船舶燃料储存舱强制制冷及自平衡式再液化系统

By using a forced refrigeration and self-balancing reliquefaction system in the ship's fuel storage tank, and by employing heat exchange and spray cooling technologies, the safety and energy consumption issues of BOG processing have been resolved, achieving efficient reliquefaction and safe storage of LNG.

CN224517103UActive Publication Date: 2026-07-17GLORY HOLDER LIQUEFIED GAS MASCH (DL) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GLORY HOLDER LIQUEFIED GAS MASCH (DL) CO LTD
Filing Date
2025-08-12
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In the existing process of LNG storage on ships, BOG handling is difficult, conventional reliquefaction systems increase construction costs and high-pressure compressors have high energy consumption, posing safety risks and potential gas leakage hazards.

Method used

The system employs a forced refrigeration and self-balancing reliquefaction system for ship fuel storage tanks. It utilizes components such as low-pressure pumps, spray pipes, heat exchangers, and high-pressure compressors to achieve BOG reliquefaction by exchanging heat between refrigerant and BOG flash vapor, and uses LNG vaporization cold energy to reduce the pressure in the cargo tank.

Benefits of technology

It effectively reduced LNG temperature and tank pressure, increased port accumulator time, avoided high-pressure pump cavitation, and improved safety and energy efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

本实用新型公开了一种船舶燃料储存舱强制制冷及自平衡式再液化系统，低压泵、第一控制阀、过冷换热器、日用罐依次相连，日用罐、高压泵、SBR换热器、绕管气化器依次相连，低压泵经第一控制阀、上喷淋控制阀与上喷淋管相连，货罐、第二控制阀、前置加热器、低压压缩机、后置冷却器、第三控制阀、辅机单元依次相连，后置冷却器、高压压缩机、高压后冷却器、制冷剂热交换器、SBR换热器、过冷换热器、控制阀、下喷淋管依次相连。本实用新型实现了将货罐内多余BOG闪蒸汽进行再液化，降低BOG量从而来降低货罐压力并增加货罐的停港蓄压时间。通过制冷剂来强制冷却BOG闪蒸汽有效降低最终液化LNG温度，从而降低高压泵吸入口的温度避免气蚀。
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Claims

1. A forced refrigeration and self-balancing reliquefaction system for a ship fuel storage tank, characterized in that, The system includes a cargo tank (2), which is equipped with a low-pressure pump (1) and an upper spray pipe (10). The low-pressure pump (1), the first control valve (1a), the subcooling heat exchanger (12), and the day tank (5) are connected in sequence. The day tank (5) is equipped with a lower spray pipe (5a). The day tank (5), the high-pressure pump (4), the SBR heat exchanger (6), and the coiled tube vaporizer (7) are connected in sequence. The low-pressure pump (1) is connected to the upper spray pipe via the first control valve (1a) and the upper spray control valve (10a). Pipe (10) is connected, and cargo tank (2), second control valve (3a), preheater (13), low-pressure compressor (14), aftercooler (15), third control valve (8a), and auxiliary unit (8) are connected in sequence. Aftercooler (15), high-pressure compressor (16), high-pressure aftercooler (17), refrigerant heat exchanger (11), SBR heat exchanger (6), subcooling heat exchanger (12), control valve (9), and lower spray pipe (5a) are connected in sequence.

2. The forced refrigeration and self-leveling reliquefaction system for a ship fuel storage tank according to claim 1, characterized in that, The coiled gasifier (7) is connected to the fuel supply pipe of the main unit.

3. The forced refrigeration and self-leveling reliquefaction system for a ship fuel storage tank of claim 1, wherein, A safety valve (5b) is provided between the cargo tank (2) and the daily use tank (5).