Boil-off gas supply device
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Solution Overview
Problem
Conventional boil-off gas supply devices with a common drive source for multiple stages of compression mechanisms struggle to optimally manage the fluctuation between the generation and demand of boil-off gas, leading to inconsistent gas pressure in storage tanks.
Innovation Solution
A boil-off gas supply device with separate drive sources for the first and second compression mechanisms, allowing for independent adjustment of gas compression based on demand and generation, featuring a configuration with spillback mechanisms and pressure sensors for capacity control and return liquefaction to manage pressure within the storage tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple stages of compression mechanism are driven by a common drive source, then device complexity is reduced, but the ability to meet fluctuation in boil-off gas generation and demand is worsened
Solution Approach 1:
The compression mechanism is divided into multiple independent compression units, each driven by its own drive source. This segmentation allows each unit to operate independently based on actual gas demand, resolving the contradiction between simplified structure and operational adaptability.
2Use of energy by moving object
If the amount of driving the compression mechanism is reduced when boil-off gas demand is small, then energy consumption is reduced, but gas pressure in the storage tank rises
Solution Approach 1:
The system dynamically adjusts the operation of compression units based on real-time gas demand and storage tank pressure conditions. When demand is small, not all units are reduced simultaneously - instead, the system selectively operates units to maintain pressure balance, allowing energy reduction without excessive pressure buildup.
Solution Approach 2:
The compression mechanism operation is controlled based on feedback from gas pressure sensors and demand signals. The control system continuously monitors storage tank pressure and adjusts compression unit operation accordingly, preventing excessive pressure rise while optimizing energy consumption.
3Adaptability or versatility
If separate drive sources are used for first and second compression mechanisms, then operation adaptability to gas demand is improved, but device complexity increases
Solution Approach 1:
The compression system is segmented into multiple independent units with separate drive sources, enabling differentiated control strategies for different compression stages based on actual gas conditions and demand patterns.
Solution Approach 2:
Different drive sources allow each compression unit to be optimized for its specific operational requirements and location in the compression sequence, with control parameters tailored to local conditions rather than uniform control.
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
This solution enables optimal operation by matching gas supply to demand, stabilizing pressure within the storage tank and preventing excessive pressure buildup, even during fluctuations in boil-off gas generation and demand.
Implementation Method 1
a first compression mechanism configured to suck in a boil-off gas of the liquefied gas stored in the storage tank and compress the sucked boil-off gas
Implementation Method 2
a second compression mechanism configured to compress the boil-off gas after being compressed by the first compression mechanism
Data Source
AI summary
A boil-off gas supply device is provided with: a storage tank configured to store a liquefied gas; a first compression mechanism configured to suck in the boil-off gas of the liquefied gas stored in the storage tank and compress the sucked boil-off gas; a second compression mechanism configured to compress the boil-off gas after being compressed by the first compression mechanism; a discharge path in which the boil-off gas discharged from the second compression mechanism flows; a first drive source configured to drive the first compression mechanism; and a second drive source that is different from the first drive source and configured to drive the second compression mechanism.