海带太阳能辅热耦合干燥系统的设计与试验

Design and test of solar-thermal coupled drying system for kelp

为降低海带干燥耗能,提高干燥品质和干燥系统作业效率,基于热力学、传热学进行了建模和研究,设计了以阳光大棚为主体,空气热泵、集热板为热源的海带太阳能辅热耦合干燥系统。通过触摸屏设定干燥温度、时间,进行海带干燥,同时使用温度、湿度和光照度传感器测量,对记录数据进行分析。该干燥系统能够回收烘干过程中排放的余热,对余热进行排湿,再循环加热利用;太阳能集热器将热能存储在水箱,可用于辅助干燥,节约能源。结果显示:在大气最高温度27. 5℃、含水率90%左右、鲜海带质量60. 32 kg、干燥时间10 h的条件下,可得干海带含水率在14. 5%,质量6. 9 kg,电量最低为3. 91 (k W·h)/kg,新型海带干燥系统效果良好。本研究为大型藻类干燥系统提供了新的技术方法,该技术适合在中大型企业的大型藻类干燥中推广。

In order to reduce the energy consumption of kelp drying,improve the drying quality and the efficiency of the drying system,modeling and research were carried out based on thermodynamics and heat transfer theory,and solar-thermal coupled drying system for kelp with sunlight greenhouse as the main body,air heat pump and heat collecting plate as heat source was designed.Drying temperature and time were set through the touch screen for kelp drying,temperature sensor,humidity sensor and light sensor were used for measurement,and data was recorded for analysis.The drying system could recover the residual heat discharged during the drying process,dehumidify the residual heat,and then repeatedly use the heat;the solar thermal collector stored the heat energy in the water tank for secondary drying to save energy.The results showed that when the maximum air temperature was 27.5℃,the moisture content was about 90%,the weight of fresh kelp was 60.32 kg and the drying time was 10 h,the new kelp drying system had a good effect if the moisture content of dry kelp was 14.5%,the weight of dry kelp was 6.9 kg and the lowest quantity of electricity was 3.91(kW·h)/kg.The research has provided a new technical method for the large algae drying,and the technology is suitable for promotion in large algae drying of medium and large enterprises.