Solid Particle Heat Transfer Medium for Solar Thermochemical Reactors
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Solution Overview
Problem
Current solar-driven thermochemical reactors face inefficiencies due to temperature differences between reduction and cleavage steps, limited heat recovery, and the need for stable heat transfer media that can handle high temperatures, leading to suboptimal overall process efficiency and scalability.
Innovation Solution
A process utilizing a solid reactant that undergoes reduction at a high temperature and oxidation at a lower temperature, with heat transfer mediated by solid spherical particles in heat exchangers, allowing for efficient heat recovery and decoupling of reaction steps, enabling continuous operation and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a liquid heat transfer medium is used in the receiver, then heat transfer efficiency is improved, but the system complexity increases due to requiring separate solid absorption medium and fluid heat exchanger components
Solution Approach 1:
The patent combines the heat absorption and heat transfer functions into a single integrated system. Solid particles serve dual purposes: they absorb solar radiation in the receiver and simultaneously transfer heat through their movement, eliminating the need for separate liquid heat transfer media and solid absorption media, thus reducing system complexity while maintaining heat transfer efficiency
Solution Approach 2:
The solid particles are designed to perform multiple functions within the system: they act as both the solar energy absorption medium and the heat transfer medium. This multi-functionality reduces the number of separate components needed in the system, addressing the complexity issue while maintaining effective heat transfer
2Productivity
If the temperature difference between reduction and oxidation steps is increased, then reaction efficiency is improved, but the requirements on material stability and heat management become more stringent
Solution Approach 1:
The patent employs dynamic temperature management where the oxidation step is performed at elevated temperatures (800-1500°C) to maintain material stability and enable rapid heat transfer. The system dynamically adjusts operating conditions to balance reaction efficiency with material durability, allowing higher temperature differences while maintaining reliability through careful selection of thermally stable materials and optimized residence times
Solution Approach 2:
The system optimizes the temperature parameters for each reaction step to achieve the desired efficiency while maintaining material stability. By carefully controlling the temperature range and duration at each stage, the patent maximizes the temperature difference for improved reaction efficiency while staying within the stability limits of the materials used
3Device complexity
If solid particles are used as heat transfer medium, then system simplicity is improved, but heat transfer efficiency may be reduced compared to liquid media
Solution Approach 1:
The patent utilizes the kinetic energy and movement of solid particles to enhance heat transfer. The particles are actively circulated and agitated within the system, creating dynamic heat transfer conditions that compensate for the generally lower thermal conductivity of solids compared to liquids. This mechanical movement ensures efficient heat distribution throughout the system
Solution Approach 2:
The system employs fluid dynamics principles to transport and circulate the solid particles through the receiver and heat exchanger components. By using gas or liquid flows to carry the particles, the system achieves efficient heat transfer comparable to liquid-only systems while maintaining the simplicity benefits of using solid particles as the primary heat transfer medium
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 achieves high heat recovery rates and efficient operation by optimizing temperature management and heat transfer, enhancing the overall efficiency and scalability of the thermochemical process.
Implementation Method 1
wherein sensitive heat of the solid reactant is transferred to a heat transfer medium at the temperature T1 in a first heat exchanger (3) after the reaction is complete in said first reaction chamber (1); and said heat taken up by the heat transfer medium in the first heat exchanger (3) is transferred again to said solid reactant at the temperature T2 in a second heat exchanger (4)
Implementation Method 2
a solid reactant is reduced in a first reaction chamber (1) with uptake of heat at a first temperature T1
Implementation Method 3
said solid reactant is subsequently oxidized in a second reaction chamber (2) with release of heat at a second temperature T2
Data Source
AI summary
The present invention relates to a process for performing a chemical reaction consisting of at least two sequential reversible steps characterized by being performed in a cycle, and to a reactor for performing such process.