Flue gas desulphurisation systems in coal fired power plants transform sulphur dioxide into gypsum slurry, which is then dewatered in vacuum belt filters. This process imposes tough demands on the mechanical, thermal and chemical capacity of the filter belt used. After petroleum coal is in this context the world's most important fossil energy source. In the year 2010 it covered 30% of global primary energy consumption [1], in Germany just under 40% of domestic power generation. The flue gas created when burning coal is being scrubbed in an ecologically responsible way in flue gas desulphurisation plants (FGDP) inter alia. FGD gypsum emerges as a byproduct of this process - about 7 million tonnes annually worldwide.
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