Author(s): ZHANG Ze-long, CHEN Lin-gen, YANG Bo, GE Yan-lin, SUN Feng-rui, Institute of Thermal Science and Power Engineering, Naval University of Engineering, Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, College of Power Engineering, Naval University of Engineering
Pages: 16-21
Year: 2015 Issue:  11
Journal: China Metallurgy
Keyword:  BF slag; air Brayton cycle; waste heat recovery; finite time thermodynamic; power; heat recovery efficiency;
Abstract: Based on dry slag granulation and heat recovery system of BF(blast furnace)slag,an air Brayton cycle driven by waste heat of BF slag is proposed.A finite time thermodynamic(FTT)model of this cycle is established and its heat recovery performance is studied.The effects of the compressor pressure ratio,the compressor inlet relative pressure drop and the heat recovery temperature on the power,the heat recovery efficiency and the thermal efficiency of the cycle are analyzed by numerical examples.It is found that the maximum power and heat recovery efficiency can be reached by adjusting the compressor pressure ratio and the compressor inlet relative pressure drop;The higher heat recovery temperature,the larger the power,the heat recovery efficiency and the thermal efficiency,and also the larger the permissible range of compressor pressure ratio and the compressor inlet relative drop.Moreover,by taking power as objective,the compressor pressure ratio and the compressor inlet relative pressure drop are optimized.Result shows that the maximum power is 51.46 kW,the maximum heat recovery efficiency is 11.98%and the corresponding thermal efficiency is 20.70%.