Dynamic Catalytic Reactor Zoning for Variable Hydrogen Feed
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Solution Overview
Problem
Catalytic reactors for CO2 hydrogenation face challenges in utilizing renewable energy due to its fluctuating nature, requiring large-scale energy storage and high-cost hydrogen storage, leading to increased production costs and inefficiencies.
Innovation Solution
A dynamic catalytic conversion reactor that adjusts its operation based on fluctuating renewable energy sources, eliminating the need for energy storage by using a modular design with separate zones and a heat transfer medium to maintain consistent reactor temperature and hydrogen supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steady-state operation mode is used for catalytic reactors, then consistent reaction performance is achieved, but large-scale energy storage is required to handle fluctuating renewable energy supply
Solution Approach 1:
The reactor system dynamically adjusts its operation mode between steady-state and transient regimes based on real-time hydrogen feed availability. The control system monitors hydrogen supply fluctuations and automatically transitions between operational modes, eliminating the need for large energy storage systems while maintaining reliable reaction performance.
Solution Approach 2:
The system changes operational parameters such as reaction temperature, pressure, and feed flow rates to adapt to varying hydrogen supply conditions. By adjusting these parameters dynamically, the reactor can maintain optimal performance across different operating conditions without requiring extensive energy storage infrastructure.
2Productivity
If green hydrogen is produced from water electrolysis using renewable electricity, then sustainable chemicals and fuels can be produced, but high electricity costs and energy loss from DC to AC conversion occur
Solution Approach 1:
The system maintains continuous operation by utilizing transient hydrogen feeds directly from water electrolysis without interruption. The reactor is designed to handle variable feed rates continuously, eliminating the need for hydrogen storage and avoiding energy losses associated with liquefaction or compression, thereby reducing overall energy costs.
Solution Approach 2:
The reactor acts as an intermediary that receives variable hydrogen feeds from water electrolysis and converts them into stable chemical products. This intermediary function absorbs the variability in hydrogen supply and delivers consistent product output, eliminating the need for expensive hydrogen storage and energy-intensive processing steps.
3Adaptability or versatility
If transient renewable energy is used to drive water electrolysis, then direct utilization of variable power is achieved, but hydrogen storage becomes problematic due to its low density
Solution Approach 1:
The system extracts and utilizes hydrogen directly from the water electrolysis process as it is produced, feeding it continuously into the reactor. By taking out hydrogen immediately upon production and avoiding storage, the system eliminates the problems associated with hydrogen's low density while fully utilizing transient renewable energy for chemical production.
4Temperature
If conventional multitubular reactors are used for CO2 hydrogenation, then exothermic reaction heat is managed, but the reactor cannot quickly adapt to varying hydrogen feed rates
Solution Approach 1:
The reactor incorporates dynamic control mechanisms that allow rapid adjustment of operational parameters in response to varying hydrogen feed rates. The system can quickly transition between different operating modes while maintaining temperature control, enabling it to adapt to transient renewable energy supply fluctuations without compromising reaction temperature management.
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
Enables efficient utilization of renewable energy for CO2 conversion, reducing production costs and maintaining catalyst activity, with the ability to quickly adapt to varying hydrogen feed rates, thus producing sustainable chemicals and fuels competitively with fossil fuels.
Implementation Method 1
a heat transfer medium to maintain consistent reactor temperature
Implementation Method 2
catalytic conversion reactor... converts CO2 and hydrogen into a variety of chemicals and fuels
Data Source
AI summary
A dynamic catalytic conversion reactor having a plurality of operating zones is disclosed that adjusts operation based on incoming hydrogen from a fluctuating renewable energy source. The dynamic reactor is configured to turn on and off supply of feed gas to certain zones based on hydrogen supply, and maintains catalyst activity within all operating and idle zones by applying one of a number of gas flow options through the idle zones. Methods and systems of using the dynamic reactor are also disclosed.