CN101661020A - Test method and test device of emission of methanol automobile exhaust contaminant - Google Patents
Test method and test device of emission of methanol automobile exhaust contaminant Download PDFInfo
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- CN101661020A CN101661020A CN200910054695A CN200910054695A CN101661020A CN 101661020 A CN101661020 A CN 101661020A CN 200910054695 A CN200910054695 A CN 200910054695A CN 200910054695 A CN200910054695 A CN 200910054695A CN 101661020 A CN101661020 A CN 101661020A
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Abstract
The invention relates to a test method and a test device of the emission of methanol automobile exhaust contaminant. The method comprises the following steps: setting parameters of a methanal samplingpump, then operating a methanol test automobile on a chassis dynamometer, collecting methanal automobile exhaust in the cycle operation process, continuously diluting and mixing collected exhaust byusing air, and sampling and analyzing methanal exhaust contaminant after the cycle operation of the methanol test automobile is finished; separating by a chromatographic column and measuring by a highperformance liquid chromatograph, thereby analyzing and calculating the concentration of the absorbed methanal and calculating the emission quality of the methanal contaminant by adopting a formula:M[HCHO]=V[mix]*C[HCHO]/d. The invention mainly provides the test method and the test device which can realize that the content of conventional contaminants of carbon monoxide (CO), hydrocarbon (HC), nitric oxide (NOX) and particulate matter (PM) as well as the content of unconventional exhaust contaminant methanal (HCHO) can be collected and analyzed simultaneously and the emission concentration of the methanol automobile exhaust can be accurately tested during a test circulation, and solves the technical problem that the emission concentration of the methanal in the automotive exhaust can notbe accurately tested and quantitatively evaluated.
Description
Technical field
The present invention relates to a kind of method of testing and device thereof of automobile exhaust pollutant discharge, relate in particular to the method for testing and the device thereof of emission of methanol automobile exhaust contaminant.
Background technology
At present, the environmental protection consciousness of countries in the world strengthens day by day, and is also more and more stricter for the restriction of automotive emissions.Especially along with the research and development and the use of some new-energy automobiles such as gas combustion automobile, alcohol ether automobile, biomass fuel automobile etc., people no longer only pay close attention to the conventional exhaust contaminant of automobile, as carbon monoxide (CO), carbon dioxide (CO
2), hydrocarbon (HC), oxides of nitrogen (NO
X) and the discharging content of particle (PM), also begin to explore, study simultaneously the unconventional emission of automobile, as the discharge capacity of formaldehyde.
Chinese patent application is arranged now: " the employing device and method (CN101042314A) that formaldehyde content of engines tail gas detects ", this device comprises: a probe, and air inlet constant temperature mechanism, tail gas absorbs the mechanism of deriving, sample gas flow control mechanism; This method of sampling may further comprise the steps: (1) configuration absorption liquid; (2) the U type fritted glass disk bubbler with two series connection injects an amount of absorption liquid respectively; (3) an amount of absorbent cotton of packing in the drying tube; (4) air inlet constant temperature mechanism temperature is adjusted into 80 ± 2 ℃; (5) start minipump, maintain in 0.12L/min～0.15L/min flow range; (6) sky is taken out 5min; (7) beginning continuous sampling, the sampling time is controlled in 10min～15min scope; (8) after sampling finishes, absorption liquid is poured in the same volumetric flask, left standstill, promptly obtain the sampling solution of formaldehyde.Though this method provides the acquisition method of formaldehyde in a kind of motor exhaust, have following shortcoming: 1, this patent only is at the detection of formaldehyde in the engine exhaust pollutant, is not suitable for automobile; 2, do not have to propose the quantitative calculation method of the formaldehyde collect, and the dimension of formaldehyde emission is unknown; 3, exhaust pipe of engine place extreme temperatures in the test, the probe positions of therefore being responsible for the importing exhaust is difficult to install, and the installation site is not clear and definite; 4, the working order of test engine is not clear and definite, and different working orders differs bigger for the discharging of engine exhaust pollutant; 5, can't guarantee that the formaldehyde in the engine exhaust pollutant is all adsorbed, cause test error, influence accuracy of experimental results.
Summary of the invention
The present invention mainly provides a kind of can being implemented in the same test cyclic process and gathers, analyzes the carbon monoxide (CO), hydrocarbon (HC), the oxides of nitrogen (NO that discharge in the vehicle exhaust simultaneously
X) and conventional pollutant load of particle (PM) and the unconventional content that discharges pollutants of formaldehyde (HCHO), can accurately detect the method for testing and the device of methanol vehicle exhaust emissions concentration; Solved exist in the prior art can't accurately detect technical matters with quantitative evaluation for the formaldehyde emissions concentration in the vehicle exhaust.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: a kind of method of testing of emission of methanol automobile exhaust contaminant, and at first the PARA FORMALDEHYDE PRILLS(91,95) sampling pump carries out parameter setting, and testing laboratory's air is carried out basic background sampling; Then to the sealing of sampler bag extracting vacuum with the check sampling system; To test methanol vehicle then turns round on chassis dynamometer, in the operation cycle process, the methanol vehicle exhaust collection is got up, and use air that the tail gas of collecting is carried out serial dilution and mixing, according to the different operation cycle situation of test methanol vehicle, the gas that mixes is imported in the corresponding sampler bag; After test methanol vehicle operation cycle finishes, carry out the check and analysis of conventional exhaust contaminant earlier, after analysis is finished, carry out the sampling analysis of formaldehyde exhaust contaminant again, the sampling analysis of described formaldehyde exhaust contaminant is to open the good sampling pump of parameter setting earlier the gas in the sampler bag is gathered, sampling pipe in the sampling pump scribbles 2,4 dinitrophenyl hydrazine, but PARA FORMALDEHYDE PRILLS(91,95) adsorbs; Sampling is carried out wash-out with second is fine to the sampling pipe that has adsorbed formaldehyde after finishing, through the separation of chromatographic column, measures by high performance liquid chromatograph, thus the concentration of analytical calculation absorbing formaldehyde.
As preferably, before test, the test methanol vehicle is carried out pre-service, check performance, the state of automobile, guarantee that the test car mechanical condition is good, exhaust system without any leak, the good airproof performance of gas handling system, the test methanol vehicle can cruising, can normally start under cold conditions, hot condition.According to the concrete condition of test methanol vehicle, running, inertia, the load of chassis dynamometer are proofreaied and correct and set.The running on chassis dynamometer of test methanol vehicle, exhaustion dilution, exhaust collection, temperature and humidity control all configure before the test prerequisite, improve reliability of testing result and accuracy.
The test methanol vehicle is simulated the various different working orders of real car fully, and the tail gas to vehicular discharge under different working orders is collected detection, has improved the accuracy that tail gas detects; Before the test, the air of testing laboratory is sampled, determine airborne concentration of formaldehyde, concrete grammar is: the formaldehyde sampling pump is placed in the exhaust gas sampling system of testing laboratory behind the air cleaner, setting formaldehyde sampling pump flow is 400ml/min, sampling time 30min, sampling quantity 12L.Can certainly be according to the adsorptive power difference of sampling pipe in the model of formaldehyde sampling pump, the sampling pump, set corresponding suitable sampling parameter, so that the formaldehyde in the methanol vehicle exhaust emissions is all adsorbed, guarantee the authenticity of the reliable and test figure of test findings.
Operation cycle comprises one one of operation cycle and two two kinds of operating modes of operation cycle, and the test methanol vehicle is input in first sampler bag in the exhaust of one one of operation cycle, and the test methanol vehicle is input in second sampler bag in the exhaust of two ones of operation cycle.One one of operation cycle can be the operating mode of low speed urban district operation cycle, two ones of operation cycle can be the operating mode of high speed suburbs operation cycle, low speed divides two different sampler bags to collect with the operating mode that runs up, and calculate the content of conventional emission and unconventional emission-formaldehyde according to the test result analysis-by-synthesis, the operation characteristic that meets vehicle, reduce error, improve accuracy.Sampling can at first be carried out real-time check and analysis to conventional exhaust contaminant by the sampling of auto exhaust system, and then unconventional exhaust contaminant formaldehyde is carried out sampling analysis after finishing.Detect when can be implemented in same test circulation like this conventional exhaust contaminant of test car and formaldehyde.After the formaldehyde sampling finishes, in sampler bag, charge into nitrogen, airbag is washed, make sampler bag to reuse, and guaranteed the accuracy of test next time.
Utilize the result of this method test can reach the dimension that discharges pollutants and come to the same thing with the automobile routine, unit is g/km, can be implemented in the same test cyclic process and gather simultaneously, analyze the carbon monoxide (CO) that discharges in the vehicle exhaust, carbon dioxide (CO2), hydrocarbon (HC), oxides of nitrogen (NOX) and the conventional pollutant load of particle (PM) and the unconventional content that discharges pollutants of formaldehyde (HCHO), realized integrating with mutually, thoroughly solved existing in prior technology and can't accurately detect technical matters with quantitative evaluation for the formaldehyde emissions concentration in the vehicle exhaust with the conventional pollutant emission detection method of automobile.
As preferably, obtain the concentration by volume of absorbing formaldehyde after, according to its concentration by volume and sample gas total measurement (volume), and formaldehyde gas density under standard state, by formula: M
HCHO=V
Mix* C
HCHO/ d calculates the discharge quality of formaldehyde pollutant, wherein M
HCHOThe discharge quality of expression formaldehyde pollutant, unit is g/km; V
MixThe volume of expression diluted exhaust is proofreaied and correct to standard state, and promptly temperature is 273.2K, and pressure is 101.33kPa, and unit is L; C
HCHOConcentration of formaldehyde in the expression diluted exhaust, unit is g/L; D represents the distance that vehicle is travelled when testing by operation cycle, and unit is km.Utilize above-mentioned formula to calculate the discharge quality of formaldehyde, can get information about the content of formaldehyde in the tail gas, reach the dimension that comes to the same thing according to GB18352.3 emission test method test with automobile, integrate with mutually with the automobile exhaust pollutant discharge detection method, for content of formaldehyde in the test methanol vehicle exhaust emissions amount provides scientific and effective method.
As preferably, described conventional exhaust contaminant analysis is online check and analysis, the analysis of formaldehyde exhaust contaminant is the offline inspection analysis, after conventional exhaust contaminant analysis finishes, close the valve that is connected with conventional exhaust contaminant analytical equipment, open the gas valve that is connected with the formaldehyde sampling pump and carry out the check and analysis of formaldehyde exhaust contaminant.
As preferably, formaldehyde sampling pump sampling capacity is 12L, and sampling flow is set at 400mL/min, and the sampling time is set 30min.Can guarantee that formaldehyde gas is all adsorbed, guarantee the precision of testing.
A kind of proving installation of emission of methanol automobile exhaust contaminant comprises test methanol vehicle, chassis dynamometer, exhaust gas sampling system and exhaust gas collection analytic system;
Described test methanol vehicle is positioned on the chassis dynamometer, and the gas outlet of test methanol vehicle is connected with the exhaust gas sampling system by pipeline;
Described exhaust gas sampling system comprises the gas collection conduit of joining with gas outlet, on the gas collection conduit, be connected with the air access tube, gas in gas collection conduit and the air access tube mixes mutually in mixed air vessel, and mixed air vessel is connected with air pump, connects the exhaust gas collection analytic system on the air pump;
Described exhaust gas collection analytic system comprises the sampler bag that links to each other with air pump, described sampler bag is connected with normally gaseous pollutant analysis instrument and formaldehyde sampling pump simultaneously, described formaldehyde sampling pump carries out setup parameter before test, the sampling pipe absorbing formaldehyde gas in the formaldehyde sampling pump is also measured by high performance liquid chromatograph.
As preferably, connecting pipe between described formaldehyde sampling pump and sampler bag, sampler bag and the sampling of auto exhaust system is the teflon plastic tube, and the teflon plastic tube is connected with silicone tube with the connectivity port of sampling pump, sampler bag, exhaust gas sampling system and seals with the sealing of hole film.The pipeline of teflon material has good insulativity for all exhaust gas components of test methanol vehicle discharging, does not promptly adsorb carbon monoxide (CO), carbon dioxide (CO in the exhaust
2), hydrocarbon (HC), oxides of nitrogen (NO
X) and particle (PM) and formaldehyde (HCHO) gas, and silicone tube, sealing of hole film have improved sealing effectiveness, guarantee accuracy of experimental results.Because the magnitude of test car exhaust emissions amount is lower, if the test car tail gas that any a part of material is measured needs has adsorbability, perhaps system sealing is bad, will have a strong impact on the result of test, causes bigger error.
As preferably, on the pipeline between air pump and the sampler bag, be provided with solenoid valve.Be controlled at the suitable time respectively and pump into mixed on low speed gas and high-speed mixing gas by controlling two solenoid valves, thereby the exhaust emissions of different operation conditionss is tested, improve precision of test result to two sampler bags.
As preferably, be provided with breather valve in the bottom of sampler bag, sampler bag is connected with the formaldehyde sampling pump by breather valve.Open the gas valve of two sampler bag bottoms, by two pre-set formaldehyde sampling pumps of sampling parameter, extract two exhaust sample gas in the sampler bag respectively, gas is during by the sampling pipe in the formaldehyde sampling pump, sampling pipe adsorbs formaldehyde wherein, formaldehyde sampling pump parameter setting when the parameter setting of two formaldehyde sampling pumps is sampled with the basis is identical, guarantees consistance, improves accuracy of experimental results.
As preferably, described sample gas sampler bag is that two and specifications and models are identical, is connected in parallel on the air pump simultaneously; Described formaldehyde sampling pump is three, adopt formaldehyde sample pump setup parameter unanimity for three, one of them is a background gas formaldehyde sampling pump, and two other is connected with sampler bag respectively, one is the formaldehyde sampling pump of an exhaust of operation cycle, and another is the formaldehyde sampling pump of two exhausts of operation cycle.A sampler bag is collected the tail gas of test car low-speed running, and another sampler bag is collected the tail gas that test car runs up, and the mixed gas to two sampler bags carries out analyzing and testing respectively.
As preferably, described methanol vehicle adopts two cover separate fuel feed systems, and two overlap independently fuel system by the integrated control of electronic engine management system, and a kind of is methanol fuel feed system as the main fuel system; A kind of is only to be used to start and the gasoline or the diesel oil feed system of the auxiliary fuel system of meeting an urgent need, and the auxiliary fuel tank volume is not more than 15L.Wherein, the methanol fuel system is main feed system, and methanol fuel is a main fuel, is used for cruising and drives; Petrol system is a backup system, and gasoline is auxiliary fuel, is used for ignition trigger operating mode and emergent.
Therefore, the method of testing of emission of methanol automobile exhaust contaminant of the present invention and device thereof have following advantage: good formaldehyde sampling pump is gathered tail gas 1, to utilize parameter setting, adopt second fine then to scribbling 2, the sampling pipe of 4-dinitrophenylhydrazine carries out wash-out absorption, separation through chromatographic column, measure by high performance liquid chromatograph, can accurately measure the content of formaldehyde in the tail gas, the quality of the formaldehyde emissions in the automobile exhaust contaminant that calculates, the result of test can reach the dimension that discharges pollutants and come to the same thing with the automobile routine, is g/km; 2, be implemented in and gather, analyze carbon monoxide (CO), hydrocarbon (HC), oxides of nitrogen (NOX) and the conventional pollutant load of particle (PM) and the unconventional content that discharges pollutants of formaldehyde (HCHO) that discharges in the methanol vehicle tail gas in the same test cyclic process simultaneously, realized integrating with mutually, thoroughly solved existing in prior technology and can't accurately detect technical matters with quantitative evaluation for the formaldehyde emissions concentration in the vehicle exhaust with the conventional pollutant emission detection method of automobile.3, adopt the teflon plastic tube as connecting tube, and adopt silicone tube and sealing of hole film to seal, tail gas is connected with sampler bag by pipeline, can degree of enforcement height, simple in structure, and also the material of teflon plastic tube is good, do not adsorb the methanol vehicle exhaust gas component, improve the accuracy of test.4, this patent proving installation is simple and easy to do, and is easy to operate, detection method reliability height, test findings degree of accuracy height, the detection and the analytical calculation that can be used for gasoline car, diesel vehicle and use the Vehicular exhaust formaldehyde of other fuel.
Description of drawings:
Fig. 1 is the synoptic diagram of emission of methanol automobile exhaust contaminant method of testing of the present invention;
Fig. 2 is the synoptic diagram of emission of methanol automobile exhaust contaminant proving installation of the present invention.
Embodiment:
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
As shown in Figure 1, a kind of method of testing of emission of methanol automobile exhaust contaminant,
The first step, the preparation before doing experiment will be tested methanol vehicle and carry out pre-service, check its performance and state; Simultaneously the air in the testing laboratory is sampled, the formaldehyde sampling pump is placed on air cleaner in the testing laboratory after, set formaldehyde sampling pump flow velocity 400ml/min, sampling time 30min, sampling quantity 12L is to test airborne concentration of formaldehyde; The formaldehyde sampling pump is linked to each other with sampler bag, and sampler bag and exhaust gas sampling system connect, and to two sampler bag extracting vacuum, carry out sealing and detect, and guarantee that sample gas does not have leakage.
In second step, on-test,, low speed urban district operation cycle is carried out in the entry into service on chassis dynamometer of test methanol vehicle earlier, carries out high speed suburbs operation cycle then.Behind the engine start, begin low speed urban district operation cycle immediately.Low speed urban district operation cycle and high speed suburbs operation cycle all comprise the operating mode of idling, deceleration, throw-out-of clutch, gear shift, acceleration, constant speed, deceleration.Low speed urban district operation cycle duration of test average speed is 19km/h, and effectively running time is 195s; High speed suburbs operation cycle duration of test average speed is 62.6km/h, and effectively running time is 400s.
The 3rd step, test gas is gathered, after the tail gas of motor vehicle emission dilutes by air in second step, the test methanol vehicle is input in the sampler bag 11 in the exhaust of low speed urban district operation cycle collects, test car is input in the sampler bag 12 in the exhaust of high speed suburbs operation cycle and collects.The volume of two sampler bags is 100L.
The 4th step, the operation cycle of test methanol vehicle on chassis dynamometer finishes, the normally gaseous pollutant analysis instrument of waste gas utilization in the sampler bag is carried out online detection, and the conventional emission of normally gaseous pollutant analysis instrument analysis comprises: carbon monoxide (CO), carbon dioxide (CO2), hydrocarbon (HC), oxides of nitrogen (NOX) or particle (PM);
The 5th step, after conventional exhaust contaminant analysis finishes, close valve with conventional exhaust contaminant analytical equipment, open the gas valve that is connected with the formaldehyde sampling pump, with formaldehyde sampling pump 13 and the formaldehyde sampling pump 14 that parameter configures in advance, begin to gather the test sample gas in sampler bag 11 and the sampler bag 12 simultaneously.Sampling pipe in the sampling pump scribbles 2,4 dinitrophenyl hydrazine, but PARA FORMALDEHYDE PRILLS(91,95) adsorbs; Sampling is carried out wash-out with second is fine to the sampling pipe that has adsorbed formaldehyde after finishing, through the separation of chromatographic column, measures by high performance liquid chromatograph, thus the concentration of analysis absorbing formaldehyde;
In the 6th step, utilize formula M
HCHO=V
Mix* C
HCHO/ d calculates the discharge quality of formaldehyde pollutant, wherein M
HCHOThe discharge quality of expression formaldehyde pollutant, unit is g/km; V
MixThe volume of expression diluted exhaust, proofreading and correct to standard state is 273.2K and 101.33kPa, unit is L; C
HCHOConcentration of formaldehyde in the expression diluted exhaust is promptly analyzed concentration of formaldehyde by above-mentioned high performance liquid chromatograph; Unit is g/L; D represents that distance that vehicle is travelled when testing by operation cycle is the distance of test methanol vehicle low speed urban district operation cycle and high speed suburbs operation cycle on chassis dynamometer, and unit is km.Sampling charges into nitrogen after finishing in sampler bag, airbag is washed.
As shown in Figure 2, the proving installation of the emission of methanol automobile exhaust contaminant of corresponding above-mentioned method of testing comprises the methanol vehicle 1 of test, chassis dynamometer 2, exhaust gas sampling system 3 and exhaust gas collection analytic system 4.Methanol vehicle possesses two and overlaps independently fuel feed system, i.e. methanol fuel feed system and gas supply system, and by the work of two kinds of fuel of the cover integrated control of electronic engine management system.Wherein, the methanol fuel system is main feed system, and methanol fuel is a main fuel, is used for cruising and drives; Petrol system is a backup system, and gasoline is auxiliary fuel, be used for ignition trigger operating mode and emergent, and gasoline tank capacity is not more than 15L.Test methanol vehicle 1 is positioned on the chassis dynamometer 2, the gas outlet of test methanol vehicle 1 is connected with exhaust gas sampling system 3, exhaust gas sampling system 3 comprises the gas collection conduit 5 of joining with gas outlet, on gas collection conduit 5, be connected with air access tube 6, air enters air access tube 6 via air cleaner 16, gas in gas collection conduit 5 and the air access tube 6 mixes mutually in mixed air vessel 7, mixed air vessel 7 is connected with air pump 8, air pump 8 is connected exhaust gas collection analytic system 4 by low-speed running round-robin solenoid valve 9 with the round-robin solenoid valve 10 that runs up, and is provided with temperature controller 18 between air pump and the solenoid valve; Exhaust gas collection analytic system 4 comprises low-speed running round-robin sampler bag 11 that links to each other with low-speed running round-robin solenoid valve 9 and the round-robin sampler bag 12 that runs up that links to each other with the round-robin solenoid valve 10 that runs up, be connected with normally gaseous pollutant analysis instrument 17 on sampler bag 11 and the sampler bag 12, sampler bag 11 is connected with formaldehyde sampling pump 13, and sampler bag 12 is connected with formaldehyde sampling pump 14.During off-test behind the normally gaseous pollutant of online detection, open the gas valve that is connected with formaldehyde sampling pump 14 with formaldehyde sampling pump 13, sampler bag 11 is connected with formaldehyde sampling pump 14 with formaldehyde sampling pump 13 respectively by breather valve with sampler bag 12, described formaldehyde sampling pump 13 and formaldehyde sampling pump 14 carry out setup parameter before test, after test methanol vehicle operation cycle finishes, open the gas valve of two airbag bottoms, by two pre-set formaldehyde sampling pumps of sampling parameter, extract two exhaust sample gas in the airbag respectively, gas is during by the sampling pipe in the sampling pump, sampling pipe adsorbs formaldehyde wherein, and the gas of the sampling pipe absorption in the formaldehyde sampling pump is measured by high performance liquid chromatograph 15.Solenoid valve is two, and the test methanol vehicle by the control of solenoid valve, is respectively the sampler bag input discharge tail gas of 100L to volume when carrying out operation cycle.Connecting pipe between formaldehyde sampling pump and sampler bag, sampler bag and the sampling of auto exhaust system is the teflon plastic tube, and the teflon plastic tube all adopts silicone tube to be connected with the connectivity port of formaldehyde sampling pump, sampler bag, exhaust gas sampling system and seals with the sealing of hole film.
Claims (10)
1. the method for testing of an emission of methanol automobile exhaust contaminant, it is characterized in that: at first the PARA FORMALDEHYDE PRILLS(91,95) sampling pump carries out parameter setting, and testing laboratory's air is carried out basic background sampling; Then to the sealing of sampler bag extracting vacuum with the check sampling system; To test methanol vehicle then turns round on chassis dynamometer, in the operation cycle process, the methanol vehicle exhaust collection is got up, and use air that the tail gas of collecting is carried out serial dilution and mixing, according to the different operation cycle situation of test methanol vehicle, the gas that mixes is imported in the corresponding sampler bag; After test methanol vehicle operation cycle finishes, carry out the check and analysis of conventional exhaust contaminant earlier, after analysis is finished, carry out the sampling analysis of formaldehyde exhaust contaminant again; The sampling analysis of described formaldehyde exhaust contaminant is to open parameter setting earlier good formaldehyde sampling pump is gathered the gas in the sampler bag, and the sampling pipe in the sampling pump scribbles 2,4 dinitrophenyl hydrazine, but PARA FORMALDEHYDE PRILLS(91,95) adsorbs; Sampling is carried out wash-out with second is fine to the sampling pipe that has adsorbed formaldehyde after finishing, through the separation of chromatographic column, measures by high performance liquid chromatograph, thus the concentration of analytical calculation absorbing formaldehyde.
2. the method for testing of emission of methanol automobile exhaust contaminant according to claim 1 is characterized in that: after obtaining the concentration of absorbing formaldehyde, and according to its concentration by volume and sample gas total measurement (volume), and formaldehyde gas density under standard state, by formula: M
HCHO=V
Mix* C
HCHO/ d calculates the discharge quality of formaldehyde pollutant, wherein M
HCHOThe discharge quality of expression formaldehyde pollutant, unit is g/km; V
MixThe volume of expression diluted exhaust is proofreaied and correct to standard state 273.2K and 101.33kPa, and unit is L; C
HCHOConcentration of formaldehyde in the expression diluted exhaust, unit is g/L; D represents the distance that vehicle is travelled when testing by operation cycle, and unit is km.
3. the method for testing of emission of methanol automobile exhaust contaminant according to claim 1, it is characterized in that: described conventional exhaust contaminant analysis is online check and analysis, the analysis of formaldehyde exhaust contaminant is the offline inspection analysis, after conventional exhaust contaminant analysis finishes, close the valve that is connected with conventional exhaust contaminant analytical equipment, open the gas valve that is connected with the formaldehyde sampling pump and carry out the check and analysis of formaldehyde exhaust contaminant.
4. the method for testing of emission of methanol automobile exhaust contaminant according to claim 1, it is characterized in that: formaldehyde sampling pump sampling capacity is 12L, and sampling flow is set at 400mL/min, the sampling time is set 30min.
5. the proving installation of an emission of methanol automobile exhaust contaminant is characterized in that:
Comprise test methanol vehicle, chassis dynamometer, exhaust gas sampling system and exhaust gas collection analytic system;
Described test methanol vehicle is positioned on the chassis dynamometer, and the gas outlet of test methanol vehicle is connected with the exhaust gas sampling system by pipeline;
Described exhaust gas sampling system comprises the gas collection conduit of joining with gas outlet, on the gas collection conduit, be connected with the air access tube, gas in gas collection conduit and the air access tube mixes mutually in mixed air vessel, and mixed air vessel is connected with air pump, connects the exhaust gas collection analytic system on the air pump;
Described exhaust gas collection analytic system comprises the sampler bag that links to each other with air pump, described sampler bag is connected with normally gaseous pollutant analysis instrument and formaldehyde sampling pump simultaneously, described formaldehyde sampling pump carries out setup parameter before test, the sampling pipe absorbing formaldehyde gas in the formaldehyde sampling pump is also measured by high performance liquid chromatograph.
6. the proving installation of emission of methanol automobile exhaust contaminant according to claim 5, it is characterized in that: the connecting pipe between described formaldehyde sampling pump and sampler bag, sampler bag and the sampling of auto exhaust system is the teflon plastic tube, and the teflon plastic tube is connected with silicone tube with the connectivity port of formaldehyde sampling pump, sampler bag, exhaust gas sampling system and seals with the sealing of hole film.
7. according to the proving installation of claim 5 or 6 described emission of methanol automobile exhaust contaminant, it is characterized in that: on the pipeline between air pump and the sampler bag, be provided with solenoid valve.
8. according to the proving installation of claim 5 or 6 described emission of methanol automobile exhaust contaminant, it is characterized in that: the bottom at sampler bag is provided with breather valve, and sampler bag is connected with the formaldehyde sampling pump by breather valve.
9. according to the proving installation of claim 5 or 6 described emission of methanol automobile exhaust contaminant, it is characterized in that: described sample gas sampler bag is that two and specifications and models are identical, is connected in parallel on the air pump simultaneously; Described formaldehyde sampling pump is three, three formaldehyde sampling pump setup parameter unanimities, one of them is a background gas formaldehyde sampling pump, two other is connected with sampler bag respectively, one is the formaldehyde sampling pump of an exhaust of operation cycle, and another is the formaldehyde sampling pump of two exhausts of operation cycle.
10. according to the proving installation of claim 5 or 6 described emission of methanol automobile exhaust contaminant, it is characterized in that: described methanol vehicle adopts two cover separate fuel feed systems, and two overlap independently fuel system by the integrated control of electronic engine management system, and a kind of is methanol fuel feed system as the main fuel system; A kind of is only to be used to start and the gasoline or the diesel oil feed system of the auxiliary fuel system of meeting an urgent need, and the auxiliary fuel tank volume is not more than 15L.
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