超低硫清洁柴油生产运行方案的优化措施

分析了炼油企业在生产超低硫清洁柴油过程中存在的困难，以及其对企业经济效益和长周期运行等方面的影响，实施了常压蒸馏塔新增轻蜡油抽出流程的改造，提高全厂生产方案优化调整的灵活性。在此基础上，通过调整延迟焦化装置柴油切割点、优化柴油加氢装置原料配比、减少催化裂化装置油浆产量、调整蜡油加氢和加氢裂化装置负荷、优化常压蒸馏塔加热炉和减压蒸馏塔加热炉操作等一系列措施，使柴油加氢装置催化剂使用周期延长至4年以上，经测算，全厂可增产汽油 107 kt/a，节省燃料气 1 200 t/a，减少氢气消耗 1 500 m³/h，增加经济效益 4 960 万元/a。

OPTIMIZATION OF OPERATION SCHEME FOR PRODUCTION OF ULTRA-LOW SULFUR CLEAN DIESEL

The difficulties existing in the process of producing ultra-low sulfur clean diesel and their effects on the economic benefit and long-term operation of the refinery were analyzed for improving the flexibility of optimizing and adjusting the production plan of the whole plant.On this basis,through a series of measures,such as adjusting the diesel cutting point of delayed coking unit,optimizing the feedstock ratio of diesel hydrotreating unit,reducing the output of FCC slurry,adjusting the load of VGO hydrotreating unit and hydrocracking unit,optimizing the operation of atmospheric and vacuum furnaces,etc.,the service life of catalyst in the diesel hydrotreating unit was prolonged to over four years.By calculation,the total output of gasoline could be increased by 107 kt/a,the fuel gas could be saved by 1200 t/a,and the hydrogen consumption could be reduced by 1500 m³/h.