Horizontal Thermocline Thermal Storage for Seismic Stability
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Solution Overview
Problem
Current thermal energy storage systems face challenges such as thermal runaway, inefficiencies in energy delivery, high costs due to large heat exchange surfaces, and the inability to manage variable renewable energy sources effectively, leading to uneven heating and potential equipment failure.
Innovation Solution
A system with vertically oriented thermal storage units, dynamic insulation, and a controller that manages energy input and output based on weather forecasts, ensuring uniform heating and efficient energy delivery, while integrating with steam generators for continuous power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal energy storage systems use conventional heating methods, then energy storage capacity is achieved, but thermal runaway occurs and equipment failure increases
Solution Approach 1:
The thermal storage medium is divided into multiple independently controllable zones or segments. Each segment can be heated and cooled separately, allowing localized temperature control and preventing thermal runaway from propagating through the entire storage system. This segmentation enables safer operation at high energy storage capacities.
Solution Approach 2:
The system incorporates temperature sensors and control mechanisms that continuously monitor thermal conditions and adjust heating/cooling rates in real-time. When temperature approaches critical thresholds, the feedback control automatically reduces or stops heating, preventing thermal runaway and equipment failure while maintaining efficient energy storage.
2Productivity
If large heat exchange surfaces are used, then energy delivery efficiency is improved, but system cost increases
Solution Approach 1:
Instead of using uniformly large heat exchange surfaces throughout the entire storage system, the invention applies enhanced heat exchange surfaces only in specific localized regions where thermal transfer is most critical. This targeted approach maintains high energy delivery efficiency while significantly reducing overall system cost and manufacturing complexity.
Solution Approach 2:
The system utilizes phase-changing materials or phase transition processes to enhance heat transfer efficiency without requiring proportionally large heat exchange surfaces. The phase transition provides intense thermal transfer at relatively small volume, improving energy delivery efficiency while controlling system cost.
3Stability of the object's composition
If thermal energy storage systems operate continuously, then energy delivery consistency is improved, but adaptability to variable renewable energy sources deteriorates
Solution Approach 1:
The thermal energy storage system incorporates dynamic control mechanisms that can adjust operating parameters in real-time based on renewable energy availability and demand conditions. This dynamic operation allows the system to maintain output consistency while adapting to variable renewable energy inputs, resolving the contradiction between continuous operation and flexibility.
Solution Approach 2:
The system changes operational parameters such as heating rates, storage temperature levels, and energy discharge rates based on the availability of variable renewable energy sources and grid demand conditions. This parameter adjustment enables continuous, consistent energy delivery while maintaining adaptability to fluctuating renewable energy inputs.
4Productivity
If heating rates are increased, then energy storage speed is improved, but uniform heating is compromised leading to equipment failure
Solution Approach 1:
The heating system is divided into multiple independently controllable heating zones or elements distributed throughout the storage medium. Each zone can be heated at optimized rates to ensure uniform temperature distribution, while the collective zones achieve high overall energy storage speed. This segmentation prevents localized overheating and maintains heating uniformity.
Solution Approach 2:
The system employs continuous, distributed heating action rather than concentrated intermittent heating. Multiple heating elements operate simultaneously and continuously at lower individual rates, maintaining uniform temperature distribution while achieving high overall heating speed through the cumulative effect of continuous thermal input across the entire storage volume.
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
The system provides efficient, cost-effective thermal energy storage and delivery, reducing equipment failure and maintaining consistent output, even with variable renewable energy sources, and integrates seamlessly with existing industrial infrastructure.
Implementation Method 1
The received electrical energy is converted to heat within thermal storage 14 by resistive heating elements 207
Implementation Method 2
heat transferred principally by radiation emitted both by the heating elements and by hotter portions of the solid storage medium
Implementation Method 3
solid storage medium within storage 14...configured to store thermal energy
Implementation Method 4
a blower 213 drives air or other fluid to thermal storage 205 such that the air is eventually received at a lower portion of each of the arrays 209
Data Source
AI summary
A thermal energy storage (TES) system converts variable renewable electricity (VRE) to continuous heat at over 900° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. The delivered heat which may be used for processes including power generation and cogeneration. The thermal storage medium may constitute refractory material such as brick or concrete configured with radiation cavities and fluid flow channels to provide for rapid radiative charging from VRE and long-term convective discharging. Configurations of the thermal storage medium enable a substantially horizontal thermocline and heat delivery arrangement, which provides seismic stability and facilitates significant expandability of the TES system primarily by increasing the length of the system without adding undue height, contributing to both stability and efficiency of the heat delivery structure.