窒素-気液混合燃料による燃料特性の改善

Abstract

Marine fuels contain residue oil. As the heavy oil approaches heavy fuel oil (HFO), the ratio of light oil decreases and the residual oil increases, resulting in a high kinematic viscosity even at room temperature. Biodiesel fuel, a substitute fuel for light oil produced by methyl esterification of waste cooking oil, also has a high kinematic viscosity caused by impurities in the oil and oxidation degradation. Impurities in residual C fuel oil and waste cooking oil or vegetable oil clog the fuel-injection valves. In common rail diesel engines, the kinematic viscosity of the fuel plays a significant role. This study investigates the effect on the kinematic viscosity of gas mixture fuel by adding nitrogen to the fuel to effectively reduce nitrogen oxide during combustion. As a result, the kinematic viscosity of marine diesel oil and light oil was slightly reduced when converted to gas mixture fuel. However, the reduction in kinematic viscosity was pronounced when the fuel was a gas mixture, for HFO and straight vegetable oil that have high kinematic viscosities, and the difference in the amount of gas in the mixture was also apparent. The amount of gas in the mixture of 0.1L/min was the most effective at reducing the kinematic viscosity for HFO, resulting in a 54.0% improvement in fuel characteristics.