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

doi:10.12096/j.2096-4528.pgt.22086

Abstract

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.

Key words: CO₂capture, chemical looping combustion, cycling reaction performance, spray drying granulation, oxygen carrier (OC), agglomeration

CLC Number:

TK 16

Zhenwu MIAO, Laihong SHEN, Haibo ZHAO. Study on Cycling Reaction Performance of Composite Hematite and Copper Ore Oxygen Carrier in Chemical Looping Combustion[J]. Power Generation Technology, 2022, 43(4): 574-583.

Figures/Tables 12

Tab. 1 Chemical composition of copper ore and hematite

赤铁矿		铜矿
成分	质量分数/%	成分	质量分数/%
Fe₂O₃	90.65	Fe₂O₃	59.36
SiO₂	4.73	CuO	34.09
Al₂O₃	1.16	SiO₂	3.08
其他	3.46	Al₂O₃	1.02
		其他	2.45

Fig. 1 XRD pattern of OC

Fig. 2 Schematic diagram of FB-TGA

Fig. 3 Variation curves of mass and attrition rates of OC with time in FB-TGA

Fig. 4 Fresh OC prepared by spray drying granulation

Fig. 5 Mass and pressure drop curves of multiple redox cycles in FB-TGA at 900 ℃

Fig. 6 Net mass loss and mass change of redox reaction in each cycle

Fig. 7 Reaction rates at different redox cycles

Fig. 8 Temperature variation curves in FB-TGA

Fig. 9 Variation curves of bed temperature for five cycles in early, middle and late stages

Fig. 10 Image of OC particles on the bed surface after redox cycles

Fig. 11 Image of OC particles inside the bed after redox cycles

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