CN104729837A - Performance testing method and system for diesel oxidation catalyst (DOC) - Google Patents
Performance testing method and system for diesel oxidation catalyst (DOC) Download PDFInfo
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- CN104729837A CN104729837A CN201310714329.XA CN201310714329A CN104729837A CN 104729837 A CN104729837 A CN 104729837A CN 201310714329 A CN201310714329 A CN 201310714329A CN 104729837 A CN104729837 A CN 104729837A
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Abstract
The invention provides a performance testing method for a diesel oxidation catalyst (DOC). The performance testing method for the diesel oxidation catalyst (DOC) comprises the following steps that the concentration of hydrocarbon in tail gas exhausted by an engine is adjusted to the preset concentration; the tail gas which is adjusted to the preset concentration is pumped into the DOC, and catalytic conversion is performed on the hydrocarbon and carbon monoxide in the tail gas through the DOC; the inlet temperature and the outlet temperature of the DOC when the tail gas passes through the DOC are measured; the catalytic conversion characteristics of the DOC on the hydrocarbon and the carbon monoxide in the tail gas at the current inlet temperature are obtained according to the temperature difference between the outlet temperature and the inlet temperature of the DOC. According to the embodiment of the performance testing method for the diesel oxidation catalyst (DOC), a performance curve of the diesel oxidation catalyst (DOC) can be easily, accurately and objectively tested. The invention further provides a testing system for the diesel oxidation catalyst (DOC).
Description
Technical field
The present invention relates to automobile technical field, particularly the performance test methods of a kind of diesel oxidation converter DOC and system.
Background technology
Energy saving standard is topmost target and requirement in current advanced engine development, in order to meet higher Abgasgesetz, except purification techniques in the cylinders such as improvement engine combustion, optimization engine control, also needs to adopt advanced emission aftertreatment technology.Wherein DOC(diesel oxidation catalyst) be one of technology of widespread use on a diesel engine, testing accurately the performance of DOC and evaluate is the key link that Exhaust Control of Engine is developed, also be the basic test of discharge post-treatment system matching and calibration, under the performance of DOC is mainly manifested in different gas temperatures, to emission HC(hydrocarbon) and CO(carbon monoxide) catalytic conversion efficiency, i.e. light off characteristics.At present, be all based on TWC(triple effect catalytic converter to the Apparatus and method for of the performance test of DOC in industry) performance test and evaluation method.
As shown in Figure 6, by gathering gaseous effluent S1 and S2 of DOC rear and front end simultaneously in existing DOC performance evaluation equipment, the concentration of HC and CO before and after gas analyzer C analyzes, obtains the DOC catalytic conversion efficiency under a certain temperature T1 state.
There is following shortcoming in existing DOC performance evaluation equipment, needs two-way gas discharging analyser, and need before test to carry out demarcation calibration to emission analyzer.The construction cost of very big raising pilot system, also brings larger operation and maintenance cost, simultaneously due to the backup system that emission analyzer need of work is more, limits the use occasion of this technology.In addition, existing diesel engine adopts advanced combustion system, in exhaust emissions, HC/CO gas concentration is very low, be only tens ppm orders of magnitude, be subject to the impact such as engine surge, emission analyzer testing progress, thus experimental test catalytic conversion efficiency repeatability and precision poor (in traditional TWC performance evaluation, gas discharging substrate concentration is generally several thousand ppm orders of magnitude).In addition, diesel engine DOC is all not identical with principle with the working environment of gasoline engine TWC, adopts TWC performance evaluation apparatus and method for evaluate DOC performance and does not have stronger cogency.
Summary of the invention
The present invention is intended at least one of solve the problems of the technologies described above.
For this reason, one object of the present invention is the performance test methods proposing a kind of diesel oxidation converter DOC.The method can test out the performance of oxidation catalytic converter DOC simply, accurately, objectively.
Another object of the present invention is to the Performance Test System proposing a kind of diesel oxidation converter DOC.
To achieve these goals, the embodiment of first aspect present invention proposes the performance test methods of a kind of diesel oxidation converter DOC, comprises the following steps: in adjustment engine discharging tail gas, the concentration of hydrocarbon is to preset concentration; The tail gas being adjusted to described preset concentration is passed into described DOC to carry out catalyzed conversion by described DOC to described tail hydrocarbon in gas and carbon monoxide; Measure the temperature in of described tail gas by DOC described during described DOC and the outlet temperature of described DOC; Described DOC catalyzed conversion characteristic to described tail hydrocarbon in gas and carbon monoxide under current intake air temperature is obtained according to the outlet temperature of described DOC and the temperature difference of described temperature in.
According to the method for testing of the diesel oxidation converter DOC of the embodiment of the present invention, the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission is regulated by air/fuel atomizer etc., improve the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission, ensure that the test of DOC to the catalytic conversion efficiency of the gases such as hydrocarbon is more accurate, and on this basis, the temperature of the tail gas that only need monitor the exhaust temperature before entering DOC and discharged by DOC, DOC is obtained at the catalytic conversion efficiency to tail hydrocarbon in gas and carbon monoxide according to temperature difference association between the two.Namely the relation between the intake air temperature of the tail gas of input DOC and the above-mentioned temperature difference is utilized, just the catalyzed conversion characteristic of DOC with the intake air temperature of the tail gas of entrance can be embodied, namely the temperature characteristic between the tail gas before and after DOC shows its initiation temperature characteristic, thus objective ground reflects the performance of DOC.
In addition, the performance test methods of diesel oxidation converter DOC according to the above embodiment of the present invention can also have following additional technical characteristic:
In some instances, the concentration of described hydrocarbon in adjustment engine discharging tail gas is to before preset concentration, also comprise: the running status adjusting described engine to change the temperature of the tail gas of described engine discharge, to obtain described DOC catalyzed conversion characteristic to described tail hydrocarbon in gas and carbon monoxide at various inlet temperature.
In some instances, described when the tail gas being adjusted to described preset concentration is passed into described DOC, also comprise: the constant flow controlling to pass into the tail gas of described DOC.Thus, objectivity and the accuracy of DOC the performance test results can be ensured further.
The embodiment of second aspect present invention provides the Performance Test System of a kind of diesel oxidation converter DOC, comprising: concentration regulator, for regulating the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission; The entrance of oxidation catalytic converter DOC, described DOC is connected with described engine exhaust emission pipeline; Temperature measuring equipment, described temperature measuring equipment is for measuring the temperature in of described tail gas by DOC described during described DOC and the outlet temperature of described DOC; Test subsystems, for obtaining described DOC catalyzed conversion characteristic to described tail hydrocarbon in gas and carbon monoxide under current intake air temperature according to the temperature difference of the outlet temperature of described DOC and the temperature in of described DOC.
According to the Performance Test System of the diesel oxidation converter DOC of the embodiment of the present invention, by the concentration of the ducted tail hydrocarbon in gas of adjustment engine exhaust emission, improve the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission, ensure that the test of DOC to the catalytic conversion efficiency of the gases such as hydrocarbon is more accurate, and on this basis, the temperature of the tail gas that only need monitor the exhaust temperature before entering DOC and discharged by DOC, DOC catalytic conversion efficiency to tail hydrocarbon in gas and carbon monoxide under current intake air temperature is obtained according to the temperature difference between the two.Namely the relation between the intake air temperature of the tail gas of input DOC and the above-mentioned temperature difference is utilized, just the catalyzed conversion characteristic of DOC with the intake air temperature of the tail gas of entrance can be embodied, namely the temperature characteristic between the tail gas before and after DOC shows its initiation temperature characteristic, thus objective ground reflects the performance of DOC.
In addition, the Performance Test System of diesel oxidation converter DOC according to the above embodiment of the present invention can also have following additional technical characteristic:
In some instances, described concentration regulator comprises: air/fuel atomizer, described air/fuel atomizer has nozzle, air leading-in conduit and fuel oil ingress pipe, obtain air/fuel combination gas for mixing fuel oil and pressurized air, being atomized, and by described nozzle, the combination gas of described air/is then sprayed in described engine exhaust emission pipe; Pressure air source, described pressure air source is connected with the air leading-in conduit of described air/fuel atomizer and thinks that described air/fuel atomizer provides described pressurized air; Pressurized fuel tank, described pressurized fuel tank is connected by the fuel oil ingress pipe of variable valve with described air/fuel atomizer, thinks that described air/fuel atomizer provides described fuel oil.
In some instances, described temperature measuring equipment comprises the first temperature measuring equipment and the second temperature measuring equipment, described first temperature measuring equipment is arranged on the entrance of described DOC, to detect the temperature in of described DOC, described second temperature measuring equipment is arranged on the outlet of described DOC, to detect the outlet temperature of described DOC.Thus, exhaust analyzer of the prior art can be replaced.
In some instances, described first temperature measuring equipment and described second temperature measuring equipment are temperature sensor, thus, can replace exhaust analyzer of the prior art.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the process flow diagram of the performance test methods of diesel oxidation converter DOC according to an embodiment of the invention;
Fig. 2 is the process flow diagram of the performance test methods of diesel oxidation converter DOC in accordance with another embodiment of the present invention;
Fig. 3 is the oxidation catalytic converter DOC of performance test methods of the diesel oxidation converter DOC of the application one embodiment of the invention schematic diagram to the catalytic conversion efficiency of tail hydrocarbon in gas and carbon monoxide at multiple various inlet temperature;
Fig. 4 is the structured flowchart of the Performance Test System of diesel oxidation converter DOC according to an embodiment of the invention;
Fig. 5 is the schematic diagram of the Performance Test System of diesel oxidation converter DOC according to an embodiment of the invention; And
Fig. 6 is the schematic diagram of the Performance Test System of existing a kind of oxidation catalytic converter DOC.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Below in conjunction with accompanying drawing description according to the method for testing of the oxidation catalytic converter DOC of the embodiment of the present invention and system.
Fig. 1 is the process flow diagram of the performance test methods of diesel oxidation converter DOC according to an embodiment of the invention.As shown in Figure 1, the performance test methods of diesel oxidation converter DOC, comprises the steps: according to an embodiment of the invention
Step S101: in adjustment engine discharging tail gas, the concentration of hydrocarbon is to preset concentration.
Such as: mix by the fuel oil of scheduled volume and by the pressurized air of scheduled volume by air/fuel atomizer, be atomized after spray in engine exhaust emission pipeline, like this, fuel oil after atomization and pressurized air form uniform combination gas in engine exhaust emission pipeline, thus before motor exhaust is introduced oxidation catalytic converter DOC, make the combination gass such as the hydrocarbon containing higher concentration in the ducted motor exhaust of engine exhaust emission, thus realize controlling the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission.
Wherein, preset concentration can rule of thumb be determined.Such as diesel motor, the gas concentrations such as the hydrocarbon contained in the tail gas of current diesel engine emissions and carbon monoxide (HC/CO) are lower, are generally only the gas concentration of tens ppm orders of magnitude.Therefore, by the way, gas concentration can be adjusted to the gas concentration of such as several thousand ppm orders of magnitude, like this, follow-up accuracy of DOC being carried out to performance test can be improved.
Step S102: the tail gas being adjusted to above-mentioned preset concentration is passed into DOC to carry out catalyzed conversion by DOC to tail hydrocarbon in gas and carbon monoxide.Such as: the entrance of tail gas by oxidation catalytic converter DOC can be passed into DOC.
Step S103: measure tail gas by the temperature in of DOC during DOC and the outlet temperature of DOC.
Wherein, when the temperature in of DOC refers to that tail gas enters DOC, the exhaust temperature at DOC inlet place, when the outlet temperature of DOC refers to that tail gas is discharged from DOC, the exhaust temperature in the exit of DOC.The intake air temperature that namely temperature in of DOC inputs the tail gas of DOC is designated as T
in, namely the outlet temperature of DOC is designated as T from the air outlet temperature of the tail gas of DOC output
out.Detect intake air temperature T
inwith air outlet temperature T
outdetection mode a lot, such as, by the entrance and exit position set temperature measurement mechanism at DOC, thus the temperature of the tail gas of the entrance and exit position of DOC detected by temperature measuring equipment.In this example, temperature measuring equipment is but is not limited to temperature sensor.
Step S104: obtain DOC catalyzed conversion characteristic to tail hydrocarbon in gas and carbon monoxide under current intake air temperature according to the outlet temperature of DOC and the temperature difference of temperature in.Namely the air outlet temperature of DOC associates with the temperature difference of intake air temperature and obtains DOC catalytic conversion efficiency to tail hydrocarbon in gas and carbon monoxide under current intake air temperature.Wherein, current intake air temperature refers to the temperature in of current DOC, the namely current temperature passing into the tail gas of DOC inlet.
Particularly, from the air outlet temperature T of the tail gas of DOC output
outwith the intake air temperature T of the tail gas of input DOC
inthe temperature difference be designated as DT, then DT=T
out-T
in.Wherein, the temperature difference DT(of oxidation catalytic converter DOC front and back end is namely from the air outlet temperature T of the tail gas of DOC output
outwith the intake air temperature T of the tail gas of input DOC
intemperature difference DT) embody DOC inside and oxidation reaction occurs cause the effect of heat release.By the intake air temperature T of the tail gas of input DOC
incarry out associating and normalized with temperature difference DT, just can embody the intake air temperature T of DOC with the tail gas of entrance
incatalyzed conversion characteristic, the temperature characteristic between the tail gas namely before and after DOC shows its initiation temperature characteristic.
According to the performance test methods of the diesel oxidation converter DOC of the embodiment of the present invention, by regulating the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission, improve the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission, ensure that the test of DOC to the catalytic conversion efficiency of the gases such as hydrocarbon is more accurate, and on this basis, the temperature of the tail gas that only need monitor the exhaust temperature before entering DOC and discharged by DOC, DOC catalytic conversion efficiency to tail hydrocarbon in gas and carbon monoxide under current intake air temperature is obtained according to the temperature difference between the two.Namely the relation between the intake air temperature of the tail gas of input DOC and the above-mentioned temperature difference is utilized, just the catalyzed conversion characteristic of DOC with the intake air temperature of the tail gas of entrance can be embodied, namely the temperature characteristic between the tail gas before and after DOC shows its initiation temperature characteristic, thus objective ground reflects the performance of DOC.
According to the above embodiments, the method of the application embodiment of the present invention, the temperature (DOC outlet temperature) of tail gas that only need monitor the exhaust temperature before entering DOC (DOC inlet temperature) and be discharged by DOC, just can test out the catalyzed conversion characteristic of DOC with the intake air temperature of the tail gas of entrance simply, effectively, objectively, the temperature characteristic between the tail gas namely before and after DOC shows its initiation temperature characteristic.Therefore, the method has the wide advantage of usable range.Such as, the method for the application embodiment of the present invention, when needing to test DOC for catalyzed conversion characteristic to tail gas during different intake air temperature, the temperature that only need change the tail gas entering DOC just can realize.
Such as: the concentration of this method of testing hydrocarbon in adjustment engine discharging tail gas is to before preset concentration, also can comprise: change the running status of engine to change the temperature of the tail gas of engine discharge, to obtain DOC catalytic conversion efficiency to tail hydrocarbon in gas and carbon monoxide at various inlet temperature, namely by under different intake air temperature, measure the outlet temperature of DOC that obtains and the temperature difference of temperature in and obtain DOC catalyzed conversion characteristic to tail hydrocarbon in gas and carbon monoxide at various inlet temperature (i.e. different temperature in).
Specifically, shown in composition graphs 2, the method for testing of diesel oxidation converter DOC, comprises the steps: in accordance with another embodiment of the present invention
Step S201: the running status that adjustment is started is to change the temperature that engine is disposed to the tail gas in exhaust emission pipeline.
As a concrete example, by adjusting the operating mode of engine, such as, increase the distributive value to engine, thus change the temperature of the tail gas of engine discharge.Like this, can, to the inlet air temperature set ceiling temperature entering DOC, like this, by changing engine operating condition, the intake air temperature entering DOC be grown steadily to this ceiling temperature.
Step S202: the concentration of the tail hydrocarbon in gas in adjustment engine discharging tail gas is to preset concentration.
Such as: will spray in engine exhaust emission pipeline after the mixing of the pressurized air of the fuel oil of scheduled volume and scheduled volume, atomization by air/fuel atomizer, namely the fuel oil after atomization and pressurized air form uniform combination gas in engine exhaust emission pipeline, thus before motor exhaust is introduced oxidation catalytic converter DOC, make the combination gass such as the hydrocarbon containing higher concentration in the ducted motor exhaust of engine exhaust emission, thus realize controlling the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission.
Wherein, preset concentration can rule of thumb be determined.Such as diesel motor, the gas concentrations such as the hydrocarbon contained in the tail gas of current diesel engine emissions and carbon monoxide (HC/CO) are lower, are generally only the gas concentration of tens ppm orders of magnitude.Therefore, by the way, gas concentration can be adjusted to the gas concentration of such as several thousand ppm orders of magnitude.
Step S203: the tail gas being adjusted to described preset concentration is passed into DOC to carry out catalyzed conversion by DOC to tail hydrocarbon in gas and carbon monoxide.Such as: import tail gas into DOC by the entrance of oxidation catalytic converter DOC.It should be noted that, when tail gas input DOC concentration adjustment completed, the step that the flow of the tail gas of control inputs DOC is constant can be comprised.
Step S204: measure tail gas by the temperature in of DOC during DOC and the outlet temperature of DOC.
Wherein, when the temperature in of DOC refers to that tail gas passes into the entrance of DOC, the temperature of tail gas, when the outlet temperature of DOC refers to be expelled to outlet by DOC, the temperature of tail gas.The intake air temperature that namely temperature in of DOC inputs the tail gas of DOC is designated as T
in, namely the outlet temperature of DOC is designated as T from the air outlet temperature of the tail gas of DOC output
out.Detect intake air temperature T
inwith air outlet temperature T
outdetection mode a lot, such as, by the entrance and exit position set temperature measurement mechanism at DOC, thus the temperature of the tail gas of the entrance and exit position of DOC detected by temperature measuring equipment.In this example, temperature measuring equipment is but is not limited to temperature sensor.
Step S205: obtain DOC catalyzed conversion characteristic to tail hydrocarbon in gas and carbon monoxide under various inlet temperature according to the temperature difference of exhaust temperature (temperature in) of the tail gas of the temperature (outlet temperature) of tail gas exported from DOC at various inlet temperature and the input DOC of correspondence.
Particularly, from the air outlet temperature T of the tail gas of DOC output
outwith the intake air temperature T of the tail gas of input DOC
inthe temperature difference be designated as DT, then DT=T
out-T
in.Wherein, the temperature difference DT(of oxidation catalytic converter DOC front and back end is namely from the air outlet temperature T of the tail gas of DOC output
outwith the intake air temperature T of the tail gas of input DOC
intemperature difference DT) embody DOC inside and oxidation reaction occurs cause the effect of heat release.By the intake air temperature T of the tail gas of input DOC
incarry out associating and normalized with temperature difference DT, just can embody the intake air temperature T of DOC with the tail gas of entrance
incatalyzed conversion characteristic, the temperature characteristic between the tail gas namely before and after DOC shows its initiation temperature characteristic.
As shown in Figure 3, horizontal ordinate shows intake air temperature (i.e. temperature in) when being increased to 300 degrees Celsius gradually from 150 degrees Celsius, temperature difference DT after the normalization of corresponding ordinate, as seen from Figure 3, the temperature difference DT of oxidation catalytic converter DOC front and back end reflects the effect that generation oxidation reaction in DOC inside causes heat release.Namely the intake air temperature T of DOC with the tail gas of entrance is embodied
incatalyzed conversion characteristic, the temperature characteristic between the tail gas namely before and after DOC shows its initiation temperature characteristic.
According to the performance test methods of the diesel oxidation converter DOC of the embodiment of the present invention, by regulating the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission, improve the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission, ensure that the test of DOC to the catalytic conversion efficiency of the gases such as hydrocarbon is more accurate, and on this basis, the temperature of the tail gas that only need monitor the exhaust temperature before entering DOC and discharged by DOC, DOC catalytic conversion efficiency to tail hydrocarbon in gas and carbon monoxide under current intake air temperature is obtained according to the temperature difference between the two.Namely the relation between the intake air temperature of the tail gas of input DOC and the above-mentioned temperature difference is utilized, just the catalyzed conversion characteristic of DOC with the intake air temperature of the tail gas of entrance can be embodied, namely the temperature characteristic between the tail gas before and after DOC shows its initiation temperature characteristic, thus objective ground reflects the performance of DOC.
As shown in Figure 4, further embodiment of the present invention provides the Performance Test System 400 of a kind of oxidation catalytic converter DOC, comprising: concentration regulator 410, oxidation catalytic converter 420(DOC), temperature measuring equipment 430 and test subsystems 440.
As shown in Figure 4 and Figure 5, concentration regulator 410 is for regulating the concentration of the tail hydrocarbon in gas in engine exhaust emission pipeline 500.Oxidation catalytic converter 420(DOC) entrance be connected with engine exhaust emission pipeline 500.Temperature measuring equipment 430 is for measuring the temperature in of tail gas by DOC during DOC and the outlet temperature of DOC, namely for detecting input oxidation catalytic converter 420(DOC) the intake air temperature of tail gas and the air outlet temperature of tail gas that exports from oxidation catalytic converter 420, replace existing exhaust analyzer.Test subsystems 440, for obtaining DOC catalyzed conversion characteristic to tail hydrocarbon in gas and carbon monoxide under current intake air temperature according to the temperature difference of the outlet temperature of DOC and the temperature in of DOC, namely obtains oxidation catalytic converter 420(DOC according to the temperature difference of air outlet temperature and intake air temperature) under current intake air temperature to the catalytic conversion efficiency of tail hydrocarbon in gas and carbon monoxide.
Composition graphs 5, in one embodiment of the invention, concentration regulator 410 comprises: air/fuel atomizer 411, pressure air source 412 and pressurized fuel tank 413.
Wherein, air/fuel atomizer 411 has nozzle P, air leading-in conduit A and fuel oil ingress pipe F, air/fuel atomizer 411 obtains air/fuel combination gas for mixing fuel oil and pressurized air, being atomized, and is sprayed in engine exhaust emission pipeline 500 by the combination gas of air/then by nozzle P.Pressure air source 412 is connected with the air leading-in conduit A of air/fuel atomizer 411 and thinks that air/fuel atomizer 411 provides pressurized air.Pressurized fuel tank 413 is connected with the fuel oil ingress pipe F of air/fuel atomizer 411 by variable valve 414, thinks that air/fuel atomizer 411 provides fuel oil.
Specifically, concentration regulator 410 regulates the concentration of the tail hydrocarbon in gas in engine exhaust emission pipeline 500 to preset concentration.Such as: mix by the pressurized air of above-mentioned air/fuel atomizer 411 by the fuel oil of scheduled volume and scheduled volume, spray in engine exhaust emission pipeline 500 after atomization, namely the fuel oil after atomization and pressurized air form uniform combination gas in engine exhaust emission pipeline 500, thus motor exhaust is being introduced oxidation catalytic converter 420(DOC) before, make the combination gass such as the hydrocarbon containing higher concentration in the motor exhaust in engine exhaust emission pipeline 500, thus realize controlling the concentration of the tail hydrocarbon in gas in engine exhaust emission pipeline 500.
Wherein, preset concentration can rule of thumb be determined.Such as diesel motor, the gas concentrations such as the hydrocarbon contained in the tail gas of current diesel engine emissions and carbon monoxide (HC/CO) are lower, are generally only the gas concentration of tens ppm orders of magnitude.Therefore, by the way, gas concentration can be adjusted to the gas concentration of such as several thousand ppm orders of magnitude.
As shown in Figure 5, in one embodiment of the invention, temperature measuring equipment 430 comprises the first temperature measuring equipment 431 and the second temperature measuring equipment 432.First temperature measuring equipment 431 is arranged on oxidation catalytic converter 420(DOC) entrance, to detect oxidation catalytic converter 420(DOC) temperature in, second temperature measuring equipment 432 is arranged on oxidation catalytic converter 420(DOC) outlet, to detect oxidation catalytic converter 420(DOC) outlet temperature.Wherein, the first temperature measuring equipment 431 and the second temperature measuring equipment 432 are but are not limited to temperature sensor.Wherein, the intake air temperature inputting the tail gas of DOC is designated as T
in, be designated as T from the air outlet temperature of the tail gas of DOC output
out.
That is, intake air temperature T is detected
inwith air outlet temperature T
outdetection mode a lot, by aforesaid way, namely at oxidation catalytic converter 420(DOC) entrance and exit position set temperature measurement mechanism 430, thus oxidation catalytic converter 420(DOC detected by temperature measuring equipment 430) the temperature of tail gas of entrance and exit position.Certainly, in other example of the present invention, also detect oxidation catalytic converter 420(DOC by alternate manner) the gas temperature of entrance and exit position.
In one embodiment of the invention, test subsystems 440 can obtain DOC catalytic conversion efficiency to tail hydrocarbon in gas and carbon monoxide under current intake air temperature according to the temperature difference of air outlet temperature and intake air temperature.Specifically comprise: from the air outlet temperature T of the tail gas that DOC exports
outwith the intake air temperature T of the tail gas of input DOC
inthe temperature difference be designated as DT, then DT=T
out-T
in.Wherein, the temperature difference DT(of DOC front and back end is namely from the air outlet temperature T of the tail gas of DOC output
outwith the intake air temperature T of the tail gas of input DOC
intemperature difference DT) embody DOC inside and oxidation reaction occurs cause the effect of heat release.By the intake air temperature T of the tail gas of input DOC
incarry out associating and normalized with temperature difference DT, just can embody the intake air temperature T of DOC with the tail gas of entrance
incatalyzed conversion characteristic, the temperature characteristic between the tail gas namely before and after DOC shows its initiation temperature characteristic.
According to the Performance Test System of the diesel oxidation converter DOC of the embodiment of the present invention, by regulating the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission, improve the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission, ensure that the test of DOC to the catalytic conversion efficiency of the gases such as hydrocarbon is more accurate, and on this basis, the temperature of the tail gas that only need monitor the exhaust temperature before entering DOC and discharged by DOC, DOC catalytic conversion efficiency to tail hydrocarbon in gas and carbon monoxide under current intake air temperature is obtained according to the temperature difference between the two.Namely the relation between the intake air temperature of the tail gas of input DOC and the above-mentioned temperature difference is utilized, just the catalyzed conversion characteristic of DOC with the intake air temperature of the tail gas of entrance can be embodied, namely the temperature characteristic between the tail gas before and after DOC shows its initiation temperature characteristic, thus objective ground reflects the performance of DOC.
According to the above embodiments, the system of the application embodiment of the present invention, the temperature of the tail gas that only need monitor the exhaust temperature before entering DOC and discharged by DOC, just can test out the catalyzed conversion characteristic of DOC with the intake air temperature of the tail gas of entrance simply, effectively, objectively, the temperature characteristic between the tail gas namely before and after DOC shows its initiation temperature characteristic.Therefore, this system has the wide advantage of usable range.Such as, the system of the application embodiment of the present invention, when needing to test DOC for catalyzed conversion characteristic to tail gas during different intake air temperature, the temperature that only need change the tail gas entering DOC just can realize.
Specifically, such as, adjusting the operating mode of engine, as increased the distributive value to engine, thus changing the temperature of the tail gas of engine discharge.Like this, can, to the inlet air temperature set ceiling temperature entering DOC, like this, by changing engine operating condition, the intake air temperature entering DOC be grown steadily to this ceiling temperature.It should be noted that, when adjusting the operating mode of engine, in needing, keeping the extraction flow flowing through DOC constant.Therefore, can make the result of DOC performance test more objective and accurate.
Like this, DOC intake air temperature T is measured by the first temperature measuring equipment 431 and the second temperature measuring equipment 432
inwith air outlet temperature T
out.Wherein, the effect of DOC is the chemical reaction of catalysis such as hydrocarbon and carbon monoxide (HC/CO) and oxygen, thus removing noxious emission, release heat simultaneously.Along with intake air temperature T
inprogressively rising, air outlet temperature T
outthere is obvious difference, until reach a new balance.At this, before and after definition, temperature difference DT is: DT=T
out-T
in.Thus, the temperature difference DT of DOC front and back end embodies the effect that generation oxidation reaction in DOC inside causes heat release.By the intake air temperature T of the tail gas of input DOC
incarry out associating and normalized with temperature difference DT, just can embody the intake air temperature T of DOC with the tail gas of entrance
incatalyzed conversion characteristic, the temperature characteristic between the tail gas namely before and after DOC shows its initiation temperature characteristic.
According to the Performance Test System of the diesel oxidation converter DOC of the embodiment of the present invention, effectively can ensure that the test of DOC to the catalytic conversion efficiency of the gases such as hydrocarbon is more accurate, and only need to obtain DOC catalytic conversion efficiency to tail hydrocarbon in gas and carbon monoxide under current intake air temperature according to the exhaust temperature before entering DOC and the temperature difference of the temperature of tail gas of being discharged by DOC, thus embody the catalyzed conversion characteristic of DOC with the intake air temperature of the tail gas of entrance, namely the temperature characteristic between the tail gas before and after DOC shows its initiation temperature characteristic, thus objective ground reflects the performance of DOC.In addition, this test macro has the advantage that structure is simple, cost is low.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalency thereof.
Claims (7)
1. a performance test methods of diesel oxidation converter DOC, is characterized in that, comprises the following steps:
In adjustment engine discharging tail gas, the concentration of hydrocarbon is to preset concentration;
The tail gas being adjusted to described preset concentration is passed into described DOC to carry out catalyzed conversion by described DOC to described tail hydrocarbon in gas and carbon monoxide;
Measure the temperature in of described tail gas by DOC described during described DOC and the outlet temperature of described DOC;
Described DOC catalyzed conversion characteristic to described tail hydrocarbon in gas and carbon monoxide under current intake air temperature is obtained according to the outlet temperature of described DOC and the temperature difference of described temperature in.
2. method of testing according to claim 1, is characterized in that, the concentration of described hydrocarbon in adjustment engine discharging tail gas, to before preset concentration, also comprises:
The running status adjusting described engine to change the temperature of the tail gas of described engine discharge, to obtain described DOC catalyzed conversion characteristic to described tail hydrocarbon in gas and carbon monoxide at various inlet temperature.
3. method of testing according to claim 1 and 2, is characterized in that, described when the tail gas being adjusted to described preset concentration is passed into described DOC, also comprises: control the constant flow passing into the tail gas of described DOC.
4. a Performance Test System of diesel oxidation converter DOC, is characterized in that, comprising:
Concentration regulator, for regulating the concentration of the ducted tail hydrocarbon in gas of engine exhaust emission;
The entrance of oxidation catalytic converter DOC, described DOC is connected with described engine exhaust emission pipeline;
Temperature measuring equipment, described temperature measuring equipment is for measuring the temperature in of described tail gas by DOC described during described DOC and the outlet temperature of described DOC;
Test subsystems, for obtaining described DOC catalyzed conversion characteristic to described tail hydrocarbon in gas and carbon monoxide under current intake air temperature according to the temperature difference of the outlet temperature of described DOC and the temperature in of described DOC.
5. test macro according to claim 4, is characterized in that, described concentration regulator comprises:
Air/fuel atomizer, described air/fuel atomizer has nozzle, air leading-in conduit and fuel oil ingress pipe, obtain air/fuel combination gas for mixing fuel oil and pressurized air, being atomized, and by described nozzle, the combination gas of described air/is then sprayed in described engine exhaust emission pipe;
Pressure air source, described pressure air source is connected with the air leading-in conduit of described air/fuel atomizer and thinks that described air/fuel atomizer provides described pressurized air;
Pressurized fuel tank, described pressurized fuel tank is connected by the fuel oil ingress pipe of variable valve with described air/fuel atomizer, thinks that described air/fuel atomizer provides described fuel oil.
6. the test macro according to claim 4 or 5, it is characterized in that, described temperature measuring equipment comprises the first temperature measuring equipment and the second temperature measuring equipment, described first temperature measuring equipment is arranged on the entrance of described DOC, to detect the temperature in of described DOC, described second temperature measuring equipment is arranged on the outlet of described DOC, to detect the outlet temperature of described DOC.
7. test macro according to claim 6, is characterized in that, described first temperature measuring equipment and described second temperature measuring equipment are temperature sensor.
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