The invention discloses a screw
cascade waste heat energy generating device and a screw
cascade waste heat energy generating method. The device comprises at least
one stage of generator sets, and each stage of generator sets comprises a flooded
evaporator, a shell and tube preheater, a reservoir, a condenser and a screw expansion
machine, wherein a shell pass outlet of the shell and tube preheater is communicated with the tube pass of the flooded
evaporator, and a tube pass outlet of the shell and tube preheater is communicated with the shell pass of the flooded
evaporator; an opening at the bottom of the reservoir is communicated with a tube pass inlet of the shell and tube preheater through a circulating pipeline on which a working medium
circulating pump and a
check valve are arranged; the condenser is connected above the reservoir; and a rotating shaft of the screw expansion
machine is connected with a rotating shaft of a
synchronizing generator, a shell pass outlet of the flooded evaporator is connected with an inlet of the screw expansion
machine through a pipeline on which a flow regulating valve is arranged, and an outlet of the screw expansion machine is communicated with the shell pass of the condenser. By using the device and the method, the
heat power generation with large
temperature drop at low temperature is realized, and the conversion efficiency of low-temperature
heat energy is improved.