多熱源環(huán)狀管網(wǎng)仿真實驗研究及平臺開發(fā)
發(fā)布時間：2019-04-16 20:50
【摘要】：隨著我國城鎮(zhèn)化進(jìn)程的不斷推進(jìn),居民建筑的規(guī)模和集中供熱的面積日益增加,多熱源環(huán)狀供熱管網(wǎng)依靠其經(jīng)濟(jì)效益高、安全可靠和良好的運(yùn)行靈活性等優(yōu)點,在舊網(wǎng)改造和新網(wǎng)建設(shè)過程中受到越來越多的關(guān)注。然而,由于多熱源環(huán)狀管網(wǎng)的拓?fù)浣Y(jié)構(gòu)較為復(fù)雜、管段和熱用戶的數(shù)量較大,目前仍難以系統(tǒng)、準(zhǔn)確地掌握其運(yùn)行工況下的水力特性,特別是管網(wǎng)水力交匯點的具體數(shù)目和位置,從而直接影響了各熱源的實際供熱范圍和效果。因此,對多熱源環(huán)狀供熱管網(wǎng)來說,在明確水力交匯點數(shù)目和位置的基礎(chǔ)上,系統(tǒng)分析供熱管網(wǎng)的水力和熱力特性,對實現(xiàn)供熱管網(wǎng)的水力和熱力平衡具有重要研究意義和應(yīng)用前景。首先,本文基于流體網(wǎng)絡(luò)分析法,并以圖論為基本理論,利用基爾霍夫定律、管路特性方程和環(huán)能量方程,在對多熱源環(huán)狀管網(wǎng)中的水力交匯用戶進(jìn)行虛擬分割的基礎(chǔ)上,以多熱源環(huán)狀供熱實驗管網(wǎng)為例,重點分析了不同類型公共管道的簡化處理過程。即針對公共管道上是否存在用戶,以及存在用戶時是否存在水力交匯用戶的不同情況,提出了公共管道斷開省略、兩端點設(shè)置虛擬用戶或虛擬熱源等相應(yīng)的水力建模方法。在此基礎(chǔ)上,系統(tǒng)地提出了具有普適性的多熱源環(huán)狀管網(wǎng)的水力建模方法和步驟,并以搭建的多熱源環(huán)狀供熱實驗管網(wǎng)為基礎(chǔ),通過MATLAB軟件,分別建立了單熱源雙環(huán)、雙熱源雙環(huán)和三熱源三環(huán)供熱實驗管網(wǎng)水力仿真模型。其次,利用上述三種不同的水力仿真模型和相對應(yīng)的供熱實驗管網(wǎng),對單熱源雙環(huán)的一種變工況、雙熱源雙環(huán)的理想工況和兩種變工況以及三熱源三環(huán)的理想工況分別進(jìn)行了建模仿真和實驗研究,重點分析水力交匯用戶的數(shù)目和位置,以及各用戶壓差和流量的異同,并在考慮儀表測量誤差的基礎(chǔ)上進(jìn)行誤差分析。結(jié)果表明,在5種工況下,用戶壓差的仿真數(shù)據(jù)與相對應(yīng)的實驗數(shù)據(jù)的相對誤差絕對值的最大值分別為0.42%、2.83%、2.40%、3.17%和0.98%,用戶流量的仿真數(shù)據(jù)與相對應(yīng)的實驗數(shù)據(jù)的相對誤差絕對值的最大值分別為1.96%、2.07%、3.60%、2.18%和1.00%,驗證了該仿真模型的有效性和準(zhǔn)確性,進(jìn)而證明了本文建模方法的合理性和適用性。然后,為了更加系統(tǒng)、高效地進(jìn)行多熱源環(huán)狀供熱管網(wǎng)的水力工況分析,本文在已搭建的多熱源環(huán)狀供熱實驗管網(wǎng)及其水力仿真模型基礎(chǔ)上,利用MATLAB GUI建立一個系統(tǒng)、簡潔的多熱源環(huán)狀供熱實驗管網(wǎng)水力仿真平臺,并生成相應(yīng)的可執(zhí)行文件。平臺界面友好,使用簡單,利用該仿真平臺,可以對供熱實驗管網(wǎng)三種供熱模式下的水力仿真模型的理想工況和變工況進(jìn)行仿真和研究,并能與相應(yīng)實驗數(shù)據(jù)進(jìn)行比較分析,進(jìn)而促進(jìn)對多熱源多環(huán)供熱管網(wǎng)的水力工況進(jìn)行更系統(tǒng)高效的分析與研究。最后,為了進(jìn)一步研究管道散熱損失對集中供熱系統(tǒng)熱力平衡和節(jié)能降耗的影響,本文采用流體網(wǎng)絡(luò)分析法,考慮散熱損失,建立了單熱源枝狀管網(wǎng)(一次網(wǎng))的熱力仿真模型�；诠芫W(wǎng)質(zhì)量平衡和能量平衡,采取質(zhì)調(diào)節(jié)和量調(diào)節(jié),滿足末端用戶熱需求,分析比較了該管網(wǎng)仿真模型的五種熱力工況。仿真結(jié)果表明,在一個供暖期(120天)內(nèi)該模擬管網(wǎng)由散熱損失引起的熱量損耗最少增加6.42×104GJ,同時,在滿足末端用戶熱需求的前提下,熱力平衡比水力平衡至少節(jié)能1.79×10~2GJ。
[Abstract]:With the development of the process of urbanization in China, the scale of the residential building and the area of the central heating are increasing, and the multi-heat-source annular heat-supply pipe network has the advantages of high economic benefit, safety, reliability and good operation flexibility. More and more attention has been paid to the transformation of the old network and the construction of the new network. However, because the topological structure of the multi-heat-source ring-shaped pipe network is more complex, the number of the pipe section and the hot user is large, the system is still difficult to be systematically and accurately controlled, in particular the specific number and the position of the hydraulic pressure point of the pipe network, So that the actual heat supply range and the effect of each heat source are directly affected. Therefore, on the basis of determining the number and position of the water-supply pipe network, the hydraulic and thermal characteristics of the heat-supply pipe network are systematically analyzed on the basis of specifying the number and the position of the water-supply pipe network, and the hydraulic and thermal balance of the heat-supply pipe network has important research significance and application prospect. First, based on the fluid network analysis method, and based on the theory of the basic theory, the Kirchhoff's law, the pipeline characteristic equation and the ring energy equation are used, on the basis of the virtual division of the hydraulic junction user in the multi-heat source ring-shaped pipe network, the multi-heat source annular heat supply experimental pipe network is taken as an example, The simplified process of the common pipeline of different types is analyzed. Namely, whether a user exists on a common pipeline and whether there is a different situation of a hydraulic convergence user in the presence of a user, and a corresponding hydraulic modeling method such as a virtual user or a virtual heat source and the like is arranged at two ends of the common pipeline. On the basis of this, the hydraulic modeling method and the step of the universal multi-heat-source ring-shaped pipe network are put forward, and the single-heat-source double-ring is established by the MATLAB software based on the built multi-heat source annular heat-supply experimental pipe network. Hydraulic simulation model of double-heat-source double-ring and three-heat-source three-ring heat-supply experimental pipe network. Secondly, using the three different hydraulic simulation models and the corresponding heat supply experiment pipe network, the model simulation and experimental study of one variable working condition of single heat source double ring, the ideal working condition of double heat source double ring and the ideal working condition of three-heat source three-ring are respectively carried out, The number and position of the hydraulic cross user and the difference between the pressure and the flow of each user are analyzed, and the error analysis is carried out on the basis of the measurement error of the instrument. The results show that the absolute value of the relative error of the user pressure difference is 0.42%, 2.83%, 2.40%, 3.17% and 0.98%, respectively, under 5 working conditions. The simulation data of user traffic and the relative error absolute value of the corresponding experimental data are 1.96%, 2.07%, 3.60%, 2.18% and 1.00%, respectively, and the validity and accuracy of the simulation model are verified, and the rationality and applicability of the modeling method are also proved. Then, in order to make a more systematic and efficient analysis of the hydraulic working condition of the multi-heat source annular heat supply network, this paper establishes a system using the MATLAB GUI on the basis of the established multi-heat source annular heat supply experimental pipe network and the hydraulic simulation model. The compact multi-heat source annular heat supply experimental pipe network hydraulic simulation platform and the corresponding executable file are generated. The platform interface is friendly, the use is simple, the simulation platform is utilized, the ideal working condition and the variable working condition of the hydraulic simulation model under the three heating modes of the heat supply experimental pipe network can be simulated and researched, and the comparison and analysis with the corresponding experimental data can be carried out, And further, the hydraulic working condition of the multi-heat source multi-ring heat supply pipe network is promoted to be analyzed and researched more efficiently. Finally, in order to further study the influence of the heat dissipation loss on the heat balance and energy saving of the central heating system, this paper adopts the fluid network analysis method to consider the heat dissipation loss and establishes the heat simulation model of the single-heat-source heat-dissipation pipe network (primary network). Based on the mass balance and energy balance of the pipe network, the quality adjustment and the quantity adjustment are adopted to meet the heat demand of the end users, and the five thermal conditions of the pipe network simulation model are analyzed and compared. The simulation results show that, in a heating period (120 days), the heat loss caused by the heat dissipation loss is at least 6.42-104GJ, and at the same time, the heat balance is at least 1.79-104GJ at least energy-saving and 1.79-104GJ under the premise of meeting the heat demand of the end users.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU995.3
本文編號：2459094
[Abstract]:With the development of the process of urbanization in China, the scale of the residential building and the area of the central heating are increasing, and the multi-heat-source annular heat-supply pipe network has the advantages of high economic benefit, safety, reliability and good operation flexibility. More and more attention has been paid to the transformation of the old network and the construction of the new network. However, because the topological structure of the multi-heat-source ring-shaped pipe network is more complex, the number of the pipe section and the hot user is large, the system is still difficult to be systematically and accurately controlled, in particular the specific number and the position of the hydraulic pressure point of the pipe network, So that the actual heat supply range and the effect of each heat source are directly affected. Therefore, on the basis of determining the number and position of the water-supply pipe network, the hydraulic and thermal characteristics of the heat-supply pipe network are systematically analyzed on the basis of specifying the number and the position of the water-supply pipe network, and the hydraulic and thermal balance of the heat-supply pipe network has important research significance and application prospect. First, based on the fluid network analysis method, and based on the theory of the basic theory, the Kirchhoff's law, the pipeline characteristic equation and the ring energy equation are used, on the basis of the virtual division of the hydraulic junction user in the multi-heat source ring-shaped pipe network, the multi-heat source annular heat supply experimental pipe network is taken as an example, The simplified process of the common pipeline of different types is analyzed. Namely, whether a user exists on a common pipeline and whether there is a different situation of a hydraulic convergence user in the presence of a user, and a corresponding hydraulic modeling method such as a virtual user or a virtual heat source and the like is arranged at two ends of the common pipeline. On the basis of this, the hydraulic modeling method and the step of the universal multi-heat-source ring-shaped pipe network are put forward, and the single-heat-source double-ring is established by the MATLAB software based on the built multi-heat source annular heat-supply experimental pipe network. Hydraulic simulation model of double-heat-source double-ring and three-heat-source three-ring heat-supply experimental pipe network. Secondly, using the three different hydraulic simulation models and the corresponding heat supply experiment pipe network, the model simulation and experimental study of one variable working condition of single heat source double ring, the ideal working condition of double heat source double ring and the ideal working condition of three-heat source three-ring are respectively carried out, The number and position of the hydraulic cross user and the difference between the pressure and the flow of each user are analyzed, and the error analysis is carried out on the basis of the measurement error of the instrument. The results show that the absolute value of the relative error of the user pressure difference is 0.42%, 2.83%, 2.40%, 3.17% and 0.98%, respectively, under 5 working conditions. The simulation data of user traffic and the relative error absolute value of the corresponding experimental data are 1.96%, 2.07%, 3.60%, 2.18% and 1.00%, respectively, and the validity and accuracy of the simulation model are verified, and the rationality and applicability of the modeling method are also proved. Then, in order to make a more systematic and efficient analysis of the hydraulic working condition of the multi-heat source annular heat supply network, this paper establishes a system using the MATLAB GUI on the basis of the established multi-heat source annular heat supply experimental pipe network and the hydraulic simulation model. The compact multi-heat source annular heat supply experimental pipe network hydraulic simulation platform and the corresponding executable file are generated. The platform interface is friendly, the use is simple, the simulation platform is utilized, the ideal working condition and the variable working condition of the hydraulic simulation model under the three heating modes of the heat supply experimental pipe network can be simulated and researched, and the comparison and analysis with the corresponding experimental data can be carried out, And further, the hydraulic working condition of the multi-heat source multi-ring heat supply pipe network is promoted to be analyzed and researched more efficiently. Finally, in order to further study the influence of the heat dissipation loss on the heat balance and energy saving of the central heating system, this paper adopts the fluid network analysis method to consider the heat dissipation loss and establishes the heat simulation model of the single-heat-source heat-dissipation pipe network (primary network). Based on the mass balance and energy balance of the pipe network, the quality adjustment and the quantity adjustment are adopted to meet the heat demand of the end users, and the five thermal conditions of the pipe network simulation model are analyzed and compared. The simulation results show that, in a heating period (120 days), the heat loss caused by the heat dissipation loss is at least 6.42-104GJ, and at the same time, the heat balance is at least 1.79-104GJ at least energy-saving and 1.79-104GJ under the premise of meeting the heat demand of the end users.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU995.3
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，本文編號：2459094
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