Mathematical modeling of fluidized bed combustion. 4: N2O and NOX emissions from the combustion of char

摘要: Abstract Batch experiments were conducted to investigate the emissions of carbon oxides and nitrogen from combustion char prepared a commercial coal in bubbling fluidized bed. Combustion gases escaping surface bed sampled analyzed for N 2 O, NO, NO , CO as function time by means Fourier Transform Infrared Spectrometer. The experimental variables include size loading, inlet oxygen concentration, concentration temperature. A single particle reaction–diffusion model was developed first. detailed chemistry O formation destruction is complex. Homogeneous heterogeneous reactions considered most pertinent included an extension reported earlier. This porous integrated into three-phase hydrodynamic description reactor. system response observation that previous models, including those incorporate details X emissions, are based on two-phase theory fluidization. However, models unable predict gas back-mixing recycle peak solids-mixing. non-isothermality resulting gas-phase taken account through inclusion energy balance bubble phase. effect variation superficial velocity properties cross-flow overall mass balance. Calculations model, homogeneous far particles, compared well with data CO, various conditions. validated then used influence operating conditions conversions char-nitrogen simultaneous propane air/propane mixture fluidizing medium. significant factors found be diameter.