EN Thermodynamic analysis of the ethylene reliquefaction system on LEG carriers when replacing throttle devices with ejectors
LEG carriers’ energy efficiency can be increased by improving the boil-off gas (BOG) reliquefaction installation processes in its components. In this study, it is proposed to replace the conventional reliquefaction process (CRP) of a LEG carrier “ANTIKITIRA” actual installation equipped throttle dev...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Odesa National University of Technology
2023-03-01
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| Series: | Holodilʹnaâ Tehnika i Tehnologiâ |
| Subjects: | |
| Online Access: | https://journals.ontu.edu.ua/index.php/reftech/article/view/2618 |
| _version_ | 1797688605938810880 |
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| author | Л.І. Морозюк В.В. Соколовська-Єфименко В.О. Єрін О.О. Єфименко А.В. Мошкатюк |
| author_facet | Л.І. Морозюк В.В. Соколовська-Єфименко В.О. Єрін О.О. Єфименко А.В. Мошкатюк |
| author_sort | Л.І. Морозюк |
| collection | DOAJ |
| description | LEG carriers’ energy efficiency can be increased by improving the boil-off gas (BOG) reliquefaction installation processes in its components. In this study, it is proposed to replace the conventional reliquefaction process (CRP) of a LEG carrier “ANTIKITIRA” actual installation equipped throttle devices with an ejector reliquefaction process (ERP) having two-phase ejectors as expansion devices to increase the energy efficiency of the installation. Expansion devices EV2E and EV2R were replaced with two-phase ejectors in the proposed system. The ejector efficiencies are ensured by additional components (separators and the precooler in the bottoming stage of the cascade). Separators maintain a constant pressure at the compressor inlets, and the precooler reduces the load on the condenser-evaporator. An ejector model has been developed to analyze the proposed system. The design pressure at the ejector nozzle outlet is determined based on multivariate calculations. Energy and exergy analyses of ERP and CRP systems were carried out. According to the exergy analysis results, each component's influence on the energy efficiency of the CRP and ERP systems is estimated. The exergy losses in each ERP component are lower than the corresponding values in the CRP components. The exergy losses in the condenser and precooler of the CRP system are lower than in the ERP system. The total power consumption is the same in both cycles, and the cooling capacity of the ERP cycle has increased by 29.1 kW. Replacement of throttle devices led to a decrease in absolute exergy loss from 9.75 to 4.95 kW. The energy efficiency of the ERP cycle increased by 24%, and the exergy efficiency increased by 16%. The most significant exergy losses in both cycles are observed during compression in a two-stage cargo compressor of the bottoming stage of the cascade (29.0-34.1%). It is concluded that the proposed ERP cycle meets IMO requirements for vessel energy efficiency but requires additional capital investments |
| first_indexed | 2024-03-12T01:34:15Z |
| format | Article |
| id | doaj.art-71bc723cbe5341248aba35b9e129b1b7 |
| institution | Directory Open Access Journal |
| issn | 0453-8307 2409-6792 |
| language | English |
| last_indexed | 2024-03-12T01:34:15Z |
| publishDate | 2023-03-01 |
| publisher | Odesa National University of Technology |
| record_format | Article |
| series | Holodilʹnaâ Tehnika i Tehnologiâ |
| spelling | doaj.art-71bc723cbe5341248aba35b9e129b1b72023-09-11T12:04:56ZengOdesa National University of TechnologyHolodilʹnaâ Tehnika i Tehnologiâ0453-83072409-67922023-03-01591405610.15673/ret.v59i1.26182618EN Thermodynamic analysis of the ethylene reliquefaction system on LEG carriers when replacing throttle devices with ejectorsЛ.І. Морозюк0В.В. Соколовська-Єфименко1В.О. Єрін2О.О. Єфименко3А.В. Мошкатюк4Odesa National University of Technology, 112 Kanatna str., Odesa, 65039, UkraineOdesa National University of Technology, 112 Kanatna str., Odesa, 65039, UkraineNingbo Technical University, 1 Qianhu South Road, Ningbo, 315100, ChinaOdesa National University of Technology, 112 Kanatna str., Odesa, 65039, UkraineOdesa National University of Technology, 112 Kanatna str., Odesa, 65039, UkraineLEG carriers’ energy efficiency can be increased by improving the boil-off gas (BOG) reliquefaction installation processes in its components. In this study, it is proposed to replace the conventional reliquefaction process (CRP) of a LEG carrier “ANTIKITIRA” actual installation equipped throttle devices with an ejector reliquefaction process (ERP) having two-phase ejectors as expansion devices to increase the energy efficiency of the installation. Expansion devices EV2E and EV2R were replaced with two-phase ejectors in the proposed system. The ejector efficiencies are ensured by additional components (separators and the precooler in the bottoming stage of the cascade). Separators maintain a constant pressure at the compressor inlets, and the precooler reduces the load on the condenser-evaporator. An ejector model has been developed to analyze the proposed system. The design pressure at the ejector nozzle outlet is determined based on multivariate calculations. Energy and exergy analyses of ERP and CRP systems were carried out. According to the exergy analysis results, each component's influence on the energy efficiency of the CRP and ERP systems is estimated. The exergy losses in each ERP component are lower than the corresponding values in the CRP components. The exergy losses in the condenser and precooler of the CRP system are lower than in the ERP system. The total power consumption is the same in both cycles, and the cooling capacity of the ERP cycle has increased by 29.1 kW. Replacement of throttle devices led to a decrease in absolute exergy loss from 9.75 to 4.95 kW. The energy efficiency of the ERP cycle increased by 24%, and the exergy efficiency increased by 16%. The most significant exergy losses in both cycles are observed during compression in a two-stage cargo compressor of the bottoming stage of the cascade (29.0-34.1%). It is concluded that the proposed ERP cycle meets IMO requirements for vessel energy efficiency but requires additional capital investmentshttps://journals.ontu.edu.ua/index.php/reftech/article/view/2618ethyleneejectorexergy analysisreliquefaction installation |
| spellingShingle | Л.І. Морозюк В.В. Соколовська-Єфименко В.О. Єрін О.О. Єфименко А.В. Мошкатюк EN Thermodynamic analysis of the ethylene reliquefaction system on LEG carriers when replacing throttle devices with ejectors Holodilʹnaâ Tehnika i Tehnologiâ ethylene ejector exergy analysis reliquefaction installation |
| title | EN Thermodynamic analysis of the ethylene reliquefaction system on LEG carriers when replacing throttle devices with ejectors |
| title_full | EN Thermodynamic analysis of the ethylene reliquefaction system on LEG carriers when replacing throttle devices with ejectors |
| title_fullStr | EN Thermodynamic analysis of the ethylene reliquefaction system on LEG carriers when replacing throttle devices with ejectors |
| title_full_unstemmed | EN Thermodynamic analysis of the ethylene reliquefaction system on LEG carriers when replacing throttle devices with ejectors |
| title_short | EN Thermodynamic analysis of the ethylene reliquefaction system on LEG carriers when replacing throttle devices with ejectors |
| title_sort | en thermodynamic analysis of the ethylene reliquefaction system on leg carriers when replacing throttle devices with ejectors |
| topic | ethylene ejector exergy analysis reliquefaction installation |
| url | https://journals.ontu.edu.ua/index.php/reftech/article/view/2618 |
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