CN202718734U - Environment friendly tail gas exhaust system - Google Patents
Environment friendly tail gas exhaust system Download PDFInfo
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- CN202718734U CN202718734U CN2012203433538U CN201220343353U CN202718734U CN 202718734 U CN202718734 U CN 202718734U CN 2012203433538 U CN2012203433538 U CN 2012203433538U CN 201220343353 U CN201220343353 U CN 201220343353U CN 202718734 U CN202718734 U CN 202718734U
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- urea
- outlet pipe
- tail gas
- nozzle
- temperature
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- 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
Abstract
The utility model belongs to the technical field of environmental friendliness, and in particular relates to an environment friendly tail gas exhaust system, which solves the technical problems of inaccuracy in urea solution jetting quantity in existing tail gas exhaust, and the like. The environment friendly tail gas exhaust system comprises a nozzle arranged on an exhaust pipe, wherein the nozzle is connected with a urea jetting pump, the urea jetting pump is respectively connected with an ECU (Electronic Control Unit) and a urea storage unit, the ECU controls the urea jetting pump for releasing a urea solution, the urea solution is jetted to a post-treater on the exhaust pipe through the nozzle, and the post-treater is connected with an OBD (On Board Diagnostic) system which is capable of feeding temperature information in the exhaust pipe and the post-treater and a treating result of NOx in the exhaust pipe to the ECU. Compared with the prior art, the environment friendly tail gas exhaust system has the advantages of being reasonable in design and simple in structure, accurately controlling the jetting quantity of the urea solution, preventing crystallization blockage of the nozzle, being capable of effectively preventing temperatures of the exhaust pipe and a reaction cavity from being overhigh, and being good in stability and lower in cost.
Description
Technical field
The utility model belongs to environmental technology field, relates to exhaust gas processing device, especially relates to a kind of environment protection tail gas exhausting system.
Background technique
The development of ic engine industry plays a part very important in the Development of Human Civilization history, and also closely bound up with the mankind's life in present stage.The environmental pollution problem that engine exhaust causes has caused the whole mankind's common concern.Energy shortage, environmental pollution and disruption of ecological balance become human society three large problems serious, in the urgent need to address.Be accompanied by the formation and development of people's sustainable development idea, seeking mutually promoting of society, economy, population and resource, environment becomes world trends with developing in harmony.Reduce the diesel engine gas discharging, become the problem that the whole world faces.
In order to protect the environment of this country, the nearly all country all discharging of combustion motor limits.At present, the Abgasgesetz of carrying out in the world mainly contains the U.S., Europe and Japan's three large systems, and wherein the emission standard system of US and European is extensively quoted by various countries.The one, take EGR+DPF/DOC as main U.S.'s route, but because gas recirculation system (EGR) technology, can not obtain preferably fuel oil and particle trap/oxidation catalytic converter (DPF/DOC) in the situation that engine emission reaches Europe IV level, relatively more responsive to the sulphur in the fuel oil, promote in China so this route is difficult in a short time; The 2nd, take SCR (selective catalytic reduction) technology as main European route, the related data of foreign study SCR technology shows: the NOx transformation efficiency is high, reduce discharging and reduce the direct contradiction of nothing between the oil consumption, according to related data both domestic and external, adopt the SCR technology to meet the diesel engine of Europe IV emission standard, than not adopting the SCR technology to meet the diesel engine of Europe III emission standard, fuel consume can reduce more than 5%.Therefore, adopt the SCR system to reduce discharging, be fit to China's actual conditions.But because ammonia is harmful gas, in the SCR system as reducing agent with ammoniacal liquor or urea, reduction reaction does not occur with NOx in the reducing agent that too much sprays into, and easily causes the nozzle crystallization, and unreacted reducing agent at high temperature enters in the atmosphere, causes secondary environmental pollution; The very few reducing agent that sprays into causes the NOx reaction not exclusively, can not reach the standard of exhaust emissions, so according to engine operating condition and the warm requirement to urea liquid of motor row, the realization accurate measurement is sprayed, and seems of crucial importance.
The problem that exists in order to solve prior art, people have carried out long-term exploration, have proposed solution miscellaneous.For example, Chinese patent literature discloses a kind of diesel engine SCR urea injection apparatus [application number: CN201120341173.1], it comprises mixing chamber, gas source inlet, urea import and drain pipe are set on the mixing chamber, on the described gas source inlet successively pipeline connect air pressure maintaining valve and air solenoid valve, be fixedly installed nozzle in the described urea import, on the nozzle successively pipeline connect safety pressure-limiting valve, gear pump, urea filter cleaner and urea tank, described drain pipe tail end connects the mechanical type atomizer, and atomizer is arranged on the outlet pipe of outside diesel engine.
Such scheme is realized the quantitative injection of aqueous solution of urea by the electromagnetism nozzle; the reliability of elevator system to a certain extent; it is comparatively complicated that but such scheme still exists structure; urea solution jet amount inaccuracy; easily cause the nozzle Crystallization Plugging, reaction chamber and Tail Pipe Temperature be too high the technical problem such as can't protect.
Summary of the invention
The purpose of this utility model is for the problems referred to above, provides a kind of reasonable in design, simple in structure, and accurate measurement is sprayed, the environment protection tail gas exhausting system that treatment effect is good.
For achieving the above object, the utility model has adopted following technical proposal: this environment protection tail gas exhausting system, be connected on the gas exhaust piping, it is characterized in that, native system comprises the nozzle that is arranged on the outlet pipe, described nozzle links to each other with the urea-spray pump, described urea-spray pump is connected with respectively electronic control unit ECU and urea storage unit, described electronic control unit ECU is by the urea liquid in the emission electrical signal control urea-spray pump release urea storage unit, in the preprocessor that is arranged on the outlet pipe, described preprocessor is connected with the vehicle-mounted discharge diagnosis unit OBD that the processing result of NOx in the temperature information in the outlet pipe and the temperature information in the preprocessor and the outlet pipe can be fed back to electronic control unit ECU to described urea liquid by nozzle ejection.
Because vehicle-mounted discharge diagnosis unit OBD can be timely the processing result of NOx in the temperature information in the outlet pipe and the temperature information in the preprocessor and the outlet pipe is fed back to electronic control unit ECU, electronic control unit ECU can accurately control the emitted dose of urea liquid and can prevent the excess Temperature of preprocessor and outlet pipe.
In above-mentioned environment protection tail gas exhausting system, described vehicle-mounted discharge diagnosis unit OBD comprises for the first temperature transducer of the temperature that shows preprocessor and is used for showing the second temperature transducer of the temperature of outlet pipe, and the NOx sensor that is used for the processing result of demonstration outlet pipe NOx.
Show the second temperature transducer of the temperature of outlet pipe owing to being provided for showing first temperature transducer and being used for of the temperature of preprocessor, and the NOx sensor that is used for the processing result of demonstration outlet pipe NOx, the processing result of temperature in outlet pipe and the preprocessor and NOx in time can be fed back to electronic control unit ECU, prevent the crystallization of nozzle.
In above-mentioned environment protection tail gas exhausting system, described urea storage unit is urea box.
Compared with prior art, this environment protection tail gas exhausting advantage of system is: 1, reasonable in design, simple in structure, accurately control the emitted dose of urea liquid, and prevent the Crystallization Plugging of nozzle; 2, can effectively prevent the excess Temperature of outlet pipe and reaction chamber, good operating stability, cost is lower.
Description of drawings
The structured flowchart that Fig. 1 provides for the utility model.
Among the figure, outlet pipe 1, nozzle 2, urea-spray pump 3, electronic control unit ECU4, preprocessor 5, vehicle-mounted discharge diagnosis unit OBD6, the first temperature transducer 61, the second temperature transducer 62, NOx sensor 63, urea box 7.
Embodiment
The utility model is described in more detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, this environment protection tail gas exhausting system, be connected on the gas exhaust piping, native system comprises the nozzle 2 that is arranged on the outlet pipe 1, nozzle 2 links to each other with urea-spray pump 3, urea-spray pump 3 is connected with respectively electronic control unit ECU4 and urea storage unit, the urea storage unit is urea box 7, the urea liquid that electronic control unit ECU4 discharges in the urea storage unit by emission electrical signal control urea-spray pump 3, urea liquid is ejected in the preprocessor 5 that is arranged on the outlet pipe 1 by nozzle 2, preprocessor 5 is connected with the vehicle-mounted discharge diagnosis unit OBD6 that the processing result of NOx in the temperature information in the temperature information in the outlet pipe 1 and the preprocessor 5 and the outlet pipe 1 can be fed back to electronic control unit ECU4, because vehicle-mounted discharge diagnosis unit OBD6 can be timely the processing result of NOx in the temperature information in the temperature information in the outlet pipe 1 and the preprocessor 5 and the outlet pipe 1 is fed back to electronic control unit ECU4, electronic control unit ECU4 can accurately control the emitted dose of urea liquid and can prevent preprocessor 5 and the excess Temperature of outlet pipe 1.
Vehicle-mounted discharge diagnosis unit OBD6 comprises for the first temperature transducer 61 of the temperature that shows preprocessor 5 and is used for showing the second temperature transducer 62 of the temperature of outlet pipe 1, and the NOx sensor 63 that is used for the processing result of demonstration outlet pipe 1 NOx, temperature in outlet pipe 1 and the preprocessor 5 and the processing result of NOx in time can be fed back to electronic control unit ECU4 like this, prevent the crystallization of nozzle 2.
The principle of the present embodiment is: 7 li dresses of urea box be that (urea and water are according to proper proportion for urea liquid, 32.5% ratio that is generally is mixed), electronic control unit ECU4 generating signal discharges 7 li corresponding pollutants of urea box with the urea liquid of ratio to urea-spray pump 3, arrive preprocessor 5 by nozzle 2, in the time of more than preprocessor 5 temperature to 300 ℃ (delivery temperature of diesel engine is generally in 300 ℃ ~ 500 ℃ scope), selective catalysis NOx, make NOx be reduced into harmless N2 and H2O, discharge atmosphere by outlet pipe 1.
Its chemical equation is as follows:
CO (NH2) 2+H2O → 2NH3+CO2(urea just can be hydrolyzed into ammonia, carbon dioxide at normal temperatures);
4NH3+2NO2+O2 → 3N2+6H2O (ammonia and NO2 effect generate the ammonia G﹠W, the ammonia volatilization);
4NH3+4NO+O2 → 4N2+H2O (ammonia and NO2 effect generate the ammonia G﹠W, the ammonia volatilization); Preprocessor 5 is connected with two temperature transducers, the temperature of a demonstration preprocessor 5, the temperature of a demonstration outlet pipe 1; Also has a NOx sensor, the processing result of NOx in the reaction and display oxynitrides chemical reaction final vacuum pipe 1, when pollutant does not have chemical treatment perfect (urea has lacked), exhaust NOx ratio surpasses at 3/7 o'clock, and the NOx sensor just feeds back to electronic control unit ECU4; Otherwise the urea spray is many, and chemical reaction is excessive, just produces crystallization in the outlet pipe 1, feeds back to equally electronic control unit ECU4.
Specific embodiment described herein only is to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although this paper has more used the terms such as outlet pipe 1, nozzle 2, urea-spray pump 3, electronic control unit ECU4, preprocessor 5, vehicle-mounted discharge diagnosis unit OBD6, the first temperature transducer 61, the second temperature transducer 62, NOx sensor 63, urea box 7, do not get rid of the possibility of using other term.Using these terms only is in order to describe more easily and explain essence of the present utility model; They are construed to any additional restriction all is contrary with the utility model spirit.
Claims (3)
1. environment protection tail gas exhausting system, be connected on the gas exhaust piping, it is characterized in that, native system comprises the nozzle (2) that is arranged on the outlet pipe (1), described nozzle (2) links to each other with urea-spray pump (3), described urea-spray pump (3) is connected with respectively electronic control unit ECU(4) and the urea storage unit, described electronic control unit ECU(4) by the urea liquid in emission electrical signal control urea-spray pump (3) the release urea storage unit, described urea liquid is ejected into by nozzle (2) in the preprocessor (5) that is arranged on the outlet pipe (1), and described preprocessor (5) is connected with and the processing result of NOx in the temperature information in the temperature information in the outlet pipe (1) and the preprocessor (5) and the outlet pipe (1) can be fed back to electronic control unit ECU(4) vehicle-mounted discharge diagnosis unit OBD(6).
2. environment protection tail gas exhausting according to claim 1 system, it is characterized in that, described vehicle-mounted discharge diagnosis unit OBD(6) comprise for first temperature transducer (61) of the temperature that shows preprocessor (5) and be used for showing second temperature transducer (62) of the temperature of outlet pipe (1), and the NOx sensor (63) that is used for showing the processing result of outlet pipe (1) NOx.
3. environment protection tail gas exhausting according to claim 1 and 2 system is characterized in that, described urea storage unit is urea box (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203433538U CN202718734U (en) | 2012-07-16 | 2012-07-16 | Environment friendly tail gas exhaust system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203433538U CN202718734U (en) | 2012-07-16 | 2012-07-16 | Environment friendly tail gas exhaust system |
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| Publication Number | Publication Date |
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| CN202718734U true CN202718734U (en) | 2013-02-06 |
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| CN2012203433538U Expired - Fee Related CN202718734U (en) | 2012-07-16 | 2012-07-16 | Environment friendly tail gas exhaust system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106988839A (en) * | 2017-05-26 | 2017-07-28 | 凯龙高科技股份有限公司 | Meet the diesel engine post-processing system of in-use automotive NOx and PM emission control |
| CN107191251A (en) * | 2017-05-26 | 2017-09-22 | 凯龙高科技股份有限公司 | A kind of diesel engine post-processing system for meeting the discharge of state six |
| CN108194174A (en) * | 2018-03-06 | 2018-06-22 | 中国第汽车股份有限公司 | The urea solution spraying system and its control method of a kind of crystallization-preventive |
-
2012
- 2012-07-16 CN CN2012203433538U patent/CN202718734U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106988839A (en) * | 2017-05-26 | 2017-07-28 | 凯龙高科技股份有限公司 | Meet the diesel engine post-processing system of in-use automotive NOx and PM emission control |
| CN107191251A (en) * | 2017-05-26 | 2017-09-22 | 凯龙高科技股份有限公司 | A kind of diesel engine post-processing system for meeting the discharge of state six |
| CN108194174A (en) * | 2018-03-06 | 2018-06-22 | 中国第汽车股份有限公司 | The urea solution spraying system and its control method of a kind of crystallization-preventive |
| CN108194174B (en) * | 2018-03-06 | 2023-09-26 | 中国第一汽车股份有限公司 | Anti-crystallization urea solution injection system and control method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130206 Termination date: 20150716 |
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| EXPY | Termination of patent right or utility model |