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Flue gas recirculation (FGR) is an important technical mean to improve the safety of circulating fluidized bed (CFB) boiler and reduce the generation of NO_x under low-load operation. In the present work, the relationships between temperature distribution of the boiler, NO_x, CO mass concentration and O₂ volume fraction of the flue gas at furnace outlet, the combustible matter content of fly ash and bottom slag and the flow rate of FGR under the load of 20%, 30% and 40% BMCR (boiler maximum continuous rating) were studied using one-dimensional chamber CFB combustion quasi-static model at a supercritical 350 MW CFB boiler. The results show that both the bed temperature and furnace exit flue gas temperature decrease with the increase of FGR flow rate, which the former decreases less than the latter. The temperature difference between the upper and lower furnace gradually decreases with the increase of FGR flow rate, which is more significantly affected by FGR flow rate at lower loads. The NO_x mass concentration of flue gas at the furnace exit shows a trend of decreasing first and then increasing with the increase of FGR flow rate, and the existence of the optimal FGR flow rate can make the unit operation economically and environmentally friendly. In addition, with the increase of the FGR flow rate, the CO mass concentration at the furnace outlet, combustible matter content of fly ash and bottom slag shows an increasing trend. The FGR significantly reduces the primary air oxygen volume fraction while ensuring that the fluidized air flow rate in the dense phase area is always higher than the protection value, which ensures the operation safety of the boiler under low load furtherly.

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烟气再循环（flue gas recirculation, FGR）是提高循环流化床（circulating fluidized bed, CFB）锅炉低负荷运行安全性、减少NO_x原始生成的重要技术手段。以某电厂超临界350 MW CFB锅炉为研究对象，采用一维小室CFB燃烧准静态数学模型研究了该锅炉在20%、30%、40%BMCR（最大连续负荷）下炉内温度分布，炉膛出口烟气NO_x、CO质量浓度，O₂体积分数，飞灰底渣可燃物含量等性能指标与FGR流量之间的关系。结果表明：床层温度、炉膛出口温度均随FGR流量的增加而降低，床层温度相对炉膛出口温度降低幅度较大，炉膛上下温差随FGR流量的增加逐渐缩小，较低负荷时炉膛上下温差受FGR影响更为显著；炉膛出口烟气NO_x质量浓度随FGR流量的增加呈现先降低再升高的趋势，存在最优FGR流量可使机组经济环保运行；随FGR流量的增加，炉膛出口烟气CO质量浓度、飞灰及底渣可燃物含量均呈现增加趋势；FGR的投入在显著降低一次风氧含量同时，保证密相区流化风量始终高于保护值，进一步保障了低负荷下锅炉运行安全性。

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元泽民（1993），男，博士研究生，主要研究方向为循环流化床锅炉高效清洁燃烧与利用，tyutthermo@foxmail.com。

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元泽民（1993），男，博士研究生，主要研究方向为循环流化床锅炉高效清洁燃烧与利用，tyutthermo@foxmail.com。

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