电加热式干燥机热量回收温差发电装置设计与性能分析  

Design and performance analysis of the thermoelectric power generation device for the heat recovery of electric heating dryer

作　　者：王立舒[1] 何源 房俊龙[1] 张天翼 姜灏桢 白龙 Wang Lishu;He Yuan;Fang Junlong;Zhang Tianyi;Jiang Haozhen;Bai Long(Institute of Electrical and Information,Northeast Agricultural University,Harbin 150030,China;School of Physics and Electronic Engineering,Mudanjiang Normal University,Mudanjiang 157011,China)

机构地区：[1]东北农业大学电气与信息学院,哈尔滨150030 [2]牡丹江师范学院物理与电子工程学院,牡丹江157011

出　　处：《农业工程学报》2022年第15期249-258,共10页Transactions of the Chinese Society of Agricultural Engineering

基　　金：黑龙江省教育厅科技课题(12521038);黑龙江省教育厅基本科研业务费支持项目(1353MSYYB015);牡丹江师范学院青年学术骨干项目(GG2018004)。

摘　　要：干燥是很多行业生产流程中的必要环节。目前,干燥机加热箱、风道的主要材料为钢板,工作时热量散失多。传统方法是在钢板内层或外层铺设保温材料,这种方法存在只能延缓热量散失,无法回收热量的问题。针对该问题,该研究提出了通过温差电池(Thermoelectric Generator,TEG)回收干燥机热量的节能模式,设计研发了安装在干燥机上回收热量的温差发电系统。使用Fluent软件对安装TEG前后的干燥机进行温度场仿真,并结合实测结果评估安装TEG对干燥机运行的影响。进一步搭建干燥机温差发电试验平台,测试发电系统的参数特性,试验结果表明安装TEG对干燥机功效影响不明显。当加热功率3.0 kW,风速12 m/s时,对应的最优水流量为22.3 L/min,此时水泵消耗功率约6.4 W,系统输出功率31.8 W,净输出功率最高达到25.40 W,热电转换效率为3.90%,该研究为干燥节能技术提供了新思路。Electric heating drying system has been widely used for structural drying,sanitizing with heat,and space heating at present.The metal steel plate can often be the main material of the heating box and air duct of the dryer in the mechanical arrangement.Nevertheless,a large heat transfer coefficient can make it easy to lose heat,when converting the electric current to the heat in the system.The insulation material can normally be laid on the outer layer of the steel plate.However,the traditional configuration cannot recover the heat,although the heat loss can be prevented in this case.Alternatively,thermoelectric power generation has attracted extensive attention in the field of heat recovery,because it can directly convert temperature differences into electricity.In this study,an energy-saving mode was proposed to recover the heat of the dryer using a Thermoelectric Generator(TEG).A thermoelectric power generation system was designed and developed for the dryer to directly recover the heat.In addition to recovering the heat of the metal wall of the dryer,the thermoelectric cell was also used to recover the part of the heat of the hot air,resulting in a decrease in the hot air temperature.Therefore,the Fluent software was firstly used to simulate the temperature field of the dryer before and after the installation of TEG.The measured parameters were combined to evaluate the impact of TEG installation on the dryer.Secondly,the output electric energy was controlled to obtain stable electricity in the thermoelectric power generation device.The reason was that the cold end,hot end,and power generation performance of TEG fluctuated dynamically,due to the heating power.The STM32F334 was used as the controller to realize the DC-DC conversion function.The test was also carried out to verify the performance of raising and lowering the voltage of the controller.As such,the battery was charged to fully meet the requirements of the TEG for the heat recovery of the dryer.Finally,the test platform of TEG was built for the heat r

关 键 词：干燥 温差 发电 计算流体力学 热量回收 

分 类 号：TM913[电气工程—电力电子与电力传动]