Exergy Analysis and Thermal Optimization of a Double-Turbine Regeneration System in a Ultra-Supercritical Double-Reheat Unit  

作　　者：Shidan Chi Tao Luan Yan Liang Xundong Hu Yan Gao 

机构地区：[1]School of Energy and Power Engineering,Shandong University,Jinan,250061,China [2]Shandong Electric Power Engineering Consulting Institute Co.,Ltd.,Jinan,250061,China [3]School of Thermal Engineering,Shandong Jianzhu University,Jinan,250061,China

出　　处：《Fluid Dynamics & Materials Processing》2021年第1期71-80,共10页流体力学与材料加工（英文）

基　　金：the Shandong Electric Power Engineering Consulting Institute science and technology project(Grant No.37-K2014-33).

摘　　要：Improving the primary steam parameters is one of the most direct ways to improve the cycle efficiency of a powergeneration system. In the present study, the typical problem connected to the excessively high superheat degree ofextraction steam in an ultra-supercritical (USC) double-reheat unit is considered. Using a 1000 MW power plantas an example, two systems (case 1 and case 2) are proposed, both working in combination with a regenerativesteam turbine. The thermal performances of these two systems are compared with that of the original systemthrough a heat balance method and an exergy balance strategy. The results reveal that the two coupled systemscan significantly reduce the superheat degree of extraction steam, turbine heat rate, and coal consumption of theunit and improve the energy utilization efficiency. These results will provide useful theoretical guidance to futureinvestigators wishing to address the general problem relating to energy conservation and modelling of the coupledextraction steam regenerative system of USC double-reheat units.

关 键 词：Ultra-supercritical unit exergy loss thermal performance regenerative steam turbine superheat degree 

分 类 号：G63[文化科学—教育学]