摘要
对较长的加热蒸汽管道,若蒸汽流速过高,则压降过大,蒸汽饱和温度会下降过多,较难满足生产工艺的加热要求。该文在考虑蒸汽密度变化的基础上、建立了确定最优蒸汽流速和保温层厚度的模型,其目标函数为管道的年度总费用,它考虑了摩擦压降、散热温降、管道和保温材料折旧和维修等费用。实例计算表明,低压蒸汽的最优蒸汽流速在公称直径为 0.10~0.20 m时仅为15~25 m/s ,在公称直径大 于0.20 m时为25~35 m/s。设计和计算时需考虑蒸汽密度的变化。
A long distance heating steam pipeline might have a larger pressure drop than expected, if the steam velocity is higher than optimal one. The decrease of saturated temperature of the steam will be more severe than expected. The model to determine optimal steam velocity and insulation thickness were proposed. The objective function of the model were annual total cost, that consists of the costs of heat exchanger surface increasing owing to pressure drop, the costs of steam mass flow raising due to thermal loss; depreciation and maintenance costs of pipeline. Case study showed that the optimal velocity of low pressure steam was about 15~25 m/s when diameter were 0.1m^0.2m, and about 25~35 m/s when diameter were larger than 0.2m .The variation of steam density due to large pressure drop should be taken into account.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2003年第1期150-154,共5页
Proceedings of the CSEE
基金
国家重点基础研究发展规划项目(G2000026308)。~
