CN101986151B - Method for measuring content of methanol in evaporative pollutants of methanol vehicle and device thereof - Google Patents
Method for measuring content of methanol in evaporative pollutants of methanol vehicle and device thereof Download PDFInfo
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Abstract
The invention relates to measurement of evaporative pollutants of a vehicle, in particular to a method for measuring the content of methanol in the evaporative pollutants on the methanol vehicle and a device for implementing the method. Sampling are performed for four times in the method, wherein the first sampling is background sampling, the second sampling is methanol sampling after a hot dipping test, the third sampling and the fourth sampling are methanol sampling before and after a diurnal breathing loss test; and in each testing phase, a gas chromatograph is adopted to analyze the content of the methanol in the evaporant in the phase before and after sampling. The invention mainly provides the method and the device capable of accurately measuring the methanol exhaust in the evaporative pollutants of the methanol vehicle, and solves the technical problem that the methanol exhaust concentration in the evaporative pollutants of the vehicle cannot be accurately measured or evaluatedin the prior art.
Description
Technical field
The present invention relates to a kind of detection of automobile evaporative pollutants, relate in particular to a kind of method of testing that detects methanol content in the evaporative pollutants and device of this method of realization of being applied on the methanol vehicle.
Background technology
Along with the development of industrial technology, automobile becomes the important walking-replacing tool of people.The fuel of automobile has liquid fuel such as gasoline, diesel oil, methyl alcohol, ethanol, biodiesel at present, also can be gaseous fuels such as dimethyl ether, liquefied petroleum gas (LPG), compressed natural gas, liquefied natural gas (LNG), hydrogen.Because be liquid under the methyl alcohol normal temperature, modes such as accumulating are close with gasoline, diesel, thermal efficiency height, physicochemical property satisfy motor car engine to be used, so methyl alcohol is one of important vehicle alternative fuel at present.Methyl alcohol is as vehicle fuel, and the use on vehicle has multiple, comprises the use of M100 methyl alcohol, M85 methanol gasoline mixed fuel and methanol gasoline mixed fuels such as low ratio M15, M10.The detection of general automobiles evaporative pollutants has now had special national standard to define.But the automobile of methanol vehicle or use methanol gasoline mixed fuel, the discharge vaporization amount of methyl alcohol in its airtight evaporative emission is one of focus of paying close attention in the industry.How many methyl alcohol discharge capacitys in its evaporative pollutants is, adopts what method and apparatus to detect, and also do not have the conclusion of this respect so far.
Summary of the invention
The present invention mainly provides a kind of method of testing that can accurately detect the methyl alcohol discharging in the methanol vehicle evaporative pollutants; Solve the technical matters that existing in prior technology can't accurately detect and estimate for the methyl alcohol concentration of emission in the automobile evaporative pollutants.
It is a kind of simple in structure that the present invention also provides simultaneously, the proving installation of the methyl alcohol discharging in the high detection methanol vehicle evaporative pollutants of operational reliability; Solve the technical matters to the detection of the methanol content in the methanol vehicle evaporative pollutants of can't realizing that exists in the prior art.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: the method for testing of methanol content in a kind of methanol vehicle evaporative pollutants, the first step, methanol vehicle to be tested is carried out pre-service under the normal temperature and pressure situation, described pre-service is the simulated automotive travel conditions, and collection atmosphere, composition in the atmosphere is detected, obtain methanol content in the atmosphere; Second step pushed above-mentioned automobile in the airtight testing laboratory, carried out hot dipping and tested, and after the hot dipping test, collected the boil-off gas in the airtight testing laboratory, utilized gas chromatograph to detect the interior methanol content of gas that the hot dipping experimental stage ends; The data that begin as the hot dipping experimental stage with the methanol content that obtains in the first step, the data analysis that obtains in above-mentioned two steps is obtained the methanol content in the evaporative pollutants of hot dipping test, the 3rd step, automobile in the last step is soaked car, soak the gas of gathering behind the car in the airtight testing laboratory, detect the methanol content in the gas, with the beginning data of these data as the 3rd step experimental stage, and then carry out ventilation test between daytime, after ventilation between daytime, collect the boil-off gas in the airtight testing laboratory, utilize gas chromatograph to detect the interior methanol content of gas as the end of a period data of the 3rd step experimental stage; Primary data in the 3rd step and end of a period data are analyzed the methanol content that contrasts in the evaporative pollutants that obtains ventilation test between daytime; In the 4th step, the detection data of the hot dipping test that second step is interior and the data addition that ventilation test detects between the daytime in the 3rd step obtain the total amount of methanol content in the evaporative pollutants.
The methanol content of the evaporative pollutants in the methanol vehicle detects to come out by original equipment and method, carry out four samplings altogether in the present invention, it for the first time is the background sampling, be in the first step to atmospheric sampling, gas sampling result when not having automobile in atmospheric sampling and the airtight testing laboratory is the same, so can be for the second time the methyl alcohol sampling of hot dipping test back to the initial value of atmospheric sampling as the phase one test; For the third time and be for the 4th time methyl alcohol sampling before and after the ventilation test between daytime, each experimental stage draws methanol content in this phase evaporation thing by the front and back sampling analysis.The methanol content addition of the detection of two experimental stages is exactly in entire test, simulated the various states of automobile after, the total content of the methyl alcohol in the automobile evaporative pollutants.The gaseous sample that uses the silica gel adsorption pipe to gather, the methyl alcohol component of gathering with the stripping liquid wash-out, the flame ionization ditector by gas chromatograph can accurately detect the methanol concentration in the eluent then.Flame ionization ditector, when entering gas chromatographic column, organism obtains separating, enter the ion chamber, react and produce positive ion and electronics, produce little electric current to the two poles of the earth directed movement respectively under the effect that adds the constant dc field, the size of little electric current is directly proportional with the target compound quality that enters the ion chamber under certain condition.
As preferably, interior methanol content of described second step and the 3rd step is by formula:
Calculate, wherein M
hBe the discharge quality of methyl alcohol pollutant, g; ρ
2Be the methanol content of experimental stage end of a period confined chamber, mg/m
3ρ
1The methanol content of the initial confined chamber of=experimental stage, mg/m
3V=removes the confined chamber net volume behind the automobile volume, m
3Utilize above-mentioned formula to calculate, can accurately draw the methanol content in the evaporative pollutants, the convenient analysis.
As preferably, before described pre-service, automobile is placed on outside the airtight testing laboratory, carry out normal temperature environment and soak car, the automobile Normal Environmental Temperature was placed 12～36 hours for 20～30 ℃.The car that soaks of normal temperature environment is exactly before automobile is entered airtight test, and quiet putting in air cools completely car earlier, plans to implement the state of sailing at the chassis dynamometer patrix then, pushes then in the airtight testing laboratory and detects.
As preferably, the time of the hot dipping test in described second step is 1h ± 0.5min, through hot dipping test back automobile is soaked car in airtight testing laboratory, soak car and maintain the temperature at 20 ± 2 ℃ and placed 6～36 hours down, ventilation test is to place 24h ± 6min in 20 ℃～35 ℃ of airtight test indoor temperatures between daytime.Hot dipping test mainly is that to detect engine just flame-out, and simulated automotive travels when going home, and motor car engine and vehicle fuel system are in hot state, quiet discharge vaporization when being placed on 23～31 ℃.If soak the car owner automobile is cooled completely.To be that simulated automotive is quiet put a daytime and a night in ventilation test between daytime, and temperature variation is tested according to the temperature in " variation of ambient temperature table between daytime ".Accurately control the temperature and time in each stage, can improve the accuracy of detection.
The proving installation of methanol content in a kind of methanol vehicle evaporative pollutants, comprise methanol vehicle, chassis dynamometer, airtight testing laboratory, side in airtight testing laboratory is provided with by-pass valve, described by-pass valve is connected with sampling pump, and each component content of the gas of sampling pump collection detects by gas chromatograph.Chassis dynamometer is used for the transport condition of simulated automotive, the convenient evaporative pollutants of gathering automobile of airtight testing laboratory.Side in airtight testing laboratory is equipped with by-pass valve, can be before automobile push airtight testing laboratory, and spray into propane by by-pass valve earlier and detect leak rate in the airtight testing laboratory; After test phase finishes, can the gas in it be derived by by-pass valve simultaneously, by-pass valve is connected with sampling pump, and the adsorption tube in the sampling pump has adsorbed the methyl alcohol in the gas evaporation pollutant, carries out detection level by gas chromatograph then.
As preferably, described by-pass valve connects sampling pump by silicone tube, and the flow velocity of described sampling pump is 0.02～0.2L/min, and the sampling time is 10～30min, and sampling quantity is 1～5L.Parameter designing in the sampling pump is set corresponding sampling parameter according to the ability difference of adsorption tube.Airtight test cabinet is connected by silicone tube with sampling pump, improves the accuracy of sealing and detection
As preferably, the gas of described sampling pump detects by the flame ionization ditector of gas chromatograph.
Therefore, the method for testing of methanol content and device thereof have following advantage in the methanol vehicle evaporative pollutants of the present invention: in airtight test cabinet automobile is carried out discharge vaporization and detect the accuracy height; To carrying out double sampling before and after each process of the test, utilize gas chromatograph that the methyl alcohol in the sample gas is detected analysis then, finish the detection to the methanol concentration in the automobile evaporative emission; Airtight test cabinet is connected by silicone tube with sampling pump, improves the accuracy of sealing and detection.
Description of drawings:
Fig. 1 is the process flow diagram of the method for testing of methanol content in the methanol vehicle evaporative pollutants of the present invention.
Fig. 2 is the synoptic diagram of the proving installation of methanol content in the methanol vehicle evaporative pollutants of the present invention.
Embodiment:
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
As shown in Figure 1, the method of testing of methanol content in a kind of methanol vehicle evaporative pollutants, earlier automobile is placed in the atmosphere, make in the normal temperature environment of automobile, maintain the temperature at 20～30 ℃, carry out 24 hours the car that soaks, then methanol vehicle is placed on the road conditions of simulation running car on the chassis dynamometer, after chassis dynamometer carries out pre-service, methanol vehicle is pushed in the airtight testing laboratory, simultaneously, atmosphere is initially sampled, methanol content in the gas of analytical sampling as the beginning data of next stage hot dipping test, carries out car the hot dipping test then, hot dipping test is with car is quiet when being placed on environment temperature and being 23～31 ℃, put about 1 hour car is quiet, simulated automotive travels when going home, the state when motor car engine and vehicle fuel system are in hot state.End in this experimental stage, gather the gas in the airtight testing laboratory again, utilize the methanol content in the gas chromatograph analytical sampling gas, as hot dipping experimental stage end of a period data; And then car is placed on soaked car in the airtight testing laboratory 6 hours, maintain the temperature at 20 ± 2 ℃, gather the gas in the airtight testing laboratory then, detect the methanol content in the gas, as next stage---the beginning data of aeration phase between daytime, then car is carried out ventilation test between daytime, ventilation test is car to be placed on parked in the airtight testing laboratory 24 hours between daytime, and test according to the temperature that requires of " variation of ambient temperature table between daytime ", detect its discharge vaporization, finishing between daytime after the ventilation test, gather the gas in the airtight testing laboratory, analyze methanol content wherein, as the end of a period data of ventilation test between daytime.4 data of above-mentioned collection are according to formula
In the formula: M
hThe discharge quality of=methyl alcohol pollutant, g;
ρ
2The methanol content of=stage end of a period confined chamber, mg/m
3
ρ
1The methanol content of initial confined chamber of=stage, mg/m
3
V=removes the confined chamber net volume behind the automobile volume, m
3
Calculate the discharge quality of methyl alcohol pollutant, wherein the following formula that passes through of methanol content calculates: ρ i=(W-B)/Vi
In the formula: methanol content in the ρ i=gas, mg/m
3
Methanol content in the W=adsorption tube, μ g
Methanol content in the blank pipe of B=, μ g
The Vi=sampling volume, L.
Just can draw according to above-mentioned two formula, in this test, the gross mass of the methyl alcohol pollutant in the evaporative pollutants of methanol vehicle is:
M
H is total=M
Hdi+ M
Hhs
In the formula: M
H is total=automobile methyl alcohol pollutant emission gross mass, g;
M
HdiMethyl alcohol pollutant emission quality during ventilation test between=daytime, g;
M
HhsMethyl alcohol pollutant emission quality during=hot dipping test, g.
Just can be calculated the content of methyl alcohol pollutant very accurately by said method and formula.In said method, use sampling pump to sample, sampled data is: the flow velocity of sampling pump is 0.02～0.2L/min, sampling time is 10～30min, sampling quantity is 1～5L, The data 5% isopropyl alcohol that sampling pump samples namely dissolves 5% propyl alcohol in 95% distilled water, and as stripping liquid, the model of utilizing U.S. Agilent company then detects methanol content in the analytical sampling gas for the flame ionization ditector of Agilent GC6890 gas chromatograph.
As shown in Figure 2, the proving installation of methanol content in a kind of methanol vehicle evaporative pollutants, comprise chassis dynamometer 13, after the methanol vehicle of test is placed on the chassis dynamometer 13 the simulation road conditions and handles, methanol vehicle is pushed in the airtight test cabinet 14 then, carry out hot dipping test and ventilation test between daytime, connecting sampling pump 16 as sampling unit in the side of airtight test cabinet 14 by by-pass valve 15, in order to improve sealing effectiveness, adopt silicone tube 17 to connect between by-pass valve 15 and the sampling pump 16.Gas in the initial and test cabinet at the end in each stage in 16 pairs of airtight testing laboratories of sampling pump is sampled, again sample gas is utilized gas chromatograph 18 to analyze, and with test before the data compare of analysis, thereby calculate methanol concentration in the evaporative pollutants of methanol vehicle.
Claims (3)
1. the method for testing of methanol content in the methanol vehicle evaporative pollutants, it is characterized in that: the first step, methanol vehicle to be tested is carried out pre-service under the normal temperature and pressure situation, described pre-service is the simulated automotive travel conditions, and collection atmosphere, composition in the atmosphere is detected, obtain methanol content in the atmosphere; Second step pushed above-mentioned automobile in the airtight testing laboratory, carried out hot dipping and tested, and after the hot dipping test, collected the boil-off gas in the airtight testing laboratory, utilized gas chromatograph to detect the interior methanol content of gas that the hot dipping experimental stage ends; The data that begin as the hot dipping experimental stage with the methanol content that obtains in the first step, the data analysis that obtains in above-mentioned two steps is obtained the methanol content in the evaporative pollutants of hot dipping test, the 3rd step, automobile in the last step is soaked car, soak the gas of gathering behind the car in the airtight testing laboratory, detect the methanol content in the gas, with the beginning data of these data as the 3rd step experimental stage, and then carry out ventilation test between daytime, after ventilation between daytime, collect the boil-off gas in the airtight testing laboratory, utilize gas chromatograph to detect the interior methanol content of gas as the end of a period data of the 3rd step experimental stage; Primary data in the 3rd step and end of a period data are analyzed the methanol content that contrasts in the evaporative pollutants that obtains ventilation test between daytime; The 4th step obtained the total amount of methanol content in the evaporative pollutants with the detection data addition of ventilation test between the daytime in the detection data of the hot dipping test in second step and the 3rd step, and described second step and the 3rd goes on foot interior methanol content by formula:
Calculate, wherein M
hBe the discharge quality of methyl alcohol pollutant, g; ρ
2Be the methanol content of experimental stage end of a period confined chamber, mg/m
3ρ
1The methanol content of the initial confined chamber of=experimental stage, mg/m
3V=removes the confined chamber net volume behind the automobile volume, m
3
2. the method for testing of methanol content in a kind of methanol vehicle evaporative pollutants according to claim 1; it is characterized in that: before described pre-service, automobile is placed on outside the airtight testing laboratory; carry out normal temperature environment and soak car, the automobile Normal Environmental Temperature was placed 12～36 hours for 20～30 ℃.
3. the method for testing of methanol content in a kind of methanol vehicle evaporative pollutants according to claim 1, it is characterized in that: the time of the hot dipping test in described second step is 1h ± 0.5min, through hot dipping test back automobile is soaked car in airtight testing laboratory, soak car and maintain the temperature at 20 ± 2 ℃ and placed 6～36 hours down, ventilation test is to place 24h ± 6min in 20 ℃～35 ℃ of airtight test indoor temperatures between daytime.
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| CN102445247B (en) * | 2011-06-21 | 2013-05-22 | 上海华普汽车有限公司 | Method for measuring fuel consumption of methanol vehicle |
| CN108761026A (en) * | 2018-06-04 | 2018-11-06 | 湖南吉利汽车部件有限公司 | Methanol gasoline double fuel or fuel combination vehicle evaporative pollutants measurement method and its device |
| CN112414724A (en) * | 2020-11-18 | 2021-02-26 | 上海市环境科学研究院 | Testing device and testing method for evaporative emission of gasoline vehicle |
| CN112630343A (en) * | 2020-12-04 | 2021-04-09 | 中汽研汽车检验中心（天津）有限公司 | Method for testing, tracing and rectifying hydrocarbon pollutants of automobile tire |
| CN114384209B (en) * | 2022-01-17 | 2024-03-26 | 中国第一汽车股份有限公司 | Detection and analysis method for hydrocarbon contribution degree of vehicle nonmetallic part |
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Non-Patent Citations (3)
| Title |
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| 楼狄明等.天然气制油-柴油混合燃料对柴油轿车排放性能的研究.《2007年中国内燃机学会油品与清洁染料分会第一届学术年会论文》.2007,100-105. * |
| 葛蕴珊等.甲醇燃料汽车的排放特性研究.《北京理工大学学报》.2008,第28卷(第4期),314-318. * |
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Effective date of registration: 20220223 Address after: 310051 No. 1760, Jiangling Road, Hangzhou, Zhejiang, Binjiang District Patentee after: ZHEJIANG GEELY HOLDING GROUP Co.,Ltd. Address before: 201501 Shanghai city Jinshan District Fengjing Industrial Park Shanghai Maple Automobile Co. Patentee before: SHANGHAI MAPLE AUTOMOBILE Co.,Ltd. Patentee before: Zhejiang Geely Holding Group Co., Ltd |
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