多热源集中供热系统优化设计研究

发布时间：2018-08-14 13:16

【摘要】：多热源联网技术是为节约资源、降低系统运行成本、提高经济效益,在综合运用水泵调速技术和控制技术的基础上发展起来的一项先进的热水管网运行技术。多热源枝状管网系统与传统单热源供热系统相比,其特殊点在于交汇点的存在,其位置的不同使得各个热源承担热负荷大小不同,循环泵组耗电量也不同。所以本文提出多热源枝状管网系统中寻求最优交汇点位置的方法。当交汇点位置在主管段上移动,只有跨过某分支时系统运行状态才会发生改变。因此确定交汇点最优位置是一个离散型数学问题,其寻优过程可采用“逐点法”。首先,本文分别以多热源枝状管网系统中循环水泵耗电量、热源的运行费用为优化目标函数,在设计工况下寻求最优交汇点的位置,分析这两个因素对交汇点最优位置影响的大小。同时,本文以集宁区某工程三热源枝状管网系统为研究对象,针对该系统中热源及循环泵组的具体情况,建立相应优化目标函数,并对各优化结果进行了对比分析,从而验证了本文提出的目标函数及优化方法的有效性,为多热源热水集中供热管网的优化设计提供指导。最后,本文讨论在多热源环状网系统在设计过程中的平差计算方法。在多热源环状网系统中,由于环网结构及热源位置的不同,系统中交汇点的个数和位置也不同。为实现环内的水力平衡,需满足所有基环的环差为零。本文通过对济南某三热源环状管网供热系统的校核计算,确定设计工况时环网中各个交汇点的位置,通过计算分析所得结果的合理性。
[Abstract]:Multi-heat source networking technology is an advanced hot water pipe network operation technology developed on the basis of comprehensive application of water pump speed regulation technology and control technology in order to save resources, reduce system operation cost and improve economic efficiency. Compared with the traditional single heat source heating system, the special point of the multi-heat source branch pipe network system is the existence of the intersection point. The different position of the heat source makes each heat source bear different heat load and the power consumption of the circulating pump group is also different. So this paper presents a method to find the optimal intersection point in multi-heat source branch pipe network system. When the intersection position moves on the supervisor section, the system state will change only when a branch is crossed. Therefore, it is a discrete mathematical problem to determine the optimal position of the intersection point, and the "point-by-point method" can be used to find the optimal position. Firstly, in this paper, the power consumption of circulating water pump in the multi-heat source branch pipe network system and the operating cost of the heat source are taken as the optimization objective function, and the optimal intersection point is found under the design condition. The influence of these two factors on the optimal position of intersection point is analyzed. At the same time, this paper takes the dendritic pipe network system of three heat sources in a project in Jining district as the research object. According to the specific conditions of the heat source and circulating pump group in the system, the corresponding optimization objective function is established, and the optimization results are compared and analyzed. Therefore, the effectiveness of the objective function and optimization method proposed in this paper is verified, and the guidance is provided for the optimization design of multi-heat source hot water central heating network. Finally, this paper discusses the calculation method of the adjustment in the design process of the multi-heat source ring network system. In the multi-heat source ring network system, the number and position of the intersection points in the system are different due to the different structure of the ring network and the location of the heat source. In order to realize the hydraulic balance in the ring, it is necessary to satisfy the ring difference of all base rings is zero. By checking and calculating the heating system of a three-heat source ring pipe network in Jinan, this paper determines the position of each intersection point in the ring network under the design condition, and the rationality of the results obtained by calculation and analysis.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU995

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