The invention relates to the technical field of waste water
evaporation drying, in particular to a waste water
evaporation drying method and
system based on mixed
molten salt heat storage, and the
system comprises a light condensing and guiding unit, a
molten salt heat storage unit, a heat exchange circulation unit and an
evaporation drying unit; the light condensing and guiding unit comprises a
Fresnel lens and a
quartz glass
guide tube; the fused salt heat storage unit comprises a fused salt heat
storage tank and a fused salt pump, and mixed fused salt is arranged in the fused salt heat
storage tank; the heat exchange circulating unit comprises a fused salt steam
heat exchanger, a steam heat accumulator, a waste steam tank, a desalted
water storage tank, a waste steam water
circulating pump, a desalted water feeding pump and a condenser; the evaporation drying unit comprises an evaporation dryer and an evaporation condensate
storage tank, the evaporation dryer is communicated with the steam heat accumulator, and the evaporation condensate storage tank is connected with the condenser. The
Fresnel lens and the
quartz glass guide
pipe are combined for light gathering and light guiding, precise tracking and efficient collection of
sunlight are achieved in cooperation with the
solar tracker, and the heat conduction efficiency is greatly improved.