CIESC Journal ›› 2010, Vol. 61 ›› Issue (1): 60-65.
Previous Articles Next Articles
SUN Shaozeng,WANG Zhengyang,DU Mingkun,DENG Qigang,WU Shaohua
Online:
Published:
孙绍增,王正阳,杜明坤,邓启刚,吴少华
Abstract:
The axial pressure drop profile and the radial solids distribution were measured in a circulating fluidized bed for evaluating the effects of return gas-solids stream position on the riser flow properties.The saturation carrying capacity of gas for Geldart B typed particles and the flow mode of return gas-solids stream in the bed were discussed.It was found that arranging the inlet at a higher position of the riser would make the bottom bed leaner when U0 was high and Gs was low.When Gs increased,the longer influenced region of return particles and a small air-staging through lifting the loosening air injection position made the bottom bed become denser significantly.The deceleration and residence of return particles caused a relatively denser but asymmetrical region in the vicinity of inlet.But much more symmetrical solids distribution profile was found in the upper and lower regions far away from the inlet.The effects of inlet height on the flow properties of the riser with air-staging also were analyzed.The secondary air injection below the solids inlet could not cut off the solids exchange in the bed.The bed solids concentration increased when the particles inlet moved to a higher position of the bed when air-staging was adopted.Using CO2 as tracer,the dispersion of the loop-seal-fluidizing air for transmitting the return particles was investigated.It was found that the loop-seal fluidizing air dispersion rate was low but can be enhanced by the secondary air injection.
Key words: 循环流化床, 回料气固两相流, 入口高度, 颗粒浓度分布, 回料风的扩散
循环流化床,
关键词: 循环流化床, 回料气固两相流, 入口高度, 颗粒浓度分布, 回料风的扩散
SUN Shaozeng, WANG Zhengyang, DU Mingkun, DENG Qigang, WU Shaohua. Effect of return gas-solids stream position on flow properties of circulating fluidized bed[J]. CIESC Journal, 2010, 61(1): 60-65.
孙绍增, 王正阳, 杜明坤, 邓启刚, 吴少华. 回料流入口高度对循环流化床提升管流动特性的影响 [J]. 化工学报, 2010, 61(1): 60-65.
0 / / Recommend
Add to citation manager EndNote|Ris|BibTeX
URL: https://hgxb.cip.com.cn/EN/
https://hgxb.cip.com.cn/EN/Y2010/V61/I1/60
Friction between gas-solid suspension and CFB downer wall
CHEN Hengzhi;LI Hongzhong
Hydrodynamics in high-density downer reactor