CN108458876A - SCR post-processes urea crystals off-line simulation pilot system - Google Patents
SCR post-processes urea crystals off-line simulation pilot system Download PDFInfo
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- CN108458876A CN108458876A CN201711271000.5A CN201711271000A CN108458876A CN 108458876 A CN108458876 A CN 108458876A CN 201711271000 A CN201711271000 A CN 201711271000A CN 108458876 A CN108458876 A CN 108458876A
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- scr
- control unit
- scr catalytic
- electronic control
- burner
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention provides a kind of SCR to post-process urea crystals off-line simulation pilot system,Including electronic control unit and pass through the sequentially connected air filter of pipeline,Air blower,Muffler,Burner,Xi Yan mechanisms,SCR catalytic mufflers,Air blower and the burner are electrically connected with electronic control unit respectively,The pipeline that muffler is connect with burner is equipped with first pressure sensor,Flow velocity sensor and the first control valve,The pipeline that Xi Yan mechanisms are connect with SCR catalytic mufflers is equipped with the second control valve and temperature sensor,The intake line of the SCR catalytic mufflers is equipped with second pressure sensor,The output pipe of the SCR catalytic mufflers is equipped with third pressure sensor,It is additionally provided with high-temperature probe on the SCR catalytic mufflers,The high-temperature probe is electrically connected with the electronic control unit.The present invention simulation of engine steady operation can be realized without engine, and can realize the visualization of urea crystals process using testing offline.
Description
Technical field
The present invention relates to engine SCR post-processing technology fields, offline more particularly to a kind of SCR post-processings urea crystals
Simulation experiment system.
Background technology
As the rapid development of China's ic engine industry and state compulsion emission regulation are implemented, the discharge and crystallization control of diesel engine
System is increasingly taken seriously.Oxynitrides is one of diesel emissions major pollutants, and post-processing SCR technology is as effective
Emission control systems, can effectively reduce oxynitrides, but urea crystals present in SCR technology are diesel engine after treatment
One of system principal risk point.
Currently, key factor needed to be considered when the urea crystals in SCR catalytic mufflers are urea nozzle designs, still
Since the test crystallized at present all uses engine pedestal to carry out, situation is crystallized for SCR catalytic mufflers used in different type of machines,
Need different configuration of engine, test period length and of high cost.
Invention content
The purpose of the present invention is at least solving one of drawbacks described above and deficiency, which is achieved through the following technical solutions
's.
The present invention provides a kind of SCR post-process urea crystals off-line simulation pilot system, including electronic control unit with
And pass through the sequentially connected air filter of pipeline, air blower, muffler, burner, Xi Yan mechanisms, SCR catalytic mufflers, the drum
Wind turbine and the burner are electrically connected with the electronic control unit respectively, the pipeline that the muffler is connect with the burner
It is equipped with first pressure sensor, flow velocity sensor and the first control valve, the first pressure sensor, flow velocity
Sensor and the first control valve are electrically connected with the electronic control unit respectively, and the Xi Yan mechanisms disappear with SCR catalysis
The pipeline of sound device connection is equipped with the second control valve and temperature sensor, second control valve and temperature sensor difference
It is electrically connected with the electronic control unit, the intake line of the SCR catalytic mufflers is equipped with second pressure sensor, described
The output pipe of SCR catalytic mufflers is equipped with third pressure sensor, and high temperature spy is additionally provided on the SCR catalytic mufflers
Head, the high-temperature probe are electrically connected with the electronic control unit.
Further, further include the bypass line being arranged between the muffler and the SCR catalytic mufflers, it is described
Electronic control unit can control second control valve and pass through the extra exhaust gas not entered in the SCR catalytic mufflers
The bypass line is transferred to the upstream of first control valve.
Further, further include the exhaust processor being arranged in the downstream of the SCR catalytic mufflers, the exhaust-gas treatment
Device is connect by discharge duct with the output end of the SCR catalytic mufflers, is handled for that will pass through the SCR catalytic mufflers
Exhaust gas afterwards is recycled.
Further, the burner can adjust the injection burning by the feedback information of the electronic control unit
The fuel injection amount of device and the gas flow for entering the burner.
Further, the electronic control unit can be by calculating the second pressure sensor and the third pressure
Pressure difference between sensor obtains the back pressure value of the SCR catalytic mufflers.
Advantages of the present invention is as follows：
(1) present invention is not necessarily to engine using being tested offline, can be according to universal characteristic curve of engine parameter regulation
Systematic parameter realizes the simulation of engine steady operation.
(2) present invention accurately controls the flow and temperature of exhaust gas by controller, ensures exhaust gas conditions and engine exhaust
It is consistent, the poor influence to exhaust gas of engine condition consistency is avoided, ensures test result accuracy.
(3) present invention increases high-temperature probe in SCR catalytic mufflers position, can visually observe SCR catalysis and eliminate the noise
Urea is atomized generation position and the evolution of mixed process, urea crystals inside device.
(4) SCR of the invention crystallization testing experiment is not take up rack resource, improves rack utilization rate, facilitates analytical judgment
The Crack cause of crystallization.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field
Technical staff will become clear.Attached drawing only for the purpose of illustrating preferred embodiments, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.
Fig. 1 is the schematic diagram that SCR provided in an embodiment of the present invention post-processes urea crystals off-line simulation pilot system.
Reference numeral is as follows in figure：
1- air filter 2- air blowers
3- muffler 4- burners
5- Xi Yan mechanisms 6-SCR catalytic mufflers
61- high-temperature probes
7- electronic control unit 81- first pressure sensors
82- second pressure sensor 83- third pressure sensors
9- flow velocity sensor the first control valves of 10-
11- the second control valve 12- temperature sensors
13- exhaust processor 14- bypass lines
Specific implementation mode
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to be best understood from the disclosure on the contrary, providing these embodiments, and can be by this public affairs
The range opened completely is communicated to those skilled in the art.
Fig. 1 shows the SCR post-processing urea of the post-processing for engine provided according to the embodiment of the present invention
Crystallize the schematic diagram of off-line simulation pilot system.As shown in Figure 1, this system include electronic control unit 7 and by pipeline according to
The air filter 1 of secondary connection, air blower 2, muffler 3, burner 4, Xi Yan mechanisms 5, SCR catalytic mufflers 6, wherein：
The output end of air filter 1 is with the input terminal of air blower 2 by piping connection, and for providing clean air, acquisition can
The exhaust gas parameters leaned on.
The output end of air blower 2 is connect by pipeline with the output end of muffler 3, air blower 2 and 7 electricity of electronic control unit
Connection, electronic control unit 7 can be adjusted to adjusting the gas flow in air blower 2.Muffler 3 can be to passing through air blast
Gas after the pressurization of machine 2 accelerates carries out noise reduction process, improves erasure effect.
The pipeline that muffler 3 is connect with burner 4 be equipped with first pressure sensor 81, flow velocity sensor 9 and
First control valve 10, first pressure sensor 81, flow velocity sensor 9 and the first control valve 10 are single with electronic control respectively
Member 7 is electrically connected.
First pressure sensor 81 can monitor the pressure of the entrance pipe of burner 4 and pressure information is transmitted to electronics
Control unit 7.
Flow velocity sensor 9 can by the entrance pipe of burner 4 gas flow and flow rate information be transmitted to electricity
Sub-control unit 7.
Electronic control unit 7 can control the aperture of the first control valve 10, and to enter burner 4 gas flow into
Row control.
Burner 4 is electrically connected with electronic control unit 7, and burner 4 is equipped with igniter, and injection is burnt using igniter
The fuel of device 4 is lighted with after the gas mixing of muffler 3.Burner 4 can be according to letters such as the flows of electronic control unit 7
Breath feedback adjusts the emitted dose of fuel and controls the gas flow into burner 4.The fuel for injecting burner 4 is fuel oil
Or combustion gas.
Xi Yan mechanisms 5 are arranged the flame in the downstream of burner 4, burner 4 and enter after Xi Yan mechanisms 5 are extinguished and can give birth to
At the exhaust gas with motor exhaust match parameters.
In addition, being additionally provided with bypass conduit 14 between muffler 3 and SCR catalytic mufflers 6, bypass line 14 is flowed through
Exhaust gas is extra exhaust gas, and the second control valve 11 can control in waste gas flow direction SCR catalytic mufflers 6 and control is extra
Exhaust gas returns to the upstream of the first control valve 10 via bypass line 14.
The output pipe of Xi Yan mechanisms 5 is equipped with temperature sensor 12, and temperature sensor 12 is electrically connected with electronic control unit 7
It connects, electronic control unit 7 can be adjusted the exhaust gas temperature that temperature sensor 12 monitors by PID/feedback, adjust the second control
The aperture of valve 11 processed is adjusted into trip temperature, is controlled entering the temperature of exhaust gas of SCR catalytic mufflers 6.
The intake line of SCR catalytic mufflers 6 is equipped with second pressure sensor 82, and output pipe is equipped with third pressure
Force snesor 83, the pressure front and back to SCR reactions is monitored, and pressure information is transmitted to electronic control unit 7.
Electronic control unit 7 by calculating the pressure difference between 6 output pipe of SCR catalytic mufflers and intake line, from
And the back pressure value of SCR catalytic mufflers 6 is obtained, judge whether cerium sulphate crystal condition meets the requirements.
SCR catalytic mufflers 6 are equipped with high-temperature probe 61, and high-temperature probe 61 is electrically connected with electronic control unit 7, passes through height
Temperature probe 61 can directly observe the urea crystals change procedure in urea nozzle and SCR catalytic mufflers 6.Pass through high-temperature probe
61 can also observe different exhaust gas flows under the conditions of atomization of the urea with exhaust gas in mixer position react.High-temperature probe 61 uses
Resistant detector, and in the top of 6 side wall of SCR catalytic mufflers, observation SCR catalytic mufflers 6 that can be comprehensive
Crystallization situation.
In addition, being equipped with exhaust processor 13 in the downstream of SCR catalytic mufflers 6, exhaust processor 13 passes through discharge duct
It is connect with the output end of SCR catalytic mufflers 6, treated for will pass through SCR catalytic mufflers 6, and exhaust gas carries out at recycling
Reason, prevents from polluting.
Working principle of the invention is as follows：
When this system works, according to parameters such as Engine Universal Characteristics exhaust gas flow, temperature, pass through electronic control unit 7
Adjust the gas flow into air blower 2.
Gas enters by air filter 1, the flow of the aperture regulation gas by adjusting the first control valve 10, then gas
Into air blower 2, gas enters muffler 3 via the output pipe of air blower 2 after the pressurization of air blower 2 and acceleration, right
Gas after above-mentioned pressurization accelerates carries out noise reduction.9 Real-time Feedback flow of flow velocity sensor, flow velocity signal to electronics in pipeline
Control unit 7, electronic control unit 7 adjust the by ratio, integral, differential control (follow-up abbreviation PID adjust) feedback regulation
One control valve 10 carries out flow, flow control to gas.Meanwhile burner 4 passes through the feedback letters such as the flow of electronic control unit 7
Breath adjusts the emitted dose of fuel and enters the gas flow of burner 4, the fuel of gas and injection after above-mentioned pressurization is accelerated
It is mixed to form mixed gas.Burner 4 controls igniter and lights the mixed gas, and flame, which enters after Xi Yan mechanisms 5 are extinguished, to be generated
Exhaust gas, the exhaust gas temperature that the monitoring of temperature sensor 12 being arranged after Xi Yan mechanisms 5 generates, and adjusted by PID/feedback, it adjusts
The opening and closing of second control valve 11 is adjusted into trip temperature, and the exhaust gas into SCR catalytic mufflers 6 is made to reach required temperature and stream
Amount, final exhaust gas enter SCR catalytic mufflers 6 and carry out urea crystals test.
It is tested by the second pressure sensor 82 and third pressure sensor 83 that are arranged before and after SCR catalytic mufflers 6
Pressure difference before and after SCR catalytic mufflers 6, obtains back pressure value, judges whether cerium sulphate crystal condition meets the requirements.Pass through high-temperature probe 61
The urea crystals variation in entire test process in SCR catalytic mufflers 6 can be monitored.
The present invention uses the tail gas of exhaust gas generating means simulated engine, simulates the work feelings of engine under limit
Condition, Control experiment condition, solve SCR catalytic mufflers crystallization test must be tested in engine operation process ask
Topic reduces nozzle matches SCR catalytic mufflers and carries out the resource that crystallization test is used.In addition, can using high-temperature probe
Depending on the crystallization situation of the observation urea nozzle and SCR catalytic mufflers of change.
It should be pointed out that in the description of the present invention, term " first ", " second ", " third " are only used for a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (5)
1. a kind of SCR post-processes urea crystals off-line simulation pilot system, which is characterized in that including electronic control unit and lead to
Cross the sequentially connected air filter of pipeline, air blower, muffler, burner, Xi Yan mechanisms, SCR catalytic mufflers, the air blower
It is electrically connected with the electronic control unit with the burner, is set on the pipeline that the muffler is connect with the burner respectively
There are first pressure sensor, flow velocity sensor and the first control valve, the first pressure sensor, flow velocity sensing
Device and the first control valve are electrically connected with the electronic control unit respectively, the Xi Yan mechanisms and the SCR catalytic mufflers
The pipeline of connection is equipped with the second control valve and temperature sensor, second control valve and temperature sensor respectively with institute
Electronic control unit electrical connection is stated, the intake line of the SCR catalytic mufflers is equipped with second pressure sensor, the SCR
The output pipe of catalytic muffler is equipped with third pressure sensor, is additionally provided with high-temperature probe on the SCR catalytic mufflers, institute
High-temperature probe is stated to be electrically connected with the electronic control unit.
2. SCR according to claim 1 post-processes urea crystals off-line simulation pilot system, which is characterized in that further include
The bypass line being arranged between the muffler and the SCR catalytic mufflers, the electronic control unit can control institute
State the second control valve the extra exhaust gas not entered in the SCR catalytic mufflers is transferred to by the bypass line it is described
The upstream of first control valve.
3. SCR according to claim 1 post-processes urea crystals off-line simulation pilot system, which is characterized in that further include
Exhaust processor in the downstream of the SCR catalytic mufflers is set, and the exhaust processor passes through discharge duct and the SCR
The output end of catalytic muffler connects, and treated for will pass through the SCR catalytic mufflers, and exhaust gas is recycled.
4. SCR post-processes urea crystals off-line simulation pilot system according to any one of claims 1 to 3, special
Sign is that the burner can adjust the fuel spray for injecting the burner by the feedback information of the electronic control unit
The amount of penetrating and the gas flow for entering the burner.
5. SCR post-processes urea crystals off-line simulation pilot system according to any one of claims 1 to 3, special
Sign is that the electronic control unit can be by calculating between the second pressure sensor and the third pressure sensor
Pressure difference obtain the back pressure values of the SCR catalytic mufflers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711271000.5A CN108458876A (en) | 2017-12-05 | 2017-12-05 | SCR post-processes urea crystals off-line simulation pilot system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711271000.5A CN108458876A (en) | 2017-12-05 | 2017-12-05 | SCR post-processes urea crystals off-line simulation pilot system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108458876A true CN108458876A (en) | 2018-08-28 |
Family
ID=63221099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711271000.5A Pending CN108458876A (en) | 2017-12-05 | 2017-12-05 | SCR post-processes urea crystals off-line simulation pilot system |
Country Status (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110552770A (en) * | 2019-09-18 | 2019-12-10 | 潍柴动力股份有限公司 | Mixer crystallization detection method and system |
| CN110848003A (en) * | 2019-11-15 | 2020-02-28 | 中国重汽集团济南动力有限公司 | Air-assisted SCR urea consumption low-fault simulation device and method |
| CN113530655A (en) * | 2021-08-11 | 2021-10-22 | 一汽解放汽车有限公司 | Urea crystal detection device, urea crystal treatment method, urea crystal treatment device, urea crystal treatment equipment and storage medium |
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Application publication date: 20180828 |