Investigation on Collection Performances of Plasma Signal for Pulverized Particle Coal Flow in Different Optical Collection

In order to reduce the adverse impact of the inhomogeneous of pulverized coal components,different optical path systems were set up and used to research the collection performances of plasma of pulverized coal by laser-induced breakdown spectroscopy.The coal samples,Shenmuhun,was chosen for experiment.The detected count and stability of special lines of coal in different optical collection were investigated on the self-built two-phase particle flow experiment bench,which was used to produce stable pulverized coal stream.The analysis results show that in the steadily repeat measurements,the counts of the lines collected by back-side are weaker because of the intermediate perforated mirror,while the stability of the lines collected by side are worse because of the position change of plasma along the laser beam,the spatial inhomogeneity of plasma and the blocking effect of pulverized coal.