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The characteristics of Na2CO3-catalyzed water-gas shift reaction (WGSR) under coal liquefaction conditions were investigated. The reactivity of WGSR could be enhanced by improving water content and initial pressure of CO, owing to the reduced activation energy for WGSR in the high water density and subcritical state. The Na2CO3 had a promoting effect on WGSR, and a synergistic effectbetween Na2CO3...
This paper made a preliminary investigation of CO effects on lignite liquefaction process. The Schütze method coupled with an elemental analyzer was adopted for directly determining the O contents of liquid and solid materials, and the O balance, variation amounts of water, and CO consumptions were calculated quantitatively for liquefaction processes. It was found that the two reactions which were...
The droplet suspension technology was used under the condition of atmospheric pressure and 873K. The n-butanol concentration ranged from 0% to 75% to investigate the effect of n-butanol concentration on the puffing characteristics of a n-butanol-fatty acid methyl esters (FAME) droplet. Experimental results showed that BUT25, BUT50 and BUT75 (BUT’XX’ represented XX% n-butanol by mass fraction in the...
In order to research puffing characteristics of biodiesel-butanol blends, single droplet experiments of BUT25 and BUT75 were conducted under the condition of atmospheric pressure and 800°C. Experimental results showed that BUT25 only demonstrated core mode, while BUT75 demonstrated both surface and core mode simultaneously. The core mode was a periodic process including bubble nucleation, bubble expansion...
Although exhaust gas recirculation (EGR) is widely implemented to suppress the NOx, it can increase soot emissions and decrease the thermal efficiency in internal combustion engines. Water-emulsified diesel is a promising alternative approach, as it decreases soot emissions, suppresses NOx formation, and promotes thermal efficiency through improved mixing between the fuel and air. Based on the inhibiting...
The CO2 capture for a kind of magnesium-based sorbent from commercially available magnesium-based materials was carried out for CO2 capture under high pressures (up to 2.5MPa) and moderate temperatures (200–400°C). Simultaneously, the evolutions of its physicochemical structures during cyclic capture were analyzed by an X-ray Diffractometer (XRD), a thermo-gravimetric analyzer (TGA), a scanning electron...
The structure characteristics and gasification activity of residual carbon from entrained-flow coal gasification slag were mainly investigated using a pore structure analyzer, a scanning electron microscopy, a Raman spectroscopy and a thermo-gravimetric analyzer. Simultaneously, a kind of residual carbon from coal chars was used for a reference. Results showed that the residual carbon which was usually...
A novel method for hydrate production named “Five-spot thermal huff and puff (HP-5S)” is designed and employed to investigate the behaviors of hydrate dissociation in the Cubic Hydrate Simulator (CHS). This method uses the thermal huff and puff method in a five-spot well system. In addition, the experiments with the methods of the five-spot thermal huff and puff in conjunction with depressurization...
This study applies the oxygen/recycled flue gas (O 2 /RFG) combustion technology for waste incineration in a laboratory-scale fluidized bed incinerator to investigate the effects of different RFG percentages and O 2 concentrations on the emission characteristics of organic pollutants (PAHs, phenol and benzene hydrocarbons). Experimental results show that most PAHs with high-ring structures...
For mitigating the emission of greenhouse gas CO 2 from general air combustion systems, a clean combustion technology O 2 /RFG is in development. The O 2 /RFG combustion technology can significantly enhance the CO 2 concentration in the flue gas; however, using almost pure oxygen or pure CO 2 as feed gas is uneconomic and impractical. As a result, this study...
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