分布式变频供暖输配系统应用研究

发布时间：2018-06-05 12:01

本文选题：分布式 + 输配能耗　；参考：《长春工程学院》2015年硕士论文

【摘要】：随着我国城镇化进程的加快,集中供热系统的规模越来越大。大部分的供热系统还是按传统的集中动力式输配系统进行设计。这样的系统容易形成近端热用户节流损失严重,远端热用户资用压头不足的现象。集中动力供暖输配系统不仅输配能耗大,而且容易形成冷热不均。针对以上问题,有学者提出了分布式变频供暖输配系统。随着近几年变频技术和水泵的生产工艺的不断发展,分布式变频供暖输配系统成为当今研究的热点。本文以集中供热系统二次网为研究对象,以长春市某小区为工程背景,通过对比分析的研究方法,对分布式变频供暖输配控制系统定零压差的控制方式研究如下:首先,对集中动力式供暖输配系统与分布式变频供暖输配系统的水泵布置形式、系统水压图、调节方式进行了对比分析。得出分布式变频供暖输配系统零压差控制点的位置选择不当,也会存在节流损失。零压差控制点距离热源越近,系统的水泵装配数量越多,装机功率越小,系统运行越节能。分布式变频供暖输配系统之所以节能,是因为在输配过程中没有节流损失,通过改变水泵的转速进行变流量调节,主循环泵与热用户泵相互配合,按需输配,不存在节流损失。其次,为了研究分布式变频供暖输配控制系统定零压差的控制方式在实际工程当中的应用,设计了一个模糊控制器,并在MATLAB软件上对其控制效果进行了仿真分析,结果表明控制效果良好。搭建了分布式变频供暖输配系统实验台,在实验台上分别对分布式变频供暖输配系统、集中动力式输配系统、热用户泵在供水管上分布式变频输配系统、热用户泵在回水管上分布式变频供暖输配系统、零压差控制点选在不同的位置的分布式变频输配系统的输配能耗、供暖效果进行了实验研究。研究结果表明,分布式变频供暖输配系统的节能效果与水泵的布置形式无关,与零压差控制点选择的位置有关。在全网都进行分布式变频调节时,系统的输配能耗最低。在同样的供热负荷下,分布式变频供暖输配系统比传统集中动力式输配系统可以节省输配电耗12%左右。最后,用工程实例对传统集中动力式输配系统改造为分布式变频供暖输配系统的节能效果进行了分析。运用工程经济学里的静态评价方法对工程改造前后的初投资和回收年限进行了计算。结果表明工程改造后的初投资回收年限约在3年左右,低于供热行业的基准回收期,证明技术改造可行。本文的研究成果将对以后的工程改造提供借鉴。
[Abstract]:With the acceleration of urbanization in China, the scale of central heating system is becoming larger and larger. Most of the heating systems are designed according to the traditional centralized power transmission and distribution system. This kind of system is easy to form the phenomenon of severe throttling loss of the near end hot user and insufficient pressure head of the remote hot user. Central power heating transmission and distribution system not only energy consumption, but also easy to form uneven cold and heat. In view of the above problems, some scholars put forward the distributed frequency conversion heating transmission and distribution system. With the continuous development of frequency conversion technology and pump production technology in recent years, distributed frequency conversion heating transmission and distribution system has become a hot research topic. This paper takes the secondary network of central heating system as the research object, taking a small district of Changchun as the engineering background, through the comparative analysis research method, studies the distributed frequency conversion heating transmission and distribution control system fixed zero pressure difference control way as follows: first, The water pump layout, water pressure diagram and regulation mode of centralized power heating transmission and distribution system and distributed frequency conversion heating transmission and distribution system are compared and analyzed. It is concluded that if the position of zero pressure difference control point of distributed frequency conversion heating transmission and distribution system is improperly selected, there will also be throttling loss. The closer the zero pressure difference control point is to the heat source, the more water pump is assembled, and the smaller the power is, the more energy saving the system runs. The reason for energy saving in distributed frequency conversion heating transmission and distribution system is that there is no throttling loss in the transmission and distribution process. By changing the rotational speed of the pump to adjust the variable flow rate, the main circulating pump and the heat user pump cooperate with each other, and there is no throttling loss on demand. Secondly, in order to study the application of the zero pressure difference control method in the distributed frequency conversion heating transmission and distribution control system, a fuzzy controller is designed, and its control effect is simulated and analyzed on the MATLAB software. The results show that the control effect is good. The distributed frequency conversion heating transmission and distribution system was built. The distributed frequency conversion heating transmission and distribution system, the centralized power transmission and distribution system and the thermal user pump distributed frequency conversion transmission and distribution system on the water supply pipe were set up on the test table. The distribution energy consumption and heating effect of distributed frequency conversion heating transmission and distribution system with zero pressure difference control point in different position are studied experimentally in the distributed frequency conversion heating transmission and distribution system of hot user pump on backwater pipe. The results show that the energy saving effect of distributed frequency conversion heating transmission and distribution system is independent of the layout of water pump and is related to the position of zero pressure difference control point. The energy consumption of the system is the lowest when distributed frequency conversion regulation is carried out in the whole network. Under the same heating load, the distributed frequency conversion heating transmission and distribution system can save transmission and distribution consumption by about 12% compared with the traditional centralized power transmission and distribution system. Finally, the energy saving effect of the traditional centralized power transmission and distribution system transformed into the distributed frequency conversion heating transmission and distribution system is analyzed with an engineering example. The static evaluation method in engineering economics is used to calculate the initial investment and return life before and after the project transformation. The results show that the initial investment recovery life of the project is about 3 years, which is lower than the standard recovery period of the heating industry, which proves that the technical transformation is feasible. The research results of this paper will be used for reference in the future engineering transformation.
【学位授予单位】：长春工程学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU995

【相似文献】