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在固定床实验台架上,研究了CaSO4和添加助剂的CaSO4与气体燃料发生反应的特性。结果表明:助剂可大幅度地提高CaSO4的反应活性,缩短反应时间。在950℃下,所有复合载氧体的转化率均超过95%。在还原和氧化过程中,载氧体释放的SO2曲线呈单峰特性,且随温度显著增大;温度对COS的释放没有明显的影响作用。含Ni-Fe的载氧体等转化率下硫的损失率最小。通过程序升温还原、X射线衍射和场发射扫描电镜等表征分析,研究了样品的反应性能,成分与结构变化,并提出了一个可能的催化还原反应和硫释放机制。
In a fixed bed experimental bench, CaSO4 and additive additives CaSO4 gas fuel reaction characteristics. The results show that the additives can greatly improve the reactivity of CaSO4 and shorten the reaction time. At 950 ° C, all composite oxygenates have a conversion of over 95%. In the process of reduction and oxidation, the SO2 curve released by the oxygen carrier showed a single peak characteristic and significantly increased with temperature. The temperature had no obvious effect on the release of COS. The conversion rate of Ni-Fe-containing oxygen carrier and the like has the lowest sulfur loss rate. Through the characterization of temperature-programmed reduction, X-ray diffraction and field emission scanning electron microscopy, the reaction performance, composition and structure of the samples were investigated. A possible catalytic reduction reaction and sulfur release mechanism were proposed.