槽式集热系统流速及布置优化  

Velocity and Layout Optimization of Parabolic Trough Solar Systems

作　　者：于刚[1] 罗娜[1] 侯宏娟[1] 杨勇平[1] 

机构地区：[1]华北电力大学国家火力发电工程技术研究中心,北京102206

出　　处：《动力工程学报》2015年第6期501-508,共8页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51206049;51025624);国家高技术研究发展计划(863计划)资助项目(2012AA050604);新能源电力系统国家重点实验室开放课题资助项目(LAPS13002)

摘　　要：通过对槽式太阳能集热器结构及能量转换过程特性的研究,建立了基于多热容变物性的集热器动态仿真模型,并由LS-2型槽式集热器实验数据进行了验证.在仿真平台上结合泵、阀门等模型组建起集热系统仿真模型,并根据SEGS-VI的电站实际运行数据进行了对比验证.在此基础上,分析研究了系统的集热效率和所消耗总泵功随太阳辐照量及导热油流速的变化,得到了不同工况下集热系统的最优折合效率、导热油最佳流速和单支路最优长度.结果表明:在相同的导热油进、出口温度下,太阳辐照量越大,集热系统最优折合效率越高,当太阳辐照量从500 W/m2升至1 000W/m2时,导热油最佳流速从2m/s变化到3m/s;在同一太阳辐照量下,系统最优折合效率随导热油工作温度的升高而降低.Based on study of parabolic trough solar collector structure and its photo-thermal energy conversion process,a lumped parameter dynamic model with features of multiple heat capacities and changeable physical properties was developed and subsequently verified with experimental data of LS-2parabolic trough solar collectors.Combining with models of the pump,valve and other modules in the simulation platform,a model of parabolic trough solar system was set up and verified with actual operation data of SEGS-VI plants.On above basis,the variation trends of collecting efficiency and pump power consumption with diverse irradiation and oil velocities were analyzed,after which the optimal equivalent efficiency,oil velocity and length per loop were determined under different operating conditions.Results show that at the same inlet and outlet oil temperature,the greater the solar irradiation is,the higher the equivalent efficiency of the solar system will be.When the solar irradiation rises from 500W/m2 to 1 000W/m2,the optimal velocity of hot oil varies from 2m/s to 3m/s.Besides,under constant solar irradiation conditions,the optimal equivalent efficiency decreases with the increase of oil working temperature.

关 键 词：槽式集热系统 动态仿真 最优折合效率 优化设计 

分 类 号：TK513.1[动力工程及工程热物理—热能工程]