CN107559080A - Diesel engine post-processing system - Google Patents
Diesel engine post-processing system Download PDFInfo
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- CN107559080A CN107559080A CN201710936550.8A CN201710936550A CN107559080A CN 107559080 A CN107559080 A CN 107559080A CN 201710936550 A CN201710936550 A CN 201710936550A CN 107559080 A CN107559080 A CN 107559080A
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- diesel engine
- blue
- processing system
- urea
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Abstract
The invention discloses a kind of diesel engine post-processing system, including：Blast pipe, catalytic muffler, NOxSensor, add blue tank, metering ejector pump, blender and add cyan nozzle.Wherein, catalytic muffler is connected with blast pipe, for reducing the nitrogen oxides in waste gas and reducing the exhaust noise of engine；Add blue tank and be provided with and add blue pump, sensor and heater, for containing aqueous solution of urea；Metering ejector pump is integrated with measurement controller DCU, and for the calculating of the emitted dose of aqueous solution of urea, measurement controller DCU has OBD functions；Blender is arranged on blast pipe；Add cyan nozzle to be arranged on blender, and be connected by blue tube road with metering ejector pump, the aqueous solution of urea of metering is ejected into blast pipe for the instruction according to measurement controller DCU.The diesel engine post-processing system is reasonable in design, simple in construction, integrated level is high, urea jet atomization efficiency is higher, cost is relatively low.
Description
Technical field
The present invention relates to diesel engine vent gas post processing, more particularly to a kind of diesel engine post-processing system.
Background technology
Existing diesel aftertreatment system SCR system (SCR be Selective (selectivity), Catalytic (catalysis),
Reduction (reduction) english abbreviation) operation principle be to spray reductant into blast pipe, the oxynitrides in exhaust exists
Reacted in the presence of catalyst converter with reducing agent and be reduced into nitrogen and water, the reducing agent that SCR system uses at present is urea.Urine
Plain NH2CONH2Add H2NH is resolved into after O at high temperature3And CO2：
NH2CONH2+H2O-=2NH3+CO2
NH3Again with the NO and NO in exhaust2Reaction produces nitrogen and water：
NO+NO2+2NH3-=2N2+3H2O
4NO+O2+4NH3-=4N2+6H2O
2NO2+O2+4NH3-=3N2+6H2O
In order to prevent the leakage of engine ammonia during whole service life, ammonia catalyst converter is provided with after SCR catalyst,
The NH in this catalyst converter3With O2Reaction generation nitrogen and water：
4NH3+3O2-=2N2+6H2O
Wherein, the standardization aqueous solution of urea of SCR system is referred to as adding indigo plant.
The SCR system used in the prior art generally includes urea injection system, preceding temperature sensor, rear TEMP
Device, NOx sensor, differential pressure pickup, blender and blast pipe.Therefore, SCR system of the prior art is spent in the presence of length
Length, arrangement is not easy, exhaust resistance is big, and gas exhaust piping Crystallization is poor, and the jet atomization effect of urea is poor, effect
The shortcomings of rate is low, low temperature conversion rate is relatively low, and the accuracy of spray of reducing agent is poor, cost is high.
The information for being disclosed in the background section is merely intended to understanding of the increase to the general background of the present invention, without answering
It has been the prior art well known to persons skilled in the art when being considered as recognizing or implying the information structure in any form.
The content of the invention
It is an object of the invention to provide a kind of diesel engine post-processing system, so as to solve system length mistake in the prior art
Long, the problem of integrated level is low and the accuracy of spray of reducing agent is poor.
To achieve the above object, the invention provides a kind of diesel engine post-processing system, it is applied to carry turbocharging
The diesel engine of device, the diesel engine post-processing system include：Blast pipe, it is connected with the engine of diesel engine, comes for receiving
From the waste gas of engine；Catalytic muffler, it is connected with blast pipe, for reducing the nitrogen oxides in waste gas and reducing hair
The exhaust noise of motivation, catalytic muffler include SCR catalyst and engine exhaust muffler, and catalytic muffler includes arrival end
And the port of export, the port of export are provided with temperature sensor；NOxSensor, it is arranged at the port of export of catalytic muffler, for measuring
By the NO in the reacted waste gas of catalytic mufflerxThe concentration of composition；Add blue tank, for containing aqueous solution of urea, add blue tank
It is provided with and adds blue pump, sensor and heater, wherein sensor is liquid level, liquid temperature sensor；Metering ejector pump, it is integrated with metering
Pump, cleaner and measurement controller DCU, measurement controller DCU are used for the calculating of the emitted dose of aqueous solution of urea, measurement controller
DCU has OBD functions；Blender, it is arranged on blast pipe, for strengthening the spraying of aqueous solution of urea and mixing for waste gas
Close, the height of blender is higher than the entrance of catalytic muffler；And adding cyan nozzle, it is arranged on blender, and by adding
Blue pipeline is connected with metering ejector pump, and the aqueous solution of urea of metering is ejected into institute for the instruction according to measurement controller DCU
State in blast pipe.
Preferably, in above-mentioned technical proposal, diesel engine post-processing system also includes：Liquid electromagnetic valve is cooled down, it passes through cooling
Liquid pipeline is connected with the heat exchanger for adding blue tank and adding built in blue pump, for for system offer ice service.
Preferably, in above-mentioned technical proposal, measurement controller DCU is connected by CAN and Engine ECU communication, is led to
Cross and the running state data of engine and the signal of temperature sensor are calculated, so as to obtain the aqueous solution of urea of metering
Emitted dose.
Preferably, in above-mentioned technical proposal, the skin-material of catalytic muffler is stainless steel, and the bottom of stainless steel material is
Insulating materials, the average surface temperature of catalytic muffler is less than 200 DEG C in running.
Preferably, in above-mentioned technical proposal, the material for adding blue tank is plastics, adds being internally provided with for blue tank and adds blue coarse filtration
Device, for preventing bulky grain of the diameter more than 0.1mm from entering system.
Preferably, in above-mentioned technical proposal, add blue tank and be additionally provided with breather valve, for gas pressure inside and outside compensator, add
The bottom of blue tank is provided with raffinate and releases spiro pluging hole.
Preferably, in above-mentioned technical proposal, metering ejector pump also includes heater, water-soluble to prevent from adding the urea in blue tank
Liquid freezes.
Preferably, in above-mentioned technical proposal, coolant pipeline bands together with blue tube road, and outside is cased with being incubated
Pipe.
Preferably, in above-mentioned technical proposal, coolant pipeline uses the ethylene-propylene-diene monomer sebific duct that fiber is strengthened.
Compared with prior art, the present invention has the advantages that：
The SCR system of the present invention is simple in construction, and reasonable in design, overall space is small, is easier arrangement；Than traditional
The atomization of SCR aftertreatment system urea is abundant, and is easy to the emitted dose of accurate control urea, good reliability, and cost is relatively low.
Brief description of the drawings
Fig. 1 is the device composition schematic diagram according to the SCR system of the present invention；
Fig. 2 is the structured flowchart according to the SCR system of the present invention.
Main Reference Numerals explanation：
1- blast pipes, 2- catalytic mufflers, 3-NOxSensor, 4- temperature sensors, 5- add blue tank, 6- metering ejector pumps,
7- measurement controllers DCU, 8- add cyan nozzle, 9- blenders, 10- insulating tubes, 11- cooling liquid electromagnetic valves, 12- blue tubes road, 13-
Coolant pipeline, 14- liquid levels, temperature sensor, 15- electric signals.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment of the present invention is described in detail, it is to be understood that the guarantor of the present invention
Shield scope is not limited by embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members
Part or other parts.
As depicted in figs. 1 and 2, respectively according to the device composition schematic diagram of the SCR system of the specific embodiment of the invention
With the structured flowchart of SCR system.The diesel engine post-processing system of the present invention, it is applied to the diesel engine with turbocharger,
The SCR system includes：Blast pipe 1, catalytic muffler 2, NOxSensor 3, add blue tank 5, metering ejector pump 6, add cyan nozzle 8, be mixed
Clutch 9, cooling liquid electromagnetic valve 11 and corresponding pipeline (blue tube road 12, coolant pipeline 13) and wire harness.
Wherein, blast pipe 1 is connected with the engine of diesel engine, for receiving the waste gas from engine.Catalysis is eliminated the noise
Device 2 is connected with blast pipe 1, for reducing the nitrogen oxides in the waste gas and reducing the exhaust noise of the engine,
The catalytic muffler 2 includes SCR catalyst and engine exhaust muffler, and the catalytic muffler includes arrival end and outlet
End, the port of export are provided with a temperature sensor 4.The integral material of catalytic muffler 2 is stainless steel, built with SCR catalyst
Fuse and noise elimination pipeline, the bottom of top layer stainless steel material is insulating materials.It is it should be appreciated that of the prior art general
Insulating materials may be used as the insulating materials of the present invention.The table of the catalytic muffler in the process of running of catalytic muffler 2
Face mean temperature is less than 200 DEG C.The arrival end of catalytic muffler 2 is flange face interface, and the port of export is light pipe interface, of the invention
Catalytic muffler 2 can select tub catalytic muffler, and temperature sensor 4 is respectively arranged at the face of cylinder of arrival end and the port of export
On.It is to be understood, however, that the bright embodiment of this law is only exemplary and not restrictive.NOxSensor
3 are arranged at the port of export of catalytic muffler 2, for measuring the NO passed through in the reacted waste gas of catalytic mufflerxComposition it is dense
Degree, its concentration signal are used for closed-loop control and the OBD functions for adding blue injection.OBD(On-Board Diagnostics for
Vehicle Emission Control Systems) refer to emission control onboard diagnostic system, there is identification may lead for it
Cause to discharge the function of exceeded fault zone, and in a manner of failure code by the information storage in ECU memory,
Light malfunction indicator lamp (MIL) simultaneously.When failure causes to discharge obvious deterioration, activation engine subtracts moment of torsion function, the row of avoiding
Put further deterioration, remind driver to be repaired as early as possible.
Add blue tank 5 to be used to contain aqueous solution of urea, add blue tank and be provided with and add blue pump, sensor and heater, wherein the biography
Sensor is liquid level, liquid temperature sensor 14, adds the liquid level and temperature of aqueous solution of urea in blue tank 5 for sensing.Heater can
Ice is changed with heat using engine coolant.The material for adding blue tank 5 is plastics, adds being internally provided with for blue tank 5 and adds indigo plant slightly
Filter, for preventing bulky grain of the diameter more than 0.1mm from entering in system.Add blue tank 5 and be additionally provided with breather valve, for compensator
Inside and outside gas pressure.In addition, the bottom for adding blue tank 5, which is provided with raffinate, releases spiro pluging hole, for releasing liquid remaining in tank.
Metering ejector pump 6 is connected by blue tube road 12 with adding blue tank 5, and metering ejector pump 6 is integrated with measuring pump, cleaner
It is used for the work for controlling whole after-treatment system, including urea water with measurement controller DCU 7, the measurement controller DCU 7
The calculating of the emitted dose of solution, the model processing of sensor and the control of each actuator.Measurement controller DCU7 has OBD work(
Energy.Metering ejector pump 6 has two fluid connections and DCU electrical apparatus interfaces.Fluid connection is：From add blue tank 5 add blue entrance,
Add blue outlet to nozzle.DCU electrical apparatus interfaces include that storage battery source interface, ignition switch, J1939 be high and low and shield terminal.
Measurement controller DCU 7 has an OBD functions, during normal operation, opens the very brief sound sent when can hear pump operating after key
Sound, after engine starts, inside adds blue pump and started running, and pressure is set up in blue tube road 12, makes pipeline inner pressure all the time
5bar is maintained, is ready for injection aqueous solution of urea.When delivery temperature is higher than 200 DEG C, measurement controller DCU 7 is controlled
Add cyan nozzle 8 and spray aqueous solution of urea.After key-off is started, add blue pump by continuous firing 30 seconds, will be residual in pipeline
Liquid suck-back, which returns, adds blue tank 5, avoid because aqueous solution of urea crystallization and caused by pipeline blockage, so measurement controller DCU 7 total electricity
Source line can not be controlled by ignition switch.
Measurement controller DCU 7 is connected by CAN and Engine ECU communication, passes through the running status to engine
The electric signal 15 of data and temperature sensor 4 is calculated, and according to the various pulses demarcated in advance, is in time calculated and started
The emitted dose of aqueous solution of urea in the case of machine real work, so by CAN control metering ejector pump emitted dose, from
And cause the NO in waste gasxComposition is by precise restoration.
Blender 9 is arranged on the blast pipe 1, for the spraying for strengthening the aqueous solution of urea and the waste gas
Mixing, the height of blender 9 are higher than the entrance of the catalytic muffler 2.Add cyan nozzle 8 to be arranged on blender 9, and pass through
Blue tube road 12 is connected with metering ejector pump 6.Add cyan nozzle 8 and be also known as metering module, its effect is measurement controller DCU's 7
The aqueous solution of urea of metering is nebulized under instruction control and is ejected into blast pipe 1.The main body for adding cyan nozzle 8 is an electromagnetism
Valve, around surround and add blue runner, play cooling effect.In addition, liquid is entered back in the upper end for adding cyan nozzle 8 provided with aqueous solution of urea
Mouthful, side is provided with electrical apparatus interface, and periphery is provided with heat shield.
Cooling liquid electromagnetic valve 11 is connected by coolant pipeline 13 with the heat exchanger for adding blue tank 5 and adding built in blue pump, is used
Come for system offer ice service.Changing ice control is specially：When measurement controller DCU 7 by adding the liquid level of blue tank 5, temperature passes
When sensor 14 senses that the temperature of aqueous solution of urea is less than to a certain degree, judge that system freezes, be now powered and open coolant
Magnetic valve 11.Engine coolant after heating will flow to along coolant pipeline 13 to be added blue tank 5 and adds changing built in blue pump
Hot device, these local ice will melt rapidly.Because coolant pipeline 13 and blue tube road 12 band together, and outer cover
There is insulating tube 10, so the ice inside blue tube road 12 can also melt simultaneously.
Blue tube road 12 in the SCR system of the present invention must have enough intensity, will not be because of vacuum caused by suction
And it is crushed.Coolant pipeline 13 is to add blue tank 5 and blue tube road 12 with the coolant of engine to heat, so as to solve winter
Add blue easy icing, cold season adds the problem of blue temperature is low.The ethylene-propylene-diene monomer sebific duct that 13 preferred fiber of coolant pipeline is strengthened.
The description of the foregoing specific illustrative embodiment to the present invention is to illustrate and the purpose of illustration.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can be much changed
And change.The purpose of selecting and describing the exemplary embodiment is that explain that the certain principles of the present invention and its reality should
With so that those skilled in the art can realize and utilize the present invention a variety of exemplaries and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (9)
1. a kind of diesel engine post-processing system, it is applied to the diesel engine with turbocharger, it is characterised in that the diesel oil
Machine after-treatment system includes：
Blast pipe, it is connected with the engine of the diesel engine, for receiving the waste gas from the engine；
Catalytic muffler, it is connected with the blast pipe, for reducing described in nitrogen oxides and reduction in the waste gas
The exhaust noise of engine, the catalytic muffler include SCR catalyst and engine exhaust muffler, the catalytic muffler
Including arrival end and the port of export, the port of export is provided with temperature sensor；
NOxSensor, it is arranged at the port of export of the catalytic muffler, reacted useless by catalytic muffler for measuring
NO in gasxThe concentration of composition；
Add blue tank, for containing aqueous solution of urea, it is described add blue tank and be provided with add blue pump, sensor and heater, wherein described
Sensor is liquid level, liquid temperature sensor；
Metering ejector pump, the metering ejector pump are integrated with measuring pump, cleaner and measurement controller DCU, the measure control
Device DCU is used for the calculating of the emitted dose of the aqueous solution of urea, and the measurement controller DCU has OBD functions；
Blender, it is arranged on the blast pipe, for strengthening the spraying of the aqueous solution of urea and mixing for the waste gas
Close, the height of the blender is higher than the entrance of the catalytic muffler；And
Add cyan nozzle, it is arranged on the blender, and is connected by blue tube road with the metering ejector pump, for root
The aqueous solution of urea of metering is ejected into the blast pipe according to the instruction of the measurement controller DCU.
2. diesel engine post-processing system according to claim 1, it is characterised in that the diesel engine post-processing system also wraps
Include：Cool down liquid electromagnetic valve, it is connected by coolant pipeline with the heat exchanger for adding blue tank and adding built in blue pump, for for
System offerization ice service.
3. diesel engine post-processing system according to claim 1, it is characterised in that the measurement controller DCU passes through CAN
Bus connects with Engine ECU communication, passes through the running state data to the engine and the signal of the temperature sensor
Calculated, so as to obtain the emitted dose of the aqueous solution of urea of metering.
4. diesel engine post-processing system according to claim 1, it is characterised in that the skin-material of the catalytic muffler
For stainless steel, the bottom of the stainless steel material is insulating materials, and the surface of catalytic muffler described in running is average warm
Degree is less than 200 DEG C.
5. diesel engine post-processing system according to claim 1, it is characterised in that the material for adding blue tank is plastics,
It is described to add being internally provided with for blue tank and add blue coarse filter, for preventing bulky grain of the diameter more than 0.1mm from entering system.
6. diesel engine post-processing system according to claim 5, it is characterised in that described to add blue tank and be additionally provided with ventilation
Valve, for gas pressure inside and outside compensator, the bottom for adding blue tank is provided with raffinate and releases spiro pluging hole.
7. diesel engine post-processing system according to claim 1, it is characterised in that the metering ejector pump also includes heating
Device, to prevent the aqueous solution of urea added in blue tank from freezing.
8. diesel engine post-processing system according to claim 1, it is characterised in that the coolant pipeline adds indigo plant with described
Pipeline bands together, and outside is cased with insulating tube.
9. diesel engine post-processing system according to claim 8, it is characterised in that the coolant pipeline is added using fiber
Strong ethylene-propylene-diene monomer sebific duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710936550.8A CN107559080A (en) | 2017-10-10 | 2017-10-10 | Diesel engine post-processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710936550.8A CN107559080A (en) | 2017-10-10 | 2017-10-10 | Diesel engine post-processing system |
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| CN107559080A true CN107559080A (en) | 2018-01-09 |
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| CN201710936550.8A Pending CN107559080A (en) | 2017-10-10 | 2017-10-10 | Diesel engine post-processing system |
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Citations (7)
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|---|---|---|---|---|
| JP2008180202A (en) * | 2007-01-26 | 2008-08-07 | Nissan Diesel Motor Co Ltd | Exhaust emission control device |
| CN103790680A (en) * | 2014-02-21 | 2014-05-14 | 武汉添蓝发动机排放控制技术有限公司 | AdBlue filling system driven by compressed air |
| CN203742796U (en) * | 2014-02-19 | 2014-07-30 | 潍柴动力股份有限公司 | Diesel engine |
| US9062589B2 (en) * | 2013-01-17 | 2015-06-23 | Komatsu Ltd. | Reductant aqueous solution mixing device and exhaust aftertreatment device provided with the same |
| CN104912636A (en) * | 2015-05-22 | 2015-09-16 | 中国汽车技术研究中心 | Diesel engine aftertreatment SCR control device and method |
| CN105257377A (en) * | 2015-10-30 | 2016-01-20 | 安徽全柴动力股份有限公司 | SCR after-treatment packaging structure for diesel engine |
| CN207499950U (en) * | 2017-10-10 | 2018-06-15 | 广西玉柴机器股份有限公司 | Diesel engine post-processing system |
-
2017
- 2017-10-10 CN CN201710936550.8A patent/CN107559080A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008180202A (en) * | 2007-01-26 | 2008-08-07 | Nissan Diesel Motor Co Ltd | Exhaust emission control device |
| US9062589B2 (en) * | 2013-01-17 | 2015-06-23 | Komatsu Ltd. | Reductant aqueous solution mixing device and exhaust aftertreatment device provided with the same |
| CN203742796U (en) * | 2014-02-19 | 2014-07-30 | 潍柴动力股份有限公司 | Diesel engine |
| CN103790680A (en) * | 2014-02-21 | 2014-05-14 | 武汉添蓝发动机排放控制技术有限公司 | AdBlue filling system driven by compressed air |
| CN104912636A (en) * | 2015-05-22 | 2015-09-16 | 中国汽车技术研究中心 | Diesel engine aftertreatment SCR control device and method |
| CN105257377A (en) * | 2015-10-30 | 2016-01-20 | 安徽全柴动力股份有限公司 | SCR after-treatment packaging structure for diesel engine |
| CN207499950U (en) * | 2017-10-10 | 2018-06-15 | 广西玉柴机器股份有限公司 | Diesel engine post-processing system |
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