化学链燃烧中赤铁矿氧载体的本征反应动力学研究

doi:10.3976/j.issn.1002-4026.2017.01.007

Abstract

Abstract:

In this work, the intrinsic kinetics of the first reduction stage of a hematite as oxygen carrier (OC) reduced by carbon monoxide (CO) has been investigated. For the intrinsic kinetics analysis, the BET surface area and the pore size distribution tests showed that the porosity of this kind of OC was 0.031, which revealed that the OC had dense structure with undeveloped pore structure. The temperature programmed reduction experiments were conducted in the thermo gravimetric analyzer, which showed that the reduction of OC was conducted in stages, and the appropriate experimental temperature range for testing the intrinsic kinetics of the first reduction stage was 400~650 °C. Furthermore, a series of formal experiments were conducted in a batch fluidized bed system with different temperatures and different CO concentrations. The intrinsic activation energy and the preexponential factor were determined as 138.55 kJ/mol and 6.8×1013 s^-1 respectively, after the internal and external diffusion factor been eliminated. The analysis to the internal and external diffusion factors deepened the acknowledgement to the reaction properties of this kind of hematite OC reduced by CO. The researching results of this paper had good compatibility with many previous research conclusions such as shrinking core model, external diffusion control and smaller apparent activation energy.

Key words: intrinsic reduction kinetics, hematite oxygen carrier, chemical looping combustion

CLC Number:

TK16

SU Ming-ze, ZHAO Hai-bo, DU Bao-zhou, ZHANG Peng-fei, LIU Zhi-gang. Experimental investigation for the intrinsic reduction kinetics of a hematite as oxygen carrier in chemical looping combustion[J].SHANDONG SCIENCE, 2017, 30(1): 41-51.

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Experimental investigation for the intrinsic reduction kinetics of a hematite as oxygen carrier in chemical looping combustion

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