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在高炉渣干式粒化余热回收装置的基础上,提出了高炉渣余热驱动的空气布雷顿循环装置,建立了该循环的有限时间热力学模型,对该装置的余热回收性能进行了研究。通过数值计算,分析了压气机压比、压气机进口相对压降(工质质量流率)和余热回收温度对循环功率、热回收效率和循环热效率的影响。结果表明:通过调整压气机进口相对压降和压气机压比,能使热回收效率和循环功率取得最大值;余热回收温度越高,循环功率、热回收效率和循环热效率也越高,同时,压气机进口相对压降的适用范围也越大。并以循环功率最大为目标,优化了压气机压比和压气机进口相对压降,得到了最大循环功率为51.46kW,最大热回收效率为11.98%,对应的循环热效率为20.71%。
Based on the blast furnace slag dry granulated waste heat recovery unit, the air Brayton circulation unit driven by residual heat of blast furnace slag is proposed. The finite-time thermodynamic model of the cycle is established and the waste heat recovery performance of the unit is studied. The effects of compressor pressure ratio, relative pressure drop at compressor inlet (working fluid mass flow rate) and waste heat recovery temperature on cycle power, heat recovery efficiency and cycle thermal efficiency were analyzed by numerical calculation. The results show that the heat recovery efficiency and circulating power can be maximized by adjusting the relative pressure drop at the inlet of the compressor and the pressure ratio of the compressor. The higher the heat recovery temperature, the higher the cycle power, the heat recovery efficiency and the cycle thermal efficiency. At the same time, Compressor imports relative pressure drop the greater the scope of application. The maximum cycle power was 51.46kW, the maximum heat recovery efficiency was 11.98%, and the corresponding cycle heat efficiency was 20.71%, with the goal of maximizing the circulating power and optimizing the compressor pressure ratio and the relative pressure drop of the compressor inlet.