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首页> 外文期刊>Combustion Science and Technology >Optimizing the Combustion of Low-Quality Coal by the Wall Wind Auxiliary Combustion Method in a Tangentially Fired Utility Boiler
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Optimizing the Combustion of Low-Quality Coal by the Wall Wind Auxiliary Combustion Method in a Tangentially Fired Utility Boiler

机译：切向燃烧电站锅炉壁风辅助燃烧法优化劣质煤燃烧

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摘要

Adopting the low NOx combustion technologies in tangentially fired utility boilers, burners cannot maintain flame stability, coal adaptability, or high combustion efficiency. Generally, high-temperature corrosion and slagging occurs, especially when burning low-volatile coal or anthracite. Thus, a wall wind auxiliary combustion system is developed. Here, a part of the corner secondary air is transformed into wall wind, which is then directed vertically into the furnace through the water-cooled walls, thereby optimizing the combustion organization of the corner injections downstream. Pre-modification and post-modification results are compared by simulation in a 600 MWe boiler. The results show that wall wind prevents the injection downstream from skewing into the wall. As such, the high-temperature area near the water-cooled walls disappears and the flame center moves downwards. The combustion efficiency is also improved. The wall wind maintains oxidization near the water-cooled walls, thereby reducing the risk of high-temperature corrosion and slagging. Finally, the average NO concentration at furnace outlet is reduced by 10%. In the industrial application of this technology, the outlet steam temperature of the low temperature superheater decreases up to 20 K, and the NOx emission at boiler outlet decreases up to 20%, which is consistent with the simulation results.
机译：在切向燃烧的电站锅炉中采用低NOx燃烧技术的燃烧器无法保持火焰稳定性，煤适应性或高燃烧效率。通常，会发生高温腐蚀和结渣，尤其是在燃烧低挥发性煤或无烟煤时。因此，开发了壁风辅助燃烧系统。在这里，一部分角落的二次空气转化为壁风，然后通过水冷壁垂直引导到熔炉中，从而优化了下游角落注入的燃烧组织。在600 MWe锅炉中通过仿真比较了修改前和修改后的结果。结果表明，壁风可防止下游的注入偏斜到壁中。这样，水冷壁附近的高温区域消失，火焰中心向下移动。燃烧效率也得到提高。壁风在水冷壁附近保持氧化，从而降低了高温腐蚀和结渣的风险。最后，炉子出口的平均NO浓度降低了10％。在该技术的工业应用中，低温过热器的出口蒸汽温度降低了20 K，锅炉出口的NOx排放降低了20％，这与模拟结果是一致的。

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