Construction and analysis of the thermal cycle of the supercritical regenerative coal-fired power generation system
Regeneration is significant in improving the thermal efficiency of the Rankine cycle.However,current research on regeneration is limited to the subcritical region,and the supercritical region has not been deeply explored yet.In this study,the supercritical regenerative method is proposed for the first time,the supercritical regenerative cycle is constructed,and the advantages of the regeneration process are reflected by its high power generation efficiency.Considering a double-reheating unit as an example,this study performs a theoretical calculation and a comparative analysis with BEST turbine generation based on the first and second laws of thermodynamics.The analysis results show that supercritical regeneration can effectively improve power generation efficiency.In this paper,for the main vapor parameters of 32 MPa and 610/625/622℃,the two supercritical regenerative technologies can improve the power generation efficiency by 0.96％and 1.02％,respectively,on the basis of 47.57％power generation efficiency.Moreover,BEST turbine regeneration can increase the power generation efficiency by 0.1％.Meanwhile,BEST turbine can effectively reduce exergy loss during regeneration,while supercritical regeneration can greatly reduce boiler exergy loss.Further efficiency gains can be achieved(48.7％and 48.76％)by coupling the two methods.The supercritical regeneration process proposed in this paper breaks the bottleneck and realizes regeneration in the supercritical region.The proposed method is the next step in the further development of cycle regeneration optimization.
万方数据
维普
