煤焦油加氢生产清洁燃料技术的开发

DEVELOPMENT OF HYDROUPGRADING TECHNOLOGY FOR PRODUCING CLEAN TRANSPORTATION FUEL FROM COAL TAR

在中型试验装置上,以煤焦油全馏分为原料,采用加氢精制-加氢裂化两段法工艺技术路线,对煤焦油原料进行加氢提质,以生产清洁燃料。考察了反应温度、压力、空速和氢油比对加氢精制生成油性质的影响规律;并对加氢精制尾油开展了加氢裂化试验,确定了适宜的加氢裂化工艺条件。结果表明:在适宜的工艺条件下,石脑油和柴油馏分总收率超过95%,其中柴油馏分硫质量分数低于10μg/g、十六烷值接近45。加氢精制催化剂2 600h运转稳定性考察期间,产品性质保持稳定。本技术实现了煤焦油轻质化、清洁化利用的目的,具备工业长周期运转的条件。

Two-stage hydroupgrading technology was studied in a pilot plant to produce clean trans- portation fuels from full-range fractions of coal tar. The effect of the process parameters, such as tem- perature, hydrogen partial pressure, LHSV and H2 to oil ratio,on the properties of hydrotreated oil was investigated. The hydrocracking process for the hydrotreated tail oil was carried out to determine the ap- propriate conditions. The results indicate that coal tar could be turned into light clean fuels under appro- priate hydro-upgrading conditions and the total yield of naphtha and diesel is more than 95 ~. The sulfur content in the diesel fraction is less than 10 Ixg/g and its cetane number is close to 45. The stability test of hydrotreating catalyst is conducted for more than 2 600 h,and the product properties remain stable. The hydro-upgrading results indicate that this technology realizes the purpose of clean utilization for coal tar and could be used in commercial unit for long-term operation.