As a kind of by-product in refinery, petroleum coke has not been effectively used for a long time. And many researchers try their best to develop it.

石油焦作为一种迄今为止还未得到有效利用的石油炼制副产物，多年来一直是人们努力开发的对象。

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The reason of low recovery rate of tar in coke product was analyzed; the recovery rate of tar was increased by decreasing the oven-roof temperature and adjusting operating conditions.

分析了焦炭生产中焦油回收率低的原因，通过降低炉顶温度和调整工艺操作，提高了焦油的回收率。

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For the past 18 months engineers have been testing coal, petroleum coke (a refining by-product) and other fuels in the plant, tinkering with the catalyst and gathering data.

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