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The secondary atomization behavior and spray flame characteristics of carbonated W/O emulsified fuel were studied. The dissolved CO2 in the carbonated emulsified fuel was able to reduce the bubble nucleation energy needed for secondary atomization. First, the spray characteristics of carbonated fuels were studied in a N2 environment at 923K, using high-magnification shadow imaging of the spray droplets...
In this study, the effects of particle aspect ratio (length/diameter) of a wood cylinder on pyrolysis and gasification characteristics were experimentally investigated. X-ray computed tomography was used to visualize the structure of char with different aspect ratios. Small and uniform pores were observed near the surface, whereas the size and shape of majority of the middle pores were large and random...
An experimental study was performed to investigate pyrolysis products, char morphology, and reactivity of char derived from large wood cylinders. Wood samples with various sizes (i.e. sawdust with particle size <1mm and wood cylinders with a diameter of 8mm) were pyrolyzed under an argon atmosphere to produce char samples using a thermobalance. The final pyrolysis temperature was 1173K and the...
This study experimentally investigated intraparticle secondary reactions of tar during the pyrolysis of woody biomass. For this, pyrolysis products (gas, char, and tar) derived from Japanese cypress sawdust (particle size<1mm) and Japanese cypress wood cylinders (8mm in diameter and 9mm long) were compared. The samples were pyrolyzed in a thermobalance under argon atmosphere. The final reactor...
CO 2 /O 2 combustion of pulverized coal is one of the promising new technology in order to reduce the emission of CO 2 and NO x from coal combustion furnaces. However, several experiments with pulverized coal burners show that temperature and stability of pulverized coal flame is reduced in this condition. CO 2 has distinctive thermodynamic and optical property...
The reaction mechanism of methane activation using non-equilibrium pulsed discharge was largely clarified from the emission spectroscopic study and experiments with higher hydrocarbons and some kinds of isotopes. The strong emission of atomic carbon and C 2 swan band system was observed as well as H Balmer series emission. This indicates that methane was highly dissociated into C and H by...
Coal combustion with O 2 /CO 2 is promising because of its easy CO 2 recovery, extremely low NO x emission and high desulfurization efficiency. Based on our own fundamental experimental data combined with a sophisticated data analysis, its characteristics were investigated. It was revealed that the conversion ratio from fuel-N to exhausted NO in O 2 /CO ...
A pyrolysis model which can describe the effects of pressure on the evolution of coal-nitrogen has been constructed based on the FLASHCHAIN ( R) model in order to relate the gas release mechanism under high pressure conditions to the polymer reactions in coal. Various kinds of nitrogen-containing gaseous species in the evolved volatiles and their secondary decomposition and coupling processes...
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