Sulphuric Acid Plants - Sulphur Burning Process


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Ambient air is drawn through a high efficiency drying tower by the main compressor to remove moisture. A Brink® Mist Eliminator provides efficient acid mist removal, which is critical for protection of the main compressor. The compressed dry gas enters the sulphur burner where molten sulphur is burned in the presence of the dry air to produce high sulphur dioxide (SO₂) gas strength. The hot SO₂ combustion gas is then cooled in a steam boiler to the proper temperature for introduction to the converter system.

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.