Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Energy, Exergy, Performance and Combustion Assessment of a Small Diesel Engine Fueled with Crambe abyssinica Methyl Ester
Submission Author:
Ramon Eduardo Pereira Silva , MS , Brazil
Co-Authors:
Omar Seye, Rogerio da Silva Santos, Ramon Eduardo Pereira Silva
Presenter: Ramon Eduardo Pereira Silva
doi://10.26678/ABCM.COBEM2023.COB2023-1728
Abstract
The concerns about the increasing greenhouse effect gases emissions leads to the need of surveying environmentally friendly renewable fuels. Several studies have been carried out about the biodiesels as ethyl and methyl esters used as complementary or substitute of diesel oil in compression ignition reciprocating engines both in automotive and energetic fields. Some of these biodiesels are esterified from edible source resulting in competition with alimentation. So, the assessment of non-edible sources for compression ignitions reciprocating engines operation shows an interesting motivation. Crambe abyssinica is a non-edible oilseed present in the Cerrado biome at the Brazilian Midwest region which shows a potential opportunity to fulfill this role. This work compares the performance, energetic, exergetic and pollutant emissions of a small engine driven generator using both 100% diesel oil and 100% Crambe abyssinica Methyl Ester (CAME) as fuel. The Crambe abyssinica oil and Methyl Ester were produced at the laboratory. The grains of Crambe were cold pressed mechanically due it is the simplest and usual method for oil extraction from oilseeds. The Crambe biodiesel was produced via basic catalytic transesterification with methanol. For data collection, the generator set was instrumented to collect brake power, inlet air and fuel mass flow rates and the exhaust concentrations of the main emissions (O2, CO2, CO, CH4, and NOx). Also, the inlet airs and exhaust gas temperatures were collected. The flue gases energy rate and exergy were computed regarding the volumetric ratios of these emissions turned into mass flow rates at the measured temperatures. The inlet fuel chemical exergies were defined regarding it mass composition and the Higher Heating Values. Although the effective power delivered was lower for CAME, about 5.13%, the ester operations showed better results in efficiency parameters. Specific fuel consumption decreased by 9.58% while thermal efficiency and exergy efficiency increased by 16.94% and 17.08%, respectively. The emissions of Carbon monoxide and Unburned Hydrocarbons decreased by 8.11 % and 40.50 % respectively. The Nitrous Oxides emissions reduction remains within the gas analyzer uncertainty. These results leaded to the conclusion of its technical and environmental feasibility for compression ignition engines operation.
Keywords
compression ignition engine, Exergy Analysis, Energy Analysis, crambe abssynica
