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| Comparison and Optimization of Mid-low Temperature Cogeneration Systems for Flue Gas in Iron and Steel Plants |
| ZHANG Li-hua1,WU Li-jun1,ZHANG Xiao-hong2,JU Gui-dong1 |
1. Thermal and Environmental Engineering Institute, Tongji University, Shanghai 201804,China
2. Resources and Environment Department, Shandong Water Polytechnic, Rizhao 276826, Shandong, China |
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Abstract Three generation systems, namely, steam Rankine cycle (SRC), organic Rankine cycle (ORC), and steam-organic combined Rankine cycle (S-ORC), were simulated using the Engineering Equation Solver (EES) to efficiently utilize flue gas emissions from 200 to 450 �� in iron and steel plants. Based on the simulation results for thermal efficiency, exergy efficiency, and power generation, the performances of the three power generation systems were compared and analyzed. To further utilize waste heat from the turbine exhaust steam of the ORC system, cascade ORC (CORC) was designed for heat sources above 300 ��. Based on a comprehensive performance comparison, the application of the ORC using R141b is preferable for 200 to 300 �� flue gas. For 300 to 450 �� flue gas, CORC is an alternative technology to improve the efficiency and quality of waste heat utilization. For flue gas above 450 ��, S-ORC can achieve higher efficiency and power generation than conventional SRC, with a relatively small negative pressure and high dryness of the turbine outlet steam. Hence, S-ORC can be considered as a substitute for SRC.
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Received: 27 August 2012
Published: 18 November 2013
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| Fund:Research and industrialization of integrated dust collector used in waste heat synthetic cascade utilization system in in iron and steel enterprises |
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Corresponding Authors:
Wu Li-Jun
E-mail: ljwu@tongji.edu.cn
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2013, Vol. 20 
