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为了探索不同截面形状斜管对陶瓷球与生物质半焦混合固体颗粒速度分布的影响规律,设计了PIV冷态模拟试验装置。利用PIV技术对陶瓷球(粒径为1、2和3 mm)与生物质半焦不同质量比例(10∶1、30∶1和50∶1)的混合颗粒在3种不同截面形状(圆形、半圆半方形和方形)的斜管中(稳流阶段X=1 190 mm截面)流动规律进行了试验研究。试验结果表明:在3种不同截面形状斜管中生物质半焦轴向时均速度在yd=0~1内形状分布都类似于“磁滞回线”;在混合颗粒质量比例为10∶1时,生物质半焦轴向时均速度分布基本不受截面形状影响,都可以用方管或半圆半方管来近似代替圆管进行试验;而在陶瓷球粒径为1和2 mm时,混合颗粒质量比例为30∶1和50∶1时,生物质半焦轴向时均速度分布受截面形状影响较大,不可以用方管或半圆半方管来代替圆管进行试验。
In order to explore the influence of inclined tubes with different cross-sections on the velocity distribution of ceramic pellets and biomass semi-coke solid particles, a PIV cold simulation test apparatus was designed. The PIV technique was used to investigate the effect of mixing particles of ceramic balls (particle size of 1, 2 and 3 mm) and biomass semi-coke (10:1, 30:1 and 50:1) in three different cross-sectional shapes , Semicircular semicircle and square) of the ramp (steady flow stage X = 1 190 mm section) of the flow was studied. The experimental results show that the shape distribution of the average velocity in the axial direction of biomass semi-coke in three different cross-section inclined tubes is similar to the “hysteresis loop” in the yd = 0-1; Is 10: 1, the average velocity distribution of semi-coke in the axial direction is basically unaffected by the cross-sectional shape of the semi-square tube. 2 mm, when the mass ratio of the mixed particles is 30:1 and 50:1, the average velocity distribution of the semi-coke in the axial direction is greatly affected by the cross-sectional shape, and can not be replaced by the square tube or semi-circular tube instead of the circular tube test.