【作者】 田晨； 王勤辉； 杨秋辉； 倪明江； 骆仲泱；

【Author】 Chen Tian,Qinhui Wang,Qiuhui Yang,Mingjiang Ni,Zhongyang Luo State Key Laboratory of Clean Energy Utilization(Zhejiang University), Hangzhou 310027,Zhejiang Province,China

【机构】 能源清洁利用国家重点实验室(浙江大学)；

【摘要】 在截面为0.348 m×0.479m,高为4.9m的循环流化床实验台上,以平均粒径366.2μm的玻璃珠为床料,采用PC6D反射式光纤探针对四个轴向高度截面上不同径向位置处的局部颗粒浓度分布进行了实验测量,考察了床内结构对炉内气固两相流动特性的影响。实验结果表明:在过渡区,受底部炉膛单侧渐扩结构影响,颗粒浓度的径向分布不均,后墙侧颗粒浓度明显高于前墙侧;同时受炉膛矩形截面的影响,炉膛截面长边处的颗粒浓度要明显低于短边处的颗粒浓度;稀相区偏置炉膛出口的布置破坏了炉内气固流动的环核结构,在炉膛左墙和后墙侧形成了颗粒的局部高浓度分布。更多还原

【Abstract】 By using a reflective-type fiber-optic particle concentration probe(PC6D),the radial distributions of the time mean solid-particle concentration were studied in a plexiglas rectangular CFB cold model with the size of 0.348 m×0.479m×4.9m~3 Measurements were carried out with transparent glass bead as bed materials and with two different superficial gas velocity conditions. The experimental results showed that:in transition region,on the influence of expanding cross-section of wear wall,the radial distribution of solid concentration was asymmetry.In the dilute region,the outlet and the corner effect induced the defluxion of the particles movement and the core-annular distribution was broken.A high solid concentration region formed near the left wall and the wear wall.更多还原