Multi-Module Thermochemical Heat Storage Using Staged Desorption

The patent changes the temperature parameter by using multi-stage desorption processes with progressively lower temperature stages. This allows the system to achieve high storage density with hygroscopic salts while avoiding the temperature-induced instability issues by operating below critical temperature thresholds where decomposition and other unwanted reactions occur.

The patent segments the single high-temperature desorption process into multiple lower-temperature stages. By dividing the desorption process into sequential stages operating at different temperature levels, the system achieves complete water removal and high storage density while maintaining material stability through controlled, gradual dehydration that prevents thermal shock and chemical degradation.

The patent introduces dynamic, adjustable temperature control through multiple heatable stages that can operate at different temperature levels. This dynamic system allows optimization of storage density by selecting appropriate temperature stages while maintaining operational simplicity through automated control sequences that manage the complexity of multi-stage operation.

The system uses the heat output from exothermic hydration reactions in later stages to provide the heating energy needed for earlier desorption stages. This self-service approach eliminates the need for external high-temperature heat sources, maintaining system simplicity while achieving high storage density through internal energy recycling across multiple stages.

The patent implements periodic, multi-stage desorption cycles where each stage operates at a controlled temperature level for a specific duration. This periodic action with progressive temperature staging allows sufficient heat recovery at each stage while limiting exposure time at any given temperature, thereby reducing overall heat loss without subjecting materials to prolonged high-temperature conditions that would cause decomposition.

The system maintains continuous useful action through cascading heat transfer across multiple stages, where heat released in later hydration stages continuously supplies energy to earlier desorption stages. This continuous internal heat recycling minimizes external heat loss while maintaining all stages within stable temperature ranges, avoiding material degradation.