Sulphuric Acid Plants - Metallurgical Process


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Off gas from essentially any continuous or semi-continuous process that contains SO₂ gas is pulled through the primary Dynawave® Reverse Jet Scrubber where it is cleaned and cooled to its adiabatic saturation temperature by recirculation weak acid. Next, the gas is cooled in the gas-cooling tower, to a point where the moisture level is reduced to the amount required in the product acid. Next, depending on the level of impurities in the feed gas, a final Dynawave Jet Scrubber may be used. The final stage of gas cleaning is a wet electrostatic precipitator (WESP), which removes both liquid and solid particulate matter to prevent corrosion and fouling in the acid plant. The gas is then pulled through the high efficiency-drying tower where the remaining water vapour is removed. A Brink Mist Eliminator provides efficient acid mist removal for the protection of the main compressor. The dry, clean gas is then compressed and introduced 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.