CHARACTERISTICS AND COMMERCIAL APPLICATION OF SLURRY BED RESIDUE HYDROCRACKING TECHNOLOGY
The slurry bed residue hydrocracking unit with the largest single design scale(3.0 Mt/a)using imported process technology in China was first started in a company.After 177 days of continuous operation,the 72 h performance calibration test was carried out under the condition of 86％actual processing load.The results showed that using the mixed feedstock of vacuum residue and catalytic cracking slurry with a carbon residue of 23.68％,a metal(nickel+vanadium)mass fraction of 138 μg/g,a sulfur mass fraction of 4.82％,and a C5 asphaltene(n-pentane insoluble substance)mass fraction of 17.65％,under the conditions of a feed rate of 307.2 t/h,a reactor pressure of 15.7 MPa,an average reaction temperature of 428℃,a mass ratio of fresh raw material oil to circulating residue oil at the bottom of the vacuum column of 1.21,a Mo mass fraction of 1 650 μg/g and a gas-holding rate of 26.0％to 27.5％,the conversion rate was 90.0％,the mass fraction of tetrahydrofuran insoluble matter at the bottom of the vacuum column was 7％to 8％,the mass fraction of molybdenum was 2 678 μg/g,and the energy consumption of the unit was 1 906.50 MJ/t.The total pressure drop during the calibration period was 9.53 kPa,which was 25.1 times of the design value,so the unit was difficult to raise the load.To solve the problems of increased pressure drop in the packed bed of the vacuum column and insufficient extraction of gas oil components from the oil residue,the operation of vacuum column could be adjusted and technical transformation of the vacuum column could be tried.
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