摘要
目的解决小尺度污物引起的污垢问题,实验研究液固循环流化床污水换热器的流动特性与防、除垢特性,探讨循环流化床换热器技术在污水源热泵系统中应用的可行性.方法搭建单管式液固循环流化床换热器实验系统,进行液固循环流化床换热器流动特性测试、两种流速下传热系数测试与三种工况的固体粒子防、除垢性能实验.结果液固循环流化床换热器加入粒子后,管段压降增大;无粒子工况下传热系数随运行时间逐渐下降;在循环流速为1.5~2.0 m/s内,加入3%直径为2.5 mm的钢球与加入3%直径为2~3 mm的沙粒均有效抑制了污垢增长.结论液固循环流化床换热器的压降大于常规换热器的压降;仅采用提高流速的方法无法完全防止污垢生成;液固循环流化床换热器有着明显的强化换热功效,可以有效抑制污垢的增长并实现在线清洗.
To solve high thermal resistance resulted by fouling in heat exchanger restricts the application of sewage source heat pump(SSHP),this paper applies solid-liquid fluidized bed technique for fouling prevention and removing of SSHP system.An experimental apparatus of the solid-liquid cycling fluidized bed heat-exchanger with testing and analyzing system was built and the pressure drop and heat transfer coefficient of urban sewage under different operating conditions are analyzed by this system.The pressure dr...
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2011年第2期331-334,345,共5页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家十一五科技支撑计划项目(2006BAJ03B01-01)
关键词
污垢
液固循环流化床
在线清洗
强化换热
fouling
solid-liquid fluidized bed
on-line cleaning
heat transfer enhancement
