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Release of NO from the combustion of coal chars

Lookup NU author(s): Emeritus Professor Mark Thomas

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Abstract

The emissions of nitrogen oxides during coal combustion contribute to acid rain and are a major environmental problem. In this investigation, the release of nitric oxide during the combustion of coal chars prepared from a wide range of coals in an entrained flow reactor was investigated over a range of combustion temperatures (823 - 1323K) using a thermogravimetric analyzer coupled with a mass spectrometer. The conversion of char nitrogen to NO (NO/char-N) was studied in relation to coal and char structural characterization parameters. The results show that higher levels of conversion of char-N to NO were observed for the high-rank coal chars at lower combustion temperatures, where the reaction is under chemical control. As the combustion temperature increased, there was a decrease in the NO/char- N conversion ratio. Chars with low surface areas and low reactivities tend to have higher levels of conversion of char N to NO during combustion. The implications for the mechanism of NO reduction on the char surface and in the pores are discussed.


Publication metadata

Author(s): Harding AW, Brown SD, Thomas KM

Publication type: Article

Publication status: Published

Journal: Combustion and Flame

Year: 1996

Volume: 107

Issue: 4

Pages: 336-350

Print publication date: 01/12/1996

ISSN (print): 0010-2180

ISSN (electronic): 1556-2921

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/S0010-2180(96)00080-6

DOI: 10.1016/S0010-2180(96)00080-6


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