Carbon dioxide ground source type geothermal road temperature control system

Abstract

The invention relates to a carbon dioxide ground source type geothermal road temperature control system, which belongs to the technical field of cooling and heating systems and comprises a carbon dioxide geothermal shaft system and a road system. The carbon dioxide geothermal shaft system comprises a gas feeding shaft system and a gas supplementing shaft system, the road system comprises a temperature control road, a temperature control circulation pipeline and a road temperature sensor, and the two ends of the temperature control circulation pipeline are connected to the gas feeding shaft system and the gas supplementing shaft system respectively. The road temperature sensor is arranged on the temperature control circulation pipeline, and the temperature control circulation pipeline is embedded in the temperature control road. According to the carbon dioxide ground source type geothermal road temperature control system, geothermal energy is adopted as energy, high-temperature carbon dioxide is utilized, the efficient and environment-friendly road surface temperature control system suitable for a large-scale road is developed, and the requirement of sustainable development is met.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling and heating systems, and in particular to a carbon dioxide ground-source geothermal road temperature control system. Background Art

[0002] With the increasing demand for renewable energy, geothermal energy, as a clean and stable form of energy, has become one of the important directions of global energy transformation.

[0003] However, in cold or severe climate zones, the problem of ice and snow on the road caused by low temperature environment will seriously threaten road traffic safety and traffic efficiency. The current mainstream solutions still have significant limitations. For example, in traditional de-icing and snow melting technology, mechanical de-icing relies on manual or mechanical equipment, which consumes a lot of manpower and material resources, is inefficient, and is difficult to cope with sudden extreme weather; although chemical de-icing agents can lower the freezing point, long-term use will cause damage to the environment or the road surface; the electric heating system heats the road surface by burying resistance wires, but the energy consumption is extremely high and is not suitable for large-scale application on long-distance roads.

[0004] Existing geothermal energy applications in the field of road temperature control are mostly closed ground source heat pump systems, which are often limited by geological conditions. Conventional heat exchange efficiency decays as the temperature difference decreases, making it difficult to meet the needs of rapid snow melting in extremely cold regions.

[0005] In view of the above-mentioned technical phenomena, the inventors aim to use high-temperature carbon dioxide to develop a road surface temperature control system that is efficient, environmentally friendly and suitable for large-scale roads. Summary of the invention

[0006] The purpose of the present invention is to provide a carbon dioxide ground-source geothermal road temperature control system, which is based on carbon dioxide geothermal circulation technology, through a carbon dioxide geothermal shaft system, pipeline layout and intelligent control method, to break through the bottleneck of existing technology and provide a new solution for the green and low-carbonization of transportation infrastructure.

[0007] The present invention provides a carbon dioxide ground-source geothermal road temperature control system, which adopts the following technical solutions: A carbon dioxide ground-source geothermal road temperature control system, comprising: A carbon dioxide geothermal shaft system, the carbon dioxide geothermal shaft system comprising an upper gas shaft system and an air supplement shaft system, the upper gas shaft system is used to transport high-temperature carbon dioxide, and the air supplement shaft system is used to transport cooling carbon dioxide; The road system includes a temperature-controlled road, a temperature-controlled circulation pipeline and a road temperature sensor. The temperature-controlled circulation pipeline is connected to the upper gas shaft system and the gas supplement shaft system. The road temperature sensor is arranged on the temperature-controlled circulation pipeline. The temperature-controlled circulation pipeline is buried inside the temperature-controlled road.

[0008] Preferably, the temperature control circulation pipeline and the upper gas shaft system are connected to an upper gas pipeline, and the temperature control circulation pipeline and the gas supplement shaft system are connected to an gas supplement pipeline; The gas supply pipeline is provided with a condenser and a compressor arranged along the gas flow direction.

[0009] Preferably, the carbon dioxide geothermal shaft system, road system, condenser and compressor are electrically connected to a temperature control system.

[0010] Preferably, the gas well system includes a gas well cementing pit, a gas buried pipe, a gas control valve, a gas temperature and pressure sensor and a well cover; The bottom of the upper gas cementing pit extends to the geothermal heat exchange point. The upper gas buried pipe is arranged in the upper gas cementing pit. The upper gas buried pipe is used to transport high-temperature carbon dioxide. The upper gas buried pipe is connected to the upper gas pipeline. The circumferential side wall of the upper gas buried pipe is in a fit with the circumferential inner wall of the upper gas cementing pit. The upper gas control valve and the upper air and pressure sensor are arranged inside the upper gas buried pipe near the top, and the manhole cover is arranged at the top of the upper gas cementing pit.

[0011] Preferably, the gas supply shaft system includes a gas supply cementing pit, a gas supply buried pipe, a gas supply temperature and pressure sensor and a well cover; The bottom of the air supply cementing pit extends to the geothermal heat exchange point, the air supply buried pipe is arranged in the air supply cementing pit, the air supply buried pipe is used to transport cooling carbon dioxide, the air supply buried pipe is connected to the air supply pipeline, the circumferential side wall of the air supply buried pipe is in a fit with the circumferential inner wall of the air supply cementing pit, the air supply temperature and pressure sensor is arranged inside the air supply buried pipe near the top, and the manhole cover is arranged at the top of the air supply cementing pit.

[0012] Preferably, the temperature control circulation pipeline is distributed in a W shape.

[0013] Preferably, the carbon dioxide geothermal shaft system is provided in a plurality of groups, and each group of the carbon dioxide geothermal shaft system is respectively connected to a temperature control circulation pipeline.

[0014] Preferably, the temperature control system is electrically connected to a plurality of carbon dioxide geothermal shaft systems.

[0015] In summary, the present invention includes the following beneficial technical effects: 1. The present application includes a carbon dioxide geothermal shaft system and a road system. The upper air shaft system in the carbon dioxide geothermal shaft system is used to transport high-temperature carbon dioxide to the temperature-controlled circulation pipeline in the road system. The temperature-controlled circulation pipeline transfers heat to the temperature-controlled road surface, so that the ice and snow on the road surface melt, and the cooled carbon dioxide flows to the air replenishment shaft system in the carbon dioxide geothermal shaft system, thereby ensuring the ground pressure balance in the underground hot zone. The present application uses geothermal energy as energy, providing an innovative new energy road solution that meets the requirements of sustainable development.

[0016] 2. The present application provides a condenser and a compressor, and the condenser reduces the temperature of the cooled carbon dioxide to a temperature at which the compressor can compress it more easily, thereby allowing the cooled carbon dioxide to smoothly enter the gas replenishment shaft system.

[0017] 3. The present application also includes a temperature control system, and the carbon dioxide geothermal shaft system and the road system are electrically connected to the temperature control system, that is, the temperature control system collects information from the upper air and pressure sensors, the supplementary air and pressure sensors, and the road temperature sensors to dynamically adjust the CO 2 Flow rate, compressor power and upper air control valve opening accurately match road heating requirements and reduce energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a carbon dioxide ground-source geothermal road temperature control system provided by an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure of a single temperature-controlled section; Figure 3 It is a schematic diagram of the structure in a top-down state to show the connection of the temperature-controlled circulation pipelines of the upper gas shaft system and the gas supply shaft system; Figure 4 It is a schematic diagram showing the structure of the upper gas shaft system and the gas supply shaft system in a side view.

[0019] Explanation of the reference numerals in the accompanying drawings: 1. Carbon dioxide geothermal shaft system; 11. Upgas shaft system; 111. Upgas cementing pit; 112. Upgas buried pipe; 113. Upgas control valve; 114. Upgas temperature and pressure sensor; 115. Manhole cover; 12. Gas supply shaft system; 121. Gas supply cementing pit; 122. Gas supply buried pipe; 123. Gas supply temperature and pressure sensor; 2. Road system; 21. Temperature-controlled road; 22. Temperature-controlled circulation pipeline; 221. Upgas pipeline; 222. Gas supply pipeline; 23. Road temperature sensor; 3. Temperature control system; 31. Sensor passage; 4. Condenser; 5. Compressor. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-4The present invention is described in further detail.

[0021] Example 1 This embodiment provides a carbon dioxide ground source geothermal road temperature control system, referring to Figure 1 , including a carbon dioxide geothermal shaft system 1, a road system 2 and a temperature control system 3; wherein the carbon dioxide geothermal shaft system 1 includes an upper gas shaft system 11 and an air supply shaft system 12, the upper gas shaft system 11 is used to transport high-temperature carbon dioxide to the road system 2 to transfer heat to the road system 2, and the cooled carbon dioxide in the road system 2 is transported to the air supply shaft system 12; the temperature control system 3 is electrically connected to the carbon dioxide geothermal shaft system 1 and the road system 2, that is, the temperature control system 3 is connected to the carbon dioxide geothermal shaft system 1 and the road system 2 through a sensor passage 31, so as to monitor the temperature and pressure of the carbon dioxide geothermal shaft system 1 and the road system 2 in real time, so as to adjust the flow rate of carbon dioxide in the road system 2; In this embodiment, a plurality of carbon dioxide geothermal shaft systems 1 are provided, each group of carbon dioxide geothermal shaft systems 1 is respectively connected to the temperature control circulation pipeline 22, and the temperature control system 3 is electrically connected to the plurality of carbon dioxide geothermal shaft systems 1, that is, the temperature control system 3 is connected to the plurality of carbon dioxide geothermal shaft systems 1 through the sensor passage 31.

[0022] Reference Figure 2 and Figure 3 The road system 2 includes a temperature-controlled road 21, a temperature-controlled circulation pipeline 22 and a road temperature sensor 23; the temperature-controlled circulation pipeline 22 is connected to the upper air shaft system 11 through an upper air pipeline 221, and the temperature-controlled circulation pipeline 22 is connected to the air supply shaft system 12 through an air supply pipeline 222. The upper air pipeline 221 and the air supply pipeline 222 are both located on the surface of the temperature-controlled road 21, and the temperature-controlled circulation pipeline 22 is buried in a reserved groove of the temperature-controlled road 21, and the temperature-controlled circulation pipeline 22 is in a W-shaped distribution state to increase the heat dissipation area; the road temperature sensor 23 is installed on the temperature-controlled circulation pipeline 22 to monitor the temperature of the temperature-controlled circulation pipeline 22, and the road temperature sensor 23 is electrically connected to the temperature control system 3 through the sensor passage 31 to transmit the temperature signal of the temperature-controlled circulation pipeline 22 to the temperature control system 3. A condenser 4 and a compressor 5 are installed in series on the air supply pipeline 222. Both the condenser 4 and the compressor 5 are electrically connected to the temperature control system 3 through a sensor passage 31, so that the temperature control system 3 can control the start and stop and power regulation of the condenser 4 and the compressor 5. The arrangement direction of the condenser 4 and the compressor 5 is consistent with the flow direction of the carbon dioxide, that is, the condenser 4 reduces the temperature of the cooled carbon dioxide to a temperature that is easier for the compressor 5 to compress, so that the cooled carbon dioxide can smoothly enter the air supply shaft system 12 to ensure the ground pressure balance of the underground hot zone.

[0023] Reference Figure 1 and Figure 4 The upper gas shaft system 11 includes an upper gas cementing pit 111, an upper gas buried pipe 112, an upper gas control valve 113, an upper temperature and pressure sensor 114 and a manhole cover 115; the upper gas cementing pit 111 is dug in a vertical downward direction to the geothermal heat exchange position, that is, the bottom and top of the upper gas cementing pit 111 are open, the upper gas buried pipe 112 is arranged in the upper gas cementing pit 111, and the circumferential side wall of the upper gas buried pipe 112 is in a close contact with the circumferential inner wall of the upper gas cementing pit 111, the upper gas control valve 113 and the upper temperature and pressure sensor 114 are arranged in a position near the top of the upper gas buried pipe 112, and the upper temperature and pressure sensor 114 is located below the upper gas control valve 113, the upper temperature and pressure sensor 114 and the upper gas control valve 113 are both electrically connected to the temperature control system 3 through the sensor passage 31, and the manhole cover 115 is arranged at the top of the upper gas cementing pit 111. The manhole cover 115 is provided with a through hole connected to the upper gas pipeline 221 , that is, the upper gas buried pipe 112 transports high-temperature carbon dioxide to the temperature control circulation pipeline 22 through the upper gas pipeline 221 to transfer heat to the temperature control pipeline 21 .

[0024] Reference Figure 1 and Figure 4 The air supply shaft system 12 includes an air supply cementing pit 121, an air supply buried pipe 122, an air supply temperature and pressure sensor 123 and a manhole cover 115; the bottom of the air supply cementing pit 121 extends to the geothermal heat exchange, that is, the bottom and top of the air supply cementing pit 121 are open, the air supply buried pipe 122 is arranged in the air supply cementing pit 121, and the circumferential side wall of the air supply buried pipe 122 is in a close contact with the circumferential inner wall of the air supply cementing pit 121, the air supply temperature and pressure sensor 123 is arranged in a position near the top of the air supply buried pipe 122, the air supply temperature and pressure sensor 123 is electrically connected to the temperature control system 3 through the sensor passage 31, and the manhole cover 115 is arranged at the top of the air supply cementing pit 121. The manhole cover 115 is provided with a through hole connected to the air supply pipeline 222, that is, the carbon dioxide cooled in the temperature control circulation pipeline 22 is cooled again through the condenser 4, and the cooled carbon dioxide is transmitted to the air supply buried pipe 122 through the compressor 5 and the air supply pipeline 222 to ensure the ground pressure balance of the underground hot zone.

[0025] Example 2 This embodiment provides a design method for a carbon dioxide ground source geothermal road temperature control system. Figure 1-Figure 4 , including the following steps: (1) On both sides of the temperature-controlled road 21, one gas-up shaft system 11 and one gas-supplement shaft system 12 are arranged every 200-500 meters, and the gas-up shaft system 11 and the gas-supplement shaft system 12 are arranged in a cross-arrangement along both sides of the temperature-controlled road 21. In this embodiment, six gas-up shaft systems 11 and six gas-supplement shaft systems 12 are arranged on each side of the temperature-controlled road 21, wherein two adjacent gas-up shaft systems 11 and gas-supplement shaft systems 12 on the same side of the temperature-controlled road 21 constitute a set of carbon dioxide geothermal shaft systems 1. In this embodiment, a total of six sets of carbon dioxide geothermal shaft systems 1 form a carbon dioxide ground-source geothermal road surface temperature-controlled section, and the length of each section is 1200-3000 meters.

[0026] (2) For each carbon dioxide geothermal vertical shaft system 1, firstly, the gas vertical shaft system 11 and the gas supply vertical shaft system 12 in the carbon dioxide geothermal vertical shaft system 1 are constructed at the installation site, and the gas underground pipe 112 and the gas supply underground pipe 122 are respectively arranged in the gas upper cementing pit 111 and the gas supply cementing pit 121, and extended underground to the position that meets the geothermal heat exchange requirements, and cement is poured on the outer side of the gas underground pipe 112 and the gas supply underground pipe respectively, so that the gas underground pipe 112 is closely attached to the inner wall of the gas upper cementing pit 111, and the underground pipe is closely attached to the inner wall of the gas supply cementing pit 121, so as to reduce the thermal resistance while reinforcing the cementing pit, so as to improve the heat transfer efficiency of the heat exchange system; the gas upper air and pressure sensor 114 and the gas supply underground pipe 122 are respectively arranged in the gas upper cementing pit 111 and the gas supply underground pipe 122, and the gas upper air and pressure sensor 114 and the gas supply underground pipe 122 are respectively arranged in the gas upper cementing pit 1 ... The air temperature and pressure sensors 123 are respectively arranged inside the upper gas buried pipe 112 and the air supply buried pipe 122 at a distance of 2-3 meters from the top, and are used to monitor the air pressure and air temperature of high-temperature carbon dioxide and cooling carbon dioxide; for the upper gas shaft system 11, the upper gas pipeline 221 is connected to the inside of the upper gas buried pipe 112, and the upper gas control valve 113 is used to control the on-off state between the upper gas buried pipe 112 and the upper gas pipeline 221; for the air supply shaft system 12, the air supply pipeline 222 is connected to the inside of the air supply buried pipe 122, and the compressor 5 and the condenser 4 are connected to the air supply pipeline 222; after all the above facilities are installed, the manhole cover 115 is covered on the top of the upper gas cementing pit 111 and the air supply cementing pit 121.

[0027] (3) For each carbon dioxide ground-source geothermal road surface temperature control section, six groups of road systems 2 and one group of temperature control systems 3 are installed. First, six sections of "W"-shaped grooves for placing the temperature control circulation pipeline 22 are opened on the temperature control road 21, and each section of the groove corresponds to each group of carbon dioxide geothermal shaft systems 1; the upper air port of the temperature control circulation pipeline 22 is connected to the upper air pipeline 221, and the air supply port of the temperature control circulation pipeline 22 is connected to the air supply pipeline 222, and the laying and installation connection of a group of temperature control circulation pipelines 22 are completed; then the remaining temperature control circulation pipelines 22 are installed in turn and connected to the corresponding carbon dioxide geothermal shaft systems 1; after completing the above connection, the road temperature sensor 23 is installed, and the road temperature sensor 23 passage is connected to each road temperature sensor 23; finally, the asphalt pavement is laid according to relevant standards; the temperature control system 3 is connected with all the upper air control valves 113, the compressor 5, the condenser 4, the upper air temperature and pressure sensor 114, the air supply temperature and pressure sensor 123 and the road temperature sensor 23 through the sensor passage 31.

[0028] (4) When monitoring weather changes, the temperature control system 3 will make forecasts for cooling and rainy and snowy weather, and will autonomously start the entire system in advance; after the system is running, the temperature control system 3 will control the operation of all the upper air control valves 113, compressors 5, and condensers 4 in the current temperature control section; for each group of carbon dioxide geothermal shaft systems 1, after opening the upper air control valve 113, the high-temperature carbon dioxide in the upper air shaft system 11 will be continuously pressed out of the ground under the action of underground pressure until it enters the upper air pipeline 221, and then enters the temperature control circulation pipeline 22 to release heat and cool; in order to cooperate with the re-pressurization of the cooled carbon dioxide into the ground to ensure the ground pressure balance in the geothermal area, it is necessary to reduce the temperature of the cooled carbon dioxide to a temperature that is easier to compress through the condenser 4, and then the condenser 5 is released through the air supply pipeline 222. The cooled carbon dioxide is then pressed into the underground geothermal area through the air supply shaft system 12; during the road surface heating process, the upper air and barometric sensors 114, the road temperature sensor 23 and the air supply barometric sensor 123 transmit real-time signals to the temperature control system 3 through the sensor path 31, and the autonomous temperature control system 3 will autonomously analyze and judge the road surface heating power, control the opening and closing degree of all upper air control valves 113, and realize precise control of the power of the compressor 5 and the condenser 4, increase or decrease the flow of high-temperature carbon dioxide in the temperature control circulation pipeline 22 according to the actual situation, and complete the autonomous temperature control of the road surface in the temperature control section; at the same time, the temperature control system 3 will also control the compressor 5 in real time to choose to inhale atmospheric carbon dioxide as a supplement when the air pressure is too low according to the air pressure data in the pipeline transmitted by the upper air and barometric sensors 114 and the air supply barometric sensor 123.

[0029] The carbon dioxide ground-source geothermal road temperature control system of the present invention can meet the following technical standards: (1) Calculated based on the heating of a single conventional carbon dioxide geothermal shaft system 1, the shaft depth is 3,000 meters, the high-temperature carbon dioxide is 300°C, the cooling carbon dioxide is 100°C, and the gas output volume is 3×104 kg3 / h. For each temperature-controlled road section, 2.0×106W of heating power can be provided, which is sufficient to meet the requirements of snow and ice melting on a road with a length of 1,000 meters and a width of 25 meters.

[0030] (2) Only one layer of temperature-controlled circulation pipeline 22 is laid inside the road surface, and other construction requirements remain unchanged, which has little impact on the road quality and service life.

[0031] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A carbon dioxide ground source geothermal road temperature control system, characterized in that: include, A carbon dioxide geothermal vertical shaft system (1), the carbon dioxide geothermal vertical shaft system (1) comprising an upper gas vertical shaft system (11) and an air supply vertical shaft system (12), the upper gas vertical shaft system (11) being used to transport high-temperature carbon dioxide, and the air supply vertical shaft system (12) being used to transport cooled carbon dioxide; A road system (2), the road system (2) comprising a temperature-controlled road (21), a temperature-controlled circulation pipeline (22) and a road temperature sensor (23), the temperature-controlled circulation pipeline (22) being connected to an upper gas shaft system (11) and an air supply shaft system (12), the road temperature sensor (23) being arranged on the temperature-controlled circulation pipeline (22), and the temperature-controlled circulation pipeline (22) being buried inside the temperature-controlled road (21).

2. A carbon dioxide ground-source geothermal road temperature control system according to claim 1, characterized in that: The temperature control circulation pipeline (22) and the upper gas shaft system (11) are connected to an upper gas pipeline (221), and the temperature control circulation pipeline and the gas supply shaft system (12) are connected to an gas supply pipeline (222); The gas supply pipeline (222) is provided with a condenser (4) and a compressor (5) arranged along the gas flow direction.

3. The carbon dioxide ground-source geothermal road temperature control system according to claim 1, characterized in that: The carbon dioxide geothermal shaft system (1), the road system (2), the condenser (4) and the compressor (5) are electrically connected to a temperature control system (3).

4. The carbon dioxide ground-source geothermal road temperature control system according to claim 2 is characterized in that: The gas vertical shaft system (11) comprises a gas cementing pit (111), a gas buried pipe (112), a gas control valve (113), a gas temperature and pressure sensor (114) and a well cover (115); The bottom of the upper gas cementing pit (111) extends to the geothermal heat exchange location. The upper gas buried pipe (112) is arranged in the upper gas cementing pit (111). The upper gas buried pipe (112) is used to transport high-temperature carbon dioxide. The upper gas buried pipe (112) is connected to the upper gas pipeline (221). The circumferential side wall of the upper gas buried pipe (112) is in a state of being in contact with the circumferential inner wall of the upper gas cementing pit (111). The upper gas control valve (113) and the upper gas temperature and pressure sensor (114) are arranged at a position near the top of the upper gas buried pipe (112). The well cover (115) is arranged at the top of the upper gas cementing pit (111).

5. The carbon dioxide ground-source geothermal road temperature control system according to claim 2, characterized in that: The gas supply shaft system (12) comprises a gas supply cementing pit (121), a gas supply buried pipe (122), a gas supply temperature and pressure sensor (123), and a well cover (115); The bottom of the air supply cementing pit (121) extends to the geothermal heat exchange location. The air supply buried pipe (122) is arranged in the air supply cementing pit (121). The air supply buried pipe (122) is used to transport cooling carbon dioxide. The air supply buried pipe (122) is connected to the air supply pipeline (222). The circumferential side wall of the air supply buried pipe (122) is in a state of being in contact with the circumferential inner wall of the air supply cementing pit (121). The air supply temperature and pressure sensor (123) is arranged at a position close to the top of the air supply buried pipe (122). The well cover (115) is arranged at the top of the air supply cementing pit (121).

6. The carbon dioxide ground-source geothermal road temperature control system according to claim 1, characterized in that: The temperature control circulation pipeline (22) is distributed in a W shape.

7. The carbon dioxide ground-source geothermal road temperature control system according to claim 3 is characterized in that: The carbon dioxide geothermal vertical shaft system (1) is provided in a plurality of groups, and each group of the carbon dioxide geothermal vertical shaft system (1) is respectively connected to a temperature control circulation pipeline (22).

8. The carbon dioxide ground-source geothermal road temperature control system according to claim 7, characterized in that: The temperature control system (3) is electrically connected to a plurality of groups of carbon dioxide geothermal vertical well systems (1).

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