Ekanayaka, D., Morosuk, T., Jado, A. (2025). Analyzing Biogas Purification Using Low-Temperature Distillation For CO2 Capture: Exergetic And Economic Evaluation. Journal of Soil Sciences and Agricultural Engineering, 16(5), 123-137. doi: 10.21608/jssae.2025.389083.1292
Dasith Ekanayaka; Tatiana Morosuk; A. Jado. "Analyzing Biogas Purification Using Low-Temperature Distillation For CO2 Capture: Exergetic And Economic Evaluation". Journal of Soil Sciences and Agricultural Engineering, 16, 5, 2025, 123-137. doi: 10.21608/jssae.2025.389083.1292
Ekanayaka, D., Morosuk, T., Jado, A. (2025). 'Analyzing Biogas Purification Using Low-Temperature Distillation For CO2 Capture: Exergetic And Economic Evaluation', Journal of Soil Sciences and Agricultural Engineering, 16(5), pp. 123-137. doi: 10.21608/jssae.2025.389083.1292
Ekanayaka, D., Morosuk, T., Jado, A. Analyzing Biogas Purification Using Low-Temperature Distillation For CO2 Capture: Exergetic And Economic Evaluation. Journal of Soil Sciences and Agricultural Engineering, 2025; 16(5): 123-137. doi: 10.21608/jssae.2025.389083.1292
Analyzing Biogas Purification Using Low-Temperature Distillation For CO2 Capture: Exergetic And Economic Evaluation
1Faculty of Technology, Sabaragamuwa University of Sri Lanka, P.O. Box 02, Belihuloya, 70140, Sri Lanka. 2Institute for Energy Engineering, Technical University of Berlin, Berlin 10587, Germany.
2Institute for Energy Engineering, Technical University of Berlin, Berlin 10587, Germany.
3Mansoura University, Department of Agricultural Engineering, Mansoura 35516, Egypt
Abstract
As the world moves towards significant contributions to alternative energy sources, biogas and biomethane will play a significant role in the future. The biogas upgrading process to produce higher-purity biomethane while producing carbon dioxide as a by-product will find several applications. A low-temperature double-distillation method was developed and analyzed. Three biogas feed systems are discussed with typical biogas methane concentrations of 50%-mol, 60%-mol, and 75%-mol. The nitrogen refrigeration cycle provides the purification process at low temperatures. The design, simulation, sensitivity analysis were conducted using Aspen Plus software; energetic, exergetic, and economic analyses were performed accordingly, as well as improvement options suggested. The three systems with 1000 kmol/hr feed were designed to achieve 98.5%-mol methane purity while producing a higher-purity carbon dioxide stream. The simulations were conducted up to the level of a carbon dioxide-frozen-free environment. With methane content increasing from 50%-mol to 75%-mol in the biogas feed, the following can be achieved: reduction in the total power consumption from 22.97 MW to 20.77 MW and the specific energy consumption from 10.3 MJ/kgCH4 to 6.21 MJ/kgCH4; an increase in overall exergetic efficiency by 3%-point, and reduction in the total revenue requirements for the overall system (i.e., investment, operation and maintenance expenses, and fuel costs) from 259.68 million USD to 239.13 million USD.
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