元泽民,柯希玮,黄中,杨云凯,武广剑,刘青,马素霞,程亮,赵振宁

• 1:清华大学能源与动力工程系
• 2:太原理工大学电气与动力工程学院
• 3:晋能大土河热电有限公司
• 4:国网冀北电力有限公司电力科学研究院

摘要(Abstract)：

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NOx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NOx、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NOx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。

关键词(KeyWords)： 循环流化床锅炉;低负荷;烟气再循环;一维小室CFB燃烧模型;锅炉运行特性

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目（2022YFB4100301）;; 国网冀北电力公司科技资助项目（SGTYHT/21-HS-225）~~

作者(Author): 元泽民,柯希玮,黄中,杨云凯,武广剑,刘青,马素霞,程亮,赵振宁

DOI: 10.19666/j.rlfd.202305097

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