CN209637857U - Extraction flow real-time measurement system for diesel engine SCR apparatus - Google Patents
Extraction flow real-time measurement system for diesel engine SCR apparatus Download PDFInfo
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- CN209637857U CN209637857U CN201920070186.6U CN201920070186U CN209637857U CN 209637857 U CN209637857 U CN 209637857U CN 201920070186 U CN201920070186 U CN 201920070186U CN 209637857 U CN209637857 U CN 209637857U
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- air inlet
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- inlet pipe
- diesel engine
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
Abstract
The utility model relates to diesel exhaust gas to monitor system, the extraction flow real-time measurement system for diesel engine SCR apparatus.The extraction flow real-time measurement system for diesel engine SCR apparatus includes: selective catalytic reduction device SCR, air inlet and exhaust outlet are distinguished in the both ends of the selective catalytic reduction device SCR, are connected with air inlet pipe and exhaust pipe respectively on the air inlet and exhaust outlet；First temperature sensor, first temperature sensor is mounted in air inlet pipe, for acquiring the temperature information in the air inlet pipe；First pressure sensor, the first pressure sensor are mounted in air inlet pipe, for acquiring the pressure information in the air inlet pipe；Second temperature sensor, the second temperature sensor are mounted in air inlet pipe, for acquiring the temperature information in the exhaust pipe；Second pressure sensor, the second pressure sensor is mounted in air inlet pipe, for acquiring the pressure information in the exhaust pipe.
Description
Technical field
The utility model relates to diesel exhaust gas to monitor system, the extraction flow real-time measurement for diesel engine SCR apparatus
System.
Background technique
Selective catalytic reduction device (Selective Catalytic Reduction, SCR) is answered on diesel engines at present
With widest denitrification apparatus.Urea (CO (NH2) 2) solution is sprayed into generally into exhaust, urea pyrolysis is hydrolyzed to ammonia (NH3)
As reducing agent, under the action of catalyst, nitrogen oxides (NOx) conversion in oxygen rich exhaust is selectively reduced to nontoxic nothing
Harmful nitrogen (N2) and water (H2O), to realize diesel exhaust gas denitration.
The main task of SCR control system is to realize the dynamic control of urea liquid the amount of injection under different operating conditions.Urea spray
The amount of penetrating is excessively few then to make NOx conversion efficiency lower, and excessively it will cause the leakages of ammonia for injection, generate to human respiratory rotten
Erosion and stimulation.Urea injecting quantity is determined according to extraction flow, NOx concentration and denitration efficiency.Therefore extraction flow is SCR
An important input parameter in control, the accuracy of data directly affects urea injecting quantity, to influence denitration performance.
Currently, the measurement method of extraction flow mainly include the following types:
(1) exhaust mass flow is equal to air-mass flow plus fuel mass flow.Its fundamental formular is:
mExhaust=mAir inlet+mFuel oil
Under normal circumstances, from the mass flow of engine discharge equal to the mass flow into human hair motivation, but if
There is fraction to shunt away before exhaust system through engine accessory channel in air inlet, then above-mentioned relation is just no longer applicable in.
(2) extraction flow is measured with flow nozzle, pitot tube flowmeter etc., since flowing generates differential pressure, matches resultant pressure, temperature
Spending sensor can measure the flow of various fluids in pipeline.The disadvantage is that needing to carry out additional transformation to exhaust system；And the meter
Molecular weight has been used in calculation, is difficult accurately to know the molecule of exhaust under conditions of no additional survey instrument and analysis method
Amount, there are errors for obtained exhaust mass flow.
Therefore a kind of accurate, real-time SCR extraction flow measurement method is found, for realizing SCR urea injecting quantity
Dynamic controls, and is of great significance to improve denitration efficiency.
Summary of the invention
In order to solve the deficiencies in the prior art, the utility model provides a kind of row for diesel engine SCR apparatus
Throughput real-time measurement system, the utility model can not need diesel engine intake flow and distributive value information, not need yet
Diesel engine exhaust system is carried out under the premise of being excessively transformed, the extraction flow for flowing through SCR device in real time, reliably survey
Amount.
According to technical solution provided by the utility model, a kind of extraction flow real-time measurement for diesel engine SCR apparatus
System, which is characterized in that the extraction flow real-time measurement system for diesel engine SCR apparatus includes:
The both ends difference air inlet of selective catalytic reduction device SCR, the selective catalytic reduction device SCR and exhaust
Mouthful, it is connected with air inlet pipe and exhaust pipe respectively on the air inlet and exhaust outlet；
First temperature sensor, first temperature sensor is mounted in air inlet pipe, for acquiring in the air inlet pipe
Temperature information；
First pressure sensor, the first pressure sensor are mounted in air inlet pipe, for acquiring in the air inlet pipe
Pressure information；
Second temperature sensor, the second temperature sensor are mounted in air inlet pipe, for acquiring in the exhaust pipe
Temperature information；
Second pressure sensor, the second pressure sensor is mounted in air inlet pipe, for acquiring in the exhaust pipe
Pressure information.
Further, the extraction flow real-time measurement system for diesel engine SCR apparatus further include:
Signal processor, the input terminal of the signal processor are separately connected first temperature sensor, first pressure
The output end of sensor, second temperature sensor and second pressure sensor.
Further, the extraction flow real-time measurement system for diesel engine SCR apparatus further include:
The input terminal of urea injection control unit, the urea injection control unit connects the output of the signal processor
End, the signal processor input exhaust flow rate value to the urea injection control unit；
The control terminal of urea injection apparatus, the urea injection apparatus connects the urea injection control unit, ejection end
It protrudes into the selective catalytic reduction device SCR；The urea injection control unit controls institute according to the exhaust flow rate value
It states urea injection apparatus and sprays urea into selective catalytic reduction device SCR.
From the above as can be seen that the extraction flow provided by the utility model for diesel engine SCR apparatus is surveyed in real time
Amount system, has following advantages compared with prior art: based on flow through the extraction flow of SCR, temperature, pressure drop present it is positively related
Temperature and pressure drop that exhaust flows through SCR is calculated by the delivery temperature and pressure that measurement SCR is forward and backward in variation relation, into
And the SCR extraction flow-temperature-pressure drop MAP chart demarcated in advance is matched, obtain the real-time ventilation flow for flowing through SCR.Realizing should
The system of measurement method mainly includes pressure sensor, temperature sensor and signal processing apparatus.
The present invention can not need diesel engine intake flow and distributive value information, not need to diesel engine exhaust system yet
It carries out under the premise of being excessively transformed, real-time, reliable measurement is carried out to the extraction flow for flowing through SCR device.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
1. the first temperature sensor, 2. first pressure sensors, 3. signal processors, 4. urea injection control units, 5.
Second temperature sensor, 6. second pressure sensors, 7. selective catalytic reduction device SCR, 8. urea injection apparatus.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with specific embodiment, and
Referring to attached drawing, the utility model is further described.Wherein identical components are presented with like reference characters.It needs
Illustrate, word "front", "rear" used in the following description, "left", "right", "up" and "down" refer to the side in attached drawing
To.The word "inner" used and "outside" refer respectively to the direction towards or away from geometric center of specific component.
The present invention uses SCR extraction flow-temperature-pressure drop balancing method.Extraction flow, temperature when flowing through SCR, in SCR
There are positive correlations for front and back pressure drop, as shown in Figure 1.1 < temperature of temperature, 2 < temperature 3 in figure.It is produced in engine actual condition
In raw exhaust gas region (in figure red dashed rectangle in), there is apparent be positively correlated between pressure drop and close in extraction flow, temperature
System, and discrimination is obvious.
Based on above-mentioned theory, Tthe utility model system setting such as Fig. 1, the extraction flow for diesel engine SCR apparatus
Real-time measurement system includes:
The both ends difference air inlet of selective catalytic reduction device SCR7, the selective catalytic reduction device SCR7 and row
Port is connected with air inlet pipe and exhaust pipe on the air inlet and exhaust outlet respectively.
First temperature sensor 1, first temperature sensor 1 is mounted in air inlet pipe, for acquiring the air inlet pipe
In temperature information T1；
First pressure sensor 2, the first pressure sensor 2 is mounted in air inlet pipe, for acquiring the air inlet pipe
In pressure information P1；
Second temperature sensor 5, the second temperature sensor 5 is mounted in air inlet pipe, for acquiring the exhaust pipe
In temperature information T2；
Second pressure sensor 6, the second pressure sensor 6 is mounted in air inlet pipe, for acquiring the exhaust pipe
In pressure information P2；
Signal processor 3, the input terminal of the signal processor 3 are separately connected first temperature sensor 1, first and press
The output end of force snesor 2, second temperature sensor 5 and second pressure sensor 6, for obtaining the temperature in the air inlet pipe
Temperature information T2 and pressure information P2 in information T1 and pressure information P1 and exhaust pipe, and according in the air inlet pipe
Temperature information T2 and pressure information P2 in temperature information T1 and pressure information P1 and exhaust pipe calculate exhaust weighted average temperature
DegreeWith the exhaust drop off pressure Δ P before and after selective catalytic reduction device SCR7, and according to the exhaust weighted meanWith
Exhaust drop off pressure Δ P before and after the selective catalytic reduction device SCR7 row of matching in extraction flow-temperature-pressure drop MAP chart
Air flow value；Specifically, the signal processor is the prior art, can use model are as follows: the list of ACU1008140001
Piece machine.
Urea injection control unit 4, the input terminal of the urea injection control unit 4 connect the signal processor 3
Output end, the signal processor 3 input exhaust flow rate value to the urea injection control unit 4；
Urea injection apparatus 8, the control terminal of the urea injection apparatus 8 connect the urea injection control unit 4, spray
Outlet protrudes into the selective catalytic reduction device SCR7；The urea injection control unit 4 is according to the exhaust flow rate value
It controls the urea injection apparatus 8 and sprays urea into selective catalytic reduction device SCR7.
It is to be understood that
In formula,For the exhaust weighted mean for flowing through SCR；T1 is the delivery temperature of SCR entrance；T2 goes out for SCR
Delivery temperature at mouthful；K is coefficient, 0 k≤1 <.
Δ P=P1-P2
In formula, Δ P is exhaust drop off pressure before and after SCR；P1 is the pressure at expulsion of SCR entrance；P2 is the row in the exit SCR
Atmospheric pressure.
It should be understood by those ordinary skilled in the art that: the foregoing is merely specific embodiment of the utility model and
, it is not intended to limit the utility model, all any modifications within the purport of the utility model, made, change equivalent replacement
Into etc., it should be included within the scope of protection of this utility model.
Claims (3)
1. a kind of extraction flow real-time measurement system for diesel engine SCR apparatus, which is characterized in that described to be used for diesel engine
The extraction flow real-time measurement system of SCR device includes:
Selective catalytic reduction device SCR(7), the selective catalytic reduction device SCR(7) both ends difference air inlet and row
Port is connected with air inlet pipe and exhaust pipe on the air inlet and exhaust outlet respectively；
First temperature sensor (1), first temperature sensor (1) is mounted in air inlet pipe, for acquiring the air inlet pipe
In temperature information；
First pressure sensor (2), the first pressure sensor (2) is mounted in air inlet pipe, for acquiring the air inlet pipe
In pressure information；
Second temperature sensor (5), the second temperature sensor (5) is mounted in air inlet pipe, for acquiring the exhaust pipe
In temperature information；
Second pressure sensor (6), the second pressure sensor (6) is mounted in air inlet pipe, for acquiring the exhaust pipe
In pressure information.
2. being used for the extraction flow real-time measurement system of diesel engine SCR apparatus as described in claim 1, which is characterized in that institute
State the extraction flow real-time measurement system for diesel engine SCR apparatus further include:
Signal processor (3), the input terminal of the signal processor (3) are separately connected first temperature sensor (1), first
The output end of pressure sensor (2), second temperature sensor (5) and second pressure sensor (6).
3. being used for the extraction flow real-time measurement system of diesel engine SCR apparatus as claimed in claim 2, which is characterized in that institute
State the extraction flow real-time measurement system for diesel engine SCR apparatus further include:
The input terminal of urea injection control unit (4), the urea injection control unit (4) connects the signal processor (3)
Output end, signal processor (3) the Xiang Suoshu urea injection control unit (4) inputs exhaust flow rate value；
Urea injection apparatus (8), the control terminal of the urea injection apparatus (8) connect the urea injection control unit (4), spray
Outlet protrudes into the selective catalytic reduction device SCR(7) in；The urea injection control unit (4) is according to the exhaust stream
Magnitude controls the urea injection apparatus (8) and sprays urea into selective catalytic reduction device SCR(7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920070186.6U CN209637857U (en) | 2019-01-16 | 2019-01-16 | Extraction flow real-time measurement system for diesel engine SCR apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920070186.6U CN209637857U (en) | 2019-01-16 | 2019-01-16 | Extraction flow real-time measurement system for diesel engine SCR apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209637857U true CN209637857U (en) | 2019-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920070186.6U Active CN209637857U (en) | 2019-01-16 | 2019-01-16 | Extraction flow real-time measurement system for diesel engine SCR apparatus |
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| Country | Link |
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| CN (1) | CN209637857U (en) |
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2019
- 2019-01-16 CN CN201920070186.6U patent/CN209637857U/en active Active
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