660MW二次再热机组回热系统节能减排研究

发布时间：2018-03-17 03:15

本文选题：二次再热机组　切入点：回热系统　出处：《汽轮机技术》2014年05期 　论文类型：期刊论文

【摘要】：以某在建660MW超临界二次再热机组回热加热系统为对象,采用损分布矩阵方程和单耗理论分析了不同负荷下各加热器效率、损和附加煤耗的分布特征,依据《火电厂大气污染物排放标准》讨论了附加煤耗引起的污染物排放状况。研究表明:该二次再热机组高加侧总损和总附加煤耗均高于低加侧,3号高加引起的能耗和污染物排放量最大,2号和4号高加外置蒸汽冷却器效果明显使其经济性显著。总体上,二次再热机组高加侧的效率高于一次再热机组,而低加侧恰相反。受蒸汽参数不同和结构变化的影响,同负荷下两种机组的损和附加煤耗分布的差异较大。100%负荷下,二次再热机组回热系统的附加煤耗及其引起的CO2、SO2、NOx和碳粉尘排放量分别为3.35g/(k W·h)、38 041.35t/a、1 045.03t/a、579.89t/a、10 515.50t/a。
[Abstract]:Taking the regenerative heating system of a 660MW supercritical secondary reheat unit under construction as an object, the distribution characteristics of heater efficiency, loss and additional coal consumption under different loads are analyzed by using the loss distribution matrix equation and the unit consumption theory. According to the Standard of Atmospheric Pollutant Emission in Thermal Power Plant, the pollutant emission caused by additional coal consumption is discussed. The results show that the total loss and total additional coal consumption of the secondary reheat unit are higher than those of the low additive side. The energy consumption and pollutant discharge are the largest, and the effect of high addition steam cooler No. 2 and No. 4 makes its economy remarkable. The efficiency of high side addition of secondary reheat unit is higher than that of primary reheat unit, but the low side is opposite. Under the influence of different steam parameters and structural changes, the loss and additional coal consumption distribution of the two units under the same load are different from each other by .100%. The additional coal consumption and the emission of CO _ 2o _ 2SO _ 2N _ x and carbon dust in the regenerative system of secondary reheat unit are 3.35 g / kg / kg W 路h ~ (-1), 38 041.35 t / a / a ~ 1 045.03 t / a / a ~ 579.89 t / a / a ~ (10 515.50) t / a, respectively.
【作者单位】：华北电力大学能源动力与机械工程学院;
【分类号】：TM621

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