CN109441603B - Packaging system between DPF and SCR in tail gas aftertreatment - Google Patents

Packaging system between DPF and SCR in tail gas aftertreatment Download PDF

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Publication number
CN109441603B
CN109441603B CN201811607194.6A CN201811607194A CN109441603B CN 109441603 B CN109441603 B CN 109441603B CN 201811607194 A CN201811607194 A CN 201811607194A CN 109441603 B CN109441603 B CN 109441603B
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plate
arc
transition
scr
rectification
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CN201811607194.6A
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CN109441603A (en
Inventor
王启琛
冯坦
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Dongfeng Commercial Vehicle Co Ltd
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Dongfeng Commercial Vehicle Co Ltd
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Priority to CN201811607194.6A priority Critical patent/CN109441603B/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
    • F01N13/009—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 having two or more separate purifying devices arranged in series
    • F01N13/0097—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 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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]
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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

The utility model provides a locate in encapsulation system between DPF, SCR in tail gas aftertreatment, the transition portion that sets up in DPF input, SCR output in it includes transition shell and the transition chamber in it, transition shell includes transition front bezel, transition back bezel and the transition side wall that presss from both sides therebetween, the front bezel goes into, the export has been seted up respectively to the top of transition front bezel, the bottom, the position of the nearly front bezel entry in transition chamber is provided with ammonia generating element, ammonia generating element's below is provided with vertical rectification unit, this vertical rectification unit communicates with each other with the horizontal rectification unit that sets up in the SCR output, ammonia generating element includes the water conservancy diversion panel, arc breaker and water conservancy diversion bent plate, the water conservancy diversion panel card is established in the front bezel entry, arc breaker, water conservancy diversion bent plate presss from both sides before the transition, between the back plate. The design is not only provided with a mixer additionally, but also has a good ammonia generating effect, and the rectification design is provided, so that the SCR reduction reaction effect can be improved.

Description

Packaging system between DPF and SCR in tail gas aftertreatment
Technical Field
The invention relates to a packaging design for tail gas aftertreatment, belongs to the technical field of engine tail gas purification, and particularly relates to a packaging system between a DPF and an SCR in tail gas aftertreatment, which is particularly suitable for improving ammonia gas generation effect on the basis of no need of additionally arranging a mixer, and can improve SCR reduction reaction effect by being provided with a rectification design.
Background
Selective catalytic reduction (Selective Catalytic Reduction, SCR) refers to the treatment of exhaust gas to meet emission standards by reducing NOx to N2 using ammonia, aqueous ammonia, urea or hydrocarbons as a reductant. In the prior art, it is necessary to treat engine exhaust to produce Nox mainly comprising ammonia, and then send the Nox to an SCR catalyst device for SCR reduction.
The invention patent application with the application publication number of CN108194176A and the application publication date of 2018, 6 and 22 discloses a U-shaped mixer device for a square box structure, which comprises a DPF particle supplementary unit, a mixer air inlet end cover, a mixer air outlet end cover, a square box platform partition board, a urea injection base and a mixer device, wherein the mixer device comprises a mixer upper end cover, a mixer barrel, a mixer cyclone tube, a mixer partition board, a mixer support board and a mixer lower end cover, the mixer upper end cover is arranged at the upper end of the mixer barrel, the lower end of the mixer barrel is connected with the mixer lower end cover, an installation cavity of the mixer device is formed by the mixer upper end cover, the mixer cyclone tube is arranged in the installation cavity, and the mixer partition board is arranged at the lower end of the mixer cyclone tube. While this design is capable of treating engine exhaust to produce ammonia, it still has the following drawbacks:
firstly, the design of the special single mixer device for treating the incoming exhaust gas not only requires additional manufacturing and increases the application cost, but also requires providing additional assembly space and increases the assembly difficulty;
secondly, the design divides the installation cavity into a first mixing cavity and a second mixing cavity which are arranged up and down through the partition board, the mixer swirl tube arranged in the first mixing cavity divides the entering tail gas into two parts, wherein the tail gas passing through the mixer swirl tube reacts with urea in the first mixing cavity, the tail gas passing around the mixer swirl tube only carries out secondary mixing and reaction with the mixed gas passing through the mixer swirl tube in the second mixing cavity, and the design can not only improve the coverage range of urea, but also can not enhance the mixing degree of the tail gas and urea, so that the ammonia gas generating effect is poor;
again, the ammonia gas generated in this design, after being generated, does not have a corresponding rectification design, but directly enters the SCR catalyst device to perform the SCR reduction reaction, which not only results in uneven concentration of the entering ammonia gas, but also uneven air flow speed, thereby reducing the SCR reduction reaction effect.
The disclosure of this background section is only intended to increase the understanding of the general background of the present patent application and should not be taken as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to overcome the defects and problems of the prior art that a mixer is required to be additionally arranged, the ammonia generating effect is poor, the rectification design is lacked, and the SCR reduction reaction effect is poor, and provides a packaging system which is arranged between a DPF and an SCR in the tail gas aftertreatment and has the advantages of no need of additionally arranging the mixer, good ammonia generating effect, rectification design and good SCR reduction reaction effect.
In order to achieve the above object, the technical solution of the present invention is: the packaging system comprises a DPF input end, an SCR output end and a transition part, wherein one end of the transition part is communicated with a DPF particle trapping device through the DPF input end, and the other end of the transition part is communicated with an SCR catalyst device through the SCR output end;
the transition part comprises a transition shell and a transition cavity arranged in the transition shell, the transition shell comprises a transition front plate, a transition rear plate and a ring-shaped transition side wall clamped between the transition front plate and the transition rear plate, a front plate inlet communicated with the DPF input end is formed in the top of the transition front plate, a front plate outlet communicated with the SCR output end is formed in the bottom of the transition front plate, and the DPF input end, the transition part and the SCR output end form a horizontal U-shaped structure;
an ammonia gas generating unit is arranged at a position in the transition cavity near the inlet of the front plate, a vertical rectifying unit is arranged in a position in the transition cavity below the ammonia gas generating unit, and the vertical rectifying unit is communicated with a horizontal rectifying unit arranged in the SCR output end;
the ammonia gas generating unit comprises a flow guide panel, an arc breaker and a flow guide bent plate, wherein the flow guide panel is clamped in a front plate inlet, the arc breaker and the flow guide bent plate are arranged at the position, close to the front plate inlet, in the transition cavity, of the transition cavity, the arc breaker and the flow guide bent plate are clamped between the transition front plate and the transition rear plate, the flow guide panel, the arc breaker, the flow guide bent plate, the transition rear plate and the transition side wall are enclosed together to form a first cavity communicated with the transition cavity, and urea injection holes communicated with the first cavity are arranged at the top of the transition side wall.
The bottom end of the arc-shaped crusher is contacted with the bottom end of the flow guide bent plate through the plate gap, and the way of communication between the first cavity and the transition cavity comprises the arc-shaped crusher and the plate gap.
A plate opening gap is arranged between the flow guide panel and the front plate inlet and is close to the urea injection hole, and the injection direction of the urea injection hole is opposite to the arc breaker; the flow guide panel comprises a plurality of panel strips which are parallel to each other, two ends of each panel strip are connected with the inlet of the front plate, a strip included angle is formed between the panel strip and the gravity line of the transition front plate, and the strip included angle is an acute angle.
The flow guiding bent plate comprises an upper connecting plate and a lower hanging plate, the top end of the upper connecting plate is connected with a position, close to the urea injection hole, on the transition side, of the upper connecting plate, the bottom end of the upper connecting plate is connected with the top end of the lower hanging plate, the bottom end of the lower hanging plate extends to the bottom end of the arc-shaped crusher, and the radian of the lower hanging plate is larger than that of the upper connecting plate; the front hole row and the rear hole row are correspondingly arranged at the positions, close to the transition front plate and the transition rear plate, of the flow guide bent plate, and each front hole row and each rear hole row comprises a plurality of bent plate through holes which are sequentially arranged.
The arc crusher comprises an arc frame and a plurality of vertical plate beams and transverse plate beams arranged in the arc frame, wherein the radian of each transverse plate beam is consistent with that of the arc frame, the adjacent transverse plate beams are parallel to each other, each transverse plate beam is intersected with all vertical plate beams, each vertical plate beam is intersected with all transverse plate beams, a single vertical plate beam is divided into a plurality of transverse sub-plates which are connected in sequence by all transverse plate beams, and broken pieces penetrate through the transverse sub-plates; along a single riser the beam direction is set to be the same, between adjacent broken pieces a vertical clearance is arranged; along the direction of the single transverse beam, a piece transverse gap is arranged between adjacent broken pieces.
The broken piece includes upper wing plate, well sleeve plate and lower pterygoid lamina, the top of upper wing plate extends to the direction on arc breaker top, and the bottom of upper wing plate is connected with the top of lower pterygoid lamina through well sleeve plate, and the bottom of lower pterygoid lamina extends to the direction of flow guiding bent plate bottom, and upper wing plate is located the top of arc frame, and lower pterygoid lamina is located the below of arc frame, and set up in the inside of well sleeve plate and insert complex cover and establish the diaphragm orifice.
The vertical rectifying unit comprises an arc-shaped upper pore plate and an arc-shaped lower pore plate which are arranged up and down, wherein the arc-shaped upper pore plate comprises an arc upper connecting end, an arc upper middle pore part and an arc upper hollow suspending end which are sequentially connected, a plurality of arc upper ventilation holes are formed in the arc upper middle pore part, and the arc-shaped lower pore plate comprises an arc lower connecting end, an arc lower middle pore part and an arc lower hollow suspending end which are sequentially connected, and a plurality of arc lower ventilation holes are formed in the arc lower middle pore part; the arc upper connecting end is connected with the transition side wall, the arc upper middle hole part and the arc upper empty hanging end are both positioned right below the ammonia gas generating unit, the arc lower connecting end is connected with the transition side wall, the arc lower middle hole part and the arc lower empty hanging end are both positioned right below the arc upper pore plate, and the arc upper connecting end is higher than the arc lower connecting end; in the horizontal direction, the arc-shaped lower pore plate is arranged opposite to the front plate outlet.
The horizontal rectifying unit comprises a rectifying inner pore plate and a rectifying outer pore plate which are coaxially arranged, the rectifying inner pore plate is clamped in the front plate outlet, the rectifying outer pore plate is clamped in the SCR output end, a part, which is clamped between the rectifying inner pore plate and the rectifying outer pore plate, of the SCR output end is a rectifying pore plate cavity, a plurality of rectifying inner holes are formed in the rectifying inner pore plate, and a plurality of rectifying outer holes are formed in the rectifying outer pore plate.
The rectification inner pore plate comprises an upper round part and a lower round part, a plurality of rectification inner pores are arranged on the upper round part, rectification large pores are arranged at the joint part of the lower round part, which is close to the lower round part, and a plurality of rectification inner pores are arranged on the lower round part around the edge of the rectification large pores; the rectification macropore comprises a hole straight line and a hole arc line, the junction of the top edge of the hole straight line, which is close to the lower round part and the upper round part, is provided with the bottom edge of the hole straight line connected with the hole arc line, and the hole arc line is positioned between the hole straight line and the bottom end of the lower round part.
The rectification outer orifice plate comprises an outer plate surface and a plurality of rectification outer orifices arranged on the outer plate surface, and the outer plate surface bulges towards the direction of the rectification inner orifice plate.
Compared with the prior art, the invention has the beneficial effects that:
1. in the packaging system between a DPF and an SCR in tail gas aftertreatment, a transition part is of a hollow structure, the top end and the bottom end of the transition part are respectively communicated with the input end of the DPF and the output end of the SCR, an ammonia generating unit is arranged at a position, close to an inlet of a front plate, in a transition cavity, a vertical rectifying unit is arranged in a position, below the ammonia generating unit, in the transition cavity, the SCR output end is internally provided with a horizontal rectifying unit, the ammonia generating unit comprises a flow guiding panel, an arc breaker and a flow guiding bent plate, and the flow guiding panel, the arc breaker, the flow guiding bent plate, the transition rear plate and a transition side wall jointly enclose a first cavity communicated with the transition cavity, and the design has the advantages that: firstly, the design does not additionally arrange an independent mixer, but utilizes the original packaging structure and the space between the DPF input end and the SCR output end to exert the effect of the mixer, thereby saving the cost and not increasing the assembly space; secondly, the DPF input end, the transition part and the SCR output end in the design form a horizontal U-shaped structure, so that the flow direction of tail gas sequentially passes through the DPF input end, the transition part and the SCR output end from top to bottom, and is consistent with the gravity direction, thereby being beneficial to the diffusion of gas, not obstructing the gas flow and being beneficial to improving the treatment efficiency; thirdly, the flow direction of the entering tail gas is changed through the flow guiding panel, and the changed tail gas is blocked through the transition rear plate, so that the tail gas can only spiral in the first cavity, the temperature in the first cavity can be increased, the risk of urea crystallization can be reduced, the force of collision to the arc-shaped crusher can be enhanced, the assistance is formed for urea liquid drops sprayed from the urea spraying holes, the crushing and evaporation of the urea liquid drops are promoted, and the effect of converting urea into ammonia gas is improved; finally, the vertical rectifying unit is used for carrying out airflow arrangement in the vertical direction on the generated ammonia, and the horizontal rectifying unit is used for carrying out airflow arrangement in the horizontal direction on the ammonia, so that the distribution uniformity of the ammonia and the uniformity of the airflow flowing speed are improved, and the subsequent reduction reaction is facilitated. Therefore, the invention not only needs no additional mixer, but also has better ammonia generating effect, and can improve the SCR reduction reaction effect by being provided with a rectification design.
2. In the packaging system between the DPF and the SCR in the tail gas post-treatment, a plate gap is reserved between the arc breaker and the flow guiding bent plate to be communicated with the first cavity and the transition cavity, the design is convenient for tail gas to pass through the plate gap and then spread around the first cavity so as to raise the temperature of the first cavity and reduce the risk of urea crystallization, and in addition, a plurality of bent plate through holes can be arranged on the flow guiding bent plate so as to facilitate the tail gas to pass through and heat the first cavity and the flow guiding bent plate, thereby further reducing the risk of urea crystallization. The invention thus makes it possible to reduce the risk of urea crystallization.
3. In the packaging system between the DPF and the SCR in the tail gas post-treatment, the plate opening gap is arranged between the flow guide panel and the front plate inlet and is close to the urea injection hole, and the design can enable part of tail gas to pass through straight lines so as to heat urea liquid drops just sprayed out of the urea injection hole, accelerate evaporation of the urea liquid drops, avoid urea crystallization, enlarge contact areas of urea and tail gas and improve ammonia gas generation effect. Therefore, the invention not only can reduce the risk of urea crystallization, but also has better ammonia gas generating effect.
4. The invention relates to a packaging system between DPF and SCR in tail gas post-treatment, wherein an arc breaker comprises an arc frame and a plurality of vertical plate beams, transverse plate beams and broken pieces which are arranged in the arc frame, wherein the vertical plate beams and the transverse plate beams form a grid structure in the arc frame, broken pieces are arranged on each transverse sub-plate in a penetrating way, and a piece vertical gap and a piece transverse gap are arranged between adjacent broken pieces, and the design has the advantages that: firstly, the arc breaker is of an arc structure on the whole, so that the detention time of urea liquid drops sprayed on the surface of the arc breaker can be prolonged, the breaking effect of the urea liquid drops can be improved, and the evaporation effect of urea and the ammonia gas generation efficiency can be improved; secondly, the densely distributed broken pieces can not only promote the breaking effect, but also emit broken urea liquid drops out through the vertical gaps and the horizontal gaps of the pieces so as to promote the evaporation effect; and the broken piece is of a similar Z-shaped structure, and the upper wing plate and the lower wing plate are respectively positioned above and below the arc-shaped frame. Therefore, the invention has better crushing effect on urea liquid drops, better evaporation effect and is beneficial to improving the generation effect of ammonia.
5. The invention relates to a packaging system between a DPF and an SCR in tail gas aftertreatment, which comprises an arc-shaped upper pore plate and an arc-shaped lower pore plate which are arranged up and down, wherein the arc-shaped upper pore plate comprises an arc upper connecting end, an arc upper middle pore part and an arc upper hollow suspending end which are sequentially connected, the arc-shaped lower pore plate comprises an arc lower connecting end, an arc lower middle pore part and an arc lower hollow suspending end which are sequentially connected, and the arc upper connecting end, the arc upper middle pore part, the arc upper hollow suspending end, the arc lower connecting end, the arc lower middle pore part and the arc lower hollow suspending end are sequentially arranged from top to bottom. Therefore, the invention is beneficial to not only generating ammonia, but also improving the uniformity of ammonia concentration and flow velocity, thereby improving the SCR reduction reaction effect.
6. The invention relates to a packaging system between a DPF and an SCR in tail gas aftertreatment, wherein a horizontal rectifying unit comprises a rectifying inner orifice plate and a rectifying outer orifice plate which are coaxially arranged, wherein the rectifying inner orifice plate is clamped in the interior of a front plate outlet, the rectifying outer orifice plate is clamped in the interior of an SCR output end, the part, clamped between the rectifying inner orifice plate and the rectifying outer orifice plate, of the SCR output end is a rectifying orifice plate cavity, and when the packaging system is applied, air flow passing through the vertical rectifying unit passes through the rectifying inner orifice plate first and then passes through the rectifying outer orifice plate to flow into the SCR output end, so that the concentration and the speed of the air flow are horizontally tidied, and the subsequent SCR reduction reaction can be smoothly carried out. Therefore, the invention can improve the uniformity of the concentration and the flow speed of the air flow, thereby improving the reduction reaction effect of the SCR.
7. In the packaging system between the DPF and the SCR in the tail gas aftertreatment, the rectification inner pore plate and the rectification outer pore plate are respectively provided with a plurality of holes, wherein the rectification inner pore plate is divided into an upper semicircle and a lower semicircle, the upper circle part is only provided with the rectification inner hole, the lower circle part is provided with the rectification inner hole and the rectification large hole, and the rectification large hole is larger than the rectification inner hole. In addition, the design that the direction of the outer plate facing the rectification inner orifice plate bulges enables the rectification outer orifice plate to face the flow direction of the exhaust gas so as to promote the uniform distribution of ammonia gas and the exhaust gas. Therefore, the invention can improve the uniformity of the concentration and the flow speed of the air flow, thereby improving the reduction reaction effect of the SCR.
8. In the packaging system between the DPF and the SCR in the tail gas aftertreatment, the arc-shaped lower pore plate is arranged opposite to the front plate outlet in the horizontal direction, the design is beneficial to the connection between the vertical rectifying unit and the horizontal rectifying unit, the rectifying effect of the vertical rectifying unit is not weakened, the normal operation of the horizontal rectifying unit is facilitated, and the concentration and the flow velocity uniformity of air flow are finally improved, so that the subsequent SCR reduction reaction is facilitated to be smoothly carried out. Therefore, the concentration and the flow velocity uniformity of the air flow treated by the method are higher.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a front view of fig. 1.
Fig. 3 is a left side view of fig. 1.
Fig. 4 is a schematic perspective view of the invention in rear view.
Fig. 5 is a schematic view of the appearance of the present invention.
FIG. 6 is a schematic view of the relative positions of the deflector panel, the arc breaker, and the deflector baffle of FIG. 1.
Fig. 7 is a schematic view of the deflector of fig. 1.
Fig. 8 is a schematic view of the arc breaker of fig. 1.
Fig. 9 is a front view of fig. 8.
Fig. 10 is a right side view of fig. 8.
Fig. 11 is a schematic view of the structure of the arc frame in fig. 8.
Fig. 12 is a schematic view of the construction of the broken piece in fig. 8.
Fig. 13 is a schematic view of the structure of the arc type upper orifice plate of fig. 1.
Fig. 14 is a schematic view of the structure of the arc type lower orifice plate of fig. 1.
Fig. 15 is a schematic view of the structure of the rectifying inner orifice plate of fig. 1.
Fig. 16 is a schematic view of the structure of the rectification outer orifice plate in fig. 1.
In the figure: DPF input end 1, transition part 2, transition shell 21, transition cavity 22, transition front plate 23, front plate inlet 231, front plate outlet 232, plate opening gap 233, transition rear plate 24, transition side wall 25, flow guide panel 3, panel strip 31, slat angle 32, arc breaker 4, arc frame 41, upper wing angle 411, lower wing angle 412, riser beam 42, cross sub-plate 421, cross-plate beam 43, broken piece 44, upper wing plate 441, middle sleeve plate 442, lower wing plate 443, sleeve plate hole 444, plate vertical gap 45, plate horizontal gap 46, flow guide bend plate 5, upper connection plate 51, lower suspension plate 52, front hole row 53, rear hole row 54, bend plate through hole 55, spray holes 6, vertical rectifying unit 7 the arc-shaped upper orifice plate 71, the arc-shaped upper connecting end 711, the arc-shaped upper middle orifice part 712, the arc-shaped upper hollow hanging end 713, the arc-shaped upper ventilation holes 714, the arc-shaped lower orifice plate 72, the arc-shaped lower connecting end 721, the arc-shaped lower middle orifice part 722, the arc-shaped lower hollow hanging end 723, the arc-shaped lower ventilation holes 724, the horizontal rectifying unit 8, the rectifying inner orifice plate 81, the upper round part 811, the lower round part 812, the rectifying outer orifice plate 82, the outer plate 821, the rectifying orifice plate cavity 83, the rectifying inner hole 84, the rectifying outer orifice 85, the left orifice area 86, the right orifice area 87, the partition area 88, the rectifying large hole 9, the hole straight lines 91, kong Huxian 92, the outer arc line hole columns 93, the inner oblique line hole columns 94, the hole column included angles 95, the SCR output end 10, the cavity X, the plate gap X1 and the ammonia generating unit X2.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and detailed description.
Referring to fig. 1 to 16, a packaging system between a DPF and an SCR in exhaust gas aftertreatment comprises a DPF input end 1, an SCR output end 10 and a transition part 2, wherein one end of the transition part 2 is communicated with a DPF particle trapping device through the DPF input end 1, and the other end of the transition part 2 is communicated with an SCR catalyst device through the SCR output end 10;
the transition part 2 comprises a transition housing 21 and a transition cavity 22 arranged in the transition housing 21, the transition housing 21 comprises a transition front plate 23, a transition rear plate 24 and a ring-shaped transition side wall 25 clamped between the transition front plate 23 and the transition rear plate, a front plate inlet 231 communicated with the DPF input end 1 is formed in the top of the transition front plate 23, a front plate outlet 232 communicated with the SCR output end 10 is formed in the bottom of the transition front plate 23, and the DPF input end 1, the transition part 2 and the SCR output end 10 together form a horizontal U-shaped structure;
an ammonia gas generating unit X2 is arranged in the transition cavity 22 near the front plate inlet 231, a vertical rectifying unit 7 is arranged in the transition cavity 22 below the ammonia gas generating unit X2, and the vertical rectifying unit 7 is communicated with a horizontal rectifying unit 8 arranged in the SCR output end 10;
the ammonia gas generating unit X2 comprises a flow guide panel 3, an arc breaker 4 and a flow guide bent plate 5, wherein the flow guide panel 3 is clamped in a front plate inlet 231, the arc breaker 4 and the flow guide bent plate 5 are arranged at the position, close to the front plate inlet 231, in the transition cavity 22, the arc breaker 4 and the flow guide bent plate 5 are clamped between a transition front plate 23 and a transition rear plate 24, the flow guide panel 3, the arc breaker 4, the flow guide bent plate 5, the transition rear plate 24 and a transition side wall 25 jointly enclose a first cavity X communicated with the transition cavity 22, and urea injection holes 6 communicated with the first cavity X are arranged at the top of the transition side wall 25.
The bottom end of the arc crusher 4 is contacted with the bottom end of the flow guiding bent plate 5 through a plate gap X1, and the way of communicating the first cavity X with the transition cavity 22 comprises the arc crusher 4 and the plate gap X1.
A plate gap 233 is arranged between the flow guide panel 3 and the front plate inlet 231, the plate gap 233 is arranged near the urea injection hole 6, and the injection direction of the urea injection hole 6 is opposite to the arc breaker 4; the guide panel 3 comprises a plurality of panel strips 31 parallel to each other, two ends of the panel strips 31 are connected with the front plate inlet 231, a strip included angle 32 is formed between the panel strips 31 and the gravity line of the transition front plate 23, and the strip included angle 32 is an acute angle.
The flow guiding bent plate 5 comprises an upper connecting plate 51 and a lower hanging plate 52, the top end of the upper connecting plate 51 is connected with a part, close to the urea injection hole 6, on the transition side wall 25, the bottom end of the upper connecting plate 51 is connected with the top end of the lower hanging plate 52, the bottom end of the lower hanging plate 52 extends towards the bottom end of the arc-shaped crusher 4, and the radian of the lower hanging plate 52 is larger than that of the upper connecting plate 51; the front hole row 53 and the rear hole row 54 are correspondingly arranged on the diversion bending plate 5 near the transition front plate 23 and the transition rear plate 24, and the front hole row 53 and the rear hole row 54 respectively comprise a plurality of bending plate through holes 55 which are sequentially arranged.
The arc crusher 4 comprises an arc frame 41 and a plurality of vertical plate beams 42 and transverse plate beams 43 arranged in the arc frame, the radian of each transverse plate beam 43 is consistent with that of the arc frame 41, the adjacent transverse plate beams 43 are mutually parallel, the adjacent vertical plate beams 42 are mutually parallel, each transverse plate beam 43 is intersected with all vertical plate beams 42, each vertical plate beam 42 is intersected with all transverse plate beams 43, a single vertical plate beam 42 is divided into a plurality of transverse sub-plates 421 which are connected in sequence by all transverse plate beams 43, and broken pieces 44 are penetrated on the transverse sub-plates 421; a sheet vertical gap 45 is arranged between adjacent broken pieces 44 along the direction of the single vertical plate beam 42; a sheet transverse gap 46 is provided between adjacent broken pieces 44 in the direction of the single transverse plate beam 43.
The broken piece 44 comprises an upper wing plate 441, a middle sleeve plate 442 and a lower wing plate 443, wherein the top end of the upper wing plate 441 extends towards the top end of the arc-shaped breaker 4, the bottom end of the upper wing plate 441 is connected with the top end of the lower wing plate 443 through the middle sleeve plate 442, the bottom end of the lower wing plate 443 extends towards the bottom end of the flow guiding bent plate 5, the upper wing plate 441 is positioned above the arc-shaped frame 41, the lower wing plate 443 is positioned below the arc-shaped frame 41, and a sleeve plate hole 444 which is in insertion fit with the transverse sub-plate 421 is formed in the middle sleeve plate 442.
The vertical rectifying unit 7 comprises an arc-shaped upper orifice plate 71 and an arc-shaped lower orifice plate 72 which are arranged up and down, the arc-shaped upper orifice plate 71 comprises an arc upper connecting end 711, an arc upper middle orifice part 712 and an arc upper hollow suspending end 713 which are sequentially connected, a plurality of arc upper air holes 714 are formed in the arc upper middle orifice part 712, the arc-shaped lower orifice plate 72 comprises an arc lower connecting end 721, an arc lower middle orifice part 722 and an arc lower hollow suspending end 723 which are sequentially connected, and a plurality of arc lower air holes 724 are formed in the arc lower middle orifice part 722; the arc upper connecting end 711 is connected with the transition side wall 25, the arc upper middle hole part 712 and the arc upper hollow end 713 are both positioned right below the ammonia generating unit X2, the arc lower connecting end 721 is connected with the transition side wall 25, the arc lower middle hole part 722 and the arc lower hollow end 723 are both positioned right below the arc upper pore plate 71, and the arc upper connecting end 711 is higher than the arc lower connecting end 721; in the horizontal direction, the arc-shaped lower orifice plate 72 is disposed directly opposite the front plate outlet 232.
The horizontal rectifying unit 8 comprises a rectifying inner orifice plate 81 and a rectifying outer orifice plate 82 which are coaxially arranged, the rectifying inner orifice plate 81 is clamped in the front plate outlet 232, the rectifying outer orifice plate 82 is clamped in the SCR output end 10, a rectifying orifice plate cavity 83 is formed in a position, clamped between the rectifying inner orifice plate 81 and the rectifying outer orifice plate 82, of the SCR output end 10, a plurality of rectifying inner holes 84 are formed in the rectifying inner orifice plate 81, and a plurality of rectifying outer holes 85 are formed in the rectifying outer orifice plate 82.
The rectification inner hole plate 81 comprises an upper round part 811 and a lower round part 812, the upper round part 811 is provided with a plurality of rectification inner holes 84, the position, near the junction of the lower round part 812 and the upper round part 811, of the lower round part 812 is provided with a rectification large hole 9, and the lower round part 812 is provided with a plurality of rectification inner holes 84 around the edge of the rectification large hole 9; the rectifying macropores 9 comprise hole straight lines 91 and 5298, the top edge of the hole straight line 91 is arranged near the junction of the lower round part 812 and the upper round part 811, the bottom edge of hole line 91 is connected to hole curve 92, and Kong Huxian is located between hole line 91 and the bottom end of lower circular portion 812.
The rectification outer orifice plate 82 includes an outer plate surface 821 and a plurality of rectification outer orifices 85 provided thereon, and the outer plate surface 821 bulges toward the rectification inner orifice plate 81.
The principle of the invention is explained as follows:
the exhaust aftertreatment referred to in the present invention includes: inlet→doc→dpf→mixer→scr→outlet, wherein the mixer is part of the aftertreatment system and the DOC/DPF/SCR is the catalyst inside the aftertreatment system. In the prior art, a special and independent mixer is arranged, but the original packaging space between the DPF and the SCR is utilized to realize the function of the mixer, namely, the packaging structure between the DPF and the SCR is utilized, and the packaging structure refers to a metal plate material for wrapping the catalysts and the parts thereof in DOC, DPF, SCR.
The included angle of the slats in the present invention is an acute angle, preferably 30-60 degrees. In the invention, the front side and the rear side of the flow guiding bending plate are preferably connected with the transition front plate and the transition rear plate respectively, and a front hole row and a rear hole row are respectively arranged at the positions close to the two sides, and each front hole row and each rear hole row comprises a plurality of bending plate through holes which are sequentially arranged. In the invention, the arc breaker is preferably connected with the transition front plate and the transition rear plate through two side edges of the arc breaker, namely two side edges of the arc frame. In the invention, the sleeve plate hole which is in insertion fit with the transverse sub-plate is formed in the middle sleeve plate, and the width of the transverse sub-plate is preferably larger than that of the middle sleeve plate, so that the middle sleeve plate can slide relatively along the transverse sub-plate where the middle sleeve plate is positioned.
According to the invention, the distribution concentration of ammonia gas and the uniformity of the exhaust speed can be improved through the vertical rectifying unit and the horizontal rectifying unit, so that the conversion efficiency of the ammonia gas is improved, the SCR reduction effect is enhanced, and the integral compression of the transition part is reduced. When the device is specifically applied, the gas flowing direction of the ammonia gas generated in the ammonia gas generating unit is changed twice under the combined action of the arc-shaped upper pore plate, the arc-shaped lower pore plate and the transition shell, the flow length of the exhaust gas is increased, the heat exchange and evaporation between urea liquid drops and the exhaust gas are promoted, meanwhile, the mixing between the exhaust gas and NH3 is also promoted, and then, when the device is subjected to the horizontal rectifying unit, the special structural design of the rectifying inner pore plate and the rectifying outer pore plate can improve the exhaust speed and the uniformity of the ammonia gas distribution again, so that the gas flowing to the SCR catalyst device finally is ensured to have high flow speed, the concentration of the ammonia gas is high in uniformity, and the smooth proceeding of the reduction reaction is facilitated.
An ammonia gas generating unit and a vertical rectifying unit as a rectifying design the horizontal rectifying units supplement each other: the urea solution is crushed, atomized and evaporated completely in the ammonia gas generating unit, so that the generation of ammonia gas can be promoted, and only gaseous ammonia gas can better exert the rectifying effects of the vertical rectifying unit and the horizontal rectifying unit, thereby ensuring the final ammonia gas distribution concentration and the uniformity of airflow velocity and improving the reduction effect of SCR.
Example 1:
referring to fig. 1 to 16, a packaging system between a DPF and an SCR in exhaust gas aftertreatment comprises a DPF input end 1, an SCR output end 10 and a transition part 2, wherein one end of the transition part 2 is communicated with a DPF particle trapping device through the DPF input end 1, and the other end of the transition part 2 is communicated with an SCR catalyst device through the SCR output end 10; the transition part 2 comprises a transition housing 21 and a transition cavity 22 arranged in the transition housing 21, the transition housing 21 comprises a transition front plate 23, a transition rear plate 24 and a ring-shaped transition side wall 25 clamped between the transition front plate 23 and the transition rear plate, a front plate inlet 231 communicated with the DPF input end 1 is formed in the top of the transition front plate 23, a front plate outlet 232 communicated with the SCR output end 10 is formed in the bottom of the transition front plate 23, and the DPF input end 1, the transition part 2 and the SCR output end 10 together form a horizontal U-shaped structure; an ammonia gas generating unit X2 is arranged in the transition cavity 22 near the front plate inlet 231, a vertical rectifying unit 7 is arranged in the transition cavity 22 below the ammonia gas generating unit X2, and the vertical rectifying unit 7 is communicated with a horizontal rectifying unit 8 arranged in the SCR output end 10; the ammonia gas generating unit X2 comprises a flow guide panel 3, an arc breaker 4 and a flow guide bent plate 5, wherein the flow guide panel 3 is clamped in a front plate inlet 231, the arc breaker 4 and the flow guide bent plate 5 are arranged at the position, close to the front plate inlet 231, in the transition cavity 22, the arc breaker 4 and the flow guide bent plate 5 are clamped between a transition front plate 23 and a transition rear plate 24, the flow guide panel 3, the arc breaker 4, the flow guide bent plate 5, the transition rear plate 24 and a transition side wall 25 jointly enclose a first cavity X communicated with the transition cavity 22, and urea injection holes 6 communicated with the first cavity X are arranged at the top of the transition side wall 25. Preferably, the bottom end of the arc breaker 4 contacts with the bottom end of the flow guiding bent plate 5 through the plate gap X1, and the way of communicating the first cavity X with the transition cavity 22 comprises the arc breaker 4 and the plate gap X1.
Example 2:
the basic content is the same as in example 1, except that:
a plate gap 233 is arranged between the flow guide panel 3 and the front plate inlet 231, the plate gap 233 is arranged near the urea injection hole 6, and the injection direction of the urea injection hole 6 is opposite to the arc breaker 4; the guide panel 3 comprises a plurality of panel strips 31 parallel to each other, two ends of the panel strips 31 are connected with the front plate inlet 231, a strip included angle 32 is formed between the panel strips 31 and the gravity line of the transition front plate 23, and the strip included angle 32 is an acute angle.
Example 3:
the basic content is the same as in example 1, except that:
the flow guiding bent plate 5 comprises an upper connecting plate 51 and a lower hanging plate 52, the top end of the upper connecting plate 51 is connected with a part, close to the urea injection hole 6, on the transition side wall 25, the bottom end of the upper connecting plate 51 is connected with the top end of the lower hanging plate 52, the bottom end of the lower hanging plate 52 extends towards the bottom end of the arc-shaped crusher 4, and the radian of the lower hanging plate 52 is larger than that of the upper connecting plate 51; the front hole row 53 and the rear hole row 54 are correspondingly arranged on the diversion bending plate 5 near the transition front plate 23 and the transition rear plate 24, and the front hole row 53 and the rear hole row 54 respectively comprise a plurality of bending plate through holes 55 which are sequentially arranged.
Example 4:
the basic content is the same as in example 1, except that:
the arc crusher 4 comprises an arc frame 41 and a plurality of vertical plate beams 42 and transverse plate beams 43 arranged in the arc frame, the radian of each transverse plate beam 43 is consistent with that of the arc frame 41, the adjacent transverse plate beams 43 are mutually parallel, the adjacent vertical plate beams 42 are mutually parallel, each transverse plate beam 43 is intersected with all vertical plate beams 42, each vertical plate beam 42 is intersected with all transverse plate beams 43, a single vertical plate beam 42 is divided into a plurality of transverse sub-plates 421 which are connected in sequence by all transverse plate beams 43, and broken pieces 44 are penetrated on the transverse sub-plates 421; a sheet vertical gap 45 is arranged between adjacent broken pieces 44 along the direction of the single vertical plate beam 42; a sheet transverse gap 46 is provided between adjacent broken pieces 44 in the direction of the single transverse plate beam 43.
Example 5:
the basic content is the same as in example 1, except that:
the vertical rectifying unit 7 comprises an arc-shaped upper orifice plate 71 and an arc-shaped lower orifice plate 72 which are arranged up and down, the arc-shaped upper orifice plate 71 comprises an arc upper connecting end 711, an arc upper middle orifice part 712 and an arc upper hollow suspending end 713 which are sequentially connected, a plurality of arc upper air holes 714 are formed in the arc upper middle orifice part 712, the arc-shaped lower orifice plate 72 comprises an arc lower connecting end 721, an arc lower middle orifice part 722 and an arc lower hollow suspending end 723 which are sequentially connected, and a plurality of arc lower air holes 724 are formed in the arc lower middle orifice part 722; the arc upper connecting end 711 is connected with the transition side wall 25, the arc upper middle hole part 712 and the arc upper hollow end 713 are both positioned right below the ammonia generating unit X2, the arc lower connecting end 721 is connected with the transition side wall 25, the arc lower middle hole part 722 and the arc lower hollow end 723 are both positioned right below the arc upper pore plate 71, and the arc upper connecting end 711 is higher than the arc lower connecting end 721; in the horizontal direction, the arc-shaped lower orifice plate 72 is disposed directly opposite the front plate outlet 232.
Example 6:
the basic content is the same as in example 1, except that:
the horizontal rectifying unit 8 comprises a rectifying inner orifice plate 81 and a rectifying outer orifice plate 82 which are coaxially arranged, the rectifying inner orifice plate 81 is clamped in the front plate outlet 232, the rectifying outer orifice plate 82 is clamped in the SCR output end 10, a rectifying orifice plate cavity 83 is formed in a position, clamped between the rectifying inner orifice plate 81 and the rectifying outer orifice plate 82, of the SCR output end 10, a plurality of rectifying inner holes 84 are formed in the rectifying inner orifice plate 81, and a plurality of rectifying outer holes 85 are formed in the rectifying outer orifice plate 82. The rectification inner hole plate 81 comprises an upper round part 811 and a lower round part 812, the upper round part 811 is provided with a plurality of rectification inner holes 84, the position, near the junction of the lower round part 812 and the upper round part 811, of the lower round part 812 is provided with a rectification large hole 9, and the lower round part 812 is provided with a plurality of rectification inner holes 84 around the edge of the rectification large hole 9; the rectifying macropore 9 comprises a hole straight line 91 and a hole straight line Kong Huxian 92, the top edge of the hole straight line 91 is arranged near the junction of the lower round part 812 and the upper round part 811, the bottom edge of the hole straight line 91 is connected with the hole arc line 92, and the hole straight line Kong Huxian is positioned between the hole straight line 91 and the bottom end of the lower round part 812. The rectification outer orifice plate 82 includes an outer plate surface 821 and a plurality of rectification outer orifices 85 provided thereon, and the outer plate surface 821 bulges toward the rectification inner orifice plate 81.
The above description is merely of preferred embodiments of the present invention, and the scope of the present invention is not limited to the above embodiments, but all equivalent modifications or variations according to the present disclosure will be within the scope of the claims.

Claims (8)

1. The utility model provides a packing system between DPF, SCR in tail gas aftertreatment, includes DPF input (1), SCR output (10) and transition portion (2), the one end of transition portion (2) communicates with each other with DPF particle trapping device through DPF input (1), and the other end of transition portion (2) communicates with each other with SCR catalyst device through SCR output (10), its characterized in that:
the transition part (2) comprises a transition shell (21) and a transition cavity (22) arranged in the transition shell, the transition shell (21) comprises a transition front plate (23), a transition rear plate (24) and a ring-shaped transition side wall (25) clamped between the transition front plate and the transition rear plate, a front plate inlet (231) communicated with the DPF input end (1) is formed in the top of the transition front plate (23), a front plate outlet (232) communicated with the SCR output end (10) is formed in the bottom of the transition front plate (23), and the DPF input end (1), the transition part (2) and the SCR output end (10) together form a horizontal U-shaped structure; an ammonia gas generating unit (X2) is arranged in the transition cavity (22) near the front plate inlet (231), a vertical rectifying unit (7) is arranged in the transition cavity (22) below the ammonia gas generating unit (X2), and the vertical rectifying unit (7) is communicated with a horizontal rectifying unit (8) arranged in the SCR output end (10);
the ammonia gas generating unit (X2) comprises a flow guide panel (3), an arc breaker (4) and a flow guide bent plate (5), wherein the flow guide panel (3) is clamped in a front plate inlet (231), the arc breaker (4) and the flow guide bent plate (5) are arranged at the position, close to the front plate inlet (231), in the transition cavity (22), of the transition cavity, the arc breaker (4) and the flow guide bent plate (5) are clamped between the transition front plate (23) and the transition rear plate (24), the flow guide panel (3), the arc breaker (4), the flow guide bent plate (5), the transition rear plate (24) and the transition side wall (25) jointly enclose a first cavity (X) communicated with the transition cavity (22), and urea injection holes (6) communicated with the first cavity (X) are formed in the top of the transition side wall (25);
the vertical rectifying unit (7) comprises an arc-shaped upper pore plate (71) and an arc-shaped lower pore plate (72) which are arranged up and down, the arc-shaped upper pore plate (71) comprises an arc upper connecting end (711), an arc upper middle pore part (712) and an arc upper hollow suspending end (713) which are sequentially connected, a plurality of arc upper ventilation holes (714) are formed in the arc upper middle pore part (712), the arc-shaped lower pore plate (72) comprises an arc lower connecting end (721), an arc lower middle pore part (722) and an arc lower hollow suspending end (723) which are sequentially connected, and a plurality of arc lower ventilation holes (724) are formed in the arc lower middle pore part (722); the arc upper connecting end (711) is connected with the transition side wall (25), the arc upper middle hole part (712) and the arc upper empty hanging end (713) are both positioned right below the ammonia gas generating unit (X2), the arc lower connecting end (721) is connected with the transition side wall (25), the arc lower middle hole part (722) and the arc lower empty hanging end (723) are both positioned right below the arc upper pore plate (71), and the arc upper connecting end (711) is higher than the arc lower connecting end (721); in the horizontal direction, the arc-shaped lower orifice plate (72) is arranged opposite to the front plate outlet (232);
the horizontal rectification unit (8) comprises a rectification inner orifice plate (81) and a rectification outer orifice plate (82) which are coaxially arranged, the rectification inner orifice plate (81) is clamped in the front plate outlet (232), the rectification outer orifice plate (82) is clamped in the SCR output end (10), a rectification orifice plate cavity (83) is formed in the position, between the rectification inner orifice plate (81) and the rectification outer orifice plate (82), a plurality of rectification inner holes (84) are formed in the rectification inner orifice plate (81), and a plurality of rectification outer holes (85) are formed in the rectification outer orifice plate (82).
2. The packaging system for an exhaust aftertreatment of a DPF, SCR between them according to claim 1, wherein: the bottom end of the arc crusher (4) is contacted with the bottom end of the flow guide bent plate (5) through the plate gap (X1), and the way of communication between the first cavity (X) and the transition cavity (22) comprises the arc crusher (4) and the plate gap (X1).
3. A packaging system for an exhaust aftertreatment between a DPF and an SCR according to claim 1 or 2, characterized in that: a plate opening gap (233) is arranged between the flow guide panel (3) and the front plate inlet (231), the plate opening gap (233) is arranged near the urea injection hole (6), and the injection direction of the urea injection hole (6) is opposite to the arc breaker (4); the flow guide panel (3) comprises a plurality of panel strips (31) which are parallel to each other, two ends of each panel strip (31) are connected with a front plate inlet (231), a strip plate included angle (32) is clamped between the panel strips (31) and the gravity line of the transition front plate (23), and the strip plate included angle (32) is an acute angle.
4. A packaging system for an exhaust aftertreatment between a DPF and an SCR according to claim 1 or 2, characterized in that: the flow guiding bent plate (5) comprises an upper connecting plate (51) and a lower hanging plate (52), the top end of the upper connecting plate (51) is connected with a part, close to the urea injection hole (6), on the transition side wall (25), the bottom end of the upper connecting plate (51) is connected with the top end of the lower hanging plate (52), the bottom end of the lower hanging plate (52) extends towards the bottom end of the arc-shaped crusher (4), and the radian of the lower hanging plate (52) is larger than that of the upper connecting plate (51); the front hole row (53) and the rear hole row (54) are correspondingly arranged at the positions, close to the transition front plate (23) and the transition rear plate (24), of the flow guide bent plate (5), and the front hole row (53) and the rear hole row (54) comprise a plurality of bent plate through holes (55) which are sequentially arranged.
5. A packaging system for an exhaust aftertreatment between a DPF and an SCR according to claim 1 or 2, characterized in that: the arc crusher (4) comprises an arc frame (41) and a plurality of vertical plate beams (42) and transverse plate beams (43) arranged in the arc frame, wherein the radian of each transverse plate beam (43) is consistent with that of the arc frame (41), the adjacent transverse plate beams (43) are parallel to each other, the adjacent vertical plate beams (42) are parallel to each other, each transverse plate beam (43) is intersected with all vertical plate beams (42), each vertical plate beam (42) is intersected with all transverse plate beams (43), a single vertical plate beam (42) is divided into a plurality of transverse sub-plates (421) which are sequentially connected by all transverse plate beams (43), and broken pieces (44) are arranged on the transverse sub-plates (421) in a penetrating manner; a sheet vertical gap (45) is arranged between adjacent broken pieces (44) along the direction of the single vertical plate beam (42); a sheet transverse gap (46) is arranged between adjacent broken pieces (44) along the direction of a single transverse plate beam (43).
6. The exhaust aftertreatment system of claim 5, wherein the exhaust aftertreatment system is disposed between the DPF and the SCR, wherein: the broken piece (44) comprises an upper wing plate (441), a middle sleeve plate (442) and a lower wing plate (443), wherein the top end of the upper wing plate (441) extends towards the top end of the arc-shaped breaker (4), the bottom end of the upper wing plate (441) is connected with the top end of the lower wing plate (443) through the middle sleeve plate (442), the bottom end of the lower wing plate (443) extends towards the bottom end of the flow guiding bent plate (5), the upper wing plate (441) is located above the arc-shaped frame (41), the lower wing plate (443) is located below the arc-shaped frame (41), and a sleeve plate hole (444) which is in insertion fit with the transverse plate (421) is formed in the middle sleeve plate (442).
7. A packaging system for an exhaust aftertreatment between a DPF and an SCR according to claim 1 or 2, characterized in that: the rectification inner pore plate (81) comprises an upper round part (811) and a lower round part (812), a plurality of rectification inner pores (84) are formed in the upper round part (811), rectification large pores (9) are formed in the position, close to the junction of the lower round part (812) and the upper round part (811), of the lower round part (812), and a plurality of rectification inner pores (84) are formed in the lower round part (812) around the edge of the rectification large pores (9); the rectification macropore (9) comprises a hole straight line (91) and Kong Huxian (92), the top edge of the hole straight line (91) is close to the junction of the lower round part (812) and the upper round part (811), the bottom edge of the hole straight line (91) is connected with Kong Huxian (92), and Kong Huxian (92) is located between the bottom ends of the hole straight line (91) and the lower round part (812).
8. The exhaust aftertreatment system of claim 7, wherein the exhaust aftertreatment system is disposed between the DPF and the SCR, wherein: the rectification outer orifice plate (82) comprises an outer plate surface (821) and a plurality of rectification outer orifices (85) arranged on the outer plate surface, and the outer plate surface (821) bulges towards the direction of the rectification inner orifice plate (81).
CN201811607194.6A 2018-12-27 2018-12-27 Packaging system between DPF and SCR in tail gas aftertreatment Active CN109441603B (en)

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CN111156072B (en) * 2019-12-19 2021-03-19 河北亿利科技股份有限公司 Tail gas aftertreatment mixing arrangement
CN114151174B (en) * 2021-11-22 2022-10-28 保定市屹马汽车配件制造有限公司 SCR mixer of automobile exhaust system

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