摘要
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种情况下实测压降平均变化率分别为12.28%、2.76%、13.16%和6.96%。建立了提升管充分发展段压降模型,计算发现:实测压降与计算值存在偏差,风口数目影响下二者的偏差较小,平均相对误差仅为3.13%,最大相对误差3.95%,风口高度影响下差距较大,平均相对误差为4.27%,最大相对误差为5.36%。
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.
出处
《电站系统工程》
北大核心
2011年第5期5-7,共3页
Power System Engineering
基金
国家自然科学基金(50876030)
高校博士点基金(20090036110008)
关键词
提升管
送风特性
充分发展段
压降
模型
riser
characteristics of air supply model
fully developed zone
pressure gradient
model
