太阳能烟囱发电系统蓄热层的试验研究  

Experimental study on heat storage layers of solar chimney power generation systems

作　　者：左潞[1] 郑源[1] 沙玉俊[2] 李振杰[1] 刘文明 

机构地区：[1]河海大学能源与电气学院,江苏南京210098 [2]清华大学机械工程学院,北京100084 [3]丹华水利环境技术有限公司,上海200032

出　　处：《河海大学学报（自然科学版）》2011年第2期181-185,共5页Journal of Hohai University(Natural Sciences)

基　　金：河海大学自然科学基金(2007419611)

摘　　要：搭建了3台带有不同石块蓄热介质蓄热层的太阳能烟囱发电系统对比试验装置,在实际天气条件下,对该装置的运行性能进行了测试,并对试验结果进行了对比分析.结果表明:石块蓄热层具有储存热量的能力,随着蓄热层深度的增加,蓄热层内温度随外界影响就越小.系统内热气流的温升主要在集热棚的中前段,不同时间层热气流温升幅度不同.辐射强度、辐射时间和其他环境因素及集热棚集热性状都会对热气流温升产生一定的影响.石块蓄热材料的热容量和导热系数对蓄热层的平均温度和蓄热量影响较大,热容量大,蓄热层的平均温度日夜变化幅度相对较小,对于太阳能烟囱发电系统的发电峰谷差的调整有利.用同种石块作为集热和蓄热材料时,应合理选择石块材料的粒径和孔隙率,适当增大粒径和孔隙率可增强蓄热层的蓄热能力,有利于提高蓄热层的平均温度.没有太阳辐射时,蓄热层储存的热量能更好地加热气流.Three solar chimney power generation systems with heat storage layers of different stone heat storage media were constructed.The operation performances of the systems under actual weather conditions were tested,and the resuts were compared and analyzed.The test results show that the stone heat storage layer has heat storage capacity.With the increaesing depth of the storage layer,the effects of the environment on the temperature of the heat storage layer is smaller and smaller.The temperature rise of heat air flow in the system is mainly in the middle and front parts of the heat collector and its amplitude is different at different time levels.The radiation intensity,irradiation time,other environmental factors and heat storage characteristics of heat collectors all have certain influences on the temperature rise of heat air flow.The heat capacity and conductivity of stone heat storage materials have great influences on the average temperature and heat capacity of heat storage layer.The daily and nightly variations of the average temperature of heat collector are relatively small with large heat capacity,and it is in favour of adjusting the peak and valley difference of the solar chimney power generation systems.By adopting the same kind of stone as the heat collector and storage materials,the size and porosity of stone materials should be rationaly chosen.The proper particle size and porosity can enhance the heat capacity of heat storage layer so as to improve the average temperature of heat storage layer.The heat stored in the heat storage layer can better heat the air flow under no solar radiation.

关 键 词：太阳能烟囱 集热棚 蓄热层 热气流 

分 类 号：TM615[电气工程—电力系统及自动化]