降低焦比
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decreasing coke rate
降低焦化率
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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