By Friberg, Rasmus,
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Additional resources for A new measurement method to analyse the thermochemical conve
No discussion is presented about limitations and assumptions of the method. 3URFHGXUH For each run, the pot was loaded with a bed 125-130 mm deep, with an ignition source (char coal soaked in kerosine) on top of the bed. A low air flow was used during ignition. The ignition front propagating down towards the grate was monitored by thermocouples connected to chart recorders (Figure 7). 5HVXOWV DQG FRQFOXVLRQV Stubington et al observed the parabolic relationship between the volume flux of primary air and ignition rate as well as combustion rate.
It also investigates the potentials to develop an all-round bed model or CFSD code simulating the conversion system. This review also contains a great deal of information on the heat and mass transport phenomena taking place inside a packed bed in the context of PBC of biomass. The phenomena include conversion regimes, pyrolysis chemistry, char combustion chemistry, and wood fuel chemistry. The main conclusions from this review are: • The thermochemical conversion process of a packed bed is too complex to mathematically model and verify within the scope of a PhD project.
Carbon balance P& FJ ω FJ ,& 0& ( = Q& IJ χ IJ ,&22 + χ IJ ,&2 ) (T Hydrogen balance P& FJ ω FJ , + 0 +2 = Q& IJ χ IJ , + 22 − (Q& SD + Q& VD + Q& DO )χ D , + 22 (T Oxygen balance P& FJ ω FJ ,2 0 22 1 1 = Q& IJ χ IJ ,&22 + χ IJ ,22 + χ IJ ,&2 + χ IJ , + 22 L 2 2 − (Q& SD 1 + Q& VD + Q& DO ) χ D ,22 + χ D , + 22 2 (T The sought quantities are not explicitly formulated in these molar balances. However, these equations are the starting points for developing the functional relationship between sought quantities and measurands, according to Eq (1) above.
A new measurement method to analyse the thermochemical conve by Friberg, Rasmus,