Experimental investigation and structural optimization prediction of a novel carbon stripper for solid-fuel chemical looping combustion

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-08, Vol.470, p.143955, Article 143955
• Main Authors: Wang, Xiaojia, Gong, Yutong, Shao, Danyang, Chen, Delu
• Format: Article
• Language: English
• Subjects: Carbon stripper; Char; Chemical looping combustion; CO2 capture; Solid fuel
• ISSN: 1385-8947
• DOI: 10.1016/j.cej.2023.143955

•Reveal of the periodic process of particle flow in the CS.•In-depth study of the directional separation mechanism of binary particles.•Establishment of a three-dimensional multiphase model of the CS.•Realization of effective separation with combined structural parameters (up to 93.7%). The addition of carbon stripper (CS) can effectively improve the carbon conversion efficiency in the fuel reactor of solid-fuel chemical looping combustion system. An independent CS system is constructed, and the feasibility of the system is verified through feasibility tests and reference work condition tests. The effects of important conditions on the separation performance of CS are also explored based on the experimental platform. It is found that increasing the main gas velocity and cross-flow velocity in the air reactor can effectively improve the directional separation efficiency of binary particles. On the other hand, based on the Computational Fluid Dynamics platform, the important structural factors, including baffle angle, deflector angle and deflector length of the CS, are studied for the directional separation mechanism of binary particles. The results show that a CS structure with the baffle length of 140 mm, the baffle angle of 110°, the deflector length of 40 mm, and the deflector angle of 60° exhibits good directional separation performance. In this case, the separation efficiency of quartz sand is close to 100%, and that of polyvinyl chloride (PVC) particles can reach a high value of 93.7%, demonstrating the high separation efficiency and promising application prospects of this novel CS.