Research on energy-saving design of power plant boiler system based on energy cascade utilization
ZHAO Wei
JIANG Guoan
WANG Bin
LIN Baosen
ZHENG Minghong
Abstract：Aiming at the energy loss problem of the power plant boiler system,an energy-saving design scheme based on the stepwise utilization of energy is proposed.A technical path for the stepwise recovery of flue gas waste heat,multi-level optimization of feed water heating,staged utilization of steam extraction and dynamic regulation of system heat flow is constructed,and operation tests are carried out in a 350 MW unit.The results show that the coal consumption per unit of power generation has decreased from 322.47 g/kWh to 284.36 g/kWh,the thermal efficiency of the boiler has increased from 86.23%to 93.89%,and the flue gas temperature has decreased from 167.62℃to 142.71℃.The load fluctuation range has decreased from 6.47%to 3.26%,and the feed water temperature deviation has decreased from 8.26℃to 5.48℃.The operational stability has been significantly enhanced.The CO2 emission intensity has decreased from 0.942 kg/kWh to 0.843 kg/kWh,with an investment payback period of approximately 1.5 a to 2.0 a,demonstrating good economic and environmental benefits.
Keywords：power plant boilerenergy cascade utilizationwaste heat recoverymulti-stage heatingenergy-saving design
Publication Date：2025-12-25
Online Publishing Date：2026-01-26(First online date of this platform, not the publication date of the document)
Pages：4( 89-92 )