【作者】 张龙；

【导师】 吴志湘； 邓保顺；

【作者基本信息】 西安工程大学 ， 建筑与土木工程（专业学位）， 2016， 硕士

【摘要】 相关利用地热能供暖的技术多是直接抽取地下热水,会造成地面沉降、地下热水无法回灌和二次污染等问题。超长重力热管提取深层地热技术具有安全可靠、保护地下水、无污染等特点可以避免产生上述问题,而此技术大多以专利的形式出现,基础理论有待深入研究。本文对超长重力热管提取深层地热技术进行理论分析和应用探讨,为今后此技术的有效利用提供一定的依据。陕西省某能源公司根据此技术专利搭建了热管试验井装置,作者针对现场热管试验井进行理论和实测数据分析,找出影响超长重力热管传热性能的因素,然后主要通过对热管井结构方面的改进,提高其传热性能。最后对热管试验井结构和工质方面作了进一步的设想。本文结合常规重力热管的实验经验和理论分析,可知现场热管试验井不受常规传热极限的影响,计算出充液率取10%时比较适合现场热管试验井。通过分析可知蒸发段液池部分的平均换热系数随管径增大而减小,现场热管试验井的管径过大,制约着其传热性能。其次,通过计算得出蒸汽流动阻力仅为561.7Pa,理论上得出蒸汽流可以流动到重力热管的顶端,但由于初试验中重力热管的传输段(绝热段)没有任何保温措施,导致蒸汽进入换热器之前已全部沿途凝结,对此进行了三次改进试验:第一次改进试验中通过设置分流管和管段两端附加铁丝网芯,观察到有少量的凝结水产生;第二次改进试验中通过设置套管,实测并计算得到水池侧最大换热量为174k W;第三次改进试验中通过设置导管,实测并计算得到水池侧最大换热量为190k W。最后,从管壁内表面工艺、蒸发段和传输段结构、工质选择等方面对热管试验井做了进一步的设想,为此技术后续研究做好铺垫。更多还原

【Abstract】 Related to use of geothermal energy heating technology is extracting underground hot water directly,which cause some issues land subsidence,underground hot water to recharge and secondary pollution.Over-long gravity heat pipe extract the deep geothermal technology has the characteristics of safe and reliable,groundwater protection,no pollution can avoid to produce problems,but the technology mostly in the form of patents, the basic theory to be in-depth study.In this paper, the over-long gravity heat pipe through theoretical analysis and extraction of deep geothermal technology application,effective use of this technology to provide a certain basis in the future.According to the technology patent built a heat pipe test by a energy company,the author aimed at the heat pipe test theory and experimental data analysis,find out the influence factors of the gravity heat pipe heat wells of transfer performance,then mainly through to the heat pipe wells structure improvements,improve the heat transfer performance.Finally,the heat pipe test wells make a further idea structure and the working medium.In this paper,combined with the conventional gravity heat pipe experiment experience and theoretical analysis,the heat pipe test wells is not affected by the conventional heat transfer limit,calculate the charging rate is 10%,when is suitable for heat pipe in site test wells;Through the analysis on liquid pool in evaporation part of the average heat transfer coefficient decreases with increasing diameter,the diameter is too big,the heat pipe test wells restricts its heat transfer performance.In the second,the flow resistance is calculated only 561.7Pa.It is concluded that the steam flow can flow to the ground top,but due to gravity heat pipe heat transfer in the test in the early period of no heat preservation measures,led to the steam is condensed into the heat exchanger has been all along the way.To improve the test three times:the first improvement experiment by setting the shunt pipe and additional wire core on both ends of the pipe section,observed that a small amount of water.The second improved test by settingthe casing,the measured and calculated pool side maximum capacity is 174 k W;Third to improve experiment by setting the casing,the measured and calculated the pool side maximum capacity is 190 k W.Finally,from the inside pipe wall surface and heat transfer process,absorption structure,choice of working medium for heat pipe test wells,further the application of this technology for the future.更多还原