1.8Mt/a RVHT蜡油加氢装置的运转情况及对催化裂化产品分布的影响

OPERATION OF 1.8Mt/a RVHT GAS OIL HYDROTREATING UNIT AND ITS EFFECT ON FCC PRODUCT DISTRIBUTION

介绍了中国石化武汉分公司1.8 Mt/a蜡油加氢装置的运转情况及该装置开工后对催化裂化装置产品分布的影响,对该装置掺炼催化裂化柴油的运转情况以及运转期间装置存在的主要问题进行分析并提出解决方案。工业运转结果表明:该装置采用中国石化石油化工科学研究院开发的RVHT技术及配套催化剂,加工焦化蜡油和直馏蜡油的混合原料,精制蜡油产品的硫质量分数降低到1 000μg/g左右,氮质量分数降低到1 200μg/g左右;将加氢蜡油作为催化裂化原料,相比加工未加氢蜡油时,催化裂化装置的产品分布显著改善,1号催化裂化装置在加氢蜡油掺炼率为89.50%的情况下,汽油收率提高3.590百分点,2号催化裂化装置在加氢蜡油掺炼率为65.53%的情况下,汽油收率提高1.905百分点,柴油收率略有提高,油浆、焦炭、干气等产率均有所降低;蜡油加氢装置掺炼部分催化裂化柴油原料时,反应器温升显著提高,氢耗相应提高,对催化剂活性及运行周期影响较小;装置运行期间,存在反应系统压力波动较大的问题,通过开大循环氢返回线的流量、降低反应器加热炉前气油混合比的方式降低了系统压力的波动。

The operation of the 1.8 Mt/a gas oil hydrotreating unit and the effect on the FCC product distribution in SINOPEC Wuhan Compay as well as the problems using the mixture of LCO and gas oil as the unit feed were introduced. The measures for solving the problems were suggested. The RVHT technology and related catalysts developed by SINOPEC Research Institute of Petroleum Processing were adopted to process the mixed feed of CGO and VGO. The sulfur and nitrogen content of the hydrotreated effluent is less than 1 000 μg/g and 1 200 μg/g,respectively. Compared with the gas oil without hydrotreating,in the cases of feeds containg hydroteated gas oil of 89.50% in 1 # FCC unit and 65.53% in 2 # FCC unit,the gasoline yield increases 3. 590% and 1. 905% ,respectively,though the yield of LCO is not improved significantly, however, the yield of slurry, coke and dry gas decreases. When VGO mixed with FCC LCO is used as hydrotreating unit feed,the hydrogen consumption and the reaction tempera- ture rise markedly,while the effect on the catalysts reactivity and running cycle is less. The fluctuation of system pressure during operation is mitigated by increasing return hydrogen from circulation line and thereby decreasing the hydrogen/oil ratio in reactor inlet.