摘要
针对目前蒸汽管网水力计算中忽略水力、热力工况相互影响导致计算结果误差偏大及计算方法适用范围小等问题,基于蒸汽输送过程中流动和传热特性,综合考虑蒸汽的可压缩性、状态变化、摩擦和传热等多种因素的作用,建立适用性广的水力热力耦合计算模型。采用标准四阶Runge-Kutta公式对数学模型进行求解。通过实例管网对其验证表明,耦合计算结果能够准确描述管网运行中蒸汽压力和温度的变化关系,各管段计算结果与实际运行数据的最大误差小于5%,耦合计算结果与运行数据吻合较好,精度高,可应用于实际蒸汽管网的设计计算和分析。
Currently, the hydraulic calculation for heating pipe networks ignores the interaction between thermodynamic loss and power loss, which often results in big errors and a limited range of application. We develop a hydraulic-thermal coupling calculation model, taking into account the steam flow and heat-transfer characteristics and fully considering the actions of mul- tiform factors, such as coercibility, change of state, and friction. The model is suitable for high- and low pressure steam pipe networks. The differential equation of the model is solved using the Runge-Kutta formula. Finally, taking a real steam pipe network as a case, the coupling calculation is verified to be able to accurately describe the relation between steam pressure and temperature in the operation period, and the maximum error between calculation and operating data is less than 5 0%, showing a good agreement between them. It is suggested that the proposed method can be applied in calculation and analysis of steam heating projects.
出处
《中国科技论文》
CAS
北大核心
2013年第8期812-815,共4页
China Sciencepaper
关键词
蒸汽管线
耦合
数学模型
可压缩性
黏性
steam pipelines
coupling
mathematic model
coercibility
viscosity
