天然氣管網(wǎng)特征線法動態(tài)仿真分析
發(fā)布時間：2018-11-28 14:46
【摘要】：天然氣與煤炭、石油等能源相比,具有無廢渣廢水、熱值高、安全性好、清潔度高等優(yōu)勢,所以在發(fā)展低碳經(jīng)濟的時代背景下,天然氣的使用備受青睞。管道作為天然氣的主要運輸方式,正朝著長距離、大口徑、高壓力和網(wǎng)絡(luò)化的方向發(fā)展,逐漸形成了大型、復(fù)雜的供氣系統(tǒng)。由于天然氣管網(wǎng)系統(tǒng)日趨大型化和復(fù)雜化,增加了人們準確了解和掌握其運行規(guī)律的難度,限制了天然氣管網(wǎng)優(yōu)化方案的制定,使對天然氣管網(wǎng)系統(tǒng)突發(fā)工況的分析和處理變得更加困難,并嚴重阻礙了天然氣管網(wǎng)系統(tǒng)的合理規(guī)劃設(shè)計、安全調(diào)度管理以及精確操作控制。所以,為了準確研究大型復(fù)雜天然氣管網(wǎng)系統(tǒng),天然氣管網(wǎng)仿真技術(shù)應(yīng)運而生。它揭示了在不同設(shè)計、調(diào)度和操作方案下,天然氣管網(wǎng)內(nèi)的流動工藝和水力、熱力分布,描述不同操作、變化和事故條件下的水力、熱力變化趨勢和過程,是天然氣管網(wǎng)實施各種決策方案的支撐技術(shù)。因此,本文的研究對天然氣管網(wǎng)的優(yōu)化設(shè)計、有效管理、合理調(diào)度、可靠運行具有重要意義。本文調(diào)研了大量國內(nèi)外文獻,緊跟國內(nèi)外天然氣管網(wǎng)動態(tài)仿真的研究成果,對天然氣管網(wǎng)特征線法動態(tài)仿真進行了分析。首先,針對目前天然氣管網(wǎng)動態(tài)仿真過程中忽略對流項、慣性項和中立項等問題,本文基于適用任意流體的連續(xù)性方程、動量方程、能量方程,結(jié)合真實氣體的狀態(tài)方程以及焓方程,建立了具有普遍適用性的天然氣管道動態(tài)仿真數(shù)學(xué)模型;其次,采用BWRS氣體狀態(tài)方程,通過拋物線法迭代求解,大幅度提高了氣體狀態(tài)參數(shù)的計算速度和精度,并編制了氣體物性包程序,為管網(wǎng)動態(tài)仿真計算奠定了基礎(chǔ);選取適用范圍廣、精度高的Colebrook公式,并采用弦截法計算管道摩阻系數(shù),將摩阻系數(shù)與管道流量關(guān)聯(lián)起來,從而減小了摩阻系數(shù)因定值輸入產(chǎn)生的誤差;再次,引入黎曼不變量n和m,以及微分算子S、M和N,建立了天然氣管網(wǎng)特征線法動態(tài)仿真狀態(tài)空間模型,并結(jié)合初始條件和邊界條件,通過逆步進法和線性內(nèi)插值法對管網(wǎng)動態(tài)仿真模型進行求解,使得求解過程的實現(xiàn)更加便利;最后,以C++Builder XE6.0為開發(fā)平臺,采用C++語言對天然氣管網(wǎng)動態(tài)仿真過程進行編程,并通過天然氣管網(wǎng)實例檢驗本文提出的特征線法動態(tài)仿真分析的可行性。結(jié)果證明了特征線法動態(tài)仿真具有良好的仿真效果,可以為天然氣管網(wǎng)的規(guī)劃、設(shè)計、調(diào)度、控制和管理等各個層次的應(yīng)用提供可靠的依據(jù)。
[Abstract]:Compared with coal, petroleum and other energy sources, natural gas has advantages of high calorific value, good safety and high cleanliness, so the use of natural gas is favored under the background of developing low carbon economy. As the main transportation mode of natural gas, pipeline is developing towards the direction of long distance, large caliber, high pressure and network, and has gradually formed a large and complex gas supply system. Because the natural gas network system is becoming larger and more complicated, it makes it more difficult for people to understand and master its operation law accurately, which limits the formulation of the optimization scheme of natural gas pipeline network. It is more difficult to analyze and deal with the sudden condition of the natural gas pipeline network system, and it seriously hinders the reasonable planning and design, the safety dispatching management and the precise operation control of the natural gas pipe network system. Therefore, in order to accurately study the large complex natural gas network system, the simulation technology of natural gas pipe network came into being. It reveals the flow process, hydraulic and thermal distribution in the natural gas pipe network under different design, scheduling and operation schemes, and describes the trends and processes of hydraulic and thermal changes under different operation, variation and accident conditions. Is the natural gas pipe network implementation of various decision-making support technology. Therefore, the study of this paper is of great significance to the optimization design, effective management, reasonable scheduling and reliable operation of natural gas network. In this paper, a large number of domestic and foreign literatures have been investigated, and the dynamic simulation of natural gas pipeline network characteristic line method has been analyzed by following the research results of natural gas network dynamic simulation at home and abroad. First of all, aiming at the problems of neglecting the convection term, inertia term and neutral term in the dynamic simulation of natural gas network, this paper bases on the continuity equation, momentum equation and energy equation applicable to any fluid. Combined with the state equation and enthalpy equation of real gas, the dynamic simulation mathematical model of natural gas pipeline with universal applicability is established. Secondly, the calculation speed and precision of gas state parameters are improved greatly by using BWRS gas state equation and parabola method, and the gas physical property package program is compiled, which lays a foundation for the dynamic simulation calculation of pipe network. The Colebrook formula with wide application range and high precision is selected, and the friction coefficient of pipeline is calculated by using the chord section method, and the friction coefficient is correlated with the flow rate of the pipeline, thus reducing the error caused by the constant value input of the friction coefficient. Thirdly, by introducing Riemannian invariants n and m, and differential operators Schim and N, the dynamic simulation state space model of natural gas pipeline network characteristic line method is established, and the initial conditions and boundary conditions are combined. The inverse step method and linear interpolation method are used to solve the dynamic simulation model of pipeline network, which makes the solution process more convenient. Finally, using C Builder XE6.0 as the development platform, C language is used to program the dynamic simulation process of natural gas pipeline network, and the feasibility of the dynamic simulation analysis of the characteristic line method proposed in this paper is verified by an example of the natural gas pipeline network. The results show that the feature line method has a good simulation effect and can provide reliable basis for the application of natural gas network planning, design, scheduling, control and management.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE832
本文編號：2363175
[Abstract]:Compared with coal, petroleum and other energy sources, natural gas has advantages of high calorific value, good safety and high cleanliness, so the use of natural gas is favored under the background of developing low carbon economy. As the main transportation mode of natural gas, pipeline is developing towards the direction of long distance, large caliber, high pressure and network, and has gradually formed a large and complex gas supply system. Because the natural gas network system is becoming larger and more complicated, it makes it more difficult for people to understand and master its operation law accurately, which limits the formulation of the optimization scheme of natural gas pipeline network. It is more difficult to analyze and deal with the sudden condition of the natural gas pipeline network system, and it seriously hinders the reasonable planning and design, the safety dispatching management and the precise operation control of the natural gas pipe network system. Therefore, in order to accurately study the large complex natural gas network system, the simulation technology of natural gas pipe network came into being. It reveals the flow process, hydraulic and thermal distribution in the natural gas pipe network under different design, scheduling and operation schemes, and describes the trends and processes of hydraulic and thermal changes under different operation, variation and accident conditions. Is the natural gas pipe network implementation of various decision-making support technology. Therefore, the study of this paper is of great significance to the optimization design, effective management, reasonable scheduling and reliable operation of natural gas network. In this paper, a large number of domestic and foreign literatures have been investigated, and the dynamic simulation of natural gas pipeline network characteristic line method has been analyzed by following the research results of natural gas network dynamic simulation at home and abroad. First of all, aiming at the problems of neglecting the convection term, inertia term and neutral term in the dynamic simulation of natural gas network, this paper bases on the continuity equation, momentum equation and energy equation applicable to any fluid. Combined with the state equation and enthalpy equation of real gas, the dynamic simulation mathematical model of natural gas pipeline with universal applicability is established. Secondly, the calculation speed and precision of gas state parameters are improved greatly by using BWRS gas state equation and parabola method, and the gas physical property package program is compiled, which lays a foundation for the dynamic simulation calculation of pipe network. The Colebrook formula with wide application range and high precision is selected, and the friction coefficient of pipeline is calculated by using the chord section method, and the friction coefficient is correlated with the flow rate of the pipeline, thus reducing the error caused by the constant value input of the friction coefficient. Thirdly, by introducing Riemannian invariants n and m, and differential operators Schim and N, the dynamic simulation state space model of natural gas pipeline network characteristic line method is established, and the initial conditions and boundary conditions are combined. The inverse step method and linear interpolation method are used to solve the dynamic simulation model of pipeline network, which makes the solution process more convenient. Finally, using C Builder XE6.0 as the development platform, C language is used to program the dynamic simulation process of natural gas pipeline network, and the feasibility of the dynamic simulation analysis of the characteristic line method proposed in this paper is verified by an example of the natural gas pipeline network. The results show that the feature line method has a good simulation effect and can provide reliable basis for the application of natural gas network planning, design, scheduling, control and management.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE832
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