Record Display for the EPA National Library Catalog

RECORD NUMBER: 38 OF 57

Main Title Modeling Suppression of Dioxin Formation during Coal Combustion.
Author Telfer, M. A. ; Gullett, B. K. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. National Risk Management Research Lab. ;Oak Ridge Inst. for Science and Education, TN.
Publisher 2000
Year Published 2000
Report Number EPA/600/A-01/117;
Stock Number PB2002-102294
Additional Subjects Air pollution control ; Coal combustion ; Polychlorinated dibenzodioxins ; Refuse derived fuels ; Furans ; Halohydrocarbons ; Coal ; Biolers ; Dioxins ; Mathematical models ; Combustion products ; Polychlorinated dibenzofurans ; Combustion kinetics ; Sulfur dioxide ; Hydrogen chloride ; Sorbent injection process ;
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NTIS  PB2002-102294 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 18p
Abstract
The paper discusses a homogeneous, gas-phase reaction mechanism that has been developed to explain sulfur (S) and chlorine (C1) interactions in an industrial, fire-tube boiler, using No. 2 fuel oil (0.03% S) doped with copper naphthenate (CuNA) and 1,2-dichlorobenzene (1,2-diC1Bz). The experiments were intended primarily for the investigation of polychlorinated dibenzodioxin and furan (PCDD/F) formation. However, significant reduction of sulfur dioxide (SO2) from combustion of No. 2 fuel oil was also observed upon injection of 1,2-diC1Bz. Interaction between S and C1 has been of significant interest due to the potential of S to suppress the formation of PCDDs/Fs during cofired combustion of high-S coal with municipal waste (MW). A suggested mechanism is the gas-phase reaction SO2+C12+H20=S03+2HC1 that converts active molecular chlorine (C12)-formed in the post-flame zone by the metal-catalyzed Deacon process-to inactive hydrogen chloride (HC1). In this study, the gas-phase suppression reaction is represented by a series of elementary reaction steps compiled from previously validated reaction mechanisms. The model was able to explain the observed rapid conversion of S02 to S03 in the boiler experiments upon injection of 1,2-diC1Bz to a HC1 conversion of 60%. These results present a possible mechanism for gas-phase S and C1 interactions and a potential means of elucidating the S02 suppression mechanisms of PCDD/F formation during cofired combustion of high-S coal and MW.