Moving Bed TCES Reactor for Efficient CaO Pellet Charging and Discharge
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Solution Overview
Problem
Existing chemical reactors for thermochemical energy storage systems are complicated, expensive, and lack efficient heat and mass transfer, leading to suboptimal performance and high material degradation.
Innovation Solution
The use of high-strength CaO/Ca(OH)2 pellets in a moving bed reactor system, optimized for thermochemical energy storage, with controlled heating and fluid supply to enhance roundtrip efficiency, and the reuse of byproducts to improve overall system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chemical reactors are used for thermochemical energy storage, then the system can perform chemical reactions, but the reactors become complicated and expensive with poor heat and mass transfer
Solution Approach 1:
The reactor is divided into multiple zones (charging zone, discharge zone, and transition zone) with different functional characteristics. Each zone is optimized for specific conditions - the charging zone handles dehydration at high temperature, the discharge zone handles hydration at lower temperature, and the transition zone facilitates smooth material flow between zones. This segmentation resolves the contradiction by enabling high roundtrip efficiency through specialized zones while keeping the overall structure manageable through modular design.
Solution Approach 2:
The system employs dynamic control of material flow rates, temperature profiles, and fluid circulation to optimize performance at different operating stages. The moving bed configuration allows continuous adjustment of residence times and heat transfer conditions, enabling the reactor to adapt to varying energy storage and discharge requirements while maintaining high efficiency and reducing complexity through automated control.
2Reliability
If conventional chemical reactors are used for thermochemical energy storage, then the system can perform chemical reactions, but the reactors become expensive
Solution Approach 1:
The system optimizes operating parameters including temperature profiles (charging at high temperature, discharge at lower temperature), pressure conditions, and material flow rates to maximize roundtrip efficiency. By carefully controlling these parameters, the reactor achieves high efficiency without requiring expensive specialized materials or complex construction, thereby reducing manufacturing costs while maintaining reliability.
Solution Approach 2:
The reactor design enables self-regulating operation where the exothermic hydration reaction in the discharge zone provides its own heat, and the endothermic dehydration reaction in the charging zone absorbs heat from the environment. This self-service characteristic reduces the need for expensive external heating and cooling systems, lowering manufacturing costs while maintaining high roundtrip efficiency.
3Reliability
If conventional chemical reactors are used for thermochemical energy storage, then the system can perform chemical reactions, but heat and mass transfer are inefficient
Solution Approach 1:
The reactor is segmented into distinct zones with optimized heat and mass transfer characteristics. The charging zone features high temperature conditions and controlled air flow for efficient dehydration, while the discharge zone maintains lower temperature with optimized steam contact for efficient hydration. This segmentation enables high reaction rates in each zone while maintaining overall system reliability through controlled transitions.
Solution Approach 2:
The system employs pneumatic and hydraulic principles to enhance heat and mass transfer through controlled fluid flow. Air and steam are circulated through the reactor zones with optimized flow patterns that maximize contact between reactants and heat transfer surfaces. This approach significantly improves reaction rates and heat transfer efficiency while maintaining system reliability through controlled fluid dynamics.
4Use of energy by moving object
If high temperature heating is applied to dehydrate material, then energy storage is achieved, but material degradation occurs
Solution Approach 1:
The system dynamically controls the charging zone temperature to maintain optimal conditions for dehydration while preventing material degradation. Temperature profiles are adjusted in real-time based on material state and reaction progress, enabling high energy storage capacity through efficient dehydration while preserving material stability through controlled thermal conditions that avoid excessive temperature spikes.
Solution Approach 2:
The reactor operates continuously with material flowing through the charging zone at controlled temperatures, maintaining steady-state conditions that optimize both energy storage and material stability. The continuous operation allows for uniform heat distribution and prevents localized overheating that could cause degradation, while maintaining high dehydration efficiency for energy storage.
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
Achieves high roundtrip efficiency of 95% or greater, enabling effective energy storage and discharge with reduced material degradation and improved process efficiency in industrial applications.
Implementation Method 1
heating a hydrated or carbonated or oxidized or hydrogenated material (e.g., metal hydroxide, metal carbonate, metal oxide or metal hydride) to a high temperature, e.g., upwards of 120° C. to dehydrate or decarbonate or reduce or dehydrogenate, respectively, the material
Implementation Method 2
supplying gaseous water, i.e., water vapor in form of steam or humidified air, to hydrate the dehydrated material
Implementation Method 3
moving bed reactor system, optimized for thermochemical energy storage
Implementation Method 4
efficient heat and mass transfer required for an energy storage system
Implementation Method 5
reactions involve a mixture of a gas (e.g., air) and water vapor in the form of steam
Implementation Method 6
some disclosed principles can prevent or reduce condensation of water vapor compared to previously disclosed systems
Data Source
AI summary
A reactor for charging and discharging a thermochemical energy storage (TCES) material has an inlet for receiving a pelletized TCES material and an outlet for exhausting the pelletized TCES material. A selectively operable heater is configured to heat the material in a charging mode. A blower is configured to urge a stream of air over the material in the charging mode and to urge a stream of another fluid over the material in a discharging mode. A reaction chamber houses the selectively operable heater. The reaction chamber is so configured to receive the material within the reaction chamber from the inlet and configured to exhaust the material from the reaction chamber to the outlet. The reaction chamber is further configured to direct the stream of stream of air over the material in the charging mode and to direct the stream of another fluid over the material in the discharging mode.