Overview
ABSTRACT
Risks and prevention means to be implemented when using activated carbon filters, in order to treat air loaded with pollutants and especially VOCs, are dealt with in this article. Some accident examples are documented. Mechanisms of exothermicity and their visualization are also presented. In order to achieve a better understanding of the phenomena, and thus control them, the influence of operating conditions on heat release is described and analyzed. Deterministic models are proposed in order to understand and predict local temperatures during VOC adsorption onto activated carbon.
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Read the articleAUTHORS
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Pierre LE CLOIREC: Professor - Director, École nationale supérieure de chimie de Rennes (ENSCR)
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Pascaline PRÉ: Assistant Professor, HDR - GEPEA UMR CNRS 6144 – École des mines de Nantes
INTRODUCTION
Activated carbon is used extensively as a universal adsorbent for flue gas treatment, eliminating volatile organic compounds (VOCs) and odorous molecules present in industrial gaseous emissions . In France in 2010, activated carbon adsorption plants accounted for around 30-35% of the total number of plants treating VOC-laden gaseous emissions. Generally speaking, these plants take the form of fixed beds lined with grains of activated carbon (virgin or impregnated), through which the air or gas to be treated passes. The transfer of contaminants from the gas phase into the porosity of the carbonaceous material enables the gas to be purified. After saturation, the activated carbon is either placed in a landfill, reactivated in a plant, regenerated in situ by a heat transfer fluid (steam, hot gas) or by intrinsic heating of the material (electrodesorption, for example)
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KEYWORDS
VOC | implementation | adsorption | activated carbon
Risks and prevention in VOC adsorption plants
Examples of incidents and accidents
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