本文選題：固體電蓄熱 + 不同工況��； 參考：《哈爾濱工業(yè)大學》2014年碩士論文

【摘要】：隨著我國風力發(fā)電規(guī)模的逐步擴大，并網(wǎng)和消納問題已成為制約其持續(xù)穩(wěn)定發(fā)展的最重要因素，導致平均利用小時數(shù)大幅降低，嚴重影響風力發(fā)電運行的經(jīng)濟性。針對以上難題，近年來國內(nèi)外一些科研機構(gòu)提出一種固體電蓄熱技術(shù)，該技術(shù)能夠利用風電場的“棄風”電能或常規(guī)低谷電能，通過相應(yīng)的蓄熱裝置轉(zhuǎn)化成較高溫度的顯熱能儲存，可應(yīng)用于冬季熱用戶采暖或進行其他熱能利用，從而在一定程度上解決了由于風電場限電導致的大規(guī)模能源損失問題。在實行峰谷電價的地區(qū)，該技術(shù)可通過高溫蓄熱節(jié)約系統(tǒng)運行費用，同時克服了傳統(tǒng)水蓄熱存在的一系列缺陷。 本文深入研究了固體電蓄熱技術(shù)理論及其裝置的熱工特性。首先，確立了固體電蓄熱裝置的蓄熱材料及其結(jié)構(gòu)形式。以蓄熱單元作為研究對象，在合理簡化的基礎(chǔ)上對其進行數(shù)學建模，結(jié)合貝塞爾方程的有關(guān)性質(zhì)并采用分離變量法，得到均勻初始溫度下蓄熱單元傳熱過程的溫度場解析解。分別對三種不同工況的熱過程進行模擬分析，并做出相關(guān)結(jié)構(gòu)參數(shù)與運行參數(shù)的影響研究。 基于以上溫度場解析解，對蓄熱單元在非均勻初始溫度下的不同工況組合情況進行分類，并將初始溫度條件進行積分平均近似處理，進而分別求得溫度場理論解表達式。選取一典型周期模擬了不同初始和邊界條件組合連續(xù)作用下的運行過程，得到不同時刻與相對位置的蓄熱單元溫度場及其相關(guān)熱量參數(shù)的變化特性。 最后，針對固體電蓄熱裝置整體建立了蓄熱單元棒簇與取熱流體之間熱過程的數(shù)學模型，通過分析各項數(shù)量級對微分方程進行了簡化處理，求解出取熱流體以及單排蓄熱棒簇外表面的溫度場分布表達式。以一個具體案例，在某一釋熱階段內(nèi)進行蓄熱棒簇與取熱流體的溫度場及其熱量參數(shù)的分析，揭示了固體電蓄熱裝置的傳熱特性，并為其設(shè)計與運行模擬提供了理論依據(jù)和計算方法。 本文研究成果為固體電蓄熱裝置的深化設(shè)計及各運行參數(shù)的合理匹配建立了理論研究基礎(chǔ)，同時為系統(tǒng)的應(yīng)用與推廣提供相應(yīng)的技術(shù)參考。
[Abstract]:With the gradual expansion of the scale of wind power generation in China, the problem of grid connection and absorption has become the most important factor that restricts its sustainable and stable development, resulting in a significant reduction in the average number of hours utilized, which seriously affects the economy of the operation of wind power generation. In view of the above problems, in recent years, some research institutions at home and abroad have put forward a kind of solid electric energy storage technology, which can utilize wind farm "abandoned wind energy" or conventional low energy. The heat storage device can be used for heating or other thermal energy utilization in winter, thus solving the problem of large-scale energy loss caused by wind farm power limitation to a certain extent. In the areas where peak and valley electricity prices are implemented, the technology can save the operating cost of the system by means of high temperature heat storage and overcome a series of defects existing in the traditional water heat storage. In this paper, the theory of solid-state electric heat storage and the thermal characteristics of the device are studied. Firstly, the thermal storage material and its structure of solid electric thermal storage device are established. Taking the heat storage unit as the object of study, the mathematical model is established on the basis of reasonable simplification. Combining with the properties of the Bessel equation and the method of separating variables, the analytical solution of the heat transfer process of the heat storage unit at uniform initial temperature is obtained. The thermal processes under three different operating conditions were simulated and analyzed respectively, and the effects of related structural parameters and operation parameters were studied. Based on the analytical solution of the temperature field above, the different working conditions of the heat storage unit under the non-uniform initial temperature are classified, and the initial temperature conditions are treated with the integral average approximation, and the theoretical expressions of the temperature field are obtained respectively. A typical period is selected to simulate the operation process under the combined continuous action of different initial and boundary conditions, and the variation characteristics of the temperature field and the related heat parameters of the regenerative unit at different time and relative position are obtained. Finally, the mathematical model of the thermal process between the heat storage unit cluster and the heat recovery fluid is established for the solid electric heat storage device, and the differential equations are simplified by analyzing the various orders of magnitude. The expressions of the temperature field distribution on the outer surface of the heat extraction fluid and the single row regenerative rod cluster are obtained. In a specific case, the heat transfer characteristics of the solid electric heat storage device are revealed by analyzing the temperature field and the heat parameters of the regenerative rod cluster and the heat recovery fluid in a certain heat release stage. It also provides theoretical basis and calculation method for its design and operation simulation. The research results of this paper have established the theoretical research foundation for the deepening design of the solid electric heat storage device and the reasonable matching of the operation parameters, and also provided the corresponding technical reference for the application and popularization of the system.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM614

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