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Ignition behavior of coal and biomass blends under oxy-firing conditions with steam additions.
- Source :
- Greenhouse Gases: Science & Technology; Oct2013, Vol. 3 Issue 5, p397-414, 18p
- Publication Year :
- 2013
-
Abstract
- The ignition behavior of coal and biomass blends was assessed in air and oxy-firing conditions in an entrained flow reactor. Four coals of different rank, an anthracite, a semi-anthracite, and two high-volatile bituminous coals, were tested in air and O<subscript>2</subscript>/CO<subscript>2</subscript> (21-35% O<subscript>2</subscript>) environments. For all the coals, deterioration in ignition properties was observed in the 21%O<subscript>2</subscript>/79%CO<subscript>2</subscript> atmosphere in comparison with air. However, the ignition properties were enhanced when the oxygen concentration in the O<subscript>2</subscript>/CO<subscript>2</subscript> mixture was increased. Coal and biomass blends of a semi-anthracite and a high-volatile bituminous coal with 10 and 20 wt% of olive residue were also used in the ignition experiments under air and oxy-firing conditions. The ignition behavior of the coals improved as the additions of biomass increased both in air and oxy-firing conditions. In particular, the effect of biomass blending was more noticeable in the ignition of the high rank coal. Since industrial oxy-coal combustion with a wet recycle would result in higher concentrations of H<subscript>2</subscript>O(v), the effect of steam addition on ignition behavior was also studied. A worsening in ignition behavior was observed when steam was added to the oxy-fuel combustion atmospheres, although an increase in the steam concentration from 10 to 20% did not produce any significant difference in the ignition characteristics of the fuels. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 21523878
- Volume :
- 3
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Greenhouse Gases: Science & Technology
- Publication Type :
- Academic Journal
- Accession number :
- 91615410
- Full Text :
- https://doi.org/10.1002/ghg.1368