摘要
管网热量输运动态特性的研究是实现电、热协调调度的基础,对解决可再生能源消纳难题具有十分重要的意义。然而传统的有限容积数值解法迭代过程复杂,难以在系统层面上对管网内的热量输运过程进行整体分析。本文针对管内流体热量输运的动态过程,根据流体微元的对流换热微分方程,提出向量化的求解方法。该方法采用矩阵表达式,在不包含各个中间节点温度的前提下,得到任意时刻下,待研究节点温度关于边界温度、初始温度的代数式。以管长为1 km的管道为例,采用向量化解法,求得管网出口温度随进口水温、漏热系数变化的曲线,且与有限容积法相比计算误差在1%内。数值计算结果表明本文提出的向量化解法能够适用于管网内热量输运过程的整体性能分析和优化。
The heat transportation characteristics,which is the basis for the integrated thermal and power systems operation,play important roles in solving renewable energy sources accommodation problems.However,the complex iterations of the traditional FVMs(the finite volume methods)make it difficult to analyze the heat transportation characteristics for the district heating networks from an overall aspect.Based on the energy conservation differential equations,this paper proposed a vectorization method to provide outlet temperature matrix functions of the initial and the inlet temperature without introducing any intermediate parameters.For a heating pipe with length of 1 km,applying this model offers the temperature variations with the time and the heat loss coefficient,respectively.Results show that the outlet temperature experiences three periods with the time and it decreases with the rising heat loss coefficient.The differences between the vectorization method and FVMs are less than 1%,which verifies the accuracy and feasibility of the new method.
作者
郝玲
徐飞
葛维春
魏名山
罗桓桓
陈群
HAO Ling;XU Fei;GE Wei-Chun;WEI Ming-Shan;LUO Huan-Huan;CHEN Qun(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;State Key Lab of Power Systems,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;State Grid Liaoning Electric Power Supply CO.LTD.,Shenyang 110004,China;Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2019年第9期2131-2136,共6页
Journal of Engineering Thermophysics
基金
国家重点研发计划资助项目(No.2017YFB0902100)
关键词
管网热量输运动态特性
可再生能源消纳
向量化方法
heat transportation dynamic characteristics
renewable energy sources accommodation
vectorization method
