PLANT FOR PRODUCTION OF SULFURIC ACID Russian patent published in 2003 - IPC

FIELD: production of sulfuric acid from sulfur. SUBSTANCE: proposed plant includes sulfur furnace, high- pressure waste-heat boiler connected with two-stage contact apparatus having several layers of catalyst; three layers of catalyst are located on first stage; proposed plant is also provided with heat exchangers mounted between layers of catalyst, drying tower, monohydrate adsorbers and finished product receivers. Plant includes also heat exchanger for preheating air and low-pressure waste-heat boiler. Inlet of air preheating heat exchanger is connected by tube space with outlet of heat exchanger mounted after third layer of catalyst of first stage of contact apparatus and outlet of tube space is connected with inlet of low-pressure waste-heat boiler. Inlet of said heat exchanger is connected by inter-tube space with outlet of drying tower and outlet of inter-tube space is connected with inlet of second conversion stage of contact apparatus. Low-pressure waste-heat boiler introduced additionally in plant is connected with air preheating heat exchanger on one side and with first-stage monohydrate adsorber on other side. Proposed method makes it possible to process gases of increased concentration (11.5 to 12% vol. SO₂) at sanitary standards strictly adhered to. EFFECT: enhanced efficiency and reliability. 2 cl, 2 dwg