Sulphuric Acid Plants - Spent Acid Recovery Process


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Spent acid and/or hydrogen sulphide are burned at elevated temperatures to provide SO₂ gas. In the case of spent acid, fuel is burned along with the spent acid in the combustion chamber to achieve the required decomposition temperature. The wet SO₂ combustion gas is then cooled in a steam boiler to recover energy prior to entering the primary Dynawave Reverse Jet Scrubber. From the scrubber on, the process equipment arrangement will have some variation depending on the amount of insoluble generated in the combustion chamber.

After passing through the first three layers of MECS XLP and Cesium catalyst, SO₃ rich gas is cooled and absorbed with 98% sulphuric acid (H₂SO₄) in the Interpass absorption tower. The lean SO₂ gas flows through Brink Mist Eliminators to remove fine mist particles, thereby protecting downstream equipment. The clean gas is then reheated and enters the converter to complete the conversion of SO₂ to SO₃. The SO₃ formed is absorbed in 98% H₂SO₄ in the final absorbing tower. Brink Mist Eliminators are installed in the final tower to insure the stack gas will meet environmental regulations on acid mist.