CN104763498A - Diesel engine nitrogen oxide after-treatment system, control method and application - Google Patents
Diesel engine nitrogen oxide after-treatment system, control method and application Download PDFInfo
- Publication number
- CN104763498A CN104763498A CN201510097033.7A CN201510097033A CN104763498A CN 104763498 A CN104763498 A CN 104763498A CN 201510097033 A CN201510097033 A CN 201510097033A CN 104763498 A CN104763498 A CN 104763498A
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- Prior art keywords
- nitrogen oxide
- diesel engine
- treatment system
- engine nitrogen
- urea
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Links
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000004202 carbamide Substances 0.000 claims abstract description 39
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 37
- 230000003197 catalytic effect Effects 0.000 claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 56
- 239000007921 spray Substances 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012937 correction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- ZJHHPAUQMCHPRB-UHFFFAOYSA-N urea urea Chemical compound NC(N)=O.NC(N)=O ZJHHPAUQMCHPRB-UHFFFAOYSA-N 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
A diesel engine nitrogen oxide after-treatment system comprises an exhaust tube, a catalytic reactor, a urea injection system, a controller and a nitrogen oxide sensor and further comprises a mass flow meter in the exhaust tube and a pressure difference sensor, a temperature sensor and an absolute pressure sensor which are matched with the mass flow meter. The sensors are all connected with the controller which can adjust the injection quantity of the urea injection system according to input signals. The system has the advantages that real-time measuring and calculation of nitrogen oxides can be achieved without depending on calibration of an after-treatment system engine. Besides, the invention further relates to a control method and an application of the after-treatment system.
Description
Technical field
The present invention relates to a kind of diesel engine nitrogen oxide after-treatment system, controlling method and application thereof, particularly relate to a kind of do not rely on demarcation diesel engine nitrogen oxide after-treatment system, controlling method and application thereof.
Background technique
The application of large engine aftertreatment system and the difference of puffer very large.For the mini engine motor of specific vehicle, the after-treatment system demarcated can be sold more than several thousand and overlap, and it is very low to share calibration cost equally.The after-treatment system order of magnitude for large motor is tens, mostly is hundreds of most.And large engine types is various, application type is changeable, and staking-out work is complicated and demarcate that to share cost equally very high.At timing signal, need large power measurer, consume great amount of fuel oil, therefore demarcate difficulty, cost is high.Such as, some obsolete vessel transformation project, does not namely have space mounting power measurer, cannot realize complete alternation change when boats and ships are static yet.Even if can be realized by specific process, each fuel consume of demarcating calculates in units of ten thousand yuan.Again such as, based on engine operating condition, the after-treatment system of the off-line test experimental shop of some diesel engine factory, the often motor of a corresponding multiple stage different capacity of outlet pipe, judge that the after-treatment system of emitted dose obviously cannot be applied by demarcating.
Therefore, need to provide a kind of new scheme to solve the problems of the technologies described above.
Summary of the invention
The object of the present invention is to provide a kind of do not rely on demarcation diesel engine nitrogen oxide after-treatment system, controlling method and application thereof.
For achieving the above object, the present invention adopts following technological scheme: a kind of diesel engine nitrogen oxide after-treatment system not relying on demarcation, described diesel engine nitrogen oxide after-treatment system comprises the outlet pipe in order to be connected with motor, be positioned at the catalytic reactor of described outlet pipe, in order to spray the urea injection system of urea in described outlet pipe, in order to control the controller of described diesel engine nitrogen oxide after-treatment system and to be arranged between described motor and described catalytic reactor and NOx sensor in order to measure nitrous oxides concentration in described outlet pipe, described diesel engine nitrogen oxide after-treatment system also comprises the mass flowmenter being arranged in described outlet pipe, the differential pressure pickup matched with described mass flowmenter, in order to measure the temperature transducer of delivery temperature and the absolute pressure transducer in order to measure exhaust absolute pressure, wherein said differential pressure pickup, described temperature transducer, described absolute pressure transducer and described NOx sensor are all connected with described controller, described controller adjusts the emitted dose of described urea injection system according to the signal of input.
As further improved technical scheme of the present invention, described mass flow rate counts Venturi tube or Pitot tube or vortex-shedding meter.
As further improved technical scheme of the present invention, described mass flow rate counts Venturi tube, described Venturi tube is provided with first cross section and the second cross section with different cross-sectional, and described differential pressure pickup is in order to measure exhaust at the pressure reduction through described first cross section and described second cross section.
As further improved technical scheme of the present invention, one end of described differential pressure pickup is connected to described first section, and the other end of described differential pressure pickup is connected to described second section.
As further improved technical scheme of the present invention, described differential pressure pickup, described temperature transducer and described absolute pressure transducer are all positioned at the upstream of described catalytic reactor.
As further improved technical scheme of the present invention, described differential pressure pickup, described temperature transducer and described absolute pressure transducer are all positioned at the downstream of described catalytic reactor.
As further improved technical scheme of the present invention, described catalytic reactor is selective catalytic reducing agent.
As further improved technical scheme of the present invention, described urea injection system comprises urea box, the pump be connected with described urea box and is connected with described pump and urea nozzle in order to spray urea in described outlet pipe, has signal and communication between described urea nozzle and described controller.
Present invention also offers a kind of controlling method of diesel engine nitrogen oxide after-treatment system, it is characterized in that, described diesel engine nitrogen oxide after-treatment system is above-mentioned diesel engine nitrogen oxide after-treatment system, and described controlling method comprises:
The signal detected is sent to described controller by described differential pressure pickup, described temperature transducer, described absolute pressure transducer and described NOx sensor;
Described controller goes out to need in described outlet pipe the total discharge of nitrogen oxide to be processed according to above-mentioned calculated signals;
Described controller calculates urea-spray rate according to the mass flow meters of described nitrogen oxide, and controls described urea injection system.
Present invention also offers the application of a kind of diesel engine nitrogen oxide after-treatment system in the after-treatment system of high output diesel engine, it is characterized in that, described diesel engine nitrogen oxide after-treatment system is above-mentioned diesel engine nitrogen oxide after-treatment system, and the power of described high output diesel engine is more than 500 kilowatts.
Compared to prior art, invention increases mass flowmenter, by measurement parameters such as differential pressure pickup, temperature transducer, absolute pressure transducer and described NOx sensor, the real-time surveying and calculating of nitrogen oxide can be realized.Described controller adjusts the emitted dose of described urea injection system according to the signal of input, no longer relies on this process of after-treatment system engine calibration.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of diesel engine nitrogen oxide after-treatment system of the present invention.
Fig. 2 is the partial schematic sectional view of mass flowmenter of the present invention, differential pressure pickup and outlet pipe.
Embodiment
Shown in please refer to the drawing 1 and Fig. 2, present invention is disclosed a kind of diesel engine nitrogen oxide after-treatment system 100 not relying on demarcation, it comprise the outlet pipe 1 in order to be connected with motor 200, the catalytic reactor 2 in described outlet pipe 1, in order to spray in described outlet pipe 1 urea urea injection system 3, in order to control the controller 4 of described diesel engine nitrogen oxide after-treatment system 100 and to be arranged between described motor 200 and described catalytic reactor 2 and NOx sensor 51 in order to measure nitrous oxides concentration in described outlet pipe 1.
In one embodiment of the invention, described diesel engine nitrogen oxide after-treatment system 100 is applied in the after-treatment system of high output diesel engine, and so-called high output diesel engine generally refers to that its power is more than 500 kilowatts.
Demarcation in view of high output diesel engine after-treatment system is difficulty and costliness, in the application of some complexity or even impossible.Diesel engine nitrogen oxide after-treatment system 100, controlling method and the application thereof not relying on demarcation of the present invention can allow user realize " plug and play ", exempts and demarcates this process, can reduce integrated difficulty and installation cost.
In illustrative embodiments of the present invention, described catalytic reactor 2 is selective catalytic reducing agent (SCR).
Shown in please refer to the drawing 1, described diesel engine nitrogen oxide after-treatment system 100 also comprises the mass flowmenter 6 being arranged in described outlet pipe 1, the differential pressure pickup 52 matched with described mass flowmenter 6, in order to measure the temperature transducer 53 of delivery temperature and the absolute pressure transducer 54 in order to measure exhaust absolute pressure, wherein said differential pressure pickup 52, described temperature transducer 53, described absolute pressure transducer 54 and described NOx sensor 51 are all connected with described controller 4, described controller 4 adjusts the emitted dose of described urea injection system 3 according to the signal of input.
In illustrative embodiments of the present invention, described urea injection system 3 comprises urea box 31, the pump 32 be connected with described urea box 31 and is connected with described pump 32 and urea nozzle 33 in order to spray urea in described outlet pipe 1, has signal and communication between described urea nozzle 33 and described controller 4.
Shown in please refer to the drawing 2, in illustrative embodiments of the present invention, described mass flowmenter 6 is Venturi tube.Certainly, person of ordinary skill in the field can understand, and described mass flowmenter 6 can also be Pitot tube or vortex-shedding meter etc.
Below only for Venturi tube, in conjunction with formula, the present invention will be described.Certainly, make reference to the text-book, Pitot tube or vortex-shedding meter also have corresponding algorithm, and this algorithm can be understood person of ordinary skill in the field, does not repeat them here.
From structure, described Venturi tube is provided with first cross section and the second cross section with different cross-sectional, can know the numerical relation in described first cross section and described second cross section when designing.
Shown in please refer to the drawing 2, one end of described differential pressure pickup 52 is connected to described first section, and the other end is connected to described second section, to measure exhaust (waste gas) at the pressure reduction △ P through described first cross section and described second cross section, △ P=P1-P2, wherein:
P1 represents the pressure of the first section;
P2 represents the pressure of the first section;
Described pressure reduction △ P can be recorded by described differential pressure pickup 52.
Because the Mach number of the exhaust air flow in described outlet pipe 1 is generally less than 0.3, can calculate according to incompressible fluid.For particular moment, the exhaust air flow in described outlet pipe 1 can be considered stable state.
Based on above analysis, the exhaust air flow in described outlet pipe 1 meets following formula:
(1) equation of continuity: A1v1=A2v2, wherein:
A1 represents the sectional area in the first cross section;
V1 represents that exhaust is at the flow velocity through the first cross section;
A2 represents the sectional area in the second cross section;
V2 represents that exhaust is at the flow velocity through the second cross section;
(2) Bernoulli's equation:
, wherein:
P1 represents the pressure of the first section;
V1 represents that exhaust is at the flow velocity through the first cross section;
P2 represents the pressure of the second section;
V2 represents that exhaust is at the flow velocity through the second cross section;
represent exhaust gas density;
(3) gas equation:
, wherein:
P represents the exhaust pressure in outlet pipe;
R
grepresent constant, such as R
g=28.8;
T represents delivery temperature;
represent exhaust gas density;
(4) design given: A1=mA2, wherein:
A1 represents the sectional area in the first cross section;
A2 represents the sectional area in the second cross section;
M represents coefficient;
According to above equation (1) ~ (4), can draw:
(5)
wherein:
V1 represents that exhaust is at the flow velocity through the first cross section;
N represents coefficient;
△ P represents that exhaust is at the pressure reduction through the first cross section and the second cross section;
T represents delivery temperature;
P represents the exhaust pressure in outlet pipe;
And exhaust flow rate v1 and exhaust mass flow in close relations, can estimate according to following formula:
(6)
wherein:
M
. exhrepresent exhaust mass flow;
K represents correction factor;
A
0represent the sectional area of position shown in Fig. 2;
△ P represents that exhaust is at the pressure reduction through the first cross section and the second cross section;
P represents the exhaust pressure in outlet pipe;
R
grepresent the gas constant of engine exhaust, it is generally acknowledged R
g=28.8;
T represents delivery temperature;
Exhaust mass flow m can be calculated by above-mentioned formula
. exh, then the Spraying rate m of the required urea sprayed can be calculated in conjunction with following formula
. urea
(7)
, wherein:
M
. urearepresent the Spraying rate of urea;
S represents correction factor;
C
urearepresent the concentration of aqueous solution of urea;
NSR represents the target elimination factor of nitrogen oxide;
N represents the volume concentration of nitrogen oxide;
M
. exhrepresent exhaust mass flow;
In sum, measured by described temperature transducer 53 and obtain delivery temperature T, measured by described absolute pressure transducer 54 and obtain exhaust pressure P, and the mean velocity of the ingress of Venturi tube just can be calculated in conjunction with above-mentioned formula, so just can by the exhaust flow rate in pipeline be estimated.Measure the volume concentration N obtaining nitrogen oxide again according to described NOx sensor 51, then can calculate the total discharge of the nitrogen oxide in outlet pipe 1.On this basis, controller 4 controls described urea nozzle 33 according to the total discharge of the nitrogen oxide in outlet pipe 1, determines corresponding emitted dose, completes the injection of reducing agent, realizes reducing discharging.
In illustrative embodiments of the present invention, described differential pressure pickup 52, described temperature transducer 53 and described absolute pressure transducer 54 are all positioned at the upstream of described catalytic reactor 2.It will be appreciated, of course, that described differential pressure pickup 52, described temperature transducer 53 and described absolute pressure transducer 54 also all can be positioned at the downstream of described catalytic reactor 2.
Present invention also offers a kind of controlling method of diesel engine nitrogen oxide after-treatment system, it is characterized in that, described diesel engine nitrogen oxide after-treatment system is above-mentioned diesel engine nitrogen oxide after-treatment system 100, and described controlling method comprises:
The signal detected is sent to described controller 4 by described differential pressure pickup 52, described temperature transducer 53, described absolute pressure transducer 54 and described NOx sensor 51;
Described controller 4 goes out to need in described outlet pipe 1 total discharge of nitrogen oxide to be processed according to above-mentioned calculated signals;
Described controller 4 calculates urea-spray rate according to the mass flow meters of described nitrogen oxide, and controls described urea injection system 3.
Compared to prior art, invention increases mass flowmenter 6, by measurement parameters such as differential pressure pickup 52, temperature transducer 53, absolute pressure transducer 54 and described NOx sensor 51, the real-time surveying and calculating of nitrogen oxide can be realized.Described controller 4 adjusts the emitted dose of described urea injection system 3 according to the signal of input, no longer relies on this process of after-treatment system engine calibration.
In addition, above embodiment is only for illustration of the present invention and unrestricted technological scheme described in the invention, understanding of this description should based on person of ordinary skill in the field, although this specification reference the above embodiments are to present invention has been detailed description, but, those of ordinary skill in the art is to be understood that, person of ordinary skill in the field still can modify to the present invention or equivalent replacement, and all do not depart from technological scheme and the improvement thereof of the spirit and scope of the present invention, all should be encompassed in right of the present invention.
Claims (10)
1. one kind does not rely on the diesel engine nitrogen oxide after-treatment system of demarcation, described diesel engine nitrogen oxide after-treatment system comprises the outlet pipe in order to be connected with motor, be positioned at the catalytic reactor of described outlet pipe, in order to spray the urea injection system of urea in described outlet pipe, in order to control the controller of described diesel engine nitrogen oxide after-treatment system and to be arranged between described motor and described catalytic reactor and NOx sensor in order to measure nitrous oxides concentration in described outlet pipe, it is characterized in that: described diesel engine nitrogen oxide after-treatment system also comprises the mass flowmenter being arranged in described outlet pipe, the differential pressure pickup matched with described mass flowmenter, in order to measure the temperature transducer of delivery temperature and the absolute pressure transducer in order to measure exhaust absolute pressure, wherein said differential pressure pickup, described temperature transducer, described absolute pressure transducer and described NOx sensor are all connected with described controller, described controller adjusts the emitted dose of described urea injection system according to the signal of input.
2. diesel engine nitrogen oxide after-treatment system as claimed in claim 1, is characterized in that: described mass flow rate counts Venturi tube or Pitot tube or vortex-shedding meter.
3. diesel engine nitrogen oxide after-treatment system as claimed in claim 2, it is characterized in that: described mass flow rate counts Venturi tube, described Venturi tube is provided with first cross section and the second cross section with different cross-sectional, and described differential pressure pickup is in order to measure exhaust at the pressure reduction through described first cross section and described second cross section.
4. diesel engine nitrogen oxide after-treatment system as claimed in claim 3, it is characterized in that: one end of described differential pressure pickup is connected to described first section, the other end of described differential pressure pickup is connected to described second section.
5. diesel engine nitrogen oxide after-treatment system as claimed in claim 1, is characterized in that: described differential pressure pickup, described temperature transducer and described absolute pressure transducer are all positioned at the upstream of described catalytic reactor.
6. diesel engine nitrogen oxide after-treatment system as claimed in claim 1, is characterized in that: described differential pressure pickup, described temperature transducer and described absolute pressure transducer are all positioned at the downstream of described catalytic reactor.
7. diesel engine nitrogen oxide after-treatment system as claimed in claim 1, is characterized in that: described catalytic reactor is selective catalytic reducing agent.
8. diesel engine nitrogen oxide after-treatment system as claimed in claim 1, it is characterized in that: described urea injection system comprises urea box, the pump be connected with described urea box and is connected with described pump and urea nozzle in order to spray urea in described outlet pipe, has signal and communication between described urea nozzle and described controller.
9. a controlling method for diesel engine nitrogen oxide after-treatment system, is characterized in that, described diesel engine nitrogen oxide after-treatment system is the diesel engine nitrogen oxide after-treatment system described in any one in claim 1 to 8, and described controlling method comprises:
The signal detected is sent to described controller by described differential pressure pickup, described temperature transducer, described absolute pressure transducer and described NOx sensor;
Described controller goes out to need in described outlet pipe the total discharge of nitrogen oxide to be processed according to above-mentioned calculated signals;
Described controller calculates urea-spray rate according to the mass flow meters of described nitrogen oxide, and controls described urea injection system.
10. the application of a diesel engine nitrogen oxide after-treatment system in the after-treatment system of high output diesel engine, it is characterized in that, described diesel engine nitrogen oxide after-treatment system is the diesel engine nitrogen oxide after-treatment system described in any one in claim 1 to 8, and the power of described high output diesel engine is more than 500 kilowatts.
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| CN201510097033.7A CN104763498B (en) | 2015-03-05 | 2015-03-05 | Diesel engine nitrogen oxides after-treatment system, control method and its application |
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| CN106703950A (en) * | 2017-03-10 | 2017-05-24 | 河北索奇汽车电子科技有限公司 | Independent SCR aftertreatment system and method |
| CN107269354A (en) * | 2016-04-06 | 2017-10-20 | 福特环球技术公司 | Emission control systems and reducing agent injector |
| CN107328893A (en) * | 2017-06-23 | 2017-11-07 | 东风商用车有限公司 | Gas buffer for improving measurement accuracy of NOx of engine |
| WO2018107464A1 (en) * | 2016-12-16 | 2018-06-21 | 罗伯特·博世有限公司 | Exhaust gas aftertreatment system for diesel engine and method of detecting abnormal injection |
| CN110848004A (en) * | 2019-12-19 | 2020-02-28 | 无锡亿利环保科技有限公司 | Multistage parallel SCR system |
| CN110905644A (en) * | 2019-12-31 | 2020-03-24 | 潍柴动力股份有限公司 | Exhaust mixing device and engine |
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| CN110905644A (en) * | 2019-12-31 | 2020-03-24 | 潍柴动力股份有限公司 | Exhaust mixing device and engine |
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| Publication number | Publication date |
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| CN104763498B (en) | 2017-06-23 |
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