Multi-Compartment Reactor for VOC Removal
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Solution Overview
Problem
Current methods for removing organic compounds from gas flows, such as volatile organic compounds (VOCs) and bacteria, require high temperatures and complex equipment, leading to energy inefficiencies and large-scale infrastructure needs, especially when dealing with low concentrations of contaminants.
Innovation Solution
A process utilizing a reactor with two compartments filled with porous sintered metal material, where the gas flow is heated through one compartment and then passed over a catalytic oxidation catalyst in the other, allowing for efficient heat transfer and catalytic combustion at lower temperatures, potentially aided by additional combustible gas or electric heating, and using a catalytically active metal gauze for enhanced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal oxidation at high temperature (800°C or more) is used to remove organic compounds from gas flows, then complete oxidation to carbon dioxide and water is achieved, but the energy consumption increases significantly and the equipment size becomes large
Solution Approach 1:
The gas flow is preheated by heat exchange with the hot treated gas flow before entering the oxidation zone. This preliminary heating action reduces the energy required to reach oxidation temperature, thereby lowering overall energy consumption while maintaining complete oxidation effectiveness.
Solution Approach 2:
The oxidation process is shifted from high-temperature thermal oxidation (800°C+) to lower-temperature catalytic oxidation (200°C or more). This parameter change in temperature, enabled by catalysts such as platinum or palladium oxide, maintains oxidation completeness while significantly reducing energy consumption.
2Use of energy by moving object
If reverse flow technique with ceramic beds is used to store thermal energy, then fuel consumption is reduced, but the equipment complexity and size increase due to multiple beds and control equipment
Solution Approach 1:
The heating and cooling functions are combined in a single continuous flow path through the catalyst bed. The hot treated gas flows through the catalyst bed and directly preheats the incoming gas, merging the thermal energy storage and transfer functions into one integrated system, thereby reducing equipment complexity while maintaining energy efficiency.
Solution Approach 2:
The system uses the thermal energy from the treated gas flow itself to preheat the incoming gas, making the system self-sufficient for heat requirements. This self-service approach eliminates the need for external thermal energy storage beds and complex control systems, reducing equipment complexity while maintaining low fuel consumption.
3Use of energy by moving object
If catalyst bed is used to oxidize compounds at lower temperature (200°C or more), then energy consumption decreases, but the heat of combustion of impurities is insufficient to reach the required temperature
Solution Approach 1:
A heat exchange intermediary (the catalyst bed itself) transfers thermal energy from the hot treated gas flow to the incoming gas flow. This intermediary mechanism enables the system to reach the required catalytic oxidation temperature using the heat from the combustion process itself, overcoming the insufficient heat of combustion of impurities.
Solution Approach 2:
The heat exchange process occurs continuously as gas flows through the catalyst bed, maintaining a continuous supply of thermal energy to sustain the catalytic oxidation reaction. This continuous action ensures that the required temperature is maintained throughout the process without interruption, enabling sustained low-temperature oxidation.
4Temperature
If additional fuel gas is added to reach catalytic oxidation temperature, then the required temperature is achieved, but the process costs increase
Solution Approach 1:
The system uses the thermal energy from the treated gas flow to preheat the incoming gas to the required catalytic oxidation temperature. This self-service heating approach eliminates or minimizes the need for additional fuel gas, thereby reducing process costs while maintaining the necessary oxidation temperature.
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 reduces energy requirements and equipment size, allowing for effective removal of organic compounds at lower temperatures, minimizing fuel usage and operational costs, while maintaining high purification efficiency even with low concentrations of contaminants.
Implementation Method 1
the gas flow is heated by heat exchange with the second compartment
Implementation Method 2
both the first and the second compartment are filled with porous sintered metal material, which is in heat exchanging relationship to the joint wall
Implementation Method 3
passing the heated gas flow to the second compartment, further heating the gas flow entering the second compartment either by adding additional combustible gas or electric heating, and passing the heated gas through the second compartment over a catalytic oxidation catalyst to combust the organic compounds
Implementation Method 4
to combust the organic compounds
Implementation Method 5
both the first and the second compartment are filled with porous sintered metal material
Data Source
AI summary
The present invention is directed to a process and a reactor for removing organic compounds from gas flows, in which process the said gas flow is passed through a first compartment of a multi-compartment reactor, which reactor comprises at least one first compartment and at least one second compartment, which first and second compartments are in heat exchanging relationship with each other through a joint, gas-tight wall, and in which first compartment the gas flow is heated by heat exchange with the said second compartment, passing the heated gas flow to the second compartment, further heating the gas flow entering the second compartment either by adding additional combustible gas or electric heating, and passing the heated gas through the second compartment over a catalytic oxidation catalyst to combust the organic compounds, whereby both the first and the second compartment are filled with porous sintered metal material, which is in heat exchanging relationship to the said joint wall, whereby the metal material in the second compartment is provided with the said oxidation catalyst.