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An approximate analytical model was established in this study to predict the transient mass flux and ignition time of solid combustibles exposed to time-dependent exponentially increasing heat flux. Critical mass flux was employed as the ignition criterion in the developed model. A new approximation strategy was used to simplify the complicated exact solution and to derive explicit correlations between...
The coal-based solid acid catalysts are synthesized by incomplete carbonization followed by sulfonation approach and their activities in catalyzing esterification of oleic acid with methanol are subsequently investigated. For characterizations of catalyst, N2 adsorption and desorption, ultimate analysis, XRD, SEM, XPS, TG, FTIR and acid amount test are employed. The synthesis conditions are optimized...
Understanding and controlling the gas flow at the nanoscale has tremendous implications in the fields of separation science, catalytic reactions, and energy storage, conversion and extraction. However, the gas flow behavior at the nanoscale is significantly different from that occurring at larger scales. In this work, we focus on a real gas effect, stemming from a strong gas intermolecular interaction...
CNT supported Cu based catalysts were prepared for the selective conversion of biomass-derived furfural to cyclopentanone in aqueous solution. The promotion effect was investigated with the addition of Co, Mo, Zn and Ni in Cu/CNT catalyst. The product distribution was greatly affected by the metal composition. Among those catalysts, CuZn/CNT catalyst exhibited better selectivity toward cyclopentanone...
Modelling soot formation and oxidation in diesel engines has been a long-standing challenge. In this study, soot particle characteristics in terms of particle dynamics, particle size and number density were modelled by integrating a multi-step phenomenological soot model into the KIVA-CHEMKIN CFD code for compression ignition engine combustion simulations. This semi-detailed soot model is dedicated...
The effect of extractable organic matter and solid organic matter on the pore structure of shale from Yangchang Formation in the Ordos Basin, China is investigated in this study. The shale samples were successively crushed, extracted by dichloromethane to remove extractable organic matter, treated by hydrogen peroxide to remove solid organic matter. The porosity, organic and mineralogical characteristic...
In this study, three reduced mechanisms were developed including two reduced primary reference fuel (PRF, n-heptane and iso-octane) mechanisms with different sizes (mechanism 1 (M1) with 51 species and 225 reactions, mechanism 2 (M2) with 43 species and 144 reactions), and one PRF-polycyclic-aromatic-hydrocarbon (PAH) (72 species and 225 reactions) mechanism via a semi-empirical method. M1 and M2...
The application of calcium oxide (CaO) as transesterification catalyst for biodiesel production is restricted due to the requirement of long reaction time and high molar ratio of methanol to oil. To solve this problem, CaO was functionalized with strontium (Sr/Ca catalyst) through the solid mixing method, wet impregnation method, co-precipitation method and improved co-precipitation method, respectively...
Manganese doped CuO–CeO2 catalysts (CuO–MnOx–CeO2) with Mn/Cu molar ratio of 1:5 and variable calcination temperatures were prepared by a hydrothermal method and used for selective oxidation of CO in hydrogen-rich gas, characterized by various techniques. An appropriate calcination temperature shows an essential stimulative effect on CuO–MnOx–CeO2 catalysts for the CO-PROX. The catalyst calcined at...
In recent years, oxy-fuel combustion in coal-fired plants has become one of the most promising technologies for carbon capture and storage (CCS). Compared with air-fired combustion, high concentrations of CO2 and H2O in the flue gas cause a remarkable change in the pulverized coal combustion and heat transfer characteristics in furnace. In this study, improved models for the gas radiative properties...
The paper is aimed at studying the influencing factors of producing ultra-low interfacial tension (IFT) under alkali-free systems, including molecular structures as well as concentrations of double long-chain 1,3,5-triazine surfactants (A-DCTn-8, n=8, 10, 12, 14), temperature, electrolyte, the property of oil phase, and mass ratios of surfactant homologues mixtures. It was found that only A-DCT10-8...
The mineralogical and geochemical characteristics of feed coals and their combustion by-products (fly ash and slag) from Hongyanchi (HONG) and Weihuliang (WEI) coal-fired power plants in Xinjiang Province, Northwest China, were investigated. The enrichment and partitioning behaviour, as well as the leaching potential of the major and trace elements in these combustion by-products were evaluated. Three...
The Lincang (Yunnan Province, Southwest China) and Wulantuga (Inner Mongolia, Northeast China) coal deposits are known because of the high-Ge content. These coals have also a high concentration of a number of other elements. To determine the mode of occurrence of the enriched elements in both coals, six density fractions from<1.43 to>2.8g/cm 3 were obtained from two representative samples...
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