Liquefied Gas Transfer Device Reducing Boil-Off
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Solution Overview
Problem
Liquefied gas transportation systems experience excessive boil-off gas due to rapid changes in flow rate and pressure drops, particularly when vertically installed pipes discharge gas into low-pressure environments, leading to inefficient transportation and storage.
Innovation Solution
A liquefied gas transportation apparatus featuring vertically installed pipes with a branch pipe and resistor member, such as an orifice plate, to control flow rates and maintain pressure, combined with a check valve to prevent backflow and a fluid mixing device to condense boil-off gas, minimizing boil-off gas generation during transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the liquefied gas flows rapidly through vertically installed pipes, then transportation efficiency is improved, but pressure drops and boil-off gas generation increases
Solution Approach 1:
The pipe system is divided into multiple sections with vertical pipes connected by horizontal connection pipes. This segmentation allows the system to maintain high flow rates for transportation efficiency while reducing pressure drops through distributed flow paths and intermediate storage sections.
Solution Approach 2:
The apparatus introduces gas phase liquefied gas in advance to mix with liquid phase liquefied gas before discharge. This preliminary mixing action reduces the flow velocity and kinetic energy of the liquid phase gas, thereby reducing pressure drops and boil-off gas generation while maintaining transportation efficiency.
2Productivity
If the liquefied gas is discharged to a broad space with low pressure, then loading/unloading speed is improved, but boil-off gas occurs due to rapid pressure reduction
Solution Approach 1:
The system performs preliminary mixing of gas phase and liquid phase liquefied gas in the vertical pipes before discharge. This preliminary action reduces the pressure differential shock when discharging to broad space, minimizing boil-off gas occurrence while maintaining fast loading/unloading speeds.
Solution Approach 2:
The gas phase liquefied gas acts as an intermediary substance that mixes with the liquid phase liquefied gas. This intermediary mixing reduces the direct pressure shock on the liquid phase gas during discharge to low-pressure broad spaces, thereby reducing boil-off gas while maintaining discharge speed.
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 apparatus effectively reduces boil-off gas occurrence, maintaining pressure within the pipes and allowing for efficient loading and unloading of liquefied gases while minimizing boil-off, thus enhancing the transportation process.
Implementation Method 1
since a flow rate or speed of a liquefied gas rapidly changes, a pressure inside the transportation pipes drops and the liquefied gas boils off
Implementation Method 2
when the transportation pipes are vertically installed in such a way that the liquefied gas rapidly drops from tops of the pipes in the direction of gravity
Data Source
AI summary
Provided is a liquefied gas transfer device for reducing boil-off gas. The liquefied gas transfer device for reducing boil-off gas comprises: at least one transfer pipe formed in a vertical direction inside a quay for storing liquefied gas so as to transfer the liquefied gas; a branch pipe which is branched from a lower part of the transfer pipe to one side of the transfer pipe, and which has an end part opened toward a bottom surface of the quay; a valve which is connected to the branch pipe and/or the transfer pipe, and which opens and closes the branch pipe or the transfer pipe so as to move the liquefied gas from the transfer pipe to the branch pipe; and a resistance member disposed inside the branch pipe so as to interrupt the flow of the liquefied gas.