求翻译：针对目前国内煤焦油加工工艺的阐述，尤其是煤焦油加氢轻质化的预处理方面，天元化工通过延迟焦化的工艺原理，通过处理前后的结果分析对比，得知煤焦油中的沥青质、胶质、残炭及重金属极大的得到降低，且很好的改善了下游加氢原料的品质，同时降低了原料中的硫、氮含量。生产结果表明：预处理后的油品为后续的全馏分加氢提供了长周期运行的条件。是什么意思？

At present coal tar processing technology for the elaboration, especially in light of the pre-processing of coal tar hydrogenation, the Tianyuan Chemical Principles by delayed coking process by analyzing and comparing the results before and after treatment, that coal tar in the asphalt, resin, carbo

In the context of the current domestic coal tar processing technology of coal tar, and in particular, pre-processing of the hydrogenation of light quality, Tianyuan chemical through delayed coking the technical theory, through the processing of both before and after analysis of the results of the co

In view of the present domestic coal-tar oil processing craft elaboration, the coal-tar oil hydrogenation light electron particle materialization pretreatment aspect, a day Yuan chemical industry the transit delay coking craft principle, through the processing around result analysis contrast, knew i

For currently domestic coal tar processing technology of elaborated, especially coal tar plus hydrogen light of of pretreatment aspects, tianyuan chemical through delay coking of technology principle, through processing before and after of results analysis contrast, learned that coal tar in the of a

For currently domestic coal tar processing technology of elaborated, especially coal tar plus hydrogen light of of pretreatment aspects, tianyuan chemical through delay coking of technology principle, through processing before and after of results analysis contrast, learned that coal tar in the of a