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Co-hydrotreating of microalgae (M) and UEO (used engine oil) was examined for the direct production of gasoline and diesel fuels or blending components. The addition of the noble metal catalysts promoted the cracking and in situ hydrogenation of liquid products (oils) and was beneficial for the production of liquid products. Using Pt/C as the catalyst, the effects of temperature (350–450 °C), time...
The catalytic hydropyrolysis and co-hydropyrolysis of algae (microalgae and macroalgae) and used engine oil (UEO) for the production of potential fuels for automobiles were examined. The co-hydropyrolysis of algae and UEO produced oils that possessed slightly higher H and C content, a higher H/C atomic ratio, and an extensively reduced heteroatom (59.78–75.62% for O, 6.98–81.65 for N, and 43.30–86...
This study investigated effects of dimethyl ether addition on the gasoline engine combustion and emissions performance under idle and stoichiometric conditions. The engine was first modified to be fueled with gasoline and dimethyl ether simultaneously. The experimental results showed that, with the increase of dimethyl ether energy fraction in the total fuel, the total fuel energy flow rate was decreased,...
Low temperature combustion (LTC) based on two-stage injection is the combustion mode which uses main injection to generate homogeneous charge and trigger injection to ignite. In this paper, the effect of injection ratio and starting-point of injection (SOI) of main injection on LTC were studied. The result shows that the trigger injection can control the process of combustion and make LTC more stable...
The exhaust gases contain large amounts of unburned hydrocarbons during cranking without combustion. The effects of unburned hydrocarbon recirculation on ignition and combustion during diesel engine cold starts were investigated using both experiments and simulations. Experiments were conducted on a single-cylinder DI (direct injection) diesel engine equipped with a common rail injection system. The...
Through experiments conducted on a single cylinder direct injection (DI) diesel engine, effects of exhaust gas recirculatoin (EGR) on combustion and emission during cold start were investigated. Combustion of first firing cycle can be promoted significantly by introducing EGR. In experiments, when partially closed choking valve and partially or fully opened EGR valve, peak cylinder pressure of first...
This paper focuses on the effects of internal and cooled external exhaust gas recirculation (EGR) on the combustion and emission performance of diesel fuel homogeneous charge compression ignition (HCCI). The use of fuel injection before the top center (TC) of an exhaust stroke and the negative valve overlap (NVO) to form the homogeneous mixture achieves low NO x and smoke emissions HCCI. Internal...
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