Distribution of Composite Insulation and Thermal Parameters of Steam Pipelines
The use of technologically advanced and economically applicable materials and insulation struc-tures,as well as the study of the influence of thermal parameters on the steam quality of steam pipelines,is an important link in achieving efficient heavy oil extraction.This article focuses on solving the momen-tum equation and energy equation for the hard structure in composite insulation,establishing a thermal parameter calculation model for steam pipelines,and solving the thermal parameters such as steam dry-ness,temperature,and enthalpy along the way.The results show that compared to the original insula-tion,the composite insulation structure increases the pipeline dryness by 3.3%per kilometer and the en-thalpy value by 50 kJ/kg;Increasing the steam flow rate in the steam pipeline can reduce the enthalpy drop along the way and improve the end steam dryness.When the steam flow rate is 16 t/h,the dryness decreases to 3%and the enthalpy drops by 38 kJ/kg.Compared to when the steam flow rate is 8 t/h,the dryness increases by 2.5%and the enthalpy value increases by 39 kJ/kg.The enthalpy value at the steam inlet of the steam transmission pipeline decreases with the increase of boiler pressure.Reducing the pressure of the steam transmission pipeline at the outlet of the boiler can increase the enthalpy value and increase the end steam dryness.The dryness decreases to 2%at 7 MPa and 4%at 14 MPa.
heavy oil heat productionstream pipelinescomposite insulationdrynessenthalpy
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