针对钢铁工业中的大量烧结烟气余热,提出一种基于热电发电技术的显热回收方案,建立了相应的计算模型,得到了烟气、冷却水、热电单元端点温度沿流动方向的分布特征,分析了烟气温度、烟气换热系数、冷却水换热系数对最优热电单元长度的影响,并分析了热电单元横截面积对电流和电压的影响.结果表明,对于350℃的烧结烟气,每平方米换热面积可以产生约1.47 kW电能,热效率约为4.5％,设备成本的回收周期在4年左右.
There are large quantity of sintering flue gas heat in iron and steel industry.A thermoelectric power generation technology-based solution recycling sensible heat is presented.The corresponding calculation model is established and the distribution characteristics of sintering flue gas,cooling water and the thermoelectric element junction temperatures along the flow direction are obtained.The effects of sintering flue gas temperature,gas heat transfer coefficient and water heat transfer coefficient on the optimal thermoelectric element length are analyzed.The effects of cross-sectional area of the thermoelectric elements on the current and voltage are also analyzed.The results show that for sintering flue gas at 350℃,about 1.47 kW electrical energy can be produced per square meter heat transfer surface area,and thermal efficiency of about 4.5％ can be achieved.The recovery period of the equipment cost is about 4 years.
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