二次再热器热力计算分室模型的研究  

Research on Cell Models for Thermodynamic Calculation of Double Reheaters

作　　者：李德龙[1,2] 张忠孝[1] 于娟[1] 范浩杰[1] 董建聪[1] 高昊天[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]中航商用航空发动机有限责任公司,上海200241

出　　处：《动力工程学报》2016年第7期519-524,共6页Journal of Chinese Society of Power Engineering

基　　金：国家科技支撑计划课题资助项目(2012BAA12B02)

摘　　要：提出了二次再热器热力计算的分室模型,阐述了分室原则、分室方案、计算流程及方程表达,并采用该模型对二次再热器进行热力计算和分析.按照分室原则,根据烟气的冲刷和蒸汽的流动方向将高温过热器分成Ⅰ、Ⅱ、Ⅲ、Ⅳ4个分区,根据高温再热器与高温过热器的布置关系将一、二次再热器均分成Ⅰ、Ⅱ、Ⅲ3个分区,按照烟气与蒸汽的流程顺序完成各区的计算.结果表明:主蒸汽计算温度均在610℃附近,一次再热器与二次再热器出口蒸汽温度也在600℃以上,与设计值相比,锅炉最大连续蒸发量(BMCR)工况下两者温度偏差在0.6%以内,不同工况下温度偏差均可通过调节减温水量等方法进行控制;该模型可较好地完成二次再热器的热力计算,且简便易行.A concept of cell models was proposed for thermodynamic calculation of double reheaters, while the cell dividing principles and schemes were described, including the calculation procedure and equations, etc. With the models, thermodynamic calculation and analysis were conducted on the double reheaters. Based on the dividing principles, high-temperature superheaters were divided into four cells （Ⅰ, Ⅱ, Ⅲ and Ⅳ） according the direction of flue gas and steam flow, while the primary and secondary high-temperature reheater were uniformly divided into three cells （Ⅰ, Ⅱ and Ⅲ） according to the arrangement relationship between superheaters and reheaters. Calculations were then conducted on each of the cells under different working conditions in the sequence of flue gas and steam flow. Results show that the calculated main steam temperature is around 610℃ and the outlet steam temperatures of reheaters are both above 600℃, with an error within 0.6% under BMCR condition, compared with the design value, which could be controlled by adjusting the flow rate of desuperheating water under all the conditions. This model is proved to be applicable for thermodynamic calculation of double reheaters, simply and easily.

关 键 词：二次再热器 分室模型 分室原则 热力计算 

分 类 号：TK223.3[动力工程及工程热物理—动力机械及工程]