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The porous structure of bituminous coal chars and its influence on combustion and gasification under chemically controlled conditions

机译：化学控制条件下烟煤炭的多孔结构及其对燃烧和气化的影响

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Bituminous chars with a strongly non-uniform porous structure have not been accounted for in existing pore models used to predict reactivity. A new approach has been developed to predict a particle structure parameter used in the random pore model. The reaction rate has been correlated with the carbon burn-off. Six bituminous coal chars were produced by pyrolysis in a pressurised drop tube furnace and their reaction rates were measured under various conditions using a pressurised thermogravimetric analyser. The char morphology and the porous structure of the char particles were obtained using image analysis. The porous structure of char particles was also characterised using mercury porosimetry. It is shown that after high-pressure pyrolysis, most of the char particles are of a high porosity, low surface area and a non- uniform porous structure with a large central void surrounded by a thin shell which will influence apparent char reactivity and ash formation. Image analysis also confirmed that the maceral composition of the coals and the pyrolysis pressure influence char morphology. A maximum reaction rate for each char was observed at a carbon conversion of l0--20 wt/100 during both char combustion and gasification. The particle structure parameters were predicted based on the measured porosity and surface area of macropores and micropores in the particle, and show reasonable agreement with those derived from experimental measurements. The predicted reaction rate agrees well with experimental measurements obtained under various conditions.
机译：在用于预测反应性的现有孔模型中，尚未考虑具有非常不均匀的多孔结构的沥青炭。已经开发出一种新方法来预测随机孔模型中使用的粒子结构参数。反应速率已经与碳燃烧相关。在加压的滴管式炉中通过热解产生了六个烟煤炭，并使用加压的热重分析仪在各种条件下测量了它们的反应速率。使用图像分析获得炭颗粒的炭形态和多孔结构。焦炭颗粒的多孔结构还使用汞孔隙率法进行了表征。结果表明，高压热解后，大多数炭颗粒具有高孔隙率，低表面积和不均匀的多孔结构，其中心空隙被薄壳包围，这将影响表观炭反应性和灰分形成。 。图像分析还证实了煤的显微组成和热解压力会影响炭的形态。在焦炭燃烧和气化期间，在10--20wt / 100的碳转化率下观察到每种炭的最大反应速率。根据测得的颗粒中大孔和微孔的孔隙率和表面积预测颗粒结构参数，并与实验测量值合理地吻合。预测的反应速率与在各种条件下获得的实验测量结果非常吻合。

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