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In this study, a simple and yet novel methodology based on the use of modified inclined plane (M-IP) has been established and validated to determine the high-temperature slag viscosity. Seven synthetic standard ash samples have been tested on the inclined corundum plane, under the conditions of reducing environment of 1% CO in nitrogen, 1100 °C–1400 °C, 25°–90° and different duration time of 10–40 min...
The effect of dissolved gases in natural water on the flotation behavior of coal was investigated by a combination of flotation tests, dynamic froth stability measurements, pulp rheology measurements, settling tests and induction time measurements. Better flotation performance with a lower dynamic froth stability (DFS) value was achieved in natural water compared to degassed water. Both pulp rheology...
Thickened flame (TF) model is one of the effective methods to resolve the flame front in turbulent premixed combustion modeling. The multi-step reaction mechanism is becoming increasingly important for combustion simulations such as pollutant formation, ignition and extinction. The effect of TF model on flame structures when coupling with multi-step reaction mechanism was investigated. The simulation...
Gas leakage fire is increasingly common with urbanization and industrialization. Understanding of the entrainment behavior of the jet flame is significant to improve the fuel security management and fire prevention strategy. Many studies have been done in still air and limited studies have focused on the air entrainment of the jet flame under crossflow. This work firstly deduced an expression of the...
In the present study, a novel route of upgrading lignin pyrolysis vapor to aromatic hydrocarbons was investigated. Guaiacol was used as model compound to investigate the coupling conversion of pyrolysis vapor and methanol. Co-feeding methanol obviously facilitated the conversion of guaiacol to aromatic hydrocarbons and inhibited coke formation. HZSM-5, Al-MCM-41 and γ-Al2O3 catalysts were screened,...
The O3/H2O2 advanced oxidation process (AOP) was, for the first time, utilized for low-temperature NOX removal. The present method has a high NOX removal, which is 58% higher than the sum of that for single O3 and H2O2 method with O3/NO molar ratio of 0.5. Besides, much O3 consumption, together with operating costs will be saved. The improved activity in O3/H2O2 is due to the increased generation...
Mn, Fe, Mo or W as a promotor was introduced into ZrO2-TiO2-Al2O3 (ZTA) composite oxides by impregnation method, in order to examine the influence of these promotors on catalytic activity and coking behaviors during n-decane cracking. The as-prepared catalysts were characterized by several different techniques: N2 adsorption –desorption, X-ray diffraction (XRD), temperature programmed desorption of...
Dramatic fluctuations in gas compositions will affect end-users. At current stage, studies on interchangeability indices, which are commonly utilized to characterize the interchangeability of natural gas, can resolve the dilemma. However, the existing studies mainly focused on conventional atmospheric burners, and it tends not to be suitable for fully premixed appliances because of different combustion...
Although coalbed methane (CBM) poses potential safety hazards in coal mines, it can also be used as a clean energy source. Optimization of the borehole length to maximize gas drainage and efficient use of human and material resources are key factors that determine the feasibility and cost of CBM production. In addition, three geo-stress zones are commonly formed in front of the working face due to...
To help solve flow mal-distribution and cooling capacity utilization problems in parallel cooling channels of SCRamjet, the variable channel sectional area design is put forward. 3D modelling of the flow and heat transfer in multiple parallel channels is carried out under supercritical pressure. The flow distribution reasonability and cooling effect under different channel sectional area designs are...
Being a promising potential source for natural gas, methane hydrate (MH) is attracting increasing interest due to its great amount and diverse geographic distribution. The formation of MH is significantly influenced by the properties of sediment media such as porosity and permeability. In this study, in order to have a better understanding on the relationship between MH formation behavior and sediment...
Storage period is an important storage-stability index of endothermic hydrocarbon fuels. In this work, the accelerated oxidation method was used to predict the storage period of fuels at room temperature. The amount limit of hydroperoxide number (8 ppm) is the criterion for judging the fuel deterioration. Therefore, the relationship between heating time corresponding with 8 ppm of hydroperoxide number...
Thermal cracking is an important step of heavy tar processing, in which covalent bonds are initially cleaved to form free radical fragments. The free radical fragments, namely the reactive intermediates, react with each other to form lighter products and coke. Quantity and activity of these reactive radicals determine the products distribution and process operation. Since few studies can be found...
This study applied the high temperature stage microscope to investigate coal char combustion in air (O2/N2) and O2/CO2 (volume, 21%/79%) atmospheres with the effect of gasification. A reaction front combustion model was also proposed, coupled with effect of char gasification, to predict the key parameters of char combustion in the O2/CO2 atmospheres. The combustion process and particle evolution of...
In heavy oil reservoirs, steam channeling and steam override seriously decrease oil production and the ultimate oil recovery during steam flooding. Aiming at the two problems, some experiments were carried out to analyze the EOR mechanisms through injecting foaming agents along with steam injection in heavy oil reservoirs. An orthogonal method was employed to analyze the multiple factors on foam’s...
Nitrogen oxides are harmful to human health and environment. In this study, the oxidation removal of NO through a new in situ Fenton (IF) system was investigated. The independent effects of gas flow rate, initial pH, Fe2+/H2O2 molar ratio and reagent temperature were discussed preliminarily. For the first three factors, the oxidation efficiencies of NO increased with the increase of the values and...
Although numerous studies on CO2 gasification during coal char combustion have been documented, the effects of CO2 gasification on high-temperature carbon oxidation, which is important for evaluation of carbon conversion during pulverized coal combustion under oxy-fuel and flue gas recirculation conditions, are unclear. Thus, the char conversion characteristics at various contents of O2 and CO2 were...
The butanol-diesel blended fuel possesses broad application prospects in energy industry owing to its excellent properties; thus, studying on flame spread over the blended fuel is of great significance for both scientific meanings and practical guidelines. Several fundamental parameters of flame spread, including the flame spread rate, frequency of flame oscillation, temperature distribution, and...
The spontaneous combustion of coal, if not eradicated immediately, may lead to coal ignition and even a full-blown fire. A new method, DSC Inflection Point (DSCIP), was proposed to determine the coal auto-ignition temperature (CAIT). Heat fluxes and kinetic parameters before and after CAIT were comparatively investigated through TG/DSC analysis and mathematical model construction. Meanwhile, the impacts...
Triboelectrostatic separation of vitrinite and inertinite depends on their differences in tribocharging behavior. In the present study, charge-to-mass ratios of two macerals with six tribocharging materials, i.e., aluminum, stainless steel, copper, polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyamide (PA) were conducted for the first time under various environmental factors. PA was...
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