CN110206620A - A kind of self feed back controllable register formula SCR urea mixer - Google Patents
A kind of self feed back controllable register formula SCR urea mixer Download PDFInfo
- Publication number
- CN110206620A CN110206620A CN201910369776.3A CN201910369776A CN110206620A CN 110206620 A CN110206620 A CN 110206620A CN 201910369776 A CN201910369776 A CN 201910369776A CN 110206620 A CN110206620 A CN 110206620A
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- baffle
- type material
- heating device
- feed back
- type
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
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 self feed back controllable register formula SCR urea mixers, and including frame and the multiple baffles being fixed on frame, baffle is equipped with temperature difference electricity generation device and heating device.Injection of the baffle side by urea liquid, temperature is lower, is cold end；The baffle other side is washed away by uncooled tail gas, and temperature is higher, referred to as hot end, and temperature difference electricity generation device utilizes the thermo-electric generation.Heating device is placed on baffle, the electric energy that thermo-electric generation obtains connects heating device, heating device fever heating baffle.A kind of self feed back adjusts temperature difference electricity generation device to the present invention in this way, takes full advantage of mixer partition temperature difference between the two ends, and baffle can be prevented to be cooled down by urea liquid, is avoided as much as possible the crystallization of urea liquid, improves transformation efficiency.
Description
Technical field
The present invention relates to the utilization of residual heat of tail gas of automobile and exhaust aftertreatment technical field, specially a kind of self feed back is adjusted
Baffle-type SCR urea mixer.
Background technique
Energy in the automobile engine course of work there are about 30%-40%, into atmosphere, generates simultaneously with exhaust emissions
NOxEqual pernicious gases, cause energy waste and environmental pollution.In recent years, with increasingly strict, the tail gas of diesel engine emissions regulations
Post-processing technology is the technical measures that must be used.SCR technology (SCR) basic principle is sprayed by urea
System is sprayed into exhaust pipe after being atomized the aqueous solution of urea of 32.5% concentration and is mixed with motor exhaust, and aqueous solution of urea passes through
Pyrolysis and hydrolysis generate ammonia, and ammonia converts oxynitrides harmful in diesel engine vent gas under the effect of the catalyst
For harmless nitrogen and water, the top priority of motor exhaust processing technique route is to keep tail gas and the effective hybrid concurrency of ammonia mist raw
Chemical reaction, and urea be sprayed at into catalyst before guarantee sufficient temp.In vehicle-exhaust exhaust pipe road, due to SCR
The incomplete decomposing of urea in system causes to form urea crystals on mixer, and blocking mixer causes to arrange as time goes by
Back pressure increases inside feed channel, is unfavorable for the work of tail gas discharge and SCR system.
Summary of the invention
In response to the deficiencies in the existing technology, the present invention provides a kind of mixing of self feed back controllable register formula SCR urea to fill
It sets, the present invention in blender blade by arranging thermoelectric generation film, using being formed on urea spray injection to blender blade
The temperature difference, by tail gas tow taste heat recycle, and by heating device by heat return to temperature of the cold side of the power generation, thus
Urea is avoided to form crystallization on the mixer, and this patent has automatic feedback regulatory function, when urea is formed and is crystallized, temperature
Difference will be promoted, so that thermoelectric generation film generating efficiency is promoted, so that cold junction temperature, which is promoted, reduces crystallization formation.
The present invention achieves the above technical objects by the following technical means.
A kind of self feed back baffle-type SCR urea mixer, it is special including frame and the multiple baffles being fixed on frame
Sign is that the baffle is equipped with temperature difference electricity generation device and heating device；
The temperature difference electricity generation device include be arranged in baffle urea liquid spray less than side P-type material and n type material；
The P-type material and n type material are not contacted and are connected between the side of baffle by conducting wire；
The heating device is set to the side that baffle urea liquid is ejected into；
The one end of the P-type material and n type material far from baffle is electrically connected to form circuit with the both ends of heating device respectively；
The baffle and P-type material, n type material, heating device, the connection between frame are thermally conductive, non-conductive.
Further, multiple groups P-type material and n type material are provided on the baffle.
Further, it connects to be formed back with heating device again after being serially connected between the power generator between multi-piece baffle plate
Road.
Further, the P-type material of the temperature difference electricity generation device and n type material are connected with hot end far from the side of baffle and keep off
Plate.
Further, the heating device is resistance screen.
Further, it is insulated glue sticking between P-type material, n type material, heating device and baffle by high temperature resistant inorganic.
Further, the material of the baffle and hot end baffle is stainless steel.
Further, baffle and frame are bonded together with high temperature resistant inorganic insulating cement.
High-temperature tail gas flows through mixer, while urea liquid can be sprayed on baffle by spraying, and baffle temperature is caused to reduce, and not
The tail gas cooling by urea liquid will continue to along exhaust pipe backward, therefore baffle two sides form apparent temperature difference.It is located at gear
The temperature difference is converted electric energy by temperature difference electricity generation device on plate, does not need to store, and is directly connected to be covered on the resistance wire on baffle
Net converts electrical energy into thermal energy, heats to urea, prevents urea crystals.Knot is easy since urea is reduced to 300 DEG C or less
Crystalline substance, when baffle temperature difference is larger, the electric energy that temperature difference electricity generation device obtains at this time is also more, and then the obtained thermal energy of conversion is also
It is more, baffle can be heated, avoid the crystallization of urea, promote the hydrolysis of urea, improve the transformation efficiency of SCR system；And work as
Baffle temperature difference is smaller, and the electric energy that thermo-electric generation obtains also accordingly tails off, that is, forms the function of self feed back.
The invention has the benefit that
1) thermal resistance silk screen uniform close fits on baffle, and first convenient for making full use of exhaust pipe waste heat, next makes
It converts obtained thermal energy and maximizes heating urea solution.
2) it is used for a long time, if urea is crystallized, resistance screen for heating can be replaced, extend mixing
The service life of device.
3) structure is simple, reduces unnecessary loss, can maximally utilize the temperature difference of mixer baffle two sides.
4) without storing electric energy, energy transformation ratio is increased, maximization, which recovers energy, promotes the decomposition of urea, improves SCR
Transformation efficiency.
Detailed description of the invention
Fig. 1 is SCR system structural schematic diagram of the present invention.
Fig. 2 is the main view of SCR baffle-type mixer of the present invention.
Fig. 3 is SCR baffle-type mixer side view of the present invention.
Fig. 4 is each piece of small front apron detail of construction of the present invention.
Power generator connection schematic diagram of the Fig. 5 between baffle of the present invention.
Appended drawing reference:
1 engine；2 exhaust pipes；3 mixers；4 catalyst converters；5 urea injection pipes；6 urea boxes；7 urea pumps；3-1 p-type material
Material；3-2 n type material；3-3 heating device；3-4 baffle；The hot end 3-5 baffle；3-6 frame.
Specific embodiment
Present invention will be further explained with reference to the attached drawings and specific examples, and the examples of the embodiments are attached
It is shown in figure, in which the same or similar labels are throughly indicated same or similar element or there is same or like function
Element.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to be used to explain the present invention, and should not be understood as
Limitation of the present invention.
Fig. 1 show SCR system structure diagram, mixer 3 is equipped with inside the exhaust pipe 2 of engine 1, before mixer 3
End is provided with urea injection pipe 5, and the urea liquid being stored in urea box 6 is ejected into mixer 3 and is arranged by urea pump 7
Enter catalyst converter 4 together after motor exhaust mixing in tracheae 2 to be handled.
Fig. 2 is the structure chart of baffle-type mixer of the present invention, and the self feed back baffle-type SCR urea mixer includes
Frame and the multiple baffle 3-4 being fixed on frame 3-6, the baffle 3-4 are equipped with temperature difference electricity generation device and heating device 3-
3, the temperature difference electricity generation device include be arranged in baffle 3-4 urea liquid spray less than side P-type material 3-1 and n type material
3-2, p-type are rich cavitation materials, and N-type is electron rich material.The P-type material 3-1 and n type material 3-2 is not contacted and close to gear
It is connected between the side of plate 3-4 by conducting wire.The heating device 3-3 is set to the side that baffle 3-4 urea liquid is ejected into；Institute
Both ends of the one end of P-type material 3-1 and n type material 3-2 far from baffle 3-4 respectively with heating device 3-3 are stated to be electrically connected to form back
Road；Connection between the baffle 3-4 and P-type material 3-1, n type material 3-2, heating device 3-3 and mixer frame 3-6
It is thermally conductive, non-conductive.
Wherein frame 3-6 and baffle 3-4 are made into stainless steel, baffle 3-4 and frame 3-6 ZS-1071 high temperature resistant inorganic
Insulating cement is bonded together.Heating device 3-3 can be made into resistance screen, such as with 0.2mm nichrome wire Cr20Ni80
The resistance screen being made into.Heating device 3-3 is bonded by ZS-1071 high temperature resistant inorganic insulating cement with baffle 3-4.P-type material 3-1
It is adhered on baffle 3-4 with n type material 3-2 with ZS-1071 high temperature resistant inorganic insulating cement.
According to Bei Saike effect, P-type material 3-1 and n type material 3-2 are connected to form a knot, close to the one of baffle 3-4
Injection of the side due to receiving urea liquid, temperature is lower, is cold end, high temperature of the side far from baffle 3-4 in tail gas processed
It is higher to act on lower temperature, is hot end, P-type material 3-1 and the both ends n type material 3-2 formation temperature are poor, under the excitation of heat, P
Profile material temperature end hole concentration is higher than low-temperature end, and n type material temperature end electron concentration is higher than low-temperature end, therefore in this concentration
Under the driving of gradient, hole and electronics begin to spread to low-temperature end, to form electromotive force.P-type material 3-1, N-type in Fig. 4
Material 3-2 constitutes a temperature difference electricity generation device, converts heat into electric energy.Temperature difference electricity generation device passes through conducting wire and heating device
3-3 electrical connection, converts electrical energy into thermal energy.
In addition, in terms of circuit connection, as shown in figure 5, after being serially connected between power generator between multi-piece baffle plate 3-4
It connects and is formed into a loop with heating device 3-3 again.Two groups of P-type material 3-1 on two neighboring baffle and between n type material 3-2 it is remote
Side from baffle 3-4 is connected with conducting wire, and in order to not influence the mixed effect of urea liquid, the cabling of conducting wire is bonded frame as far as possible
Frame 3-6 does not influence tail gas and passes through, and is equivalent to and constitutes big thermo-electric generation, a heating device.
In order to protect P-type material 3-1 and n type material 3-2 P-type material 3-1 and n type material 3-2 far from baffle 3-4 one
Side ZS-1071 high temperature resistant inorganic insulation glue sticking hot end baffle 3-5.
When system is run, high-temperature tail gas flows through mixer, while urea liquid can be sprayed on baffle by spraying, causes baffle 3-
4 temperature reduce, and are not affected by the cooling tail gas of urea liquid and will continue to along exhaust pipe backward, therefore the hot end side baffle 3-5 meeting
It keeps in high-temperature flue gas, the side of such two block baffles contact tail gas just forms an apparent temperature difference.And from experiment
From the point of view of, this temperature is the more considerable energy of a part between 100 DEG C to 200 DEG C.
The temperature difference is converted electric energy by the temperature difference electricity generation device, does not need to store, and is directly connected to be covered on baffle 3-4
Resistance screen converts electrical energy into thermal energy, heats to urea, is easy crystallization since urea is reduced to 300 DEG C or less, works as gear
When plate temperature difference is larger, the electric energy that temperature difference electricity generation device obtains at this time is also more, and then the thermal energy that conversion obtains is also just more, can be right
Baffle 3-4 is heated, and the crystallization of urea is avoided, and promotes the hydrolysis of urea, improves the transformation efficiency of SCR system；And work as baffle
Temperature difference is smaller, i.e. the side baffle 3-4 temperature is relatively high, will not influence the electric energy that thermo-electric generation obtains is few
The transformation efficiency of SCR system.
The embodiment is a preferred embodiment of the present invention, but present invention is not limited to the embodiments described above, not
In the case where substantive content of the invention, any conspicuous improvement that those skilled in the art can make, replacement
Or modification all belongs to the scope of protection of the present invention.
Claims (8)
1. a kind of self feed back baffle-type SCR urea mixer, including frame and the multiple baffles being fixed on frame (3-6)
(3-4), which is characterized in that the baffle (3-4) is equipped with temperature difference electricity generation device and heating device (3-3)；
The temperature difference electricity generation device include setting baffle (3-4) urea liquid spray less than side P-type material (3-1) and N
Profile material (3-2)；The P-type material (3-1) and n type material (3-2) do not contact and lead between the side of baffle (3-4)
Cross conducting wire connection；
The heating device (3-3) is set to the side that baffle (3-4) urea liquid is ejected into；
The one end of the P-type material (3-1) and n type material (3-2) far from baffle (3-4) respectively with heating device (3-3) two
End is electrically connected to form circuit；
The baffle (3-4) and P-type material (3-1), n type material (3-2), heating device (3-3), the company between frame (3-6)
It connects thermally conductive, non-conductive.
2. self feed back baffle-type SCR urea mixer as described in claim 1, which is characterized in that be arranged on the baffle (3-4)
There are multiple groups P-type material (3-1) and n type material (3-2).
3. self feed back baffle-type SCR urea mixer as described in claim 1, which is characterized in that between multi-piece baffle plate (3-4)
It connects and is formed into a loop with heating device (3-3) again after being serially connected between power generator.
4. self feed back baffle-type SCR urea mixer as described in claim 1, which is characterized in that the P of the temperature difference electricity generation device
The side of profile material (3-1) and n type material (3-2) separate baffle (3-4) is connected with hot end baffle (3-5).
5. self feed back baffle-type SCR urea mixer as described in claim 1, which is characterized in that the heating device (3-3) is
Resistance screen.
6. self feed back baffle-type SCR urea mixer as described in claim 1, which is characterized in that P-type material (3-1), N-type material
It is insulated glue sticking between material (3-2), heating device (3-3) and baffle (3-4) by high temperature resistant inorganic.
7. self feed back baffle-type SCR urea mixer as claimed in claim 3, which is characterized in that the baffle (3-4) and hot end
The material of baffle (3-5) is stainless steel.
8. self feed back baffle-type SCR urea mixer as described in claim 1, which is characterized in that baffle (3-4) and frame (3-
6) it is bonded together with high temperature resistant inorganic insulating cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910369776.3A CN110206620B (en) | 2019-05-06 | 2019-05-06 | Self-feedback adjusting baffle type SCR urea mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910369776.3A CN110206620B (en) | 2019-05-06 | 2019-05-06 | Self-feedback adjusting baffle type SCR urea mixer |
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| CN110206620A true CN110206620A (en) | 2019-09-06 |
| CN110206620B CN110206620B (en) | 2021-01-15 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FR3120095A1 (en) * | 2021-02-25 | 2022-08-26 | Faurecia Systemes D'echappement | Heating unit, manufacturing process, exhaust gas purification system, exhaust line and vehicle |
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