Oxygen Selective Adsorbent for Lower Vacuum Desorption
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Solution Overview
Problem
Current oxygen separation technologies, such as cryogenic separation and adsorption techniques, are inefficient and costly, particularly for pure oxygen combustion in power generation, due to high energy consumption and large equipment requirements, necessitating a more cost-effective and efficient method for oxygen production.
Innovation Solution
Development of an oxygen selective adsorbent comprising BaxSr(1−x)Mgy(CO3) or BaxSr(1−x)CO3 particles, which are calcined at high temperatures, allowing for lower vacuum desorption and increased thermal stability, thereby reducing the energy needed for oxygen recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional adsorption separation techniques (PSA, VSA) are used to separate oxygen from air, then oxygen can be produced, but large-capacity vacuum pumps or compressors are required which are difficult to develop and commercialize
Solution Approach 1:
Instead of adsorbing nitrogen (the majority component) to produce oxygen, this invention inverts the approach by selectively adsorbing oxygen (the minority component) using metal oxide adsorbents. This allows oxygen production with much smaller adsorbent amounts and eliminates the need for large-capacity vacuum pumps or compressors, making the system easier to commercialize.
Solution Approach 2:
The invention changes the operating parameters by using adsorbents that function at lower pressures and temperatures compared to conventional PSA/VSA systems. The metal oxide adsorbents enable oxygen separation under milder conditions, reducing the complexity of required equipment.
2Productivity
If nitrogen selective adsorbent is used to separate oxygen from air, then oxygen can be produced, but the adsorbent amount required is increased since nitrogen accounts for 80% in air
Solution Approach 1:
Rather than removing 80% of nitrogen to obtain 20% oxygen, this invention directly targets and adsorbs the 20% oxygen component. This inverted approach reduces the adsorbent quantity required to one-fourth of conventional nitrogen-selective systems, as confirmed in the background section.
3Reliability
If cryogenic separation process is used for oxygen production, then high concentration oxygen can be supplied, but 17% of generated electricity is consumed resulting in decreased generation efficiency
Solution Approach 1:
The invention replaces the energy-intensive cryogenic mechanical separation process with a chemical adsorption process using metal oxide materials. This substitution eliminates the need for complex cryogenic equipment and significantly reduces electricity consumption while maintaining high oxygen concentration output.
Solution Approach 2:
The invention changes the operating parameters from extreme cold temperatures required by cryogenic separation to moderate temperatures suitable for metal oxide adsorption. This parameter change dramatically reduces energy consumption while achieving the same oxygen concentration goal.
4Productivity
If barium oxide is used for oxygen adsorption via oxidation reaction, then oxygen can be adsorbed and discharged, but relatively high vacuum operating condition is required on desorption
Solution Approach 1:
The invention uses composite metal oxide materials (such as BaMg(CO3)2 and other perovskite structures) that combine the oxygen adsorption capability of barium-based materials with enhanced properties. These composite materials achieve high oxygen sorption capacity while requiring lower vacuum conditions for desorption compared to pure barium oxide.
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 adsorbent achieves high oxygen sorption capacity and thermal stability, enabling oxygen recovery under lower vacuum conditions, thus enhancing the efficiency and reducing the costs associated with oxygen production in power generation processes.
Implementation Method 1
an oxygen selective adsorbent capable of producing high purity oxygen by adsorbing oxygen from air in a rapid adsorption rate
Implementation Method 2
calcining them at high temperature, allowing for lower vacuum desorption and increased thermal stability
Data Source
AI summary
The present invention provides an oxygen selective adsorbent containing oxides of BaxSr(1−x)Mgy(CO3)(1+y) or BaxSr(1−x)CO3 particles, increasing transition oxygen partial pressure, and representing high thermal stability and excellent oxygen sorption cavity, by adding another metal such as Sr to Ba which is active element for oxygen adsorption, so as to be capable of desorbing oxygen under lower vacuum even at the same operating temperature than the existing oxygen selective adsorbent; and a preparation method thereof.