CN108798839A - Airborne exhaust treatment system and the machine for using diesel engine - Google Patents
Airborne exhaust treatment system and the machine for using diesel engine Download PDFInfo
- Publication number
- CN108798839A CN108798839A CN201710300064.7A CN201710300064A CN108798839A CN 108798839 A CN108798839 A CN 108798839A CN 201710300064 A CN201710300064 A CN 201710300064A CN 108798839 A CN108798839 A CN 108798839A
- Authority
- CN
- China
- Prior art keywords
- tail gas
- mixer
- discharging pipe
- gas discharging
- treatment system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007599 discharging Methods 0.000 claims abstract description 62
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000007864 aqueous solution Substances 0.000 claims abstract description 12
- 239000004202 carbamide Substances 0.000 claims abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 239000002178 crystalline material Substances 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 68
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 18
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 229910021529 ammonia Inorganic materials 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention provides a kind of airborne exhaust treatment system, mixer including being arranged in tail gas discharging pipe, the injection apparatus for aqueous solution of urea to be ejected on the mixer and the catalyst converter for being arranged in the tail gas discharging pipe and being located at the mixer downstream, it is characterized in that, the mixer is arranged in a manner of keeping gap between the tube wall of the tail gas discharging pipe in the tail gas discharging pipe.The present invention also provides a kind of machines using diesel engine being provided with the airborne exhaust treatment system.According to the present invention it is possible to avoid forming crystalline material on the mixer region of the near-wall of tail gas discharging pipe, to prevent or delay the obstruction of tail gas discharging pipe.
Description
Technical field
The present invention relates to the exhaust emissions for the machine for using diesel engine more particularly to a kind of airborne vent gas treatment systems
System.
Background technology
Diesel engine is since with good reliability, the thermal efficiency is high and the characteristics such as output torque is big and is widely used in
The machines such as small-sized, heavy or oversize vehicle, ship, generator and military tanks.Have in the tail gas of diesel engine emissions
The nitrogen oxides of high level needs just be discharged into after handling tail gas by dedicated airborne exhaust treatment system
In air.A kind of effective technology handled the tail gas of diesel engine emissions is to use selective catalytic reduction (SCR)
Method reduces the content of the nitrogen oxide in tail gas of diesel engine emissions.Selective catalytic reduction (SCR) method pass through by
Aqueous solution of urea is ejected on the mixer being arranged in tail gas discharging pipe, the blade collision on aqueous solution of urea and mixer and
It is cracked into little particulate and is pyrolyzed generation ammonia.Under the action of catalyst in catalyst converter, ammonia is as reducing agent by diesel oil
Harmful conversion of nitrogen oxides is harmless nitrogen and vapor in the tail gas of engine emission.Thus, airborne vent gas treatment system
System generally includes to be arranged the mixer in tail gas discharging pipe, the dress of the injection for being ejected into aqueous solution of urea on mixer
Set and be arranged in tail gas discharging pipe and be located at the catalyst converter in mixer downstream.
In existing airborne exhaust treatment system, mixer is close to the tube wall setting of tail gas discharging pipe.In diesel engine
When operation, radiated to ambient enviroment at heat absorption when ammonia and by the tube wall of tail gas discharging pipe due to aqueous solution of urea pyrolysis,
The temperature in the near-wall region of tail gas discharging pipe can be reduced relative to the temperature of the central area of tail gas discharging pipe, be injected into
Aqueous solution of urea in the near-wall region of tail gas discharging pipe cannot be fully pyrolyzed into ammonia, to be easy to arrange in tail gas
It puts and forms crystalline material on the mixer region of the near-wall of pipe.Compared with diesel engine is run with high load capacity operating mode, bavin
The case where exhaust temperature discharged when oil turbine is run with running on the lower load is lower, formation crystalline material is more serious.Work as knot
Eutectic substance to a certain extent when, the crystalline material on mixer will block delivery pipe, cause diesel engine back pressure to increase, fuel
Consumption increases, and exhaust emissions more deteriorates, and then airborne exhaust emissions diagnostic system is caused to be alarmed, so that control system is certainly
The output torque of dynamic limitation diesel engine.
It is then desired to be improved to the existing airborne exhaust treatment system for the machine using diesel engine.
Invention content
One object of the present invention seeks to propose a kind of improved airborne exhaust treatment system, this airborne vent gas treatment
System can avoid forming crystalline material on the tube wall of the tail gas discharging pipe around mixer.
For this purpose, according to an aspect of the present invention, a kind of airborne exhaust treatment system is provided, including：
The mixer being arranged in tail gas discharging pipe；
Injection apparatus for being ejected into aqueous solution of urea on the mixer；And
It is arranged in the tail gas discharging pipe and positioned at the catalyst converter in the mixer downstream；
It is characterized in that, the mixer is arranged in a manner of keeping gap between the tube wall of the tail gas discharging pipe
In the tail gas discharging pipe.
Preferably, the mixer is supported on by support device on the tube wall of the tail gas discharging pipe, so as in institute
It states and forms the gap between mixer and the tube wall of the tail gas discharging pipe.
Preferably, the support device includes being arranged circumferentially evenly-spacedly in the periphery of the mixer and institute
State at least two supporting blocks between the tube wall of tail gas discharging pipe.
Preferably, the support device includes being arranged circumferentially evenly-spacedly in the periphery of the mixer and institute
State four supporting blocks between the tube wall of tail gas discharging pipe.
Preferably, the gap between the mixer and the tube wall of the tail gas discharging pipe be sized to 1 to
20mm。
According to another aspect of the present invention, a kind of machine using diesel engine is provided, which is characterized in that the machine
It is provided with airborne exhaust treatment system as described above.
Airborne exhaust treatment system according to the present invention, due to being deposited between the periphery of mixer and the tube wall of tail gas discharging pipe
In gap, on the one hand, mixer is not in direct contact with the tube wall of tail gas discharging pipe so that heat is easily detected by tail gas discharging pipe
Tube wall be dispersed into ambient enviroment, on the other hand, high-temperature tail gas flowing in part caused by diesel combustion by gap, to
The tube wall and mixer of tail gas discharging pipe are heated.In this way, the temperature of the tube wall of tail gas discharging pipe around mixer
And the temperature in mixer close to the region of the tube wall of tail gas discharging pipe will not all significantly decrease, and be injected into close to tail gas and arrange
Ammonia can be fully pyrolyzed by putting the aqueous solution of urea on the region of the mixer of the near-wall of pipe, thus can be to avoid
Crystalline material is formed since temperature is too low on the mixer region of the near-wall of tail gas discharging pipe, and then prevents or delays
The obstruction of tail gas discharging pipe.
Description of the drawings
Fig. 1 schematically shows a part for airborne exhaust treatment system according to the present invention；And
Fig. 2 is the cross-sectional view along Fig. 1 center lines 2-2.
Specific implementation mode
With reference to each preferred embodiment of example detailed description of the present invention.It will be understood by those skilled in the art that this
A little embodiments are exemplary, it is not meant to form any restrictions to the present invention.
Fig. 1 schematically shows that a part for airborne exhaust treatment system according to the present invention, Fig. 2 are along in Fig. 1
The cross-sectional view of line 2-2.As illustrated in fig. 1 and 2, airborne exhaust treatment system 1 according to the present invention includes being arranged in tail gas
Mixer 5 in delivery pipe 3, be arranged on tail gas discharging pipe 3 at 5 upstream of mixer the left side of mixer (that is, in Fig. 1) and
Injection apparatus (not shown) for being ejected into aqueous solution of urea on mixer 5 and be arranged in tail gas discharging pipe 3 and
Catalyst converter (not shown) positioned at 5 downstream of mixer.It is close to the tube wall setting of tail gas discharging pipe 3 with mixer 5 in the prior art
Difference, in airborne exhaust treatment system 1 according to the present invention, the outer diameter of mixer 5 is less than the internal diameter of tail gas discharging pipe 3, makes
Mixer 5 is obtained in a manner of keeping certain interval 7 between the tube wall of tail gas discharging pipe 3 to be arranged in tail gas discharging pipe 3.Gap
7 size cannot select too big, otherwise can lead to tail gas and ammonia undercompounding；The size in gap 7 can not select
It is too small, it otherwise can so that the tail gas amount flowed through by gap is very little, insulation effect reduces and excessive back pressure.Mixer 5
The size in the gap 7 between periphery and the tube wall of tail gas discharging pipe 3 is preferably chosen as about 1 to 20mm.
Mixer 5 is supported on using support device 9 on the tube wall of tail gas discharging pipe 3.It is preferably implemented shown in Fig. 1 and 2
In example, support device 9 is shown as being arranged circumferentially evenly-spacedly in the periphery of mixer 5 and tail gas discharging pipe 3
Four supporting blocks 11 between tube wall.It will be appreciated that the quantity of supporting block 11 can be more than four or less than four, but
At least two.Each supporting block 11 can be respectively soldered on mixer 5 and tail gas discharging pipe 3, can also pass through selection
Right dimensions and shapes and by wedge between mixer 5 and tail gas discharging pipe 3.Support device 9 may be arranged as other shapes
Shape, such as the annulus with multiple holes or waveform ring-shaped article.As long as mixer 5 can be supported on exhaust emissions by support device 9
On the tube wall of pipe 3 and allow between the periphery of mixer 5 and the tube wall of tail gas discharging pipe 3 there are certain gap 7, support dress
It sets 9 and any suitable shape may be used.Preferably, sectional area of the support device 9 in the circumferential direction of tail gas discharging pipe 3,
And it is as small as possible with the contact area of mixer 5 and tail gas discharging pipe 3, it is passed by support device 9 with reducing heat as far as possible
It is delivered to tail gas discharging pipe 3 and is dispersed into ambient enviroment.
In airborne exhaust treatment system according to the present invention is installed, when diesel engine is run produced by diesel combustion
Tail gas (as shown in arrow A in Fig. 1) pass through airborne exhaust treatment system 1, with the leaf for being ejected into mixer 5 by injection apparatus
The ammonia of the aqueous solution of urea pyrolysis of on piece is sufficiently mixed, catalyst converter of the mixed gas flow direction positioned at 5 downstream of mixer.It is urging
Under the action of changing the catalyst in device, ammonia turns harmful nitrogen oxides in the tail gas of diesel engine emissions as reducing agent
Turn to harmless nitrogen and vapor.Since there are gap 7, a sides between the periphery and the tube wall of tail gas discharging pipe 3 of mixer 5
Face, tube wall of the mixer 5 not with tail gas discharging pipe 3 are in direct contact so that the tube wall that heat is easily detected by tail gas discharging pipe 3 dissipates
It is dealt into ambient enviroment, on the other hand, high-temperature tail gas flowing in part is by gap 7 caused by diesel combustion, to tail gas
The tube wall and mixer 5 of delivery pipe 3 are heated.In this way, the temperature of the tube wall of tail gas discharging pipe 3 around mixer 5 with
And the temperature in mixer 5 close to the region of the tube wall of tail gas discharging pipe 3 will not all significantly decrease, and be injected into close to tail gas and arrange
Ammonia can be fully pyrolyzed by putting the aqueous solution of urea on the region of the mixer 5 of the near-wall of pipe, thus can be kept away
Exempt to form crystalline material since temperature is too low on the mixer region of the near-wall of tail gas discharging pipe, and then prevents or prolong
The obstruction of slow tail gas discharging pipe.
Above in association with specific embodiment to the present invention have been described in detail.Obviously, above description and show in the accompanying drawings
The embodiment gone out should be construed as illustratively, but not to limit the present invention.For those skilled in the art
Speech, can carry out various variations or modifications, these variations or modifications are not to it without departing from the spirit of the invention
It departs from the scope of the present invention.
Claims (6)
1. a kind of airborne exhaust treatment system (1), including：
The mixer (5) being arranged in tail gas discharging pipe (3)；
Injection apparatus for being ejected into aqueous solution of urea on the mixer (5)；And
It is arranged in the tail gas discharging pipe (3) and positioned at the catalyst converter in the mixer (5) downstream；
It is characterized in that, the mixer (5) between the tube wall of the tail gas discharging pipe (3) in a manner of keeping gap (7)
It is arranged in the tail gas discharging pipe (3).
2. airborne exhaust treatment system (1) according to claim 1, which is characterized in that the mixer (5) passes through support
Device (9) is supported on the tube wall of the tail gas discharging pipe (3), so as in the mixer (5) and the tail gas discharging pipe
(3) gap (7) is formed between tube wall.
3. airborne exhaust treatment system (1) according to claim 2, which is characterized in that the support device (9) includes edge
Circumferential be arranged evenly-spacedly between the periphery of the mixer (5) and the tube wall of the tail gas discharging pipe (3) extremely
Few two supporting blocks (11).
4. airborne exhaust treatment system (1) according to claim 3, which is characterized in that the support device (9) includes edge
Circumferential four be arranged evenly-spacedly between the periphery of the mixer (5) and the tube wall of the tail gas discharging pipe (3)
A supporting block (11).
5. airborne exhaust treatment system (1) according to claim 1, which is characterized in that the mixer (5) and the tail
The gap (7) between the tube wall of gas delivery pipe (3) is sized to 1 to 20mm.
6. a kind of machine using diesel engine, which is characterized in that the machine setting is any just like claim 1-5 described
Airborne exhaust treatment system (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710300064.7A CN108798839A (en) | 2017-05-02 | 2017-05-02 | Airborne exhaust treatment system and the machine for using diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710300064.7A CN108798839A (en) | 2017-05-02 | 2017-05-02 | Airborne exhaust treatment system and the machine for using diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108798839A true CN108798839A (en) | 2018-11-13 |
Family
ID=64054147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710300064.7A Pending CN108798839A (en) | 2017-05-02 | 2017-05-02 | Airborne exhaust treatment system and the machine for using diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108798839A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105143628A (en) * | 2013-02-14 | 2015-12-09 | 大陆汽车有限责任公司 | Exhaust gas line section for supplying liquid additive |
| CN105275554A (en) * | 2015-10-21 | 2016-01-27 | 西安交通大学 | SCR post-treatment device with exhaust mixer |
| US20160332126A1 (en) * | 2015-05-11 | 2016-11-17 | Cummins Emission Solutions, Inc. | Mixing assembly for reducing exhaust reductant deposits |
-
2017
- 2017-05-02 CN CN201710300064.7A patent/CN108798839A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105143628A (en) * | 2013-02-14 | 2015-12-09 | 大陆汽车有限责任公司 | Exhaust gas line section for supplying liquid additive |
| US20160332126A1 (en) * | 2015-05-11 | 2016-11-17 | Cummins Emission Solutions, Inc. | Mixing assembly for reducing exhaust reductant deposits |
| CN105275554A (en) * | 2015-10-21 | 2016-01-27 | 西安交通大学 | SCR post-treatment device with exhaust mixer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181113 |
|
| WD01 | Invention patent application deemed withdrawn after publication |