570 / 2019-01-19 12:10:26

Thermodynamic analysis of chemical Looping reforming of methane using magnetite concentrate as oxygen carrier for hydrogen production

Chemical looping reforming; Hydrogen; Thermodynamic; Magnetite concentrate, Methane.

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Thermodynamic analysis of chemical Looping reforming of methane using magnetite concentrate as oxygen carrier for hydrogen production
Chunqiang Lu1 Xing Zhu1 Liangpeng Zeng1 Min Zheng2 Kongzhai Li1*
（1.State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology,Yunnan Kunming 650106,China, 2. Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology,Yunnan Kunming 650093，China）
*Corresponding author: Kongzhai Li, Contact address: Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China, Phone/FAX: 86 871 65153405, E-mail address: kongzhai.li@foxmail.com; kongzhai.li@aliyun.com (Kongzhai Li).

Abstract: Chemical looping reforming of methane is a novel technology for co-generation of syngas and hydrogen. In this paper, the possibility of chemical looping reforming of methane using magnetite concentrate as oxygen carrier was investigated by a commercial software (HSC Chemistry 5.11) and experiments. The results showed that higher temperature is beneficial for the reduction of iron oxide and the formation of carbon deposition, but it had a greater influence on the reduction reaction of Fe2O3 with methane. High reactivity and weak formation of carbon deposition can be obtained a range of reaction temperature from 700 to 800℃. The negative influence of C and Fe3C formed in the reduction process on the quality of produced hydrogen can be inhibited by controlling the water vapor reaction temperature. The FeTiO3, FeTi2O5 and Fe2TiO5, which are formed by the reaction of iron species with the impurities such as Si and Ti, can participate in water vapor reactions. But FeAl2O4 and MgFe2O4 are irreversible, resulting in the loss of reducible iron species. It is found that syngas with a ideal ratio of H2 and CO can be obtained by the reaction of methane with magnetite concentrate at 800℃, and the formation of carbon deposition was inhibited in this condition. The thermodynamic calculations agree with the experimental results, indicating that the chemical thermodynamics analysis method can be used as a guiding method for the reaction characteristics studies of chemical looping reforming of methane using magnetite concentrate as oxygen carrier for hydrogen production. This work gives full evidence to the feasibility of using magnetite concentrates as low-cost oxygen carrier for the chemical looping reforming of methane system.
Key words: Chemical looping reforming; Hydrogen; Thermodynamic; Magnetite concentrate, Methane.