In an environment of urgent demand for flue gas desulfurization (FGD) installation, as a countermeasure to acid rain among developing countries, we have developed and put to practical use a stack type simplified wet FGD system. This is an offspring of our on-going pursuit of simplifying the wet limestone gypsum process which has proved its reliability in and out of Japan. For simplification of the process, the absorber, stack and gypsum thickener, which had conventionally been positioned separately, have been integrated by installation of the absorber incorporated into the stack, and making it a part of the absorber tank thickener. This has enabled drastic reduction of the equipment quantity as well as installation space. Further, we have developed a low cost vibration gypsum dewatering system. The first system was delivered to China as desulfurization for a boiler, and is currently being operated favorably.
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