中国电机工程学报2026，Vol.46Issue(8)：3322-3333,中插21,13.DOI:10.13334/j.0258-8013.pcsee.242515
基于Modelica的300MW亚临界燃煤机组0号高加动静态特性及能效分析
The Dynamic and Static Characteristics and Energy Efficiency Analysis of the No.0 High-pressure Heater for a 300 MW Subcritical Coal-fired Power Unit Based on Modelica
摘要
Abstract
To enhance the deep peak-regulation capability of coal-fired power units and improve the thermal economy under low-load operation,this paper establishes a dynamic coupled model of the flue-gas and water-steam systems of a 300 MW subcritical boiler-turbine unit on the Dymola platform based on the Modelica language.The model is used to quantitatively evaluate the effects of installing a No.0 high-pressure feedwater heater(HPH)on the unit's fast frequency-regulation response,thermal efficiency,and low-load denitrification performance.Results show that under the turbine heat acceptance(THA)conditions of 75%and 50%,rapid cut-off of the No.0 HPH can increase the unit output by 9.8 and 5.3 MW,respectively,significantly enhancing the auxiliary frequency-regulation capability.Under steady operation with the No.0 HPH in service,the main feedwater temperature increases by 33.46 and 26.75℃,while the turbine heat consumption rate decreases by 99 and 80 kJ/(kW·h),respectively.Meanwhile,the operation of the No.0 HPH significantly raises the flue-gas temperature at the economizer outlet under various load conditions,which helps maintain the selective catalytic reduction(SCR)reactor within an appropriate operating temperature range.Further analysis at the 75%THA condition indicates that the total exergy destruction of the system decreases from 37.07 MW to 35.79 MW when the No.0 HPH is in service,while the exergy efficiency of the turbine and each regenerative heater stage is correspondingly improved.These results indicate that installing a No.0 HPH provides additional operational flexibility for both enhanced frequency-regulation capability and improved energy efficiency,offering a practical approach for optimizing deep peak-regulation operation of coal-fired power units.关键词
燃煤机组/建模与仿真/深度调峰/0号高压加热器/热经济性/㶲效率Key words
coal-fired power plants/modeling and simulation/deep peak shaving/No.0 high-pressure heater/thermal economy/exergy efficiency分类
能源科技引用本文复制引用
颜婉玲,陈刚,郭萌萌,孙立..基于Modelica的300MW亚临界燃煤机组0号高加动静态特性及能效分析[J].中国电机工程学报,2026,46(8):3322-3333,中插21,13.基金项目
国家自然科学基金(面上项目)(52276003).Project Supported by National Natural Science Foundation of China(General Program)(52276003). （面上项目）
