Experimental study of four-step thermal swing adsorption cycle to upgrade biogas obtained from anaerobic digestion

Energy Storage and Saving Pub Date : 2024-12-01 DOI:10.1016/j.enss.2024.10.001

Jackline Mwende Mutunga , Hiram Ndiritu , Meshack Hawi , Peter Oketch

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引用次数: 0

Abstract

Biogas is a renewable source of energy that when upgraded can be adopted as a reliable and sustainable alternative. This study evaluates the performance of thermal swing adsorption technology applying resistive heating, in upgrading biogas obtained from anaerobic digestion to biomethane. Commercial coconut shell-based activated carbon was used as an adsorbent in the four-step cycle process to capture carbon dioxide, using a fabricated adsorption model. The influence of minor gas constituents of biogas in carbon dioxide breakthrough curves was analyzed. Dynamic adsorption tests were carried out to evaluate the system performance in carbon dioxide capture. The maximum regeneration temperature of 60 ℃ was found to have peak carbon dioxide concentration of 39% in the waste gas, maximum energy requirements of 0.1538 kWh per cycle, and an energy efficiency of 87%. This is a good trade-off between adsorbent recovery and system energy efficiency. The adoption of thermal swing adsorption technology in biogas upgrading systems is a viable alternative for water-deficient regions.

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四步热摆吸附循环对厌氧消化沼气的升级试验研究

沼气是一种可再生能源，升级后可以作为可靠和可持续的替代能源。本研究评估了采用电阻加热的热变吸附技术将厌氧消化所得的沼气转化为生物甲烷的性能。采用自制吸附模型，以椰壳活性炭为吸附剂，采用四步循环法捕集二氧化碳。分析了生物气中微量气体组分对二氧化碳突破曲线的影响。进行了动态吸附试验，以评价系统在二氧化碳捕集中的性能。最高再生温度为60℃时，废气中二氧化碳峰值浓度为39%，每循环最大需电量为0.1538 kWh，能效为87%。这是吸附剂回收率和系统能源效率之间的一个很好的权衡。在缺水地区采用热变吸附技术进行沼气净化处理是一种可行的替代方案。

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来源期刊

Energy Storage and Saving

CiteScore

4.70

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0.00%

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