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The performance of asphalt pavement is seriously affected by aging of asphalt binder, so indices are expected which can not only evaluate aging resistance of asphalt binder but also indicate asphalt mixture performance. The objective of this paper was just to investigate effects of different rheological indices which present tighter and clearer correlation with asphalt mixture performance in evaluating...
High dispersion of Pt nanoparticles encapsulated in hollow Pt@HBZ microreactor has been successfully fabricated through the function of resorcinol-formaldehyde layer during the synthesis process. The low-temperature ethanol steam reforming (LT-ESR) on the Pt@HBZ was studied using various techniques with a focus on the structural characterization of the catalysts, reaction mechanism, and understanding...
To study the influence of different petcoke/lignite (P/L) mass ratios on the static stability of petcoke/lignite water slurry (PCLWS), Turbiscan Lab was employed to quantitatively and objectively characterize the static stability of mixed slurry. Besides, the effect of microwave irradiating the lignite for different times on the static stability of petcoke/upgraded lignite water slurry (PCULWS) was...
Ocean contains huge biomass resources. Actively developing marine biomass resources has great significance to human development. In this work, a kind of seaweed, sargassum, is used to prepare chars by pyrolysis. The sargassum chars are modified by NH4Br reagents using a simple impregnation method, and are applied to capture Hg0 from flue gas. The physicochemical properties of the samples are investigated...
The sorption-enhanced glycerol steam reforming (SE-GSR) provides a promising high-efficient means for hydrogen production. Fluidized bed reactors have their own potential on the heat transfer and sorbent regeneration. To gain a deep insight into the SE-GSR process in fluidized bed reactors, a computational fluid dynamics (CFD) approach is employed in this study. The multi-fluid model is implemented...
The structural evolution of coal during pyrolysis process has been studied for a long time but remains unclear, mainly due to the extraordinary complexity of coal structure. The present study aimed to further identify the chemical structural evolution of different parts in the semi-chars obtained by low-temperature pyrolysis of a Chinese low-rank coal (Shenfu coal). Semi-chars and their solvent extracted...
Both laboratory simulation experiments and thermodynamic equilibrium calculations were conducted to illustrate the retention mechanisms of ash components on three toxic elements (Sb, Se and Pb). The experiment was carried out in a fluidized bed reactor with the combustion temperature in the range of 500–1000 °C. The results shown that the redistribution behavior of these toxic elements was greatly...
Effective porosity is a key factor in subsurface fluid flow. However, lignite is soft, may swell in water (depending on saturation state), and is friable. Thus the conventional saturated water NMR method has challenges when applied to lignite (coal swelling, and fragmentation during the centrification process to remove the pore water. Here an improved experimental method for effective porosity is...
Previous studies show that satisfactory engine performance can be achieved by using both the reactivity stratification combustion (RSC) and the concentration stratification combustion (CSC) fueled with n-butanol. However, the different ignition and combustion characteristics between RSC and CSC have not been well explored yet. In this study, the n-butanol/diesel RSC and n-butanol CSC strategies were...
Fatty acids are considered as a renewable feedstock for the production of high value products such as fuel-range hydrocarbons. Decarboxylation can produce high quality fuels from fatty acids, although either high pressure or additional hydrogen is required. This study investigated a low pressure (<500psi) continuous decarboxylation process examining oleic acid in a continuous fixed bed reactor...
Microscopic and macroscopic impingement characteristics of a single jet were investigated under various flash boiling conditions. The influences of split injection strategy and the related interaction between split injections were studied. The fuel concentration distribution during the impingement process was also quantified. It was found that non-flash boiling condition lead to large secondary droplets...
To understand the detailed catalytic mechanism of ion-exchanging AAEM species on biochar structure and its specific reactivity during CO2/H2O gasification, the experiments were carried out in a laboratory fixed-bed reactor at 800 °C, with two kinds of AAEM-loading methods. The migration and precipitation characteristics of AAEM species was evaluated by ICP-AES, while the transformation of biochar...
To utilize the coal hydroliquefaction residue (CHR), a dual loop reaction system (DLRS) has been developed and upon which the pyrolysis of CHR was conducted under atmospheric pressure. The DLRS combines three reactors, i.e. a fluidized bed pyrolyzer, a radial-flow moving bed filter and a riser combustor followed by a particles grading cyclone. These three reactors form two parallel circulating loops,...
In an entrained flow coal gasifier, the slag viscosity property is of great importance to the slagging process. The slag viscosity is affected by the crystal mineral and the crystallization process has a time effect. The molten slag residence time in gasifier was calculated by slag flow model to estimate the isothermal time or crystal growth time during the cooling process. The residence times of...
A novel in situ tribocatalytic esterification reaction has been developed driven by frictional processes, to alleviate the corrosion wear induced by the high content of organic acid in bio-oil. Solid superacid (SO42−/γ-Al2O3) was formulated and prepared as the catalyst. Acetic acid was as the base for the bio-oil, and glycerol was used as a modifying agent. The tribological properties of the bio-oil...
The molecular dynamics (MD) simulation was used in this study to explain the microscopic process of asphalt self-healing and investigate the influence of temperature on the self-healing capability of asphalt binders. Asphalt average molecular structure models of four types of neat asphalt binders were constructed firstly and a three-dimensional (3D) micro-crack model was further introduced to simulate...
The first coalification jump (FCJ) has a significant impact on low-rank coal reservoir heterogeneity, and is of great importance for coalbed methane (CBM) development. Here, a series of experiments were performed for 10 coal samples collected from eastern Junggar Basin, to compare the material composition, pore structure and adsorption capacity of lignite and candle coal. Contrast with the candle...
The Late Permian Da-long Formation shale in southern China is regarded asa shale gas reservoir target. However, the lack of fundamental data for shale gas reservoirs increases the difficulty of gas exploration. To understand the pore structure characteristics of these shales, a series of experiments was conducted on Da-long Formation samples collected from the Shangsi Section in the Guangyuan area...
In order to study the necessity of hydrogen source at preheating stage of direct coal liquefaction, product distribution, hydrogen consumption, and coal structural change of Hami sub-bituminous coal (HM) with 1-methylnaphthalene (1-MN) and tetralin respectively were investigated under hydrogen and nitrogen atmosphere. The results show that oil could be generated from coal itself with 1-MN under N2...
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