NH{sub 3} formation and destruction during the gasification of coal in oxygen and steam
- Monash University, Vic. (Australia). Department of Chemical Engineering
The study was conducted to investigate the formation and destruction of NH{sub 3} during the gasification of coal in atmospheres containing O{sub 2} and steam. A Victorian brown coal was gasified in a novel bench-scale fluidized-bed/fixed-bed reactor at 800{sup o}C in atmospheres containing 2000 ppm O{sub 2}, 15% H{sub 2}O, or 2000 ppm O{sub 2} + 15% H{sub 2}O. A NH{sub 3} standard gas was also used to study the destruction of NH{sub 3} in the gas phase and through gas-solid interactions. Sand, char, and coal ash were all found to enhance the destruction of NH{sub 3}. An atmosphere containing O{sub 2} alone does not favor the conversion of char-N into NH{sub 3} but favors the destruction of NH{sub 3} through various mechanisms. The introduction of H{sub 2}O into the gasification system greatly favors the conversion of char-N into NH{sub 3} and inhibits the destruction of NH{sub 3}. The formation and destruction of NH{sub 3} in an atmosphere containing 15% H{sub 2}O was similar to that in an atmosphere containing 15% H{sub 2}O and 2000 ppm O{sub 2}, indicating the dominant effects of steam in the formation and destruction of NH{sub 3} in a gasifier.
- OSTI ID:
- 20939565
- Journal Information:
- Environmental Science and Technology, Vol. 41, Issue 15; Other Information: chun-zhu.li@eng.monash.edu.au; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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