CN111271166A - Compact box-type post-processor and urea mixer thereof - Google Patents

Compact box-type post-processor and urea mixer thereof Download PDF

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Publication number
CN111271166A
CN111271166A CN202010232977.1A CN202010232977A CN111271166A CN 111271166 A CN111271166 A CN 111271166A CN 202010232977 A CN202010232977 A CN 202010232977A CN 111271166 A CN111271166 A CN 111271166A
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CN
China
Prior art keywords
cylinder
scr
doc
port
mounting hole
Prior art date
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Pending
Application number
CN202010232977.1A
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Chinese (zh)
Inventor
陈增响
何伟娇
马相雪
何龙
张旭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuxi Weifu Lida Catalytic Converter Co Ltd
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Wuxi Weifu Lida Catalytic Converter Co Ltd
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Application filed by Wuxi Weifu Lida Catalytic Converter Co Ltd filed Critical Wuxi Weifu Lida Catalytic Converter Co Ltd
Priority to CN202010232977.1A priority Critical patent/CN111271166A/en
Publication of CN111271166A publication Critical patent/CN111271166A/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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—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

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

Abstract

The invention relates to a compact box-type postprocessor and a urea mixer thereof, which comprise a front clapboard and a rear clapboard, wherein a DOC-DPF cylinder, a mixer, a first SCR cylinder and a second SCR cylinder are arranged between the front clapboard and the rear clapboard, an air inlet end cover is arranged at the front port of the DOC-DPF cylinder, a waste gas inlet is arranged on the air inlet end cover, the front port of the mixer, the front port of the first SCR cylinder and the front port of the second SCR cylinder are communicated, the rear port of the first SCR cylinder is communicated with the rear port of the second SCR cylinder, the rear port of the mixer is communicated with the rear port of the DOC-DPF cylinder, a tail gas through hole is arranged on the rear clapboard, a box body cover plate is arranged between the front clapboard and the rear clapboard for wrapping, and an outlet pipe is arranged on the box. The invention has simple structure, can meet the requirements of airflow uniformity and NH3 uniformity, improves the conversion efficiency of DOC, DPF and SCR, and can obviously reduce the risk of urea crystallization.

Description

Compact box-type post-processor and urea mixer thereof
Technical Field
The invention belongs to the technical field of diesel engine tail gas aftertreatment, and relates to a compact box type aftertreatment device and a urea mixer thereof.
Background
In the diesel engine tail gas aftertreatment industry, continuously improving the uniformity of airflow on the inlet surfaces of DOC, DPF and SCR is an important measure and means for ensuring the conversion efficiency of an aftertreatment device. Meanwhile, aiming at the SCR system, how to improve the uniformity of the concentration of NH3 on the end face of the SCR catalyst is the key in the whole development process to reduce the crystallization risk of urea at the position of the mixer. The commonly used box-type postprocessor is easy to satisfy the air flow uniformity and the NH3 uniformity due to large occupied space, but with the development of the integration trend of the postprocessor, the compact box-type postprocessor is difficult to realize due to the fact that the mixed space is further compressed.
Especially for the SCR system with two parallel channels, the air inflow of the two SCR channels is reasonable, the air flow uniformity and the NH3 uniformity are ensured, and the satisfactory effect is difficult to achieve by adopting the conventional orifice plate design.
Disclosure of Invention
The invention aims to provide a compact box type postprocessor and a urea mixer thereof, which can meet the requirements of airflow uniformity and NH3 uniformity, improve the conversion efficiency of DOC, DPF and SCR, and remarkably reduce the risk of urea crystallization.
According to the technical scheme provided by the invention: the utility model provides a box aftertreatment ware of compact and urea blender thereof, includes preceding baffle and back baffle, preceding baffle with set up DOCC barrel, blender, first SCR barrel, second SCR barrel between the baffle, port installation inlet end cover before the DOCC barrel, it has the waste gas import to open on the inlet end cover, port before the blender port before the first SCR barrel port before the second SCR barrel port intercommunication, first SCR barrel rear port with second SCR barrel rear port intercommunication, the blender rear port with port intercommunication behind the DOCC barrel, the back baffle is opened there is the tail gas through-hole, preceding baffle with wrap up through setting up the box apron between the baffle of back, install the outlet pipe on the box apron.
As a further improvement of the invention, the front clapboard is provided with a DOCC cylinder front mounting hole, a mixer front mounting hole, a first SCR cylinder front mounting hole and a second SCR cylinder front mounting hole, and the rear clapboard is provided with a DOCC cylinder rear mounting hole, a mixer rear mounting hole, a first SCR cylinder rear mounting hole and a second SCR cylinder rear mounting hole.
As a further improvement of the present invention, the front end and the rear end of the DOCDPF cylinder are respectively located in the DOCDPF cylinder front mounting hole and the DOCDPF cylinder rear mounting hole, the front end and the rear end of the mixer are respectively located in the mixer front mounting hole and the mixer rear mounting hole, the front end and the rear end of the first SCR cylinder are respectively located in the first SCR cylinder front mounting hole and the first SCR cylinder rear mounting hole, and the front end and the rear end of the second SCR cylinder are respectively located in the second SCR cylinder front mounting hole and the second SCR cylinder rear mounting hole.
As a further improvement of the invention, the intake end cover is eccentrically provided with a waste gas inlet, the inner periphery of the front end of the DOCC cylinder is provided with a DOC front mixing plate, the DOC front mixing plate is provided with a tail gas through hole, one side of the DOC front mixing plate is provided with a DOC front mixing notch, and the DOCC cylinder is internally provided with a waste gas purifying catalyst.
As a further improvement of the invention, the mixer comprises an outer end cover of a mixing cavity, a nozzle connecting boss is arranged in the outer end cover of the mixing cavity, the nozzle connecting boss is provided with a urea nozzle, the front side of the outer end cover of the mixing cavity is connected with an inner end cover of the mixing cavity, the inner end cover of the mixing cavity is provided with a DOCC barrel connecting ring, one side of the DOCC barrel connecting ring is provided with a connecting pipe locating sleeve, a connecting pipe is arranged in the connecting pipe locating sleeve, a swirl hole pipe is arranged in the connecting pipe, a porous convex blocking cover is arranged at the front end port of the swirl hole pipe, a diversion horn-shaped pipe is arranged at the rear end port of the swirl hole pipe, the periphery of the front part of the swirl hole pipe is provided with a swirl hole, the periphery of the rear part of the swirl hole pipe is provided with a fin-shaped orifice, a blocking ring is arranged at the periphery between the swirl hole pipe and the fin, the DOCCDPF cylinder body connecting ring sleeve is arranged on the periphery of the rear port of the DOCCDPF cylinder body.
As a further improvement of the invention, the mixer front port, the first SCR cylinder front port, and the second SCR cylinder front port are communicated by providing an SCR front end cover, the first SCR cylinder rear port and the second SCR cylinder rear port are communicated by an SCR rear end cover, the SCR rear end cover is installed on the rear side of the rear partition plate, and the rear partition plate is provided with the exhaust gas through hole at a portion covered by the SCR rear end cover.
As a further improvement of the invention, the box cover plate consists of an upper box cover plate and a lower box cover plate, and the outlet pipe is arranged on the lower box cover plate.
As a further improvement of the invention, a hoop is arranged on the periphery of the connecting pipe positioning sleeve.
As a further improvement of the invention, the baffle ring is fixed in the connecting pipe by a welding process.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts the design of double SCR channels with different sizes, thereby greatly reducing the size of the box type postprocessor and leading the size of the box type postprocessor to be more compact.
2. Aiming at the air inlet directions of the DOC, the DPF and the SCR, the invention respectively adopts the half-moon-shaped and the arc-shaped mixing plates to mix the air flow, thereby improving the air flow uniformity of eccentric air inlet and double SCR channels and the NH3 uniformity of the double SCR channels.
3. The invention adopts the long rotational flow hole pipe to form strong rotational airflow, and the long hole pipe is more favorable for the rapid crushing and diffusion of urea, thereby preventing the urea from being excessively rapidly accumulated in a narrow space.
4. The tail end of the swirl hole pipe adopts the porous convex blocking cover, so that urea is prevented from accumulating in the swirl hole pipe, and the secondary crushing effect is formed on the urea in the swirl hole pipe.
5. The cyclone orifice pipe is designed by adopting two layers of porous partition plates, and secondary crushing effect is formed on urea particles outside the cyclone orifice pipe.
6. The front end of the rotational flow hole pipe adopts the flow guide flared pipe, so that air flow and urea can be guided to enter the rotational flow hole pipe from the middle position, and the urea at the position of the nozzle is prevented from being transversely impacted by the air flow to cause crystallization at the position of the nozzle.
Drawings
FIG. 1 is an isometric view of a compact box-type aftertreatment device of the present invention.
Fig. 2 is a left side view of the compact box post processor of the present invention.
FIG. 3 is a right side view of the compact box post processor of the present invention.
FIG. 4 is an exploded view of the compact case post processor of the present invention.
FIG. 5 is an exploded view of the end cap of the compact case aftertreatment device of the present invention.
FIG. 6 is an overall exploded view of the compact box post processor of the present invention.
FIG. 7 is an exploded view of the mixer of the compact box post-processor of the present invention.
FIG. 8 is an exploded view of the swirl tube of the compact box aftertreatment device of the present invention.
FIG. 9 is an isometric view of a front bulkhead of the invention.
FIG. 10 is an isometric view of a rear bulkhead of the invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In the figures 1-10, the device comprises an air inlet end cover 1, a front clapboard 2, a DOC-DPF cylinder front mounting hole 2-1, a mixer front mounting hole 2-2, a first SCR cylinder front mounting hole 2-3, a second SCR cylinder front mounting hole 2-4, a DOC front mixing plate 3, a DOC-DPF cylinder 4, a rear clapboard 5, a DOC-DPF cylinder rear mounting hole 5-1, a mixer rear mounting hole 5-2, a first SCR cylinder rear mounting hole 5-3, a second SCR cylinder rear mounting hole 5-4, a connecting hoop 6, a mixer 7, a urea nozzle 7-1, a mixing cavity outer end cover 7-2, a mixing cavity inner end cover 7-3, a DPF-DPF cylinder connecting ring 7-31, a connecting pipe positioning sleeve 7-32, a connecting pipe clamp 7-4, a rotational flow horn pipe 7-5, a rotational flow hole pipe 7-6, a rotational flow guide horn pipe 7-6, The device comprises a baffle ring 7-7, a porous mixing ring 7-8, a porous convex blocking cover 7-9, a connecting pipe 7-10, an SCR front end cover 8, an SCR front mixing plate 9, a first SCR cylinder 10, a second SCR cylinder 11, an SCR rear end cover 12, an outlet pipe 13, an upper tank cover plate 14 and a lower tank cover plate 15 and the like.
As shown in figures 1-5, the invention relates to a compact box type aftertreatment device and a urea mixer thereof, which comprises a front clapboard 2 and a rear clapboard 5, wherein as shown in figure 9, the front clapboard 2 is provided with a DOC-DPF cylinder front mounting hole 2-1, a mixer front mounting hole 2-2, a first SCR cylinder front mounting hole 2-3 and a second SCR cylinder front mounting hole 2-4. As shown in FIG. 10, a DOC-DPF cylinder rear mounting hole 5-1, a mixer rear mounting hole 5-2, a first SCR cylinder rear mounting hole 5-3, a second SCR cylinder rear mounting hole 5-4, and a tail gas through hole 5-5 are formed in the rear partition plate 5. In this specification, the front partition 2 side is defined as a front direction, and the rear partition 5 side is defined as a rear direction.
DOC-DPF cylinder 4, mixer 7, first SCR cylinder 10 and second SCR cylinder 11 are arranged between front partition board 2 and rear partition board 5. The front end and the rear end of the DOC-DPF cylinder 4 are respectively positioned in a front mounting hole 2-1 of the DOC-DPF cylinder and a rear mounting hole 5-1 of the DOC-DPF cylinder, the front end and the rear end of the mixer 7 are respectively positioned in a front mounting hole 2-2 of the mixer and a rear mounting hole 5-2 of the mixer, the front end and the rear end of the first SCR cylinder 10 are respectively positioned in a front mounting hole 2-3 of the first SCR cylinder and a rear mounting hole 5-3 of the first SCR cylinder, and the front end and the rear end of the second SCR cylinder 11 are respectively positioned in a front mounting hole 2-4 of the second SCR cylinder and a rear mounting hole 5-4 of the second SCR cylinder.
The front end of a DOC-DPF cylinder front mounting hole 2-1 is connected with an air inlet end cover 1, a waste gas inlet is eccentrically arranged on the air inlet end cover 1, a DOC front mixing plate 3 is arranged on the inner periphery of the front end of the DOC-DPF cylinder 4, and a waste gas purification catalyst is arranged in the DOC-DPF cylinder 4. A tail gas through hole is formed in the DOC front mixing plate 3, and a DOC front mixing notch is formed in one side of the DOC front mixing plate 3.
As shown in fig. 6 to 8, the mixer 7 includes a mixing chamber outer end cap 7-2, a nozzle connecting boss is opened in the mixing chamber outer end cap 7-2, and the urea nozzle 7-1 is installed on the nozzle connecting boss. The front side of the outer end cover 7-2 of the mixing cavity is connected with the inner end cover 7-3 of the mixing cavity, the inner end cover 7-3 of the mixing cavity is provided with a DOC-DPF cylinder connecting ring 7-31, and one side of the DOC-DPF cylinder connecting ring is provided with a connecting pipe positioning sleeve 7-32. The connecting pipe 7-10 is arranged in the connecting pipe positioning sleeve 7-32, and the connecting pipe positioning sleeve 7-32 is fixed by arranging a clamp 7-4 at the periphery of the connecting pipe positioning sleeve. A swirl hole pipe 7-6 is arranged in a connecting pipe 7-10, a porous convex blocking cover 7-9 is arranged at the front end opening of the swirl hole pipe 7-6, a flow guide horn pipe 7-5 is arranged at the rear end opening of the swirl hole pipe 7-6, swirl holes are arranged at the periphery of the front part of the swirl hole pipe 7-6, a fin-shaped orifice is arranged at the periphery of the rear part of the swirl hole pipe 7-6, a baffle ring 7-7 is arranged at the periphery between the swirl holes and the fin-shaped orifice, and a porous mixing ring 7-8 is arranged at the periphery of the front part of the swirl hole pipe 7-6. The baffle ring 7-7 is fixed in the connecting pipe 7-10 through a welding process. The flow guide flared tube 7-5 is positioned on the side surface of the nozzle connecting boss. The DOC-DPF cylinder body connecting rings 7-31 are sleeved on the periphery of the rear end port of the DOC-DPF cylinder body 4.
The middle part of the multi-hole convex blocking cover 7-9 is provided with waste gas through holes, and urea breaking holes are uniformly distributed on the periphery of the waste gas through holes.
Urea breaking holes are uniformly distributed on the periphery of the porous mixing ring 7-8.
The front port of the mixer 7, the front port of the first SCR cylinder 10 and the front port of the second SCR cylinder 11 are communicated through an SCR front end cover 8, and the rear port of the first SCR cylinder 10 is communicated with the rear port of the second SCR cylinder 11 through an SCR rear end cover 12. The SCR rear end cap 12 is mounted on the rear side of the rear bulkhead 5. And the rear clapboard 5 is provided with tail gas through holes 5-5 at the part covered by the SCR rear end cover 12.
Wrap up through setting up the box apron between preceding baffle 2 and the back baffle 5. The box cover plate consists of an upper box cover plate 14 and a lower box cover plate 15, and the outlet pipe 13 is arranged on the lower box cover plate 15.
The working process of the invention is as follows:
when the waste gas enters the compact box type postprocessor, the waste gas firstly enters the DOC-DPF cylinder 4 through a waste gas inlet on the air inlet end cover 1 and is mixed with the air flow before the mixing is finished through the DOC front mixing plate 3. Due to the limitation of the air inlet direction, the invention is typical of eccentric air inlet, namely, the air inlet is not positioned on the central axis of the DPC-DPF cylinder body 4. The DOC front mixing plate 3 adopts a half-moon-shaped pore plate and is provided with a tail gas through hole, and the tail gas generates certain pressure when passing through the tail gas through hole, so that part of the tail gas flows in from the DOC front mixing gap, and the problem of uneven air flow caused by eccentric air inlet can be effectively solved.
The waste gas flows out from the tail end after the evolution of the waste gas purifying catalyst in the DOC-DPF cylinder 4, enters a DOC-DPF cylinder connecting ring 7-31, is firstly converged in a mixing cavity formed by an outer end cover 7-2 of the mixing cavity and an inner end cover 7-3 of the mixing cavity, then flows into the rear part of the connecting pipe 7-10 along a gap between a nozzle connecting boss and the connecting pipe 7-10, enters the rear part of the swirl hole pipe 7-6 through a fin-shaped orifice due to the blocking of the blocking ring 7-7, and forms strong rotating airflow through the fin-shaped orifice. At the moment, the urea is sprayed into the urea nozzle 7-1, enters the rotational flow hole pipe 7-6 through the flow guide flared pipe 7-5, is rapidly rotated and diffused under the action of strong rotational airflow of waste gas, a small part of urea is diffused out through the porous convex blocking cover 7-9 at the bottom of the rotational flow hole pipe 7-6, a large part of urea is thrown out through the rotational flow hole on the rotational flow hole pipe 7-6, and the thrown urea is secondarily crushed and mixed through the blocking ring 7-7 and the porous mixing ring 7-8. The purpose of using swirl and longer swirl hole tubes and two layers of porous mixing plates is to force the urea to diffuse out from multiple locations, preventing the urea from hitting the wall and accumulating at the same location.
After the exhaust gas and the decomposed NH3 are mixed in the mixer 7, the exhaust gas and the decomposed NH3 enter the SCR front end cover 8, and are divided into two flows, which are respectively counted in the first SCR cylinder 10 and the second SCR cylinder 11. Because the exhaust gas and the decomposed NH3 flow through the first SCR cylinder firstly, in order to prevent the excessive discharge of the gas flow from the first SCR cylinder 10 and improve the uniformity of the concentration distribution of NH3 in the first SCR cylinder 10, the semi-conical SCR front mixing plate 9 at the front end of the first SCR cylinder 10 is used for shunting and mixing, and the SCR front mixing plate 9 prevents a part of exhaust gas and the decomposed NH3 from flowing into the first SCR cylinder, so that the gas flow entering the second SCR cylinder 11 is ensured, and the uniformity of the gas flow and the uniformity of the concentration of NH3 are improved.
The completely converted exhaust gas discharged from the rear ports of the first SCR cylinder 10 and the second SCR cylinder 11 enters the SCR rear end cover 12, enters a chamber formed by the cover plate of the box body, the front partition plate 2 and the rear partition plate 5 through tail gas through holes 5-5 formed in the rear partition plate 5, and is finally discharged out of the post-processor from an outlet pipe 13.

Claims (9)

1. The utility model provides a box aftertreatment ware of compact and urea blender which characterized in that: the mixer comprises a front clapboard (2) and a rear clapboard (5), a DOC-DPF cylinder (4), a mixer (7), a first SCR cylinder (10) and a second SCR cylinder (11) are arranged between the front clapboard (2) and the rear clapboard (5), an air inlet end cover (1) is installed at the front port of the DOC-DPF cylinder (4), a waste gas inlet is formed in the air inlet end cover (1), the front port of the mixer (7), the front port of the first SCR cylinder (10) and the front port of the second SCR cylinder (11) are communicated, the rear port of the first SCR cylinder (10) is communicated with the rear port of the second SCR cylinder (11), the rear port of the mixer (7) is communicated with the rear port of the DOC-DPF cylinder (4), a tail gas through hole (5-5) is formed in the rear clapboard (5), and the front clapboard (2) and the rear clapboard (5) are wrapped by a box cover plate, an outlet pipe (13) is arranged on the cover plate of the box body.
2. The compact box-type aftertreatment and urea mixer according to claim 1, wherein: the front clapboard (2) is provided with a DOC-DPF cylinder front mounting hole (2-1), a mixer front mounting hole (2-2), a first SCR cylinder front mounting hole (2-3) and a second SCR cylinder front mounting hole (2-4), and the rear clapboard (5) is provided with a DOC-DPF cylinder rear mounting hole (5-1), a mixer rear mounting hole (5-2), a first SCR cylinder rear mounting hole (5-3) and a second SCR cylinder rear mounting hole (5-4).
3. The compact box-type aftertreatment and urea mixer according to claim 2, characterized in that: the front end and the rear end of the DOC-DPF cylinder (4) are respectively positioned in the DOC-DPF cylinder front mounting hole (2-1) and the DOC-DPF cylinder rear mounting hole (5-1), the front end and the rear end of the mixer (7) are respectively positioned in the mixer front mounting hole (2-2) and the mixer rear mounting hole (5-2), the front end and the rear end of the first SCR cylinder (10) are respectively positioned in the first SCR cylinder front mounting hole (2-3) and the first SCR cylinder rear mounting hole (5-3), and the front end and the rear end of the second SCR cylinder (11) are respectively positioned in the second SCR cylinder front mounting hole (2-4) and the second SCR cylinder rear mounting hole (5-4).
4. The compact box-type aftertreatment and urea mixer according to claim 2, characterized in that: the exhaust purification device is characterized in that a waste gas inlet is formed in the air inlet end cover (1) in an eccentric mode, a DOC front mixing plate (3) is installed in the front end of the DOC-DPF cylinder body (4) in the inner circumference, a tail gas through hole is formed in the DOC front mixing plate (3), a DOC front mixing notch is formed in one side of the DOC front mixing plate (3), and a waste gas purification catalyst is installed in the DOC-DPF cylinder body (4).
5. The compact box-type aftertreatment and urea mixer according to claim 1, wherein: the mixer (7) comprises an outer end cover (7-2) of a mixing cavity, a nozzle connecting boss is arranged in the outer end cover (7-2) of the mixing cavity, a urea nozzle (7-1) is installed on the nozzle connecting boss, the front side of the outer end cover (7-2) of the mixing cavity is connected with an inner end cover (7-3) of the mixing cavity, a DOC-DPF cylinder connecting ring (7-31) is arranged on the inner end cover (7-3) of the mixing cavity, a connecting pipe positioning sleeve (7-32) is arranged on one side of the DOC-DPF cylinder connecting ring, a connecting pipe (7-10) is installed in the connecting pipe positioning sleeve (7-32), a swirl hole pipe (7-6) is arranged in the connecting pipe (7-10), and a porous convex blocking cover (7-9) is installed at the front port of the swirl hole, swirl orifice pipe (7-6) back port installation water conservancy diversion flared tube (7-5), swirl orifice pipe (7-6) front portion periphery is opened there is the whirl orifice, swirl orifice pipe (7-6) rear portion periphery is opened has the fin form drill way, the whirl orifice with the periphery installation between the fin form drill way keeps off ring (7-7), porous mixing ring (7-8) are installed to swirl orifice pipe (7-6) front portion periphery, water conservancy diversion flared tube (7-5) are located the boss side is connected to the nozzle, DOC-DPF barrel go-between (7-31) cover is located DOC-DPF barrel (4) back port periphery.
6. The compact box-type aftertreatment and urea mixer according to claim 1, wherein: the front port of the mixer (7), the front port of the first SCR cylinder (10) and the front port of the second SCR cylinder (10) are communicated through an SCR front end cover (8), the rear port of the first SCR cylinder (10) is communicated with the rear port of the second SCR cylinder (11) through an SCR rear end cover (12), the SCR rear end cover (12) is installed on the rear side of the rear partition plate (5), and the part of the rear partition plate (5) covered by the SCR rear end cover (12) is provided with the tail gas through hole (5-5).
7. The compact box-type aftertreatment and urea mixer according to claim 1, wherein: the box body cover plate consists of an upper box body cover plate (14) and a lower box body cover plate (15), and the outlet pipe (13) is installed on the lower box body cover plate (15).
8. The compact box-type aftertreatment and urea mixer according to claim 5, wherein: and a hoop (7-4) is arranged on the periphery of the connecting pipe positioning sleeve (7-32).
9. The compact box-type aftertreatment and urea mixer according to claim 5, wherein: the baffle ring (7-7) is fixed in the connecting pipe (7-10) through a welding process.
CN202010232977.1A 2020-03-28 2020-03-28 Compact box-type post-processor and urea mixer thereof Pending CN111271166A (en)

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CN202010232977.1A CN111271166A (en) 2020-03-28 2020-03-28 Compact box-type post-processor and urea mixer thereof

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112746886A (en) * 2021-01-19 2021-05-04 武汉洛特福动力技术有限公司 Automobile exhaust purification device with U-shaped structure and mixer
CN112814770A (en) * 2020-12-31 2021-05-18 潍柴动力股份有限公司 Uniformity evaluation method and device of parallel SCR system
CN113775395A (en) * 2021-10-18 2021-12-10 无锡威孚力达催化净化器有限责任公司 Font mixing arrangement and aftertreatment system return

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112814770A (en) * 2020-12-31 2021-05-18 潍柴动力股份有限公司 Uniformity evaluation method and device of parallel SCR system
CN112746886A (en) * 2021-01-19 2021-05-04 武汉洛特福动力技术有限公司 Automobile exhaust purification device with U-shaped structure and mixer
CN113775395A (en) * 2021-10-18 2021-12-10 无锡威孚力达催化净化器有限责任公司 Font mixing arrangement and aftertreatment system return

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