Carbon Dioxide Capture Using Airlift Pumps
Notice bibliographique
Résumé
Carbon dioxide (CO2) is the main greenhouse gas, remarkably contributing to global warming and climate change. Nonetheless, CO2 is an inevitable output of a vast variety of industries relying on fossil fuels for addressing the energy demand. On the other hand, CO2 is a valuable compound and can be used in many processes; for instance, CO2 plays a vital role in plant growth (i.e., photosynthesis) and it is extensively consumed in greenhouses. Thus, not only is capturing CO2 substantial for protecting the environment but it can also be utilized by many industrial processes. Due to the technical restrictions, CO2 capture and reutilization are typically carried out as separate processes. However, in certain cases, these two processes can be combined and implemented simultaneously; this, in turn, can bring about several advantages such as lower costs and increased sustainability. Greenhouses are among such cases; pure CO2 is utilized in greenhouses to generate CO2-enriched water used for irrigation to increase crop growth and yield. On the other hand, the heating load in greenhouses is typically met by burning natural gas, which is a clean fuel that predominantly produces water vapour and CO2 when combusted, along with minimal levels of NOx. Therefore, there exists an opportunity to develop and apply a technology that can not only capture CO2 but also directly integrate it into plant growth process in greenhouses. A newly designed airlift pump is evaluated for its use as a CO2 capture device while dissolving it into water if operating by exhaust flue gases. A series of experiments were conducted to investigate the impact of volumetric CO2 concentrations (ranging from 10% to 25%) and inlet gas flow rate (5-30 LPM, covering slug, intermittent, and churn flow patterns) on the mass transfer and pumping performance of a 25.4 mm airlift pump operated by a mixture of air and CO2. High-speed imaging as well as a capacitance sensor were used to characterize the gas-water twophase flow structure within the riser pipe of the pump. The results revealed that higher volumetric CO2 concentrations in the feed gas led to higher volumetric CO2 mass transfer coefficients (i.e., faster CO2 dissolution in water). Also, CO2 mass transfer exhibited a proportional increase with inlet gas flow rate in the slug flow regime, followed by an almost constant level in the transitional region to churn flow. Eventually, in churn flow, this variable reaches its peak before experiencing a slight decline as the flow approaches an annular pattern. Moreover, the highest efficiency of the pump as a mass transfer device was achieved in slug flow, while the highest water flow rate was obtained for the churn flow pattern conditions.
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Prédiction distillée sur la base complète
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Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
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