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Back-propagation (BP) neural network models were developed to accurately predict the ignition temperature and activation energy of 16 typical Chinese coals and 48 of their blends. Pearson correlation analysis showed that ignition temperature and activation energy were most relevant to the moisture, volatile matter, fixed carbon, calorific value and oxygen of coals. Accordingly, three-layer BP neural...
Back-propagation (BP) neural network models were developed to accurately predict the maximum burning rate and fixed carbon burnout efficiency of 16 typical Chinese coals and 48 of their blends. Early stopping method was used to prevent the BP neural network from over-fitting. The generalisation performance and prediction accuracy of the neural network thus became significantly improved. Pearson correlation...
This study is aimed to examine the utilization of wastewater produced from the microwave irradiation upgrading process of Indonesian lignite. Physicochemical properties including total organic carbon (TOC), chemical oxygen demand (COD), organic functional groups, inorganic anions, inorganic cations, surface tension, pH, and electrical conductivity (EC) of the removed water were analysed. Results showed...
A reduced chemical kinetic mechanism of the n-butanol/biodiesel blend was developed for dual fuel engine simulations. The reaction flow analysis reduction method was adopted to lump and remove the unimportant species and the related reactions. The reduced mechanism of n-butanol contains 71 species and 349 reactions. The reduced mechanism of n-butanol was merged into a reduced mechanism of biodiesel...
Indonesian lignite was continuously modified in a tunnel-type microwave oven to improve its slurribility. The maximum solid concentration of coal–water slurry (CWS) prepared from modified lignite increased from 41.6wt.% to 54.0wt.% with an enhanced rheological behaviour. The contact angle, oxygen functional groups, molar ratio of methylene to methyl, paramagnetic centres of modified lignite were analysed...
Oxy-fuel circulating fluidized bed combustion (CFBC) has an advantage of being operated with high oxygen concentration, making it a better choice for CO2 capture. In order to study the emission of nitrogen oxides and SO2 under O2/RFG (recycle flue gas) firing mode with an overall O2 concentration of 50%, oxy-fuel combustion experiments with Datong coal were carried out in a 0.1MWth oxy-fuel CFBC apparatus...
Extraction of aromatic sulfur compounds from model oil using a temperature-responsive ionic liquid (IL) N-butyl-N-methylpiperidinium tetrachloroferrate ([C4mpip]FeCl4) as extractant has been investigated. In the extractive desulfurization process, liquid–liquid equilibrium was obtained at 45°C for 10min. After the extraction system was cooled to room temperature, the IL returned to solid due to the...
The influences of nonionic surfactant on interfacial properties of anionic–nonionic surfactant against alkanes are studied by measuring the dynamic interfacial tension (IFT). The surfactants chosen are fatty alcohol polyoxyethylene carboxylate (C 12 EO 3 C) and fatty alcohol polyoxyethylene (C 12 E 3 ) with various counterions, Na + , Mg 2+ , and Ca...
The spray, flame natural luminosity and soot quantitative measurement by fueling n-butanol and soybean biodiesel were investigated on a constant volume chamber using multi laser diagnostics with high temporal resolution of 15,037 frames per second. The ambient temperature ranged from 700K to 1000K was applied to mimic the diesel in-cylinder environment covering both conventional and low temperature...
As a widely recommended alternative fuel for diesel engines, biodiesel has been proven to be useful for the reduction of emissions from diesel engines, especially particle emissions. Equipped with an on-board engine test bench and a portable emission measurement system designed for mobile tests, this work investigated the emission of a Euro III emission standard heavy-duty diesel engine fueled with...
A comparative study of combustion characteristics and brake thermal efficiency of a diesel engine fueled with diesel and biodiesel (FAME100%) at high altitude (4500m) were conducted. A 6.7L heavy-duty turbocharged, common-rail diesel engine meeting EURO III standard was employed. In this present paper, tests were carried out on an on-board engine bench system in high altitude regions instead of simulating...
Gasoline Homogeneous Charge Induced Ignition (HCII) by diesel uses port fuel injection of gasoline to form a homogeneous charge and direct injection of diesel fuel as an ignition source. Gasoline/Diesel Blend Fuels (GDBFs) uses a premixed blend of diesel and gasoline which is directly injected into the cylinder for combustion. Exploratory studies show that these two ways may integrate the advantages...
Eight kinds of amino acids including L-Serine (Ser), L-Asparagine (Asn), L-Asparticacid (Asp), L-Glutamicacid (Glu), DL-Alanine (Ala), L-lysine (Lys), L-Histidine (His) and L-Arginine (Arg) are tested as substrates of single-chambered air–cathode microbial fuel cells (MFCs) with domestic wastewater as inoculation. Their total organic carbon (TOC) concentrations in solution are standardized as 720mgL...
In the present work, the influences of different types of electrolytes on interfacial dilational properties of anionic surfactant sodium 4,5-diheptyl-2-propylbenzene sulfonate 377 and asymmetrical anionic Gemini surfactant C 12 COONa-p-C 9 SO 3 Na in the absence or presence of 1500ppm partly hydrolyzed polyacrylamide were studied at decane–water interface, respectively, by...
The detailed intake, spray, combustion and pollution formation processes of compression ignition engine with high-octane fuel are studied by coupling multi-dimensional computational fluid dynamic (CFD) code with detailed chemical kinetics. An extended hydrocarbon oxidation reaction mechanism used for high-octane fuel was constructed and a modeling strategy of 3D-CFD/chemistry coupling for engine simulation...
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