生物质化学链气化联合燃气轮机发电系统模拟

使用Aspen Plus软件对以Fe_2O_3为载氧体的生物质化学链气化系统进行模拟,分析温度、压力、载氧体与生物质摩尔比、水蒸气与生物质摩尔比等因素对合成气制备的影响;对不同生物质的气化条件进行优化;将气化制得的合成气通入M701F燃气轮机中发电,考察系统的发电效率。结果表明:常压下,不同生物质气化的优化温度均在740℃左右,此时制备的合成气冷煤气效率较高;提高反应压力有利于系统热量自平衡,但合成气的冷煤气效率降低;载氧体与生物质摩尔比的优化值与生物质中氧碳摩尔比呈负相关,且达到优化值时,气化环境中氧碳摩尔比在1.25左右;水蒸气通入气化系统后冷煤气效率可提高15.00%～20.00%,主要原因为H_2的产量显著增加,通入水蒸气后的气化环境的氧碳比在1.4左右时,制备合成气的冷煤气效率较高;系统的发电效率在30.00%～37.00%,高于生物质发电效率。

Simulation of power generation system with biomass chemical looping gasification and gas turbine

Biomass chemical looping gasification using Fe2O3 as oxygen carrier was simulated by Aspen Plus process simulation software. The effects of temperature, pressure, molar ratio of oxygen carrier to biomass and mo-lar ratio of steam to biomass on syngas preparation were investigated. The gasification conditions of differ-ent biomass were optimized. Meanwhile, syngas was put into M701F gas turbine and the system efficiency was examined. The results indicated that the optimal gasification temperature for different biomasses is around 740°C under normal pressure. The cold gas efficiency is higher at that temperature. Increasing the pressure is conducive to the heat balance without extra energy. However, the cold gas efficiency is reduced. The optimal molar ratio of oxygen carrier to biomass is negatively related to the molar ratio of oxygen to carbon in the biomass. At the optimal molar ratio, the molar ratio of oxygen to carbon in the gasification environment is about 1.25. After passing steam into the gasification system, the cold gas efficiency is in-creased by 15% ~ 20%, mainly due to the significant increase in H2 yield. The cold gas efficiency is higher when the molar ratio of oxygen to carbon in the gasification environment is about 1.4 after passing steam into system. The power efficiency of the system is in the range of 30%~37%, which is slightly higher than that in current biomass power generation.