长距离大高差热电联产供热管网设计方案研究

发布时间：2019-05-06 12:35

【摘要】：由于热电联产集中供热具有能源综合利用效率高、节能环保等优势,目前我国城市供热已经形成“以燃煤热电联产和大型锅炉房集中供热为主、分散燃煤锅炉和其他清洁(或可再生)能源供热为辅”的供热格局。随着城市集中供热的发展,热媒输送距离不断延长,供热管线沿途地形复杂程度提高,长距离大高差热电联产供热项目逐年增加。此类项目设计方案的制定以及其在技术、经济方面的可行性因每个项目自身条件的差别会得出不同的结论。若设计方案制定合理,在后期实施时将会事半功倍,否则将事倍功半。这就使得科学制定此类项目设计方案这项工作具有十分重要的意义。本文运用软件模拟与理论分析相结合的方法,以此类项目实际工程为背景进行专门的研究。首先以flowra软件辅助水力计算为基础,基于不同的设计压力等级以及管网加压方案等因素制定了四种可实施的设计方案,并分别进行相关的应力分析;然后从初投资、运行成本等多角度对不同的设计方案进行分析比较,经过筛选初步确定设计方案,同时得出此类项目采用较高设计压力等级、分布加压方式可以取得更好经济效益的结论;再针对多热源联网方案从经济效益和环境效益两方面进行量化分析,得出对于热电联产项目实行多热源联网能够实现更好的经济效益和环境效益的结论,并据此结论完善上述方案,形成最终设计方案;最后结合管网供热规模大、输送干线长、沿途地势高差大、设计参数高等特点,应用AFT Fathom、AFT Impulse软件对管网在事故工况下进行动态水锤分析,分析系统事故工况下的安全性,一方面制定必要的安全改进措施,另一方面对计算结果加以分析利用,合理地制定了加压站供电方案,降低工程难度、节约工程投资。本研究为长距离大高差热电联产供热管网方案的优化设计提供了技术支撑,对同类项目最优设计方案的制定具有非常实际的指导意义。
[Abstract]:Due to the advantages of high energy utilization efficiency, energy saving and environmental protection of combined heat and power generation, urban heating in China has been formed at present "mainly by coal-fired co-generation of heat and power and central heating for large-scale boiler houses." Decentralized coal-fired boilers and other clean (or renewable) energy heating patterns. With the development of urban central heating, the distance of heat transfer is continuously extended, the terrain complexity of heating pipeline is increased along the way, and the heating projects of long distance and large height difference cogeneration of heat and power are increasing year by year. The design scheme of this kind of project and its technical and economic feasibility will draw different conclusions according to the different conditions of each project. If the design plan is reasonable, in the later implementation will be twice the effort, otherwise will double the effort. This makes the scientific design of such projects of great significance. In this paper, the method of combining software simulation with theoretical analysis is used to carry out special research on the background of practical engineering of this kind of project. Firstly, based on the flowra software-aided hydraulic calculation, based on different design pressure grades and pipe network pressure schemes, four feasible design schemes are formulated, and the stress analysis is carried out respectively. Then the different design schemes are analyzed and compared from the angle of initial investment, operation cost and so on. After screening, the design scheme is preliminarily determined, and at the same time, it is concluded that this kind of project adopts higher design pressure grade. The result of better economic benefit can be obtained by the way of distributing pressure. Based on the quantitative analysis of the economic and environmental benefits of the multi-heat source networking scheme, it is concluded that the implementation of multi-heat source networking can achieve better economic and environmental benefits for the heat and power co-generation project. According to this conclusion, the above-mentioned scheme is perfected, and the final design scheme is formed. Finally, according to the characteristics of large heating scale, long transportation main line, large height difference along the way and high design parameters, AFT Fathom,AFT Impulse software is used to analyze the dynamic water hammer of the pipe network under the accident condition, and the safety of the system under the accident condition is analyzed. On the one hand, the necessary safety improvement measures are made, on the other hand, the calculation results are analyzed and utilized, and the power supply scheme of the pressurizing station is reasonably worked out to reduce the difficulty of the project and save the investment of the project. This study provides technical support for the optimization design of long-distance and high-difference heat and power co-generation heating pipe network, and has very practical guiding significance for the formulation of the optimal design scheme for similar projects.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU995.3

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