Road surface snow melting system based on geothermal sleeve type heat exchange

Abstract

The invention discloses a pavement snow melting system based on geothermal sleeve type heat exchange. The pavement snow melting system comprises a geothermal sleeve type heat exchange system and a circulating pipeline, the circulating pipeline is filled with heat exchange liquid; the geothermal sleeve type heat exchange system comprises an outer side buried pipe, an inner buried pipe, a blowout preventer and a well lid. The blowout preventer is located at the bottom of the geothermal deep well. The outer side buried pipe is arranged at the top of the blowout preventer; the inner buried pipe is located in the outer buried pipe, and a gap is reserved between the bottom end of the inner buried pipe and the top end of the blowout preventer. One port of the circulation pipeline is connected with a hot liquid pipeline, the hot liquid pipeline is provided with a hot liquid circulation pump, and the hot liquid pipeline penetrates through the well lid and is communicated with the internal buried pipe; the other port of the circulation pipeline is connected with a cold liquid pipeline, and the cold liquid pipeline penetrates through the well lid and extends into the space between the outer wall of the inner buried pipe and the inner wall of the outer buried pipe. Geothermal energy exchanges heat with the road through the heat exchange liquid, and energy-saving and environment-friendly road rapid snow melting is achieved.

Description

Technical Field

[0001] The present invention relates to the cross - technical field of new energy and transportation infrastructure, and particularly to a road snow - melting system based on geothermal sleeve heat exchange. Background Art

[0002] In cold or severe cold regions, the problem of road icing and snow accumulation seriously threatens traffic safety. Traditional solutions such as electric heating and chemical snow - melting agents have defects such as high energy consumption, environmental pollution, and high maintenance costs. For example, electric heating systems consume a large amount of electricity, while chemical snow - melting agents (such as chlorides) are prone to corrode road facilities and pollute soil and groundwater.

[0003] With the advancement of the global energy transition, geothermal energy, as a clean and stable renewable energy, has gradually attracted attention in the field of transportation infrastructure. Although geothermal resources are widely distributed in China, the existing technologies have not fully explored their application potential in the transportation field. For example, although conventional geothermal deep wells can provide a stable heat source, there is still a lack of a systematic solution for efficiently converting it into the heat energy required for road snow - melting and ice - thawing. Summary of the Invention

[0004] The purpose of the present invention is to provide a road snow - melting system based on geothermal sleeve heat exchange to solve the problems raised in the above - mentioned background art.

[0005] To achieve the above - mentioned purpose, the present invention provides the following solutions: A road snow - melting system based on geothermal sleeve heat exchange, comprising: a geothermal sleeve heat - exchange system installed in a geothermal deep well and a circulation pipeline laid inside the road; The circulation pipeline is filled with a heat - exchange liquid; The geothermal sleeve heat - exchange system includes an outer buried pipe, an inner buried pipe, a well - sealing device, and a well cover; The well - sealing device is located at the bottom of the geothermal deep well; The outer buried pipe is laid on top of the well - sealing device, and the well - sealing device plugs the bottom port of the outer buried pipe; The inner buried pipe is located inside the outer buried pipe, and there is a gap between the bottom end of the inner buried pipe and the top end of the well - sealing device; The well cover covers the tops of the outer buried pipe and the inner buried pipe; One port of the circulation pipeline is connected to a hot - liquid pipeline, and the hot - liquid pipeline is provided with a hot - liquid circulation pump. The hot - liquid pipeline passes through the well cover and is connected to the inner buried pipe; The other port of the circulation pipeline is connected to a cold - liquid pipeline. The cold - liquid pipeline passes through the well cover and extends into the space between the outer wall of the inner buried pipe and the inner wall of the outer buried pipe.

[0006] Furthermore, it further includes an independent temperature control module, and the independent temperature control module includes a PLC controller, a road temperature sensor, a liquid flow rate sensor, and a liquid temperature sensor; The road temperature sensor is installed inside the road, the liquid flow rate sensor is arranged on the hot liquid pipeline at the outlet position of the hot liquid circulation pump, and the liquid temperature sensor is arranged on the inner side wall of the internal buried pipe.

[0007] Furthermore, the circulating pipeline is arranged inside the road in a serpentine bending structure form.

[0008] Furthermore, a cement sheath for well cementing is built on the circumferential side wall of the geothermal deep well, and the outer wall of the outer buried pipe is closely attached to the inner wall of the cement sheath for well cementing.

[0009] Furthermore, the diameter of the wellhead seal is greater than or equal to the outer diameter of the cement sheath for well cementing; the diameter of the well cover is greater than or equal to the outer diameter of the cement sheath for well cementing.

[0010] It can be seen from the above technical solutions that, compared with the prior art, the beneficial effects of the present invention are as follows: 1. The road snow melting technical solution proposed by the present invention is applicable to road snow melting work in cold and severe cold climate regions of our country, and can effectively solve the problems of road icing and snow accumulation caused by low temperature environment, ensuring road traffic safety and smoothness.

[0011] 2. Using the geothermal casing as the energy supply device to form the main heat exchange part, different from the traditional road snow melting and ice melting methods, the present invention uses geothermal energy as the energy source, providing an innovative new energy road solution.

[0012] 3. Using geothermal energy as the energy source, the geothermal casing and the materials used for it can all use green environmental protection materials, which can meet the requirements of sustainable development and have no pollution to the environment. At the same time, due to the wide and sustainable utilization of geothermal energy resources, and the relatively mature geothermal casing technology and low cost. Therefore, in the face of large-scale road temperature control requirements, the snow melting solution of the present invention will have lower operating costs than traditional electric heating or chemical snow melting methods, and can greatly reduce road maintenance costs, realizing an efficient, environmentally friendly, and economical road snow melting solution.

[0013] 4. It can make full use of geothermal energy resources in our country, contribute to the sustainable development of our country in the field of transportation infrastructure, and further promote the transformation of traditional energy and the development of new energy in our country. Description of the Drawings

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic diagram of the overall layout of the road snow melting system based on geothermal casing heat exchange in the first embodiment of the present invention; Figure 2 It is a schematic diagram of the overall layout of the road snow melting system based on geothermal casing heat exchange in the first embodiment of the present invention after removing the road surface; Figure 3 It is a schematic diagram of the structure of the geothermal casing heat exchange system in the first embodiment of the present invention; Figure 4 It is a schematic diagram of the overall layout of the road snow melting system based on geothermal casing heat exchange in the second embodiment of the present invention after removing the road surface.

[0016] Explanation of reference numerals: 1. Road; 2. Circulation pipeline; 3. Geothermal casing heat exchange system; 31. Outer buried pipe; 32. Inner buried pipe; 33. Well capping device; 34. Manhole cover; 4. Hot liquid pipeline; 5. Hot liquid circulation pump; 6. Cold liquid pipeline; 7. Cement lining for well cementing; 8. Return liquid pipeline; 9. Return liquid circulation pump. Detailed implementation manners

[0017] The following will further describe in detail the specific implementation manners of the present invention in combination with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0018] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0019] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0020] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0021] In order to better understand the purpose, structure, and function of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Embodiment 1 Please refer to the attached Figures 1-3 , a road snow melting system based on geothermal casing heat exchange provided in this embodiment includes: a geothermal casing heat exchange system 3 installed in a geothermal deep well and a circulation pipeline 2 laid inside a road 1; The circulation pipeline 2 is filled with a heat exchange liquid; The geothermal casing heat exchange system 3 includes an outer buried pipe 31, an inner buried pipe 32, a well sealer 33, and a manhole cover 34; The well sealer 33 is located at the bottom of the geothermal deep well; The outer buried pipe 31 is laid on top of the well sealer 33, and the well sealer 33 seals the bottom port of the outer buried pipe 31; The inner buried pipe 32 is located inside the outer buried pipe 31, and there is a gap between the bottom end of the inner buried pipe 32 and the top end of the well sealer 33; The manhole cover 34 covers the tops of the outer buried pipe 31 and the inner buried pipe 32; One port of the circulation pipeline 2 is connected to a hot liquid pipeline 4. The hot liquid pipeline 4 is provided with a hot liquid circulation pump 5. The hot liquid pipeline 4 penetrates through the manhole cover 34 and is communicated with the inner buried pipe 32; The other port of the circulation pipeline 2 is connected to a cold liquid pipeline 6. The cold liquid pipeline penetrates through the manhole cover 34 and extends into the space between the outer wall of the inner buried pipe 32 and the inner wall of the outer buried pipe 31.

[0023] Specifically, the bottom end of the inner buried pipe 32 is 4 to 5 m away from the well sealer 334.

[0024] Specifically, the interior of the internal buried pipe 32 forms a water supply channel, and the space between the outer wall of the internal buried pipe 32 and the inner wall of the outer buried pipe 31 forms a water replenishment channel. The gap between the bottom ends of the internal buried pipe 32 and the outer buried pipe 31 and the top end of the well sealing device 33 constitutes a heat flow exchange area. When the hot liquid circulation pump 5 is started, it will drive the heat exchange liquid filled in the circulation pipeline 2 to flow through the circulation pipeline 2, the cold liquid pipeline 6, the water replenishment channel, the heat flow exchange area, the water supply channel, the hot liquid pipeline 4 in sequence, and finally return to the circulation pipeline 2 to circulate again. When the heat exchange liquid passes through the heat flow exchange area, it can absorb geothermal heat and increase in temperature. When flowing through the circulation pipeline 2, it exchanges heat with the road 1, causing the road 1 to increase in temperature, and then melting the snow on the road 1. The heat exchange liquid in the circulation pipeline 2 is cooled and then circulates back to the heat flow exchange area for heat exchange and temperature increase again. Repeating this process can effectively solve the problem of road icing and snow accumulation caused by low-temperature environments, ensuring the traffic safety and smoothness of the road 1.

[0025] In addition, the road snow melting system based on geothermal sleeve heat exchange further includes an independent temperature control module. The independent temperature control module includes a PLC controller, a road 1 temperature sensor, a liquid flow rate sensor, and a liquid temperature sensor. The road 1 temperature sensor is installed inside the road 1, the liquid flow rate sensor is arranged on the hot liquid pipeline 4 at the outlet position of the hot liquid circulation pump 5, and the liquid temperature sensor is arranged on the inner side wall of the internal buried pipe 32, 2 - 3 m away from the top end.

[0026] Specifically, after adding the independent temperature control module, the PLC controller can receive the road 1 temperature information detected by the road 1 temperature sensor, the flow rate information of the heat exchange liquid detected by the liquid flow rate sensor, and the temperature information of the heat exchange liquid in the water supply channel detected by the liquid temperature sensor, and then make a comprehensive judgment based on this information, so that the PLC controller controls the working condition of the hot liquid circulation pump 5 to achieve independent road 1 temperature control.

[0027] In addition, further optimize the technical solution by arranging the circulation pipeline 2 in a serpentine bent structure inside the road 1 to increase the contact area between the circulation pipeline 2 and the road 1 and improve the heat exchange effect and efficiency.

[0028] Further optimize the technical solution by building a cement casing lining 7 on the circumferential side wall of the geothermal deep well, and the outer wall of the outer buried pipe 31 is closely attached to the inner wall of the cement casing lining 7.

[0029] It should be noted that the diameter of the well sealing device 33 is greater than or equal to the outer diameter of the cement casing lining 7; the diameter of the well cover 34 is greater than or equal to the outer diameter of the cement casing lining 7.

[0030] It should be noted that the cement casing lining 7 is in direct contact with the soil or surrounding rock and extends underground to a depth that meets the requirements of geothermal heat exchange.

[0031] Example Two A road snow melting system based on geothermal casing heat exchange provided in this embodiment is different from that in Example One in that this embodiment includes multiple groups of geothermal casing heat exchange systems 3, while only one group of geothermal casing heat exchange systems 3 is arranged in Example One.

[0032] Specifically, the solution of this embodiment is that there are N (N≥2) geothermal deep wells along the direction of the road 1, and a set of geothermal casing heat exchange system 3 is arranged in each of these N geothermal deep wells. The N geothermal deep wells can be arranged in sequence on the same side of the road 1, or can be arranged on both sides of the road 1 in a sequential staggered manner, such as the Figure 4 layout method shown in the appendix, and this embodiment precisely uses the sequential staggered layout method for illustration.

[0033] Taking the geothermal casing heat exchange system 3 at one end of the road 1 as the first group of geothermal casing heat exchange systems 3, and then sequentially defining the second group of geothermal casing heat exchange systems 3, the third group of geothermal casing heat exchange systems 3 in the direction towards the other end of the road 1 until the Nth group of geothermal casing heat exchange systems 3 (which can also be defined as the last group of geothermal casing heat exchange systems 3) at the other end of the road 1.

[0034] One end of the circulation pipeline 2 is provided with a hot liquid interface, and the other end is provided with a cold liquid interface. There are also N - 1 hot liquid interfaces and N - 1 cold liquid interfaces additionally arranged on the circulation pipeline 2, and the hot liquid interfaces are not adjacent to each other, and the cold liquid interfaces are not adjacent to each other.

[0035] With such a setting method, a better heat exchange effect can be achieved to adapt to the longer road 1. The specific connection method is as follows: Connect the hot liquid pipeline 4 connected to the hot liquid interface at one end of the circulation pipeline 2 to the internal buried pipe 32 of the first group of geothermal casing heat exchange systems 3. The specific connection method is the same as that in Example One, and a hot liquid circulation pump 5 is also provided.

[0036] Then connect the interface (i.e., the cold liquid interface) adjacent to the hot liquid interface at one end of the circulation pipeline 2 to the cold liquid pipeline 6 of the second group of geothermal casing heat exchange systems 3, and then connect the hot liquid pipeline 4 of the second group of geothermal casing heat exchange systems 3 to the next hot liquid interface on the circulation pipeline 2. Again, supply high-temperature heat exchange liquid into the circulation pipeline 2, and so on, until the cold liquid interface arranged at the other end of the circulation pipeline 2 is connected to the water replenishing channel of the first group of geothermal casing heat exchange systems 3 through the return liquid pipeline 8.

[0037] The above connection method also forms a circulating heat exchange system with head-to-tail connection, which is adapted to the long-distance road 1 and can effectively avoid the poor heat exchange effect caused by only one set of geothermal casing heat exchange system 3 (because the heat exchange capacity of one set of geothermal casing heat exchange system 3 is limited).

[0038] In addition, since the cold liquid interface provided at the other end of the circulating pipeline 2 is far from the water replenishing channel of the first set of geothermal casing heat exchange system 3, the span of the liquid return pipeline 8 is relatively large. A liquid return circulation pump 9 can be arranged on the liquid return pipeline 8, and its function is similar to that of the hot liquid circulation pump 5.

[0039] Embodiment III This embodiment provides a method for autonomous temperature control of the road surface by the road surface snow melting system based on geothermal casing heat exchange in Embodiment II (it should be noted that this embodiment uses a total of 10 sets of geothermal casing heat exchange systems 3, and of course, other numbers of geothermal casing heat exchange systems 3 can also be used), including the following steps: (1) On both sides of the road 1 that needs temperature control, one set of geothermal casing heat exchange system 3 is arranged every 200 meters. The arrangement positions of multiple sets of geothermal casing heat exchange systems 3 are arranged in a cross pattern along both sides of the road 1. Five sets of geothermal casing heat exchange systems 3 are arranged on each side, and a total of 10 sets of heat exchange systems form a geothermal casing temperature control section, and the length of the temperature control section is 1000 meters.

[0040] (2) For each geothermal casing heat exchange system 3, first, construct the underground part of the geothermal casing heat exchange system 3 at the arrangement location, extend the outer buried pipe 31 underground to a position that meets the requirements of geothermal heat exchange, pour the well-fixing cement lining 7 outside the outer buried pipe 31, so that the well-fixing cement lining 7 is close to the soil or surrounding rock, which is used to reinforce the well wall and reduce the thermal resistance to improve the heat transfer efficiency of the heat exchange system. Pour the well-sealing device 33 at the bottom of the well-fixing cement lining 7 and the outer buried pipe 31 to ensure effective water isolation between the geothermal casing heat exchange system 3 and the outside; install the inner buried pipe 32 at the center of the cylinder formed by the well-fixing cement lining 7 and the outer buried pipe 31, and extend the bottom of the inner buried pipe 32 underground to a position 4 - 5 m away from the well-sealing device 33; arrange the liquid flow rate sensor and the liquid temperature sensor inside the inner buried pipe 32 and the outer buried pipe 31 at a position 2 - 3 m away from the top to monitor the flow rate and temperature of the upper water flow and the makeup water flow; connect the hot liquid pipeline 4 to the upper water channel; connect the cold liquid pipeline 6 to the makeup water channel; connect the hot liquid circulation pump 5 to the hot liquid pipeline 4; connect the PLC controller to the water body flow rate sensor and the water body temperature sensor. After the installation is completed, cover the manhole cover 34 on the top of the geothermal casing heat exchange system 3.

[0041] (3) Connect the 10 groups of geothermal casing heat exchange systems 3 to the circulating pipeline 2 inside the road 1 in the manner of Embodiment 2. After the connection is completed, install the road 1 temperature sensor; finally, lay the asphalt pavement according to relevant standards; connect the PLC control system to all the hot liquid circulation pumps 5, the return liquid circulation pumps 9 and the road 1 temperature sensor.

[0042] (4) When the road surface snow melting system based on geothermal casing heat exchange monitors the weather changes, it will make a forecast for the cooling and rain and snow weather, and will automatically turn on the entire system in advance; after the system runs, the PLC controller will control all the hot liquid circulation pumps 5 and the return liquid circulation pumps 9 in the current section to work; for each geothermal casing heat exchange system 3, the heat exchange liquid will enter the water replenishing channel through the cold liquid pipeline 6. During the process of flowing from the ground surface to the heat flow exchange area, the heat exchange liquid will gradually absorb geothermal energy, and finally complete the geothermal exchange process in the heat flow exchange area and become high-temperature heat exchange liquid; then the high-temperature heat exchange liquid will rise to the ground surface through the upper water channel and flow through the circulating pipeline 2, and become low-temperature heat exchange liquid after releasing heat in the circulating pipeline 2 and flow into the next cycle; during the process of heating the road surface, various sensors will transmit all the real-time signals of the sensors to the PLC controller through signal transmission. The PLC controller will independently analyze and judge the road surface heating power, and precisely control the operating power of all the hot liquid circulation pumps 5 and the return liquid circulation pumps 9, and increase or decrease the flow rate of the high-temperature heat exchange liquid in the circulating pipeline 2 according to the actual situation, so as to complete the autonomous temperature control of the road surface of the temperature control section.

[0043] The geothermal casing type autonomous temperature control road 1 system of the present invention can reach the following technical standards: (1) Calculated according to a single conventional geothermal casing deep well heating, the well depth is 3000 meters, the geothermal water is 25 °C, the cooling water is 5 °C, and the water flow is 20 m3 / h. For each temperature control section, a heating power of 4.6×106 W can be provided, which is sufficient to meet the requirements of snow melting and ice melting on the road surface of a lane with a length of 1000 meters and a width of 30 meters.

[0044] (2) Only one layer of temperature control circulating pipeline 2 is laid inside the road 1 surface, and the other construction requirements remain unchanged, which has little impact on the quality and service life of the road 1.

[0045] In this article, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A road snow melting system based on geothermal shell-and-tube heat exchange, characterized in that: include: The geothermal shell-and-tube heat exchange system installed in the ground and the circulation pipeline laid inside the road; The circulation pipeline is filled with a heat exchange liquid; The geothermal casing heat exchange system comprises an outer buried pipe, an inner buried pipe, a well sealer and a well cover; The well sealer is located at the bottom of the geothermal deep well; The outer buried pipe is arranged on the top of the well plugger, and the well plugger plugs the bottom port of the outer buried pipe; The inner buried pipe is located inside the outer buried pipe, and a gap is left between the bottom end of the inner buried pipe and the top end of the well plugging device; The manhole cover is arranged at the top of the outer buried pipe and the inner buried pipe; A hot liquid pipeline is connected to one end of the circulation pipeline, the hot liquid pipeline is provided with a hot liquid circulation pump, and the hot liquid pipeline passes through the manhole cover and is connected to the internal buried pipe; The other end of the circulation pipeline is connected to a cold liquid pipeline, and the cold liquid pipeline passes through the manhole cover and extends into the space between the outer wall of the inner buried pipe and the inner wall of the outer buried pipe.

2. A road snow melting system based on geothermal shell-and-tube heat exchange according to claim 1, characterized in that: Also included is an autonomous temperature control module, the autonomous temperature control module including a PLC controller, a road temperature sensor, a liquid flow rate sensor, and a liquid temperature sensor; The road temperature sensor is installed inside the road, the liquid flow rate sensor is arranged on the hot liquid pipeline located at the outlet of the hot liquid circulation pump, and the liquid temperature sensor is arranged on the inner wall of the internal buried pipe.

3. The road snow melting system based on geothermal shell-and-tube heat exchange according to claim 1 is characterized in that: The circulation pipeline is arranged inside the road in a serpentine bending structure.

4. The road snow melting system based on geothermal shell-and-tube heat exchange according to claim 1 is characterized in that: A cement lining is built along the circumferential side wall of the geothermal deep well, and the outer wall of the outer buried pipe is closely attached to the inner wall of the cement lining.

5. A road snow melting system based on geothermal shell-and-tube heat exchange according to claim 4, characterized in that: The diameter of the well plug is greater than or equal to the outer diameter of the cement lining; the diameter of the well cover is greater than or equal to the outer diameter of the cement lining.

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