线性加权遗传算法的蒸汽管道摩阻和热损研究  

Identification and influence of friction and heat loss coefficients of steam pipeline based on linear weighted genetic algorithm

作　　者：朱兆喆 刘鹏 闻继伟 齐智猛 章雨然 范巍 ZHU Zhaozhe;LIU Peng;WEN Jiwei;QI Zhimeng;ZHANG Yuran;FAN Wei(Tianjin Cheng'an Thermal Power Co.,Ltd.,Tianjin 300202,China;School of Environmental Science and Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津市城安热电有限公司,天津300202 [2]天津大学环境科学与工程学院,天津300350

出　　处：《区域供热》2023年第5期18-25,35,共9页District Heating

摘　　要：建立了蒸汽管道水力热力耦合模型,通过构建评价函数,基于线性加权遗传算法使管道各节点温度、压力的计算值逼近真实值,实现了对摩阻系数、热损系数的辨识,并分析了摩阻系数和热损系数对管道温度、压力、流速、密度等参数变化的影响。结果表明随着摩阻系数的增加,管道末端的压力和管道末端蒸汽温度逐渐降低,而管道末端蒸汽流速逐渐升高,且升高得越来越快。随着热损系数的增加,管道末端蒸汽温度逐渐降低,蒸汽压力基本不变,蒸汽密度逐渐升高。摩阻系数从0.2增长到0.6时,管道末端蒸汽流速由22.18 m/s升至32.18 m/s,增幅45.1%;随着热损系数从0.4增长到1.2,管道末端蒸汽密度由6.53 kg/m^(3)升至6.69 kg/m^(3),增幅2.5%。The hydraulic and thermodynamic coupling model of steam pipeline is established,and the calculated values of temperature and pressure at each node of the pipeline are approximated to the real values based on linear weighted genetic algorithm by constructing evaluation functions.The identification of friction coefficient and heat loss coefficient is realized,and the influence of friction coefficient and heat loss coefficient on the changes of pipeline temperature,pressure,flow rate,density and other parameters is analyzed.The results show that with the increase of the friction coefficient,the pressure and steam temperature at the end of the pipeline gradually decrease,while the steam flow rate at the end of the pipeline gradually increases,and the increase is faster and faster.With the increase of heat loss coefficient,the steam temperature at the end of the pipeline gradually decreases,the steam pressure is basically unchanged,and the steam density gradually increases.When the friction coefficient increases from 0.2 to 0.6,the steam flow rate at the end of the pipeline increases from 22.18 m/s to 32.18 m/s,increasing by 45.1%.As the heat loss coefficient increased from 0.4 to 1.2,the steam density at the end of the pipe increased from 6.53 kg/m^(3)to 6.69 kg/m^(3),an increase of 2.5%.

关 键 词：蒸汽管道 线性加权 遗传算法 摩阻 热损 

分 类 号：TU995.3[建筑科学—供热、供燃气、通风及空调工程]