Ship Gas Re-vaporizing System Seawater Pressure Control
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Solution Overview
Problem
Existing LNG re-vaporization systems on ships face inefficiencies in energy exchange during the re-vaporization process, leading to wasted energy and challenges in switching between open and closed loop operation types of seawater supply systems without stopping the seawater pump.
Innovation Solution
A gas re-vaporizing system that includes a seawater supply apparatus capable of bi-directional switching between open and closed loop operation types without stopping, using a pressure maintaining device and a heat source heat exchanger to maintain seawater pressure and prevent negative pressure, ensuring continuous operation and efficient re-vaporization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the seawater supply apparatus is switched from open loop operation type to close loop operation type, then continuous operation is achieved, but packing fluid remaining in the circulation connection line causes operational issues
Solution Approach 1:
The circulation connection line is pre-filled with seawater before switching to close loop operation type. The filling device introduces seawater into the circulation connection line in advance, so that when switching occurs, no packing fluid remains to cause operational issues. This preliminary action ensures both continuous operation and reliable switching.
2Device complexity
If seawater pressure is not maintained during switching, then system simplicity is preserved, but negative pressure causes operational interruption
Solution Approach 1:
A pressure maintaining device acts as an intermediary component that actively maintains seawater pressure during operation type switching. This device prevents negative pressure from occurring in the circulation connection line, ensuring continuous operation without interrupting the seawater pump. The pressure maintaining device adds complexity but enables uninterrupted operation.
3Ease of manufacture
If the seawater pump is stopped during switching, then packing fluid removal is simplified, but re-vaporization supply is interrupted
Solution Approach 1:
The system is designed to maintain continuous seawater circulation through the circulation connection line during operation type switching. By pre-filling the line with seawater and maintaining pressure, the seawater pump can continue operating without stopping, ensuring uninterrupted re-vaporization supply while seamlessly transitioning between open and close loop operation types.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables stable and efficient re-vaporization of liquefied gas by preventing negative pressure and maintaining seawater pressure, allowing for non-stop operation type switching and smooth supply of re-vaporized gas to land terminals.
Implementation Method 1
a re-vaporizing apparatus (50) for re-vaporizing the liquefied gas by heat exchange with seawater supplied by the seawater supply apparatus (100)
Implementation Method 2
a pressure maintaining device for maintaining pressure of seawater supplied by the seawater supply apparatus, and preventing negative pressure from occurring
Data Source
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AI summary
According to the present invention, a ship including a gas re-vaporizing system including a re-vaporizing apparatus, which re-vaporizes liquefied gas through seawater supplied by a seawater supply apparatus, supplies a fluid inside a seawater storage tank, which maintains pressure of seawater flowing in a circulation connection line, to the circulation connection line, in order to implement the switch of an operation mode of the seawater supply apparatus from an open loop mode to a close loop mode non-stop.