Research on the application economy of BEST small unit in 1 000 MW double reheat ultra-supercritical unit
LI Zheng
LI Zhefei
YANG Liqiang
TANG Yi
YANG Xianmin
LIU Weifeng
DONG Chaoyuan
ZHOU Yuanzhi
Abstract：Focusing on the 1 000 MW double reheat ultra-supercritical unit,the application economy of the variable speed suction back feed pump steam turbine(BEST)scheme is explored.This scheme utilizes a small steam turbine with back-pressure extraction to reduce the superheat of the regenerative extraction steam,thereby enhancing the thermal economy of the unit and the entire plant.The analysis is carried out with the Kemen PhaseⅢ project as the research object.The results show that under the conditions of a unit price of 1 171 yuan/t of standard coal and an annual utilization hour of 4 700 h,after adopting this scheme,the investment of the two units increased by 33.2 million yuan,the annual revenue increased by 23.36 million yuan,and the static payback period of investment is 1.4 a.The higher the coal price and the lower the utilization hours,the longer the static payback period of this plan will be.The BEST small unit solution is more suitable for projects with low coal prices and high utilization hours.
Keywords：BEST small unit1 000 MW double reheat ultra-supercritical uniteconomy
Publication Date：2025-10-25
Online Publishing Date：2025-11-28(First online date of this platform, not the publication date of the document)
Pages：5( 91-95 )