摘要
基于前期光滑外伴管伴热系统性能的研究,对应用导热胶泥进行伴热优化的系统,利用FLUENT软件对其传热特性与节能潜力进行了数值分析。伴管下置式系统中,优化前后均存在浮力诱导的层流自然对流。应用不同夹层模型的计算表明,优化后仍需保持空气夹层以减少热损失,但可将伴管上置而基本不影响伴热效果且易于施工。应用导热胶泥可使伴管与工艺管间的热阻降低50％以上,可得到更高的物料温度或降低伴热介质的需求温度及其(?)损失,能量利用匹配程度提高,节能潜力较为显著。
Based on previous study on performance of external bare tube heat tracing system, heat transfer characteristics and energy saving potential of the system optimized by heat-transfer cement is simulated and analyzed with software FLUENT. For the system with a single tracing tube under process pipe, laminar natural flow exists before and after optimization. Calculations with different models of closed layers reveal that it＇ s still necessary to keep the air layer from being taken up by insulation material to reduce heat loss, but the tracing tube can be placed on top for construction convenience with little influence on heat tracing efficiency. Thermal resistance between tracing tube and process pipe can be reduced by more than 50% by application of heattransfer cement, thus higher process stream temperature can be approached or the required tracing medium temperature as well as exergy loss can be reduced. Energy matching level is raised and energy saving is obvious.
出处
《炼油技术与工程》
CAS
北大核心
2007年第2期58-62,共5页
Petroleum Refinery Engineering
基金
上海市科委重大科技攻关项目(05dz12028)
关键词
蒸汽伴热
导热胶泥
优化
传热特性
动态
节能
数值计算
steam tracing, heat-transfer cement, optimization, heat transfer characteristics, dynamic, energy conservation, numerical simulation
