Study of the CO2 absorption with K2CO3 sorbents in gas-solid fluidized beds based on second-order moment model

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2025-03-31 Epub Date: 2025-02-01 DOI:10.1016/j.powtec.2025.120708

Xi Chen, Shuyan Wang, Nuo Ding, Baoli Shao, Xuewen Wang, Yimei Ma

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Abstract

K₂CO₃ is widely recognized as an effective CO₂ capture material due to excellent adsorption performance and reaction activity. In this study, the second-order moment (SOM) model is employed to simulate the CO₂ adsorption with K₂CO₃ sorbents in a fluidized bed reactor, considering the effect of particle velocity fluctuation anisotropy. The results indicate that the anisotropy can enhance the heterogeneous reaction and improve the CO₂ conversion rate in the reactor. Compared to the kinetic theory of granular flow (KTGF) model, the SOM model is better verified with the experimental results and can more accurately capture flow field heterogeneity and anisotropic characteristics. Quantities such as the particle concentration, velocities, particle second-order moments, Reynolds stresses, temperature and reaction characteristics are presented. Within a specific range, a higher temperature can intensify particle fluctuations and anisotropy, concurrently enhancing both reaction rates and CO₂ conversion rates. These findings provide theoretical insights for optimizing process conditions in CO₂ capture within fluidized bed reactors.

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基于二阶矩模型的K2CO3吸附剂在气固流化床中吸收CO2的研究

由于优异的吸附性能和反应活性，K2CO3被广泛认为是一种有效的CO2捕获材料。本文采用二阶矩（SOM）模型，考虑颗粒速度波动各向异性的影响，对流化床反应器中K2CO3吸附剂对CO2的吸附进行了模拟。结果表明，各向异性可以增强非均相反应，提高反应器内CO2的转化率。与颗粒流动力学理论（KTGF）模型相比，SOM模型能更好地与实验结果进行验证，并能更准确地捕捉流场的非均质性和各向异性特征。给出了粒子浓度、速度、粒子二阶矩、雷诺数应力、温度和反应特性等参数。在一定范围内，温度升高会加剧颗粒波动和各向异性，同时提高反应速率和CO2转化率。这些发现为优化流化床反应器内CO2捕集的工艺条件提供了理论见解。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.