A marine flash steam reliquefaction system

The marine flash steam reliquefaction system addresses inefficiencies in existing systems by employing multi-stage compression and throttling, enhancing reliquefaction efficiency and reducing fuel loss through precise temperature and pressure control.

CN118482535BActive Publication Date: 2025-01-03JIANGNAN SHIPYARD (GRP) CO LTD
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Patent Information

Application Number
CN202410745563.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-06-11
Publication Date
2025-01-03
Estimated Expiration
2044-06-11

AI Technical Summary

Technical Problem

Existing marine flash steam reliquefaction systems suffer from low reliquefaction rates due to insufficient subcooling of condensed liquid cargo, leading to inefficiencies in heat exchange and increased fuel loss.

Method used

A marine flash steam reliquefaction system with a multi-stage compression and throttling process, incorporating low-pressure and high-pressure gas-liquid separators, compressors, and heat exchangers, along with pressure regulating tanks and subcoolers, to enhance liquefaction efficiency and control temperatures and pressures.

Benefits of technology

The system achieves higher reliquefaction efficiency by reducing condensate re-vaporization, optimizing compressor performance, and minimizing fuel loss through controlled temperature and pressure management.

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Abstract

The present application provides a marine flash steam reliquefaction system, comprising a low-pressure gas-liquid separator, a primary compressor, a secondary compressor, a tertiary compressor, a cooler, a pressure regulating tank, a medium-pressure gas-liquid separator, a high-pressure gas-liquid separator, a high-pressure heat exchanger and a subcooler. By compressing and liquefying the flash steam generated in the storage tank, the marine flash steam reliquefaction system can realize the reliquefaction of the flash steam at a higher efficiency, and the re-vaporization ratio of the condensate returning to the storage tank is reduced, which can effectively control the temperature at the inlet of the tertiary compressor and the pressure at the outlet of the tertiary compressor; in addition to the primary throttling and liquid subcooling modes, the marine flash steam reliquefaction system can also perform a secondary throttling mode and a tertiary throttling mode. In the secondary throttling mode and the tertiary throttling mode, the influence of the heat exchange efficiency of the subcooler on the system can be reduced, the temperature of the liquid before entering the storage tank can be reduced, the liquefaction rate of the system can be increased, and the intake and exhaust temperatures of the compressor can be improved.
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Citation Information

Patent Citations

  • Marine liquefied ethane vaporized gas re-liquefaction device

    CN107101456A

  • Marine ammonia boil-off gas reliquefaction system

    CN115468379A