本文選題：分布式 + 輸配能耗��； 參考：《長春工程學(xué)院》2015年碩士論文

【摘要】：隨著我國城鎮(zhèn)化進(jìn)程的加快,集中供熱系統(tǒng)的規(guī)模越來越大。大部分的供熱系統(tǒng)還是按傳統(tǒng)的集中動(dòng)力式輸配系統(tǒng)進(jìn)行設(shè)計(jì)。這樣的系統(tǒng)容易形成近端熱用戶節(jié)流損失嚴(yán)重,遠(yuǎn)端熱用戶資用壓頭不足的現(xiàn)象。集中動(dòng)力供暖輸配系統(tǒng)不僅輸配能耗大,而且容易形成冷熱不均。針對(duì)以上問題,有學(xué)者提出了分布式變頻供暖輸配系統(tǒng)。隨著近幾年變頻技術(shù)和水泵的生產(chǎn)工藝的不斷發(fā)展,分布式變頻供暖輸配系統(tǒng)成為當(dāng)今研究的熱點(diǎn)。本文以集中供熱系統(tǒng)二次網(wǎng)為研究對(duì)象,以長春市某小區(qū)為工程背景,通過對(duì)比分析的研究方法,對(duì)分布式變頻供暖輸配控制系統(tǒng)定零壓差的控制方式研究如下:首先,對(duì)集中動(dòng)力式供暖輸配系統(tǒng)與分布式變頻供暖輸配系統(tǒng)的水泵布置形式、系統(tǒng)水壓圖、調(diào)節(jié)方式進(jìn)行了對(duì)比分析。得出分布式變頻供暖輸配系統(tǒng)零壓差控制點(diǎn)的位置選擇不當(dāng),也會(huì)存在節(jié)流損失。零壓差控制點(diǎn)距離熱源越近,系統(tǒng)的水泵裝配數(shù)量越多,裝機(jī)功率越小,系統(tǒng)運(yùn)行越節(jié)能。分布式變頻供暖輸配系統(tǒng)之所以節(jié)能,是因?yàn)樵谳斉溥^程中沒有節(jié)流損失,通過改變水泵的轉(zhuǎn)速進(jìn)行變流量調(diào)節(jié),主循環(huán)泵與熱用戶泵相互配合,按需輸配,不存在節(jié)流損失。其次,為了研究分布式變頻供暖輸配控制系統(tǒng)定零壓差的控制方式在實(shí)際工程當(dāng)中的應(yīng)用,設(shè)計(jì)了一個(gè)模糊控制器,并在MATLAB軟件上對(duì)其控制效果進(jìn)行了仿真分析,結(jié)果表明控制效果良好。搭建了分布式變頻供暖輸配系統(tǒng)實(shí)驗(yàn)臺(tái),在實(shí)驗(yàn)臺(tái)上分別對(duì)分布式變頻供暖輸配系統(tǒng)、集中動(dòng)力式輸配系統(tǒng)、熱用戶泵在供水管上分布式變頻輸配系統(tǒng)、熱用戶泵在回水管上分布式變頻供暖輸配系統(tǒng)、零壓差控制點(diǎn)選在不同的位置的分布式變頻輸配系統(tǒng)的輸配能耗、供暖效果進(jìn)行了實(shí)驗(yàn)研究。研究結(jié)果表明,分布式變頻供暖輸配系統(tǒng)的節(jié)能效果與水泵的布置形式無關(guān),與零壓差控制點(diǎn)選擇的位置有關(guān)。在全網(wǎng)都進(jìn)行分布式變頻調(diào)節(jié)時(shí),系統(tǒng)的輸配能耗最低。在同樣的供熱負(fù)荷下,分布式變頻供暖輸配系統(tǒng)比傳統(tǒng)集中動(dòng)力式輸配系統(tǒng)可以節(jié)省輸配電耗12%左右。最后,用工程實(shí)例對(duì)傳統(tǒng)集中動(dòng)力式輸配系統(tǒng)改造為分布式變頻供暖輸配系統(tǒng)的節(jié)能效果進(jìn)行了分析。運(yùn)用工程經(jīng)濟(jì)學(xué)里的靜態(tài)評(píng)價(jià)方法對(duì)工程改造前后的初投資和回收年限進(jìn)行了計(jì)算。結(jié)果表明工程改造后的初投資回收年限約在3年左右,低于供熱行業(yè)的基準(zhǔn)回收期,證明技術(shù)改造可行。本文的研究成果將對(duì)以后的工程改造提供借鑒。
[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.
【學(xué)位授予單位】：長春工程學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU995

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本文編號(hào)：1981921