【摘要】：由于集中供熱具有供熱效率高,環(huán)境污染物排放易于集中處理等優(yōu)點(diǎn),在國家的高度重視和大力支持下,我國的集中供熱事業(yè)在近年來取得了迅速的發(fā)展。但由于我國的供熱事業(yè)起點(diǎn)較低且起步較晚,供熱系統(tǒng)的能源利用效率仍然較低。面對日益嚴(yán)峻的全球性能源制約和環(huán)境問題,集中供熱系統(tǒng)的節(jié)能、高效運(yùn)行成為我國供熱行業(yè)必須重視的問題。為了在滿足熱用戶舒適度的前提下實(shí)現(xiàn)供熱系統(tǒng)的節(jié)能運(yùn)行,就需要使系統(tǒng)的供熱量隨時與熱用戶的需熱量保持一致。因此,對供熱系統(tǒng)的動態(tài)熱力工況進(jìn)行分析就顯得非常重要。本文首先建立考慮管段溫度衰減度的集中供熱系統(tǒng)熱力工況數(shù)學(xué)計算模型。改進(jìn)了常規(guī)的供熱管網(wǎng)模型,在熱用戶的進(jìn)出口處增加節(jié)點(diǎn),建立了考慮管段溫度衰減的熱力工況網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu);分析了直接連接供熱系統(tǒng)和間接連接供熱系統(tǒng)的熱力特性,建立了直接連接供熱系統(tǒng)熱力工況計算模型和間接連接供熱系統(tǒng)熱力工況計算模型�；诠芫W(wǎng)的動態(tài)特性建立了管段溫度衰減度的計算模型,并用實(shí)際供熱系統(tǒng)的運(yùn)行監(jiān)測數(shù)據(jù)對模型進(jìn)行驗(yàn)證,表明了理論模型建立的正確性。利用建立的供熱系統(tǒng)熱力工況計算模型對供熱系統(tǒng)進(jìn)行熱力工況分析。研究不同運(yùn)行調(diào)節(jié)方式下,管段溫度衰減度對熱用戶室內(nèi)溫度的影響規(guī)律。通過分析可以看出:在每個供暖階段內(nèi),隨著室外溫度的升高,管段溫度衰減對熱用戶室內(nèi)溫度的影響不斷減弱;集中供熱調(diào)節(jié)時應(yīng)考慮管網(wǎng)溫度的衰減,在提高熱源出口供水溫度保證各熱用戶都能達(dá)到供熱要求的前提下,再根據(jù)熱用戶的過熱情況對熱用戶處的流量進(jìn)行局部調(diào)節(jié),以減少用戶的熱力不平衡；
[Abstract]:Due to the advantages of high heating efficiency and easy centralized treatment of environmental pollutants, the central heating industry in China has been developing rapidly in recent years with the great attention and support of our country. However, the energy efficiency of the heating system is still low because of the lower starting point and late start of the heating industry in China. In the face of increasingly severe global energy constraints and environmental problems, the energy saving and efficient operation of central heating system has become a problem that our heating industry must pay attention to. In order to realize the energy-saving operation of the heating system under the premise of satisfying the comfort of the heat users, it is necessary to keep the heat supply of the system consistent with that of the heat users at any time. Therefore, it is very important to analyze the dynamic thermal condition of heating system. In this paper, a mathematical model of central heating system is established considering the temperature attenuation of pipe section. The conventional heat supply network model is improved, the nodes are added at the inlet and outlet of the heat user, the topology of the network considering the temperature attenuation of the pipe section is established, and the thermodynamic characteristics of the direct and indirect connection heating system are analyzed. The calculation model of direct connection heating system and indirect connection heating system is established. Based on the dynamic characteristics of the pipe network, the calculation model of the temperature attenuation of the pipe section is established, and the model is verified by the operation monitoring data of the actual heating system, which shows the correctness of the establishment of the theoretical model. The thermal working conditions of the heating system are analyzed by using the established heat supply system calculation model. The influence of pipe temperature attenuation on the indoor temperature of hot users was studied under different operation regulation modes. Through analysis, we can see that in each heating stage, with the increase of outdoor temperature, the influence of pipe section temperature attenuation on the indoor temperature of thermal users is weakened, and the attenuation of pipe network temperature should be considered in central heating regulation. On the premise of raising the water supply temperature at the outlet of the heat source to ensure that all the heat users can meet the requirements of heating, the flow rate of the heat user is locally adjusted according to the overheating condition of the heat user, so as to reduce the thermal imbalance of the user.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU995

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本文編號：2206000