Release of NO from the combustion of coal chars

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Combustion and Flame

DOI:https://doi.org/10.1016/S0010-2180(96)00080-6· OSTI ID:413489

Harding, A W; Brown, S D; Thomas, K M ^[1]

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1. Univ. of Newcastle upon Tyne (United Kingdom)

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--1,323 K) 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.

• OSTI ID: 413489
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 4 Vol. 107; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CHARS
CHEMICAL REACTION YIELD
COAL RANK
COMBUSTION KINETICS
NITRIC OXIDE
TEMPERATURE DEPENDENCE