燃煤锅炉空气分级燃烧降低NOx排放的数值模拟
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摘要: 为了降低燃煤电站锅炉的NOx排放量，在阐述空气分级配风方法降低NOx生成机理的基础上，应用CFD计算软件FLUENT 6.0，对一台330?MW电站锅炉采用空气分级配风方式，对其炉内燃烧过程进行了冷态、热态的数值模拟。分析比较了NOx排放的测试数据与模拟数据。结果表明，旋流燃烧器对冲布置的锅炉炉内空气呈对称分布，炉内温度沿炉膛高度先升高，然后又略有降低。炉内燃烧区温度最高，O.2体积分数最低，NOx密度最高，随着炉膛高度的增加，温度和NOx密度逐渐降低。对现有锅炉在不进行结构改造和不增加设备投资情况下，通过对某些燃烧器功能的适当调整，运用空气分级技术达到了降低NOx的目的。Abstract: Based on the mechanism of reducing NOx emission with staged-air combustion technology, the numerical simulation using CFD (FLUEBT6.0) software on the combustion process in the cold and hot states with staged-air technology for a 330 MW coal-fired power plant and the comparison of simulated NOx emission values with the tested NOx emission data were conducted. The results indicate that aerodynamic distribution is symmetrical in a utility boiler with opposed-installation whirl burners. The temperature first rises along with furnace height and then slightly decreases. In the combustion zone, the temperature and NOx concentration are the highest, while the oxygen concentration is the lowest. Without reconstruction and additional equipment cost, the staged-air technology can reach a low NOx emission by regulating some burners for the existing boilers.
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Key words:
- staged-air combustion /
- NOx /
- numerical simulation /
- coal-fired utility boiler
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