物理吸収を用いた省エネ型炭素回収のための多バンドル円筒型クロスフロー中空糸膜コンタクタの流体力学的設計：バイオガス精製への応用

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:膜コンタクタ設計と圧力損失モデリングの新手法を提供し、低圧CO2分離プロセスのスケールアップ研究に有用。

🏢実務担当者:バイオガス精製やCCUS設備の省エネ設計・設備選定の参考になるが、開示実務への直接的影響は小さい。

🏛政策担当者:CCUS・バイオガス分野の技術評価や支援策設計において、省エネ型分離技術の実現可能性を示す参考情報となる。

Carbon capture by physical absorption is attractive because of the low energy required for solvent regeneration, but it is not feasible at near-atmospheric pressure in direct-contact devices such as packed columns due to operational and hydrodynamic constraints. This work presents the hydrodynamic design and modeling of an innovative cross-flow hollow fiber membrane contactor (HFMC) system for CO 2 capture from atmospheric effluents, such as flue gas and biogas, that overcomes these limitations. Pressure drop relationships based on Ergun and Hagen-Poiseuille equations are established respectively in the liquid and gas phase. These are used to develop an original systematic sizing methodology, relating operating constraints and pressure drops to the fiber bundle dimensions. The methodology is applied to estimate the optimal dimensions of the fiber bundles of a biogas upgrading unit based on physical absorption in water at 20°C. In order to limit the gas and liquid pressure drop in the process, the fiber bundles must remain small, with an outer diameter of 0.237 m and a length of 1.15 m for the absorber and even lower dimensions for the two strippers (0.124 m diameter and 0.84 and 0.49 m lengths for the low and high vacuum stripper). This imposes limited flow rates in a given fiber bundle, thus necessitating a numbering-up strategy. The biogas upgrading unit requires the use of 38 fiber bundles in parallel for the absorption, as well as 56 fiber bundles for the low-vacuum stripping and 98 for the high-vacuum stripping, in order to treat the total raw gas flow rate. In order to facilitate the numbering-up, an original multi-bundle design is proposed, involving 19 parallel fiber bundles in a single shell. Three-dimensional CFD simulations numerically support the near-uniform flow distribution in this design without significant extra hydraulic resistance. The total pressure drop of the liquid in the process loop is 0.2 bar leading to a specific energy requirement of the process due to liquid pumping of 0.0087 kWh m −3 G0 NTP . The total specific energy characterizing the carbon capture process, including liquid and vacuum gas pumping, is 0.066 kWh m −3 G0 NTP which is at least three times lower than that of conventional biogas upgrading technologies. This new process enables thus the capture of carbon from low-pressure gas streams with low energy consumption and compact equipment.

• openalex https://doi.org/10.1016/j.ccst.2026.100703first seen 2026-10-12 04:45:15