Analysis of transmission characteristics of steam long-distance heating pipeline

In order to study the changes of steam state parameters and the interaction between hydraulic calculation and thermal calculation during the long-distance heating of steam, a variety of working conditions were simulated by the compressible fluid pipe network analysis software AFT arrow combined with the control variable method. The results show: The steam outlet pressure obtained by traditional calculation methods is lower than the outlet pressure when considering the change of steam state parameters. The density change of steam is related to the flow velocity and pipe diameter of steam. When the maximum flow rate of steam in a long straight pipe is 20 m/s, the temperature drop of steam per kilometer gradually decreases. When the maximum steam flow rate is 40 m/s, 60 m/s, the temperature drop of steam per kilometer decreases first and then increases. This shows, there is still a certain error between the traditional method of calculating steam pressure drop and the actual, especially for small pipe diameters, heating pipes where the flow rate of steam changes greatly during the heating process, heating pipes where the flow rate of steam changes greatly during the heating process.