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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received February 27, 2018
Accepted July 31, 2018

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Optimization fluidization characteristics conditions of nickel oxide for hydrogen reduction by fluidized bed reactor

Jae-Rang Lee^{1 2} Naim Hasolli¹ Seong-Min Jeon¹ Kang-San Lee¹ Kwang-Deuk Kim¹ Yong-Ha Kim³ Kwan-Young Lee² Young-Ok Park^1†

¹Climate Change Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea ²Department of Chemical Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea ³Department of Chemical Engineering, Pukyong National University, 365 Sinsun-ro, Nam-gu, Busan 48547, Korea

Korean Journal of Chemical Engineering, November 2018, 35(11), 2321-2326(6), 10.1007/s11814-018-0137-2

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Abstract

We evaluated the optimal conditions for fluidization of nickel oxide (NiO) and its reduction into highpurity Ni during hydrogen reduction in a laboratory-scale fluidized bed reactor. A comparative study was performed through structural shape analysis using scanning electron microscopy (SEM); variance in pressure drop, minimum fluidization velocity, terminal velocity, reduction rate, and mass loss were assessed at temperatures ranging from 400 to 600 °C and at 20, 40, and 60 min in reaction time. We estimated the sample weight with most active fluidization to be 200 g based on the bed diameter of the fluidized bed reactor and height of the stocked material. The optimal conditions for NiO hydrogen reduction were found to be height of sample H to the internal fluidized bed reactor diameter D was H/D=1, reaction temperature of 550 °C, reaction time of 60 min, superficial gas velocity of 0.011 m/s, and pressure drop of 77 Pa during fluidization. We determined the best operating conditions for the NiO hydrogen reduction process based on these findings.

Keywords

Fluidized Bed Reactor Superficial Gas Velocity Hydrogen Reduction Reduction Rate Pressure Drop

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