The invention provides a
sulfate-containing waste liquid
treatment system and a
sulfate-containing waste liquid treatment method for
acrylonitrile and a combination device thereof, the
system comprises at least two sets of waste liquid treatment units and a set of
flue gas
treatment unit,
sulfate waste liquid is divided into two strands to enter the two sets of waste liquid treatment units for
combustion,
waste heat utilization and
quenching purification, the discharged
sulfur-containing
flue gas is collected and enters a set of
flue gas
treatment unit, the
sulfur-containing
flue gas subjected to deep cooling, demisting and
drying can be directly used for producing high-purity
sulfuric acid, and a two-end and one-
tail mode is adopted, so that the operation flexibility of the
system is improved, and the treatment pressure is reduced. In the waste liquid
treatment unit, a high-temperature reaction device adopts segmented air distribution, so that sufficient
combustion of waste liquid is ensured, and SO2 loss is reduced; a special temperature field and structural design in the
waste heat boiler can prevent the heat exchange device from scaling and blocking; a
venturi scrubber is adopted in the
quenching purification device to quench the
flue gas, and a protective liquid film is formed on the contact interface of the high-temperature
flue gas and a
liquid phase, so that the temperature of equipment is effectively reduced, and
corrosion of the high-temperature flue gas is prevented.