摘要
为了准确高效计算带尖峰冷却系统的空冷机组的背压,以便于分析尖峰冷却系统的经济性,分别用非线性曲面拟合计算空冷岛背压、对数平均温差法计算尖峰凝汽器背压。利用两个凝汽器背压相等这一条件建立方程,应用二分法求解影响背压的凝汽量参数,确定凝汽量后进一步计算背压值。研究表明,非线性曲面拟合计算的空冷岛背压计算公式精度较高,可以满足工程计算要求;二分法求解尖峰凝汽量迭代次数少,运算速度快,精度高,计算所得两个凝汽器的背压差值在0.001k Pa以内。计算代码可用于Excel VBA编辑器中,直接用于单元格计算。
In order to calculate the back pressure of air-cooled units with peak cooling system accurately and efficiently,to analyze the economy of peak cooling system,air-cooling island back pressure is calculated by nonlinear curve fitting and peak condenser back pressure is calculated by LMTD method. The equation is established using the condition that the two condenser back pressures are equal,the dichotomy method is used to solve the parameter of condenser flow affecting the backpressure,and then to further calculate the back pressure value after determining the amount of condensate. The study shows that the calculation formula of air-cooling island backpressure calculated by nonlinear curve fitting has more accuracy,which can meet the engineering calculation requirements; The dichotomy is used to calculate peak condenser flow,which has less iterative times,more quick calculation speed and higher accuracy,the calculated back pressure difference value of two condensers is within 0. 001 k Pa. The calculation code can be used in the Excel editor and used directly in cell calculation.
作者
徐正
张晴
崔建勋
赵承东
曾祥川
XU Zheng;ZHANG Qing;CUI Jianxun;ZHAO Chengdong;ZENG Xiangchuan(Hebei Electric Power Survey ＆ Design Institute,Shijiazhuang 050031 China;Liaoning University of Technology,Jinzhou 121001 China;Hebei Jiantou Shahe Power Generation Co.,Ltd.,Shahe 116085,China;Hebei Electric Power Survey and Design Engineering Research Center,Shijiazhuang,050031,China)
出处
《黑龙江电力》
CAS
2018年第3期265-270,共6页
Heilongjiang Electric Power
关键词
直接空冷
干湿联合
凝汽器
背压
尖峰冷却
direct air cooling
dry -wet combined
condenser
backpressure
peak cooling
