For the purpose of providing a scientific reference for improving energy conservation and performance of marine diesel engine, the thermal balance analysis and exergy balance analysis and emission research on ethanol diesel-oil alternative fuel of the existing diesel engine are performed. All necessary data are obtained from an actual diesel engine of KTA50-M2 which is used in a boat located in Dalian. The result shows that engine performance parameters are of no big change, however, the exhaust emissions are significantly reduced.
In this paper, for the purpose of providing a scientific reference for saving energy and improving the efficiency of diesel engine, the impact of ethanol diesel-oil alternative fuel and waste heat recovery are investigated on the basis of thermodynamic analysis. The results illustrate that, after using ethanol diesel alternative fuel, engine performance parameters are of no big change, however, the exhaust emissions are significantly reduced; Recycling the energy contained in the exhaust gas and cooling water, can achieve the purpose of energy conservation and emissions reduction, beside improving the thermal efficiency and exergy efficiency of the diesel engine.
Emerald is the green to greenish blue variety of beryl, which contains chromophore chrome and vanadium. Emeralds of all deposits have fissures, so most have been filled to avoid fragmentation during cutting. Stability is an important factor to filling emeralds. Recently, a new filler ExCel occurred, which is considered stable and removable, however, its durability is lack of scientific basis and testing. This study used magnification, fluorescence technology, FTIR and UV-Vis spectroscopy to investigate the durability of ExCel-filled emeralds. Emeralds filled with ExCel are relatively stable under conditions of daily wear in general, but durability decreased in hydrochloric acid, acetone or under heating to over 200°C. Fractures were more evident in side of emerald after hydrochloric acid immersion. After soaking in acetone fissures increased and deepened significantly. After heating to 250°C, brown material leaked from fissures of ExCel-filled emeralds, analyzed to be bisphenol A epoxy resin, curing agent and imine diluent components. The study has indicative significance for suitable conditions of ExCel-filled emerald wearing and preservation.
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