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The modes in which Na occurs play an important role in its release and catalytic effects during thermal utilization of Zhundong coal. The modes of Na transform with increasing temperature during pyrolysis, but the transformation mechanism remains unclear. In this study, an acid-washed coal was used as a substrate to eliminate the influence of Na inherently present in the raw coal. Na2SO4, NaCl, NaHCO...
This study aims to clarify the effects of inherent inorganic sodium salts present in Zhundong coal on the morphology, element composition, structures, and reactivities of chars from fast pyrolysis. The concentration of the main anions present in the raw coal determined by ion chromatography indicates that Na could exist in the forms of NaCl, Na2SO4, NaNO3, CH3COONa (NaAc), and NaHCO3, which were then...
Exhaust gas recirculation (EGR) stratification contributes to simultaneous reduction of NOx and smoke emissions. For better understanding and management of EGR stratification, the distribution and evolution of intake and residual gas species inside diesel engine are investigated with numerical simulations. The simulations were initialized with the measured values of CO2 stratification experiments...
Super fine pulverized coal combustion is a new pulverized coal combustion technology which has better stability, higher combustion efficiency and lower NO x and SO 2 emission than that using conventional particle sizes. In this paper we applied fractal analysis based on power spectral density (PSD) and slit island method (SIM), three-dimensional (3D) surface roughness measurement and...
A three-component particle-dynamics anemometer is used to measure the characteristics of two-phase gas/particle flows in the near-burner region for a centrally fuel rich swirl coal combustion burner using a gas/particle two-phase test facility. Velocities, mean particle diameters and particle-volume flux profiles were obtained. The primary air and glass beads partially penetrate the central recirculation...
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