Experimental Study on the Thermal Reduction of CO 2 by Activated Solid Carbon-Based Fuels

Siyuan Zhang, Chen Liang, Zhiping Zhu () and Ruifang Cui
Additional contact information
Siyuan Zhang: State Key Laboratory of Coal Conversion, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Chen Liang: State Key Laboratory of Coal Conversion, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Zhiping Zhu: State Key Laboratory of Coal Conversion, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Ruifang Cui: State Key Laboratory of Coal Conversion, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2024, vol. 17, issue 9, 1-22

Abstract: For achieving CO 2 thermal reduction, a technology combining solid carbon activation and high-temperature CO 2 reduction was proposed, named as activated-reduction technology. In this study, this technology is realized by using a circulating fluidized bed and downdraft reactor. Reduced agent parameters (O 2 /C and CO 2 concentration) greatly affect the reduction effect of CO 2 . In addition, the effect of the activation process on different carbon-based materials can help to broaden the range of carbon-based materials used for CO 2 reduction, which is also an important issue. The following three points have been studied through experiments: (1) the influence of the characteristics of the reduced agent (CO 2 concentration and O 2 /C) on CO 2 reduction; (2) the performance of different chars in CO 2 reduction; and (3) the activation effect of solid carbon. The activation process can develop the pore structure of coal gasification char and transform it into activated char with higher reactivity. The CO concentration in the tail gas is a crucial factor limiting the effectiveness of CO 2 reduction, with an experimentally determined upper limit of around 55% at 1200 °C. If CO concentration is far from the upper limit, temperature becomes the significant influencing factor. When the reduced agent O 2 /C is 0.18, the highest net CO 2 reduction of 0.021 Nm 3 /kg is achieved at 60% CO 2 concentration. When the reduced agent CO 2 concentration is 50%, the highest net CO 2 reduction of 0.065 Nm 3 /kg is achieved at 0.22 O 2 /C. Compared with CPGC, YHGC has higher reactivity and is more suitable for CO 2 reduction. The activation process helps to reduce the differences between raw materials.

Keywords: activated-reduction technology; CO 2 utilization; char; gasification (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/17/9/2164/pdf (application/pdf)
https://www.mdpi.com/1996-1073/17/9/2164/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:17:y:2024:i:9:p:2164-:d:1387295

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().