Investigation into compound CaSO4 oxygen carrier for chemical-looping combustion

✍ Scribed by Ning DING; Ying ZHENG; Cong LUO; Qi-long WU; Pei-fang FU; Chu-guang ZHENG

• Book ID: 104453074
• Publisher: Elsevier
• Year: 2011
• Tongue: Chinese
• Weight: 348 KB
• Volume: 39
• Category: Article
• ISSN: 1872-5813
• DOI: 10.1016/s1872-5813(11)60015-7

✦ Synopsis

In this study chemical-looping combustion of methane with compound CaSO 4 oxygen carrier prepared by impregnation method was investigated in a fixed bed reactor. The effects of reaction temperature, CH 4 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 CaSO 4 , and the suitable reaction temperature is around 925 o C. Carbon deposition is inhibited and higher gas conversion is obtained by lower CH 4 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 CaSO 4 oxygen carrier has a higher conversion.

X-ray diffraction analysis reveals that CaSO 4 could be fully reduced into CaS which is also almost oxidized into CaSO 4 .