地热井下换热器变工况运行模拟实验研究
发布时间：2018-10-05 17:55
【摘要】：能源问题自人类诞生之日起就成为了关系到生产与生活的主要问题之一,从古至今,人类历史上也从不缺乏因为能源问题处理不得当而爆发战争的记录。人类在不断利用煤炭、石油、天然气等一次能源的基础上,迎来了历史上几千年来未有的社会大繁荣大发展,同时也带来了历史上几千年未有的能源与环境危机。二十世纪末以来,能源日趋枯竭和能源滥用所带来的严重后果已经迫使世界各国改变能源利用政策,减少一次能源使用量的同时大力发展研究清洁无污染的可再生能源。地热能作为清洁可再生能源的典型代表,不断研究开发新的地热能利用技术符合我国当下“节能减排”的大主题。地热水直接利用和地埋管地源热泵系统是目前国内使用最多的地热能利用技术,但这两种方法均存在明显缺陷,我们必须着力于研究一种新的地热能利用技术。地热井下换热器系统克服了以上两种地热能利用形式的缺陷,并兼具两种形式的优势。既实现了地源热泵取热不取水的优势特点,并极大提高了系统的换热效率。当下,对于地热井下换热器研究最直接、最高效、最节约成本的研究方法,就是通过搭建地热井下换热器模拟试验台,模拟真实的地热井下换热器对流换热过程,在过程中采集数据分析处理,得出相关结论。本文通过搭建一整套地热井下换热器模拟系统,该系统与工程实际中的地热井下换热器运行情况,运行环境大致相似,通过该系统可以调节和控制的变量有模拟热储岩石的类型、模拟地热井的口径、模拟换热器铜管管径、模拟换热器中循环水的流速、模拟流场的强弱、模拟热储的整体温度等变量,使其尽可能多的模拟换热器实际运行时的各种工况。模拟实验进行中利用控制变量的实验方法不断改变实验工况,采集了多种工况下的模拟数据,而后通过数据分析处理不断改进相关细节,得到了地热井下换热器的最优配置类型,最大程度提高了换热器换热效率,为工程实际应用提供了参考依据。
[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.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU83;TK172
本文编号：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.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU83;TK172
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