1 MWth 煤化学链气化过程模拟

基于Aspen Plus建立了1 MWth煤化学链气化模型，探讨了气化过程中不同煤种(宁夏煤、新疆煤、云南煤)、不同载氧体(赤铁矿、锰矿)、温度、氧/碳摩尔比、压力、水蒸气/煤质量比对合成气组分的影响及实现系统自热平衡运行的条件。结果表明：在700~1200 ℃范围内，随着反应温度升高，3种煤合成气产率及冷煤气效率先增加后趋于平缓；水蒸气/煤质量比在0.5~1.5范围内增大、压力在0.1~3.0 MPa范围内增加都会使合成气产率降低；随氧/碳摩尔比在0.1~1.7范围内增大，合成气产率显著降低，系统由外部供热变为向外放热；当系统实现自热平衡运行时，赤铁矿和天然锰矿载氧体的氧/碳摩尔比分别为1.1和1.5；在保证反应速率和经济成本的前提下，优先选择天然锰矿石作为载氧体。

Simulation of 1 MWth Coal Chemical Looping Gasification Process

A 1 MWth coal chemical looping gasification for syngas production simulation was performed with Aspen Plus, and the influence of operating parameters on gasification performance were explored, such as types of coals (Ningxia, Xinjiang and Yunnan coals) and oxygen carriers (Hematite, Manganese ore), temperatures, molar ratios of O/C, pressures and mass ratios of steam/coal. The simulation shows that the temperature increases within the range of 700-1200 ℃, the syngas yield and the cold gas efficiency of all three types of coals first increase and then become stable. The increases of steam/coal mass ratios within 0.5-1.5 and pressures within 0.1-3.0 MPa decrease the syngas yield. When molar ratios of O/C increases within the range of 0.1-1.7, the syngas yield decreases significantly, and the system changes from external heating to outward heat release. When the system achieves auto-thermal operation conditions, O/C molar ratios of hematite and manganese ore are 1.1 and 1.5, respectively. On the premise of ensuring reaction rate and economic cost, natural manganese ore is preferred as the oxygen carrier.