Ozone Recovery Adsorption System Flow Control
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Solution Overview
Problem
The OZORA™ oxygen recovery system faces challenges in regulating and controlling the flow of gas streams during mode transitions, leading to fluctuations in ozone product flow rates and purity, particularly due to uncontrolled bed-to-bed gas transfer and rinse steps.
Innovation Solution
A method involving a four-bed adsorption process with a globe valve and programmable logic controller to adjust and regulate the flow rate of clean dry air, ensuring consistent ozone product flow by matching incoming and outgoing flow rates and concentrations, and using pressure regulators to maintain stable CDA flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uncontrolled bed-to-bed gas transfer is used in the OZORA system, then the system structure is simpler, but the ozone product flow rate and purity fluctuate during mode transitions
Solution Approach 1:
The patent applies dynamics by making the gas flow paths adjustable and controllable through valves and a programmable logic controller. The system transitions from a static, uncontrolled configuration to a dynamic one where flow rates and path selections can be changed based on operational mode requirements, thereby stabilizing ozone product flow during transitions.
Solution Approach 2:
The patent implements feedback control by using a programmable logic controller to monitor and adjust the gas flow paths and rates. The controller receives information about system state and automatically adjusts valve positions and flow rates to maintain stable ozone product output, creating a closed-loop control system that responds to actual operating conditions.
2Ease of operation
If uncontrolled rinse step is used, then the operation is simpler, but the purity of recycled oxygen decreases due to residual nitrogen
Solution Approach 1:
The programmable logic controller monitors the rinse step process and adjusts the flow rate of clean dry air based on detected conditions. This feedback mechanism ensures that the rinse step is performed with sufficient duration and intensity to remove residual nitrogen while preventing over-rinsing that would waste energy or reduce system efficiency.
Solution Approach 2:
The patent changes the flow rate parameter of clean dry air during the rinse step from an uncontrolled state to a regulated state. By adjusting this parameter through the control system, the rinse effectiveness is optimized to achieve the required oxygen purity while maintaining ease of operation through automated control.
3Ease of operation
If flow rate of clean dry air is not regulated, then the device operation is simpler, but the proportioning of gas flow paths becomes uncontrolled
Solution Approach 1:
The control system continuously monitors the actual flow rate of clean dry air and compares it to the desired setpoint. Based on this feedback, the system automatically adjusts the valve position to maintain the correct proportioning of gas flow paths, ensuring precise control while keeping the operation simple through automation.
Solution Approach 2:
The system performs self-adjustment of the clean dry air flow rate through the programmable logic controller and control valve. The system monitors its own operating conditions and automatically corrects deviations in flow proportioning without requiring manual intervention, thereby maintaining precision while simplifying operation.
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 approach stabilizes ozone product flow rates and purity by independently controlling gas flow paths, reducing perturbations and maintaining mass balance, thereby enhancing the efficiency and reliability of ozone recovery and production.
Implementation Method 1
The adsorbent is selected to preferentially adsorb ozone, while allowing oxygen to pass through the adsorbent
Implementation Method 2
Ozone is typically generated from oxygen utilizing a corona discharge
Implementation Method 3
Ozone is an unstable compound that decomposes to oxygen under ambient conditions
Data Source
AI summary
A method for the continuous production of ozone and recovery of oxygen in a purge cycle adsorption process having four adsorbent beds. The method has the steps of feeding a mixture of ozone and oxygen to a first and second adsorbent bed wherein the first and the second adsorbent bed adsorb ozone and allow oxygen to pass through; recovering the oxygen from the first bed; feeding the oxygen from the second bed to a fourth adsorbent bed, wherein ozone is desorbed from the fourth bed; feeding clean dry air through a valve to the third adsorbent bed, and measuring the flow rate of the clean dry air through the valve, comparing this flow rate to a pre-calculated value and adjusting the flow rate of the clean dry air to equal the pre-calculated value; desorbing ozone from the third bed; and recovering ozone from the third bed and the fourth bed.