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Modelling, comparison and operation experiences of entrained flow gasifier

机译：气流床气化炉的建模，比较和运行经验

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摘要

In this paper a generic entrained flow gasifier is modelled in Aspen Plus using different designs e.g. wet/ dry feed as well as wet and dry quench. The models are verified with the corresponding data from real existing plants or reference data from the literature. All of them are found to reproduce the raw gas composition as well as synthesis gas yield with acceptable deviation. The comparison of the selected designs revealed the poor performance of the wet feed compared to the dry design. The corresponding cold gas efficiency of 72.1% is much lower than the 83% for the dry feed cases. Furthermore the specific synthesis gas production is 12% lower at 12% higher oxygen demand. On the other hand, the power demand for the gasification island is found to be 60-70% lower than in the dry feed case. Therefore the wet feed design is recommended only in case of high pressure gasification. During, an exergy analysis of the different raw gas cooling concepts the disadvantage of the direct quench became obvious. Combinations of gas quench and heat recovery results in exergy losses of 52.4%. The heat recovery design showed much better exergy efficiency of 63.8%. Especially the wet quench design showed high looses and is therefore restricted to applications incorporating a down stream shift unit.
机译：在本文中，使用不同的设计在Aspen Plus中对通用气流床气化炉进行了建模，例如湿/干饲料以及干湿淬火。使用来自实际现有工厂的相应数据或来自文献的参考数据验证模型。发现所有这些都以可接受的偏差再现了原料气组成以及合成气产率。所选设计的比较显示，与干式设计相比，湿式饲料的性能较差。相应的冷气效率为72.1％，远低于干饲料情况下的83％。此外，特定的合成气产量在氧气需求增加12％的情况下降低了12％。另一方面，发现气化岛的电力需求比干进料情况低60-70％。因此，仅在高压气化的情况下才建议使用湿进料设计。在对不同的原料气冷却概念进行火用分析时，直接淬火的缺点变得很明显。气体淬火和热回收的结合导致了52.4％的火用损失。热回收设计显示出63.8％的更好的火用效率。特别是湿式急冷设计显示出较高的松动度，因此仅限于装有下游换档装置的应用。

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