摘要
通过研究FCC催化剂喷雾成形过程中胶体液滴的干燥原理,分析了异形颗粒和粒径小于40μm的催化剂细颗粒产生的原因,设计了一种新结构雾化喷枪来控制异形颗粒产生、减少细粉生成。该新型喷枪可将冷空气引入到喷雾干燥塔内的料液锥状雾化层(雾锥)周围,隔断浆料雾化液滴与入塔高温气氛的直接接触,为雾化液滴建立了一个相对缓和的初始干燥环境。与常规操作相比,使用新型喷枪后催化剂颗粒的球形度明显提高,最大值为0.941,提高了0.013;异形颗粒明显减少;喷雾干燥塔塔下催化剂质量收率提高5.2百分点,生成细粉的体积分数降低约1百分点。
The drying principle of the droplet in the spray forming process of FCC catalyst was studied,and the reason for the formation of irregular particles and fine powder with diameter less than 40μm were analyzed.A new structure spray nozzle was designed to control the formation of irregular particles and reduce the formation of fine powder.The new structure spray nozzle could introduce cold air around the material-liquid conical atomization layer(fog cone)in the spray drying column,and cut off the direct contact between the slurry atomization droplets and the high-temperature atmosphere entering the column.A relatively mild drying environment was established for atomizing droplets.Compared with the conventional operation,the number of irregular particles was obviously reduced and the sphericity of the catalyst particles was obviously improved with the highest value of 0.941(raised by 0.013).At the same time the yield of the catalyst under the spray drying column was increased by 5.2 percentage points,and the production of fine powder was reduced by about 1 percentage point.
作者
张翊
于宁
秦娅
吕庐峰
Zhang Yi;Yu Ning;Qin Ya;Lü Lufeng(SINOPEC Research Institute of Petroleum Processing,Beijing 100083)
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2022年第3期31-36,共6页
Petroleum Processing and Petrochemicals
基金
中国石油化工股份有限公司合同项目(ST14041)。
关键词
催化裂化
催化剂
球形度
细粉
干燥环境
fluid catalytic cracking
catalyst
sphericity
fine powder
drying condition
