加氢原料对催化裂化烟气SO_x排放影响的中试研究

PILOT STUDY ON INFLUENCE OF HYDROGENATED FEEDSTOCKS ON SO_x EMISSION OF FCC FLUE GAS

在中型提升管催化裂化装置上,选用常规重油裂化催化剂VRCC,对不同加氢深度的重质油在相同试验条件下裂化反应性能和再生烟气SO_2含量进行考察。结果表明:随着原料加氢深度的增加,再生烟气中SO_2浓度由轻度加氢原料时的526 mg/m^3降低到深度加氢原料时的232 mg/m^3;与轻度加氢原料裂化产物相比,中度加氢原料裂化产物中液化气收率增加1.40百分点,汽油收率增加0.89百分点,油浆产率减少2.05百分点,总液体(液化气+汽油+柴油)收率增加1.54百分点,产物分布得到优化。兼顾原料加氢难度和对再生烟气SO_x排放的影响幅度,选择对催化裂化原料中度加氢既可以减少加氢工艺的成本,又可以满足催化裂化对产物分布优化和降低再生烟气SO_x排放的双重要求。

In a pilot riser catalytic cracking unit,conventional heavy oil cracking catalyst VRCC was selected to investigate the cracking reaction performance and the SO2 content of regenerated flue gas of heavy oil feeds with different hydrogenation depths under the same experimental conditions.The results showed that with the increase of hydrogenation depth of raw materials,the concentration of SO2 of rege-nerated flue gas decreased from 526 mg/m3 of mild hydrogenated feed to 232 mg/m3 of deep hydrogenated feed.Compared to mild hydrogenated feedstock,using moderate hydrogenated feedstock,the LPG yield increased by 1.40 percentage points,the gasoline yield increased by 0.89 percentage points,the slurry yield decreased by 2.05 percentage points,and the total liquid product yields increased by 1.54 percentage points.Considering both the difficulty of hydrogenation of raw materials and the influence range on SOx emission of regenerated flue gas,selecting moderate hydrogenated feed for FCC can not only reduce the cost of hydrogenation process,but also meet the dual requirements of FCC on product distribution optimization and reduction of SOx emission of regenerated flue gas.