CN201909483U - Induced convection device for extracting terrestrial heat through underground heat exchange - Google Patents
Induced convection device for extracting terrestrial heat through underground heat exchange Download PDFInfo
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Abstract
地下换热提取地热的诱导对流装置，主要由对流加速管(1)，开槽套管(2)和地下U型换热器(3)组成，其特征在于：对流加速管(1)和地下U型换热器(3)设置在开槽套管(2)中，形成一体式结构，其中，对流加速管(1)是两端敞开的通管，通管上端形成有若干出水小孔(11)，通管下端形成有若干进水小孔(12)，地下U型换热器(3)在对流加速管(1)的内侧，开槽套管(2)呈底部封死，顶部开口的槽结构，开槽套管(2)的下部管壁有若干开孔(21)，对流加速管(1)的上顶端超出开槽套管(2)的顶部，对流加速管(1)的下底端靠近开槽套管(2)的底部，地下U型换热器(3)的顶端超出开槽套管(2)的顶部，地下U型换热器(3)的底部靠近开槽套管(2)的底部，达到设计目的。
The induced convection device for extracting geothermal heat by underground heat exchange is mainly composed of a convection accelerating tube (1), a slotted casing (2) and an underground U-shaped heat exchanger (3). The U-shaped heat exchanger (3) is arranged in the slotted casing (2) to form an integrated structure, wherein the convection accelerating tube (1) is a through pipe with both ends open, and a number of small water outlet holes are formed on the upper end of the through pipe ( 11), a number of water inlet holes (12) are formed at the lower end of the through pipe, the underground U-shaped heat exchanger (3) is inside the convection accelerating pipe (1), the slotted casing (2) is sealed at the bottom, and the top is open groove structure, the lower pipe wall of the slotted sleeve (2) has several openings (21), the upper top of the convection acceleration tube (1) exceeds the top of the slotted sleeve (2), and the top of the convection acceleration tube (1) The lower bottom end is close to the bottom of the slotted casing (2), the top of the underground U-shaped heat exchanger (3) exceeds the top of the slotted casing (2), and the bottom of the underground U-shaped heat exchanger (3) is close to the slotted The bottom of sleeve pipe (2) reaches design purpose.
Description
技术领域technical field
本实用新型涉及地热的提取装置，尤其是地下换热提取地热的诱导对流装置。The utility model relates to a geothermal extraction device, in particular to an induced convection device for extracting geothermal heat through underground heat exchange.
背景技术Background technique
上个世纪七十年代初以来，随着石油、煤等不可再生能源的过度开采，造成了能源的极度短缺，开发利用新能源，尤其是可再生能源越来越紧迫，地热能作为一种具有广阔开发前景的新能源日益受到关注。地热能除了用于发电之外，更为大量地直接用于采暖、制冷、医疗洗浴和各种形式的工农业用热，以及水产养殖等。在世界上80多个直接利用地热的国家中，中国直接利用热地装置采热的能力已经位居全球第一。Since the early 1970s, with the excessive exploitation of non-renewable energy such as oil and coal, the extreme shortage of energy has been caused, and the development and utilization of new energy, especially renewable energy, has become more and more urgent. New energy sources with broad development prospects are attracting increasing attention. In addition to being used for power generation, geothermal energy is more directly used for heating, cooling, medical bathing, various forms of industrial and agricultural heat, and aquaculture. Among the more than 80 countries in the world that directly use geothermal energy, China ranks first in the world in terms of its ability to directly utilize geothermal devices for heat collection.
地热能系指储存在地下的干蒸汽、热水和干热岩中的热能。干热岩资源虽然在技术上最容易开发利用，但是已发现的数量估计仅为热水资源的二十分之一。另一方面，虽然干热岩中可能蕴藏有极大量的热能，可是没有提取这种能量的成熟技术，也还没有进行大规模的勘探来确定什么地方有可利用的蕴藏。因此，地热能的发展重点放在以热水为主的地热资源的开发利用上。Geothermal energy refers to thermal energy stored in dry steam, hot water and hot dry rocks underground. Although hot dry rock resources are technically the easiest to develop and utilize, the discovered quantity is estimated to be only one-twentieth of hot water resources. On the other hand, although there may be enormous amounts of thermal energy in hot dry rocks, there are no mature technologies for extracting this energy, and no large-scale exploration has been conducted to determine where the deposits are available. Therefore, the development of geothermal energy focuses on the development and utilization of geothermal resources mainly hot water.
以热水为主的地热资源按温度划分，可分为高温(＞150℃)、中温(90～150℃)、低温(＜90℃)三种类型。我国是一个以中低温地热资源为主的国家，而中低温地热资源的开采利用存在一个问题，即中低温地热井不能直接形成蒸汽将地热能量带出，传统的地热开采利用是采用地下换热器装置提取地热，地下换热器的原理是换热器内的流体，与井内从含水层流出的地热水以自然对流的方式进行热交换，而自然对流的热交换效率较低，而且成本高，不能满足人们的需求。Geothermal resources dominated by hot water can be divided into three types according to temperature: high temperature (>150°C), medium temperature (90-150°C), and low temperature (<90°C). my country is a country dominated by medium and low temperature geothermal resources, but there is a problem in the exploitation and utilization of medium and low temperature geothermal resources, that is, medium and low temperature geothermal wells cannot directly form steam to bring out geothermal energy. Traditional geothermal exploitation and utilization uses underground heat exchange. The ground heat exchanger is used to extract geothermal heat. The principle of the underground heat exchanger is that the fluid in the heat exchanger exchanges heat with the geothermal water flowing out of the aquifer in the well in a natural convection manner, and the heat exchange efficiency of natural convection is low, and the cost High, can not meet people's needs.
发明内容Contents of the invention
本实用新型的目的在于研制一种解决现有提取地热装置的设备投资高、热效率低的问题，为地下换热器增加对流加速管，形成换热介质与地热水的诱导对流，成本低，换热效率高，对环境无任何污染的地下换热提取地热的诱导对流装置。The purpose of this utility model is to develop a method to solve the problems of high equipment investment and low thermal efficiency of the existing geothermal extraction device, add a convection acceleration tube to the underground heat exchanger, form the induced convection between the heat exchange medium and the geothermal water, and the cost is low. Induced convection device for extracting geothermal heat from underground heat exchange with high heat exchange efficiency and no pollution to the environment.
本实用新型通过以下技术方案实现：The utility model is realized through the following technical solutions:
本实用新型地下换热提取地热的诱导对流装置，主要由对流加速管，开槽套管和地下U型换热器组成，其特征在于：对流加速管和地下U型换热器设置在开槽套管中，形成一体式结构，其中，对流加速管是两端敞开的通管，通管上端形成有若干出水小孔，通管下端形成有若干进水小孔，地下U型换热器在对流加速管的内侧，开槽套管呈底部封死，顶部开口的槽结构，开槽套管的下部管壁有若干开孔，开槽套管采用金属材料制作，对流加速管的管径是开槽套管内直径的一半，地下U形换热器的管径是开槽套管内直径的四分之一，对流加速管的上顶端超出开槽套管的顶部，对流加速管的下底端靠近开槽套管的底部，地下U型换热器的顶端超出开槽套管的顶部，地下U型换热器的底部靠近开槽套管的底部，达到设计目的。The utility model is an induced convection device for underground heat exchange and extraction of geothermal heat, which is mainly composed of a convection accelerating tube, a slotted casing and an underground U-shaped heat exchanger, and is characterized in that: the convective accelerating tube and the underground U-shaped heat exchanger are arranged in the grooved In the casing, an integrated structure is formed, wherein the convection accelerating tube is a through pipe with both ends open, a number of small water outlet holes are formed at the upper end of the through pipe, and a number of small water inlet holes are formed at the lower end of the through pipe, and the underground U-shaped heat exchanger is in the On the inside of the convection accelerating tube, the slotted sleeve has a groove structure with the bottom sealed and the top open. There are several openings in the lower wall of the slotted sleeve. The slotted sleeve is made of metal materials. The diameter of the convective accelerating tube is Half of the inner diameter of the slotted casing, the pipe diameter of the underground U-shaped heat exchanger is a quarter of the inner diameter of the slotted casing, the upper top of the convection accelerating tube exceeds the top of the slotted casing, and the lower bottom of the convective accelerating tube Close to the bottom of the slotted casing, the top of the underground U-shaped heat exchanger exceeds the top of the slotted casing, and the bottom of the underground U-shaped heat exchanger is close to the bottom of the slotted casing to achieve the design purpose.
在使用时，将本实用新型整体置入地热井中，开槽套管底部接近地热井底部，开槽套管上部露出水平，静水面高于对流加速管上端的出水小孔，地下U型换热器一端外接工作介质输入管，工作介质输入管端设置有增加泵，在增压泵与地下U型换热器之间设置有单向阀，地下U型换热器另一端外接工作介质输出管，工作介质输出管端设置有冷源热交换装置，然后再和增加泵接通，形成封闭式的循环系统，工作介质采用低沸点的物质，地热水在压力差作用下，从对流加速管进水小孔处进入对流加速管内，并在对流加速管内逐步上升，上升到一定高度后，地热水从对流加速管的出水小孔处涌出，涌出的地热水在重力的作用下往下流动，在往下流动时与进入到地下U型换热器中的工作介质进行热交换，此时地热水与工作介质的热交换方式为诱导对流，热交换效率相对自然对流较高，工作介质在吸收地热水的热量之后汽化，并沿地下U型换热器的另一端管道上升，到达地面的冷源热交换装置，汽态工作介质冷凝液化释放热量，液化的工作介质再泵入地下U型换热器与地热水进行热交换，这样不断的循环就形成一个地下换热提取地热的系统，达到设计目的。When in use, the utility model is put into a geothermal well as a whole, the bottom of the slotted casing is close to the bottom of the geothermal well, the upper part of the slotted casing is exposed horizontally, the static water surface is higher than the water outlet hole at the upper end of the convection acceleration tube, and the underground U-shaped heat exchange One end of the device is externally connected to the working medium input pipe, and the end of the working medium input pipe is provided with a booster pump, and a check valve is provided between the booster pump and the underground U-shaped heat exchanger, and the other end of the underground U-shaped heat exchanger is externally connected to the working medium output pipe , the end of the working medium output pipe is equipped with a cold source heat exchange device, and then connected to the increasing pump to form a closed circulation system. The working medium is a substance with a low boiling point. The water inlet hole enters the convection acceleration tube, and gradually rises in the convection acceleration tube. After rising to a certain height, the geothermal water gushes out from the water outlet hole of the convection acceleration tube. It flows downwards and exchanges heat with the working medium entering the underground U-shaped heat exchanger. At this time, the heat exchange method between the geothermal water and the working medium is induced convection, and the heat exchange efficiency is higher than that of natural convection. , the working medium vaporizes after absorbing the heat of geothermal water, and rises along the pipe at the other end of the underground U-shaped heat exchanger to reach the cold source heat exchange device on the ground. The gaseous working medium condenses and liquefies to release heat, and the liquefied working medium then Pump into the underground U-shaped heat exchanger to exchange heat with geothermal water, so that the continuous circulation forms an underground heat exchange and extraction system to achieve the design purpose.
地热水从对流加速管的进水小孔进入，在对流加速管内上升并从上端的出水小孔流出，地热水再返回底部的进水小孔形成诱导对流，使U形换热器的产热量因地热水的对流扰动而增加，实验表明，对于低渗透率的井，储热是很重要的，此时设置对流加速管可以起到增加储热的作用，从而也增加了非稳态的产热量。The geothermal water enters from the water inlet hole of the convection accelerating tube, rises in the convection accelerating tube and flows out from the upper water outlet hole, and then returns to the bottom water inlet hole to form induced convection, so that the U-shaped heat exchanger Heat production increases due to the convective disturbance of geothermal water. Experiments show that heat storage is very important for wells with low permeability. state of heat production.
诱导对流是指通过人为方式等非机械作用迫使流体沿传热表面流动产生的传热现象；自然对流是由于流体内部温度的差异而引起流体质点密度的不同，使轻者上浮而重者下沉，自然对流要考虑流体浮力的影响。对流传热是流体的宏观流动而引起的一种传热方式，诱导对流由于在外在因素的影响下，使用于传热的两种流体产生相对流动，故传热效率相对与自然对流较高。Induced convection refers to the heat transfer phenomenon in which the fluid is forced to flow along the heat transfer surface through artificial means and other non-mechanical effects; natural convection is the difference in the density of fluid particles caused by the difference in the internal temperature of the fluid, so that the light ones float up and the heavy ones sink , natural convection should consider the influence of fluid buoyancy. Convective heat transfer is a heat transfer method caused by the macroscopic flow of fluids. Induced convection causes the two fluids used for heat transfer to flow relative to each other under the influence of external factors, so the heat transfer efficiency is relatively higher than that of natural convection.
本实用新型具有以下优点：The utility model has the following advantages:
1、经由本实用新型的实施，结构简单、紧凑，充分利用空间资源。1. Through the implementation of the utility model, the structure is simple and compact, and space resources are fully utilized.
2、经由本实用新型的实施，能提取中低温地热资源，地热水与工作介质的热交换效率较高。2. Through the implementation of the utility model, medium and low temperature geothermal resources can be extracted, and the heat exchange efficiency between the geothermal water and the working medium is relatively high.
3、经由本实用新型的实施，利用可再生的地热资源，在整个系统过程中，没有污染物的排放，符合国家节能减排的政策。3. Through the implementation of the utility model, renewable geothermal resources are used, and no pollutants are discharged in the whole system process, which is in line with the national policy of energy conservation and emission reduction.
4、经由本实用新型的实施，由于没有抽取地下水，能维持地下水的完全封闭，不需要考虑地下水是否有充足的供应以及地下水的耗散。4. Through the implementation of the utility model, since the groundwater is not pumped, the groundwater can be kept completely sealed, and there is no need to consider whether there is sufficient supply of groundwater and the dissipation of groundwater.
附图说明Description of drawings
下面结合附图对本实用新型作进一步说明，但不作为对本实用新型的限定。The utility model will be further described below in conjunction with the accompanying drawings, but not as a limitation of the utility model.
图1是本实用新型的结构原理示意图。Fig. 1 is the structural principle schematic diagram of the utility model.
在图中，1对流加速管、11出水小孔、12进水小孔、2开槽套管、21开孔、3地下U型换热器、4静水面In the figure, 1 convection accelerating tube, 11 water outlet hole, 12 water inlet hole, 2 slotted casing, 21 opening, 3 underground U-shaped heat exchanger, 4 static water surface
具体实施方式Detailed ways
图1中所示，本实用新型地下换热提取地热的诱导对流装置，主要由对流加速管1，开槽套管2和地下U型换热器3组成，其特征在于：对流加速管1和地下U型换热器3设置在开槽套管2中，形成一体式结构，其中，对流加速管1是两端敞开的通管，通管上端形成有若干出水小孔11，通管下端形成有若干进水小孔12，地下U型换热器3在对流加速管1的内侧，开槽套管2呈底部封死，顶部开口的槽结构，开槽套管2的下部管壁有若干开孔21，开槽套管2采用金属材料制作，对流加速管1的管径是开槽套管2内直径的一半，地下U形换热器3的管径是开槽套管2内直径的四分之一，对流加速管1的上顶端超出开槽套管2的顶部，对流加速管1的下底端靠近开槽套管2的底部，地下U型换热器3的顶端超出开槽套管2的顶部，地下U型换热器3的底部靠近开槽套管2的底部，达到设计目的。As shown in Fig. 1, the induced convection device for extracting geothermal heat by underground heat exchange of the utility model is mainly composed of a
在图1中，对流加速管1中的箭头所示方向是地热水的水流方向，地下U型换热器3中的箭头所示方向是工作介质的运动方向。In FIG. 1 , the direction indicated by the arrow in the
在使用时，将本实用新型整体置入地热井中，开槽套管2底部接近地热井底部，开槽套管2上部露出静水面4，静水面4高于对流加速管1上端的出水小孔11，地下U型换热器3一端外接工作介质输入管，工作介质输入管端设置有增加泵，在增压泵与地下U型换热器3之间设置有单向阀，地下U型换热器3另一端外接工作介质输出管，工作介质输出管端设置有冷源热交换装置，然后再和增加泵接通，形成封闭式的循环系统，工作介质采用低沸点的乙二醇，地热水在压力差作用下，从对流加速管1进水小孔12处进入对流加速管1内，并在对流加速管1内逐步上升，上升到一定高度后，地热水从对流加速管1的出水小孔11处涌出，涌出的地热水在重力的作用下往下流动，在往下流动时与进入到地下U型换热器3中的工作介质乙二醇进行热交换，此时地热水与工作介质乙二醇的热交换方式为诱导对流，热交换效率相对自然对流较高，工作介质乙二醇在吸收地热水的热量之后汽化，并沿地下U型换热器3的另一端管道上升，到达地面的冷源热交换装置，汽态工作介质乙二醇冷凝液化释放热量，液化的工作介质乙二醇再泵入地下U型换热器3与地热水进行热交换，这样不断的循环就形成一个地下换热提取地热的系统，达到设计目的。When in use, the utility model is put into a geothermal well as a whole, the bottom of the slotted casing 2 is close to the bottom of the geothermal well, the upper part of the slotted casing 2 exposes the static water surface 4, and the static water surface 4 is higher than the water outlet hole at the upper end of the
本实用新型的实施，结构简单、紧凑，充分利用空间资源，成本低，换热效率高，绿色环保，广泛应用于中低温地热井的地下换热提取地热的诱导对流装置领域。The implementation of the utility model has the advantages of simple and compact structure, full use of space resources, low cost, high heat exchange efficiency, and environmental protection, and is widely used in the field of induced convection devices for extracting geothermal heat from underground heat exchange in medium and low temperature geothermal wells.
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| CN2010206854525U CN201909483U (en) | 2010-12-28 | 2010-12-28 | Induced convection device for extracting terrestrial heat through underground heat exchange |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104265242A (en) * | 2014-08-09 | 2015-01-07 | 周成杰 | Terrestrial heat extraction method of geothermal well |
| CN106642766A (en) * | 2017-01-22 | 2017-05-10 | 浙江陆特能源科技股份有限公司 | Closed type inner well circulating heat exchange tube |
| CN107062665A (en) * | 2017-04-18 | 2017-08-18 | 长沙紫宸科技开发有限公司 | A kind of carbon dioxide energy storage equipment of accumulation geothermal energy |
| CN109612323A (en) * | 2018-12-06 | 2019-04-12 | 湖南达道新能源开发有限公司 | A kind of geothermal well deep hole heat exchanger |
| CN109668344A (en) * | 2018-12-06 | 2019-04-23 | 湖南达道新能源开发有限公司 | A kind of network-in-dialing formula geothermal energy quarrying apparatus |
-
2010
- 2010-12-28 CN CN2010206854525U patent/CN201909483U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104265242A (en) * | 2014-08-09 | 2015-01-07 | 周成杰 | Terrestrial heat extraction method of geothermal well |
| CN104265242B (en) * | 2014-08-09 | 2016-09-07 | 周成杰 | The ground thermal extraction method of geothermal well |
| CN106642766A (en) * | 2017-01-22 | 2017-05-10 | 浙江陆特能源科技股份有限公司 | Closed type inner well circulating heat exchange tube |
| CN107062665A (en) * | 2017-04-18 | 2017-08-18 | 长沙紫宸科技开发有限公司 | A kind of carbon dioxide energy storage equipment of accumulation geothermal energy |
| CN109612323A (en) * | 2018-12-06 | 2019-04-12 | 湖南达道新能源开发有限公司 | A kind of geothermal well deep hole heat exchanger |
| CN109668344A (en) * | 2018-12-06 | 2019-04-23 | 湖南达道新能源开发有限公司 | A kind of network-in-dialing formula geothermal energy quarrying apparatus |
| CN109668344B (en) * | 2018-12-06 | 2020-09-25 | 湖南达道新能源开发有限公司 | Network communication type geothermal energy exploitation device |
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