CN102545720B - Generation system using temperature difference between city asphalt pavement and underground water source pipeline - Google Patents

Abstract

The invention discloses a power generation system utilizing the temperature difference between urban asphalt pavement and underground water source pipelines. A water flow pipe network is arranged in the urban asphalt pavement. The water flow pipe network is connected in parallel to the water source pipes laid under the urban asphalt road surface. The end part is wound on the water source pipeline, and the temperature difference power generation module is respectively installed between the water flow pipe network and the urban asphalt pavement and in the area where the temperature difference between the water flow pipe network and the water source pipeline is relatively large. The invention collects the temperature of the road surface through the thermoelectric power generation module, which can balance the road surface temperature and the ambient temperature, and improve the durability and performance of the pavement structure affected by the temperature. At the same time, the thermoelectric power generation has reliable performance, no pollution, no noise, With the advantage of sustainable use, the generated electric energy can also be used as a supplement for municipal engineering such as road lighting and traffic lights.

Description

Power generation system using temperature difference between urban asphalt pavement and underground water source pipeline

technical field

The invention relates to a pavement power generation technology, in particular to a power generation system utilizing the temperature difference between urban asphalt pavement and underground water source pipelines.

Background technique

Thermoelectric power generation technology is a new power generation technology that uses the Seebeck effect to directly convert heat energy into electrical energy. In recent years, with the continuous research and development of high-performance thermoelectric materials, thermoelectric power generation technology has been continuously applied and promoted in various fields, such as radioisotope thermoelectric generators on spacecraft, automobile exhaust waste heat recovery systems, and utilization of ocean thermoelectric energy. At present, this technology is only applied in specific high-end technical fields, and there is no application precedent in the field of road heat utilization.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a system for generating electricity by using the temperature difference between the urban asphalt pavement and the underground water source pipeline. The temperature difference is converted into electric energy for utilization, and at the same time, the influence of temperature effect on the road surface is weakened, and the performance and durability of the road surface are improved.

To achieve the above object, the present invention adopts the following technical solutions:

A power generation system that utilizes the temperature difference between the urban asphalt pavement and the underground water source pipeline. A water flow pipe network is arranged in the urban asphalt pavement. On the water source pipeline, a number of temperature difference power generation modules are arranged between the water flow pipe network and the urban asphalt pavement and on the contact surface between the water flow pipe network and the water source pipeline.

The thermoelectric power generation modules are respectively arranged on the water flow pipe network in the area where the temperature difference between the circulating water and the asphalt pavement in the water flow pipe network is relatively large, and the return water end of the water flow pipe network is wound on the water source pipe area, and the thermoelectric power generation module is connected to the water flow on one side. The return water end of the pipe network is in contact with the pipe wall, and the other side is in contact with the water source pipe wall.

The present invention arranges a water flow pipe network in the urban asphalt pavement, and the low-temperature water in the water flow pipe network comes from urban tap water pipes, underground water or other water sources (this article takes tap water as an example), and utilizes the temperature difference formed by the high temperature of the asphalt pavement and the low water temperature of the water pipes generate electricity.

As a building structure directly exposed to the natural environment, asphalt pavement is directly affected by natural factors such as solar radiation, temperature, and wind. It will accept and accumulate a large amount of road heat energy, and it will reach extreme road temperature values in summer and winter. This will directly affect the performance and durability of the road surface (high temperature of the road surface will cause rutting on the road surface, and low temperature of the road surface will cause low temperature cracking). This technology utilizes the thermal energy of the road surface, at the same time weakens the influence of the temperature effect on the road surface, and improves the performance and durability of the road surface.

The water flow pipe network is set in the asphalt pavement structure, connected with the tap water pipes under the urban road, and the flowing water is used to enter the pavement pipe network, and the water is used as the medium of heat transfer to balance the temperature of the asphalt pavement and the ambient temperature, and at the same time, a large The specific contact surface of temperature difference is used for temperature difference power generation, and the flowing water participates in the transfer of heat energy and temperature difference power generation, and then flows back to the original urban tap water system to form a cycle.

The core technical points of the asphalt pavement thermoelectric power generation technology are: the design and selection of the hot end and cold end of the thermoelectric power generation system. This technology uses the asphalt pavement or the heated tap water flowing through the asphalt pavement as the hot end, and the tap water buried deep underground at normal temperature or low temperature as the cold end.

The asphalt pavement temperature difference power generation system includes three main parts: the water flow pipe network arranged in the asphalt pavement structure, the effective connection between the water flow pipe network and the tap water pipes laid under the urban road, and the power generation system formed by laying out the temperature difference power generation module at a specific location.

1) Layout of water pipe network

Considering the distribution of heat energy in the structure of the asphalt and the influence of the water flow pipe network on the performance of the asphalt pavement structure, the water flow pipe network can be laid at a depth of 10cm below the road surface (the implementation needs to be carried out according to the specific pavement structure type and theoretical verification. ).

The length and layout of the water flow pipe network should be consistent with the temperature of the asphalt pavement structure when the water flows out. It is necessary to consider the flow rate of water, the functional division of urban road pavement and the influence on the performance of pavement structure.

The location of the water flow pipe network is preferably on the sidewalk and the lane area with a small traffic volume, and the selection criteria for the area is to bear the small traffic load.

The water flow pipe network is an important and most vulnerable link in the entire asphalt pavement thermoelectric power generation system, so the selection of water flow pipe network materials and its protection during construction and operation are very important. The water flow pipe network should adopt materials with high thermal conductivity, high strength and durability.

In addition, during the construction of asphalt pavement structure, asphalt mixture mixed with additives such as graphite can be used to improve the thermal conductivity of the structure, thereby improving the efficiency of thermoelectric power generation.

2) Connection of water flow pipe network with tap water and heating pipes

The setting of the connection part should consider the characteristics of the layout of the urban tap water pipeline: the pipeline is arranged parallel to the center line of the road; the pipeline is usually arranged under the sidewalk or the lane with less traffic; the buried depth of the pipeline is usually about 2m. The setting principle is to reduce the impact on the tap water system.

A technical point to pay special attention to when setting up the connection part is that the circulating water does not directly flow back to the tap water pipe, but has a process of parallel temperature adjustment. The water has a certain temperature difference, and a thermoelectric power generation module can be arranged to generate electricity.

The valves at the connection part that control the circulating water entering the asphalt pavement pipe network must be set above the road surface or at a position that is easy to operate and pay attention to protection. The difference in diameter and water pressure between the main pipeline and the circulation pipeline must be well coordinated. Leakage measures.

3) Arrangement of thermoelectric power generation module

Regardless of summer or winter, there is a large temperature difference between the asphalt pavement structure and tap water. This temperature difference should not be realized through shallow buried tap water pipelines. This technology introduces the circulating water in the pipeline into the water flow pipe network in the asphalt pavement structure. method to solve it. When the circulating water first enters the asphalt pavement structure, there will be a large temperature difference between the two, and then it will be heated or cooled by the asphalt pavement. Before the circulating water flows back to the tap water pipe, there will be a large temperature difference with the water in the pipe. Therefore, the thermoelectric power generation module has two layout areas: one is the front section of the water flow pipe network, the area where the temperature difference between the circulating water and the asphalt pavement is large, and the thermoelectric power generation module can be directly attached to the water flow pipe; In parallel, where there is a large temperature difference between the two, the thermoelectric power generation module needs to contact the wall of the circulating water pipe of the water flow pipe network while contacting the wall of the tap water pipe.

The number and density of thermoelectric power generation modules can be determined according to the voltage of road appliances, actual road conditions and economy. The thermoelectric power generation module is an existing technology and can be bought in the market, so it will not be repeated here.

The selection of thermoelectric power generation materials is the most important part of the entire power generation module, and new materials with good economy and high thermoelectric conversion efficiency should be selected. At present, the low-temperature power generation materials with higher quality factors on the market are Bi2Te3-Bi2Se3 solid solution (N type) and Bi2Te3-Sb2Te3 solid solution (P type), such as TEG1-127-2.8-3.5-200 produced by Guangdong Fuxin Electronic Technology Co., Ltd. Type thermoelectric power generation components, etc. However, with the advancement of science and technology, new and more efficient thermoelectric power generation materials will continue to appear, and new materials and technologies must be updated in time.

The thermoelectric power generation module needs to be equipped with a power storage device to adjust the use of the thermoelectric power generation. If necessary, a DC to AC conversion device is also required. The power generated by the thermoelectric power generation is direct current.

The beneficial effect of the present invention is that the asphalt pavement temperature difference power generation technology collects the road surface temperature through the thermoelectric power generation module, which can play a role in balancing the road surface temperature and the ambient temperature, and improve the durability and serviceability of the pavement structure affected by temperature. Temperature difference power generation has the advantages of reliable performance, no pollution, no noise, and sustainable use. The generated electric energy can also be used as a supplement for municipal engineering such as road lighting and traffic lights.

Description of drawings

Fig. 1 structural representation of the present invention;

Fig. 2 is a schematic diagram of the structure of a thermoelectric power generation module;

Figure 3 is a schematic diagram of the planar layout of the water flow pipe network;

Fig. 4 is a schematic diagram of the connection between the water flow pipe network and the main pipeline;

Figure 5 is a schematic diagram of the layout of the thermoelectric power generation module;

Among them, 1. Conductor, 2. Thermal insulation protection shell, 3. Heat insulation protection shell, 4. Contact hot end, 5. Contact cold end, 8. Tap water pipe, 10. Valve, 11. Return water end, 12. Temperature difference Power generation module, 13 urban asphalt pavement, 14. water pipe network.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1-5, an urban asphalt pavement temperature difference power generation system, a water flow pipe network 14 is arranged in the urban asphalt pavement 13, and the water flow pipe network 14 is connected in parallel to the water source pipeline laid under the urban asphalt pavement 13, and the water flow pipe network A part of the return water end 11 of 14 is wound on the water source pipeline, and a plurality of thermoelectric power generation modules 12 are arranged between the water flow pipe network 14 and the urban asphalt pavement 13 and in the area where the temperature difference between the water flow pipe network 14 and the water source pipeline is the largest. The thermoelectric power generation module 12 is connected with electrical equipment through a circuit.

The thermoelectric power generation modules 12 are respectively arranged on the water flow pipe network 14 in the area where the temperature difference between the circulating water and the urban asphalt pavement 13 in the water flow pipe network 14 is the largest, and the return water end 11 of the water flow pipe network 14 is partially wound on the water source pipe area, and the temperature difference One side of the power generation module 12 is in contact with the pipe wall of the return water end 11 of the water flow pipe network 14 , and the other side is in contact with the pipe wall of the water source pipe.

The water source in the present invention is tap water or heating or underground water. Here we take tap water as an example. Other water sources are similar to this and will not be repeated here.

Urban asphalt pavement 13, as a building structure directly exposed to the natural environment, is directly affected by natural factors such as solar radiation, temperature, and wind. It will receive and accumulate a large amount of road surface heat energy, and it will reach extreme road surface temperature values in summer and winter. This will directly affect the performance and durability of the road surface (high temperature of the road surface will cause rutting on the road surface, and low temperature of the road surface will cause low temperature cracking). This technology utilizes the thermal energy of the road surface, at the same time weakens the influence of the temperature effect on the road surface, and improves the performance and durability of the road surface.

A water flow pipe network 14 is set in the urban asphalt pavement 13, which is connected with the tap water pipe 8 under the urban road, and the flowing water in it is used to enter the road pipe network, and the temperature of the asphalt pavement and the environment are balanced by using water as the medium for transferring heat energy, and simultaneously forming The specific contact surface with a large temperature difference is used for temperature difference power generation, and the flowing water participates in the transfer of heat energy and temperature difference power generation, and then flows back to the original urban tap water system to form a cycle.

The core technical points of the asphalt pavement thermoelectric power generation technology are: the design and selection of the hot end and cold end of the thermoelectric power generation system. This technology uses the asphalt pavement or the heated tap water flowing through the asphalt pavement as the hot end, and the tap water buried deep underground at normal temperature or low temperature as the cold end.

The asphalt pavement temperature difference power generation system includes three main parts: the water flow pipe network 14 arranged in the asphalt pavement structure, the effective connection between the water flow pipe network 14 and the tap water pipe 8 laid under the urban road, and the thermoelectric power generation module 12 arranged at a specific position to form power generation system.

1) layout of water flow pipe network 14

As shown in Figure 3, considering the distribution of heat energy in the structure inside the asphalt and the impact of the water flow pipe network 14 on the performance of the asphalt pavement structure, the water flow pipe network 14 can be arranged at a depth of 10 cm below the road surface (it must be implemented according to the specific conditions) pavement structure types for experiments and theoretical verification).

The length and arrangement form of the water flow pipe network 14 are preferably consistent with the temperature of the asphalt pavement structure when the water flows out. It is necessary to consider the flow rate of water, the functional division of urban road pavement and the influence on the performance of pavement structure.

The location of the water flow pipe network 14 is suitable for sidewalks and lane areas with small traffic volume, and the selection criteria for the area is to bear a small traffic load.

The water flow pipe network 14 is an important and most vulnerable link in the entire asphalt pavement temperature difference power generation system, so the selection of water flow pipe network materials and its protection during construction and operation are very important. The water flow pipe network should adopt materials with high thermal conductivity, high strength and durability.

In addition, during the construction of asphalt pavement structure, asphalt mixture mixed with additives such as graphite can be used to improve the thermal conductivity of the structure, thereby improving the efficiency of thermoelectric power generation.

2) the connection of the water flow pipe network 14 and the tap water pipeline

As shown in Figure 4, the setting of the connection part should consider the characteristics of the layout of the urban tap water pipeline 8: the pipeline is arranged parallel to the center line of the road; the pipeline is usually arranged under the sidewalk or the lane with less traffic; the buried depth of the pipeline is usually about 2m. The setting principle is to reduce the impact on the tap water system.

A technical point to pay special attention to when setting up the connection part is that the circulating water does not directly flow back to the tap water pipe 8, but has a process of parallel temperature adjustment. The water in the water has a certain temperature difference, and the thermoelectric power generation module 12 can be arranged to generate electricity.

The valve 10 that controls the circulating water entering the asphalt pavement pipe network at the connecting part must be set above the road surface or at a position that is easy to operate and pay attention to protection. The difference in diameter and water pressure between the main pipeline and the circulating pipeline must be well coordinated. Measures for water leakage.

3) Arrangement of thermoelectric power generation module

Regardless of summer or winter, there is a large temperature difference between the asphalt pavement structure and tap water. This temperature difference should not be realized by shallowly buried tap water pipes. method to solve it. When the circulating water just enters the asphalt pavement structure, there will be a large temperature difference between the two, and then it will be heated or cooled by the asphalt pavement. Before the circulating water flows back to the tap water pipeline 8, there will be a large temperature difference with the water in the pipeline. Therefore, the thermoelectric power generation module has two layout areas: one is the front section of the water flow pipe network 14, where the temperature difference between the circulating water and the asphalt pavement is relatively large, and the thermoelectric power generation module 12 can be directly attached to the water flow pipe; The tap water pipes are parallel, and there is a region with a large temperature difference between the two. The temperature difference power generation module 12 needs to contact the water flow pipe network 14 circulating water pipe wall while contacting the tap water pipe 8 pipe wall.

As shown in FIG. 5 , the number and density of the thermoelectric power generation modules 12 can be determined according to the voltage of road appliances, actual road conditions and economical efficiency. As shown in Figure 2, the thermoelectric power generation module 12 is an existing technology and can be purchased on the market. It includes a conductor 1, a heat-conducting insulating protective shell 2, a heat-insulating protective shell 3, a contact hot end 4, and a contact cold end 5 , and its detailed structure will not be repeated here.

The selection of thermoelectric power generation materials is the most important part of the entire power generation module, and new materials with good economy and high thermoelectric conversion efficiency should be selected. At present, the low-temperature power generation materials with higher quality factors on the market are Bi ₂ Te ₃ -Bi ₂ Se ₃ solid solution (N type) and Bi ₂ Te ₃ -Sb ₂ Te ₃ solid solution (P type), such as Guangdong Fuxin Electronic Technology Co., Ltd. The company produces TEG1-127-2.8-3.5-200 thermoelectric power generation components, etc. However, with the advancement of science and technology, new and more efficient thermoelectric power generation materials will continue to appear, and new materials and technologies must be updated in time.

The thermoelectric power generation module 12 needs to be equipped with a power storage device to adjust the use of the thermoelectric power generation. If necessary, a DC/AC conversion device is also required. The power generated by the thermoelectric power generation is direct current.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (2)

1. A power generation system using the temperature difference between the urban asphalt pavement and the underground water source pipeline, which is characterized in that the temperature difference formed by the high temperature of the asphalt pavement and the low water temperature of the water source pipeline is used to generate electricity, and a water flow pipe network is arranged in the urban asphalt pavement, and the water flow pipe network is connected in parallel to the city On the water source pipeline laid under the asphalt pavement, and part of the return water end of the water flow pipe network is wound on the water source pipe. Several thermoelectric power generation modules; The thermoelectric power generation modules are respectively arranged on the water flow pipe network in the area where the temperature difference between the circulating water and the asphalt pavement in the water flow pipe network is relatively large, and the return water end of the water flow pipe network is wound on the water source pipe area, and the thermoelectric power generation module is connected to the water flow on one side. The return water end of the pipe network is in contact with the pipe wall, and the other side is in contact with the water source pipe wall; The hot water in the asphalt pavement or the water pipe network heated by the asphalt pavement is the hot end, and the water in the water source pipes buried deep underground at room temperature or low temperature is the cold end; The water source pipeline is arranged parallel to the centerline of the road; the buried depth of the pipeline is 2m; The flowing water in the water source pipeline is used to enter the road pipe network. The circulating water does not flow directly back to the water pipe, but has a parallel temperature adjustment process. Water is used as the medium to transfer heat energy to balance the temperature of the asphalt pavement and the ambient temperature, and at the same time form a temperature difference. The contact surface is used for temperature difference power generation, and the flowing water participates in the transfer of heat energy and temperature difference power generation, and then flows back to the original urban water source pipeline system to form a cycle. 2. The temperature difference power generation system utilizing urban asphalt pavement and underground water source pipelines as claimed in claim 1, wherein said water source is tap water or ground water.