烧结烟气余热驱动圆筒式两级热电发电装置热力学分析与优化  

Thermodynamic analysis and optimization for a two-stage thermoelectric generator device with cylindrical tubes driven by sintering flue gas heat

作　　者：熊兵[1] 陈林根[1] 孟凡凯[1] 孙丰瑞[1] 

机构地区：[1]海军工程大学动力工程学院,热科学与动力工程研究室,舰船动力工程军队重点实验室,武汉430033

出　　处：《中国科学：技术科学》2016年第3期293-301,共9页Scientia Sinica(Technologica)

基　　金：国家重点基础研究发展计划(批准号:2012CB720405);国家自然科学基金(批准号:11305266,51576207)资助项目

摘　　要：针对钢铁工业中烧结烟气余热资源丰富但回收利用率低的现状,建立了烧结烟气余热驱动圆筒式两级热电发电装置的有限时间热力学模型.以最大功率输出为目标函数,应用Matlab优化工具箱优化了热电单元尺寸和工作电流,分析了烟气换热通道几何尺寸和多边形边数对优化变量和最优性能的影响,并从经济性角度计算了投资回收周期.结果表明:对于正方形截面管道,烧结烟气为350℃时,优化前功率为5.59 k W,优化后功率为7.97 k W,提高42.39%.热电模块价格为40元/块时,设备回收周期为6年左右.Focusing on the large quantity and low recovery rate of sintering flue gas heat in iron and steel industry, a finite time thermodynamic model of a two-stage thermoelectric generator device with cylindrical tubes driven by sintering flue gas heat is established. Both the length of thermoelectric elements and working electric current are optimized for the maximum power by using Matlab optimization toolbox. The effects of the geometric parameters of the pipe on the optimal variables and the invest recovery period of the device are analyzed as well. The results showed that the optimized power is 7.97 k W based on the pipe with square cross-section for sintering flue gas at 350°C, which is 42.39% improvement compared with the non-optimized power of 5.59 kW. The investment recovery period of the device is about 6 years when the price of the thermoelectric module is $40.

关 键 词：钢铁工业 烧结烟气 余热回收 两级热电发电机 经济性分析 有限时间热力学 

分 类 号：TM617[电气工程—电力系统及自动化]