CaO加入条件下煤与CaSO<sub>4</sub>氧载体化学链燃烧的反应性能研究

CaO加入条件下煤与CaSO₄氧载体化学链燃烧的反应性能研究

摘要: 以小型流化床为反应器、水蒸气为气化介质，在CaSO₄氧载体中加入CaO颗粒进行煤气化—氧载体还原反应实验。实验结果表明，添加CaO改善了煤气化—CaSO₄还原反应性能，提高了煤气化—CaSO₄还原反应速率和CO₂生成速率。但CaO添加剂的催化作用随反应温度的提高而减弱。900 ℃是较适宜的反应温度，此温度下加入适量CaO（CaO/CaSO₄物质的量比1.18），气态硫化物释放得到显著抑制，SO₂和H₂S降幅分别为63.19%和27.37%；同时，还能控制CO₂被吸收固化成CaCO₃的比例低于2%。

Abstract: The reactivity between the CaSO₄ oxygen carrier with CaO additive and coal under steam atmosphere was studied in a fluidized bed reactor. The experimental results show that the addition of CaO can improve the performance of both coal gasification and CaSO₄ reduction, and increase the reaction rate of coal gasification and CaSO₄ reduction and the CO₂ generating rate. However, the catalysis of CaO drops as the reaction temperature rises. And the optimum reaction temperature is 900 ℃, at which the releases of gaseous sulfides are remarkably decreased by 63.19% and 27.37% for SO₂ and H₂S, respectively, as the molar ratio of CaO to CaSO₄ is 1.18. Meanwhile, the amount of CO₂ absorbed by CaO can be controlled to less than 2%.