Study on Cycling Reaction Performance of Composite Hematite and Copper Ore Oxygen Carrier in Chemical Looping Combustion

Abstract

The low reactivity and low cycle stability of single natural oxygen carrier (OC) limit its application in industry. Composite OC of hematite and copper ore was prepared by spray drying granulating method, and the chemical looping combustion (CLC) cycle test was performed on the fluidized bed thermogravimetric analyzer (FB-TGA). The results show that the attrition rate of OC is relatively high at the initial stage of fluidization due to the presence of some enriched fine particles on the surface of fresh OC particles, and the particle attrition rate is stable at 0.28%/h after 6 min of fluidization. In the process of redox cycle reaction, the mechanical strength of OC is reduced by chemical stress and thermal stress, and the particle attrition and sintering are intensified. In addition, the particle sintering inhibits the oxidation stage, leading to the deep reduction of OC to a lower state, which promotes particle agglomeration and eventual defluidization. Therefore, the reduction of oxygen carrier rate and residence time in fuel reactor is beneficial to the safe operation of OC in industry.

Keywords

• co2 capture
• chemical looping combustion
• cycling reaction performance
• spray drying granulation
• oxygen carrier (oc)
• agglomeration