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对循环流化床气化试验系统进行冷态试验研究,改变风量、颗粒粒径、组合粒径等操作参数,掌握固体循环速率Gs、空隙率的变化规律,应用小波模极大法对压差波动信号进行分析。结果表明:随着表观风速的提高,Gs逐渐增大。表观风速大于2m/s时,普通颗粒在提升管底部表现出快速区特征,其压差的模极大值线条数与顶部差不多相等。改变粒径分布范围,细颗粒能够增大Gs的同时,相当份额的粗颗粒在提升管内能表现出底部湍流区、上部快速区的特征,延长了其在床内的停留时间。对应的底部压差波动信号的模极大值线较顶部要多,但随着表观风速的增大,快速区长模极大线位置向后移动。分析结果有助于深入理解增压循环流化床气化的设计、控制和运行。
The circulating fluidized bed gasification test system for cold test, change the air volume, particle size, particle size and other operating parameters, to grasp the solid circulation rate Gs, porosity changes, the application of wavelet modulus of maximal differential pressure fluctuations Signal analysis. The results show that Gs increases with the increase of apparent wind speed. When the apparent wind speed is more than 2m / s, ordinary particles show the characteristics of fast zone at the bottom of the riser, and the number of mode maxima of the pressure drop is almost equal to the top. While changing the particle size distribution range, fine particles can increase Gs, meanwhile, a considerable proportion of coarse particles can exhibit characteristics of bottom turbulence zone and upper fast zone in the riser tube, prolonging their residence time in the bed. Corresponding to the bottom of the differential pressure fluctuation signal modulus maximum line to be more than the top, but with the apparent wind speed increases, the fast area of the maximum mode line position to move backward. The results of the analysis help to understand the design, control and operation of pressurized circulating fluidized bed gasification.