COMPARATIVE ANALYSIS OF GAS EMISSIONS FROM A VEHICLE RUNNING ON GASOLINE AND ETHANOL
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1 COMPARATIVE ANALYSIS OF GAS EMISSIONS FROM A VEHICLE RUNNING ON GASOLINE AND ETHANOL Raphael Araújo de Holanda, raphaelholanda@hotmail.com 1 Gil Colona Laranja, gil@ctgas.com.br 1 Cleiton Rubens Formiga Barbosa Junior, cleitonformiga@gmail.com 1 Francisco de Assis Oliveira Fontes, franciscofontes@uol.com.br 1 Cleiton Rubens Formiga Barbosa, cleiton@ufrnet.br 1 1 Federal University of Rio Grande do Norte, Nucleus of Industrial Technology, Laboratory for Energy, Natal, Brazil, Abstract: It is known that the transport sector has a fundamental importance to the modern society, once the economic development is directly linked to mobility. Over the years, the transport became linked to different environmental problems, among them, can be detached greenhouse gases emissions in the atmosphere, where in recent decades can be perceived the intensification and targeting of efforts in research and development of new technologies to reduce the levels of greenhouse gases emissions in the atmosphere. In this context, it can be highlighted the modern systems of electronic engine management, new automotive catalysts and the use of renewable fuels which contribute to reducing the environmental impact. This research had as its purpose the analysis of fuels characteristics used for testing, comparative analysis of gas emissions from a motor vehicle running on gasoline or ethanol according to NBR 6601 and conducting tests to estimate the maximum catalytic efficiency. For the implementation of trial, a flex vehicle, powered with 4 cylinders totaling 1.4 cc, was installed in a chassis dynamometer equipped with a gas analyzer, in order that before the completion of the urban driving cycle, were determined levels of hydrocarbon corrected (HC corr ), carbon monoxide corrected (CO corr ), carbon dioxide (CO 2 ) and residues of oxygen (O 2 ) present in the gaseous emissions. The research concluded that: the performance analysis for characterization of fuel showed consistent with National Agency of Petroleum, Natural Gas and Biofuels (ANP) specifications; after tests performances, it can be stated that gasoline was the fuel which had the highest average level of hydrocarbon corrected and residues of oxygen, while that the average level of carbon monoxide corrected and carbon dioxide, because of the accuracy of the gas analyzer, it was not possible to say among gasoline and ethanol, which of the two fuels generated higher concentration; before a comparative analysis, the vehicle catalyst showed the best performance for reduction of level of hydrocarbon corrected present in exhaustion gases when it worked with gasoline and showed maximum efficiency of 100% to reduction of level of carbon monoxide corrected for both fuels. Before this, it can be stated that the vehicle catalyst showed satisfactory performance, achieving good reduction levels of greenhouse gases emissions. Keywords: gas emissions, gasoline, ethanol, NBR 6601, catalytic efficiency 1. INTRODUCTION It is well known that for a long time the transport sector has had a fundamental importance to global society, once economic development is directly related to the mobility of people and merchandises, and vehicles are the most used means of transportation until this day. Over the time, there has been an increase in the number of vehicles circulating daily in the world and therefore, the growth in greenhouse gases emission released into the atmosphere, as the result of the combustion process inside the motor vehicle. Along with this scenario, it is observed, in recent decades, the search for improvements to answer these requirements, leading to the intensification of efforts in research and development of new technologies, which will promote the reduction of the greenhouse gases emission levels in the atmosphere. In this context, it can be highlighted the modern systems of electronic engine management, new automotive catalysts and the use of renewable fuels that contribute to reducing emission levels of greenhouse gases into the atmosphere. This part is reinforced by the increasing discovery of many renewable fuels, considered clean fuels. For some time vehicles have been equipped with devices that allow them to use different types of fuels to promote a greater saving and reducing the emission levels coming from internal combustion process in engines, in a way to attend the legislation requirements and therefore the preservation of the environment. This research shows the results of the analysis for the characterization of fuels used in the execution of the tests, the comparative analysis of gaseous emissions from a light automotive road vehicle, powered with 4 cylinders in line
2 totaling 1.4 cc, running on gasoline and ethanol and the measurement of the catalyst efficiency of the vehicle in the reduction process of the levels of hydrocarbon corrected (HCcorr) and carbon monoxide corrected (COcorr) of each fuel used. The tests were performed with vehicle over a chassis dynamometer in accordance with the test procedures contained in the Brazilian standard NBR 6601, which defines the parameters for performing the emissions test for the urban driving cycle. 2. DEVELOPMENT 2.1. Description of the vehicle used in the tests The vehicle used for the performance of the route of driving on urban traffic cycle is a flex-fuel vehicle. Some features such as identification, motorization, power supply system, transmission and clutch, which are detailed below: The vehicle is a light automotive road vehicle, identified by the plate NNM 3745 and chassis number 9BD17201XA The vehicle has motorization with four cylinders in line, two valves per cylinder, engine capacities totaling 1,396 (cc) and in Table 1 there are other additional informations: Table 1. Other informations regarding the vehicle engine used for testing Fuel Gasoline Ethanol Compression ratio Maximum power (cv/kw/rpm) 80 / 58.9 / / 59.6 / 5500 Maximum torque (kgfm/nm/rpm) 12.2 / / / 121,6 / 2250 Idling speed (rpm) The vehicle used in the tests was a flex-fuel vehicle that can be powered by up to four different types of fuel: Gasoline without adding anhydrous alcohol (NAFTA), gasoline with anhydrous alcohol (Brazilian Gasoline), hydrated alcohol (ethanol) and compressed natural gas (CNG). By using any of the fuels mentioned, the electronic system that manages the power of the motor, automatically makes the necessary adjustments for the engine to suit the fuel in use. The vehicle has a differential incorporated to the gear boxes, front-wheel drive with constant velocity joints and it follows the transmission ratio versus speed limit as shown below: 2.2. Gas Analyzer Table 2. Gear ratio for speed limit according to manufacturer manual Fuel Gasoline Ethanol 1st gear nd gear rd gear th gear th gear Reverse gear 40.0 The gas analyzer applied to the tests was used to determine the concentrations of hydrocarbons, carbon monoxide, carbon dioxide and oxygen through the electrochemical cell. The exhaust gas samples were collected in real time with the support of the probe for aspiration of gases, to determine the concentrations in emission test, data was collected after and before the catalyst for maximum catalytic efficiency test: For correct operation, the gas analyzer must operate in the temperature range of 5 C to 48 C, relative humidity up to 90% non-condensing and atmospheric pressure ranging from 750 mbar to 1100 mbar. Below are some characteristics of the equipment regarding its measurement range and accuracy. Table 3. Measuring range of the gas analyzer Gas Minimum Maximum Hexane 0 20,000 ppm volume Propane 0 40,000 ppm volume CO 0 10 % VOL CO % VOL O % VOL
3 Rotation ,000 RPM Temperature -10 C 140 C 2.3. Gasoline and ethanol Table 4. Accuracy of the gas analyzer Gas Accuracy HC 4 ppm volume HC CO 0.02 % VOL CO CO % VOL CO 2 O % VOL O 2 The gasoline and ethanol total characterization analysis had the physical structure of the Fuels and Lubricants Laboratory of Federal University of Rio Grande do Norte (LCL - UFRN): 2.4. Test procedure emissions A procedure was elaborated to conduct the emissions testing under simulated conditions of normal use average in urban traffic based on the guidelines of NBR 6601, which prescribes the method for the determination of hydrocarbons, carbon monoxide, and carbon dioxide, emitted by the engine through the discharge tube of a lightweight road vehicle. The emissions test consists basically of determining concentrations of hydrocarbons, carbon monoxide and carbon dioxide from the collection of emissions with the gas analyzer, while the vehicle performs a path of pre-established driving cycle coordinates, for such it is necessary to use the chassis dynamometer to simulate running actual conditions on a runway. The emission test cycle in urban chassis dynamometer consists of two distinct parts: cold start and warm start, with a break of 10 minutes ± 1 minute between them. Elaborated procedure for conducting the tests: execution of test to determine emissions of hydrocarbons, carbon monoxide, carbon dioxide and oxygen in a Flex-fuel model vehicle, using driving cycles developed in chassis dynamometer, which simulates vehicle in urban traffic using the fuel gasoline and ethanol, for such the dynamometer had to be fed with the following variables: Equivalent inertia corresponding to the total weight of the vehicle: 1,304 kg Aerodynamic drag of the vehicle, which is: 4.5 kw Resistive power of chassis dynamometer, which is: 0.3 kw Cold start The cold start cycle requires 1371 s (22 minutes and 51 seconds) to be fully finished, having travelled a distance of approximately 12.1 km, this cycle is divided into two phases. The first phase, representing the "transitory" phase of cold start, lasts for 505 seconds (8 minutes and 25 seconds) and travels a distance of approximately 5.78 km. The second phase, representing the "stabilized" phase, is the conclusion of the test cycle, which lasts for 866 seconds (14 minutes and 26 seconds), and travels a distance of approximately 6.32 km, ending with the engine shutdown Warm start Similarly, the cycle of warm start is divided into two phases. The first phase, representing the "transitory" phase from the warm start, lasts for 505 seconds (8 minutes and 25 seconds) and travels a distance of approximately 5.78 km, while the second phase of the warm start cycle, representing the "stabilized" phase is identical to the second phase of the cold start cycle, therefore, the test is not run, but the values obtained in stabilized cold start phase are considered Coordinates of urban driving cycle The driving cycle on chassis dynamometer to simulate driving conditions in urban areas is defined by a continuous graph of speed versus time. It consists of non repeated sequences of slow running system, acceleration, cruising speeds and decelerations in magnitudes and varied combinations. The coordinates of this driving cycle are specified in Table B.1 of Annex B of NBR Adequation of urban cycle coordinates So that the proposed route by NBR 6601 could be performed, an adequation of the coordinates was made, according to the margin of tolerance on speed limits, which are allowed by this standard. This adequation in the
4 coordinates was necessitated by the absence of an electronic speed control system for the realization of the route proposed by the standard Adequation Cold start After appropriate adequations, the new cycle of cold start requires 1371 s (22 minutes and 51 seconds) to be fully invested travelling a distance of approximately km, this cycle is divided into two phases. The first phase, representing the "transitory" phase of cold start, lasts for 505 seconds (8 minutes and 25 seconds) and travels a distance of approximately 5.62 km. The second phase, representing the "stabilized" phase, is the conclusion of the test cycle, which lasts for 866 seconds (14 minutes and 26 seconds), and travels a distance of approximately 5.95 km, ending with the engine shutdown Adequation Warm start Similarly, the new cycle of warm start is divided into two phases. The first phase, representing the "transitory" phase from the warm start, which lasts for 505 seconds (8 minutes and 25 seconds) and travels a distance of approximately 5.62 km, while the second phase of the warm start cycle, representing the "stabilized" phase is identical to the second phase of the cold start cycle, therefore, the test is not run, but the values obtained in the stabilized cold start phase are considered. Fig. 1. Graphic with the coordinates of urban cycle of emissions Calculation of the levels hydrocarbon corrected and of carbon monoxide corrected Formula to calculate the catalytic efficiency for hydrocarbon corrected The level of hydrocarbon corrected, which is provided in ppm by volume, is calculated from the formula HC 15 Corrected = HC ( CO measured CO * + 2 measured ) measured, (1) Formula to calculate the catalytic efficiency for carbon monoxide corrected The level of carbon monoxide corrected, which is provided in ppm by volume, is calculated from the formula
5 CO 15 Corrected = CO measured ( CO measured CO ) * + 2 measured, (2) Calculation of the maximum catalytic efficiency It was performed, as extra information, a comparative analysis in a given instant for gas emissions collected before and after the catalyst of the vehicle, which resulted in the maximum catalytic efficiency of the catalyst used Formula to calculate the catalytic efficiency for hydrocarbon corrected The percentage of catalytic efficiency for hydrocarbon corrected is calculated from the following formula: HC after Efficiency Catalytic = 100 * 100, (3) HC HC before Formula to calculate the catalytic efficiency for carbon monoxide corrected The percentage of catalytic efficiency for carbon monoxide corrected is calculated from the following formula: CO after Efficiency Catalytic = 100 *100, (4) CO CO before 2.5. Results and discussion Next are the results of total characterization analysis of the gasoline and ethanol at the LCL - UFRN. Also shown are the results of tests conducted at the LMA - CTGÁS-ER, where emissions were registered during the performance of urban cycle, these results are shown in graphics that illustrate the behavior of the magnitudes involved in this study: the levels of hydrocarbons corrected, carbon monoxide corrected, carbon dioxide and residues oxygen for each of the fuels used. It is still presented, as extra information, the results obtained for maximum catalytic efficiency in a given moment, when the catalyst is submitted to the operation with each of the used fuels Results obtained from the analysis of fuels used The execution of the total characterization analysis of the gasoline and ethanol used in this paper was supported by technical team and physical infrastructure of LCL UFRN and their results are shown in Table 6: Table 6. Results of the analysis of gasoline and ethanol Technical Features Gasoline Ethanol Aspect Clear and free of impurities Clear and free of impurities Color Yellow Color less Density (kg/m 3 ) measured at 20 C Alcoholic content ( INPM) Electric conductivity (µs/m) Hydrogenionic potential (ph) AEAF content (% vol) 25 - Motor Octane Number - MON Research Octane Number - RON Antiknock index Benzene Aromatics Olefins Saturated Distillation ( C) - start point Distillation ( C) - 10% of recovered Distillation ( C) - 50% of recovered Distillation ( C) - 90% of recovered Distillation ( C) - End point
6 Distillation ( C) - Residue Both the result of the analysis of the total sample characterization of gasoline and ethanol are in compliance with the specifications of the National Petroleum, Natural Gas and Biofuels Agency (ANP), having been deemed approved for use in the tests Conducting tests of urban cycle To perform the driving cycle of urban traffic test, it was necessary to make adequations in the guidelines of the NBR 6601, these adjustments were made taking into account the velocity margin of tolerance which is permitted by regulation, to make possible the execution of the coordinates of urban cycle compliance. The tests to determine emissions were performed in accordance with the standard, which sets the methodology for the simulation of driving a vehicle in urban traffic in chassis dynamometer using coordinates of speed versus time. Items to show the results of the levels of the hydrocarbon corrected, carbon monoxide corrected, carbon dioxide and residues of oxygen, all present in the emissions from the combustion of gasoline and ethanol during the driving cycle urban traffic Result of the level hydrocarbon corrected From the results obtained in the analysis of exhaust gases during the testing of emissions driving in urban cycle traffic with flexible-fuel vehicles running on gasoline or ethanol, it was performed a comparative analysis of the average amount of level of hydrocarbon corrected present in these gas emissions. Fig. 2. Graphic with the result of analysis of level hydrocarbon corrected. Of the analyzed fuels, gasoline was which generated the highest average level of hydrocarbon corrected present in gas emissions with ppm volume, while ethanol generated ppm volume Result of the level carbon monoxide corrected Based on the results obtained by exhaust gases analysis during test emissions driving in urban cycle traffic with flexible-fuel vehicles running on gasoline or ethanol, it was performed a comparative analysis of the average amount of level of carbon monoxide corrected present in these gas emissions.
7 Fig. 3. Graphic with the result of analysis of level carbon monoxide corrected. Of the analyzed fuels, was not possible establish which was what generated the highest average level of carbon monoxide present in the corrected emissions, because the ethanol generated percent volume and gasoline generated percent volume and knowing precision gas analyzer, which is percent volume for the measurement of carbon monoxide, it was not possible to say among gasoline and ethanol, which of the two fuels generated higher concentration of carbon monoxide Result of the level carbon dioxide Based on the results obtained of exhaust gases analysis during test emissions driving in urban cycle traffic with flexible-fuel vehicles running on gasoline or ethanol, it was performed a comparative analysis of the average amount of level of carbon dioxide present in these gas emissions. Fig. 4. Graphic with the result of analysis of level carbon dioxide.
8 Of the analyzed fuels, was not possible establish which was what generated the highest average level of carbon dioxide present in the corrected emissions, because the ethanol generated percent volume and gasoline generated percent volume and knowing precision gas analyzer, which is percent volume for the measurement of carbon dioxide, it was not possible to say among gasoline and ethanol, which of the two fuels generated higher concentration of carbon dioxide Result of the level of residues of oxygen Starti ng with the results obtained by exhaust gas analysis during emission tests driving in urban cycle traffic with flexible-fuel vehicles running on gasoline or ethanol, it was performed a comparative analysis of the average amount of level of residues of oxygen present in these gas emissions. Fig. 5. Graphic with the result of analysis of level of residues of oxygen. Of the analyzed fuels, gasoline was which generated the highest average level of residues of oxygen present in gas emissions with 2.85 percent volume, while ethanol showed 2.49 percent volume Result of the calculate the catalytic efficiency The analysis of test results when the vehicle is submitted to operation in slow running with each one of the fuels used are shown in Table 7: Table 7. Results of maximum catalytic efficiencies at a given instant Fuel Level Hydrocarbon Corrected (%) Level Carbon Monoxide Corrected (%) Gasoline Ethanol Starting with the point measurements of the exhaust gases before and after the catalyst, an estimate of the maximum efficiency catalytic operating with gasoline or ethanol was calculated, showing the best catalytic efficiency to reduce level of hydrocarbon corrected present in exhaust gases when the vehicle ran on gasoline with 90.00% efficiency, while ethanol reached 47.00% of efficiency. To reduce level of concentrations carbon monoxide corrected, the efficiency was % and equal for both fuels. 3. CONCLUSION The values obtained for total characterization analysis of the gasoline and ethanol, held at LCL - UFRN, are in accordance with the specifications of National Petroleum, Natural Gas and Biofuels Agency (ANP), having been considered approved for use in the tests.
9 The experimental methodology adopted in the emission tests complied with the proposed objectives, enabling the achievement of conclusive results about emission levels of the vehicle running on different fuels. The results obtained from the emissions recorded during the performance of urban cycle route showed, in a comparative analysis, that the average level of hydrocarbon corrected and residues of oxygen were the biggest for gasoline, while that the average level of carbon monoxide corrected and carbon dioxide, because of the accuracy of the gas analyzer, it was not possible to say among gasoline and ethanol, which of the two fuels generated higher concentration. The automotive catalyst showed the best maximum catalytic efficiency for the reduction of level of hydrocarbon corrected when the vehicle ran on gasoline. The result for the reduction of level of carbon monoxide corrected was 100% for both fuels. 4. REFERENCES ABNT, Light Road Vehicles e Determination of Hydrocarbons, Carbon Monoxide, Oxides of Nitrogen, Carbon Dioxide and Particulate Matter in the Exhaust Gas, NBR 6601 Standard. Brazilian Association of Technical Standards, Brazil. Bata M.R., Alternate Fuels, A decade of Success and Promise. Morgantown, WV: West Virginia University; Bosch, Automotive electric/electronic systems. 2nd edition. Warrendale, PA; Bosch, Handbook of Automotive Technology. Publisher Blucher; Branco S.M. and Murgel E., Air pollution. São Paulo, SP: Publisher Moderna; Degobert P., Automobiles and Pollution, Society of Automotive Engineers. Warrendale, PA: Institut Français du Pétrole Publications; Fernandes, C.S., Statistical Analysis of CO and HC Emissions Produced by Vehicular Exhaust Gases from Gasoline, CNG and Alcohol/Gasoline Blend [dissertation]. Federal University of Rio Grande do Norte, Natal, RN, Brazil. Fernandes, C.S., Barbosa C.R.F. and Fontes F.A.O. Statistical analysis of CO and HC from gasoline engines, CNG and gasoline/alcohol blend. Campina Grande, PB: VI National Congress of Mechanical Engineering; F.I.A.T., Supplement Siena Tetrafuel; Hansen M., Proposition of a method for evaluation of additional vehicular emissions in cold starting [dissertation]. Porto Alegre, RS: University of Rio Grande do Sul; Heywood J. B., Internal Combustion Engine Fundamentals. New York: McGraw-Hill; Holanda R.A., Analysis of gaseous emissions from a vehicle flex running with different fuels [dissertation] Rio Grande do Norte, RN: State University Rio Grande do Norte, RN Leite, B.E., Experimental Analysis of the Overall Efficiency of an Engine with Tetra Fuel System Operating with Different Fuels [dissertation]. Federal University of Campina Grande, Campina Grande, PB, Brazil; Loiola, B.R., Silva, E.C.M., Brollo, G.L. and Tomazini, R.B., Analysis of pollutant emissions from flex engines at automobile exhaust. Environ. Sci. Mag. 7, 1e6; Martins A.A., Rocha R.A.D., Sodré J.R., Cold start and full cycle emissions from a flexible fuel vehicle operating with natural gas, ethanol and gasoline, Journal of Natural Gas Science and Engineering, Vol. 17, 2014, Pages 94-98, ISSN Resolution Nº 6 - This Technical Regulation applies to Automotive Gasoline used as a standard in testing fuel consumption and vehicle emissions. ANP; Resolution Nº 23 - This Technical Regulation applies to anhydrous ethanol fuel of reference and hydrous ethanol fuel of reference, national or imported, to be used in testing of evaluating fuel consumption and vehicle emissions for approval of motor vehicles. ANP, Ribeiro S. K., Costa C. V., David E. G., Real M. V., D agosto M. A., Transportation and climate change. Rio de Janeiro, RJ: MAUAD; Russo P. R., Atmospheric pollution: reflecting on environmental quality in urban areas. Rio de Janeiro, RJ; Tecnomotor, Operation Manual - Gas Analyzer TM 131, 1st edition; RESPONSIBILITY NOTICE The author(s) is (are) the only responsible for the printed material included in this paper.
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