炼油产品结构转型加工路线研究

Case Study on Processing Routes for Product Structure Transformation of Refinery

随着我国石油化工产业快速发展,炼油产能过剩加剧,现有炼厂迫切需要实施炼油产品结构转型。文章以燃料型炼油厂为例对不同转型加工路线进行研究,结果表明,在多产低碳烯烃目标下,该炼厂以催化裂解技术为核心的加工路线(方案1)比以加氢裂化技术为核心的加工路线(方案3),油品收率低5.86个百分点,双烯(乙烯、丙烯)收率高4.14个百分点,油转化深度更高。该厂柴油吸附分离获得的非芳烃柴油相比柴油加氢装置改造后生产的改质柴油链烷烃含量更高,更适宜做蒸汽裂解料,乙烯收率可提高3个百分点。采用渣油加氢+催化裂解+干气制氢组合工艺路线(方案4)比溶剂脱沥青+加氢裂化+油制氢组合路线(方案3)的CO_(2)排放强度减少0.44吨/吨烯烃,同时重油资源得到最大利用,总商品率更高,收益比方案3增加19.3亿元/年,经济收益在各方案中表现最优。

With the rapid development of China's petrochemical industry,overcapacity of refining has intensified.Product structure transformation of refinery is required urgently.This article takes a refinery as an example for product structure transformation,and analyzes the impact of using different transformation processing routes.The results show that under the goal of producing more low-carbon olefins for this refinery,the processing route of catalytic cracking technology(case 1)is better than the processing route of hydrocracking technology(case 3).The refined oil product yield can be reduced by 5.86 percentage points,the diene yield can be increased by 4.14 percentage points,and the"refined oil to chemicals"depth is higher.The ethylene yield of non-aromatic diesel with higher paraffin content obtained by diesel adsorption and separation can be increased by 3 percentage points compared with that of hydrogenated diesel produced by diesel hydrogenation reconstruction unit,and it is more suitable for steam cracking.CO_(2)emission intensity of the combined process route of residual oil hydrogenation+catalytic cracking+dry gas hydrogen production(case 4)can be reduced by 0.44 t/t olefins compared with the combined route of solvent deasphalting+hydrocracking+asphalt hydrogen production(case 3).And the utilization of heavy oil resources is maximized in case 4.Due to the highest total commodity rate,case 4 increases gross profit by RMB 1.93 billion per year compared to case 3,with the best economic benefits among all cases.