Formation and Decomposition of N sub(2)O in Fluidized Bed Boilers
Emissions of N sub(2)O from industrial processes and power plants have been the subject of increased scrutiny of late due to a burgeoning awareness of potential climatic effects. A series of tests seeking to evaluate the emissions of N sub(2)O from different coal-fired appliances are described. Conv...
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| Published in | Fuel (Guildford) Vol. 74; no. 2; p. 165 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
01.02.1995
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| Online Access | Get full text |
| ISSN | 0016-2361 |
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| Abstract | Emissions of N sub(2)O from industrial processes and power plants have been the subject of increased scrutiny of late due to a burgeoning awareness of potential climatic effects. A series of tests seeking to evaluate the emissions of N sub(2)O from different coal-fired appliances are described. Conventional appliances tend to emit lower concentrations of this gas. However, fluidized beds typically emit higher concentrations of N sub(2)O because of their lower combustion temperatures. To further investigate this phenomenon, measurements were conducted on a circulating fluidized bed boiler having a thermal output of greater than 200 MW. The measurements were conducted under a variety of operating conditions. The limestone feedrate had a negligible impact on emissions. |
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| AbstractList | Emissions of N sub(2)O from industrial processes and power plants have been the subject of increased scrutiny of late due to a burgeoning awareness of potential climatic effects. A series of tests seeking to evaluate the emissions of N sub(2)O from different coal-fired appliances are described. Conventional appliances tend to emit lower concentrations of this gas. However, fluidized beds typically emit higher concentrations of N sub(2)O because of their lower combustion temperatures. To further investigate this phenomenon, measurements were conducted on a circulating fluidized bed boiler having a thermal output of greater than 200 MW. The measurements were conducted under a variety of operating conditions. The limestone feedrate had a negligible impact on emissions. Emissions of N sub(2)O from various coal fired appliances have been measured. The results show that conventional appliances generally emit low levels of N sub(2)O [<30 mg m super(-3) (STP)]. Fluidized beds usually emit considerably higher levels, due to the lower combustion temperatures prevailing in such plant. In order to study the mechanisms underlying N sub(2)O formation and destruction, emissions from coal combustion in a circulating fluidized bed boiler (CFBC) with a thermal output >200 MW were measured under various operating conditions. The results show that the effects of limestone feedrate and of the secondary to primary air ratio on N sub(2)O emissions were not significant. The highest temperature in the system appears to be the main factor affecting N sub(2)O emission. In a load changing cycle N sub(2)O emission increased from about 30 mg m super(-3) (STP) at full load to about 360 mg m super(-3) (STP) at part load conditions. |
| Author | Bonn, Bernhard Pelz, Gudrun Baumann, Herbert |
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| Snippet | Emissions of N sub(2)O from industrial processes and power plants have been the subject of increased scrutiny of late due to a burgeoning awareness of... Emissions of N sub(2)O from various coal fired appliances have been measured. The results show that conventional appliances generally emit low levels of N... |
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| Title | Formation and Decomposition of N sub(2)O in Fluidized Bed Boilers |
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