Method for relieving hot stacking of subway energy pile group

Abstract

The invention discloses a method for relieving hot stacking of a metro energy pile group, temperature sensors are distributed at intervals in the depth direction of each energy pile and used for monitoring the vertical temperature gradient of the energy piles, and a soil body temperature sensing array is arranged in a soil body of an energy pile group area and used for monitoring the temperature of the soil body. A three-dimensional detection network of a soil body temperature field around an energy pile group is established, an independent adjusting valve is arranged on a water inlet branch pipe of each energy pile and used for independently adjusting the flow of the corresponding energy pile, the energy pile group is divided into a plurality of control areas, and an area adjusting valve is arranged on a water inlet or water return main pipe of the energy pile in each control area and used for independently adjusting the flow of the corresponding energy pile. The controller is used for synchronously adjusting the flow of all the energy piles in the corresponding control areas, adjusting the working states of the area adjusting valves based on the soil body temperature, adjusting the heat exchange difference of all the control areas of the energy pile group, adjusting the working states of the independent adjusting valves based on the vertical temperature gradient of the energy piles, and adjusting the heat exchange difference of the single energy piles. The heat accumulation effect is relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geothermal energy, in particular to a method for relieving heat accumulation of metro energy pile groups. BACKGROUND

[0002] The support pile foundation around the metro tunnel provides a large amount of buried pipe space for geothermal energy development. The energy pile group is to bury heat exchange pipes in the pile foundation, so that the heat exchange pipes exchange heat with the surrounding rock-soil mass to realize the functions of heating and refrigeration. However, when these dense energy pile groups operate cooperatively, a strong concentrated heat disturbance source is formed, which causes the formation temperature in the energy pile group area to deviate from the initial equilibrium state (such as continuous temperature rise in summer and continuous temperature drop in winter), which is the "heat accumulation" effect. This will cause the evaporation temperature of the heat pump unit of the energy pile group to drop or the condensation temperature to rise, so that the energy efficiency ratio of the energy pile group is sharply attenuated, and even the physical and mechanical properties of the surrounding soil are affected.

[0003] In the prior art, a single energy pile is usually optimized, or the group control start-stop of the energy pile group is directly performed, which causes the formation temperature in the energy pile group area to be uneven and the heat accumulation effect to be unable to be effectively relieved.

[0004] Therefore, how to stably and reliably relieve the heat accumulation effect of the energy pile group has become a problem to be solved in the field. SUMMARY

[0005] In view of the defects of the prior art, the purpose of the present application is to provide a method for stably and reliably relieving the heat accumulation of metro energy pile groups.

[0006] In order to achieve the above purpose, the method for relieving the heat accumulation of metro energy pile groups provided by the present application is characterized in that temperature sensors are arranged at intervals along the depth direction of each energy pile for monitoring the vertical temperature gradient of the energy pile, a soil temperature sensor array is arranged in the soil of the energy pile group area for monitoring the soil temperature, and a three-dimensional detection network of the soil temperature field around the energy pile group is established, An independent adjusting valve is arranged on the water inlet branch pipe of each energy pile for independently adjusting the flow of the corresponding energy pile, the energy pile group is divided into a plurality of control areas, and a regional adjusting valve is arranged on the water inlet or return pipe of the energy pile in each area for synchronously adjusting the flow of all energy piles in the corresponding control area, The controller adjusts the working state of the regional adjusting valve based on the soil temperature to adjust the heat exchange difference of each control area of the energy pile group, and adjusts the working state of the independent adjusting valve based on the vertical temperature gradient of the energy pile to adjust the heat exchange difference of the single energy pile.

[0007] Further, the temperature sensors are arranged in the upper, middle and lower regions of the heat exchange pipes in the energy pile, respectively.

[0008] Further, the temperature sensor is composed of a platinum resistance temperature sensor.

[0009] Further, the soil temperature sensor array comprises a distributed optical fiber temperature sensing system or several digital temperature sensors.

[0010] Further, the monitoring points of the soil temperature sensor array are located at the center positions between adjacent energy piles and away from the boundaries of the energy pile group.

[0011] Further, the energy piles in the control area are distributed adjacently.

[0012] The method for relieving heat accumulation of the metro energy pile group provided by the present application independently monitors the vertical temperature gradient of each energy pile and detects the soil temperature, and the temperature sensor of the energy pile and the soil temperature sensor array cooperatively form a three-dimensional detection network of the soil temperature field, so that the soil temperature field is monitored in three dimensions and in real time, and the controller can independently regulate and control the energy pile group and regionally regulate and control the energy pile group, so that the heat exchange difference of the energy pile group is accurately controlled, thereby effectively relieving the heat accumulation effect. BRIEF DESCRIPTION OF DRAWINGS

[0013] The present application will be further described below in combination with the drawings and specific embodiments.

[0014] Figure 1 The system block diagram of the method for relieving heat accumulation of the metro energy pile group provided by the present application is shown in the figure. Figure 2 The schematic diagram of the energy pile and the temperature sensor in the present application is shown in the figure. Figure 3 The schematic diagram of the control area of the energy pile group in the present application is shown in the figure. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, purposes and effects achieved by the present application easy to understand, the present application will be further described below in combination with specific figures.

[0016] Reference is made to Figure 1 which shows one example of the method for relieving heat accumulation of the metro energy pile group provided by the present application.

[0017] The method for relieving heat accumulation of the metro energy pile group in the present example is used for monitoring the vertical temperature gradient of the energy pile 11 by spacing the temperature sensor 2 in the depth direction of each energy pile 11, monitoring the soil temperature by arranging the soil temperature sensor array 3 in the soil of the energy pile group 1 region, and establishing a three-dimensional detection network of the soil temperature field around the energy pile group to monitor the soil temperature field in three dimensions and in real time.

[0018] An independent adjusting valve 4 is arranged on the water inlet branch pipe 12 of each energy pile 11 to independently adjust the flow of the corresponding energy pile 11, and the energy pile group 1 is divided into several control areas, and a regional adjusting valve 5 is arranged on the water inlet or return pipe 13 of the energy pile 11 in each control area to synchronously adjust the flow of all energy piles 11 in the corresponding control area; The controller 6 adjusts the working state of the regional adjusting valve 5 based on the soil temperature to adjust the heat exchange difference of each control area of the energy pile group 1, and adjusts the working state of the independent adjusting valve 4 based on the vertical temperature gradient of the energy pile 11 to adjust the heat exchange difference of the single energy pile 11, so as to realize the accurate control of the heat exchange difference of the energy pile group and effectively alleviate the heat accumulation effect.

[0019] In combination Figure 2 The temperature sensor 2 is arranged in the upper, middle and lower regions of the heat exchange pipe in the energy pile 11, so that each temperature sensor 2 can monitor the temperature data at different depths of the energy pile 11 to form the vertical temperature gradient of the energy pile 11.

[0020] Preferably, the temperature sensor 2 is composed of a platinum resistance temperature sensor to improve the monitoring accuracy and stability of the vertical temperature gradient.

[0021] Further, the soil temperature sensing array 3 includes a distributed optical fiber temperature sensing system or a plurality of digital temperature sensors, which are arranged in a grid array in the soil of the region of the energy pile group 1, and each monitoring point of the soil temperature sensing array 3 is located at the center position between adjacent energy piles 11 and away from the boundary of the energy pile group 1, for example, 5 meters or 10 meters away from the boundary of the energy pile group 1, so that the soil temperature sensing array 3 can monitor the temperature distribution of the soil.

[0022] Therefore, the soil temperature sensing array 3 cooperates with the temperature sensor 2 on each energy pile 11 to form a three-dimensional detection network of the soil temperature field around the energy pile group 1, which can realize three-dimensional and real-time monitoring of the soil and reflect the temperature distribution difference of each region of the soil.

[0023] In combination Figure 2 Further, the independent adjusting valve 4 is arranged on the water inlet branch pipe 12 of each energy pile 11, so that the independent adjusting valve 4 can independently adjust the flow of the corresponding energy pile 11 to adjust the heat exchange temperature of the energy pile 11.

[0024] In combination Figure 3Meanwhile, the energy pile group 1 is divided into several control areas, each of which contains a plurality of energy piles 11 (for example, 5-10) that are physically adjacent and have strong heat interaction, and a regional regulating valve 5 is arranged on the water inlet or return pipe 13 of the energy piles 11 in each control area, so that the regional regulating valve 5 can synchronously regulate the flow of all energy piles 11 in the corresponding control area, thereby realizing overall regulation of the heat exchange temperature of the entire control area.

[0025] Thus, by adjusting the working state of the regional regulating valve 5 in each control area, the heat exchange difference of the energy pile group 1 in different control areas can be adjusted, and by adjusting the independent regulating valve 4 of a single energy pile 11 in the control area, the fine adjustment of the heat exchange difference of the single energy pile 11 can be realized to achieve the precise condition of the heat exchange difference, thereby effectively relieving the heat accumulation effect.

[0026] In cooperation therewith, the controller 6 judges the temperature distribution difference of each region of the soil based on the soil temperature monitored by the soil temperature sensing array 3, and adjusts the working state of the regional regulating valve 5 to adjust the heat exchange difference of each control area of the energy pile group 1, and balances the heat exchange load between different control areas.

[0027] Meanwhile, the controller 6 can also adjust the corresponding independent regulating valve 5 based on the vertical temperature gradient of each energy pile 11 to adjust the heat exchange difference of the single energy pile 11, and prevent the single energy pile 11 in the control area from being overheated or overcooled.

[0028] As an example, the soil temperature sensing array 3 monitors that the average temperature of region A in the soil temperature distribution is too high, while the temperature of region B is normal, and the controller 6 closes the opening of the regional regulating valve 5 corresponding to region A in the corresponding control area, while increasing the opening of the regional regulating valve 5 corresponding to region B in the corresponding control area, thereby transferring the heat load from region A to region B and guiding the heat distribution area to be balanced, thereby relieving the heat accumulation.

[0029] The method for relieving the heat accumulation of the subway energy pile group provided by the present application independently monitors the vertical temperature gradient of each energy pile and detects the soil temperature, and the temperature sensor of the energy pile and the soil temperature sensing array cooperate to form a three-dimensional detection network of the soil temperature field, thereby performing three-dimensional and real-time monitoring of the soil temperature field, and the controller can independently regulate and regionally regulate the energy pile group to realize accurate control of the heat exchange difference of the energy pile group, thereby effectively relieving the heat accumulation effect.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for mitigating heat accumulation of metro energy pile groups, characterized in that, temperature sensors are arranged at intervals along the depth direction of each energy pile to monitor the vertical temperature gradient of the energy pile, and a soil temperature sensor array is arranged in the soil in the energy pile group area to monitor the soil temperature, so as to establish a three-dimensional detection network of the soil temperature field around the energy pile group, an independent adjusting valve is arranged on the water inlet branch pipe of each energy pile to independently adjust the flow of the corresponding energy pile, the energy pile group is divided into several control areas, and a regional adjusting valve is arranged on the water inlet or return main pipe of each energy pile in each control area to synchronously adjust the flow of all energy piles in the corresponding control area, a controller adjusts the working state of the regional adjusting valve based on the soil temperature to adjust the heat exchange difference of each control area of the energy pile group, and adjusts the working state of the independent adjusting valve based on the vertical temperature gradient of the energy pile to adjust the heat exchange difference of the single energy pile.

2. The method of mitigating heat buildup metro energy pile groups of claim 1, wherein, The temperature sensors are respectively arranged in the upper, middle and lower regions of the heat exchange pipe in the energy pile.

3. The method of mitigating heat buildup metro energy pile groups of claim 1, wherein, The temperature sensors are composed of platinum resistance temperature sensors.

4. The method of mitigating heat buildup metro energy pile groups of claim 1, wherein, The soil temperature sensor array comprises a distributed optical fiber temperature sensing system or several digital temperature sensors.

5. The method of mitigating heat buildup metro energy pile groups of claim 1, wherein, The monitoring points of the soil temperature sensor array are located at the center positions between adjacent energy piles and away from the boundary of the energy pile group.

6. The method of mitigating heat buildup metro energy pile groups of claim 1, wherein, The energy piles in the control area are arranged adjacently.

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