化学链燃烧中CaSO4复合载氧体的实验研究

采用浸渍法制备CaSO4复合载氧体,在固定床上进行甲烷化学链燃烧实验研究.探讨了还原温度、CH4含量、载氧体的颗粒粒径和质量等因素对还原反应的影响.结果表明,Ni-Fe混合添加剂显著提高CaSO4载氧体的反应活性;合适的还原温度为925℃左右;CH4含量的降低和载氧体质量的增加,将抑制积炭的发生,并获得较高气体转化率;...

Investigation into compound CaSO4 oxygen carrier for chemical-looping combustion

In this study chemical-looping combustion of methane with compound CaSO₄ oxygen carrier prepared by impregnation method was investigated in a fixed bed reactor. The effects of reaction temperature, CH₄ percent, particle size and sample mass on reduction were discussed and an appropriate condition was determined by contrastive experiments. The results show that Ni-Fe mixed additive greatly improves the reactivity of CaSO₄, and the suitable reaction temperature is around 925℃. Carbon deposition is inhibited and higher gas conversion is obtained by lower CH₄ percent and more sample mass. However, the sample particle size has a little effect on the reduction. The long-time reduction-oxidation test demonstrates that compound CaSO₄ oxygen carrier has a higher conversion. X-ray diffraction analysis reveals that CaSO₄ could be fully reduced into CaS which is also almost oxidized into CaSO₄.