长距离供热管网保温厚度及中继泵站设置的研究

发布时间：2018-05-03 01:23

  本文选题：供热管网 + 直埋管道　； 参考：《天津大学》2014年硕士论文

【摘要】：随着经济的蓬勃发展和人民生活水平的迅速提高,使得人们对生活环境的舒适性要求大幅提升,城市集中供热因为其在节约一次能源,改善环境,提高人民的生活水平等方面的突出优点,从而得到了飞速发展。城市供热管网规模越来越大,并且由于城市环境保护的要求,许多城市不允许在市内建设城市集中供热热源,将热源建设在离城区较远的地方,从而导致供热半径增大。由于供热规模以及供热半径的增大,出现了长距离供热的情况。长距离供热管网对于大管径保温管道的需求很大,管网的敷设也多采用两种或两种以上的敷设方式。多种敷设方式相结合的供热管网的保温层厚度的确定,对于降低整个管道的初投资和系统的运行费用、提高效益具有很大意义。对于大规模、长距离供热管网,适当设置中继泵站,可以有效解决热网首站循环水泵电耗过大以及整个网路压力水平过高等问题。本文做了两部分研究工作,第一部分主要对同一工程中,同时采用直埋与架空两种敷设方式的供热保温管道的保温厚度进行优化。结合工程实例,通过对直埋与架空管道的热力计算,并利用经济学原理和相关理念,采用由保温管道的初投资与运行费用组成的年均总费用最低法计算管道的经济保温厚度。并分析了经济性因素对经济保温厚度的影响及产生影响的原因,根据直埋管道保温设计规范,提出限定管道外表面温度与优化计算相结合的方式确定直埋管道的保温厚度,并分析了相关因素对通过限定管道外表面温度法所计算出的保温厚度的结果的影响。第二部分主要探讨中继泵站的设置问题,根据工程实例,通过水力计算及水压图的绘制,得出为了满足水力工况要求需要设置中继泵站的结论,并对中继泵站设置级数问题进行了讨论,得到相关结果,并证明了对于输送距离较长的供热管网设置中继泵站的优点。本文的研究结论可以为长距离供热管网的设计提供技术支持。
[Abstract]:With the rapid development of economy and the rapid improvement of people's living standard, people's requirement for comfort of living environment has been greatly raised. Central heating in cities is saving primary energy and improving the environment. Improve the people's living standards and other aspects of outstanding advantages, which has been rapid development. The scale of urban heating network is getting larger and larger, and because of the requirement of urban environmental protection, many cities do not allow the construction of urban central heating heat source in the city, and build the heat source far away from the urban area, thus leading to the increase of heating radius. Due to the increase of heating scale and radius, long-distance heating occurs. There is a great demand for large diameter heat preservation pipeline in long distance heating network, and two or more kinds of laying methods are used in the laying of pipe network. It is of great significance to determine the thickness of the insulation layer of the heating pipe network combined with various laying methods for reducing the initial investment of the whole pipeline and the operating cost of the system and improving the efficiency. For large-scale, long-distance heating network, proper setting of relay pumping station can effectively solve the problems of excessive power consumption of circulating water pump and high pressure level of the whole network in the first station of heat network. In this paper, two parts of research work have been done. The first part is to optimize the heat preservation thickness of the heating and heat preservation pipeline which adopts two laying ways of direct buried and aerial laying in the same project. Combined with engineering examples, the economic insulation thickness of pipeline is calculated by means of thermodynamic calculation of directly buried and overhead pipelines, using economic principles and related concepts, and using the lowest annual annual total cost method, which consists of initial investment and operation cost of thermal insulation pipeline. The influence of economic factors on the economic insulation thickness and its causes are analyzed. According to the thermal insulation design code of direct-buried pipeline, the combination of limiting the outer surface temperature of pipeline and optimizing calculation is put forward to determine the thermal insulation thickness of direct-buried pipeline. The influence of relevant factors on the results of the heat preservation thickness calculated by limiting the outer surface temperature method of the pipeline is analyzed. The second part mainly discusses the problem of setting up the relay pumping station. According to the engineering example, through hydraulic calculation and the drawing of hydraulic pressure diagram, the conclusion that the relay pump station should be set up to meet the requirement of hydraulic condition is concluded. The series of relay pumping stations is discussed and the relevant results are obtained. The advantages of setting up relay pumping stations for heating networks with long distance are proved. The conclusion of this paper can provide technical support for the design of long-distance heating network.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU995

【引证文献】

中国硕士学位论文全文数据库 前2条

1 孙海林;山西某县城集中供热规划方案优化研究[D];西安建筑科技大学;2017年

2 郑秋爽;热水供热系统长输管线的可靠性研究[D];哈尔滨工业大学;2017年

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本文编号：1836363