Solar thermochemical processing system and method
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Solution Overview
Problem
Conventional concentrated solar power (CSP) systems have a limited capacity factor due to their reliance on direct sunlight for electricity generation, making them unsuitable for baseload power and requiring innovative methods to store energy effectively.
Innovation Solution
A solar thermochemical processing system that utilizes high-temperature heat from solar concentrators to drive endothermic and exothermic reactions, converting solar energy into chemical energy stored in products like methanol and syngas, which can be used for electricity generation and fuel production, even when sunlight is not available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CSP systems use traditional heat engines (Rankine, Brayton, Stirling cycles) to generate electricity, then electricity generation is achieved when direct sunlight is available, but the capacity factor is limited to 20-25% and baseload power generation is not possible
Solution Approach 1:
The system performs preliminary action by using solar energy to drive endothermic reactions that store energy in chemical bonds during the day. The chemical products (such as syngas, methanol, or hydrocarbons) are then used to generate electricity via heat engines or fuel cells during periods without sunlight, enabling continuous operation and baseload power generation.
Solution Approach 2:
The invention changes the energy storage parameter from sensible/latent heat storage to chemical energy storage through thermochemical reactions. This parameter change allows energy to be stored in a form that can be converted to electricity on demand, thereby increasing capacity factor and enabling continuous operation.
2Loss of energy
If solar energy is stored as sensible or latent heat, then energy storage is achieved, but transport and storage requirements become complex and energy degradation occurs over longer term storage
Solution Approach 1:
The system changes the energy storage parameter from thermal energy (sensible/latent heat) to chemical energy stored in molecular bonds. Chemical products such as syngas, methanol, and hydrocarbons can be stored at ambient conditions without significant energy degradation, simplifying storage infrastructure and enabling long-term retention.
Solution Approach 2:
The invention utilizes phase transitions and chemical state changes to store energy. By converting solar thermal energy into chemical compounds through endothermic reactions, the energy is stored in a stable chemical phase that can be transported and stored without the complexities associated with high-temperature thermal storage systems.
3Use of energy by moving object
If fossil fuels or biomass are used for baseload power generation, then continuous electricity generation is achieved, but solar energy utilization efficiency is reduced
Solution Approach 1:
The system achieves multi-functionality by combining solar-driven thermochemical reactions with conventional heat engines or fuel cells. The same infrastructure can utilize solar energy at high conversion efficiencies when available and switch to fossil fuels or biomass for baseload operation, thereby achieving both high solar utilization and continuous power generation.
Solution Approach 2:
The invention introduces chemical intermediaries (syngas, methanol, hydrocarbons) that serve as energy carriers between solar energy input and electricity generation. These intermediaries allow the system to decouple solar energy capture from electricity generation, enabling high solar-to-chemical conversion efficiency while maintaining continuous power supply through subsequent combustion or fuel cell conversion.
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 system enhances the capacity factor of CSP systems by enabling baseload power generation and efficient storage of solar energy as chemical energy, reducing carbon dioxide emissions and increasing the utilization of feedstock carbon, while providing a high solar-to-chemical energy conversion efficiency.
Implementation Method 1
high-temperature heat, available from solar concentrators
Implementation Method 2
using heat from the solar energy to drive the first unit operation
Implementation Method 3
a first unit operation for receiving concentrated solar energy, using heat from the solar energy to drive the first unit operation
Implementation Method 4
a third unit operation for receiving heat from the second unit operation to produce a portion of the first set of reactants
Data Source
AI summary
A solar thermochemical processing system is disclosed. The system includes a first unit operation for receiving concentrated solar energy. Heat from the solar energy is used to drive the first unit operation. The first unit operation also receives a first set of reactants and produces a first set of products. A second unit operation receives the first set of products from the first unit operation and produces a second set of products. A third unit operation receives heat from the second unit operation to produce a portion of the first set of reactants.