Biomass enhances the reduction of oxidized pellets with carbon monoxide

Dabin Guo; Baihui Cui; Zhihua Chen; Wangwang Yan; Bin Ji; Qi Zhang; Yuhuan Liu; Shiyi Luo; Mian Hu; Roger Ruan

doi:10.1016/j.biortech.2021.124973

Biomass enhances the reduction of oxidized pellets with carbon monoxide

Bioresour Technol. 2021 Jul:331:124973. doi: 10.1016/j.biortech.2021.124973. Epub 2021 Mar 13.

Authors

Dabin Guo¹, Baihui Cui², Zhihua Chen³, Wangwang Yan², Bin Ji⁴, Qi Zhang⁵, Yuhuan Liu⁵, Shiyi Luo⁶, Mian Hu⁷, Roger Ruan⁸

Affiliations

¹ College of Environment, Zhejiang University of Technology, Hangzhou 310032, China; Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, Singapore 637141, Singapore; School of Civil Engineering, Guangzhou University, Guangzhou 510006, China.
² Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, Singapore 637141, Singapore.
³ School of Environment, Henan Normal University, Xinxiang 453007, China.
⁴ Department of Water and Wastewater Engineering, Wuhan University of Science and Technology, Wuhan 430065, China.
⁵ Engineering Research Center for Biomass Conversion, Ministry of Education, Nanchang University, Nanchang 330047, China.
⁶ State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China.
⁷ College of Environment, Zhejiang University of Technology, Hangzhou 310032, China. Electronic address: mianhu@zjut.edu.cn.
⁸ Center for Biorefning and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, USA.

PMID: 33798854
DOI: 10.1016/j.biortech.2021.124973

Abstract

In this study, the reduction mechanism of using CO to reduce biomass-oxidized pellets (BOP) and general-oxidized pellets (GOP) was deeply analyzed. The effect of biomass addition on the reduction of oxidized pellets and the change of reduction kinetics were studied. The addition of 2 wt% biomass into pellets increases pores of the oxidized pellets, promotes the rate of CO entering the pellets and the overflow of CO₂, which results in faster reduction of the oxidized pellets. The reduction reactions of BOP and GOP were controlled by internal diffusion, mixing control and interface control sequentially. Also, addition of the biomass to the pellets decreases the activation energy required for their reduction, from 87.30 to 80.65 kJ·mol^-1. The addition of biomass shortens the reduction time by 3% which can reduce the energy consumption. Therefore, the biomass together with CO enhances the reduction of oxidized pellets and has real environmental benefits.

Keywords: Biomass; Biomass-oxidized pellets; Direct reduced iron; General-oxidized pellets; Mechanisms.

MeSH terms

Biomass
Carbon Monoxide*
Kinetics

Substances

Carbon Monoxide