Variable NOx Removal via Segmented Gas Stream Ozone Oxidation
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Solution Overview
Problem
Existing ozone-based nitrogen oxide (NOx) removal technologies face challenges in achieving variable NOx removal fractions efficiently, particularly in scenarios with continuously varying NOx levels, due to space limitations and inefficiencies in ozone mixing and residence time, leading to excessive ozone usage and NO2 emission.
Innovation Solution
A flexible ozone-based oxidation system that separates the process gas stream into variable fractions using partitions, baffles, or dampers, allowing ozone to be fed into specific streams for oxidation, followed by scrubbing, optimizing ozone usage and maintaining NO2 levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ozone is fed into the entire process gas stream to achieve high levels of nitrogen oxide removal (90%), then nitrogen oxide removal efficiency is improved, but ozone usage becomes excessive and economically inefficient
Solution Approach 1:
The process gas stream is divided into multiple separate streams using partitions, baffles, or dampers. Ozone is selectively fed into only those streams that require nitrogen oxide removal, rather than treating the entire gas stream. This segmentation allows precise control of ozone dosage to match actual removal needs, achieving high removal efficiency in targeted streams while avoiding excessive ozone usage in streams with lower contamination or different requirements.
2Device complexity
If fixed partition configurations are used to separate gas streams, then ozone distribution control is simplified, but adaptability to varying nitrogen oxide levels and operational conditions is reduced
Solution Approach 1:
The system incorporates adjustable and movable partitions, baffles, and dampers that can be dynamically reconfigured based on varying nitrogen oxide levels and operational conditions. This dynamic capability allows the gas stream segmentation to adapt in real-time to changing contamination patterns, ensuring ozone is always directed to the appropriate streams. The movable components maintain relatively simple device complexity while providing high adaptability to different operating scenarios.
3Quantity of substance
If ozone is fed into separated gas streams, then ozone usage is optimized, but the system complexity increases due to multiple feeding points and stream management
Solution Approach 1:
The system segments the gas stream into multiple treatable streams using physical partitions and baffles, allowing selective ozone injection into specific streams. This segmentation enables precise ozone dosing where needed, improving overall ozone usage efficiency by avoiding treatment of already clean or low-priority streams.
Solution Approach 2:
Dampers are introduced as intermediary control elements between the ozone source and the separated gas streams. These dampers regulate and modulate ozone flow distribution to different streams based on real-time contamination levels, simplifying the management of multiple feeding points while maintaining optimized ozone usage across the system.
4Object-affected harmful factors
If high levels of nitrogen oxide removal are achieved, then emissions compliance is improved, but the cost of ozone consumption increases significantly
Solution Approach 1:
The system applies different treatment qualities to different gas streams based on their specific contamination characteristics. Streams with high nitrogen oxide levels receive full ozone treatment for maximum removal, while streams with lower contamination receive reduced or no treatment. This local quality approach ensures emissions compliance is achieved in a cost-effective manner by concentrating ozone resources where they are most needed rather than uniformly treating all streams at high intensity.
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 system effectively removes a variable partial fraction of NOx with close to stoichiometric ozone usage, reducing NO2 emission and ozone slip, while accommodating varying NOx levels without the need for fixed partition configurations, thus being cost-effective and adaptable to changing operational conditions.
Implementation Method 1
Ozone is fed into contact with at least one of the separated process gas streams to oxidize the contaminants in the gas stream
Data Source
AI summary
A method for the partial removal of contaminants such as nitrogen oxides from a process gas stream is described. The process gas stream is separated into at least two process gas streams by means of a partition, baffle, damper or other device. Ozone is fed into contact with at least one of the separated process gas streams to oxidize the contaminants therein and the at least one of the process gas streams contacted by ozone is fed to a scrubber for removal of the oxidized contaminants from the gas streams. The separation is proportional to the percentage removal of contaminants desired.