摘要
长输蒸汽管网散热主要包含管道表面散热和支架散热2方面,支架散热损失在管网散热中占比15%~30%,降低支架热损失可以有效提高能源利用率。建立了1个包括混凝土支墩在内的管道支架三维传热数值模型,通过实验验证了模型的准确性。模拟了不同蒸汽温度下非隔热支架和常规隔热支架的散热量变化,并从结构和材料2方面对常规隔热支架进行了改进。研究表明,常规隔热支架的散热量比非隔热支架少37.2%~55.3%。基于常规隔热支架结构,通过调整肋板高度、管夹厚度和硬质保温层,提高了支架的保温性能,散热量降低28.7%。通过对支架的保温材料研究显示,单独替换硬质保温材料散热量降低29.1%~30.9%,同时替换硬、软质保温材料,散热量降低34.9%。经过结构和材料改进的隔热支架,比常规隔热支架散热量降低49.4%,比非隔热支架散热量降低71.4%,节能效果显著。
The heat dissipation of long-distance steam pipeline network mainly includes two aspects:sur-face heat dissipation of pipelines and heat dissipation of supports.The heat dissipation loss of supports accounts for 15%—30%of the heat dissipation in the pipeline network.Reducing the heat loss of sup-ports can effectively improve energy utilization efficiency.A three-dimensional heat transfer numerical model of the pipe support including concrete piers was established,and the accuracy of the model was verified through experiments.The changes of heat dissipation of the non-insulated support and the con-ventional insulated support under different steam temperatures were simulated,and the conventional insu-lated support was improved from both the structure and material aspects.Research shows that convention-al insulated support dissipates 37.2%—55.3%less heat than non-insulated support.Based on the con-ventional heat insulation support structure,by adjusting the rib height,pipe clamp thickness and hard in-sulation layer,the thermal insulation performance of the support is improved,and the heat dissipation is reduced by 28.7%.Research on the insulation materials of the support shows that the heat dissipation is reduced by 29.1%—30.9%when the hard insulation material is replaced alone,and the heat dissipation is reduced by 34.9%when hard and soft insulation materials are replaced simultaneously.The heat-insu-lating support with improved structure and materials can dissipate 49.4%less heat than conventional heat-insulating support and 71.4%less than non-insulated support.The energy-saving effect is signifi-cant.
作者
何海军
王乃继
赵静
霍达
HE Haijun;WANG Naiji;ZHAO Jing;HUO Da(China Coal Research Institute,Beijing 100013,China;China Coal Technology&Engineering Group Clean Energy Corporation Ltd.,Beijing 100013,China;Beijing Tiandi Rongchuang Technology Co.,Ltd.,Beijing 100013,China)
出处
《化学工业与工程》
北大核心
2025年第3期173-182,共10页
Chemical Industry and Engineering
基金
中煤科工集团有限公司重点项目(2024-ZD006)
中煤科工清洁能源股份有限公司技术创新基金项目(CE-KY-JC-2023-02)。
关键词
管道支架
传热
隔热性能
数值模拟
改进研究
steam pipe support
heat transfer
insulation performance
numerical simulation
improvement research
