Regenerative Thermal Oxidizer Segmentation for Undiluted Waste Gas
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Solution Overview
Problem
Existing regenerative thermal oxidizers (RTOs) are physically large, expensive, and require significant energy consumption due to the need for air dilution of waste gases, which also leads to increased carbon dioxide and nitrogen oxide emissions.
Innovation Solution
A regenerative thermal oxidizer design that allows for undiluted introduction of waste gas and separate introduction of oxygen, optimizing gas flow through beds to enhance preheating efficiency and reduce the overall gas volume, thereby minimizing size, cost, and energy consumption while reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If waste gas is diluted with air prior to entering the RTO, then safety requirements are met (lower explosion limit maintained), but the physical size of the RTO increases
Solution Approach 1:
The waste gas stream is divided into two separate streams: one that is diluted with air and introduced downstream of the bed, and another undiluted stream that is introduced directly into the reaction chamber. This segmentation allows the system to meet safety requirements for the diluted portion while minimizing the volume increase from undiluted waste gas oxidation.
Solution Approach 2:
The invention changes the spatial arrangement by introducing waste gas at two different locations: downstream of the bed (for diluted gas) and directly into the reaction chamber (for undiluted gas). This dimensional change in gas introduction positions enables efficient use of space while maintaining safety.
2Reliability
If waste gas is diluted with air prior to entering the RTO, then safety requirements are met, but operating cost increases
Solution Approach 1:
By segmenting the waste gas treatment into diluted and undiluted portions introduced at different locations, the system reduces the total volume of gas requiring treatment compared to complete dilution, thereby lowering operating costs while maintaining safety.
Solution Approach 2:
The undiluted waste gas introduced directly into the reaction chamber contributes to the combustion process and heat generation, allowing the system to partially self-sustain the oxidation process without requiring additional energy input that would be necessary if all waste gas were diluted.
3Reliability
If waste gas is diluted with air prior to entering the RTO, then safety requirements are met, but energy consumption increases
Solution Approach 1:
Segmenting the waste gas stream allows the undiluted portion to be directly combusted in the reaction chamber, providing energy input that reduces the overall energy consumption of the system compared to treating all waste gas through the energy-intensive bed preheating process.
Solution Approach 2:
The invention converts the potentially harmful undiluted waste gas into a beneficial fuel source by introducing it directly into the reaction chamber where it combusts and provides heat, thereby reducing the energy consumption that would otherwise be required to maintain reaction temperatures.
4Reliability
If waste gas is diluted with air prior to entering the RTO, then safety requirements are met, but carbon dioxide and nitrogen oxide emissions increase
Solution Approach 1:
By segmenting the waste gas treatment, the system minimizes the volume of gas that undergoes complete combustion with added air, thereby reducing the formation of carbon dioxide and nitrogen oxide emissions while still maintaining safety through the diluted stream.
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 design results in a smaller, more cost-effective RTO with reduced energy consumption and lower emissions, achieving efficient oxidation of pollutants at elevated temperatures without the need for extensive air dilution.
Implementation Method 1
Waste gas is introduced into the RTO to flow through one of the beds to preheat the waste gas
Implementation Method 2
the produced flue gas flows through the other one of the beds and transfers thermal energy to the bed
Implementation Method 3
In the reaction room, VOCs are oxidized and the produced flue gas
Implementation Method 4
RTOs are typically used for oxidation (combustion) of volatile organic compounds (VOCs)
Data Source
Figure 1
Figure 2
Figure 3a~4
AI summary
The present disclosure relates to a regenerative thermal oxidizer comprising at least a first transfer chamber and at least a second transfer chamber, wherein the first transfer chamber comprises a first bed and the second transfer chamber comprises a second bed; at least one reaction chamber in fluid flow communication with the first transfer chamber and with the second transfer chamber; and one or more first waste gas inlet for introducing at least a first portion of waste gas into the regenerative thermal oxidizer positioned between at least a portion of the first bed and at least a portion of the reaction chamber or positioned between at least a portion of the second bed and at least a portion of the reaction chamber.