The classic and mature washing and purification process for desulfurizing colored smelting gases

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At present, with the strengthening of environmental protection and the development of the non-ferrous smelting industry, significant progress has been made in China in the treatment of sulfur dioxide from smelting emissions and the production of sulfuric acid as a by-product. Sulfuric acid produced as a by-product of smelting now occupies a large share of the market for sulfuric acid in China. What is proposed here is that the classic and well-established washing and purification processes for smog from non-ferrous metal smelting include power wave washing, empty tower cooling, two-stage power wave washing, and two-stage electrostatic demisting. The question is: why is empty tower cooling necessary after power wave washing, given that the temperature of the smoke due to adiabatic evaporation is already low? What would be the consequences if empty tower cooling were not carried out? Could it have an impact on the subsequent electrostatic demisting, drying, or conversion processes? If we do not produce sulfuric acid, but instead use alkali to absorb the by-product sodium sulfite after power wave washing, and since cooling is required for the absorption process itself, we could eliminate the cooling of the empty tower and increase the area of the cooler during the absorption process, thereby making the process more compact. Is that possible? Furthermore, why is electrodesorption necessary? The sulfur trioxide content in the flue gas should be low; is electrodesorption used to remove sulfuric acid mist to meet the requirements of the catalysts used in subsequent conversion processes, or for some other reason? Generally, conventional desulfurization methods do not require electrostatic demisting. For example, in the process we used to produce sodium sulfite earlier, was electrostatic demisting necessary?