Thermodynamics analysis and optimization of a double reheat steam system in an ultra supercritical unit
As the ultra supercritical power generation technology develops fast,the further improvement of double reheat to thermal performance appears gradually.In this paper,the optimization of thermal system design and thermodynamics analysis research about the ultra supercritical double reheat units is carried out.To begin with,the system following the traditional 8 extractions regenerative system is put forward; besides,the regenerative system setting with two additional extractions is presented; after thermodynamics analysis of various systems,the quantitative energy saving effect of main optimization measure is given at last.The study shows that: As for ultra supercritical double reheat units,setting with two additional extractions is helpful to optimize the distribution of water enthalpy rise in the regenerative system; this measure is conducive to improving the unit efficiency and decreasing the coal consumption rate.Based on these studies,this paper makes research on exergy analysis of Base Case,Case1 and Case2.Then,the regenerative system setting with the outside steam cooler is presented.Setting with outside steam cooler can obviously decrease the superheat degree of extractions,leading to the reduction of exergy loss of regenerative system.The results of the case study prove that: The coal consumption rate of the double reheat unit with 8 extractions is reduced by10.2 g/kWh,compared to Base Case.The energy saving effect is obvious.The total exergy loss of regenerative system with 10 extractions is reduced about 10%.Setting with outside steam cooler,the total exergy loss of regenerative system can still reduce.The research of this paper may provide a theoretical basis for performance evaluation and design optimization of ultra-supercritical double reheat units.
Double Reheat Units Regenerative System Thermodynamics Analysis Optimization Exergy Loss
Gang Xu Luyao Zhou Yongping Yang Yaxiong Fang Yuanyuan Li
North China Electric Power University,Beijing,China
国际会议
桂林
英文
1-17
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）