既有供热系统改扩建方法研究

发布时间：2018-09-09 12:15

【摘要】：随着我国城镇化的发展,使得人们对供热需求逐渐增大。而新建供热系统不仅占地面积较大致使敷设管线困难,而且投资巨大,经济回收困难。因此,对已有供热系统进行改造,成为扩大供热区域行之有效的方式。本文针对一级热网以及二级热网改造的方法进行研究,得出相应较为合适的既有管网改造方式。针对供热管网的一级网改造方法,主要研究环状供热系统应用分布式水泵系统的相关问题。首先,分析供热系统的经济性,并建立普适性的经济模型。理论分析环状供热管网各管段压力分布,应用平均比摩阻表示各管段比摩阻,基于普适性经济模型建立适用于环状管网分布式水泵系统的经济模型,并推导得到经济比摩阻计算公式。其次,研究环状管网应用分布式水泵系统特性,主要针对系统内部零压差点出现位置与数量关系。基于模型和工程案例,应用经济比摩阻计算公式,分析新建环状系统工程,验证经济比摩阻的经济性。分析既有环状系统改造工程,得出既有管网改扩建工程选择管径方法。最后,得到新建管网设计与既有管网改扩建设计的流程。根据哈尔滨某供热系统改造工程,基于既有管网改扩建设计流程,说明实际工程中环状管网应用分布式水泵系统的改造方法。针对供热管网的二级网改造方法,主要研究串联单管供热系统。首先,介绍串联单管系统,给出其定义、系统形式、以及适用于该系统的管网形式。其次,研究串联单管改造系统的限制条件,得出可扩建最大限度计算方法。理论分析系统的设计方法,包括管网的水力计算,动力设备的选取等,并对该系统区别于传统改造系统特点进行总结。最后,根据具体案例,结合供热系统经济模型,对比传统改造方式与串联单管系统改造方式的经济性,分别考虑新增热负荷区域与新增用户连接位置对系统改造经济性的影响,得到此种改造方式的特点。本文对既有供热系统改造方式进行设计研究,为实际工程提供了一定的理论基础和决策依据。
[Abstract]:With the development of urbanization in our country, people's demand for heat supply is increasing gradually. The newly-built heating system not only covers a large area, but also has huge investment and difficult economic recovery. In view of the primary network transformation method of the heating network, this paper mainly studies the related problems of the application of the distributed water pump system in the annular heating system. Firstly, it analyzes the economy of the heating system and establishes the economic model of the universality. The pressure distribution of each pipe section in the heat pipe network is expressed by the average specific friction. Based on the universal economic model, the economic model for the distributed pump system in the annular pipe network is established. The formula for calculating the economic specific friction is derived. Secondly, the characteristics of the distributed pump system in the annular pipe network are studied, mainly aiming at the zero in the system. Based on the model and engineering case, the economic specific frictional resistance formula is used to analyze the new ring system project and verify the economy of the economic specific frictional resistance. According to the renovation project of a heating system in Harbin and based on the renovation design process of the existing pipe network, the renovation method of applying distributed water pump system to the loop pipe network in the actual project is explained. The definition, system form and pipe network form of the system are given. Secondly, the restriction conditions of the series single pipe reformation system are studied, and the method of maximum extension calculation is obtained. Finally, according to the specific case, combined with the economic model of heating system, the economic efficiency of the traditional transformation mode and the series single-pipe system transformation mode is compared, and the influence of the connection location between the new heating load area and the new users on the economic efficiency of the system transformation is considered respectively, and the characteristics of this transformation mode are obtained. The way of design and research provides a theoretical basis and decision-making basis for practical projects.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU995

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