Boosting system, and boosting method of gas
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Solution Overview
Problem
The existing boosting systems for carbon dioxide require high-pressure after-coolers and expensive variable speed motors, leading to increased power consumption and reduced operation efficiency, especially when cooling carbon dioxide to a pressure less than the critical pressure.
Innovation Solution
A boosting system that compresses gas to an intermediate supercritical fluid, then cools it to an intermediate supercritical pressure liquid, and finally boosts it to the target pressure using a pump, eliminating the need for high-pressure after-coolers and allowing for temperature adjustment using a cooling medium, thereby reducing power consumption and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If gas is cooled and liquefied at pressure less than critical pressure, then liquefaction can be achieved, but the amount of cold energy required significantly increases and lower temperature is required
Solution Approach 1:
The invention changes the pressure parameter during cooling from below critical pressure to at or above critical pressure. By maintaining pressure at or above the critical pressure during the cooling process, the gas can be liquefied at a higher temperature with significantly reduced cold energy requirements, resolving the contradiction between liquefaction temperature and cold energy consumption
Solution Approach 2:
The invention applies preliminary compression to raise the gas pressure to at or above the critical pressure before the cooling process begins. This preliminary action of pressurization prepares the gas in a state where subsequent cooling requires much less cold energy and can occur at higher temperatures, avoiding the need for extensive pre-cooling
2Stress or pressure
If compressor is used to boost gas to target pressure equal to or greater than critical pressure, then high pressure is achieved, but multiple high-pressure seals or multiple compressor casings are required
Solution Approach 1:
The invention introduces an intermediate cooling stage as a mediator between compression and final pressurization. The gas is compressed to an intermediate pressure, cooled to a liquid state, and then pumped to the final high pressure. This intermediary cooling step transforms the gas into a liquid that is easier and more cost-effective to pressurize, avoiding the need for complex high-pressure compressor designs
Solution Approach 2:
The invention segments the pressure boosting process into two distinct stages: first compression to intermediate pressure, then pumping from liquid state to final high pressure. This segmentation allows each component to operate in its optimal pressure range, with the compressor handling only intermediate pressure and the pump handling the final high pressure, thereby reducing overall system complexity
3Temperature
If after-cooler with super-high pressure and large capacity is used, then target temperature and pressure are achieved, but operation efficiency and reliability of the entire boosting system decrease
Solution Approach 1:
The invention changes the pressure parameter during cooling from super-high pressure to at or above critical pressure (but not necessarily super-high). By performing cooling at this optimized pressure range, the system achieves the target temperature with a smaller, more reliable cooling device, eliminating the need for large-capacity super-high pressure after-coolers that reduce system reliability
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 configuration reduces power consumption, lowers the amount of cold energy required for liquefaction, and allows for precise adjustment of target pressure and temperature without the need for expensive equipment, enhancing the overall operation efficiency and reliability of the system.
Implementation Method 1
a compression portion (2) which compresses the target gas to an intermediate pressure which is equal to or greater than the critical pressure and is less than the target pressure to generate an intermediate supercritical fluid
Implementation Method 2
a cooling portion (4) which cools the intermediate supercritical fluid generated by the compression portion (2) to a temperature near to a critical temperature to generate an intermediate supercritical pressure liquid
Implementation Method 3
a pump portion (3) which boosts the intermediate supercritical pressure liquid generated by the cooling portion (4) to a pressure which is equal to or greater than the target pressure
Implementation Method 4
a cooling temperature adjusting portion (9) which adjusts a temperature of the intermediate supercritical pressure liquid generated by the cooling portion (4) using a cooling medium in an upstream side of the pump portion (3)
Data Source
AI summary
A boosting system which boosts a target gas to a pressure which is equal to or greater than a target pressure higher than a critical pressure includes a compression portion which compresses the target gas to an intermediate pressure which is equal to or greater than the critical pressure and is less than the target pressure to generate an intermediate supercritical fluid, a cooling portion which cools the intermediate supercritical fluid generated by the compression portion to a temperature near to a critical temperature to generate an intermediate supercritical pressure liquid, a pump portion which boosts the intermediate supercritical pressure liquid generated by the cooling portion to a pressure which is equal to or greater than the target pressure, and a cooling temperature adjusting portion which adjusts a temperature of the intermediate supercritical pressure liquid generated by the cooling portion in an upstream side of a pump.