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Thermodynamic equilibrium analysis of coal gasification using Gibbs energy minimization method

机译：吉布斯能量最小化法分析煤气化热力学平衡

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摘要

A thermodynamics analysis of gasification process is performed using the Gibbs energy minimization approach through Lagrange multiplier method. Three different methods of gasification are analyzed to convert bituminous (RTC) coal into syngas (CO and H_2). These methods use air, air-steam and solar-steam, respectively, for gasification. Initially the properties of coal are experimentally determined using bomb calorimeter, simultaneous DSC/TGA Q600 thermal analyzer and Flash 2000 (CHNO-S) analyzer to measure higher heating value, proximate and ultimate composition, respectively. Using the experimental data an empirical formula of coal is derived to formulate a gasification model. The model accounts 44 species in the product that also includes for the solid carbon and sulfur. The result of gasification model is presented in terms of equilibrium composition of product gases with the inclusion of minor. In the end, the cold gasification efficiency is calculated that shows the efficiency of 70.94%, 71.64% and 90.67% for air, air-steam and solar-steam gasification, respectively. The cold gasification efficiency clearly shows an added efficiency for solar-steam gasification process.
机译：气化过程的热力学分析是通过拉格朗日乘数法使用吉布斯能量最小化方法进行的。分析了三种不同的气化方法，将烟煤（RTC）转化为合成气（CO和H_2）。这些方法分别使用空气，空气蒸汽和太阳能蒸汽进行气化。最初，使用炸弹量热仪，同时DSC / TGA Q600热分析仪和Flash 2000（CHNO-S）分析仪通过实验确定煤的性质，以分别测量较高的热值，接近和最终的组成。利用实验数据，推导了煤的经验公式以建立气化模型。该模型说明了产品中的44种，其中还包括固体碳和硫。气化模型的结果以产物气的平衡组成表示，其中包含微量。最后，计算得出的冷气化效率分别为空气，空气蒸汽和太阳蒸汽气化的效率分别为70.94％，71.64％和90.67％。冷气化效率清楚地表明了太阳能蒸汽气化过程的附加效率。

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