Boiler Chemical Cleaning: Doing It Correctly - POWER MagazineSep 1, 2014 . Contamination events increase the amount of deposit in the boiler and its . Changing fuels, such as from coal to gas, or modification of the.contaminated scales in coal boilers,coal | National Geographic SocietyDec 22, 2012 . Coking coal is used in large-scale industrial processes. The coal is coked, . Instead, anthracite is mainly used in stoves and furnaces. Anthracite is also used . Waterways are cut off or contaminated by valley fill. Habitats are.
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