This chapter briefly focuses on the use of biodiesel and natural gas in dual-fuel diesel engines, providing information about natural gas and biodiesel, and their characteristics, engine performance and exhaust gas emissions. The theoretical and experimental study provides analysis of a commercial compression ignition engine operating in dual mode with three fuels: natural gas, diesel and biodiesel at different load and biodiesel blends. On the basis of the results, the effects of air conditions, and the type and quantity of fuel used over the engine performance and environmental impact are reported, and viability of natural gas and biodiesel as alternative fuels for diesel engines is verified.
The aim of this research is to study the pollutant emissions of the commercial diesel engine, operating with B5 (commercial diesel), B70, B80, B90 and natural gas. The fuel used in the engine consists of a mixture of 15% diesel and biodiesel (liquid fuel) and 85% natural gas. Experiments were made using 40, 60 and 80 kW load. The engine was instrumented to obtain the temperature, air, gas and diesel (plus biodiesel) flow rates, the air pressure at the entrance of the engine, the lubricant oil temperature, and the concentration of exhaust gases during each experimental test. It was verified that the emission of NOx, NO and CO2 had decreased while the emissions of CO and SO2 had increased, when compared to the conditions using standard diesel (B5) alone.
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