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首页> 外文会议>US Combustion Meeting; 20070325-28; San Diego,CA(US) >Predicting Product Gas Compositions From Coal Gasifiers Operated at Moderate Temperatures
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Predicting Product Gas Compositions From Coal Gasifiers Operated at Moderate Temperatures

机译：在中等温度下运行的煤气化炉中预测产品气体成分

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摘要

The Power Systems Development Facility (PSDF) is a 10 MW_(th) circulating fluidized bed coal gasifier that operates at 2 to 4 MPa and 850 to 1000 ℃ with subbituminous and bituminous coals. This paper presents a detailed chemical reaction mechanism developed to predict product gas compositions from the PSDF, and the shifts due to variations in O_2/coal, steam/coal, coal quality, temperature, and pressure. Detailed volatiles compositions from FLASHCHAIN~R were coupled to a finite-rate mechanism for tar decomposition; versions of the Carbon Burnout Kinetics (CBK) model for char oxidation and steam gasification; and an elementary reaction mechanism for fuel gas reforming chemistry. Heuristic connections were only required for PAH hydrogenation, due to an inadequate database on the kinetics. Predicted gas compositions accurately depict the measured shifts in product gas compositions for broad ranges of O_2/coal and steam/coal, and also for the switch from subbituminous to bituminous coals. Whereas the predicted absolute concentrations of CH_4 were accurate, those for CO and H_2 were underpredicted and steam levels were overpredicted However, the source of these discrepancies remains ambiguous because the test conditions may not have been properly reported or interpreted.
机译：电力系统开发设施（PSDF）是一种10兆瓦（th）循环流化床煤气化炉，可在2至4 MPa和850至1000℃的温度下使用亚烟煤和烟煤。本文介绍了一种详细的化学反应机理，该机理旨在根据PSDF预测产物气体的组成，以及由于O_2 /煤，蒸汽/煤，煤质，温度和压力的变化而引起的变化。将FLASHCHAIN〜R的详细挥发物成分与焦油分解的有限速率机制耦合；用于焦炭氧化和蒸汽气化的“碳燃尽动力学”（CBK）模型版本；以及用于燃料气体重整化学的基本反应机理。由于动力学数据库不足，启发式连接仅用于PAH氢化。预测的气体成分可以准确地描述在大范围的O_2 /煤和蒸汽/煤中，以及从次烟煤到烟煤的转换中，产品气成分的测量变化。尽管CH_4的预测绝对浓度是准确的，但CO和H_2的绝对浓度却被低估了，而蒸汽含量却被高估了。但是，由于测试条​​件可能没有得到适当的报告或解释，这些差异的根源仍然不明确。

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