Impinging Flame Characteristics in an Opposed Multiburner Gasifier

On the basis of the bench-scale opposed multiburner (OMB) gasifier, industrial light field camera and high speed cameras combined with high temperature endoscopes and image processing technology are proposed and applied to study characteristics of impinging flame height including impinging height and pulsation frequency in coal-water slurry (CWS) gasification. The results show that the mean flame height and the max flame height rise with the increase of mole ratio of oxygen to carbon (O/C) while the general increase trends decrease. The restriction of refractory dome to the flow field in impinging stream recirculation region enhance with the increase of O/C. The impinging flame heights calculated by light field camera combined with axial high temperature endoscope are proved to be reliable. Flame pulsation frequency is investigated by correlation coefficients and frequency spectra calculated from lateral high temperature endoscopes of 90 degrees and 45 degrees optical axis-to-target angle combined with high speed cameras. The characteristic frequency is below 10 Hz and variation ranges in correlation coefficients decrease while the stability of gasification enhances with the increase of O/C. The lateral imaging system of 90 degrees optical axis-to-target angle clearly reflects the stability of gasification while the lateral imaging system of 45 degrees optical axis-to-target angle could reflect the stability of impinging flames in burner plane.