CN113153497A - Self-adaptation adds fever type urea decomposition device - Google Patents
Self-adaptation adds fever type urea decomposition device Download PDFInfo
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- CN113153497A CN113153497A CN202110421625.5A CN202110421625A CN113153497A CN 113153497 A CN113153497 A CN 113153497A CN 202110421625 A CN202110421625 A CN 202110421625A CN 113153497 A CN113153497 A CN 113153497A
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- heating
- resistance wire
- wire net
- heating resistance
- net column
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000004202 carbamide Substances 0.000 title claims abstract description 48
- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 17
- 206010037660 Pyrexia Diseases 0.000 title description 2
- 238000010438 heat treatment Methods 0.000 claims abstract description 104
- 238000009413 insulation Methods 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 abstract description 7
- 238000002425 crystallisation Methods 0.000 abstract description 7
- 230000008025 crystallization Effects 0.000 abstract description 5
- 230000007062 hydrolysis Effects 0.000 abstract description 5
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 5
- 239000007921 spray Substances 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000003044 adaptive effect Effects 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
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
- F01N3/18—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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- 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
- Y02T10/40—Engine management systems
Landscapes
- 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 the technical field of urea mixers, in particular to a self-adaptive heating type urea decomposition device, which comprises a heating resistance wire net column, a temperature sensor, a heating electrode and an electronic control unit, wherein the heating resistance wire net column is arranged on the heating resistance wire net column; the temperature sensor and the heating electrode are arranged inside the heating resistance wire net column and are connected with the electronic control unit; and a closed loop structure is formed among the temperature sensor, the heating resistance wire net column, the electronic control unit and the heating electrode. The device detects the temperature change of the heating resistance wire net column in real time through the temperature sensor and feeds the temperature change back to the electronic control unit, and after the electronic control unit judges whether the heating is performed or not, the heating power is controlled, and the heating operation is performed or stopped on the heating resistance wire net column through the heating electrode, so that the temperature of urea spray beams is increased, the hydrolysis of a urea solution is promoted, the crystallization risk is enhanced, the use cost is reduced, and the utilization efficiency is improved.
Description
Technical Field
The invention relates to the technical field of urea mixers, in particular to a self-adaptive heating type urea decomposition device.
Background
At present, the urea mixer utilizes a wire mesh structure to break urea solution so as to improve ammonia mixing uniformity and anti-crystallization risk, but an EGR valve is cancelled in many factories, after a high-efficiency SCR route is taken, the rise of an original row directly causes the urea injection quantity to be greatly increased, the large urea injection quantity causes the wire mesh structure temperature to suddenly drop, a state with a lower temperature is kept for a long time, and meanwhile, the factory considers the gas-holding degree of a TVA valve for reducing oil consumption so as to cause the exhaust temperature to drop.
In summary, the crystallization risk of the prior art is very high, and the problem is difficult to solve through structural improvement.
Accordingly, the present invention provides an adaptive heating type urea decomposition device to solve the above-mentioned technical problems.
Disclosure of Invention
The invention aims to provide a self-adaptive heating type urea decomposition device, which can promote the hydrolysis of urea solution in a heating mode under the low-temperature state of SCR (selective catalytic reduction) so as to enhance the capability of resisting the risk of urea crystallization.
In order to achieve the purpose of the invention, the invention provides a self-adaptive heating type urea decomposition device, which comprises a heating resistance wire net column, a temperature sensor, a heating electrode and an electronic control unit, wherein the heating resistance wire net column is connected with the heating resistance wire net column;
the temperature sensor and the heating electrode are arranged inside the heating resistance wire net column and are connected with the electronic control unit;
and a closed loop structure is formed among the temperature sensor, the heating resistance wire net column, the electronic control unit and the heating electrode.
Further, the heating resistance wire net column is arranged right below the urea nozzle.
Further, the center of the heating resistance wire mesh column is aligned with the center of the urea nozzle.
Furthermore, the heating resistance wire net column is of a cylindrical structure consisting of a plurality of net-shaped resistance wires.
Further, the temperature sensor is arranged in the center of the heating resistance wire net column.
Further, the electronic control unit adjusts the heating strategy and the calibration according to the ambient temperature and the input of the required injection amount of urea.
Further, the electronic control improves responsiveness by providing preheating.
And further, a ceramic heat insulation ring is arranged at the periphery of the heating resistance wire net column.
Compared with the prior art, the self-adaptive heating type urea decomposition device has the following advantages that:
(1) the design of the heating resistance wire mesh column can effectively crush the urea solution into more uniform small particles, thereby promoting the hydrolysis of the urea solution and improving the ammonia discharging efficiency, and the electronic control unit can realize the local heating of the heating resistance wire mesh column, thereby realizing the heating of the small particles of the urea solution under the low temperature condition, promoting the decomposition of the small particles of the urea solution, and greatly reducing the pressure for the calibration of the post-treatment SCR due to the reduction of the starting spraying temperature condition of the SCR while reducing the risk of crystallization;
(2) only the heating resistance wire net column is locally heated, and the requirements on current and control are low;
(3) through closed-loop control, according to temperature sensor's change and actual demand, the heating power is adjusted, realizes the reduction of cost, has improved the utilization efficiency.
Drawings
FIG. 1 is a schematic structural view of a main body of an adaptive heating urea decomposition device according to an embodiment;
FIG. 2 is a plan view of the main structure of the self-adaptive heating urea decomposition device according to the embodiment;
FIG. 3 is a diagram showing an operating state of an adaptive heating urea decomposition device according to an embodiment;
reference numerals: the device comprises a heating resistance wire net column 1, a temperature sensor 2, a heating electrode 3, an electronic control unit 4, a ceramic heat insulation ring 5, a urea nozzle 6 and a urea spray 7.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
As shown in fig. 1-2, a self-adaptive heating type urea decomposition device comprises a heating resistance wire net column 1, a temperature sensor 2, a heating electrode 3, an electronic control unit 4 and a ceramic heat insulation ring 5; and a closed loop structure is formed among the temperature sensor 2, the heating resistance wire net column 1, the electronic control unit 4 and the heating electrode 3.
The heating resistance wire net column 1 is arranged right below the urea nozzle 6, and the center of the heating resistance wire net column 1 is aligned with the center of the urea nozzle 6.
Further, the heating resistance wire net column 1 is a cylindrical structure formed by a plurality of net-shaped resistance wires. Therefore, on one hand, when the urea spray 7 is sprayed on the heating resistance wire net column 1, the urea solution can be crushed into more uniform small particles under the action of the airflow, so that the urea solution is easier to hydrolyze, and the ammonia discharging efficiency is improved; on the other hand, the electronic control unit 4 is used for locally heating the thermal resistance wire mesh column 1, so that small urea solution particles are heated under a low-temperature condition, the decomposition of the small urea solution particles is promoted, and the pressure for calibrating the post-treatment SCR is greatly reduced due to the reduction of the SCR start-up temperature condition while the risk of crystallization is reduced.
The temperature sensor 2 is arranged inside the heating resistance wire net column 1 and is in signal connection with the electronic control unit 4; the temperature sensor 2 detects the temperature change of the heating resistance wire net column 1 in real time and outputs a temperature change data signal to the electronic control unit 4, so that the electronic control unit 4 can conveniently and timely judge whether heating is needed and control the heating power.
Further, the temperature sensor 2 is arranged at the center of the heating resistance wire net column 1, so that the instant temperature of the heating resistance wire net column 1 can be fed back more accurately.
The heating electrode 3 is arranged inside the heating resistance wire net column 1 and is in signal connection with the electronic control unit 4; the heating electrode 3 heats or stops heating the heating resistance wire net column 1 by receiving a heating or heating stopping data signal sent by the electronic control unit 4.
The electronic control unit 4 is mainly responsible for controlling the heating of the heating resistance wire net column 1, a computer system of the electronic control unit 4 judges whether heating is needed or not according to a received temperature change data signal of the temperature sensor 2, and feeds a control signal back to the heating electrode 3 to control the heating electrode 3 to heat or stop heating the heating resistance wire net column 1.
The ceramic heat insulation ring 5 is arranged on the periphery of the heating resistance wire net column 1 and plays a heat insulation role, so that heat exchange between the heating resistance wire net column 1 and the outside is reduced, and the heating efficiency is improved.
The working principle of the device is as follows: as shown in fig. 3, when the urea spray 7 is sprayed to the heating resistance wire net column 1, if the temperature sensor 2 detects that the temperature of the heating resistance wire net column 1 is lower than a set value, the temperature is fed back to the electronic control unit 4, and after the electronic control unit 4 judges that heating is needed, the heating power is controlled and the heating resistance wire net column 1 is heated through the heating electrode 3, so that the temperature of the urea spray 7 is increased, the hydrolysis of the solution is promoted, and the anti-crystallization risk is enhanced; when the temperature of the heating resistance wire net column 1 reaches a set value, the temperature sensor 2 outputs the detected information to the electronic control unit 4, and the electronic control unit 4 stops heating operation after judging that the heating needs to be stopped. The whole process is controlled in a closed loop mode, heating power is adjusted according to the change of the temperature sensor 2, the use cost is reduced, and the utilization efficiency is improved.
Experiments show that the ammonia gas has high efficiency in the catalyst at about 120 ℃, but the urea solution needs to be hydrolyzed at more than 180 ℃, the urea injection device can promote the hydrolysis in a heating mode, can perform urea injection when the engine has low exhaust temperature, and can greatly reduce the pressure of aftertreatment calibration even in the seventh stage of China.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited thereto, and that various changes and modifications may be made without departing from the spirit of the invention, and the scope of the invention is defined in the appended claims.
Claims (5)
1. A self-adaptive heating type urea decomposition device is characterized by comprising a heating resistance wire net column, a temperature sensor, a heating electrode and an electronic control unit;
the heating resistance wire net column is arranged right below the urea nozzle; the temperature sensor and the heating electrode are arranged inside the heating resistance wire net column and are connected with the electronic control unit;
and a closed loop structure is formed among the temperature sensor, the heating resistance wire net column, the electronic control unit and the heating electrode.
2. The apparatus of claim 1, wherein the center of the mesh column of heating resistance wires is aligned with the center of the urea nozzle.
3. The self-adaptive heating type urea decomposition device according to claim 2, wherein the heating resistance wire mesh column is a cylindrical structure composed of a plurality of mesh resistance wires.
4. The apparatus of claim 1, wherein the temperature sensor is disposed at the center of the grid of heating resistance wires.
5. The self-adaptive heating type urea decomposition device according to any one of claims 1 to 4, wherein a ceramic heat insulation ring is arranged on the periphery of the heating resistance wire net column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110421625.5A CN113153497A (en) | 2021-04-20 | 2021-04-20 | Self-adaptation adds fever type urea decomposition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110421625.5A CN113153497A (en) | 2021-04-20 | 2021-04-20 | Self-adaptation adds fever type urea decomposition device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113153497A true CN113153497A (en) | 2021-07-23 |
Family
ID=76869209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110421625.5A Pending CN113153497A (en) | 2021-04-20 | 2021-04-20 | Self-adaptation adds fever type urea decomposition device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113153497A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266938A (en) * | 2013-05-21 | 2013-08-28 | 中国第一汽车股份有限公司 | Gas-assisted urea injection system with mixing tube heating method adopted |
| EP2826973A1 (en) * | 2013-07-18 | 2015-01-21 | FPT Motorenforschung AG | System for preventing the urea crystal formation within an exhaust gas after treatment system |
| CN106468202A (en) * | 2015-08-17 | 2017-03-01 | 上海柴油机股份有限公司 | A kind of diesel engine after treatment crystallization-preventive heating and mixing device |
| KR20170045994A (en) * | 2015-10-20 | 2017-04-28 | 현대중공업 주식회사 | Apparatus for Energy Saving Ammonia Generation in SCR System |
| CN206830276U (en) * | 2017-01-06 | 2018-01-02 | 潍柴动力股份有限公司 | A kind of electrical heating urea blender and SCR system |
| WO2018077005A1 (en) * | 2016-10-26 | 2018-05-03 | 天纳克（苏州）排放系统有限公司 | Urea tube having one-way throttling function, urea spraying system and control method therefor |
| JP2018128006A (en) * | 2017-02-09 | 2018-08-16 | エヌ・イーケムキャット株式会社 | Exhaust emission control device |
| CN108729990A (en) * | 2017-04-20 | 2018-11-02 | 北华航天工业学院 | A kind of diesel engine after treatment heating and mixing device of anti-urea crystals |
| CN109458245A (en) * | 2018-09-28 | 2019-03-12 | 江苏大学 | A kind of system promoting SCR conversion efficiency using vehicle exhaust thermo-electric generation |
-
2021
- 2021-04-20 CN CN202110421625.5A patent/CN113153497A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266938A (en) * | 2013-05-21 | 2013-08-28 | 中国第一汽车股份有限公司 | Gas-assisted urea injection system with mixing tube heating method adopted |
| EP2826973A1 (en) * | 2013-07-18 | 2015-01-21 | FPT Motorenforschung AG | System for preventing the urea crystal formation within an exhaust gas after treatment system |
| CN106468202A (en) * | 2015-08-17 | 2017-03-01 | 上海柴油机股份有限公司 | A kind of diesel engine after treatment crystallization-preventive heating and mixing device |
| KR20170045994A (en) * | 2015-10-20 | 2017-04-28 | 현대중공업 주식회사 | Apparatus for Energy Saving Ammonia Generation in SCR System |
| WO2018077005A1 (en) * | 2016-10-26 | 2018-05-03 | 天纳克（苏州）排放系统有限公司 | Urea tube having one-way throttling function, urea spraying system and control method therefor |
| CN206830276U (en) * | 2017-01-06 | 2018-01-02 | 潍柴动力股份有限公司 | A kind of electrical heating urea blender and SCR system |
| JP2018128006A (en) * | 2017-02-09 | 2018-08-16 | エヌ・イーケムキャット株式会社 | Exhaust emission control device |
| CN108729990A (en) * | 2017-04-20 | 2018-11-02 | 北华航天工业学院 | A kind of diesel engine after treatment heating and mixing device of anti-urea crystals |
| CN109458245A (en) * | 2018-09-28 | 2019-03-12 | 江苏大学 | A kind of system promoting SCR conversion efficiency using vehicle exhaust thermo-electric generation |
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Application publication date: 20210723 |