Role of char during reburning of nitrogen oxides. Fifth quarterly report, October 1, 1994--December 31, 1994
- Univ. of Mississippi, University, MS (United States)
- Kansas State Univ., Manhattan, KS (United States)
Research in this quarter focused on reburning with a bituminous coal, with its char, and with the char impregnated with CaO. In contrast to the high NO reduction activity of lignite char demonstrated in the last quarter, bituminous coal char contributes little NO reduction activity during reburning with the Pittsburgh 98 at stoichiometric ratios above 0.75. To enhance the reactivity of bituminous coal char with NO, char was impregnated with CaO before reburning. This impregnation/ion-exchange technique was developed for the verification of calcium`s catalytic role during lignite combustion in the early 1980s, and has been implemented, in the last decade in the catalytic oxidation of chars derived from synthetic carbon, lignite and peat with oxygen and N{sub 2}O. Preliminary experiments conducted in this quarter demonstrated that NO reduction in reburning can be enhanced, though not to the levels of lignite, by impregnating the bituminous coal char with CaO. The impregnation level, 0.43% of dried char, was much lower than those developed for other applications in the literature. Since the char was produced in N{sub 2}, the low impregnation level is probably due to lack of desired oxygen complexes, such as C(OO), on the char surface. The results of impregnated char implies that the CaO catalyzed char oxidation by NO may be an important reaction in lignite reburning. The practical impacts of these finding to the boiler practice may be important, and are discussed.
- Research Organization:
- Mississippi Univ., University, MS (United States). Dept. of Chemical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-93PC93227
- OSTI ID:
- 10122464
- Report Number(s):
- DOE/PC/93227-T4; ON: DE95007912; TRN: 95:002651
- Resource Relation:
- Other Information: PBD: 31 Jan 1995
- Country of Publication:
- United States
- Language:
- English
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