CN103615299A - Method and system for designing diesel engine aftertreatment system - Google Patents
Method and system for designing diesel engine aftertreatment system Download PDFInfo
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- CN103615299A CN103615299A CN201310596006.5A CN201310596006A CN103615299A CN 103615299 A CN103615299 A CN 103615299A CN 201310596006 A CN201310596006 A CN 201310596006A CN 103615299 A CN103615299 A CN 103615299A
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Abstract
The invention provides a method and a system for designing a diesel engine aftertreatment system. The method includes: recording NOX, THC, CO and PM discharge and BSFC (brake specific fuel consumption) values under different injection combinations of diesel engine working condition test, when a diesel engine does not have any aftertreatment systems, so as to determine optimal timing and rail pressure parameters and determining optimal injection parameters based of a first optimization rule; designing multiple DOC (diesel oxidation catalyst) + CDPF (coated diesel particulate filter) catalyst sample structures based on universal characteristics of extraction flow and discharge temperature to prepare the corresponding catalysts, mounting the prepared catalysts on the diesel engine, recording PM conversion rate, backpressure and cost of the corresponding catalysts, and determining relevant information of the optimal catalyst based on a second optimization rule so as to prepare the optimal catalyst; mounting the optimal catalyst on the diesel engine with an optimized fuel system, recording NOX conversion rate and urea leakage rate of SCR (selective catalytic reduction), and determining optimal urea leakage rate based on a third optimization rule to have the aftertreatment system designed.
Description
Technical field
The present invention relates to diesel engine post-processing system, particularly relate to a kind of method and system that design diesel engine post-processing system.
Background technique
Diesel engine has the features such as power is large, economic performance is good.But the NO of diesel engine
xand granular material discharged generally higher, for this reason, various discharge treating systems also arise at the historic moment.
For example, in the Chinese patent literature that is 200880120587.2 at application number, disclose a kind of discharge treating system, it arranges diesel oxidation catalyst by the engine downstream position in waste gas streams path, reduces nitrogen oxide, particulate matter and gaseous hydrocarbon etc. in diesel exhaust stream.
Again for example, in the Chinese patent literature that is 201110208045.4 at application number, disclose a kind of exhaust gas aftertreatment system, it arranges discharge pipe line on exhausting air path of motor discharge, and gasoline particulate filter is set on this discharge pipe line the gas of discharge is processed.
Yet following emission standard is to NO
xvery harsh with the emission request of particulate matter, only emission controls by improving combustion is difficult to reach standard, need be by adjusting fuel oil strategy and adopting selective catalytic reduction (Selective Catalytic Reduction, SCR) urea-spray technology to reduce exhaust NO
x, and effectively remove the particulate matter in tail gas by diesel oxidation (Diesel Oxidation Catalyst, DOC)+have coating granule trapping (coated Diesel Particulate Filter, CDPF).
Wherein, SCR principle is that urea is mixed with proper proportion (concentration is generally 32.5%) with water, sprays in the waste gas of diesel engine discharge.Under catalyst action, as the urea of reducing agent at 230～500 ℃ by the NO in waste gas
xbe reduced into harmless N
2and H
2o, thus can be by the NO in diesel engine vent gas
xreduce more than 50%.DOC has good effect to the soluble organic principle removing in diesel particle, and soluble organic principle under the effect of noble metal catalyst, oxidation reaction occurs and is converted into CO
2and H
2o and removing.CDPF is coated catalysts on grain catcher DPF carrier, utilizes the priming reaction energy of Catalysts for Reducing particulate, makes particulate reach passive regeneration at diesel engine operating conditions in a big way.
Although DOC+CDPF has very high particle collection efficiency, how further to reduce NO
xconcentration is main difficulty.
Summary of the invention
The shortcoming of prior art, the object of the present invention is to provide a kind of method and system that design diesel engine post-processing system in view of the above, for solving Design of High Pressure Common Rail Diesel Engine NO
xdischarge and particulate matter quantity exist " trade-off " relation to exceed the problem of emission standard.
For achieving the above object and other relevant objects, the invention provides a kind of method that designs diesel engine post-processing system, it at least comprises:
Under situation at diesel engine without any after-treatment system, record each NO in each ESC working condition tests that diesel engine carries out based on different timings and rail pressure parameter
x, THC, CO, PM discharge and BSFC value, to determine optimum timing and rail pressure parameter;
Based on first principle of optimality, described optimum timing and rail pressure parameter, determine the optimum fuel injection parameter of diesel engine;
Based on extraction flow and delivery temperature mapping characteristics, design a plurality of DOC+CDPF catalyst converter sample structures, to prepare corresponding DOC+CDPF catalyst converter;
At diesel engine, be provided with under the situation of each prepared DOC+CDPF catalyst converter, when recording diesel engine and carrying out each ESC working condition tests based on determined optimum timing and rail pressure parameter, fuel injection parameter, the PM degree of conversion alpha of corresponding DOC+CDPF catalyst converter
pM, back pressure P
b, and cost;
PM degree of conversion alpha based on second principle of optimality, each DOC+CDPF catalyst converter of recording
pM, back pressure P
b, and cost, determine the relevant information of optimum DOC+CDPF catalyst converter;
At diesel engine, be provided with under the situation of optimum DOC+CDPF catalyst converter, record NOX conversion ratio and the urea leakage rate of each ESC working condition tests that diesel engine carries out based on each urea injecting quantity;
Based on the 3rd principle of optimality, the urea injecting quantity recording, NO
xconversion ratio and urea leakage rate are determined optimum urea injecting quantity, design thus the after-treatment system of diesel engine.
Preferably, first principle of optimality comprises: the NOx concentration minimum after Turbochargers in Diesel Engines and oil consumption concentration, particle concentration, THC concentration, CO concentration, BSFC are limited in respectively prespecified range separately; The prespecified range of more preferably, oil consumption concentration is below 102% of diesel engine reset condition; Particle concentration, THC concentration, CO concentration prespecified range are separately respectively below 95% of diesel engine reset condition separately; BSFC is below 102% of diesel engine reset condition.
Preferably, second principle of optimality comprises: DOC+CDPF catalyst converter cost minimization, the PM degree of conversion alpha after DOC+CDPF catalyst converter is processed
pMhigher than the first predetermined threshold, back pressure, be less than the second predetermined threshold.
Preferably, the 3rd principle of optimality comprises: the NO after SCR catalytic treatment
xconversion ratio
maximum, urea leakage rate
be less than the 3rd predetermined threshold.
The present invention also provides a kind of design system that designs diesel engine post-processing system, and it at least comprises:
Logging modle, under the situation without any after-treatment system at diesel engine, records each NO in each ESC working condition tests that diesel engine carries out based on different timings and rail pressure parameter
x, THC, CO, PM discharge and BSFC value, at diesel engine, be provided with under the situation of each prepared DOC+CDPF catalyst converter, when recording diesel engine and carrying out each ESC working condition tests based on determined optimum timing and rail pressure parameter, fuel injection parameter, the PM degree of conversion alpha of corresponding DOC+CDPF catalyst converter
pM, back pressure P
b, and cost, at diesel engine, be provided with under the situation of optimum DOC+CDPF catalyst converter, record the NO of each ESC working condition tests that diesel engine carries out based on each urea injecting quantity
xconversion ratio and urea leakage rate;
Design module, for designing a plurality of DOC+CDPF catalyst converter sample structures based on extraction flow and delivery temperature mapping characteristics, to prepare corresponding DOC+CDPF catalyst converter;
Optimize module, for determine the optimum fuel injection parameter of diesel engine, PM degree of conversion alpha based on second principle of optimality, each DOC+CDPF catalyst converter sample of recording based on first principle of optimality, described optimum timing and rail pressure parameter
pM, back pressure P
b, and cost, determine the relevant information of optimum DOC+CDPF catalyst converter, based on the 3rd principle of optimality, the urea injecting quantity recording, NO
xconversion ratio and urea leakage rate are determined optimum urea injecting quantity.
Preferably, described logging modle builds based on diesel engine test stand.
Preferably, the design of experiment software of described determination module based on diesel engine builds.
Preferably, the Optimization Software of described optimization module based on diesel engine builds.
As mentioned above, the method and system of design diesel engine post-processing system of the present invention, have following beneficial effect: based on optimizing fuel oil injection strategy and SCR control strategy, in conjunction with DOC+CDPF type selecting and design, design forming one to meet standard NO
xdischarge is for primary goal, ammonia leaked and particulate matter quantity, mass concentration are limited to the after-treatment system in critical field simultaneously.
Accompanying drawing explanation
Fig. 1 is shown as the design system schematic diagram of design diesel engine post-processing system of the present invention.
Fig. 2 is shown as the flow chart of the design method of design diesel engine post-processing system of the present invention.
Element numbers explanation
1 design system
11 logging modles
12 design modules
13 optimize module
S1～S7 step
Embodiment
Below, by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this specification.The present invention can also be implemented or be applied by other different embodiment, and the every details in this specification also can be based on different viewpoints and application, carries out various modifications or change not deviating under spirit of the present invention.
Refer to Fig. 1 to Fig. 2.It should be noted that, the diagram providing in the present embodiment only illustrates basic conception of the present invention in a schematic way, satisfy and only show with assembly relevant in the present invention in graphic but not component count, shape and size drafting while implementing according to reality, during its actual enforcement, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly layout kenel also may be more complicated.
As shown in Figure 1, the invention provides a kind of design system that designs diesel engine post-processing system.Described design system 1 at least comprises: logging modle 11, design module 12 and optimization module 13.
Described logging modle 11 is carried out ESC(european stationary cycle for recording diesel engine, Europe steady state test circulation) relevant information of different fuel injection parameter tests under each operating mode, for example, under situation at diesel engine without any after-treatment system, described logging modle 11 records each NO in each working condition tests of ESC that diesel engine carries out based on different timings and rail pressure parameter
x, THC, CO, PM discharge and BSFC value etc.; Again for example, at diesel engine, be provided with under the situation of each prepared DOC+CDPF catalyst converter, described logging modle 11 records diesel engine while carrying out each ESC working condition tests based on determined optimum timing and rail pressure parameter, fuel injection parameter, the PM degree of conversion alpha of corresponding DOC+CDPF catalyst converter sample
pM, back pressure P
b, and cost etc.; Again for example, at diesel engine, be provided with under the situation based on optimum DOC+CDPF catalyst converter, described logging modle 11 records the NO of each ESC working condition tests that diesel engine carries out based on each urea injecting quantity
xconversion ratio and urea leakage rate etc.
Described logging modle 11 can build based on any device or module that can realize above-mentioned functions, for example, builds etc. based on diesel engine test stand.
Described design module 12 designs a plurality of DOC+CDPF catalyst converter sample structures based on extraction flow and delivery temperature mapping characteristics, to prepare corresponding DOC+CDPF catalyst converter.
Described determination module 12 can build based on any device or module that can realize above-mentioned functions, for example, based on diesel engine design of experiment software, for example, JMP software builds etc.
Described optimization module 13 is determined DOC+CDPF catalyst converter and is processed each relevant parameter to SCR for each relevant information recording based on described logging modle 11.For example, described optimization module 13 is determined the optimum fuel injection parameter of diesel engine based on first principle of optimality, described optimum timing and rail pressure parameter; Again for example, the PM degree of conversion alpha of described optimization module 13 based on second principle of optimality, each DOC+CDPF catalyst converter sample of recording
pM, back pressure P
b, and cost, determine the relevant information of optimum DOC+CDPF catalyst converter; Again for example, described optimization module 13 is based on the 3rd principle of optimality, the urea injecting quantity recording, NO
xconversion ratio and urea leakage rate are determined optimum urea injecting quantity etc.
Described optimization module 13 can build based on any device or module that can realize above-mentioned functions, for example, based on diesel engine Optimization Software, for example, LINDO software builds etc.
A kind of preferred workflow of above-mentioned design system 1 as shown in Figure 2.
In step S1, under the situation at diesel engine without any after-treatment system, logging modle 11 records each NO in each ESC working condition tests that diesel engine carries out based on different timings and rail pressure parameter
x, THC, CO, PM discharge and BSFC value, to determine optimum timing and rail pressure parameter.
Particularly, timing, the rail pressure of diesel engine of take is variable, do not install under the condition of any reprocessing and carries out different fuel injection parameters tests under each operating mode of ESC.Wherein, testing program one has 13 operating points, has 80～100 the test point of being designed by space-filling design software under each operating point, and diesel engine test stand records under each operating point the NO of diesel engine under each test point automatically
x, THC, CO, PM discharge and BSFC.
In step S2, optimize module 13 and based on first principle of optimality, described optimum timing and rail pressure parameter, determine the optimum fuel injection parameter of diesel engine.
Particularly, the Optimization Software of diesel engine calculates according to first principle of optimality, calculates optimum timing, rail pressure parameter.Wherein, first principle of optimality as shown in the formula:
In step S3, design module 12 designs a plurality of DOC+CDPF catalyst converter sample structures based on extraction flow and delivery temperature mapping characteristics, to prepare corresponding DOC+CDPF catalyst converter.
Particularly, the design of experiment software of diesel engine designs a series of DOC+CDPF test specimen structures according to extraction flow and delivery temperature mapping characteristics.
In step S4, at diesel engine, be provided with under the situation of each prepared DOC+CDPF catalyst converter, logging modle 11 records diesel engine while carrying out each ESC working condition tests based on determined optimum timing and rail pressure parameter, fuel injection parameter, the PM degree of conversion alpha of corresponding DOC+CDPF catalyst converter
pM, back pressure P
b, and cost.
In step S5, optimize the PM degree of conversion alpha of module 13 based on second principle of optimality, each DOC+CDPF catalyst converter of recording
pM, back pressure P
b, and cost, determine the relevant information of optimum DOC+CDPF catalyst converter.
Particularly, Optimization Software calculates according to second principle of optimality, and optimizes structure and the coating formula of optimum DOC+CDPF, so that the structure based on this optimum DOC+CDPF and coating formula are prepared optimum DOC+CDPF catalyst converter.Wherein, second principle of optimality as shown in the formula:
In step S6, at diesel engine, be provided with under the situation of optimum DOC+CDPF catalyst converter, logging modle 11 records the NO of each ESC working condition tests that diesel engine carries out based on each urea injecting quantity
xconversion ratio and urea leakage rate.
Particularly, to adding optimum DOC+CDPF catalyst converter and adopting optimum timing and the diesel engine of rail pressure parameter, optimum fuel injection parameter, carry out the experiment of SCR urea injecting quantity.Adopt 9 diesel engine condition points in abovementioned steps S1 to carry out one by one urea injecting quantity optimization.Under each test operating mode, SCR urea-spray control unit calibration tool is with the urea injecting quantity variable of SCR, in original urea injecting quantity ± 30% scope, take and 5% as interval, carries out urea-spray, and diesel engine test stand records the NO of operating mode, SCR automatically
xconversion ratio and urea leakage rate.
In step S7, optimize module 13 based on the 3rd principle of optimality, the urea injecting quantity recording, NO
xconversion ratio and urea leakage rate are determined optimum urea injecting quantity, carry out thus to determine the after-treatment system of diesel engine.
Particularly, Optimization Software calculates according to the 3rd principle of optimality, calculates and optimize urea injecting quantity best under each operating mode.The 3rd principle of optimality as shown in the formula:
In addition, also the diesel engine that disposes optimum timing and rail pressure parameter, optimum fuel injection parameter can be installed to optimum DOC+CDPF catalyst converter, and adopt aforementioned definite optimum urea injecting quantity to carry out assembly test, if pinpointed the problems, above-mentioned steps 7 is finely tuned, design thus the after-treatment system of diesel engine.
It should be noted that, the order of each step is not limited with described above, and for example, step S3 can be before step S1 or S2 or carried out etc. simultaneously.
In sum, the method and system of design diesel engine post-processing system of the present invention, based on first oil consumption and the particle concentration that initiatively promotes diesel engine 2%, make the NO of exhaust
xit is minimum that concentration reaches; And dense for the particulate matter quantity, the quality that raise, the strategy being made up by the high particle collection efficiency of DOC+CDPF, in conjunction with DOC+CDPF type selecting and design, design forming one to meet standard NO
xdischarge is for primary goal, ammonia leaked and particulate matter quantity, mass concentration are limited to the after-treatment system in critical field simultaneously; Thus, can make the waste gas based on adopting the designed after-treatment system of the present invention to process, its ammonia leakage and particulate matter quantity, mass concentration all can be limited in critical field.So the present invention has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (9)
1. a method that designs diesel engine post-processing system, is characterized in that, the method for described design diesel engine post-processing system at least comprises:
Under situation at diesel engine without any after-treatment system, record each NO in each ESC working condition tests that diesel engine carries out based on different timings and rail pressure parameter
x, THC, CO, PM discharge and BSFC value, to determine optimum timing and rail pressure parameter;
Based on first principle of optimality, described optimum timing and rail pressure parameter, determine the optimum fuel injection parameter of diesel engine;
Based on extraction flow and delivery temperature mapping characteristics, design a plurality of DOC+CDPF catalyst converter sample structures, to prepare corresponding DOC+CDPF catalyst converter;
At diesel engine, be provided with under the situation of each prepared DOC+CDPF catalyst converter, when recording diesel engine and carrying out each ESC working condition tests based on determined optimum timing and rail pressure parameter, fuel injection parameter, PM conversion ratio, back pressure and the cost of corresponding DOC+CDPF catalyst converter;
PM conversion ratio, back pressure and cost based on second principle of optimality, each DOC+CDPF catalyst converter of recording, determine the relevant information of optimum DOC+CDPF catalyst converter, to prepare optimum DOC+CDPF catalyst converter;
At diesel engine, be provided with under the situation of optimum DOC+CDPF catalyst converter, record the NO of each ESC working condition tests that diesel engine carries out based on each urea injecting quantity
xconversion ratio and urea leakage rate;
Based on the 3rd principle of optimality, the urea injecting quantity recording, NO
xconversion ratio and urea leakage rate are determined optimum urea injecting quantity, design thus the after-treatment system of diesel engine.
2. the method for design diesel engine post-processing system according to claim 1, is characterized in that: first principle of optimality comprises: the NOx concentration minimum after Turbochargers in Diesel Engines and oil consumption concentration, particle concentration, THC concentration, CO concentration, BSFC are limited in respectively prespecified range separately.
3. the method for design diesel engine post-processing system according to claim 2, is characterized in that: the prespecified range of oil consumption concentration is below 102% of diesel engine reset condition; Particle concentration, THC concentration, CO concentration prespecified range are separately respectively below 95% of diesel engine reset condition separately; BSFC is below 102% of diesel engine reset condition.
4. the method for design diesel engine post-processing system according to claim 1, is characterized in that: second principle of optimality comprises: DOC+CDPF catalyst converter cost minimization, the PM conversion ratio after DOC+CDPF catalyst converter is processed are less than the second predetermined threshold higher than the first predetermined threshold, back pressure.
5. the method for design diesel engine post-processing system according to claim 1, is characterized in that: the 3rd principle of optimality comprises: the NO after SCR catalytic treatment
xconversion ratio is maximum, urea leakage rate is less than the 3rd predetermined threshold.
6. a design system that designs diesel engine post-processing system, is characterized in that, the design system of described design diesel engine post-processing system at least comprises:
Logging modle, under the situation without any after-treatment system at diesel engine, records each NO in each ESC working condition tests that diesel engine carries out based on different timings and rail pressure parameter
x, THC, CO, PM discharge and BSFC value, at diesel engine, be provided with under the situation of each prepared DOC+CDPF catalyst converter, when recording diesel engine and carrying out each ESC working condition tests based on determined optimum timing and rail pressure parameter, fuel injection parameter, PM conversion ratio, back pressure and the cost of corresponding DOC+CDPF catalyst converter, at diesel engine, be provided with under the situation of optimum DOC+CDPF catalyst converter, record the NO of each ESC working condition tests that diesel engine carries out based on each urea injecting quantity
xconversion ratio and urea leakage rate;
Design module, for designing a plurality of DOC+CDPF catalyst converter sample structures based on extraction flow and delivery temperature mapping characteristics, to prepare corresponding DOC+CDPF catalyst converter;
Optimize module, for determine the optimum fuel injection parameter of diesel engine, PM conversion ratio, back pressure and cost based on second principle of optimality, each DOC+CDPF catalyst converter sample of recording based on first principle of optimality, described optimum timing and rail pressure parameter, determine the relevant information of optimum DOC+CDPF catalyst converter, based on the 3rd principle of optimality, the urea injecting quantity recording, NO
xconversion ratio and urea leakage rate are determined optimum urea injecting quantity.
7. the design system of design diesel engine post-processing system according to claim 6, is characterized in that: described logging modle builds based on diesel engine test stand.
8. the design system of design diesel engine post-processing system according to claim 1, is characterized in that: the design of experiment software of described determination module based on diesel engine builds.
9. the design system of design diesel engine post-processing system according to claim 1, is characterized in that: the Optimization Software of described optimization module based on diesel engine builds.
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| CN103615299B (en) | 2015-10-28 |
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