Cryogenic tank configuration and capacity of centrifugal boil-off gas compressors

Roman A. Kazantsev; Казанцев Роман Алексеевич; Ekaterina S. Fateeva; Фатеева Екатерина Сергеевна; Yuriy V. Kozhukhov; Кожухов Юрий Владимирович

doi:10.17816/RF655497

Cryogenic tank configuration and capacity of centrifugal boil-off gas compressors

作者: Kazantsev R.A.¹, Fateeva E.S.¹, Kozhukhov Y.V.¹
隶属关系:
1. ITMO University
期: 卷 114, 编号 1 (2025)
页面: 43-51
栏目: Original Study Articles
URL: https://journal-vniispk.ru/0023-124X/article/view/357922
DOI: https://doi.org/10.17816/RF655497
EDN: https://elibrary.ru/CIBPOB
ID: 357922

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BACKGROUND: During the marine transportation of liquefied natural gas, the transported energy carrier constantly changes its physical state as the gas partly condenses becoming liquid and partly evaporates becoming gas, increasing the pressure in the cargo tanks. The amount of evaporated gas determines the required capacity of the boil-off gas compressors in the boil-off gas reliquefaction unit, which allows the evaporatedliquefied natural gasLNG components to return back to the storage tank.

AIM: To assess and analyze the influence of liquefied natural gas tanker geometry on the intensity of liquefied natural gas evaporation and the capacity of centrifugal boil-off gas compressors.

METHODS: The calculation method compares the liquefied natural gas evaporation rate with the cross-sectional area of filled tanks of various configurations based on heat exchange and thermal insulation, which is a key aspect in the design of cryogenic tanks. The authors use an example of three types of isolated tanks of different shape and height-to-diameter ratio, allowing to evaluate the influence of geometry on the evaporation intensity and to calculate the estimated capacity of centrifugal boil-off gas compressors.

RESULTS: To assess the influence of tank shape on liquefied natural gas volumetric losses, the authors use a model to consider heat gain through insulation and convective heat exchange with the environment. The findings allow to evaluate the influence of the tank design on the amount of generated boil-off gas, improve their design, and reduce the capacity of centrifugal boil-off gas compressors.

CONCLUSION: The analysis and calculations showed that the evaporation surface area directly affects the amount of evaporated boil-off gas and the power consumption of the boil-off gas compressor. The study may be useful for the design and improvement of cryogenic liquefied natural gas storage and transportation systems and for assessing the capacity of centrifugal boil-off gas compressors.

关键词

centrifugal boil-off gas compressor, cryogenic tanks, liquefied natural gas, marine refrigeration equipment, evaporation surface, heat influxes

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Cand. Sci. (Engineering), Associate Professor

俄罗斯联邦, Saint Petersburg

参考

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