular, oval, rectangular or trapezoidal structure; the opening of the air outlet end panel is in a circular, oval, rectangular or trapezoidal structure.
CN202110502762.1A 2021-05-09 2021-05-09 SCR urea mixer Pending CN113107651A (en)

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CN202110502762.1A CN113107651A (en) 2021-05-09 2021-05-09 SCR urea mixer

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Application Number Priority Date Filing Date Title
CN202110502762.1A CN113107651A (en) 2021-05-09 2021-05-09 SCR urea mixer

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023115725A1 (en) * 2021-12-21 2023-06-29 潍柴动力股份有限公司 Scr mixer and vehicle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108457727A (en) * 2018-04-19 2018-08-28 凯德斯环保科技（苏州）有限公司 SCR urea mixers
KR101950601B1 (en) * 2017-09-11 2019-02-22 대지금속 주식회사 Mixing chamber unit for exhaust gas cleaning device
CN109653846A (en) * 2019-01-10 2019-04-19 北京康纳利亚环保科技有限公司 A kind of mixing arrangement for motor exhaust after-treatment system
CN109653843A (en) * 2018-12-23 2019-04-19 中自环保科技股份有限公司 A kind of diesel engine after-treatment system SCR urea mixer
CN209212351U (en) * 2018-11-28 2019-08-06 无锡市杜克环保科技有限公司 A kind of high efficiency urea fluidized bed mixer in tail gas clean-up

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101950601B1 (en) * 2017-09-11 2019-02-22 대지금속 주식회사 Mixing chamber unit for exhaust gas cleaning device
CN108457727A (en) * 2018-04-19 2018-08-28 凯德斯环保科技（苏州）有限公司 SCR urea mixers
CN209212351U (en) * 2018-11-28 2019-08-06 无锡市杜克环保科技有限公司 A kind of high efficiency urea fluidized bed mixer in tail gas clean-up
CN109653843A (en) * 2018-12-23 2019-04-19 中自环保科技股份有限公司 A kind of diesel engine after-treatment system SCR urea mixer
CN109653846A (en) * 2019-01-10 2019-04-19 北京康纳利亚环保科技有限公司 A kind of mixing arrangement for motor exhaust after-treatment system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023115725A1 (en) * 2021-12-21 2023-06-29 潍柴动力股份有限公司 Scr mixer and vehicle

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Application publication date: 20210713