Exhaust gas economizer on auxiliary engines - A case study of potential savings that can be made by installing an exhaust gas
Notice bibliographique
Résumé
With more expensive bunker oil prices and much tougher environmental requirements, it is of major importance for shipping companies to reduce their consumption of fuel oil today than it ever has been before. There are many ways to lower the consumption; the most efficient would be to reduce the speed of the vessel. This study has however focused on the potential savings that could be made by installing an exhaust gas economizer for the auxiliary engine on board ships. \n\nThe reason why many ships have not installed economizers on their auxiliary engines is because the investment has not been considered necessary before. This work is primarily a case study on the vessel M/V Stena Forecaster, but can probably be seen as a general guideline as well.\n\nOn-board data from the ship and information from manufacturers has been collected, in order to calculate the steam need for the ship during the period of May 2015, as well as how much steam an exhaust gas economizer could produce during the conditions of May 2015. \n\nThe exhaust gas economizer in this study would be installed on a Wärtsilä 9L20C engine, and the economizer selected is an Aalborg XS TC7A from Alfa Laval.\n\nThe result shows the possibilities and potential savings of this investment in terms of lower fuel oil consumption for the auxiliary boilers, the environmental benefits with reduced emissions, a possible installation location and a reasonable pay-back time for the current sailing route. This can however differ widely depending on for example sailing routes and weather conditions. \n\nAn investment of this sort should be discussed having in mind the age of the ship, sailing route, and who pays for the bunker oil. In this particular case the owner does not pay for the bunker, the charter does, and therefore the investment cannot be seen as a direct profit for the owner. However, the ship could be more attractive for future charters if the overall fuel oil consumption is lower. A lower fuel oil consumption is also directly beneficial for the environment.\n
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,002 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,001 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,006 | 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.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».