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optimization of Low-Temperature Exhaust Gas Waste Heat Fueled organic rankine Cycle

Journal of Iron and Steel Research International 2012年第6期19卷 30-36页

作者： WANG Hui-tao WANG Hua ZHANG Zhu-ming Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction Ministry of Education Kunming University of Science and TechnologyKunming 650093YunnanChina Kunming Iron and Steel Company Kunming 650302YunnanChina

Low temperature exhaust gases carrying large amount of waste heat are released by steel-making process and many other industries, organic rankine cycles （ORCs） are proven to be the most promising technology to re- cover the low-temperature waste heat, thereby to get more financial benefits for these industries. The exergy analysis of ORC units driven by low-temperature exhaust gas waste heat and charged with dry and isentropic fluid was per- formed, and an intuitive approach with simple impressions was developed to calculate the performances of the ORC unit. Parameter optimization was conducted with turbine inlet temperature simplified as the variable and exergy effi- ciency or power output as the objective function by means of Penalty Function and Golden Section Searching algo- rithm based on the formulation of the optimization problem. The power generated by the optimized ORC unit can be nearly as twice as that generated by a non-optimized ORC unit. In addition, cycle parametric analysis was performed to examine the effects of thermodynamic parameters on the cycle performances such as thermal efficiency and exergy efficiency. It is proven that performance of ORC unit is mainly affected by the thermodynamic property of working fluid, the waste heat temperature, the pinch point temperature of the evaporator, the specific heat capacity of the heat carrier and the turbine inlet temperature under a given environment temperature.

关键词： waste heat recovery organic rankine cycles optimization working fluid exergy pinch point

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