Design of boil-off CO 2 re-liquefaction processes for a large-scale liquid CO 2 transport ship
| Autor: | Chonghun Han, Kyusang Cha, Yeongbeom Lee, Kye Hyun Baek, Sanggyu Lee |
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| Rok vydání: | 2017 |
| Předmět: |
Engineering
Waste management business.industry 020209 energy Scale (chemistry) Process (computing) Refrigeration Liquefaction Fraction (chemistry) 02 engineering and technology Management Monitoring Policy and Law Pollution Industrial and Manufacturing Engineering Power (physics) Refrigerant General Energy 020401 chemical engineering Fractionating column 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering business Process engineering |
| Zdroj: | International Journal of Greenhouse Gas Control. 67:93-102 |
| ISSN: | 1750-5836 |
| DOI: | 10.1016/j.ijggc.2017.10.008 |
| Popis: | This paper studies re-liquefaction properties of CO2 and introduces feasible designs of boil-off CO2 re-liquefaction processes suited for a large-scale transport ship. There are additional design considerations besides re-liquefaction efficiency due to the ship. Firstly, re-liquefaction facilities should be located within a limited space of a transport ship, which induces the number of main equipment as a constraint. Secondly, if an external closed-loop refrigeration is necessary, refrigerants should be re-chargeable and safe. From this perspective, CO2 would be the most appropriate one due to the availability in a liquefied CO2 ship and its safety if it can have similar performance to conventional refrigerants. According to CO2 liquefaction simulation, CO2 as a refrigerant shows similar performance to C3H8 and NH3 with additional 5–7% power consumptions. With this preliminary investigation, four boil-off CO2 re-liquefaction processes for a large-scale transport ship are designed. A re-liquefaction process which employs a distillation column shows 99.7% of re-liquefaction fraction but it has disadvantages of power consumption and the number of main equipment. On the contrary, another re-liquefaction process which has an external closed-loop refrigeration cycle with a CO2 refrigerant meets the re-liquefaction target (>70.0%) with the lowest power consumption. This process also requires nominal level of the number of main equipment and the capital expenditure. Given these results, an external closed-loop CO2 refrigeration cycle based re-liquefaction process is expected to be appropriate for a large-scale liquid CO2 transport ship. Hopefully, the results addressed in this study will contribute to further development of liquefied CO2 transport ships in near future. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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