Exergy analysis of the turbine system in a 1000 MW double reheat ultra-supercritical power plant

This study aims to achieve exergy distribution in a turbine system for a 1000 MW double reheat ultra-supercritical power plant. An exergy balance equation is used to identify the real points of energy loss in the turbine system, which can provide a reference for optimizing operation and conserving energy. Results show that irreversibilities yield the highest exergy loss in the turbine, particularly in the very high pressure (VHP) and low pressure (LP) cylinders. Compared with that in the turbine of a single reheat unit, exergy loss in the studied turbine is higher and exergy efficiency is lower. For the regenerative system, exergy loss is lower and exergy efficiency is higher in the double reheat unit than in the single reheat unit. Thus, the layout of the regenerative heaters in the double reheat unit is more reasonable. However, exergy loss in high pressure regenerative heater Nos. 3 and 6 and low pressure regenerative heater Nos. 7 and 10 in the heat recovery system is extraordinary because of different reasons. Exergy loss in the condenser of the double reheat unit is relatively smaller than that in the condenser of the single reheat unit.

[1]  J Liu.  A METHOD FOR ANALYSIS THE ECONOMICS OF A THERMAL SYSTEM IN A SUPERCRITICAL PRESSURE POWER UNIT WITH DOUBLE REHEAT CYCLES , 2004 .

[2]  A. M. Al Taweel,et al.  Simulation of combined cycle power plants using the ASPEN PLUS shell , 1995 .

[3]  Sven Kjaer,et al.  A Modified Double Reheat Cycle , 2010 .

[4]  Antonio G. Ramos,et al.  Novel application for exergy and thermoeconomic analysis of processes simulated with Aspen Plus , 2011 .

[5]  Isam H. Aljundi,et al.  Energy and exergy analysis of a steam power plant in Jordan , 2009 .

[6]  A. M. Al Taweel,et al.  Thermodynamic simulation and evaluation of a steam CHP plant using ASPEN Plus , 1996 .

[7]  Qi Li,et al.  Research on the elliptic aerodynamic field in a 1000 MW dual circle tangential firing single furnace ultra supercritical boiler , 2012 .

[8]  Mahmoud Bourouis,et al.  Modelling and testing the performance of a commercial ammonia/water absorption chiller using Aspen-Plus platform , 2015 .

[9]  C. Zheng,et al.  Simulation Study of an 800 MWe Oxy-combustion Pulverized-Coal-Fired Power Plant , 2011 .

[10]  S. C. Kaushik,et al.  Energy and exergy analysis of a super critical thermal power plant at various load conditions under constant and pure sliding pressure operation , 2014 .

[11]  Yan Wei-pin.  Analysis of the Design of a Thermal System for a 1350MW Secondary Reheat Power Generator Unit , 2014 .

[12]  Amornvadee Veawab,et al.  Exergy Analysis of Ultra Super-critical Power Plant☆ , 2013 .

[13]  Rudolph Blum,et al.  High-efficiency coal-fired power plants development and perspectives , 2006 .

[14]  Cheng Xu,et al.  Optimum superheat utilization of extraction steam in double reheat ultra-supercritical power plants , 2015 .

[15]  Maroun Nemer,et al.  Performance assessment of first generation oxy-coal power plants through an exergy-based process integration methodology , 2014 .

[16]  Gu Yaxi.  Thermal Economic Analysis of a Double Reheat Ultra Supercritical Pressure Unit , 2013 .

[17]  Chuguang Zheng,et al.  Optimization and control for CO2 compression and purification unit in oxy-combustion power plants , 2015 .

[18]  Yongping Yang,et al.  Exergoeconomic Evaluation of a Modern Ultra-Supercritical Power Plant , 2012 .

[19]  Yang Wang,et al.  Component and process based exergy evaluation of a 600MW coal-fired power plant , 2014 .

[20]  Harun Gökgedik,et al.  Improvement potential of a real geothermal power plant using advanced exergy analysis , 2016 .

[21]  Mehmet Kopac,et al.  Effect of ambient temperature on the efficiency of the regenerative and reheat Çatalağzı power plant in Turkey , 2007 .

[22]  Tatiana Morosuk,et al.  Advanced Thermodynamic Analysis and Evaluation of a Supercritical Power Plant , 2012 .

[23]  Reinerus Louwrentius Cornelissen,et al.  Thermodynamics and sustainable development; the use of exergy analysis and the reduction of irreversibility , 1997 .

[24]  Yu Chen,et al.  Exergy analysis of a thermal power plant using a modeling approach , 2012, Clean Technologies and Environmental Policy.

[25]  Gang Xu,et al.  Thermodynamic analysis and optimization of a double reheat system in an ultra-supercritical power plant , 2014 .

[26]  S. Chan,et al.  Energy and exergy analysis of simple solid-oxide fuel-cell power systems , 2002 .

[27]  Gang Xu,et al.  Comprehensive exergy-based evaluation and parametric study of a coal-fired ultra-supercritical power plant , 2013 .

[28]  Mohammad Mehdi Rashidi,et al.  Thermodynamic Analysis of a Steam Power Plant with Double Reheat and Feed Water Heaters , 2014 .