摘要
在考虑蒸汽密度变化的基础上建立了确定最佳蒸汽流速和保温层厚度的模型 ,其目标函数为考虑了摩擦压降、散热温降、管道和保温材料折旧和维修等费用的管道的年度总费用。与此同时 ,开发了考虑蒸汽密度变化的相应求解软件。实例计算结果表明 ,存在最佳的蒸汽流速 ,其随压力升高、密度增大而减小。在目前的经济条件下 ,中压蒸汽最佳流速仅为 (10～ 2 0 )m/s。若管道较长 。
On the basis of considering steam density variation, a model of optimal steam velocity and thickness of thermal insulation layer has been established. The target function of the model is the annual overall cost of the pipeline, including pressure reduction due to friction, temperature drop due to heat dissipation, depreciation charge of the pipeline proper and thermal insulation materials, as well as expenses of mainlenance etc. At the same time, corresponding solution-finding software has been developed by considering variation of steam density. The practical calculation results show, there is an optimal steam velocity, which is decreasing along with pressure-and density-increasing. Under Present economic conditions, the optimal flow velocity of medium-pressure steam is only 10～20 m/s. If the pipeline is much longer, it is necessary to consider the variation of steam density during the time of design and calculation.
出处
《热力发电》
CAS
北大核心
2003年第4期9-12,共4页
Thermal Power Generation
基金
国家重点基础研究发展规划资助项目 (G2 0 0 0 0 2 630 8)
