【作者】 庞志伟；

【导师】 周洁；

【作者基本信息】 浙江大学 ， 热能工程， 2011， 硕士

【摘要】 钢铁、玻璃生产过程中产生大量的高温废气,热光伏系统作为一种新型发电方式,能够利用工业废气余热产生电能。本文对该余热型热光伏系统展开分析研究。首先,依据热光伏发电的基本原理,结合具体的工作环境,确定余热型热光伏系统的基本组件为稀土辐射器、透明导电氧化物(TCOs)滤波器、硅光伏电池。基于辐射传输方程和能量平衡方程基本理论,引入典型波长的光谱分析方法,对稀土辐射器的选择性涂层厚度进行优化分析。研究表明：稀土材料氧化镱具有良好的选择性辐射特性,适合作为辐射器涂层材料。不同的工作温度下,氧化镱涂层的最优厚度略有变化,最优涂层厚度随工作温度升高而线性增长,针对玻璃熔窑高温废气进行余热回收的热光伏系统,其工作温度在1000～1800 K之间,氧化镱涂层的最佳厚度应在L=0.2～0.23mm之间,此时系统具有最大的输出功率和发电效率。再次,对稀土辐射器光谱发射特性、TCOs滤波器滤波特性、硅光伏电池发电特性进行分析,并利用蒙特卡罗法对整个热光伏系统发电性能进行理论研究。结果表明：在碳化硅基体上涂氧化镱后,热光伏系统的热电转换效率大幅度提高；TCOs滤波器对提高系统效率也作用明显,但其滤波性能仍有较大的改善空间。该余热型热光伏系统在T=1600 K工作温度下,理论上发电功率可达1.4 kW/m2,热电转换效率可达16.6%。热光伏发电模型试验证明了热光伏发电的可行性,实现能量由热能到辐射能再到电能的全过程。最后对余热型热光伏系统的经济性及工业应用进行了分析,经计算其投资成本在14500￥/kW左右,发电成本为0.21￥/kw.h,具有较好的经济性；由于热光伏系统可使电池板的冷却系统与玻璃窑炉的空气余热环节结合起来,能源利用率高达64%,达到了节能降耗效果,有较好的应用前景。更多还原

【Abstract】 As a novel way to generate power, Thermophotovoltaic (TPV) utilizes the high-temperature exhaust gas produced in manufacture processes of steel and glass. This paper analyzes and researches TPV system used for waste heat recovery.On the basis of fundamental and specific environment, we choose rare-earth emitter, TCOs filter and Si photovoltaic cell as the main components of TPV system. In accordance with radiation transfer equation and energy balance equation, we introduce the typical spectral analysis to determine the optimized selective coating thickness of rare-earth emitter. Results indicate that Yb2O3 is the suitable material for coating due to its selective radiation characteristic. The optimized thickness has a linear relationship with the temperature of emitter. Working temperature of TPV system applied to recover waste heat of exhaust gas from glass kiln ranges between 1000-1800 K at which the optimized thickness L of Yb2O3 is 0.20-0.23 mm. Under this condition, the maximum of output power and generating efficiency could be achieved.Then we analyze the emission spectral of rare-earth emitter filtering performance of TCOs filter as well as generating characteristics of Si cell, and use Monte Carlo Method to study the generating performance of total system. Results show that TPV system with Yb2O3 coated on the SiC substrate has a significant improve in efficiency. Meanwhile, TCOs filter makes the similar effect and still has a huge potential for efficiency improvement. This system has a generating power of 1.4 kW/m2, as well as an efficiency of 16.6% at temperature T of 1600 K. TPV used for generating is proved to be feasible in the experiment, which converts heat into radiation energy, and electrical energy finally.Lastly, we analyze the economy and industrial application of TPV system used for waste heat recovery. When the investment is around 14500￥/kW, the cost for generating is 0.21￥/kw.h. Combining cooling system of Si cell and preheating system of glass kiln makes the total energy utilization efficiency up to 66%. TPV makes a remarkable effect in energy saving and has a bright application prospect.更多还原