Microwave Flash Evaporation for Scaling and Corrosion

The patent replaces the traditional mechanical steam heat exchange system with a microwave field system. Instead of using steam heating through heat exchangers, the invention uses microwave radiation to directly heat the liquid feed, eliminating the need for complex multi-effect evaporation apparatus with multiple pumps, heat exchangers, and steam generation systems. This substitution of mechanical/thermal energy transfer with electromagnetic energy transfer simplifies the overall system while maintaining high evaporation efficiency.

The invention changes the fundamental parameter of energy transfer from thermal conduction/convection (steam heating) to electromagnetic radiation (microwave heating). This parameter change allows single-stage evaporation to achieve the same effect as multi-effect systems, reducing device complexity while improving energy efficiency and eliminating the need for multiple evaporation chambers and associated equipment.

The patent substitutes the steam heat exchange system with direct microwave heating. Instead of transferring heat through steam condensation on heat exchanger surfaces (which suffers from heat loss and scaling), the microwave field directly couples with the liquid molecules, causing dielectric heating throughout the bulk liquid. This eliminates the heat transfer interface and associated heat losses, improving energy efficiency while maintaining process stability.

The microwave field acts as an intermediary energy carrier that directly transfers energy to the liquid feed without requiring thermal contact through heat exchangers. This intermediary electromagnetic field enables efficient energy transfer without the heat loss, scaling, and corrosion problems associated with traditional steam heat exchange systems.

The invention changes the energy input method from external thermal heating (steam) to internal dielectric heating (microwave). This allows the liquid to be heated rapidly and uniformly throughout its volume, achieving high evaporation rates at lower bulk temperatures and reduced pressure requirements. The microwave energy is absorbed directly by the liquid molecules, creating internal heat generation that eliminates the need for high-temperature steam and high-pressure operation, thereby reducing corrosion and equipment damage.

The microwave field induces dielectric relaxation and molecular rotation in the liquid, creating intense molecular-level agitation and vibration. This internal molecular motion facilitates rapid heat generation and mass transfer, enabling high evaporation rates without requiring high external temperatures or pressures, thus protecting equipment from thermal stress and corrosion.