Measurement and theoretical prediction of char temperature oscillation during fluidized bed combustion

摘要: There is experimental evidence of oscillations the char particle temperature during combustion in a fluidized bed (FB), resulting from movement throughout bed. However, most theoretical FB studies assumed to always stay emulsion phase, and existing models do not take into account explicitly. Moreover, it difficult quantify magnitude frequency these with common measurement techniques employed (thermocouple pyrometry optical probe). In this work, single particles (8 mm) beech wood sub-bituminous coal carried out 2-dimensional made quartz, using two O2 concentrations (11 21%v) N2. The time-evolution size different phases are estimated by analysis images new method combining readings digital camera. It found that oscillates hundredths seconds an amplitude varying 10 100 °C, between emulsion, bubble splash phases. increases higher concentration smaller char-particle size. A model developed characterization through as input. burnout time predicted compare well (within 15 %) measurements obtained work literature.