新型提升管进料段内压力脉动强度分布的影响因素

Influencing Factors on Distribution of Pressure Pulsation Intensity in Injection Zone of a Novel FCC Riser

通过大型冷模实验,考察了油剂逆流接触提升管进料段内压力脉动强度的轴、径向分布,并结合射流气浓度分布、预提升气浓度分布和颗粒浓度分布分析了气固间作用特征及其对流动的影响.结果表明,根据喷嘴射流、预提升气及颗粒相对压力脉动的贡献,可将新型提升管进料段沿轴向由下而上分为喷嘴进气上游影响区（H=-0.375^-0.1 m）、喷嘴进气控制区（H=-0.1~0.375 m）及喷嘴进气下游影响区（H=0.375~0.675 m）.进料段内压力脉动相对标准偏差径向分布的模拟值与实验值吻合较好.

The axial and radial distributions of pressure pulsation intensity in a catalyst-feed counter-current contacting injection zone were studied in a large-scale cold model experiment. Combined the distributions of pressure pulsation intensity with the concentration distributions of the feed jets, the pre-lift gas and the particles, the gas-solid interaction characteristics as well as the influence of the pressure pulsation on the flow patterns were analyzed. The results showed that based on the contributions of the feed jets, the pre-lift gas and the particles, the whole feed injection zone can be divided into three parts, the jet gas upstream influence zone（H=-0.375^-0.1 m）, the jet gas controlling zone（H=-0.1~0.375 m） and the jet gas downstream influence zone（H=0.375~0.675 m）. The simulation results of radial distribution of relative standard deviation of pressure pulsation in the injection zone agree well with the experimental data.