提升管送风特性对充分发展段压降影响的实验及模型研究

双循环流化床提升管床降随着固气质量比的增加而增加.搭建了双循环流化床实验台,系统地分析了提升管送风特性对充分发展段压降的影响规律.结果发现:充分发展段压降随着提升管风速的增加逐渐增大；径向送入二次风产生的压降比风口切向布置时大；风口高度较低时产生的压降较大；随着二次风口数目增加,压降有增加趋势,设置的4种情况下实测压降...

Research on Effect of Air Characteristics to Riser of DCFB on Pressure Drop of Fully Developed Zone and Prediction Model

Pressure drop in a double circulating fluidized bed riser increased with the solid-gas mass ratio.A DCFB cold-state test bench and a pressure drop model were set up.This paper systematically tested the gas-solid flow pressure drop in fully developed zone affected by air characteristics.It shows that the pressure drop increased with the gas velocity of the riser and the same trend was found when the number of tuyeres increased.The drop was greater when the tuyeres were tangential arranged than it was radial arranged.The pressure gradient emerged a bigger drop when the tuyeres were lower from the distribution.The mean change rate was 12.28%,2.76%,13.16% and 6.96%,respectively in the four circumstances that the paper set.It shows that the tested value had a gap with the value calculated by model in fully developed zone,and the gap differ from affected factors.It showed a lower discrepancy affected by numbers of tuyeres,the mean relative error is 3.13% and the maximum relative error is 3.95%.But the mean relative error and the maximum relative error is comparatively larger affected by heights of tuyeres,which are 4.27% and 5.36%,respectively.