發(fā)布時間：2018-07-15 17:06

【摘要】：2011年我國提出了更加嚴格的火力發(fā)電廠大氣污染物排放標準,為進一步大幅度削減燃煤電廠污染物排放總量,各發(fā)電集團主動提出將燃煤電廠污染物排放標準向“燃氣發(fā)電機組排放標準”看齊。因此燃煤鍋爐超凈排放改造是近期燃煤電站節(jié)能減排工作的重點。以某電廠660MW超臨界機組的脫硝系統(tǒng)為研究對象,首先從電廠的NO_x生成機理入手,分析了爐內低氮技術和煙氣脫硝技術,提出了脫硝工藝選取方法。其次,以鍋爐變工況燃燒調整中關鍵參數(shù)為研究對象,對燃燒調整的出口氧量、水煤比、SOFA風量等參數(shù)進行解耦并重新組合進行分析,得出控制參數(shù)影響煙氣中NO_x含量異常升高的原因,探討了660MW超臨界鍋爐機組燃燒控制參數(shù)與NO_x濃度的動態(tài)特性關系。最后,分析了影響SCR煙氣脫硝系統(tǒng)效率的因素,結合運行參數(shù),確定了運行最優(yōu)工況。研究表明燃煤機組低氮燃燒及SCR技術的運行優(yōu)化在確保NO_x排放濃度控制在環(huán)保要求的范圍內的前提下,可實現(xiàn)爐內高效燃燒和SCR經(jīng)濟運行。其研究結果可為燃煤電站的優(yōu)化設計和運行提供理論和技術支撐,對已運行電廠脫硝系統(tǒng)優(yōu)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.
【學位授予單位】：華北理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM621.2

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