本文選題：干熱巖　切入點：供暖　出處：《沈陽工業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著當代社會對能源的依賴逐漸增長,化石類能源日漸枯竭,人們對生存環(huán)境條件的標準日益提高,地熱能這一綠色新型清潔能源的開發(fā)已經(jīng)受到發(fā)達國家的高度重視。近年來特別是針對地下干熱巖資源的開發(fā)項目早己在很多發(fā)達國家的積極研究當中,但干熱巖資源的開發(fā)應(yīng)用在全球范圍內(nèi)也尚是起步階段,對我國而言,更是處于理論階段。東北地區(qū)的供暖條件是一個永恒的話題,以往傳統(tǒng)的以化石燃料為主的供暖方式不符合可持續(xù)發(fā)展的戰(zhàn)略布局,本文借鑒了國內(nèi)外相關(guān)文獻,結(jié)合國內(nèi)外干熱巖開發(fā)案例,基于干熱巖資源的開采優(yōu)勢,以沈陽地區(qū)為例,研究開發(fā)干熱巖資源冬季供暖的可實施性和優(yōu)勢,形成利用干熱巖資源供暖的方案和系統(tǒng)模擬結(jié)構(gòu),將若干口注入井對接到一口輸出井上,循環(huán)水在井內(nèi)流動換取干熱巖熱量,送達地面實現(xiàn)供暖。研究表明干熱巖資源供暖過程中的核心技術(shù)包括巖石的導(dǎo)熱性能及巖石和水的熱交換能力、井管尺寸及結(jié)構(gòu)是實現(xiàn)干熱巖供暖的重要前提,同時溫泉水屬于地下熱能的一部分,顯然提取溫泉水的熱量相對更加經(jīng)濟、方便,但是地下溫泉水不被允許大量開采,如何高效的換取地下溫泉水的熱量也是本文所研究的內(nèi)容,可以采用將換熱器下放到溫泉中的方式進行換熱,所以需要對換熱器的結(jié)構(gòu)進行設(shè)計,本文針對地下溫泉的特殊性設(shè)計了一種新型波紋管換熱器,考慮到地下的高壓以及內(nèi)外的溫度差,因此對換熱器進行載荷以及溫差變形校驗,并通過有限元數(shù)值模擬對干熱巖及換熱器進行了熱交換及壓降分析,分別研究了在不同的流速及地溫梯度下水被加熱到一定值時對所需要井深和壓降的影響以及在不同的結(jié)構(gòu)下水被加熱到相同溫度時對所需波紋管長的影響,并對換熱量進行了計算,最后對整個干熱巖換熱系統(tǒng)進行了經(jīng)濟性分析,整個系統(tǒng)的前期投入會較大,但是長期運行起來將受益巨大。研究表明,若以上干熱巖供暖關(guān)鍵問題得到更合理更科學的的設(shè)計和研究,那么在利用地熱能源對東北地區(qū)進行供暖方面將取得技術(shù)上的巨大突破。
[Abstract]:With the increasing dependence on energy and the depletion of fossil energy in contemporary society, the standard of living environment is becoming higher and higher. The development of geothermal energy, a new green and clean energy, has been highly valued by developed countries. In recent years, especially the development projects for underground dry hot rock resources have long been actively studied in many developed countries. But the exploitation and application of dry-hot rock resources in the whole world is still at the beginning stage, and for our country, it is also in the theoretical stage. The heating condition in Northeast China is an eternal topic. The traditional heating mode based on fossil fuel is not in line with the strategic layout of sustainable development in the past. This paper draws lessons from relevant literature at home and abroad and combines the case of dry hot rock development at home and abroad, based on the exploitation advantages of dry hot rock resources. Taking Shenyang area as an example, the practicability and advantage of developing dry hot rock resource heating in winter are studied, and the scheme and system simulation structure of heating using dry hot rock resource are formed, and several injection wells are connected to an output well. Circulating water flows in wells in exchange for heat from dry hot rock and reaches the ground for heating. The research shows that the core technology in the heating process of dry hot rock resources includes the thermal conductivity of rock and the heat exchange capacity of rock and water. The size and structure of the well pipe is an important prerequisite for the dry-hot rock heating. At the same time, the hot spring water is part of the underground heat energy. Obviously, it is more economical and convenient to extract the heat from the hot spring water, but the underground hot spring water is not allowed to be exploited in large quantities. How to exchange the heat of underground hot spring water efficiently is also the content of this paper. The heat exchanger can be transferred to the hot spring, so it is necessary to design the structure of the heat exchanger. In this paper, a new type of bellows heat exchanger is designed according to the particularity of underground hot spring. Considering the high pressure of underground and the difference of temperature inside and outside, the load and temperature difference deformation of heat exchanger are checked. The heat exchange and pressure drop of dry hot rock and heat exchanger are analyzed by finite element numerical simulation. The effects of different velocity of water and geothermal gradient on the required well depth and pressure drop when heated to a certain value and on the required bellows length when the water of different structures are heated to the same temperature are studied respectively. The heat transfer is calculated. Finally, the economic analysis of the whole dry hot rock heat transfer system is carried out. The early investment of the whole system will be large, but the long-term operation will benefit a great deal. If the above key problems of dry-hot rock heating are designed and studied more reasonably and scientifically, a great breakthrough will be made in the use of geothermal energy to heat heating in Northeast China.
【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU832

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