摘要
针对石油焦及其气化余焦的燃烧和流化特性,自建了冷态实验装置。以石英砂颗粒作为固体物料,常温空气为流化介质,在烧焦管内表观气速为3.07~6.63 m/s,颗粒循环强度为24.7~154.2 kg/(m2.s)的条件下,采用DDY型差压变送器和脉冲磷光颗粒示踪法分别测量了烧焦管内的床层轴向平均固含率分布和颗粒停留时间分布规律。结果表明,当表观气速为3.96 m/s时,随着颗粒循环强度的提高,烧焦管相同高度处平均固含率分布增大;当颗粒循环强度为106.5 kg/(m2.s)时,随着烧焦管内表观气速的提高,烧焦管整个高度上的平均固含率分布减小。烧焦管内颗粒的扩散由弥散颗粒扩散和颗粒团扩散组成。建立了烧焦管内床层轴向平均固含率关联式及颗粒的轴向扩散模型,模型的计算值与实验值能较好地吻合。
According to the combustibility and fluidization of petroleum coke and its gasification residual coke,a cold experimental equipment was established.The axial distributions of average solids content and the particle residence time distributions in the coke-burning riser were investigated respectively by using DuoDianYa type pressure difference transducer and pulse phosphor particle tracer method under the condition of the superficial gas velocity from 3.07 to 6.63 m/s and the particle flux from 24.7 to 154.2()kg/(m^2·s),with quartz sand particle as the solid material in the experimental equipment and room temperature air as the flow medium.The results showed that the average solids content at the same height of the coke-burning riser enhanced with increasing the particle flux under the condition of the superficial gas velocity was 3.96 m/s.In addition,the average solids content along the whole height of the coke-burning riser decreased with increasing the superficial gas velocity under the condition of the particle flux was 106.5()kg/(m^2·s).The particle diffusing mechanism in the riser could be explained by the dispersions of dispersed particle and cluster.The mathematical models describing the axial average solids holdup and diffusion of particles in the coke-burning riser were proposed,and the model predictions were in good agreement with the experimental data.
出处
《石化技术与应用》
CAS
2006年第6期444-447,共4页
Petrochemical Technology & Application
关键词
石油焦
气化余焦
石英砂
烧焦管
轴向固含率
停留时间分布
petroleum coke
gasification residual coke
quartz sand
coke-burning riser
axial solids content
residence time distribution
