PERFORMANCE AND EMISSION CHARACTERISTICS OF MAHUA BIODIESEL IN A DI- DIESEL ENGINE
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1 International Journal of Mechanical Engineering and Technology (IJMET) Volume 6, Issue 11, Nov 215, pp , Article ID: IJMET_6_11_15 Available online at ISSN Print: and ISSN Online: IAEME Publication PERFORMANCE AND EMISSION CHARACTERISTICS OF MAHUA BIODIESEL IN A DI- DIESEL ENGINE Chaitanya P Junior Lecturer, Government Vocational Junior College, Visakhapatnam, Andhra Pradesh, India P. V. Rao Associate Professor, Dept. of Mechanical Engineering, Andhra University, Visakhapatnam, Andhra Pradesh, India A. Swarna Kumari Professor, Dept. of Mechanical Engineering, Jawaharlal Nehru Technological University Kakinada, Andhra Pradesh, India. ABSTRACT This work is focused to determine the performance and emissions characteristics of a naturally aspirated direct ignition diesel engine fueled with diesel fuel (DF), mahua biodiesel (MBD) and preheated mahua biodiesel (MBD-PH). The fatty acid composition of MBD is determined and its properties like density, viscosity, cetane number, calorific value and iodine value are also determined. Engine performance tests showed that brake specific fuel consumption of MBD is higher than that of DF. The emission results from experimentations supported that MBD has substantially decreased the carbon monoxide, hydrocarbons, nitrogen oxides and smoke emissions. It is observed that MBD-PH has further reduced the emissions. Thus, mahua biodiesel can be used as an alternative fuel in automotive diesel engines. Key words: Emissions, Performance, Mahua Biodiesel, Fatty Acid Composition, Properties. Cite this Article: Chaitanya P, P. V. Rao and A. Swarna Kumari. Performance and Emission Characteristics of Mahua Biodiesel In A DI- Diesel Engine, International Journal of Mechanical Engineering and Technology, 6(11), 215, pp editor@iaeme.com
2 Performance and Emission Characteristics of Mahua Biodiesel In A DI- Diesel Engine 1. INTRODUCTION Burning of fossil fuels poses a strong threat to our environment as it emits harmful gases like carbon dioxide (CO 2 ), carbon monoxide (CO), Sulfur oxides (SOx), and Nitrogen oxides (NOx) [1]. Several studies [2] have shown that diesel and biodiesel blends reduce smoke opacity, particulates, un-burnt hydrocarbons, carbon dioxide and carbon monoxide emissions, but nitrous monoxide emissions have slightly increased. The brake power of biodiesel was nearly the same as with petrodiesel, while the specific fuel consumption was higher than that of petrodiesel [3]. Biodiesel is referred as mono-alkyl esters of long-chain-fatty acids made from renewable lipid sources (vegetable oils, or animal fats) by a trans- esterification chemical reaction. Advantages of biodiesel include domestic origin, renewability, biodegradability, higher flash point, inherent lubricity, reduction of most regulated exhaust emissions, as well as miscibility with petrodiesel. Several scientists [4-12] have investigated the effects of biodiesel fuel on exhaust emissions, and found a significant reduction in carbon monoxide, sulfur, smoke, particulate matter and noise emissions. 2. MAHUA OIL The inedible oil extracted from seeds of mahua as shown in figure 1, is the resource for the production of biodiesel which is abundantly available in India. It has a carbon chain between C 14 and C 24. It has a very high viscosity, and density. Different methods are being used to reduce the viscosity of oils such as pyrolysis, cracking and transesterification. Figure 1 Mahua oil Seeds 2.1. Transesterification In a transesterification reaction, one mole of triglyceride reacts with three moles of alcohol (molar ratio of methanol to vegetable oil of 3:1) to form one mole of glycerol and three moles of the respective fatty acid alkyl esters. The process is a sequence of three reversible reactions, in which the triglyceride molecule is converted step by step into diglyceride, monoglyceride and glycerol. The process of transesterification removes glycerin from the triglycerides and replaces it with the alcohol used for the conversion process. This process decreases the viscosity but maintains the cetane number and the heating value. MBD has a higher cetane number than diesel fuel, no aromatics, no sulfur, and contains 1 11 % oxygen by weight [13]. 3. FUEL PROPERTIES 3.1. Fatty Acid Composition of Mahua Biodiesel Fatty acid esters are composed of two building blocks, the fatty acid chain and the alcohol. Therefore, both these moieties in fatty esters influence fuel properties and editor@iaeme.com
3 Chaitanya P, P. V. Rao and A. Swarna Kumari varying one or both of them can lead to a change in fuel properties. For biodiesel, this issue is rendered more complicated because its fatty ester composition reflects the fatty acid profile of the feedstock used for its production. The fatty acid composition of MBD is as shown in Table 1. It has a carbon chain between C 14 to C 24. Table 1 Fatty acid Composition of Mahua Biodiesel Fatty Acid Name Carbon Number Composition % Myristic C14: 1. Palmitic C16: 23. Stearic C18: 19. Oleic C18:1 53. Linoleic C18:2 3. Linolenic C18:3.1 Arachidic C2:.4 Behenic C22:.15 Lignoceric C24: Physical and Chemical Properties of Mahua Biodiesel The physicochemical properties of MBD and DF are tabulated in Table Viscosity The viscosity is a measure of the internal friction or resistance of a substance to flow. As the temperature of the substance is increased, its viscosity decreases and it is therefore able to flow more readily. It increases with the increase of molecular weight and decrease as the number of double bonds increases. It affects the atomization quality, size of drop and penetration. Fuel with high viscosity tend to form larger droplets on injection which can cause poor fuel atomization during the spray, increases the engine deposits, needs more energy to pump the fuel, and wears fuel pump elements and injectors. 2. Density Density affects the mass of fuel injected into the combustion chamber and the air fuel ratio. This is because fuel injection pumps meter fuel by volume not by mass and a denser fuel contains a greater mass in the same volume. The biodiesel fuel has more density than diesel and hence it is less compressible. If a fuel is less compressible, the pressure will build more quickly and the fuel will be injected into the combustion chamber earlier in the compression cycle. Therefore it reaches the injector nozzle within a very short time. 3. Cetane number The cetane number is a relative measure of the delay time between injection and autoignition of fuels. Fuels with a lower cetane number can be accumulated before the start of combustion, result in poor combustion characteristics and lead to excessive emissions of smoke and particulates. This leads to a sudden pressure rise followed by pressure pulses and subsequent vibrations causing diesel knock, which leads to poor thermal efficiency, excessive noise and reduced life of engine components. Higher cetane numbers improve cold starting of the engine, increase fuel economy, reduce editor@iaeme.com
4 Performance and Emission Characteristics of Mahua Biodiesel In A DI- Diesel Engine exhaust emissions, decrease knocking and noise, and improve the overall durability of the engine. 4. Iodine Value Iodine value is a measure of total unsaturation within a mixture of fatty acid. It is expressed in grams of iodine which react with 1 g of the respective sample when formally adding iodine to the double bonds. The iodine value of a vegetable oil or animal fat is almost identical to that of the corresponding methyl esters. 5. Flash point The flash point is a measure of the temperature to which a fuel must be heated such that the mixture of vapor and air above the fuel can be ignited. It is the temperature at which it will ignite when exposed to a flame or a spark. The flash point of biodiesel is higher than that of diesel fossil fuel, which is safe for handling and storage purpose. 6. Calorific value The heat of combustion is important for estimating fuel consumption: the greater the heat of combustion, the lower the fuel consumption. The higher the calorific value, the greater is its utility as a potential fuel. The biodiesel samples have lower calorific values than that of diesel fuel but have the calorific values within the ASTM standard limits. Table 2 Properties of Diesel [14] and Mahua biodiesel fuels Property Units Diesel Mahua biodiesel ASTM D Carbon Chain Cn C 8 -C 32 C 14 - C 24 C 12 -C 22 Molecular Formula CHO C 18 H 36 C 18.5 H 36 O Molecular Weight g/mol Kinematic Viscosity o C Density g/cm Cetane Number min. Iodine Value g I 2 /1 g max. Flash Point Temp. o C min. Calorific Value MJ/kg EXPERIMENTATION The experimentation is carried on a naturally aspirated single cylinder, four stroke diesel engine, whose technical specifications are as shown in Table 3 and the test rig setup is as shown in figure 2. The exhaust gas analyzer specifications are shown in table 4. Table 3 Technical Specifications of Diesel engine test rig: Kirloskar- TV1 Parameter Units Value Rated Power Bore x Stroke mm x mm 87.5x 11 Connecting Rod Length mm 234 Fuel Injection System In-Line and Direct Injection Injection pressure bar 22 Compression Ratio editor@iaeme.com
5 Ƞm (%) Chaitanya P, P. V. Rao and A. Swarna Kumari Figure 2 Experimental setup: Diesel engine with Exhaust Gas Analyzer Table 4 Technical Specifications of Exhaust Gas Analyzer Exhaust Emissions Range of Measurement Accuracy Oxides of Nitrogen (NOx) -5 ppm 1. % Carbon Dioxide (CO 2 ) -2% volume.5 % Carbon Monoxide (CO) -1 % volume.3 % Oxygen (O 2 ) -22 % volume.1 % Hydro Carbons (HC) -2 ppm.1 % 5. RESULTS AND DISCUSSIONS 5.1. Performance characteristics From figure 3, it is observed that with increasing brake power, the mechanical efficiency (η m ) of DF, and MBD has increased at all loads. The η m of MBD is higher than that of diesel DF. And a further increase in the η m is observed when MBD is preheated. From figure 4, it can be seen that the Brake thermal efficiency (η b ) of MBD is lower than that of diesel fuel. The main factor that contributes to this decrease is higher viscosity of MBD. It is also seen that η b MBD-PH is in between that of MBD and DF because preheating of the biodiesel has reduced the viscosity which inturn increased efficiency. From the figure 5, it can be seen that the indicated mean effective pressure (IMEP) has decreased with the usage of MBD. The brake specific fuel consumption (BSFC) of MBD is observed to be higher than that of DF as shown in figure 6. This is because of the higher viscosity and lower calorific values of the MBD editor@iaeme.com
6 BSFC (KG / KWH) IMEP (bar) Ƞb (%) Performance and Emission Characteristics of Mahua Biodiesel In A DI- Diesel Engine 35 Figure 3 Mechanical efficiency vs Brake power Figure 4 Brake thermal efficiency vs Brake power Figure 5 Indicated mean effective pressure vs Brake power DF MBD MBD-PD DF MBD MBD-PD Figure 6 Brake Specific Fuel Consumption vs Brake power 5.2. Emission Characteristics Figure 7 shows the variation of CO with brake power for DF and MBD. It is observed that CO emissions from MBD are lower. The presence of oxygen in MBD promotes the combustion process and leads to decrease in CO and HC emissions. At full load the reduction in the HC is believed to be due to the presence of oxygen in the fuel which promotes the combustion process [15]. The decreasing trend of unburnt HC as editor@iaeme.com
7 NO X ( ÞÞM) HC ( ÞÞM ) CO (%) Chaitanya P, P. V. Rao and A. Swarna Kumari shown in Figure 8 can also be due to the reduction in ignition delay. From figure 9 it is observed that NO x emissions have reduced while using MBD. The NO x emissions are affected by the time the fuel takes to vaporize and mix with the compressed hot air. Fuels with higher cetane numbers reduce the ignition delay and there by result less mixture to being involved in premixed combustion. Hence a lower NO x emissions are observed in MBD due to its high cetane number. Further oxidation is improved because of the presence of oxygen in the MBD which reduced NO x. From the figure 1, it is observed that there is a decrease in the smoke emitted from MBD. A decrease in smoke levels is observed at all brake power conditions DF MBD MBD-PD Figure 7 Carbon monoxide emissions Figure 8 Hydrocarbon emissions Figure 9 Nitrogen oxides emissions editor@iaeme.com
8 SMOKE (%) Performance and Emission Characteristics of Mahua Biodiesel In A DI- Diesel Engine Figure 1 Smoke emission 6. CONCLUSIONS The experimentation was carried out with mahua biodiesel with and without preheating. A considerable decrease in the emission levels of carbon monoxide, hydrocarbons, nitrogen oxides and smoke were observed. A similar and a slightly lower efficiency were noted for mahua biodiesel when compared with that of diesel fuels. But a higher specific fuel consumption is observed for mahua biodiesel which can be taken care by pre heating the biodiesel. Thus mahua can be a considered as a sustainable renewable fuel which helps reduce emissions with a similar performance as that of a diesel engine. REFERENCES [1] Verma NM, Mehrotra S, Shukla A, Mishra BN (21) Prospective of biodiesel production utilizing microalgae as the cell factories: a comprehensive discussion. Afr J Biotechnol 9(1): [2] Agarwal AK, Das LM. Biodiesel development and characterization for use as a fuel in compression ignition engines. Am Soc Mech Engrs J Eng, Gas Turb Power 2; 123:44 7. [3] Ayhan Demirbas. Progress and recent trends in biodiesel fuels: Energy conversion and management, Elsevier: 5 (29) [4] Jayed M, Masjuki H, Saidur R, Kalam M, Jahirul M. Environmental aspects and challenges of oil seed produced biodiesel in South East Asia. Renewable and Sustainable Energy Reviews 29; 13: [5] Murugesan A, Umarani C, Chinnuswamy T R, Krishnan M, Subramanian R, Neduzchezhain N. Production and analysis of bio-diesel from non edible oils a review. Renewable and Sustainable Energy Reviews 29; 13: [6] Patil P D, Deng S. optimization of biodiesel production from edible and non edible vegetable oils. Fuel 29; 88: [7] Basha S A, Gopal K R, Jebaraj S. A review on biodiesel production, combustion, emissions and performance. Renewable and Sustainable Energy Reviews 29; 13: [8] Sun J, Caton J A, Jacobs T J. Oxides of nitrogen emissions from biodiesel fueled diesel engines. Progress in Energy and Combustion Science 21; 36: [9] Szulczyk KR, Mc Carl BA. Market Penetration of biodiesel. Renewable and Sustainable Energy Reviews 21; 14: editor@iaeme.com
9 Chaitanya P, P. V. Rao and A. Swarna Kumari [1] Qi D, Chen H, Geng L, Bian Y. Experimental studies on the combustion characteristics and performance of a direct injection engine fueled with biodiesel/ diesel blends. Energy Conversion and Management 21; 51: [11] Chauhan B S, Kumar N, Cho H M. A study on the performance and emission of a diesel engine fueled with Jatropha biodiesel oil and its blends. Energy 211. [12] Xue J, Grift T E, Hansen A C. Effect of biodiesel on engine performances and emissions. Renewable and Sustainable Energy Reviews 211; 15: [13] P V Rao. Effect of properties of karanja methyl ester on combustion and NO x emissions of a diesel engine. Journal of Petroleum Technology and Alternative Fuels, vol: 2, , pp: [14] P V Rao and Basava V A Rao. Influence of Physical and Chemical Properties of two biodiesel fuels on performance, combustion and exhaust characteristics in a DI- CI engine. Proceedings of ASME 28 Internal Combustion Engine Division Spring Technical Conference. pp: [15] Nwafor OMI, Rice G, Ogbonna AI. Effect of advanced injection timing on the performance of rapeseed oil in diesel engines. Journal of Renewable Energy 28; 21: [16] R. Senthil Kumar and M. Prabu. Experimental Investigation of A Di Diesel Engine Using Tyre Pyrolysis Oil-Diesel Blends As A Biodiesel, International Journal of Mechanical Engineering and Technology, 5(2), 214, pp [17] Shankar Suthar, Mangesh Kumar Chauhan and Dr. Mohammad Israr. Investigation and Analysis of Diesel Engine Using Bio Diesel, International Journal of Mechanical Engineering and Technology, 6(2), 215, pp [18] Dr. Rajeshkumar U. Sambhe and Dr. Pankaj N. Shrirao. Performance Analysis of Single Cylinder (Di) Diesel Engine by Air Swirl Induction with Internally Threaded Inlet Manifold, International Journal of Mechanical Engineering and Technology, 5(7), 214, pp editor@iaeme.com
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