FHUDS-5/FHUDS-6/FHUDS-8级配催化剂生产国Ⅴ、国Ⅵ柴油应用分析

Application of FHUDS-5/FHUDS-6/FHUDS-8 Grading Catalysts in the Production of National Ⅴ and National Ⅵ Diesel Oil

中国石化金陵分公司2.5Mt/a柴油加氢装置,以常减压柴油、催化柴油和焦化柴油为原料（催化柴油质量分数不超过20%,焦化柴油质量分数不超过15%）,采用FHUDS-5/FHUDS-6/FHUDS-8级配催化剂,通过新增第二反应器后,降低反应空速至1.0h-1,装置满负荷标定结果表明：FHUDS-6、FHUDS-8催化剂活性较强,装填在反应器上部,有助于多环芳烃的加氢饱和;FHUDS-5催化剂装于二反下床层,充分发挥其在较高温度下的烷基转移超深度脱硫优势,有利于大分子硫化物的脱除;反应系统压降升高,但循环氢压缩机运行稳定,新氢压缩机需要双机运行,需做好管线减震固定措施;在反应器入口温度310℃、反应压力7.4MPa条件下,精制柴油硫含量均低于10mg/kg,闪点高于70℃,凝点低于-4℃,密度平均降低20.523.4kg/m3,均低于845kg/m3,多环芳烃含量在4%左右,十六烷值为51,满足国Ⅴ、国Ⅵ标准;生产国Ⅴ、国Ⅵ柴油的能耗差异主要在于优化换热流程,提高自发蒸汽数量。

The 2.5 Mt/a diesel hydrogenation unit at SINOPEC Jinling Company takes AGO,VGO,LCO and CGO（the mass fraction of LCO and CGO is no higher than 20% and 15% respectively） as the feed and adopts FHUDS-5/FHUDS-6/FHUDE-8 grading catalysts. A second reactor is installed to reduce the reaction space velocity to 1. 0 h-1. The full-load test run results show that FHUDS-6 and FHUDS-8 catalysts,with higher activity, are loaded into the upper part of the reactor to help the hydrogenation saturation of polycyclic aromatic hydrocarbons, and FHUDS-5 catalyst is loaded onto the lower bed of the second reactor to give full play to its advantages of ultra-deep desulfurization by alkyl transfer at high temperature,which is beneficial to the removal of macromolecular sulfides. The pressure drop of the reaction system in-creases, but the recycle hydrogen compressor is operated stably, and dual fresh hydrogen compressors are needed, so shock absorption and fixation measures should be taken for the pipelines. At a reactor inlet temperature of 310 ℃ and a reaction pressure of 7. 4 MPa, the sulfur content of hydrogenated diesel oil is lower than 10 mg/kg, the flash point is higher than 70 ℃, the freezing point is lower than-4 ℃, the density is reduced by 20. 5-23. 4 kg/m3 in average to below 845 kg/m3, the content of polycyclic aromatic hydrocarbons is about 4 %, and the cetane number is 51, meeting the National Ⅴ and National Ⅵ standards. The difference between the energy consumption of National Ⅴ diesel oil production and National Ⅵ diesel oil production is primarily due to the optimization of heat exchange process flow and the increase in sponta-neous steam.