This study established a heat transfer model for a multi-layer composite insulation structure applied to steam pipelines,conducting experiments on DN200mm pipelines to investigate the impact of various insulation structures and materials on insulation performance.The model's accuracy was validated against experimental data,facilitating the determination of the optimal insulation plan under diverse operating conditions.Experimental findings indicated that the pipe surface heat flow density decreased with the addition of convective layers and airbag layers,while it gradually diminished with increased shawl thickness and overall insulation thickness.However,an increase in reflective layers initially decreased and then increased the heat flow density.The heat transfer model predictions closely aligned with experimental data,showing a deviation of less than 6％.Economic analysis advised against using convective layer as insulation material.The recommended optimal insulation solution substantially reduced the system's total heating cost.The optimal insulation thickness value increased with the increase of the medium temperature and pipe diameter.Particularly for high-temperature pipelines exceeding 400℃,adopting composite insulation structures can yield over 30％savings compared to single aluminum silicate insulation.
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