This paper reports an experimental investigation on the influence of secondary air ratio (SAR) on gas-solid mixing and combustion, which carried out in a 300 MWe circulating fluidized bed boiler. The boiler furnace has a large width-depth ratio of 3.35 and 3 cyclones arranged asymmetrically. The parameters studied were temperature distribution of bed, flue-gas temperature, solid concentration and NOX emission. Results showed that temperature was not evenly distributed along the width of the furnace. The temperature of middle zone was 50~80°C higher than side zones. The temperature profiles became more uniform when SAR increased. Both average bed temperature and bed temperature deviation decreased with increment of secondary air. Moreover, average solid concentration of the furnace increased with increasing SAR. SAR had no distinct effect on average flue-gas temperature but temperature distribution of the 3 exits became more uniform when SAR increased. NOX emission was less than 160 mg/m3 during the test and decreased with increasing SAR.
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机译：本文报道了对循环流化床锅炉300mWE循环流化床锅炉进行二次空气比（SAR）对气固混合和燃烧影响的实验研究。锅炉炉的宽度深度比为3.35和3个旋风分离器。研究的参数是床，烟气温度，固体浓度和NOx排放的温度分布。结果表明，温度沿炉子的宽度均匀地分布。中间区的温度高于侧带50〜80°C。当SAR增加时，温度曲线变得更加均匀。平均床温和床温度偏差随二次空气的增量而降低。此外，随着SAR的增加，炉的平均固体浓度增加。 SAR对平均烟道气温度没有明显的影响，但是当SAR增加时，3个出口的温度分布变得更加均匀。在测试期间，NOx发射量小于160mg / m 3 ，随着SAR的增加而降低。
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