Design and exergy analysis of 1000-MW double-reheat double-turbine regeneration system

4th International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Zhang, Sirui^1 ; Li, Jingtao^1

School of Energy, Power and Mechanical Engineering, North China Electric Power University, China^1

关键词: Coal consumption;    Design condition;    Energy-saving effect;    Exergy efficiencies;    Off design condition;    Power generation efficiency;    Regeneration system;    Thermal equilibriums;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/237/6/062005/pdf
DOI  :  10.1088/1755-1315/237/6/062005

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The development of ultra-supercritical double-reheat technology is a practical choice to further improve the power generation efficiency, reduce coal consumption, reduce carbon emissions, and save resources. Currently, the outer-steam cooler system in double-reheat units has been typically adopted to solve the problem of prodigious superheat degree of an extraction steam. An increasing number of studies show that the double-turbine regeneration system achieves better economy and practicability in resolving the prodigious superheat degree of an extraction steam for double reheat. Through the thermal equilibrium analysis method and exergy analysis method, the performance of the three units under design conditions and off-design conditions is specifically analyzed, and the exergy loss and exergy efficiency of both the steam turbine and regenerative heater are further analyzed. The results show that the energy-saving performance of the double-turbine regeneration system is better than that of the outer-steam cooler system under the design conditions, and the energy-saving performance of the double-turbine regeneration system gradually decreases as the load decreases. At low loads, the performance of the regenerative turbine is significantly reduced, and the energy-saving effect of the double-turbine regeneration system is not as good as that of an outer-steam cooler system.