Application of energy-saving technology in long-distance heat supply project
LIU Jian-guo
YAN Yao-feng
YANG Tong-yuan
HE Ya-jun
ZHOU Xiao-san
JIN Jiang-hao
Abstract：Taking a long-distance and large temperature difference heat supply project as an example,this paper focuses on the research of new technology applications such as large temperature difference heat pump heating technology,coating drag reduction and consumption reduction technology,smart heat network technology,insulation bracket energy-saving technology,application of new thermal insulation materials for overhead pipelines,and well-waterproofing technology.Through theoretical calculation and actual project case analysis,the long distance heat supply project case which has adopted the above energy-saving technology is compared with the project which has not adopted the energy-saving technology in the previous project.The results show that after using the new energy-saving technologies and materials mentioned above,the temperature drop of the heat pipe network with DN1 400 diameter has been reduced to 0.067℃/km at a temperature of 130 ℃/30 ℃ and a rated flow rate of 15 300 t/h,which is 67％of the temperature drop of 0.1℃/km specified in CJJ/T 185-2012 Technical Code for Energy Efficiency of City Heating System.The equivalent roughness of the pipeline is about 0.2 mm,which is 40％of the equivalent roughness of 0.5 mm specified in CJJ/T 34-2022 Design Standard for Urban Heating Network.The resistance of the heating system along the way is reduced by 20％～25％,and the total heat loss is reduced by 20％～40％.The energy-saving effect is remarkable,significantly improving the comprehensive economic benefit of the project.
Keywords：heat pump unitlarge temperature differencesmart heating networkenergy-saving and emission reductioncoating drag reductioninsulation bracket
Publication Date：2023-12-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 57-60 )