Halogen emissions from coal combustion, IEACR/45

Author(s): LL Sloss

Ref: IEACR/45
ISBN: 92-9029-198-2
Published Date: 01/02/1992
No. of Tables: 29
No. of Figures: 17
No. of Pages: 62

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Natural sources, the sea in particular, are the major source of chlorine, bromine and iodine to the atmosphere. Human activities, especially industrial sources such as aluminium manufacture, are the major global source of fluorine emissions. In many developed countries, coal combustion is the largest source of chlorine from human activities and may also be a predominant source of fluorine. Emissions from coal combustion are in the form of highly soluble acidic gases which can contribute to acid rain. The individual halogen contents of coal can vary by a factor of ten or more, proximity of the mine to the sea during coal formation being the greatest influence. Combustion conditions and pollution control equipment may appreciably reduce the eventual emissions of halogens to the atmosphere from coal combustion. Those processes designed to control emissions of SOx, such as limestone addition to the boiler and FGD, can be especially effective in reducing emissions of the acidic halogen gases. In most countries halogen emissions from coal combustion are not considered to be of environmental concern. With the continued implementation of FGD, emissions of halogens for coal combustion are not likely to be a problem in the future.

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