The invention discloses a desulfurization
gypsum dechlorination and upgrading process
system, and belongs to the technical field of alpha semi-hydrated
gypsum production. In a material
cascade drying system of the process, a material outlet of a reaction device is communicated with a material inlet of a high-pressure
slurry separation and
dehydration device; a material outlet of the high-pressure
slurry separation and
dehydration device is communicated with a material inlet of the
flash evaporation device, a material outlet of the
flash evaporation device is communicated with a material inlet of the high-temperature
drying device, and a separated steam outlet of the
flash evaporation device is communicated with a steam inlet of the
solid-liquid mixing device; a separated water outlet of the high-pressure
slurry separation and
dehydration device is communicated with a high-pressure inlet of the multi-stage
water circulation system, a separated water outlet of the flash
evaporation device is communicated with a steam inlet of the
raw material reaction system, and a separated water outlet of the high-temperature
drying device is communicated with a low-pressure inlet of the multi-stage
water circulation system. According to the process, the
energy consumption of the system is reduced through a
cascade drying method, drying water with different pressures is effectively utilized through a multi-stage
water circulation system, and the heat loss of the system is reduced through heat
recovery.