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Abstract:Hydrothermal carbonization is an exothermal process that lowers both the oxygen and hydrogen content of the feed by dehydration and decarboxylation. This is achieved by applying temperatures of 160-200 o C in a suspension of biomass in water at saturated pressure for several hours. The objectives of the study were to carbonize the MSW by the way of hydrothermal treatment process and produce a solid coal like product for application of energetic purposes. For carrying the carbonization experiment, the prototype HTC reactor has been fabricated. Organic fractions of MSW collected were characterized. From the results, it was found that carbon content, energy potential can be increased by the treatment of hydrothermal carbonization in achieving carbonization of the MSW.

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In this work, experimental investigation was carried out to test the performance and emission characteristics of a CI engine using diesel and cotton seed oil methyl ester blended fuel (COSME20) along with titanium oxide nano particles as an additive in biodiesel blends. The titanium oxide nanoparticles promote the combustion process that results in more oxidation of CO and reduces HC emission. The engine test was conducted with various blends of diesel and biodiesel with and without nanoparticles, namely B20 (20% biodiesel + 80% diesel), BN20 (20% biodiesel + 80% diesel + 20ppm), BN40 (20% biodiesel + 80% diesel + 40ppm) at different loads. The test results showed that the addition of titanium oxide nanoparticles in diesel and biodiesel blends improved combustion and reduced the exhaust gas emissions significantly.

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The purpose of this research is to investigate the effect of mixing water with diesel to make an emulsified fuel considering the needs for the vehicle performance and its cleanest possible operation. The test fuels chosen for the investigation are termed Emulsion 1 (EM1) and Emulsion 2 (EM2). EM1 is prepared in the ratio of 91/8/1 which represents 91% diesel, 8% water, 0.5% surfactant (Span 20), and 0.5% cosurfactant (Tween 20) with continuous stirring. EM2 has a composition of 94% diesel, 5% water, 0.5% Span 20, and 0.5% Tween 20. The stability of the emulsified fuel is checked for 8 hours. The performance and emission characteristics of EM1 and EM2 are compared with diesel fuel. The emission parameters such as hydrocarbon emission, carbon monoxide (CO) emission, smoke opacity, and oxides of nitrogen (NOx) emission have been measured. To compare the difference in performance characteristics between diesel fuel and emulsified fuel, brake thermal efficiency has been taken into account as a measure. Appreciable reductions of emission parameters have been obtained, and hence the investigation assures that this research could be further extended to biodiesel fuel as it produces more NOxthan diesel fuel.

In this paper, aluminum oxide nanoparticles as added with pongamaia biodiesel. Experimental study is focussed the performance and emission characteristics of a compression ignition diesel engine using biodiesel and biodiesel mixed with aluminum oxide nanoparticles as an additive in different proportions. The aluminum oxide nanoparticles promote complete combustion in the diesel engine. The experiments were conducted using biodiesel (B100) with aluminum oxide nanoparticles additive in proportions of BN100, BN200, BN300, BN400 and BN500 ppm at different brake power. Results were analyzed and compared with diesel, biodiesel, biodiesel with addition of aluminum oxide nanoparticles. Gas analyzer was used to measure the various gas pollutants. The test results showed that the addition of aluminum oxide nanoparticles with biodiesel has improved complete combustion of the fuel leading to better performance and reduced exhaust emissions like CO, HC, smoke and NOx when compared to diesel fuel.