地熱井下?lián)Q熱器變工況運行模擬實驗研究
發(fā)布時間：2018-10-05 17:55
【摘要】：能源問題自人類誕生之日起就成為了關(guān)系到生產(chǎn)與生活的主要問題之一,從古至今,人類歷史上也從不缺乏因為能源問題處理不得當而爆發(fā)戰(zhàn)爭的記錄。人類在不斷利用煤炭、石油、天然氣等一次能源的基礎上,迎來了歷史上幾千年來未有的社會大繁榮大發(fā)展,同時也帶來了歷史上幾千年未有的能源與環(huán)境危機。二十世紀末以來,能源日趨枯竭和能源濫用所帶來的嚴重后果已經(jīng)迫使世界各國改變能源利用政策,減少一次能源使用量的同時大力發(fā)展研究清潔無污染的可再生能源。地熱能作為清潔可再生能源的典型代表,不斷研究開發(fā)新的地熱能利用技術(shù)符合我國當下“節(jié)能減排”的大主題。地熱水直接利用和地埋管地源熱泵系統(tǒng)是目前國內(nèi)使用最多的地熱能利用技術(shù),但這兩種方法均存在明顯缺陷,我們必須著力于研究一種新的地熱能利用技術(shù)。地熱井下?lián)Q熱器系統(tǒng)克服了以上兩種地熱能利用形式的缺陷,并兼具兩種形式的優(yōu)勢。既實現(xiàn)了地源熱泵取熱不取水的優(yōu)勢特點,并極大提高了系統(tǒng)的換熱效率。當下,對于地熱井下?lián)Q熱器研究最直接、最高效、最節(jié)約成本的研究方法,就是通過搭建地熱井下?lián)Q熱器模擬試驗臺,模擬真實的地熱井下?lián)Q熱器對流換熱過程,在過程中采集數(shù)據(jù)分析處理,得出相關(guān)結(jié)論。本文通過搭建一整套地熱井下?lián)Q熱器模擬系統(tǒng),該系統(tǒng)與工程實際中的地熱井下?lián)Q熱器運行情況,運行環(huán)境大致相似,通過該系統(tǒng)可以調(diào)節(jié)和控制的變量有模擬熱儲巖石的類型、模擬地熱井的口徑、模擬換熱器銅管管徑、模擬換熱器中循環(huán)水的流速、模擬流場的強弱、模擬熱儲的整體溫度等變量,使其盡可能多的模擬換熱器實際運行時的各種工況。模擬實驗進行中利用控制變量的實驗方法不斷改變實驗工況,采集了多種工況下的模擬數(shù)據(jù),而后通過數(shù)據(jù)分析處理不斷改進相關(guān)細節(jié),得到了地熱井下?lián)Q熱器的最優(yōu)配置類型,最大程度提高了換熱器換熱效率,為工程實際應用提供了參考依據(jù)。
[Abstract]:Energy problem has become one of the main problems related to production and life since the birth of human beings. Since ancient times, human history has never lacked the record of the outbreak of war because of the improper handling of energy problems. On the basis of the continuous utilization of coal, oil, natural gas and other primary energy sources, human beings have ushered in a great prosperity and great development of society that has not been experienced in the past several thousand years, and at the same time, it has also brought about the unprecedented energy and environmental crisis in the history of thousands of years. Since the end of the 20th century, the serious consequences of energy depletion and energy abuse have forced countries all over the world to change their energy use policies, reduce the use of primary energy, and vigorously develop and study clean and non-polluting renewable energy. As a typical representative of clean and renewable energy, geothermal energy research and development of new geothermal energy utilization technology is in line with the current "energy saving and emission reduction" in China. Direct utilization of geothermal water and geothermal source heat pump system are the most widely used geothermal energy utilization technologies in China at present, but there are obvious defects in these two methods. We must study a new geothermal energy utilization technology. The geothermal well heat exchanger system overcomes the defects of the above two geothermal energy utilization forms and has the advantages of both forms. It not only realizes the advantage of the ground source heat pump without taking water, but also improves the heat transfer efficiency of the system. At present, the most direct, efficient and cost-saving research method for the heat exchanger under geothermal wells is to simulate the real convection and heat transfer process of the heat exchangers under geothermal wells by building a simulation test rig for the heat exchangers under geothermal wells. In the process of collecting data analysis and processing, draw relevant conclusions. In this paper, a whole set of geothermal well heat exchanger simulation system is set up, which is similar to the actual operation condition of the geothermal well heat exchanger, and the operating environment is approximately similar to that of the engineering practice. The variables that can be adjusted and controlled by this system are the types of simulated heat storage rocks, the caliber of geothermal wells, the diameter of copper tubes of heat exchangers, the velocity of circulating water in heat exchangers, and the intensity of flow field. The whole temperature of heat storage is simulated so as to simulate the actual operation of heat exchanger as much as possible. In the simulation experiment, the method of controlling variables is used to change the experimental conditions constantly, and the simulation data under various conditions are collected, and then the relevant details are improved continuously through data analysis and processing. The optimal configuration type of heat exchanger under geothermal well is obtained, the heat transfer efficiency of heat exchanger is improved to the maximum extent, and the reference for practical application is provided.
【學位授予單位】：河南工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU83;TK172
本文編號：2254318
[Abstract]:Energy problem has become one of the main problems related to production and life since the birth of human beings. Since ancient times, human history has never lacked the record of the outbreak of war because of the improper handling of energy problems. On the basis of the continuous utilization of coal, oil, natural gas and other primary energy sources, human beings have ushered in a great prosperity and great development of society that has not been experienced in the past several thousand years, and at the same time, it has also brought about the unprecedented energy and environmental crisis in the history of thousands of years. Since the end of the 20th century, the serious consequences of energy depletion and energy abuse have forced countries all over the world to change their energy use policies, reduce the use of primary energy, and vigorously develop and study clean and non-polluting renewable energy. As a typical representative of clean and renewable energy, geothermal energy research and development of new geothermal energy utilization technology is in line with the current "energy saving and emission reduction" in China. Direct utilization of geothermal water and geothermal source heat pump system are the most widely used geothermal energy utilization technologies in China at present, but there are obvious defects in these two methods. We must study a new geothermal energy utilization technology. The geothermal well heat exchanger system overcomes the defects of the above two geothermal energy utilization forms and has the advantages of both forms. It not only realizes the advantage of the ground source heat pump without taking water, but also improves the heat transfer efficiency of the system. At present, the most direct, efficient and cost-saving research method for the heat exchanger under geothermal wells is to simulate the real convection and heat transfer process of the heat exchangers under geothermal wells by building a simulation test rig for the heat exchangers under geothermal wells. In the process of collecting data analysis and processing, draw relevant conclusions. In this paper, a whole set of geothermal well heat exchanger simulation system is set up, which is similar to the actual operation condition of the geothermal well heat exchanger, and the operating environment is approximately similar to that of the engineering practice. The variables that can be adjusted and controlled by this system are the types of simulated heat storage rocks, the caliber of geothermal wells, the diameter of copper tubes of heat exchangers, the velocity of circulating water in heat exchangers, and the intensity of flow field. The whole temperature of heat storage is simulated so as to simulate the actual operation of heat exchanger as much as possible. In the simulation experiment, the method of controlling variables is used to change the experimental conditions constantly, and the simulation data under various conditions are collected, and then the relevant details are improved continuously through data analysis and processing. The optimal configuration type of heat exchanger under geothermal well is obtained, the heat transfer efficiency of heat exchanger is improved to the maximum extent, and the reference for practical application is provided.
【學位授予單位】：河南工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU83;TK172
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，本文編號：2254318
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