CN205135842U - EGR exhaust gas recirculation system that optimizes - Google Patents
EGR exhaust gas recirculation system that optimizes Download PDFInfo
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- CN205135842U CN205135842U CN201520861742.3U CN201520861742U CN205135842U CN 205135842 U CN205135842 U CN 205135842U CN 201520861742 U CN201520861742 U CN 201520861742U CN 205135842 U CN205135842 U CN 205135842U
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- egr
- electronic valve
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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
- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model discloses a EGR exhaust gas recirculation system that optimizes, two tunnel outputs are connected through the blast pipe to the gas vent of diesel engine, connect gradually the turbine through the blast pipe all the way, compressor and intercooler, another sweetgum fruit is crossed the blast pipe and is connected gradually EGR bypass valve and EGR cooler, the delivery outlet of intercooler and EGR cooler is all through the air inlet of intake -tube connection in the diesel engine, still include the EGR electronic valve, the input port of EGR electronic valve passes through the pipeline and is connected with the blast pipe, the delivery outlet of EGR electronic valve passes through the input port of pipe connection cooler, be equipped with speedtransmitter on the pipeline between EGR electronic valve and the cooler, be equipped with temperature sensor on the pipeline of intercooler output, the signal input part of controller and speedtransmitter and temperature sensor's signal output part are connected, and the output of controller is connected with the control signal input part of EGR electronic valve. Can obtain a best equilibrium point in energy -conservation and reduction of discharging at assurance boats and ships diesel engine.
Description
Technical field
The utility model relates to the exhaust gas recirculation field of diesel engine, is specifically related to a kind of EGR gas recirculation system with control system of optimization.
Background technique
Along with the deterioration of grobal environment and the reinforcement of people's environmental consciousness, regulation, the technology of oil pollution from vessels are very huge in change in recent years, and the requirement controlling motor noxious gas emission is strong.The concern of people has day by day been caused based on the environmental pollution of the pollutant emission of boat diesel engine.The control that world maritime tissue pollutes boats and ships active force and diesel engine is also more and more stricter.Diesel engine and the energy thereof have become a kind of inevitable trend to environmental protection future development.
On October 10th, 2008; Marine Environmental Protection Committee (MPEC) meeting of IMO is passed through the amendment of VI of MARPOL73/78 supplemental provisions; define the IMO marine diesel engine emission standard system comprising three ranks; add more strict Tier III standard, agree to realize emission reduction targets: within 2016, reach stricter Tier III at emission control region (ECAs).IMO emission standard is increasingly strict, the technical measures meeting Tier III stage regulation are mainly following three kinds: on the diesel engine type meeting Tier III Abgasgesetz, install selective catalytic reduction (SCR) technology or EGR (EGR) technology additional, and dual-fuel diesel engine rock gas pattern.Current SCR technology is compared to other technologies, and more flexibly, technology is also relatively more ripe.So many great diesel engine manufacturers have selected SCR technology deal with Tier III Abgasgesetz.But SCR technology also has its drawback, this investment in machinery and equipment and operating cost are all relative high, and therefore each marine diesel engine manufacturer does not all abandon carrying out Exploration & stu dy to the EGR technology of relative inexpensiveness.
External for EGR (EGR) systematic research, on automobile-used, there is very large progress, and also egr system peculiar to vessel has been conducted a preliminary study.Primary Study for egr system finds, EGR effectively can lower the discharge of NOX really, but but affects to some extent for the power performance of diesel engine, and is not under all conditions of operation, and egr system can run.Along with different operating modes, EGR rate will change, even egr system will be closed, therefore simple egr system can not the strict emission standard in the satisfied world of maximum utility, therefore more research emphasis is placed on EGR (EGR) system abroad to combine with other technologies, thus reduces the discharge of NOX.
EGR and charging air humidification combine with technique technology, Modern Heavy Industrial Co., Ltd (HHI) is in research charging air humidification (ChAM) technology.Be exactly use water vapour humidifying air, HHI by reducing the discharge of NOX on a medium speed diesel by ERG combine with technique ChAM system, and conclusion by experiment.This technology can as one effective means reply Tier III regulation.The egr system of diesel engine can reduce the discharge 60%, EGR of NOX and supercharging humidifying air technique system to reduce the discharge 75% of NOX, meets the emission standard of the NOX of IMOTier III.
EGR technology and rear injection (POST-INJECYION) combine with technique, high EGR rate result in unnecessary and unacceptable soot emissions, even increases air Injection pressure.In order to reduce these soot emissions, just create the combination of rear spray technique and EGR technology.Rear spray technique proves a kind of effective carbon emission reduction measure.When adopting EGR Technology, the flue dust discharge capacity in waste gas can inevitably rise.This can apply many spraying techniques, is exactly to use rear spraying technique in the main road that sprays, and this is a kind of effective measures that can reduce increase flue dust, and experimental result represents, carbon discharge capacity can reduce to 40% by rear drainage technique.
EGR and miller cycle, two-stage turbocharger combination technology, miller cycle reduces the discharge of NOX, because it controls lower gas in the jar temperature, improve cycle efficiency, this technology was used to meet Tier II emission standard at that time.Need stronger miller cycle when there being very high boost pressure, there is good prospect the discharge aspect reducing NOX that is combined in of stronger miller cycle and two-stage supercharging.The two combines and probably can reduce NOX discharge 50%, though do not meet the emission standard of Tier III, but will be considered as a kind of means tackling emission standard in conjunction with EGR technology.
EGR and HAM combination technology, HAM (HumidAirMotor), be a kind of modified model air inlet humidification system of German MuntersEuroform company exploitation at first, HAM system is made up of the heat exchanger of humidifier, recycle pump, increase water temperature, bleed-off system, water tank and filter etc.Its working principle is that this wet air enters cylinder combustion with the air inlet in water vapor humidification suction tude, combustion temperature is reduced thus reduces the generation of NOX, and the combination of itself and egr system will be a kind of very large improvement.
EGR and WEF combination technology, WEF (WaterEmulsifiedFuel) technology be use water-soluble enter oil formed oil emulsion, before oil spout, fuel oil and water are carried out emulsification, spraying into cylinder, the advantage of this technology of low NOX emission 20% ~ 30% can be fallen: design does not need special change, on the stability of fuel oil without impact.Even if the water yield reaches 30%, also do not affect fuel consumption rate, be conducive to smoke evacuation, water consumption rate is low, and investment cost is low.For two stroke diesel engine, use EGR & WEF combination technology newly developed effectively can tackle IMOTier III Abgasgesetz.Use the motor of EGR and WEF combination technology, the consumption that effectively can reduce nitrogen oxide and fuel oil is lost.Have the experiment of experiment to MANB & W2S50ME-C motor, EGR & WEF combination technology can make the discharge of nitrogen oxide reach the reduction of discharging of expection.
China controls to start late to exhaust emissions of diesel engine, standard is relative loose also, therefore there is certain gap in corresponding level of purification compared with developed country, and domestic emphasis in reduction exhaust emissions of diesel engine is limited to the research of fuel oil for vehicles system and exhaust system substantially at present.Also the research of boats and ships egr system is devoted to domestic recent years, the research of the control measure of the carrying out of such as Wuhan University of Technology marine diesel engine emission measure and egr system peculiar to vessel, Li Jianghua and Jiang Yanqiao is published in " EquipmentManufactringTechnology ", and " technical research of boat diesel engine NOX emission control " of 2009 has carried out a series of research to the mechanism of production of NOX peculiar to vessel, and compare the technology that several minimizing boats and ships NOX discharges, to NOX purifying effect, rate of fuel consumption, the impact of smoke intensity is analyzed, and the purifying effect to wherein main purification technics, investment cost and operating cost etc. compare analysis.And analyze the improvement that the advantage of EGR technology peculiar to vessel and needs are made." turbo-charged diesel high pressure spray in the evening combustion characteristic three-dimensional simulation research " of Wuhan University of Technology master's dissertation Li Hui in 2014 have studied the impact of EGR on diesel engine spray in evening combustion and emission characteristic from experiment and simulation two aspects, and obtain the increase of EGR rate, in cylinder, middle pressure and temperature reduce gradually, and NOX discharges significantly reduced result.
During ocean vessel sailing, due to the change of environment, the temperature of boat diesel engine air inlet also can change, thus NOX in heavy oil combustion process is had an impact, the change of the circulation inflammable matter simultaneously in exhaust, have a great impact, but traditional EGR only considers flow and the temperature of EGR to the work cycle variation of diesel engine, have ignored EGR key element and intake temperature is carried out to the control of proper fit, thus effectively can not construct best EGR rate.In order to make boat diesel engine in different operating modes, different intake temperature, and under the ratio of circulation inflammable matter in different exhausts, realize the control of Optimum EGR rate, meet requirement that is energy-conservation and that reduce discharging simultaneously, need be optimized original EGR and control system thereof.
Summary of the invention:
The purpose of this utility model is to provide a kind of EGR gas recirculation system of optimization, can guarantee boat diesel engine energy-conservation with reduction of discharging on obtain an optimal balance point, to overcome Problems existing in background technique.
To achieve these goals, the technical solution of the utility model is:
A kind of EGR gas recirculation system of optimization, be characterized in: the relief opening of diesel engine connects two-way through outlet pipe and exports, outlet pipe of leading up to connects turbo machine successively, compressor and intercooler, outlet pipe of separately leading up to connects EGR bypass valve and cooler for recycled exhaust gas successively, the delivery outlet of intercooler and cooler for recycled exhaust gas is all connected to the suction port of diesel engine by suction tude, also comprise EGR electronic valve, the inlet opening of EGR electronic valve is connected with outlet pipe by pipeline, the delivery outlet of EGR electronic valve connects the inlet opening of cooler by pipeline, pipeline between EGR electronic valve and cooler is provided with velocity transducer, the pipeline that intercooler exports is provided with temperature transducer, also comprise controller, the signal input part of controller is connected with the signal output part of velocity transducer and temperature transducer, and the output terminal of controller is connected with the control signal input end of EGR electronic valve.
Preferably, also comprise oxidation catalytic converter, the inlet opening of oxidation catalytic converter is connected to the delivery outlet of EGR electronic valve by pipeline, and the delivery outlet of oxidation catalytic converter is connected to the inlet opening of cooler for recycled exhaust gas.
Preferably, oxidation catalytic converter is binary oxidation catalytic converter.
Preferably, controller is PLC.
The beneficial effects of the utility model are: EGR electronic valve is opened and closed to control it by controller, instead of the pressure of traditional dependence waste gas controls its unlatching, therefore controls more accurate, more can ensure the optimization of EGR rate.By the waste gas of EGR electronic valve, then through oxidation catalytic converter, the inflammable matter in waste gas is changed into CO2 and H2O, provide necessary safety margin and carry out stable operation EGR gas recirculation system, the using scope of EG gas recirculation system R can be expanded.The pipeline of intercooler output port is provided with temperature transducer, can measure the temperature of air inlet, intake temperature and EGR rate are related, by such setting, can for subsequently through intake temperature regulate EGR rate hardware supports is provided, thus energy-conservation and discharge between obtain largest optimization.Pass to controller after temperature transducer and velocity transducer collection signal, controller according to the data information that obtains to the opening and closing of control EGR electronic valve, can guarantee boat diesel engine energy-conservation with reduction of discharging on obtain an optimal balance point.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment,
PLC control flow chart in Fig. 2 position this practical information embodiment application.
In figure: 1-diesel engine, 2-turbo machine, 3-compressor, 4-intercooler, 5-EGR bypass valve, 6-EGR cooler, 7-outlet pipe, 8-suction tude, 9-EGR electronic valve, 10-velocity transducer, 11-temperature transducer, 12-controller, 13-oxidation catalytic converter.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
A kind of EGR gas recirculation system (Fig. 1) of optimization, the relief opening of diesel engine connects two-way through outlet pipe and exports, outlet pipe of leading up to connects turbo machine successively, compressor and intercooler, outlet pipe of separately leading up to connects EGR bypass valve and cooler for recycled exhaust gas successively, the delivery outlet of intercooler and cooler for recycled exhaust gas is all connected to the suction port of diesel engine by suction tude, also comprise EGR electronic valve, the inlet opening of EGR electronic valve is connected with outlet pipe by pipeline, the delivery outlet of EGR electronic valve connects the inlet opening of cooler by pipeline, pipeline between EGR electronic valve and cooler is provided with velocity transducer, the pipeline that intercooler exports is provided with temperature transducer, also comprise controller, the signal input part of controller is connected with the signal output part of velocity transducer and temperature transducer, and the output terminal of controller is connected with the control signal input end of EGR electronic valve.Also comprise oxidation catalytic converter, the inlet opening of oxidation catalytic converter is connected to the delivery outlet of EGR electronic valve by pipeline, and the delivery outlet of oxidation catalytic converter is connected to the inlet opening of cooler for recycled exhaust gas.
Oxidation catalytic converter is binary oxidation catalytic converter, and controller is PLC.
During ocean vessel sailing, due to the change of environment, the temperature of boat diesel engine air inlet also can change, but intake temperature and EGR rate are related, EGR rate required for different intake temperature is different situation, egr system can make the race way of the operation meeting entry altitude instability of diesel engine simultaneously, causes the change of the circulation inflammable matter in exhaust subsequently, has a great impact the work cycle variation of diesel engine.By being optimized EGR and control system thereof, intake temperature and the waste gas flowing velocity by EGR electronic valve is tested with temperature transducer and velocity transducer, PID is adopted to regulate, can ensure that PID controls the feature of floating, good static stability, have again the feature that fuzzy control adaptive ability is strong, dynamic performance is good concurrently, in the unaccommodated situation of operating mode, with the closedown of PLC programming Control EGR electronic valve, both met the control overflow of system, and can reduce again and control cost.
The pipeline of EGR electronic valve output port is provided with velocity transducer, the intake velocity of waste gas can be responded to, compare with given speed, feed back in EGR electronic valve by PLC, the opening time of adjustment electronic valve, thus make EGR rate reach optimum seat.Simultaneously have relevant setting value in PLC program, in time being not suitable for EGR, directly control EGR electronic valve and the closedown of bypass valve, the stable operation of guarantee diesel engine.The data measured by temperature transducer and velocity transducer can be shown and record, so that administrative staff carry out further research and analysis, are convenient to administrative staff and carry out maintenance and management.
After EGR electronic valve, arrange oxidation catalytic converter changes into CO inflammable matter simultaneously
2with water H
2o, it provides necessary safety margin and carrys out stable operation EGR.Therefore the production of nitrogen oxide can be reduced, although excessive EGR causes the violent decline of NOX, the race way of the operation meeting entry altitude instability of diesel engine.This instability to a great extent with extend firing time and and cylinder in partial combustion relevant, partial combustion is because the increase of CO2 in diesel engine intake and the minimizing of O2 are formed, the deterioration of combustion efficiency can cause the fluctuation of products of combustion, and this fluctuation can make the variation aggravation of cylinder charge on temperature, pressure and composition.Waste gas in Diesel Engine Exhaust Pipe, enters oxidation catalytic converter by electronics EGR electronic valve, the inflammable matter in waste gas is changed into CO2 and H2O, it provides necessary safety margin and carrys out stable operation EGR, expand the using scope of EGR simultaneously.There is larger Economy, practicability and social value.
Adopt PLC as the core (Fig. 2) of control system, application intelligent control algorithm, and adopt two-step evolution network mode to come monitoring and control task.The PLC control system of system adopts the Field bus based on Profibus-DP to carry out networking.Temperature transducer and velocity transducer is set up, for gathering measurement signal and output signal after suction tude intercooler, after EGR electronic valve, respectively.This system can according to the control of factor realization to EGR electronic valve such as the different operating modes of temperature conditions, ship navigation state and diesel engine, and Lookup protocol goes out optimum EGR rate, thus reduces the discharge of NOX as much as possible, ensures diesel engine stable operation.This system can show and record, so that administrative staff carry out further research and analysis data such as intake temperature, waste gas combustible thing, diesel engine speeds.Also can show and record warning simultaneously, and give the support information of relative alarm, be convenient to administrative staff and carry out maintenance and management.
The opening time length of EGR electronic valve is controlled by PLC, suction tude is provided with temperature transducer after intercooler, be used for measuring the temperature of air inlet, the temperature recorded is sent to PLC control system, this system can provide the optimum value of speed automatically according to intake temperature, the speed now entering waste gas can be measured by the velocity transducer after EGR electronic valve, speed of measuring is compared by control system and given speed, by the two comparison effect feedback and EGR electronic valve, thus the opening time length of control EGR electronic valve, ensure the equinoctial point entered in energy-conserving and environment-protective of waste gas, reduce the generation of NOX as much as possible simultaneously, there is larger use value.Can according to the control of factor realization to electronics EGR valve such as the different operating modes of intake temperature condition, ship navigation state and diesel engine, Lookup protocol goes out optimum EGR rate, thus reduce the discharge of NOX as much as possible, and between energy-conservation and environmental protection, pursue equinoctial point, more with practical value.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to the utility model claims.The part be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (4)
1. the EGR gas recirculation system optimized, it is characterized in that: the relief opening of diesel engine connects two-way through outlet pipe and exports, outlet pipe of leading up to connects turbo machine successively, compressor and intercooler, outlet pipe of separately leading up to connects EGR bypass valve and cooler for recycled exhaust gas successively, the delivery outlet of described intercooler and described cooler for recycled exhaust gas is all connected to the suction port of described diesel engine by suction tude, also comprise EGR electronic valve, the inlet opening of described EGR electronic valve is connected with described outlet pipe by pipeline, the delivery outlet of described EGR electronic valve connects the inlet opening of described cooler by pipeline, pipeline between described EGR electronic valve and described cooler is provided with velocity transducer, the pipeline that described intercooler exports is provided with temperature transducer, also comprise controller, the signal input part of described controller is connected with the signal output part of described velocity transducer and described temperature transducer, and the output terminal of described controller is connected with the control signal input end of described EGR electronic valve.
2. the EGR gas recirculation system of a kind of optimization according to claim 1, it is characterized in that: also comprise oxidation catalytic converter, the inlet opening of described oxidation catalytic converter is connected to the delivery outlet of described EGR electronic valve by pipeline, the delivery outlet of described oxidation catalytic converter is connected to the inlet opening of described cooler for recycled exhaust gas.
3. the EGR gas recirculation system of a kind of optimization according to claim 2, is characterized in that: described oxidation catalytic converter is binary oxidation catalytic converter.
4. the EGR gas recirculation system of a kind of optimization according to claim 1, is characterized in that: described controller is PLC.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520861742.3U CN205135842U (en) | 2015-10-30 | 2015-10-30 | EGR exhaust gas recirculation system that optimizes |
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| CN201520861742.3U CN205135842U (en) | 2015-10-30 | 2015-10-30 | EGR exhaust gas recirculation system that optimizes |
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| CN205135842U true CN205135842U (en) | 2016-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111752148A (en) * | 2020-06-03 | 2020-10-09 | 武汉理工大学 | Self-adaptive controller and method applied to ship waste gas utilization system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111752148A (en) * | 2020-06-03 | 2020-10-09 | 武汉理工大学 | Self-adaptive controller and method applied to ship waste gas utilization system |
| CN111752148B (en) * | 2020-06-03 | 2022-04-15 | 武汉理工大学 | Self-adaptive controller and method applied to ship waste gas utilization system |
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Legal Events
| Date | Code | Title | Description |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160406 Termination date: 20161030 |