摘要
针对污水源热泵系统污水侧换热器结垢问题,探究含沙污水中含沙量及泥沙中值粒径对结垢的影响。搭建含沙污水源热泵污水侧防除垢实验台,在污水流速0.57、0.81、1.15 m/s,污水含沙量50、100、500、700、1200 g/m^(3),泥沙中值粒径为0.05、0.15、0.28、0.45 mm,换热管内径20 mm等特性参数下开展实验研究,并结合超声波声空化作用,探讨两者的耦合效果。研究表明:含沙污水的结垢量存在波动,0.45 mm泥沙中值粒径波动更为明显;含沙量一定的情况下,随着泥沙中值粒径的不断提高,结垢量逐渐减小,最大差值为16.1 g,传热系数相差130.49 W/(m^(2)·K);超声波有着良好的防、除垢效果,1.15 m/s流速下的防、除垢效果最好,除垢率高达84%;相比泥沙中值粒径,含沙量对声空化效果影响更为明显,含沙量的增大会抑制声空化作用,影响效果5~50 min最为剧烈,大含沙量相比小含沙量,除垢率下降4.9%。
Aiming at the problem of scale formation of heat exchanger on sewage side of sewage source heat pump system,the influence of sediment content and the median particle size of sediment in natural sewage on scale formation was studied.Build the anti-scaling test platform of the sewage side of the sand-containing sewage source heat pump.The sewage flow rate is 0.57,0.81,1.15 m/s,and the sewage sediment content is 50,100,500,700,1200 g/m^(3).The median particle size of the sediment is 0.05,0.15,0.28,0.45 mm,and the inner diameter of the heat exchange tube is 20 mm,and the coupling effect of the two is discussed in combination with ultrasonic cavitation.The results show that the scale amount of sand-containing wastewater fluctuates,and the median particle size of 0.45 mm sediment fluctuates more obviously.When the sediment content is constant,with the increase of the median particle size of the sediment,the scale amount decreases gradually,the maximum difference is 16.1 g,and the difference of heat transfer coefficient is 130.49 W(/m^(2)·K).Ultrasonic has a very good anti-scaling effect,the best anti-scaling effect at 1.15 m/s flow rate,the scaling rate is as high as 84%;Compared with the median particle size,the impact of sediment content on the acoustic cavitation effect is more obvious.The increase of sediment content will inhibit the acoustic cavitation effect,and the effect is the most severe within 5-50 min.Compared with the small sediment content,the scale removal rate decreases by 4.9%.
作者
钱剑峰
孔繁鹏
曹佳玲
徐莹
张吉礼
王海燕
Qian Jianfeng;Kong Fanpeng;Cao Jialing;Xu Ying;Zhang Jili;Wang Haiyan(School of Energy and Civil Engineering,Harbin University of Commerce,Harbin 150028,China;School of Civil&Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China;School of Architecture,Harbin Institute of Technology,Harbin 150090,China)
出处
《太阳能学报》
北大核心
2025年第4期83-90,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51208160)
黑龙江省自然科学基金联合引导项目(LH2023E028)
黑龙江省高校青年人才培养计划(UNPYSCT-2015072)。
关键词
污水
热泵系统
超声波应用
除垢
含沙量
泥沙中值粒径
换热特性
sewage
heat pump system
ultrasonic applications
descaling
sediment content
median particle size of sediment
heat transfer characteristics
