The (partial or total) substitution of petro-diesel with biodiesel in internal combustion engines (ICEs) could represent a crucial path towards the decarbonization of the energy sector. However, critical aspects are related to the controversial issue of the possible increase in Nitrogen Oxides (NOx) emissions. In such a framework, the proposed study aims at investigating the effects of biodiesel share and injection timing on the performance and NOx emissions of a diesel micro combined heat and power (CHP) system. An experimental campaign has been conducted considering the following operating conditions: (i) a reference standard injection timing (17.2° BTDC), an early injection timing (20.8° BTDC), and a late injection timing (12.2° BTDC); (ii) low (0.90 kW), partial (2.45 kW), and full (3.90 kW) output power load; and (iii) four fuel blends with different biodiesel (B) shares (B0, B15, B30, and B100). Experimental data were also elaborated on thanks to the response surface modelling (RSM) technique, aiming at (i) quantifying the influences of the above-listed variables and their trends on the responses, and (ii) obtaining a set of predictive numerical models that represent the basis for model-based design and optimization procedures. The results show: (i) an overall improvement of the engine performance due to the biodiesel presence in the fuel blend —in particular, B30 and B100 blends have shown peak values in both electrical (29%) and thermal efficiency (42%); (ii) the effective benefits of late SOI strategies on NOx emissions, quantified in an overall average NOx reduction of 27% for the early-to-late injection, and of 16% for the standard-to-late injection strategy. Moreover, it has emerged that the NOx-reduction capabilities of the late injection strategy decrease with higher biodiesel substitution rates; through the discussion of high-prediction-capable, parametric, data-driven models, an extensive RSM analysis has shown how the biodiesel share promotes an increase of NOx whenever it overcomes a calculated threshold that is proportional to the engine load (from about 66.5% to 85.7% of the biodiesel share).

https://www.mdpi.com/1996-1073/15/10/3586/pdf?version=1652668615

Experimental Investigation and RSM Modeling of the Effects of Injection Timing on the Performance and NOx Emissions of a Micro-Cogeneration Unit Fueled with Biodiesel Blends

Effect of synthetic antioxidant doped biodiesel blend with oxy-hydrogen gas on the low heat rejection engine

Performance Evaluation of Diesel-Jatropha Biodiesel-Methanol Blends in CI Engine

Biofuels are strongly emerging as partial substitutes for fossil fuel from the economic as well as environmental angle. It is known that most developed and developing countries spend a huge amount of foreign exchange on oil imports. Therefore, these countries would like to introduce the use of biofuels aggressively by cutting down the cost of production and subsidizing the same. It is established now that biofuels have the least adverse effects on the environment when used as a fuel in the CI engines. Biodiesel is basically mono-alkyl estersof long-chain fatty acids and can be used successfully as a fuel in the compression ignition engines Many researchers have concluded that biodiesel holds promise as an alternative fuel for diesel engines, since its properties are very close to diesel fuel; therefore, biodiesel can beused in diesel engines with few or no modifications. Diesel-fuel blends with biodiesel have superior lubricity, which reduces wear and tear on the diesel engine and makes the engine components last longer. Biodiesel can mix well with diesel fuel and stays blended. Biodiesel has a higher cetane number than petroleum diesel fuel, no aromatics, and contains 10-11% oxygen by weight. These characteristics of biodiesel reduce the emissions of Carbon Monoxide (CO), Hydrocarbons (HC) and Particulate Matter (PM) in the exhaust gas compared with diesel fuel. However, NOx emissions of biodiesel increase because of combustion and some fuel characteristics. Hence in this paper, a comprehensive review is presented on the performance, combustion and emission characteristics of three biodiesel fuel Thumba, Jatropha and Ambadi that are easily available in the western part of India. This review will behelpful to the researchers to understand the behaviour of this biodiesel when used as a fuel in CI engines.
How to cite this article: Rai VR, Shringi D, Mathur YB. Use of Thumba, Jatropha and Ambadi Biodiesel as CI Engine Fuel: A Review. J Adv Res Mech Engi Tech 2020; 7(3): 26-36.

Dinesh Shringi

Papers

Performance Evaluation of Diesel-Jatropha Biodiesel-Methanol Blends in CI Engine

Use of Thumba, Jatropha and Ambadi Biodiesel as CI Engine Fuel: A Review