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针对煤粉流组分分布的不均匀性,研究不同收光方式对煤粉流的激光诱导等离子体的光谱信号收集效果的影响.选用电厂常用燃煤神木混为实验对象,利用自行搭建的气固两相流实验台架产生稳定煤粉流,对比同向收光方式和侧向收光方式下煤的特征谱线信号探测的强度和稳定性.研究结果表明,相同实验条件下,中间穿孔反射镜使同向收光方式下探测的光谱信号强度较弱,而等离子体信号源位置沿激光束轴线的变化、等离子体信号本身沿空间分布的不均匀性及煤粉流的阻挡作用使侧向收光方式下探测的光谱信号稳定性较弱.
According to the inhomogeneity of the component distribution of pulverized coal flow, the effect of different light-receiving modes on the spectral signal collection effect of pulsed laser induced pulverized coal was studied.Selecting the common coal-fired Shenmu as the experimental object, Solid two-phase flow test bed produces stable pulverized coal flow and compares the intensity and stability of the characteristic spectrum signal detection of coal under the same direction of light receiving and lateral light receiving. The results show that under the same experimental conditions, the middle perforation The reflector makes the spectral signal intensity detected by the co-incident light mode weak, and the plasma signal source position changes along the laser beam axis, the non-uniformity of the plasma signal along the spatial distribution and the blocking effect of pulverized coal flow make the side The spectral signal detected in the receiver mode is weakly stable.