660MW超临界锅炉机组NO_x控制方法研究
发布时间：2018-07-15 17:06
【摘要】：2011年我国提出了更加严格的火力发电厂大气污染物排放标准,为进一步大幅度削减燃煤电厂污染物排放总量,各发电集团主动提出将燃煤电厂污染物排放标准向“燃气发电机组排放标准”看齐。因此燃煤锅炉超净排放改造是近期燃煤电站节能减排工作的重点。以某电厂660MW超临界机组的脱硝系统为研究对象,首先从电厂的NO_x生成机理入手,分析了炉内低氮技术和烟气脱硝技术,提出了脱硝工艺选取方法。其次,以锅炉变工况燃烧调整中关键参数为研究对象,对燃烧调整的出口氧量、水煤比、SOFA风量等参数进行解耦并重新组合进行分析,得出控制参数影响烟气中NO_x含量异常升高的原因,探讨了660MW超临界锅炉机组燃烧控制参数与NO_x浓度的动态特性关系。最后,分析了影响SCR烟气脱硝系统效率的因素,结合运行参数,确定了运行最优工况。研究表明燃煤机组低氮燃烧及SCR技术的运行优化在确保NO_x排放浓度控制在环保要求的范围内的前提下,可实现炉内高效燃烧和SCR经济运行。其研究结果可为燃煤电站的优化设计和运行提供理论和技术支撑,对已运行电厂脱硝系统优化改造提供思路。
[Abstract]:In 2011, China proposed more stringent emission standards for atmospheric pollutants from coal-fired power plants, in order to further reduce the total amount of pollutants emitted from coal-fired power plants. Each power generation group proposes to align the pollutant emission standard of coal-fired power plant with the gas generator emission standard. Therefore, the transformation of ultra-net emission of coal-fired boilers is the focus of energy conservation and emission reduction work in coal-fired power stations in the near future. Taking the denitrification system of 660MW supercritical unit in a power plant as the research object, starting with the mechanism of no _ x generation in the power plant, the low nitrogen technology and flue gas denitrification technology in the furnace are analyzed, and the selection method of denitrification process is put forward. Secondly, taking the key parameters of boiler combustion adjustment under different working conditions as the research object, the parameters such as outlet oxygen quantity of combustion adjustment and ratio of water to coal to sofa air volume are decoupled and recombined. The reasons for the abnormal increase of NOX content in flue gas are obtained, and the dynamic characteristic relationship between combustion control parameters and NOX concentration of 660MW supercritical boiler unit is discussed. Finally, the factors influencing the efficiency of SCR flue gas denitrification system are analyzed. The research shows that the low nitrogen combustion and the operation optimization of SCR technology can realize the high efficiency combustion and the economic operation of SCR on the premise of ensuring that the NOX emission concentration is within the scope of environmental protection. The research results can provide theoretical and technical support for the optimal design and operation of coal-fired power plants, and provide ideas for the optimization and reconstruction of denitrification systems in existing power plants.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621.2
[Abstract]:In 2011, China proposed more stringent emission standards for atmospheric pollutants from coal-fired power plants, in order to further reduce the total amount of pollutants emitted from coal-fired power plants. Each power generation group proposes to align the pollutant emission standard of coal-fired power plant with the gas generator emission standard. Therefore, the transformation of ultra-net emission of coal-fired boilers is the focus of energy conservation and emission reduction work in coal-fired power stations in the near future. Taking the denitrification system of 660MW supercritical unit in a power plant as the research object, starting with the mechanism of no _ x generation in the power plant, the low nitrogen technology and flue gas denitrification technology in the furnace are analyzed, and the selection method of denitrification process is put forward. Secondly, taking the key parameters of boiler combustion adjustment under different working conditions as the research object, the parameters such as outlet oxygen quantity of combustion adjustment and ratio of water to coal to sofa air volume are decoupled and recombined. The reasons for the abnormal increase of NOX content in flue gas are obtained, and the dynamic characteristic relationship between combustion control parameters and NOX concentration of 660MW supercritical boiler unit is discussed. Finally, the factors influencing the efficiency of SCR flue gas denitrification system are analyzed. The research shows that the low nitrogen combustion and the operation optimization of SCR technology can realize the high efficiency combustion and the economic operation of SCR on the premise of ensuring that the NOX emission concentration is within the scope of environmental protection. The research results can provide theoretical and technical support for the optimal design and operation of coal-fired power plants, and provide ideas for the optimization and reconstruction of denitrification systems in existing power plants.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621.2
【参考文献】
相关期刊论文 前10条
1 赵大周;李允超;郑文广;何胜;;660MW机组SCR喷氨策略的模拟研究[J];热能动力工程;2016年08期
2 姚建华;肖琨;;300MW四角切圆燃烧锅炉低氮燃烧优化改造研究[J];锅炉技术;2016年04期
3 孙灵芳;任，
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