CN209945739U - Diesel engine tail gas particulate matter produces system - Google Patents
Diesel engine tail gas particulate matter produces system Download PDFInfo
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- CN209945739U CN209945739U CN201920878221.7U CN201920878221U CN209945739U CN 209945739 U CN209945739 U CN 209945739U CN 201920878221 U CN201920878221 U CN 201920878221U CN 209945739 U CN209945739 U CN 209945739U
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Abstract
The utility model provides a diesel engine tail gas particulate matter produces system, include: a diesel generator having an air intake line and an exhaust line; the fuel injection timing adjusting module is connected with the diesel generator and is used for adjusting the fuel injection timing of the diesel generator; the air inlet adjusting module is connected with the air inlet pipeline and used for adjusting air inlet of the diesel generator; the exhaust adjusting module is connected with the exhaust pipeline and used for adjusting the exhaust of the diesel generator; and the load adjusting module is connected with the diesel generator and is used for adjusting the load of the diesel generator. The diesel engine exhaust particulate matter generating system can completely simulate the real working environment of a target diesel engine so as to ensure that the exhaust components of the exhaust and the exhaust particulate matter particle size distribution of the exhaust are consistent, and the evaluation accuracy is improved; compare in real vehicle aassessment, the utility model discloses can show and reduce the aassessment cost.
Description
Technical Field
The utility model relates to a diesel engine field especially relates to a diesel engine tail gas particulate matter produces system.
Background
The engine for various non-road mobile diesel engines including vehicles, ships, agricultural machinery, engineering machinery and port machinery plays a significant role in the development of national economy. However, the working principle of direct injection and compression ignition of the diesel engine leads to that various vehicles and ships using the diesel engine as power provide strong power and simultaneously discharge a large amount of various pollutants including particles, thereby exacerbating the urban air quality pollution of China and seriously harming the health of the nation.
In recent years, with three technological leaps of diesel engines, the implementation of measures such as the maturity of turbocharging technology, in-cylinder direct injection technology and electronic control high-pressure common rail technology, the continuous improvement of fuel quality and the like continuously reduces the emission of diesel engine particles in China. However, with the increasing strictness of the emission standard, such as the PM2.5 standard, and the addition of limit requirements for PN (Particulate matter index), the emission standard needs to be continuously improved only by adding a Diesel Particulate Filter (Diesel Particulate Filter) and other post-treatment devices to the Diesel engine.
Generally, before a diesel vehicle exhaust purification device of one type is put into large-scale production, a manufacturer can evaluate the emission reduction effect and durability of particulate matter quantity PM and particulate matter quantity PN on a small sample, and design and production of formal products can be carried out only after the evaluation is qualified. Meanwhile, a piece of the diesel vehicle exhaust purification device to be detected is cut out for testing in order to evaluate the emission reduction performance of the diesel vehicle exhaust purification device.
In order to test the particulate matter emission reduction effect of a small sample of the diesel vehicle exhaust purification device, a corresponding evaluation test can be carried out only by the simulated gas containing the particulate matter. However, there is no effective device for generating simulated exhaust gas required for evaluation, and existing evaluation test methods include a real-time test method and a method for generating simulated exhaust gas containing particulate matter by burning diesel oil using a boiler burner, but both methods have serious drawbacks. For example, the cost required by the adoption of a real vehicle test is too high; in the method adopting the boiler burner, due to the difference of the combustion mode, the combustion temperature, the combustion pressure and the like of the boiler burner, the tail gas generated by adopting the method and the actual exhaust tail gas of the diesel engine have larger difference in the aspects of components, particle size distribution of particles and the like, so that accurate evaluation cannot be performed.
SUMMERY OF THE UTILITY MODEL
In view of the above prior art's shortcoming, the utility model aims to provide a diesel engine exhaust particulate matter produces system for solve among the prior art the aassessment that exists when aassessment diesel vehicle exhaust purifier's particulate matter reduces discharging effect with high costs, and/or aassessment inaccurate scheduling problem.
In order to achieve the above objects and other related objects, the utility model provides a diesel engine exhaust particulate matter produces system, include: a diesel generator having an air intake line and an exhaust line; the fuel injection timing adjusting module is connected with the diesel generator and used for adjusting the fuel injection timing of the diesel generator, and the fuel injection timing adjusting module is provided with a plurality of adjusting grades; the air inlet adjusting module is connected with the air inlet pipeline and used for adjusting air inlet of the diesel generator; the exhaust adjusting module is connected with the exhaust pipeline and used for adjusting the exhaust of the diesel generator; and the load adjusting module is connected with the diesel generator and is used for adjusting the load of the diesel generator.
Optionally, the power of the diesel generator is 3-10 kW, and the oil injection timing adjusting module has 5 adjusting levels of-20 CA, -15CA, -10CA, -5CA, 0CA and the like.
Optionally, the intake adjusting module includes an oxygen supply unit, a first inert gas supply unit, and a first air pressure adjusting unit, and the oxygen supply unit, the first inert gas supply unit, and the first air pressure adjusting unit are all connected to the intake pipeline; the oxygen supply unit is used for supplying oxygen into the air inlet pipeline; the first inert gas supply unit is used for supplying inert gas into the air inlet pipeline according to the requirement so as to change the oxygen content in the air inlet pipeline; the first air pressure adjusting unit is used for adjusting the air pressure in the air inlet pipeline according to the requirement so that the air inlet pressure of the air inlet pipeline can ensure that the diesel generator operates within the design range.
Optionally, the oxygen supply unit comprises a first oxygen sensor for detecting the oxygen content in the intake line and an oxygen control valve for regulating the oxygen content in the intake line; the first inert gas supply unit comprises a first inert gas pipeline and a first inert gas control valve, the first inert gas pipeline is communicated with the air inlet pipeline, and the first inert gas control valve is used for adjusting the supply amount of the first inert gas so as to change the oxygen content in the air inlet pipeline; the first pressure regulating unit includes a first pressure sensor for detecting a gas pressure in the intake pipe, and a first pressure control valve for regulating the gas pressure in the intake pipe.
Optionally, the oxygen supply unit may adjust the oxygen content in the intake line to 21%, 19%, 17%, 15% and 13% 5 steps.
Optionally, the exhaust gas adjusting module comprises a second inert gas supply unit and a second gas pressure adjusting unit; the second inert gas supply unit comprises a second inert gas pipeline and a second inert gas control valve, the second inert gas pipeline is communicated with the exhaust pipeline, and the second inert gas control valve is used for adjusting the supply amount of second inert gas so as to change the exhaust component ratio in the exhaust pipeline; the second air pressure adjusting unit includes a second pressure sensor for detecting a gas pressure in the exhaust line and a second pressure control valve for adjusting the gas pressure in the exhaust line to ensure that the diesel generator can normally operate.
Optionally, the exhaust adjustment module further includes a heating unit, the heating unit is connected to the second inert gas pipeline, the heating unit includes a heater and a temperature measuring instrument, the temperature measuring instrument is configured to measure a temperature of the second inert gas in the second inert gas pipeline, and the heater is configured to heat the second inert gas.
Optionally, the load adjusting module includes a plurality of relays and a plurality of load units connected to the plurality of relays in a one-to-one correspondence manner, and the load of the diesel generator is adjusted by connecting or disconnecting the relays.
Optionally, the load adjustment module may adjust the load of the diesel generator to 20%, 40% and 60%, 80%, 100% 5 gear.
Optionally, the diesel engine exhaust particulate matter generation system further comprises a central controller, and the central controller is connected with the air inlet adjusting module, the exhaust adjusting module and the load adjusting module.
As above, the utility model discloses a diesel engine exhaust particulate matter produces system has following beneficial effect: the utility model discloses a diesel engine exhaust particulate matter produces system can simulate target diesel engine's true operational environment completely in order to ensure that its exhaust tail gas and target diesel engine's the component and the tail gas particulate matter particle size distribution of exhaust tail gas are unanimous to reduce discharging the effect and provide the accuracy of truest situation in order to improve the aassessment for aassessment diesel vehicle exhaust gas purification device's particulate matter. In addition, the application can simulate the exhaust emission of diesel engines with various powers/models, and compared with real vehicle evaluation, the method for evaluating the exhaust generated by the diesel engine exhaust particle generating system can obviously reduce the evaluation cost.
Drawings
Fig. 1 shows a schematic block diagram of a diesel engine exhaust particulate generation system according to an embodiment of the present invention.
Fig. 2 shows a schematic structural diagram of a diesel engine exhaust particulate generation system according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of another module of a diesel exhaust particulate generation system according to a first embodiment of the present invention.
Fig. 4 is a flowchart of a diesel engine exhaust particulate simulation method according to an embodiment of the present invention.
Description of the element reference numerals
1 diesel generator
11 air inlet pipeline
12 exhaust pipeline
2 oil injection timing adjusting module
3 air inlet adjusting module
31 oxygen supply unit
311 first oxygen sensor
312 oxygen control valve
32 first inert gas supply unit
321 first inert gas pipeline
322 first inert gas control valve
33 first air pressure adjusting unit
331 first pressure sensor
332 first pressure control valve
4 exhaust gas regulating module
41 second inert gas supply unit
411 second inert gas line
412 second inert gas control valve
42 second air pressure adjusting unit
421 second pressure sensor
422 second pressure control valve
43 heating unit
431 heater
432 temperature measuring instrument
44 thermometer
45 second oxygen sensor
5 load adjusting module
51 Relay
52 load cell
61 inert gas source
62 air pump
7 central controller
S01-S03
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
Please refer to fig. 1 to 4. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the invention in a schematic manner, and only the components related to the invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of the components in actual implementation can be changed at will, and the layout of the components may be more complicated.
Example one
As shown in fig. 1, the utility model provides a diesel engine exhaust particulate matter produces system, include: a diesel generator 1, said diesel generator 1 having an intake line 11 and an exhaust line 12; the oil injection timing adjusting module 2 is connected with the diesel generator 1 and used for adjusting the oil injection timing of the diesel generator 1, and the oil injection timing adjusting module 2 is provided with a plurality of adjusting grades; the air inlet adjusting module 3 is connected with the air inlet pipeline 11 and used for adjusting air inlet of the diesel generator 1; the exhaust adjusting module 4 is connected with the exhaust pipeline 12 and used for adjusting the exhaust of the diesel generator 1; and the load adjusting module 5 is connected with the diesel generator 1 and is used for adjusting the load of the diesel generator 1. The utility model discloses a diesel engine exhaust particulate matter produces system can simulate target diesel engine's true operational environment completely in order to ensure that its exhaust tail gas and target diesel engine's the component and the tail gas particulate matter particle size distribution of exhaust tail gas are unanimous to reduce discharging the effect and provide the accuracy of truest situation in order to improve the aassessment for aassessment diesel vehicle exhaust gas purification device's particulate matter. In addition, the application can simulate the exhaust emission of the diesel engine with various powers, and compared with the real vehicle evaluation, the method for evaluating the exhaust generated by the diesel engine exhaust particle generating system can obviously reduce the evaluation cost.
Theoretically, the utility model discloses a diesel engine exhaust particulate matter produces system can simulate the exhaust emission of the diesel engine of any power, but if diesel generator 1's power is too little, then the exhaust difference of adjusting the parameter emission such as the air admission of diesel generator 1 and oil spout timing is not obvious, probably influences the aassessment effect; if the power of the diesel generator 1 is too large, the exhaust emission is too large, which may cause serious pollution and even harm to people. Of course, most importantly, the power range of the diesel generator 1 should at least cover the power of the target diesel vehicle/diesel engine (i.e. a vehicle driven by a diesel engine). The utility model discloses the people is through many times test analysis and experience the demonstration discovery, works as when diesel generator 1's power is 3 ~ 10kW, adopts the utility model discloses a tail gas that diesel engine tail gas particulate matter production system produced and the exhaust tail gas's of target diesel vehicle similarity can reach more than 95%, therefore can ensure the accuracy of aassessment.
The fuel injection timing adjusting module 2 is consistent with the fuel injection timing of the target diesel vehicle. In one example, the injection timing adjustment module 2 has 5 adjustment steps of-20 CA, -15CA, -10CA, -5CA, and 0 CA. The adjustment of the timing of the injection is carried out by varying the angle of advance of the injection, the adjustment of the timing of the injection being uniform, which facilitates the simplified adjustment of the timing of the injection of the diesel generator 1. Of course, in other examples, the adjustment level of the injection timing adjustment module 2 may be more than 5 or less than 5, and the adjustment manner may be non-uniform, and the present embodiment is not limited thereto.
Fig. 2 illustrates a specific schematic structural diagram of the diesel exhaust particulate generation system of the present invention.
As shown in fig. 2, the intake air adjusting module 3 includes, as an example, an oxygen supply unit 31, a first inert gas supply unit 32, and a first air pressure adjusting unit 33, and the oxygen supply unit 31, the first inert gas supply unit 32, and the first air pressure adjusting unit 33 are all connected to the intake pipe 11; the oxygen supply unit 31 is configured to supply oxygen into the intake pipe 11; the first inert gas supply unit 32 is configured to supply inert gas into the intake pipe 11 as needed to change the oxygen content in the intake pipe 11; the first air pressure adjusting unit 33 is used for adjusting the air pressure in the air inlet pipeline 11 according to the requirement so that the air inlet pressure of the air inlet pipeline 11 can ensure that the diesel generator 1 operates within the design range; the oxygen supply unit 31 generally comprises a line for connection of an oxygen-containing gas, more precisely a combustion gas, usually air.
As an example, the oxygen supply unit 31 includes a first oxygen sensor 311 for detecting the oxygen content in the intake pipe 11, and an oxygen control valve 312 for adjusting the oxygen content in the intake pipe 11; the first inert gas supply unit 32 includes a first inert gas pipe 321 and a first inert gas control valve 322, the first inert gas pipe 321 is communicated with the gas inlet pipe 11, the first inert gas control valve 322 is used for adjusting the supply amount of the first inert gas so as to change the oxygen content in the gas inlet pipe 11, the first inert gas pipe 321 can be connected to an inert gas source 61 such as nitrogen or argon which does not support combustion, and a gas pump 62 can be connected to the first inert gas pipe 321 to provide power; the first pressure adjusting unit 33 includes a first pressure sensor 331 for detecting the pressure of the gas in the intake pipe 11, and a first pressure control valve 332 for adjusting the pressure of the gas in the intake pipe 11. The first pressure sensor 331 may be connected to the first pressure control valve 332, and the first pressure sensor 331 may also be connected to the oxygen control valve 312 and/or the first inert gas control valve 322, so as to adjust one or more of the first pressure control valve 332, the oxygen control valve 312 and the first inert gas control valve 322 according to the gas pressure in the intake pipe 11 detected by the first pressure sensor 331 to ensure that the gas pressure in the intake pipe 11 is normal, thereby ensuring that the diesel generator 1 is operating normally within its design range. In other examples, the communication among the oxygen supply unit 31, the first inert gas supply unit 32, and the intake pipe 11 may be connected by a three-way valve without separately providing the oxygen control valve 312 and the first inert gas control valve 322, which is not strictly limited in this embodiment.
The oxygen supply unit 31 can flexibly adjust the oxygen content in the air inlet pipeline 11 according to the requirement, and different oxygen contents can change the intensity of fuel oil combustion in the diesel generator 1 to change the components of the exhaust gas, which is beneficial to further improving the accuracy of evaluating the particulate matter emission reduction effect of the diesel vehicle exhaust gas purification device. In one example, the oxygen supply unit 31 may adjust the oxygen content in the intake pipe 11 to 5 steps of 21%, 19%, 17%, 15%, 13%. Of course, in other examples, the oxygen content in the intake pipe 11 may be set to other ratios, and each ratio may not be arranged in an equal difference manner.
As an example, the degassing adjustment module 4 includes a second inert gas supply unit 41 and a second gas pressure adjustment unit 42; the second inert gas supply unit 41 includes a second inert gas line 411 and a second inert gas control valve 412, the second inert gas line 411 being in communication with the exhaust line 12, the second inert gas control valve 412 being configured to adjust a supply amount of a second inert gas to change an exhaust component ratio in the exhaust line 12; the second air pressure adjusting unit 42 includes a second pressure sensor 421 and a second pressure control valve 422, the second pressure sensor 421 is used for detecting the air pressure in the exhaust pipeline 12, and the second pressure control valve 422 is used for adjusting the air pressure in the exhaust pipeline 12 to ensure that the diesel generator 1 can work normally; the second inert gas pipe 411 can be connected to an inert gas source 61 such as nitrogen or argon which does not support combustion, and an air pump 62 can be connected to the second inert gas pipe 411 to provide power; the second pressure sensor 421 may be connected to the second pressure control valve 422, and the second pressure sensor 421 may also be connected to the second inert gas control valve 412, so as to adjust one or both of the second pressure control valve 422 and the second inert gas control valve 412 according to the gas pressure in the exhaust pipe 12 detected by the second pressure sensor 421 to ensure that the gas pressure in the exhaust pipe 12 is normal, thereby ensuring that the diesel generator 1 can normally operate. The exhaust adjusting module 4 may further include a second oxygen sensor 45, where the second oxygen sensor 45 is located on the exhaust pipe 12 and is used for detecting an oxygen content in the exhaust pipe 12, and the second oxygen sensor 45 may be connected to the second inert gas supply unit 41 and/or the second air pressure adjusting unit 42 to control the supply of the second inert gas and/or adjust the air pressure in the exhaust pipe 12 according to a detection result of the second oxygen sensor 45. The first inert gas supply unit 32 and the second inert gas supply unit 41 may be connected to the same or different inert gas sources 61, preferably to the same inert gas source for cost saving; the first oxygen sensor 311 and the second oxygen sensor 45 are preferably the same type; the types of the oxygen control valve 312, the first inert gas control valve 322, the first pressure control valve 332, the second inert gas control valve 412, and the second pressure control valve 422 may be the same or different; the first pressure sensor 331 and the second pressure sensor 421 are preferably the same type. A thermometer 44 may also be provided on the exhaust line 12 to measure the temperature of the exhaust gas in the exhaust line 12. It should be noted that the exhaust line 12 may be a single line structure, or may be a structure including a plurality of branch lines that are communicated with each other, and control valves may be respectively provided on the branch lines to adjust the pressure of the exhaust line 12 by opening or closing the control valves on the branch lines according to the total pressure of the exhaust line 12 detected by the second pressure sensor 421, which is not strictly limited in this embodiment.
As an example, the exhaust gas adjusting module 4 further includes a heating unit 43, the heating unit 43 is connected to the second inert gas pipeline 411, the heating unit 43 includes a heater 431 and a temperature measuring instrument 432, the temperature measuring instrument 432 is used for measuring the temperature of the second inert gas in the second inert gas pipeline 411, the heater 431 is used for heating the second inert gas to ensure that the temperature of the introduced second inert gas is consistent with the exhaust gas temperature and the condensation phenomenon is not generated, and the concentration of the particulate matters in the exhaust gas can be finely adjusted by changing the exhaust gas temperature and the dilution and mixing ratio of the inert gas. The heater 431 may be connected to the temperature measuring instrument 432 to start heating the second inert gas according to the measurement result of the temperature measuring instrument 432. The heater 431 may be disposed at the periphery of the second inert gas pipe 411, for example, to wrap the second inert gas pipe 411 to heat the second inert gas, or may be disposed in the second inert gas pipe 411, which may be determined according to the structure of the heater 431; the heater 431 may be a heating device containing a medium such as water or air, and the heater 431 is preferably located at the periphery of the second inert gas pipe 411; the heater 431 may also be a resistance heating device, and the heater 431 may be located at the periphery or inside of the second inert gas pipeline 411, which is not strictly limited in this embodiment. In the case where the heater 431 is provided, the gas pressure in the exhaust line 12 needs to be detected in real time to ensure that the gas pressure in the exhaust line 12 is normal.
The load regulation module 5 can regulate the load of the diesel generator 1 as required. In one example, the load adjusting module 5 includes a plurality of relays 51 and a plurality of load units 52 connected to the plurality of relays 51 in a one-to-one correspondence, and adjusts the load of the diesel generator 1 by connecting or disconnecting the relays 51; the power of a plurality of load units 52 is preferably completely identical, so that the power of the diesel generator 1 can be adjusted by adjusting the number of load units 52 connected; for example, if the load adjusting module 5 includes 5 relays 51 and 5 load units 52 connected to the 5 relays 51 in a one-to-one correspondence manner, the load of the diesel generator 1 can be adjusted to 5 steps of 20% (accessing one load unit 52), 40% (accessing two load units 52), 60% (accessing three load units 52), 80% (accessing four load units 52), and 100% (accessing five load units 52) by connecting or disconnecting the relays 51. Of course, in other examples, the adjustment level of the load adjustment module 5 may be more than one level, or the load adjustment module 5 may include a single load unit 52 with adjustable power, and the load of the diesel engine is adjusted by adjusting the power of the single load unit 52, which is not strictly limited in this embodiment. The load unit 52 may be an electro-optical device such as an electric lamp for converting electric energy into light energy, or an electric device such as an electric water heater for converting electric energy into heat energy, so as to reduce electric energy waste.
It should be noted that the connection sequence of the specific devices in each module is not limited to that shown in fig. 2, for example, in fig. 2, the second pressure sensor 421 is located at an end of the second oxygen sensor 45 away from the diesel generator 1, and actually, the positions of the two are interchangeable, and the specific arrangement of other modules can be flexibly adjusted according to needs, and is not expanded one by one.
Fig. 3 illustrates another schematic block diagram of the diesel exhaust particulate generation system of the present invention. As shown in fig. 3, as an example, the diesel exhaust particulate matter generating system further includes a central controller 7, the central controller 7 may be a computer or a single chip microcomputer, the central controller 7 is connected with the intake air adjusting module 3, the exhaust air adjusting module 4 and the load adjusting module 5, such as the first oxygen sensor 311, the first pressure sensor 331, the oxygen control valve 312, the first inert gas control valve 322 and the first pressure control valve 332 in the intake air adjusting module 3, and the second oxygen sensor 45, the second pressure sensor 421, the second pressure control valve 422, the second inert gas control valve 412 and the plurality of relays 51 in the exhaust air adjusting module 4 are all connected with the central controller 7, and the central controller 7 is connected with the first pressure control valve 7 according to the gas pressure in the intake pipeline 11 detected by the first pressure sensor 331 332. One or more of the oxygen control valve 312 and the first inert gas control valve 322 are adjusted to ensure that the gas pressure in the intake pipe 11 is normal, and one or both of the second pressure control valve 422 and the second inert gas control valve 412 are adjusted to ensure that the gas pressure in the exhaust pipe 12 is normal, based on the gas pressure in the exhaust pipe 12 detected by the second pressure sensor 421, and the connection or disconnection of the relay 51 is controlled as necessary to adjust the load of the diesel generator 1. It should be noted that, since the central controller 7 is usually a digital signal processing device, if analog signal processing devices are included in the intake air adjusting module 3, the exhaust air adjusting module 4 and the load adjusting module 5, for example, if the first pressure sensor 331 measures an analog signal generated, an analog-to-digital converter may be further provided between the first pressure sensor 331 and the central controller 7 to convert the analog signal of the detection result into a digital signal, or an analog-to-digital converter may be provided in each of the intake air adjusting module 3, the exhaust air adjusting module 4 and the load adjusting module 5, or two or more of the intake air adjusting module 3, the exhaust air adjusting module 4 and the load adjusting module 5 may be connected to the central controller 7 through the same analog-to-digital converter, or an analog-to-digital converter may be provided at the central controller 7, the present embodiment is not strictly limited. Of course, in other examples, the control can be performed manually by a worker, so the central controller 7 is not necessary, but the control accuracy and the work efficiency can be improved by using the central controller 7.
As an example, the diesel exhaust particulate generating system further comprises an exhaust gas treatment device (not shown) connected with the exhaust pipeline to treat the exhaust gas in the exhaust pipeline when necessary, such as after completing the required detection, so as to avoid air pollution, and the exhaust gas treatment device can be a water washing and combustion integrated exhaust gas treatment device (Scrubber).
The utility model discloses can simulate the exhaust emissions of the diesel engine of multiple power model, can greatly improve the accuracy of aassessment diesel vehicle tail gas cleanup unit's emission reduction effect, reduce the aassessment cost.
Example two
For making the technical scheme of the utility model and advantage clearer, following signal one kind according to the diesel engine tail gas particulate matter simulation method that the diesel engine tail gas particulate matter production system of embodiment one goes on, so can cite to this embodiment in the whole to the description of diesel engine tail gas particulate matter production system in embodiment one, to in this embodiment of the purpose of succinct diesel engine tail gas particulate matter production system does not do and gives unnecessary details, specifically please refer to embodiment one.
As shown in fig. 4, the method for simulating particulate matters in exhaust gas of a diesel engine comprises the following steps:
s01: providing a diesel exhaust particulate generation system according to any one of the embodiments;
s02: adjusting any one or more parameters of the oil injection timing adjusting module 2, the air intake adjusting module 3 and the load adjusting module 5 of the diesel engine exhaust particulate matter generating system, and measuring the particle size distribution data of the exhaust particulate matter generated by the diesel engine exhaust particulate matter generating system after each adjustment to establish an exhaust particulate matter characteristic database of the diesel engine exhaust particulate matter generating system, wherein the database records the particle size distribution data of the exhaust particulate matter generated corresponding to each adjustment scheme (namely the number of particulate matters with a plurality of particle size models generated under an operation scheme formed by three parameters of air intake oxygen content, oil injection advance angle and load);
s03: and comparing the particle size distribution data of the exhaust particles in the exhaust particle characteristic database with the particle size distribution data of the target exhaust particles to determine the particle size distribution data of the exhaust particles which is closest to the particle size distribution data of the target exhaust particles in the exhaust particle characteristic database, so as to obtain the optimal operating parameters of the diesel generator, wherein the optimal operating parameters of the diesel generator are the optimal operating parameters of the target diesel vehicle.
As an example, the particle size distribution data of the target exhaust particulate matter (the particle size distribution data represents the particle size distribution of the exhaust particulate matter, i.e. the particle size distribution of the exhaust particulate matter is digitized, and generally the particle size distribution data includes the particle size model of the particulate matter and the number of the particulate matter corresponding to the particle size model) is determined by the emission standard of the target diesel vehicle (diesel engine), and the standard is generally determined according to the relevant requirements of national environmental protection. According to the previous policy, the national five emission standard of heavy-duty diesel vehicles is comprehensively implemented in 2017, 7 and 1 days, and the national five emission standard of light-duty diesel vehicles is comprehensively implemented in 2018, 1 and 1 days, so that the particle size distribution data of the target exhaust particles can be determined according to the model of the target diesel vehicle (diesel engine), such as the parameters of the number of cylinders, stroke type, cylinder arrangement, cylinder diameter and the like of the target diesel engine, and the emission standard established by the country.
As an example, the injection timing adjustment module 2 comprises 5 adjustment levels of-20 CA, -15CA, -10CA, -5CA, 0CA and the like; the load adjusting module 5 comprises 5 adjusting levels of 20%, 40%, 60%, 80%, 100% and the like; the intake air adjusting module 3 comprises 5 adjusting levels of 21%, 19%, 17%, 15% and 13%; and adjusting the oil injection timing adjusting module 2, the air intake adjusting module 3 and the load adjusting module 5 by adopting a permutation and combination method to obtain the particle size distribution data of the exhaust particles generated by the diesel engine exhaust particle generating system under 125 different schemes. This adjustment is the same as the adjustment of the actual operating parameters of the target diesel vehicle, so that the optimal operating scheme obtained by adjustment according to this ratio can be directly applied to the parameter adjustment of the target diesel vehicle. Of course, the adjustment levels of the fuel injection timing adjustment module 2, the load adjustment module 5 and the intake air adjustment module 3 may also be set to generate a desired kind of exhaust emission scheme so as to provide the most realistic situation for the evaluation of the particulate matter emission reduction effect of the target diesel vehicle exhaust purification device to improve the accuracy of the evaluation, which is not strictly limited in this embodiment. According to the specific structure of the diesel engine exhaust particulate matter generating system, the adjusting process can be manually completed or completed through the central controller.
As an example, in the present embodiment, an EEPS3090 particle size spectrometer is used to measure the particle size distribution data of the exhaust particles generated by the exhaust system of the diesel engine after each adjustment and discharged through the exhaust pipeline 12, wherein the particle size distribution data includes the number of the particles. The EEPS3090 particle size spectrometer has 22 charge detectors and 32 data channels to provide fine resolution, high detection speed and capability of providing rapid determination of particle size distribution of particles. Of course, in other examples, other devices may be used to detect the particle size distribution data of the exhaust particles, and the embodiment is not limited strictly. Importantly, the detection index of the detection device needs to meet the detection requirement of the particle size distribution data of the target exhaust particles.
As an example, in the process of measuring the particle size distribution data of the exhaust particulate matter, the second inert gas control valve 412 may be adjusted according to the detection result of the second oxygen sensor 45 to adjust the content of the second inert gas mixed in the exhaust gas to control the exhaust dilution ratio; the second pressure control valve 422 can be adjusted according to the detection result of the second pressure sensor 421 to ensure that the tail gas of the diesel generator 1 can be smoothly discharged without affecting the normal operation of the diesel generator 1; in addition, the heater 431 may be activated according to the measurement results of the thermometer 45 and the temperature measuring instrument 432 to ensure that the temperature of the second inert gas introduced is consistent with the exhaust temperature in the exhaust pipeline 12, so as not to generate condensation.
As an example, the process of comparing the particle size distribution data of the exhaust particulate matter in the exhaust particulate matter characteristic database with the particle size distribution data of the target exhaust particulate matter to determine the particle size distribution data of the exhaust particulate matter in the exhaust particulate matter characteristic database that is closest to the particle size distribution data of the target exhaust particulate matter is as follows:
determining particle size distribution data of the target exhaust particles based on the original emission parameters of the target diesel engine;
defining the particle size distribution data of the target exhaust particles as an array Dt (PN)t 01,PNt 02,…PNt kWherein k represents a particle size number, PNt kThe quantity of the particles corresponding to the particle size type in the particle size distribution data representing the target exhaust particles); defining the particle size distribution data of the corresponding scheme nnn in the exhaust particulate matter characteristic database as an array Dd (PN)nnn 01,PNnnn 02,…PNk nnnWherein, PNk nnnRepresenting the number of particles corresponding to the particle size model in the exhaust particle characteristic database, nnn is a scheme number), calculating the particle size distribution data of the exhaust particles generated by the diesel engine exhaust particle generation system after each adjustment in the exhaust particle characteristic database and the particle size distribution number of the target exhaust particles based on the following formulaAccording to the cosine value of the number of the cosine,
and determining a maximum cosine value based on the plurality of obtained cosine values, wherein the parameter in the scheme corresponding to the maximum cosine value is the optimal operation parameter of the diesel generator, and the parameter is the optimal operation parameter of the target diesel vehicle.
It should be noted that, in the present application, an EEPS3090 particle size spectrometer is used to measure the particle size distribution data of the exhaust particles in the exhaust pipeline, which are generated by the diesel engine exhaust particle generating system after each adjustment, and the EEPS3090 particle size spectrometer has 32 data channels, that is, 32 particle size models; if other types of detection devices are used, the number of particle size models may vary, and thus the amount of data that is ultimately measured and analyzed may vary. Theoretically, the more the particle size models are, the more accurate the final evaluation result is, but the specific particle size model setting needs to be in accordance with the diesel engine exhaust emission standard of the target market.
Of course, in other examples, the particle size distribution data of the exhaust gas particulate matter closest to the particle size distribution data of the target exhaust gas particulate matter in the exhaust gas particulate matter feature database may also be determined based on a pearson correlation coefficient method or a minkowski distance or other similarity measure method; or the closest particle size distribution data can be determined by calculating the mean and variance, and the like, or even determined based on the current big data algorithm, which is not strictly limited in this embodiment. In order to improve the evaluation accuracy, theoretically, the more the sampling data is, the better the adjustment times included in step S02 is, but the actual adjustment times also need to be determined according to the model of the target diesel engine, such as the adjustable range of the injection timing advance angle and the adjustable range of the load.
As an example, the diesel exhaust particulate matter simulation method further comprises the step of operating the diesel exhaust particulate matter generation system according to the optimal operating parameters for verification after the optimal operating parameters of the diesel generator are obtained. For example, the diesel generator is operated according to the determined optimal operating parameters of the diesel engine, the particle size distribution of the simulated exhaust particles is measured in real time, the proportion of the second inert gas in the exhaust pipeline is firstly finely adjusted to enable the mass and the quantity of the exhaust particles in the exhaust pipeline to be further close to the particle size distribution data of the target exhaust particles, and then the fuel injection timing adjusting module is finely adjusted to obtain the particle size distribution data closer to the target. Of course, the simulation method and the verification method are only exemplary, and other methods may be used according to the specific structure of the diesel exhaust particulate matter generating system, which is not limited in this embodiment.
To sum up, the utility model provides a diesel engine tail gas particulate matter produces system, include: a diesel generator having an air intake line and an exhaust line; the fuel injection timing adjusting module is connected with the diesel generator and used for adjusting the fuel injection timing of the diesel generator, and the fuel injection timing adjusting module is provided with a plurality of adjusting grades; the air inlet adjusting module is connected with the air inlet pipeline and used for adjusting air inlet of the diesel generator; the exhaust adjusting module is connected with the exhaust pipeline and used for adjusting the exhaust of the diesel generator; and the load adjusting module is connected with the diesel generator and is used for adjusting the load of the diesel generator. The utility model discloses a diesel engine exhaust particulate matter produces system can simulate target diesel engine's true operational environment completely in order to ensure that its exhaust tail gas and target diesel engine's the component and the tail gas particulate matter particle size distribution of exhaust tail gas are unanimous to reduce discharging the effect and provide the accuracy of truest situation in order to improve the aassessment for aassessment diesel vehicle exhaust gas purification device's particulate matter. In addition, the application can simulate the exhaust emission of diesel engines with various powers/models, and compared with real vehicle evaluation, the method for evaluating the exhaust generated by the diesel engine exhaust particle generating system can obviously reduce the evaluation cost.
Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A diesel exhaust particulate matter generation system, comprising:
a diesel generator having an air intake line and an exhaust line;
the fuel injection timing adjusting module is connected with the diesel generator and used for adjusting the fuel injection timing of the diesel generator, and the fuel injection timing adjusting module is provided with a plurality of adjusting grades;
the air inlet adjusting module is connected with the air inlet pipeline and used for adjusting air inlet of the diesel generator;
the exhaust adjusting module is connected with the exhaust pipeline and used for adjusting the exhaust of the diesel generator;
and the load adjusting module is connected with the diesel generator and is used for adjusting the load of the diesel generator.
2. The diesel exhaust particulate generation system of claim 1, wherein: the power of the diesel generator is 3-10 kW, and the oil injection timing adjusting module has 5 adjusting grades of-20 CA, -15CA, -10CA, -5CA and 0 CA.
3. The diesel exhaust particulate generation system of claim 1, wherein: the air inlet adjusting module comprises an oxygen supply unit, a first inert gas supply unit and a first air pressure adjusting unit, and the oxygen supply unit, the first inert gas supply unit and the first air pressure adjusting unit are all connected with the air inlet pipeline; the oxygen supply unit is used for supplying oxygen into the air inlet pipeline; the first inert gas supply unit is used for supplying inert gas into the air inlet pipeline according to the requirement so as to change the oxygen content in the air inlet pipeline; the first air pressure adjusting unit is used for adjusting the air pressure in the air inlet pipeline according to the requirement so that the air inlet pressure of the air inlet pipeline can ensure that the diesel generator operates within the design range.
4. The diesel exhaust particulate generation system of claim 3, wherein: the oxygen supply unit comprises a first oxygen sensor for detecting the oxygen content in the intake pipe and an oxygen control valve for regulating the oxygen content in the intake pipe; the first inert gas supply unit comprises a first inert gas pipeline and a first inert gas control valve, the first inert gas pipeline is communicated with the air inlet pipeline, and the first inert gas control valve is used for adjusting the supply amount of the first inert gas so as to change the oxygen content in the air inlet pipeline; the first pressure regulating unit includes a first pressure sensor for detecting a gas pressure in the intake pipe, and a first pressure control valve for regulating the gas pressure in the intake pipe.
5. The diesel exhaust particulate generation system of claim 4, wherein: the oxygen supply unit may adjust the oxygen content in the intake line to 21%, 19%, 17%, 15% and 13% 5 steps.
6. The diesel exhaust particulate generation system of claim 1, wherein: the exhaust adjusting module comprises a second inert gas supply unit and a second gas pressure adjusting unit; the second inert gas supply unit comprises a second inert gas pipeline and a second inert gas control valve, the second inert gas pipeline is communicated with the exhaust pipeline, and the second inert gas control valve is used for adjusting the supply amount of second inert gas so as to change the exhaust component ratio in the exhaust pipeline; the second air pressure adjusting unit includes a second pressure sensor for detecting a gas pressure in the exhaust line and a second pressure control valve for adjusting the gas pressure in the exhaust line to ensure that the diesel generator can normally operate.
7. The diesel exhaust particulate generation system of claim 6, wherein: the exhaust adjusting module further comprises a heating unit, the heating unit is connected with the second inert gas pipeline, the heating unit comprises a heater and a temperature measuring instrument, the temperature measuring instrument is used for measuring the temperature of the second inert gas in the second inert gas pipeline, and the heater is used for heating the second inert gas.
8. The diesel exhaust particulate generation system of claim 1, wherein: the load adjusting module comprises a plurality of relays and a plurality of load units which are connected with the relays in a one-to-one correspondence mode, and the load of the diesel generator is adjusted through connection or disconnection of the relays.
9. The diesel exhaust particulate generation system of claim 1, wherein: the load adjustment module may adjust a load of the diesel generator to 20%, 40%, 60%, 80%, 100% 5 gear.
10. The diesel exhaust particulate generation system of any one of claims 1 to 9, wherein: the diesel engine exhaust particulate matter generating system further comprises a central controller, and the central controller is connected with the air inlet adjusting module, the exhaust adjusting module and the load adjusting module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308005A (en) * | 2019-06-12 | 2019-10-08 | 上海市环境科学研究院 | Fractions of Diesel Engine Exhaust Particulates object generation system and Fractions of Diesel Engine Exhaust Particulates object analogy method |
| CN113552313A (en) * | 2021-06-22 | 2021-10-26 | 首钢集团有限公司 | Coke high-temperature performance detection device and detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308005A (en) * | 2019-06-12 | 2019-10-08 | 上海市环境科学研究院 | Fractions of Diesel Engine Exhaust Particulates object generation system and Fractions of Diesel Engine Exhaust Particulates object analogy method |
| CN113552313A (en) * | 2021-06-22 | 2021-10-26 | 首钢集团有限公司 | Coke high-temperature performance detection device and detection method |
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