Abstract A purposely built integrated reactor, which comprised a drop tube and a moving bed assembly located at the bottom of the drop tube, combined rapid pyrolysis and in situ volatiles upgrading over char for the production of high-quality tar from coal. Rapid pyrolysis took place when coal particles flowed through the hot drop tube, and then the produced volatiles and char were introduced into the moving bed for further pyrolysis and volatiles upgrading. The operation parameters of rapid pyrolysis alone in the drop tube were first investigated to ensure a high yield of the initial tar for further upgrading in the moving bed. The effects of the temperature and char bed thickness on further pyrolysis and volatiles upgrading were then determined to obtain the optimized operating conditions in the moving bed. Under the optimized conditions, the tar yield could be as high as 11.4 wt% and reached 89.8% of the Gray-King assay yield. The light fraction in the tar and light tar yield reached 69.0% and 7.9 wt%, respectively, which was much better than that obtained from the rapid pyrolysis alone in the drop tube. The experimental results could confirm the feasibility of the integrated pyrolysis-upgrading process for the production of high-quality tar from coal.

中文翻译：

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在集成反应器中从煤生产高质量焦油：在下降管中快速热解，下游挥发物在移动床中通过炭升级

摘要 一个专门建造的集成反应器，包括一个下降管和一个位于下降管底部的移动床组件，结合了快速热解和原位挥发物在炭上的升级，用于从煤生产优质焦油。当煤颗粒流过热滴管时发生快速热解，然后将产生的挥发物和焦炭引入移动床进行进一步的热解和挥发物升级。首先研究了单独在下降管中快速热解的操作参数，以确保初始焦油的高产率，以便在移动床中进一步升级。然后确定温度和炭床厚度对进一步热解和挥发物升级的影响，以获得移动床中的优化操作条件。在优化条件下，焦油产率可高达 11.4 wt%，达到 Gray-King 分析产率的 89.8%。焦油中的轻馏分和轻焦油的产率分别达到 69.0% 和 7.9%，比在滴管中单独快速热解获得的要好得多。实验结果证实了热解-提质一体化工艺在煤制优质焦油中的可行性。