Project Reference No.: 40S_B_MTECH_007

Transcription

1 PRODUCTION OF BIODIESEL FROM DAIRY WASH WATER SCUM THROUGH HETEROGENEOUS CATALYST AND PERFORMANCE EVALUATION OF TBC DIESEL ENGINE FOR DIFFERENT DIESEL AND METHANOL BLEND RATIOS Project Reference No.: 40S_B_MTECH_007 COLLEGE BRANCH GUIDES STUDENTS : CENTRE FOR POST GRADUATE STUDIES, MYSURU : THERMAL POWER ENGINEERING : MR. KRISHNAMURTHY K.N. : MR. VENKATESH B.J. INTRODUCTION: Renewable sources play an important role in future due to unavailability of conventional fuels. Rudolf Diesel invented diesel engine in 1892 and he predicted that in future waste vegetable oil and animal fats will fill the conventional fuel position. Generally now a day s petroleum fuels powering the locomotive but its service can be harness until 2050 later it exhausted, hence there is an essence for search on alternative fuel. Biodiesel is the greater substitute for diesel engine which fulfil all the requirement including properties, efficiencies etc, of the diesel engine. Biodiesel fuel obtained from oil, fats, grease, etc Biodiesel is a mono alkyl ester comprising of long chain fatty acids. It cannot be used directly to the engine as that of diesel. Blending of obtained biofuel with known volume of diesel leads to formation of biodiesel. For the generation of this alternative fuel, oil should react with alcohol in presence of acid or base catalyst, generally known as Trans-esterification process. Higher percentage of carbon emission can be controlled because of removal of carbon in the fuel by the plant feedstock. Farmers will get the opportunity of improving their economic status by growing more biofuel plant. They can use it for commercial purpose. Aninidita Karmakar has done research on the various thermo physical and chemical properties of soybeans, sunflowers, rice bran and tobacco biodiesel he obtained 254 and 274 flash point value for soybean and sunflower oil. Fuel processing technology involved RSM methodology, yield of 93.55% obtained when use of CaO-Mg Nano catalyst at 3.55 wt% concentration, molar ratio 38:1 temperature C and time 3.44 hr. Activation site of catalyst reduced after 4 times of reusable and found less than 80% of yield at 5 th time by H.V. Lee, et.al. Study on the efficiency parameter obtained from B20 scum methyl ester blend satisfied conventional diesel. BTE increase with increase in blend, experiment conducted at 200 bars. OBJECTIVES: To produce Biodiesel from dairy wash water scum using heterogeneous catalyst. To Optimization of dairy waste scum by using homogeneous and heterogeneous catalyst. To Comparison made between optimized value obtained from RSM methodology for both NaOH and CaO catalyst. To validate various thermo physical properties for both crude and FAME of scum oil. To evaluate performance carry out from TBC diesel engine for various diesel and methanol blend ratios. To plot various graphs for different efficiencies and for physical properties. METHODOLOGY: The seed collected are fed into mechanical expeller, 3 pass crushing are procured for maximum oil extraction. Oil extracted whose FFA has to be found it obtained more than 2% hence one stage of acid esterification was carried out to bring it below the 2%. Acid esterification has done 1 L of oil mix with 200 ml of methanol with the addition of 10 ml sulfuric acid reaction was kept at 60 C and 60 min time. After the esterification the traces of FFA, acid content and methanol ratio collected at the top, which has to be separated. Further processing has been done by using base Transesterification for 1 L of acid esterified oil mixed with methoxide solution contain 240 ml of methanol and 6 g of base catalyst. The solution is maintained at a temperature of 65 deg C on the magnetic stirrer for 60 min of time. The solution taken out from the separating flask should be dried for complete evaporation of water content at 100 C. Process optimization has done by using 4 factors and 5 level RSM optimum methodology technique, optimum value obtained are methanol-oil ratio.

2 Fig. 1 Extraction of scum oil methyl ester from dairy waste water Optimization was done on two separate catalyzed processes, for NaOH catalyzed process methanol to oil molar ratio is 3:1 to 15:1, catalyst concentration is 0.2 to 2.6, time is 30 to 110 min and temperature is 30 to 90ºC. Similarly for CaO catalyzed process methanol-oil ratio is 5:1 to 25:1, catalyst concentration is 0.2 to 1, time is 60 to 120 min and temperature is 35 to 95ºC. Lowest yield obtained from NaOH catalyzed process was 51 % and highest was 87 %, similarly from CaO catalyzed process lowest yield was 69 % and highest was 97.2 %. 1. Properties of Crude Scum oil And Methyl Ester of Milk Scum Property specification Units Testing procedure ASTM Biodiesel Standard ASTM CSO SOME Diesel Density at 15 C kg/m 3 D Kinematic Viscosity at 40 C mm 2 /s D Calorific Value kj/kg D Flash point C D min Cloud point C D to Pour point C D97-15 to Acid value mg KOH/g D max Copper strip corrosion for 3 h at 100 C D130 No.3 max. 1a 1a 1 Sulphur content %m/m D max Carbon residue %m/m D max. - Nil Cetane number D min Ash content % mass D max Distillation temperature 90% Oxidation stability, at 110 C C D max at 95% distillated Hour EN14112 Min. 3 h Ester Content mg, of KOH/g EN Saponification value mg KOH/g oil Engine Specification Kirloskar Engine TV 1 Specifications Type: Four Stroke, Single Cylinder Vertical Water Cooled Diesel Engine Rated power kw

3 Rated Speed rpm Bore Dia (D) mm Stroke (L) mm Compression ratio :1 C.V. of Fuel for diesel 42,500kJ/kg Density of Diesel kg/m 3 Fig.2 Experimental set up of the C.I. engine with exhaust analyzer Result and Graphs: Several tests have been carried out to examine properties, performance and emission characteristics for different blends such as [D100, B20, B40, B60 and B100] in comparison with pure diesel for varying injection pressures like 160 bar, 180 bar and 200 bar pressure. Due to the effect of coating there is a reduction of heat loss from the combustion chamber of diesel engine which improves the performance and emission characteristics of coated engine. From the obtained result there is an increase in 2% of brake thermal efficiency and decrease of 0.08 kg/kwhr of B.S.F.C for B20 blend at 180 bar pressure for coated engine when compared to diesel. At 200 bar pressure the characteristics of blended fuels and diesel will remain same for both coated and uncoated engine. For 160 bar pressure, the performance of engine at high blend proportion like B40 and B60 shows very poor performance when compared to diesel. At the same pressure (160 bar), all emission characteristics like HC, CO, CO2 and NOx were much greater when compared to the emissions at other pressures. From the emission characteristics graphs, the result shows that, for 180 bar pressure there is a reduction of 0.10% in CO and 35 ppm of HC for coated engine for a blend proportion of B20 when compared to diesel. But, there is a partial increase in CO2 and NOx for 180 bar pressure for all the blends of biodiesel when compared to diesel. At 200 bar pressure, all the emission characteristics except CO2 decreases for all blend proportion when compared to diesel. From the experimental investigation, it can be concluded that at 180 bar pressure for B20 blend coated engine the performance and emission characteristics gives the significant results when compared to diesel and other blend proportions among other injection pressures. Hence, the experimental result suggests that B20 blend at 180 bar pressure is suitable to run the compression ignition engine, with minimum modifications which meets global energy crisis and satisfies environmental regulations. Thermal Efficien cy The various graphs plotted for engine performance are shown in below table Performance and Emission Characteristics of SOME in an un Coated Diesel Engine Specific Fuel Consum ption

4 CO HC CO 2 NO X Performance and Emission Characteristics of SOME in Coated Diesel Engine Thermal Efficiency, Specific Fuel Consumpt ion CO HC CO 2

5 NO X Conclusion: Dairy waste water is one of the potential sources for biodiesel extraction; it not only acts as a substitute for diesel engine but also helps in solving the problem of disposal. The yield of 97.4% obtained when CaO catalyst were used as a base catalyst and 89% of yield obtained under the NaOH homogeneous catalyst. All thermo physical properties obtained from scum methyl ester were good agreement with the ASTM and EN14214 standards. Performance was inspected in yttrium coated 4s single cylinder diesel engine, in which thermal efficiency, BSFC, BP etc., were closer to the values obtained from D100. Various exhaust emission such as CO, HC, CO2 and NOx are obtained lesser with increase in biodiesel blend ratios for coated engine. From the experimental result it concluded that for B20 blend ratio is significant for coated engine with respect to diesel and other blends. ~`*`~`*`~