Clean production process and device for sulfur recycling and alkylated waste acid combined treatment

[0039] An oil refinery affiliated to a petrochemical group, Claus sulfur flue gas 7700Nm 3 / h,SO 2 Content 670mg / Nm 3 , H 2 The O content is 9.4%, and the temperature is 750°C. Firstly, 0.5MPa saturated steam is produced as a by-product of heat recovery by waste heat boiler, and the flue gas temperature is as low as 180°C; then, after washing and dust removal in the scrubber, the temperature is reduced to below 35°C, and the plate heat exchanger and cooling tower are used to indirect heat exchange and reduce circulation The temperature of the washing liquid; then the sulfur-containing flue gas passes through the electric demister to remove impurities such as water droplets and mist, and then enters the desulfurization tower, where it is sprayed and absorbed by hydrogen peroxide solution, and the SO in the tail gas 2 Reduced to 20mg / Nm 3 Next, empty the drain. As the desulfurization cycle absorbs, the concentration of dilute acid in the circulating fluid increases gradu