煤质技术2026，Vol.41Issue(3)：17-23,7.DOI:10.3969/j.issn.1007-7677.2026.03.03
集中供热蒸汽管网系统的热效率与火用效率综合分析
Comprehensive analysis of thermal efficiency and exergy efficiency in central heating steam pipeline networks
摘要
Abstract
A scientific assessment of the energy efficiency of long-distance steam pipelines in central heating systems requires an evaluation framework that considers both the quantity and the quality of energy.This study establishes an analytical model for steam pipeline transport,coupling equations for pressure drop,temperature drop,energy bal-ance,and exergy balance,to systematically analyze the influence of key parameters—namely initial steam tempera-ture,initial pressure,mass flow rate,and insulation thickness—on thermal efficiency and exergy efficiency.The re-sults show that the two efficiency metrics respond significantly differently to these parameters.Compared to thermal ef-ficiency,exergy efficiency provides a more comprehensive reflection of the loss of energy quality due to heat dissipa-tion and flow irreversibility,exhibiting greater sensitivity to parameter variations.Specifically,an increase in the ini-tial steam temperature reduces both thermal efficiency and exergy efficiency,but the decline in exergy efficiency is more pronounced.Raising the initial pressure substantially improves exergy efficiency by significantly reducing flow ir-reversibility losses,while thermal efficiency decreases slightly due to a reduction in specific enthalpy.exergy efficien-cy exhibits a non-monotonic,initially increasing then decreasing trend with increasing steam flow rate,presenting an optimal flow point,whereas thermal efficiency increases monotonically.Increasing the insulation thickness effectively improves both thermal efficiency and exergy efficiency,with the benefit to exergy efficiency being more significant.This analysis provides a theoretical basis,integrating both the quantity and quality of energy,for the refined design and energy-efficient operation of long-distance steam heating networks.关键词
集中供热/蒸汽管网/热效率/火用效率/节能优化Key words
central heating/steam pipeline network/thermal efficiency/exergy efficiency/energy-saving optimi-zation分类
能源科技引用本文复制引用
曾鑫..集中供热蒸汽管网系统的热效率与火用效率综合分析[J].煤质技术,2026,41(3):17-23,7.基金项目
中国煤炭科工集团有限公司科技创新创业资金专项重点资助项目(2024-ZD006,2025-ZDGJ005) （2024-ZD006,2025-ZDGJ005）
