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In previous studies, multiple premixed compression ignition (MPCI) has been proposed as a novel combustion concept in gasoline compression ignition engines which has great potential to achieve high thermal efficiency and low emissions simultaneously. MPCI mode was realized by a sequence of “spray–combustion–spray–combustion” around the compression top dead center (TDC). This study is aimed for the...
Adding a hydrophobic micro-porous layer (MPL) between a gas diffusion layer (GDL) and a catalyst layer (CL) at the cathode of a PEM fuel cell was found capable of improving cell performance. However, how an MPL does this is not well-understood because current techniques are limited in measuring, observing and simulating multiphase pore fluid flow across the full range of pores that vary to a great...
Branched-preformed particle gel (B-PPG) is a newly developed chemical agent for enhanced oil recovery in heterogeneous reservoirs. In this paper, laboratory experiments are performed to characterize the morphology and rheological properties of a B-PPG suspension in water, investigate its transport behavior through heterogeneous porous media, and study its performance in enhanced oil recovery in heterogeneous...
Burning biomass fuels generates large quantities of ash products which contain plant nutrients, such as Ca, Mg, P and K. To return these nutrients back to forest soil, biomass ash could be spread onto forest soil. Although biomass ash land application can decrease soil acidity and restore soil nutrient balance, its high alkalinity presents some challenges in terms of direct land application. The high...
The effects of difference in fuel components on the droplet evaporation and combustion are numerically investigated. Jet-A is used as liquid fuel, and one (n-decane)-, two (n-decane and 1,2,4-trimethyl-benzene)- and three (n-dodecane, iso-octane and toluene)-component fuels are used as the surrogate fuels of Jet-A. The results show that the evaporation of the three-component surrogate fuel becomes...
Although often neglected, the non-steady state operations of power plants are more likely to result in increased emissions and process safety incidents compared to steady state operations. There are multiple challenges in predicting non-steady state emissions. Firstly, it is difficult to collect accurate data during such events due to their dynamic process variables and shorter time span. Additionally,...
In this study, early first (pilot) direct injection and second injection close to the top dead center (TDC) strategies were applied to a homogenous charge compression ignition (HCCI) combustion engine. For experimental investigations, a diesel engine was converted to an electronically controlled HCCI-DI engine. Late second injection variations were investigated experimentally and numerically for HCCI-DI...
Mesoporous silica MCM-41 supported Ni-based catalysts were prepared by glucose (Glu) and β-cyclodextrin (βCD) modified impregnation method, respectively. The physicochemical properties of the catalysts (Ni/MCM-41-βCD and Ni/MCM-41-Glu) were characterized with BET, XRD, H2-TPR and TEM techniques, and their catalytic performance in CO2 reforming of methane to syngas was evaluated. The results revealed...
Biodiesel fuel was produced from waste cooking oil by transesterification process. B20 and B50 blends of biodiesel–petroleum diesel were prepared. These blends and D2 fuels were tested in a single cylinder CI engine. Performance, combustion and emission values of the engine running with the mentioned fuels were recorded. Then the piston and both exhaust and intake valves of the test engine were coated...
There is an extensive worldwide search for alternate fuels that can displace fossil-based resources, yet still fit within existing infrastructure. At Argonne National Laboratory, strains of fuel have been designed that are generated by photosynthetic bacteria, eventually producing a heavy alcohol called phytol (C20H40O). Phytol’s physical and chemical properties (cetane number, heat of combustion,...
Co/SiO2 catalysts with 0.4–7.0wt.% of Mn addition were prepared and evaluated for Fischer–Tropsch synthesis (FTS), using H2-deficient biosyngas (H2/CO/CO2/N2=45/45/7/3, vol%) as feed gas. 0.8wt.% of Mn addition to Co/SiO2 increased Co dispersion and weakened Co–Si interaction on Co–(0.8%)Mn/SiO2 catalyst. Co reducibility was improved to 32.1% and 79.3% at 150–400°C and 150–750°C respectively by H2...
A microwave hydrothermal method was developed to deposit WO3 on Al2O3 for rapidly preparing W/Al2O3 hydrodesulfurization (HDS) catalysts with both high tungsten dispersion and weak tungsten–alumina interaction. The catalysts were characterized by XRD, XPS, N2 adsorption, H2-TPR, NH3-TPD and HRTEM; their activity was tested by HDS of dibenzothiophene. Compared to the previous hydrothermal deposition...
Industrial oilseeds camelina (Camelina sativa L.), carinata (Brassica carinata), and pennycress (Thlaspi arvense L.) offer great potential as biofuel feedstocks due to their non-food nature and positive agronomic attributes. This research focused on compression ignition (CI) engine performance and emissions of these industrial oilseeds as compared to both traditional feedstocks and petroleum diesel...
Laminar flame speeds of dimethyl ether/methane–air mixtures were measured in a constant volume combustion vessel at different initial temperatures (303–453K), initial pressures (0.1–0.7MPa), dilution ratios (0–25%), equivalence ratios (0.7–1.6) and over wide range of DME blending ratios (0–100%). Markstein lengths were also obtained at different blending ratios and equivalence ratios. Zhao DME model...
The co-production of acetone during traditional butanol fermentation (acetone–butanol–ethanol) lowers the yield of alcohol biofuels. The present study was aimed to develop an improved Clostridium acetobutylicum strain with enhanced alcohol fuel production capability. The previously developed IBE (isopropanol-butanol-ethanol) producing C. acetobutylicum DSM792-ADH strain was further optimized to enhance...
Polish energy sector is mainly based on coal. More than 90% of electricity is generated in steam power or heat-and-power plants fired by hard coal or lignite. Obviously, the share of coal fired units in Poland is higher than in EU-15 countries. By taxing CO2 generation EU enforces the development of low carbon technologies. The motivation behind this policy is to limit the global warming effect resulting...
This research reports on the synthesis of methylic and ethylic biodiesels from pequi oil using the transesterification reaction process via alkaline homogeneous catalysis. Thermogravimetric studies helped to evaluate the thermal stability of the biodiesels. A methanol/ethanol 20:80 (w/w) alcoholic solution furnished the ethylic biodiesel and allowed for straightforward optimization of the biodiesel–glycerin...
Brown coal is a soft sedimentary organic rock which is complex in nature and is the main source of energy production. In this work, we have studied the combustion and pyrolysis of brown coal using reactive molecular dynamic (MD) simulation. To make the large scale (above 1000 of atoms) reactive system practical, ReaxFF MD system was used which is 100 times faster than the methods of quantum mechanics...
In order to predict coal behaviour during certain utilisation processes, and to improve and develop coal conversion technologies, it is important to understand the swelling behaviour and plastic properties of coal. X-ray CT (computed tomography) and mercury submersion were used to quantitatively and qualitatively describe the swelling behaviour (N2 atmosphere, 7K/min) of large particles (−20+16mm)...
Screen-printed carbon electrode (SPCE) surface was easily altered through spontaneous hydrophobic interactions with cationic surfactant cetyltrimethylammonium bromide (CTAB) to form a surfactant-adsorbed-layer. This finding combined the practicality of the SPCE with the CTAB’s anti-fouling ability and preconcentration properties as a suitable alternative to determine the quinizarine in fuel samples...
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