Role of char during reburning of nitrogen oxides. Final report, October 1, 1993--September 30, 1996
Technical Report
·
OSTI ID:10109302
- Univ. of Mississippi, University, MS (United States). Dept. of Chemical Engineering
- Kansas State Univ., Manhattan, KS (United States). Dept. of Chemical Engineering
In the first phase of the present study, simulated reburning have been performed in an alumina flow reactor operated with a synthetic flue gas at a stoichiometric ratio (SR) 1.1, at 1,100 C and with a residence time approximately 0.2 s. Reburning fuels in this study include methane, one bituminous coal, two lignites, chars derived from the bituminous coal and the two lignites, and the bituminous coal char impregnated with CaO. The objective of the second part of this program has been to assess the technological potential of heterogeneous reburning. Specifically, it includes the investigation of (1) the parameters governing the heterogeneous reactions, (2) the rates of NO reduction and mass transfer limitations, and (3) the possible mechanisms of heterogeneous reburning. Experiments have been performed in a flow reactor with a simulated flue gas at a stoichiometric ratio (SR) 1.1. Reburning fuels in this study include chars derived from Pittsburgh {number_sign}8 bituminous coal and Mississippi lignite. Chars were produced in N{sub 2} by suspending a sample basket in a tube furnace. Pore structure analyses include BET-N{sub 2}, BET-CO{sub 2}, and DR-CO{sub 2} surface areas, pore size distribution, micropore volume, total pore volume, and average pore radius. Three areas of the studies during the second phase of the program have shown potentially significant technological impact: the role of CO in heterogeneous reburning, surface area and pore structure analyses of chars before and after the reactions, and the effect of particle size of a bituminous coal before pyrolysis on reburning efficiency. Major observations and their implications are discussed.
- Research Organization:
- Univ. of Mississippi, Dept. of Chemical Engineering, University, MS (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
- DOE Contract Number:
- FG22-93PC93227
- OSTI ID:
- 10109302
- Report Number(s):
- DOE/PC/93227--T10; ON: TI98020002
- Country of Publication:
- United States
- Language:
- English
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