Abstract
Desulfurization and purification of flue gas have long been important issues regarding environmental conservation. However, acid rain and atmospheric pollution are still generated by many chimneys all over the world. Since flue gas in general contains much SO2 and water vapor, desulfurization could be realized by condensing SO2 and water as acid water in a process similar to the formation of acid rain. This process was tested using a water fog spray system which includes a cooling tower. Flue gas generated by burning LP gas and added SO2 gas were introduced to the top of the cooling tower. The results showed that as the temperature of the flue gas approached the water temperature, the desulfurization ratio increased and reached nearly 100%. When PVC film was burned to generate gas containing Cl2 and its black smoke compounds, water fogging resulted in a change from black to white smoke generated from the system. It is considered that simple and inexpensive modification of existing chimneys can eliminate the problem of chimneys producing atmospheric pollution and acid rain.
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