CN213815232U - Middle-deep buried pipe sand box experiment system for simulating real geological conditions - Google Patents
Middle-deep buried pipe sand box experiment system for simulating real geological conditions Download PDFInfo
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- CN213815232U CN213815232U CN202023158597.2U CN202023158597U CN213815232U CN 213815232 U CN213815232 U CN 213815232U CN 202023158597 U CN202023158597 U CN 202023158597U CN 213815232 U CN213815232 U CN 213815232U
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Abstract
The utility model belongs to the technical field of buried pipe ground source heat pump system is relevant to a simulation real geological conditions's deep buried pipe sand box experimental system in middle and deep is disclosed. The experimental system comprises a sand box, a geological stratification building component, a geothermal gradient building component, a groundwater seepage building component and a buried pipe unit; the geological stratification building component is used for simulating soil environments at different depths; the geothermal gradient building component is used for simulating different temperatures of geological layers at different depths; the groundwater seepage building component permeates water into the sand box to simulate the water seepage condition of the geological formation; the buried pipe of the buried pipe unit is a coaxial sleeve buried pipe, and the temperature difference between the inlet and the outlet of the coaxial sleeve buried pipe is measured to obtain the heat exchange condition of the buried pipe in the sand box. Through the utility model discloses, the combined action of three kinds of factors of simulation geothermal gradient, groundwater seepage flow and geological stratification builds single geological condition or multiple geological condition, provides simple convenient experimental system.
Description
Technical Field
The utility model belongs to the technical field of buried pipe ground source heat pump system is relevant, more specifically relates to a simulation real geological conditions's deep buried pipe sand box experimental system in well.
Background
The ground heat exchanger is the most important for the ground source heat pump system of the ground pipe. The well-developed technology of the shallow-layer buried pipe heat exchanger is usually about 100 meters in drilling depth, but is often limited by insufficient buried pipe land in practical application, the heat exchanger of the middle-deep layer buried pipe is a new variety of the heat exchanger of the buried pipe derived from the technology, and the drilling depth can reach more than 2000 meters. In the engineering practice of exploring a heat exchanger of a medium-deep buried pipe, a sleeve pipe becomes a mainstream buried pipe form due to the consideration of pipeline strength and construction process, rather than adopting a common U-shaped pipe of a shallow buried pipe. When the heat transfer analysis of the deep-hole buried pipe heat exchanger is considered, the heat transfer model and the design calculation method of the original shallow buried pipe need to be correspondingly improved. Firstly, the temperature at the bottom of the deep hole can reach 50-80 ℃, so the influence of the ground temperature gradient on the heat transfer of the buried pipe needs to be considered; secondly, geological layers at different depths have different components, densities, water contents and specific heat capacities, so that the influence of geological stratification on the heat transfer of the buried pipe is considered; thirdly, the middle-deep ground source heat pump almost inevitably meets the condition of underground water seepage due to the deep drilling depth, so the influence of the seepage on the heat transfer of the buried pipe is considered.
The heat exchanger of the middle-deep buried pipe is a technical innovation of a ground source heat pump system of the buried pipe, has the unique advantages of small occupied area and high available ground temperature, and is particularly suitable for being applied in cold regions; among the prior art few middle-deep ground source heat pump field simulation true geology situation has considered three kinds of condition combined action of geothermal gradient, groundwater seepage flow, geological stratification among them, generally is one or two kinds of condition effects, is not convenient for carry out the accurate control to the variable simultaneously, consequently awaits urgent need to develop a novel middle-deep ground pipe sand box experimental system.
SUMMERY OF THE UTILITY MODEL
To the above defect of prior art or improve the demand, the utility model provides a middle and deep buried pipe sand box experimental system of the true geological conditions of simulation builds the subassembly through setting up geothermal gradient, groundwater seepage flow builds subassembly and geological stratification and builds the subassembly, simulates the combined action of three kinds of factors of geothermal gradient, groundwater seepage flow and geological stratification respectively, and accurate realization is to the simulation of earth's surface geological environment, and the reality of laminating more provides a simple convenient system of simulation of middle and deep buried pipe geological environment.
For realizing above-mentioned purpose, according to the utility model discloses, a simulation real geology condition's deep buried pipe sand box experimental system in middle and deep layer is provided, its characterized in that, this experimental system includes that sand box, geology layering build subassembly, geothermol power gradient build subassembly, groundwater seepage build subassembly and buried pipe unit, wherein:
the geological stratification building assembly comprises a plurality of partition plates and is used for partitioning sandy soil in the sand box into a plurality of areas, and different filling materials are arranged in each area so as to simulate different soil environments of geological layers with different depths;
the geothermal gradient building assembly is arranged on one side of the sand box and is used for conducting heat to the sand box from the side surface and then conducting heat from area to area in the sand box, so that the temperature in each area in the sand box is different, and different temperatures of geological layers in different depths are simulated;
the underground water seepage building assembly comprises a top water tank arranged above the sand box and a bottom water tank arranged below the sand box, holes which are uniformly distributed are formed in the bottom of the top water tank and the top of the bottom water tank, the top water tank permeates water into a filling material in the sand box through the holes so as to simulate the condition that water seeps from a geological stratum, and the bottom water tank collects water seeped from the filling material through the holes in the top of the bottom water tank;
the buried pipe unit comprises a buried pipe and a first water circulation unit connected with the buried pipe, the buried pipe is buried in the center of sand of the sand box and is a coaxial sleeve buried pipe, one end of the first water circulation unit conveys water into an inner pipe of the coaxial sleeve buried pipe, and the water flows out from an outer pipe of the coaxial sleeve buried pipe after heat exchange is carried out between the coaxial sleeve buried pipe and a filling material outside the buried pipe; and measuring the temperature of water at the inlet and the outlet of the coaxial sleeve buried pipe to obtain a temperature difference, so as to obtain the heat exchange condition of the buried pipe in the sand box.
Further preferably, the experimental system further comprises a data acquisition and control component, which is connected with the geological stratification construction component, the geothermal gradient construction component, the groundwater seepage construction component and the buried pipe unit at the same time, and is used for acquiring and adjusting the water temperature, the soil temperature, the environment temperature, the water flow and the water pressure fed back by each component.
Further preferably, gauze is arranged between the top water tank and the sand box and between the bottom water tank and the sand box, and the size of the gauze is smaller than the particle size of the filling material, so that the filling material in the sand box is prevented from entering the top water tank and the bottom water tank.
Further preferably, the sand box is provided with a plurality of slots on the top and the bottom for placing the partition plates, and the insertion positions and the number of the partition plates are changed by placing the partition plates in different slots, so that geological layers with different relative thicknesses are simulated.
Further preferably, a plurality of sensors are uniformly arranged on the diagonal line of the side plate of the sand box at one side where the geothermal gradient building component is arranged, and are used for measuring the temperature at different positions on the side plate in real time so as to monitor the heating temperature and whether the heating of the geothermal gradient building component is uniform or not; and a plurality of sensors are uniformly distributed on the diagonal of the side plate of the sand box, which is far away from one side of the geothermal gradient building component, and are used for measuring the ambient temperature, the humidity and the atmospheric pressure.
Further preferably, a plurality of sensors are uniformly distributed on the transverse and longitudinal central axes of the partition board, and are used for measuring real-time temperatures at different positions in real time.
Further preferably, the periphery of the sand box is provided with an insulating layer for maintaining the temperature of the sand box.
Further preferably, the geothermal gradient building assembly comprises a serpentine water pipe and a second water circulation unit, the serpentine water pipe is attached to one side of the sand box, and the second water circulation unit provides hot water for the serpentine water pipe.
Further preferably, the groundwater seepage creating assembly further comprises a third water circulation unit, the top water tank and the bottom water tank are connected through the third water circulation unit, water collected by the bottom water tank passes through the third water circulation unit and returns to the top water tank again, and a filter is arranged in the water circulation unit between the bottom water tank and the top water tank and used for filtering water from the bottom water tank.
Further preferably, an overflow hole is formed in the side surface of the top water tank, and the overflow hole is connected with the third water circulation unit to prevent the top water tank from overflowing.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, possesses following beneficial effect:
1. the utility model is provided with a geothermal gradient building component, a groundwater seepage building component and a geological stratification building component, which respectively simulate the composite action of three factors of geothermal gradient, groundwater seepage and geological stratification, and accurately realize the simulation of the real geological environment of the buried pipe of the middle and deep layer, and is more practical; in addition, by changing the setting condition of one component or the setting conditions of a plurality of components, the composite action of a single geological condition or a plurality of geological conditions can be created, and the simulation of the action of different geological conditions on the buried pipe can be realized;
2. the utility model discloses in set up in the geological stratification and build the subassembly and divide into a plurality of regions with the sand box from vertical, each region is similar to one deck geological formation, turns into the vertical layering of actual geological formation into horizontal layering, on the one hand with the observation angle from vertical switching to horizontal, convenient operation and observation, on the other hand, also guaranteed with the correspondence of actual geological formation, laminate actual geological conditions;
3. the utility model provides a temperature and flow of water flow in the geothermal gradient building component can be freely adjusted according to actual needs so as to control the bottom heating layer to release heat, and one side of the sand box far away from the geothermal gradient building component is directly contacted with the atmospheric environment, so that the geothermal temperature gradient change curve when the middle-deep ground source heat pump is in different stratum depths can be more accurately fitted;
4. the utility model provides a groundwater seepage flow construction assembly can freely adjust opening, temperature and flow of rivers according to actual need to the heat transfer condition contrast when simulation deep ground source heat pump meets groundwater seepage flow with when not meeting groundwater seepage flow, and when meeting groundwater seepage flow the time groundwater is hot spring, cold spring, heat transfer condition contrast when general groundwater, can the effectual reduction experiment cost and reduce occupation space, have economic nature and model diversified, multi-functional characteristics;
5. the utility model provides a plurality of slots of sand box upper and lower surface setting freely adjust the interval and the figure of baffle according to actual need to fill different material geology filling material in to the geology interlayer, with this simulation geology layering condition that can be truer, and can effectual reduction experiment cost and reduce occupation space, have economic nature and the diversified, multi-functional characteristics of model.
Drawings
FIG. 1 is a schematic diagram of a mid-deep buried sand box experimental system constructed in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic illustration of a sand box constructed in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic structural view of a serpentine tube constructed in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic structural view of a top tank and bottom tank porous structure and gauze constructed in accordance with a preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of a sensor distribution constructed in accordance with a preferred embodiment of the present invention, wherein (a) the sensor distribution is in a cross-section of the flask; (b) schematic distribution of sensors in one side of the sand box; (c) a schematic diagram of sensor distribution in the partition; (d) the sensor distribution in the other side of the sand box is schematic;
fig. 6 is a schematic structural diagram of a socket constructed in accordance with a preferred embodiment of the present invention;
FIG. 7 is a schematic cross-sectional slot view of a flask constructed in accordance with a preferred embodiment of the present invention;
fig. 8 is a schematic view of the structure of a buried pipe in a sand box constructed according to a preferred embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-sand box, 2-serpentine water pipe, 3-filter, 4-gauze, 5-organic glass strip, 6-partition plate, 7-buried pipe, 8-support rod, 9-top water tank, 10-bottom water tank, 11-slot, 12-sensor, 13-heat insulation layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The utility model provides a middle-deep layer buried pipe sand box experimental system for simulating real geological conditions, which comprises a sand box 1, a geothermal gradient building component, a buried pipe unit, a groundwater seepage building component, a geological stratification building component and a data acquisition and control component;
as shown in fig. 1 and 2, the sand box 1 is provided with filling materials, the geological stratification building assembly comprises a plurality of partition plates for partitioning sandy soil in the sand box into a plurality of areas, different filling materials are arranged in each area so as to simulate different soil environments of geological layers at different depths, and the periphery of the sand box is provided with an insulating layer 13 for maintaining the temperature in the sand box;
the geothermal gradient building assembly is arranged on one side of the sand box and is used for conducting heat to the sand box from the side surface and then conducting heat one by one in the sand box, so that the temperature in each area in the sand box is different, and different temperatures of geological layers with different depths are simulated;
the underground water seepage building assembly comprises a top water tank 9 arranged above the sand box and a bottom water tank 10 arranged below the sand box, holes which are uniformly distributed are formed in the bottom of the top water tank 9 and the top of the bottom water tank 10, the top water tank 9 permeates water into a filling material in the sand box through the holes so as to simulate the environment condition with underground water seepage, and the bottom water tank 10 collects water seeped from the filling material through the holes in the top of the bottom water tank;
the buried pipe unit comprises a buried pipe and a first water circulation unit connected with the buried pipe, the buried pipe is buried in the center of sand of the sand box, a coaxial sleeve buried pipe is arranged in the buried pipe, one end of the first water circulation unit conveys water into an inner pipe of the coaxial sleeve buried pipe, and the water flows out from an outer pipe of the coaxial sleeve buried pipe after the coaxial sleeve buried pipe exchanges heat with a filling material outside the buried pipe; and measuring the temperature of water at the inlet and the outlet of the coaxial sleeve buried pipe to obtain the temperature difference, so as to obtain the heat exchange condition of the buried pipe in the sand box.
In the embodiment, the sand box 1 is composed of a wooden cuboid framework, a left side panel, a right side panel, a front panel, a rear panel and a heat insulation material layer; the assembly is built to the outside left side of sand box setting geothermol power gradient, and outside right side sets up buries a tub hydrologic cycle power subassembly, and the sand box center is arranged in to the buried pipe level, and the buried pipe is external to have first hydrologic cycle unit to be connected, and the subassembly setting is built in the groundwater seepage flow top and the bottom of sand box.
As shown in fig. 2, the geothermal gradient building element, the buried pipe unit and the groundwater seepage building element are all provided with water circulation, which is a second water circulation unit, a first water circulation unit and a third water circulation unit respectively, for providing circulating water for each element; a third water circulation of the underground water seepage building assembly is connected with the top water tank and the bottom water tank to realize the recycling of water, and a filter 3 is arranged between the bottom water tank and the top water tank and is used for filtering water entering the top water tank from the bottom water tank and avoiding impurities from entering the top water tank;
a serpentine water pipe is arranged in the geothermal gradient building component, and as shown in fig. 3, the serpentine water pipe 2 is uniformly laid on one side of the sand box, in this embodiment, on the left side of the sand box; the second water circulation unit is connected with the snake-shaped water pipe and used for conveying water with a certain temperature into the snake-shaped water pipe so as to heat the sand box;
as shown in fig. 4, gauze 4 is provided between the top water tank 9 and the flask and between the bottom water tank 10 and the flask, so that the filling material in the flask is prevented from entering the top water tank 9 and the bottom water tank 10.
As shown in fig. 5, (a) in fig. 5 is a schematic sectional view of the flask, and (b) in fig. 5 is a schematic sensor distribution diagram of the right side of the flask, that is, a plurality of sensors 12 are uniformly arranged on the diagonal line of the side plate on the side where the geothermal gradient building element is arranged, and are used for measuring the temperature at different positions on the side plate in real time, so as to monitor the heating temperature of the geothermal gradient building element and whether the heating is uniform; FIG. 5 (d) is a schematic diagram showing the arrangement of the sensors on the left side, i.e., the plurality of sensors 12 are uniformly arranged on the diagonal of the side plate of the flask on the side away from the geothermal gradient building unit for measuring the ambient temperature, humidity and atmospheric pressure. As shown in fig. 5 (c), a plurality of sensors 12 are uniformly distributed on the transverse and longitudinal central axes of the partition for real-time measurement of real-time temperatures at different positions.
As shown in fig. 6, a plurality of organic glass strips 5 are arranged at intervals on the top and the top of the flask to form a plurality of slots 11, and as shown in fig. 7, the number and the positions of the partition plates are changed by placing the partition plates 6 in different slots 11.
As shown in fig. 8, a buried pipe 7 is buried in the center of the sand box 1, and a plurality of support rods 8 are provided below the buried pipe to support the buried pipe to prevent it from sinking to the bottom of the sand box.
The utility model has the characteristics of can collect multiple experiment into one body to can effectual reduction experiment cost and reduce occupation space, have economic nature and model diversification, multi-functional, bury the simulation experiment of the heat transfer condition when the heat pump meets real geological conditions in the adaptation middle and deep layer. Is an innovative technology.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a simulation real geology condition's deep buried pipe sand box experimental system in, its characterized in that, this experimental system includes sand box (1), geological stratification builds subassembly, geothermol power gradient and builds subassembly, groundwater seepage flow and builds subassembly and buried pipe unit, wherein:
the geological stratification building assembly comprises a plurality of partition plates (6) and is used for partitioning sandy soil in the sand box to form a plurality of areas, and different filling materials are arranged in each area so as to simulate different soil environments of geological layers with different depths;
the geothermal gradient building component is arranged on one side of the sand box (1) and is used for conducting heat to the sand box from the side and then conducting heat from area to area in the sand box, so that the temperature in each area in the sand box is different, and different temperatures of geological layers in different depths are simulated;
the underground water seepage building assembly comprises a top water tank (9) arranged above the sand box and a bottom water tank (10) arranged below the sand box, holes which are uniformly distributed are formed in the bottom of the top water tank (9) and the top of the bottom water tank, the top water tank permeates water into a filling material in the sand box through the holes so as to simulate the condition that water seeps from a geological stratum, and the bottom water tank (10) collects the water seeped from the filling material through the holes in the top of the bottom water tank;
the buried pipe unit comprises a buried pipe (7) and a first water circulation unit connected with the buried pipe, the buried pipe (7) is buried in the center of sand of the sand box (1), the buried pipe is a coaxial sleeve buried pipe, one end of the first water circulation unit conveys water into an inner pipe of the coaxial sleeve buried pipe, and the water flows out of an outer pipe of the coaxial sleeve buried pipe after the coaxial sleeve buried pipe exchanges heat with a filling material outside the buried pipe; and measuring the temperature of water at the inlet and the outlet of the coaxial sleeve buried pipe to obtain a temperature difference, so as to obtain the heat exchange condition of the buried pipe in the sand box.
2. The sand box testing system for a middle-deep buried pipe for simulating real geological conditions as claimed in claim 1, further comprising a data collecting and controlling module connected to said geological stratification constructing module, geothermal gradient constructing module, groundwater seepage constructing module and buried pipe unit simultaneously for collecting and adjusting water temperature, soil temperature, environmental temperature, water flow and water pressure fed back from each module.
3. A middle depth buried pipe sand box experimental system simulating real geological conditions according to claim 1, characterized in that gauze is arranged between the top water tank (9) and the sand box (1) and between the bottom water tank (10) and the sand box (1), and the gauze has a mesh size smaller than the grain size of the filling material, so as to prevent the filling material in the sand box from entering the top water tank and the bottom water tank.
4. A sand box test system for medium and deep buried pipes simulating real geological conditions according to claim 1, wherein a plurality of slots (11) are provided on both the top and bottom of the sand box for receiving the partition plates (6), and geological layers of different relative thicknesses are simulated by changing the insertion positions and number of the partition plates by placing the partition plates in different slots.
5. The sand box experimental system for the middle deep buried pipe for simulating the real geological condition as claimed in claim 1, wherein a plurality of sensors (12) are uniformly arranged on the diagonal of the side plate of the sand box on the side where the geothermal gradient building module is arranged, for measuring the temperature at different positions on the side plate in real time, thereby monitoring the heating temperature of the geothermal gradient building module and whether the heating is uniform; a plurality of sensors (12) are uniformly distributed on the diagonal of the side plate of the sand box far away from one side of the geothermal gradient building component and are used for measuring the ambient temperature, the humidity and the atmospheric pressure.
6. The sand box experimental system for a middle-deep buried pipe for simulating real geological conditions as claimed in claim 1, wherein a plurality of sensors are uniformly distributed on the transverse and longitudinal central axes of said partition plate (6) for real-time measurement of real-time temperatures at different positions.
7. The sand box experimental system for the medium-deep-buried pipe simulating the real geological conditions as claimed in claim 1, wherein the periphery of the sand box (1) is provided with an insulating layer (13) for maintaining the temperature of the sand box.
8. The sand box experimental system for a medium depth buried pipe simulating real geological conditions as claimed in claim 1, wherein said geothermal gradient building module comprises a serpentine water pipe (2) attached to one side of said sand box and a second water circulation unit for supplying hot water to said serpentine water pipe.
9. The system for testing sand boxes for medium and deep ground level according to claim 1, wherein said groundwater seepage creating module further comprises a third water circulation unit, said top water tank and said bottom water tank are connected by said third water circulation unit, the water collected in said bottom water tank is returned to said top water tank through said third water circulation unit, and a filter (3) is disposed in the water circulation unit between said bottom water tank and said top water tank for filtering the water from said bottom water tank.
10. The sand box experimental system for a middle and deep buried pipe for simulating real geological conditions as claimed in claim 9, wherein an overflow hole is formed at an upper portion of a side surface of said top water tank, and said overflow hole is connected to said third water circulation unit to prevent said top water tank from overflowing.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116838335A (en) * | 2023-07-10 | 2023-10-03 | 中国石油大学(北京) | Multiphase seepage three-dimensional visual simulation device and method for well with complex structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116838335A (en) * | 2023-07-10 | 2023-10-03 | 中国石油大学(北京) | Multiphase seepage three-dimensional visual simulation device and method for well with complex structure |
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