CN207499950U - Diesel engine post-processing system - Google Patents
Diesel engine post-processing system Download PDFInfo
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- CN207499950U CN207499950U CN201721298511.1U CN201721298511U CN207499950U CN 207499950 U CN207499950 U CN 207499950U CN 201721298511 U CN201721298511 U CN 201721298511U CN 207499950 U CN207499950 U CN 207499950U
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Abstract
The utility model discloses a kind of diesel engine post-processing system, including：Exhaust pipe, catalytic muffler, NOxSensor adds blue tank, metering ejector pump, mixer and adds cyan nozzle.Wherein, catalytic muffler is connected with exhaust pipe, for restoring the nitrogen oxides in exhaust gas and reducing the exhaust noise of engine；Add blue tank and be equipped 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 the function of OBD；Mixer is arranged on exhaust pipe；Add cyan nozzle to be arranged on mixer, and pass through blue tube road and connect with metering ejector pump, the aqueous solution of urea of metering is ejected into exhaust pipe for the instruction according to measurement controller DCU.The diesel engine post-processing system reasonable design, simple in structure, integrated level is high, urea jet atomization efficiency is higher, cost is relatively low.
Description
Technical field
The utility model is related 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),
The english abbreviation of Reduction (reduction)) operation principle be to spray reductant into exhaust pipe, the oxynitrides in exhaust exists
It is reacted under the action of catalyst converter with reducing agent and is 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 generates nitrogen and water：
NO+NO2+2NH3=2N2+3H2O
4NO+O2+4NH3=4N2+6H2O
2NO2+O2+4NH3=3N2+6H2O
The leakage of engine ammonia during entire service life in order to prevent is equipped with ammonia catalyst converter 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 known as adding indigo plant.
The SCR system used in the prior art generally includes urea injection system, preceding temperature sensor, rear temperature sensing
Device, NOx sensor, differential pressure pickup, mixer and exhaust pipe.Therefore, SCR system of the prior art is spent in the presence of length
Length is not easy arrangement, and 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, of high cost.
The information for being disclosed in the background technology part is merely intended to increase the understanding to the general background of the utility model, and
It is not construed as recognizing or implies that information composition has been existing well known to persons skilled in the art in any form
Technology.
Utility model content
The purpose of this utility model is to provide a kind of diesel engine post-processing systems, long so as to solve system in the prior art
Spend the problem of long, integrated level is low and the accuracy of spray of reducing agent is poor.
To achieve the above object, the utility model provides a kind of diesel engine post-processing system, is applied to turbine
The diesel engine of booster, the diesel engine post-processing system include：Exhaust pipe is connected with the engine of diesel engine, for connecing
Receive the exhaust gas from engine；Catalytic muffler is connected with exhaust pipe, for restoring the nitrogen oxides in exhaust gas and drop
The exhaust noise of low engine, catalytic muffler include SCR catalyst and engine exhaust muffler, catalytic muffler include into
Mouth end and the port of export, the port of export are provided with temperature sensor；NOxSensor is set to the port of export of catalytic muffler, is used for
Measure the NO in the exhaust gas after catalytic muffler reactsxThe concentration of ingredient；Add blue tank, for containing aqueous solution of urea, add
Blue tank, which is equipped with, adds blue pump, sensor and heater, and wherein sensor is liquid level, liquid temperature sensor；Metering ejector pump is integrated with
Metering pump, filter and measurement controller DCU, measurement controller DCU is for the calculating of the emitted dose of aqueous solution of urea, metering control
Device DCU processed has the function of OBD；Mixer is arranged on exhaust pipe, for strengthening the spraying of aqueous solution of urea and exhaust gas
Mixing, the height of mixer are higher than the entrance of catalytic muffler；And add cyan nozzle, it is arranged on mixer, and pass through
Blue tube road is connect with metering ejector pump, is ejected into the aqueous solution of urea of metering for the instruction according to measurement controller DCU
In the exhaust pipe.
Preferably, in above-mentioned technical proposal, diesel engine post-processing system further includes：Liquid electromagnetic valve is cooled down, passes through cooling
Liquid pipeline is connected with adding blue tank and adding the built-in heat exchanger of blue pump, for for system offer ice service.
Preferably, in above-mentioned technical proposal, measurement controller DCU is connected by CAN bus and Engine ECU communication, is led to
It crosses and the running state data of engine and the signal of temperature sensor is calculated, so as to obtain the aqueous solution of urea of metering
Emitted dose.
Preferably, in above-mentioned technical proposal, add being internally provided with for blue tank and add blue coarse filter, for diameter to be prevented to be more than
The bulky grain of 0.1mm enters 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 further includes heater, water-soluble to prevent from adding the urea in blue tank
Liquid freezes.
Preferably, in above-mentioned technical proposal, coolant pipeline is banded together with blue tube road, and outside is cased with keeping the temperature
Pipe.
Compared with prior art, the utility model has the advantages that：
The SCR system of the utility model is simple in structure, reasonable design, and overall space is small, is easier arrangement；Than passing
The SCR aftertreatment system urea atomization of system is abundant, and the emitted dose convenient for accurately controlling urea, good reliability, cost are relatively low.
Description of the drawings
Fig. 1 is the device composition schematic diagram of SCR system according to the present utility model；
Fig. 2 is the structure diagram of SCR system according to the present utility model.
Main appended drawing reference explanation：
1- exhaust 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- mixers, 10- insulating tubes, 11- cooling liquid electromagnetic valves, 12- blue tubes road, 13-
Coolant pipeline, 14- liquid levels, temperature sensor, 15- electric signals.
Specific embodiment
Below in conjunction with the accompanying drawings, specific embodiment of the present utility model is described in detail, it is to be understood that this practicality
Novel protection domain is not restricted by specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " comprising " or its change
It changes such as "comprising" or " including " etc. and will be understood to comprise stated element or component, and do not exclude other members
Part or other component parts.
As depicted in figs. 1 and 2, respectively shown according to the device of the SCR system of specific embodiment of the present invention composition
It is intended to the structure diagram with SCR system.The diesel engine post-processing system of the utility model is applied to turbocharger
Diesel engine, the SCR system include：Exhaust pipe 1, catalytic muffler 2, NOxSensor 3 adds blue tank 5, metering ejector pump 6, adds indigo plant
Nozzle 8, mixer 9, cooling liquid electromagnetic valve 11 and corresponding pipeline (blue tube road 12, coolant pipeline 13) and harness.
Wherein, exhaust pipe 1 is connected with the engine of diesel engine, for receiving the exhaust gas from engine.Catalysis is eliminated the noise
Device 2 is connected with exhaust pipe 1, for restoring the nitrogen oxides in the exhaust 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, there are one temperature sensors 4 for port of export setting.The integral material of catalytic muffler 2 is stainless steel, interior that SCR catalyst is housed
Fuse and noise elimination pipeline, the lower part of surface layer stainless steel material is insulating materials.It is it should be understood that of the prior art general
Insulating materials may be used as the insulating materials of the utility model.The catalytic muffler in the process of running of catalytic muffler 2
Average surface temperature be less than 200 DEG C.The arrival end of catalytic muffler 2 be flange face interface, the port of export be light pipe interface, this reality
Barrel type catalytic muffler can be selected with novel catalytic muffler 2, temperature sensor 4 is respectively arranged at arrival end and the port of export
Cylindrical surface on.It is to be understood, however, that the bright specific embodiment of this law is only exemplary and not restrictive.
NOxSensor 3 is set to the port of export of catalytic muffler 2, for measuring the NO in the exhaust gas after catalytic muffler reactsx
The concentration of ingredient, concentration signal are used to add the closed-loop control of blue injection and OBD functions.OBD(On-Board Diagnostics
For Vehicle Emission Control Systems) refer to emission control onboard diagnostic system, it has identification can
The function of exceeded fault zone can be caused to discharge, and the information is stored in electronic control unit memory in a manner of failure code
It is interior, while light malfunction indicator lamp (MIL).When failure causes to discharge apparent deterioration, activation engine subtracts torque function, avoids
Discharge further deteriorates, driver is reminded to repair as early as possible.
Add blue tank 5 for containing aqueous solution of urea, add blue tank and be equipped with and add blue pump, sensor and heater, the wherein biography
Sensor is liquid level, liquid temperature sensor 14, for sensing the liquid level and temperature that add aqueous solution of urea in blue tank 5.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 connect by blue tube road 12 with adding blue tank 5, and metering ejector pump 6 is integrated with metering pump, filter
With measurement controller DCU 7, the measurement controller DCU 7 is used to control the work of entire after-treatment system, including urea water
The calculating of the emitted dose of solution, the model processing of sensor and the control of each actuator.Measurement controller DCU 7 has OBD work(
Energy.There are two fluid connection and DCU electrical apparatus interfaces for the tool of metering ejector pump 6.Fluid connection is：From add blue tank 5 add blue entrance,
Add blue outlet to nozzle.DCU electrical apparatus interfaces include that battery feed interface, ignition switch, J1939 be high and low and shield terminal.
Measurement controller DCU 7 has the function of OBD, during normal operation, opens the very brief sound sent out when can hear pump operating after key
Sound, after engine start, inside adds blue pump and starts running, and sets up pressure in blue tube road 12, makes pipeline inner pressure always
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, it will be residual in pipeline
Liquid suck-back, which returns, adds blue tank 5, avoids causing pipeline blockage due to aqueous solution of urea crystallizes, so total electricity of measurement controller DCU 7
Source line cannot be controlled by ignition switch.
Measurement controller DCU 7 is connected by CAN bus and Engine ECU communication, passes through the operating 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 bus control metering ejector pump emitted dose, from
And cause the NO in exhaust gasxIngredient is by precise restoration.
Mixer 9 is arranged on the exhaust pipe 1, for strengthening the spraying of the aqueous solution of urea and the exhaust gas
Mixing, the height of mixer 9 are higher than the entrance of the catalytic muffler 2.Add cyan nozzle 8 to be arranged on mixer 9, and pass through
Blue tube road 12 is connect with metering ejector pump 6.Add cyan nozzle 8 and be also known as metering module, effect is measurement controller DCU's 7
The aqueous solution of urea of metering is nebulized under instruction control and is ejected into exhaust pipe 1.The main body for adding cyan nozzle 8 is an electromagnetism
Valve around surrounds and adds blue runner, plays cooling effect.In addition, add cyan nozzle 8 upper end be equipped with aqueous solution of urea into return liquid
Mouthful, side is equipped with electrical apparatus interface, and periphery is equipped with heat shield.
Cooling liquid electromagnetic valve 11 is connected by coolant pipeline 13 with adding blue tank 5 and adding the built-in heat exchanger of 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 powered open coolant at this time
Solenoid valve 11.Engine coolant after heating, which will flow to add blue tank 5 and add indigo plant along coolant pipeline 13, pumps built-in changing
Hot device, the ice in these places will melt rapidly.Since 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.
The description of the aforementioned specific exemplary embodiment to the utility model is in order to illustrate and illustration purpose.These
Description is not wishing to the utility model is defined to disclosed precise forms, and it will be apparent that according to the above instruction, can carry out
Many change and variations.The purpose of selecting and describing the exemplary embodiment is that explain the specific principle of the utility model
And its practical application, so that those skilled in the art can realize and utilize a variety of different examples of the utility model
Property embodiment and various chooses and changes.The scope of the utility model is intended to by claims and its waits similar shapes
Formula is limited.
Claims (7)
1. a kind of diesel engine post-processing system is applied to the diesel engine with turbocharger, which is characterized in that the diesel oil
Machine after-treatment system includes：
Exhaust pipe is connected with the engine of the diesel engine, for receiving the exhaust gas from the engine；
Catalytic muffler is connected with the exhaust pipe, for restoring described in nitrogen oxides and reduction in the exhaust 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 is set to the port of export of the catalytic muffler, useless after catalytic muffler reacts for measuring
NO in gasxThe concentration of ingredient；
Add blue tank, for containing aqueous solution of urea, it is described add blue tank and be equipped 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 metering pump, filter 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 the function of OBD；
Mixer is arranged on the exhaust pipe, for strengthening the spraying of the aqueous solution of urea and mixing for the exhaust gas
It closes, the height of the mixer is higher than the entrance of the catalytic muffler；And
Add cyan nozzle, be arranged on the mixer, and pass through blue tube road and connect with the metering ejector pump, for root
The aqueous solution of urea of metering is ejected into the exhaust pipe according to the instruction of the measurement controller DCU.
2. diesel engine post-processing system according to claim 1, which is characterized in that the diesel engine post-processing system also wraps
It includes：Cool down liquid electromagnetic valve, be 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, which is characterized in that the measurement controller DCU passes through CAN
Bus is connected with Engine ECU communication, passes through the running state data to the engine and the signal of the temperature sensor
It is 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, which is characterized in that 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.
5. diesel engine post-processing system according to claim 1, which is characterized 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.
6. diesel engine post-processing system according to claim 1, which is characterized in that the metering ejector pump further includes heating
Device, to prevent the aqueous solution of urea added in blue tank from freezing.
7. diesel engine post-processing system according to claim 2, which is characterized in that the coolant pipeline adds indigo plant with described
Pipeline bands together, and outside is cased with insulating tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721298511.1U CN207499950U (en) | 2017-10-10 | 2017-10-10 | Diesel engine post-processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721298511.1U CN207499950U (en) | 2017-10-10 | 2017-10-10 | Diesel engine post-processing system |
Publications (1)
| Publication Number | Publication Date |
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| CN207499950U true CN207499950U (en) | 2018-06-15 |
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ID=62500448
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721298511.1U Active CN207499950U (en) | 2017-10-10 | 2017-10-10 | Diesel engine post-processing system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107559080A (en) * | 2017-10-10 | 2018-01-09 | 广西玉柴机器股份有限公司 | Diesel engine post-processing system |
| CN108843429A (en) * | 2018-06-28 | 2018-11-20 | 福州海蓝环保科技有限公司 | A kind of urea for vehicle tank |
| CN109973177A (en) * | 2019-03-29 | 2019-07-05 | 河南科技大学 | A kind of diesel engine after treatment device |
-
2017
- 2017-10-10 CN CN201721298511.1U patent/CN207499950U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107559080A (en) * | 2017-10-10 | 2018-01-09 | 广西玉柴机器股份有限公司 | Diesel engine post-processing system |
| CN108843429A (en) * | 2018-06-28 | 2018-11-20 | 福州海蓝环保科技有限公司 | A kind of urea for vehicle tank |
| CN109973177A (en) * | 2019-03-29 | 2019-07-05 | 河南科技大学 | A kind of diesel engine after treatment device |
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