A box-type experimental device for simulating underground aquifer energy storage system

Abstract

The present invention provides a box-type experimental device for simulating an underground aquifer energy storage system, comprising a box-type frame; a displacement pump and a conduit are arranged at one end of the box-type frame; an artificial aquifer is arranged in the box-type frame, and an overlying impermeable layer and an underlying impermeable layer are respectively arranged above and below the artificial aquifer; a flow rate and temperature meter of a fluid flowing into the artificial aquifer; the advantages of the device are as follows: the permeability and porosity of the artificial aquifer can be adjusted, and the energy storage efficiency of different types of aquifers can be studied. The temperature of the artificial aquifer in all directions can be monitored in real time, and the energy storage effect of the aquifer can be evaluated. The artificial aquifer is covered with an impermeable layer with low thermal conductivity above and below, which is used to simulate real formation conditions. The flow rate of the produced hot water can be flexibly controlled to study the heat recovery rate of the aquifer heat storage system. It can realize the study of different parameters of various underground aquifers, and has a wide range of applications.

Description

Technical Field

[0001] The invention specifically relates to a box-type experimental device for simulating an underground aquifer energy storage system. Background Art

[0002] In thermal storage engineering experiments, there is no box-type experimental device specifically designed to simulate underground aquifer energy storage systems. At present, the most commonly used method for studying underground aquifer energy storage systems is numerical simulation. There is still a lack of engineering projects in this field in China, and there is a lack of field engineering parameter data on underground aquifer energy storage systems, making it difficult to verify the accuracy of numerical simulation methods. In particular, the formation parameters of aquifers in different regions vary greatly. The use of box-type experimental devices can simulate the formation characteristics of aquifers in different regions, which can more effectively study the operation mechanism of underground aquifer energy storage systems.

[0003] At present, there is no experimental device on the market that simulates the underground aquifer energy storage system, which has a serious impact on the research on underground aquifer energy storage. The box-type experimental device used in the present invention to simulate the underground aquifer energy storage system can freely select and adjust the physical properties of the aquifer, the energy storage space of the aquifer, the temperature of the aquifer, the flow rate of the fluid in the aquifer, the flow rate and temperature of the injected fluid during heat storage, and the heat extraction rate during heat extraction. It can also monitor the temperature at different locations and depths of the aquifer, and can study the impact of different parameters on the underground aquifer energy storage system. Summary of the invention

[0004] The purpose of the present invention is to provide a box-type experimental device for simulating an underground aquifer energy storage system in view of the deficiencies in the prior art, and the box-type experimental device for simulating an underground aquifer energy storage system can well solve the above-mentioned problems.

[0005] In order to achieve the above requirements, the technical solution adopted by the present invention is: to provide a box-type experimental device simulating an underground aquifer energy storage system, the box-type experimental device simulating an underground aquifer energy storage system comprises a box-type frame; a displacement pump and a conduit are arranged at one end of the box-type frame; an artificial aquifer is arranged in the box-type frame, the artificial aquifer is composed of sand layers of different properties and different particle sizes, and an overlying impermeable layer and an underlying impermeable layer are arranged above and below the artificial aquifer respectively; a flow rate and temperature meter of the fluid flowing into the artificial aquifer; a flow meter and a temperature meter are arranged at the bottom of the box-type frame ... There is a heating layer, and the box-type frame is wrapped with an insulation layer to prevent the heat inside the box from being lost; a number of groups of thermocouples are arranged in the upper part of the box-type frame to measure the temperature of each part of the artificial aquifer; an injection pipe, a water injection pump, and a hot water source are arranged at the upper end of the box-type frame close to the displacement pump to inject hot water into the artificial aquifer and control the injection flow; a heat extraction pipe, a water pump, a heat collection and temperature measurement device are arranged at the upper end of the box-type frame away from the displacement pump to extract the fluid in the artificial aquifer and control the extraction flow

[0006] The advantages of the box-type experimental device simulating the underground aquifer energy storage system are as follows:

[0007] (1) This device can flexibly adjust the temperature, flow rate, ion concentration, etc. of hot water injected into the artificial aquifer, and can be used to study the operating mechanism of the aquifer energy storage system.

[0008] (2) The device can monitor the temperature of artificial aquifers in real time and evaluate the energy storage effect of the aquifers.

[0009] (3) The artificial aquifer in this device is covered with low thermal conductivity impermeable layers above and below to simulate real formation conditions.

[0010] (4) This device can flexibly control the flow rate of produced hot water and is used to study the heat recovery rate of aquifer heat storage systems.

[0011] (5) The present invention can realize the study of different parameters of various underground aquifers and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The same reference numerals are used in these drawings to represent the same or similar parts. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0013] Figure 1 The structural diagram of a box-type experimental device for simulating an underground aquifer energy storage system according to an embodiment of the present application is schematically shown.

[0014] Figure 2 A top view of a box-type experimental device simulating an underground aquifer energy storage system according to an embodiment of the present application is schematically shown.

[0015] Figure 3 A side view of a box-type experimental device simulating an underground aquifer energy storage system according to an embodiment of the present application is schematically shown.

[0016] Among them: 1: displacement pump; 2: conduit; 3: thermal insulation layer; 4: overlying impermeable layer; 5: thermocouple; 6: injection pipe; 7: water injection pump; 8: hot water source; 9: heat extraction pipe; 10: water pump; 11: heat collection and temperature measurement device; 12: wire; 13: flow and temperature meter; 14: computer; 15: heating layer; 16: artificial aquifer; 17: underlying impermeable layer; 18: box frame. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present application more clear, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] In the following description, references to "one embodiment", "an embodiment", "an example", "an example", etc. indicate that the embodiment or example described in this way may include specific features, structures, characteristics, properties, elements or limitations, but not every embodiment or example necessarily includes the specific features, structures, characteristics, properties, elements or limitations. In addition, repeated use of the phrase "according to one embodiment of the present application" may refer to the same embodiment, but does not necessarily refer to the same embodiment.

[0019] For the sake of simplicity, certain technical features well known to those skilled in the art are omitted in the following description.

[0020] According to one embodiment of the present application, a box-type experimental device simulating an underground aquifer energy storage system is provided, such as Figure 1-3 As shown, a displacement pump 1 and a conduit 2 are arranged at one end, which are used to uniformly inject the prepared formation water into the artificial aquifer 16 in the box frame 18. The fluid passing through the artificial aquifer 16 will flow into the flow and temperature meter 13. The flow and temperature meter 13 can be used to detect the flow and temperature of the fluid in the artificial aquifer 16 in real time; the artificial aquifer 16 in the box frame 18 is respectively provided with an overlying impermeable layer 4 and an underlying impermeable layer 17 with low thermal conductivity and permeability, so as to ensure that the fluid injected into the artificial aquifer 16 will not flow out and the temperature will not be lost; a heating layer 15 is arranged at the bottom of the box frame 18, which is used to apply a corresponding temperature to the artificial aquifer 16 inside the box frame 18; the entire box frame 18 is The box is wrapped with a thermal insulation layer 3 to prevent heat loss inside the box; 15 groups of thermocouples 5 are arranged on the upper part of the box frame 18 to measure the temperature of each part of the artificial aquifer 16; an injection pipe 6, a water injection pump 7, and a hot water source 8 are arranged at one end of the upper near-displacement pump 1 of the box, which are used to inject hot water into the artificial aquifer 16 and can control the injection flow; a heat extraction pipe 9, a water pump 10, and a heat collection and temperature measuring device 11 are arranged at one end of the upper far-displacement pump 1 of the box frame 18, which are used to extract the fluid in the artificial aquifer 16 and can control the extraction flow; the thermocouple 5 and the flow and temperature meter 13 are connected to the computer 14, and the flow and temperature data of the entire experimental device will be transmitted to the computer 14 in real time for display.

[0021] According to one embodiment of the present application, in the box-type experimental device simulating the underground aquifer energy storage system, the temperature of the hot water injected into the injection pipe 6 is greater than the temperature of the fluid in the artificial aquifer 16 .

[0022] In the present device, the displacement pump 1 can inject fluid into the artificial aquifer 16 at a set speed.

[0023] According to one embodiment of the present application, in the box-type experimental device simulating the underground aquifer energy storage system, the water injection pump 7 can inject fluid into the artificial aquifer 16 at a set speed.

[0024] According to one embodiment of the present application, in the box-type experimental device simulating the underground aquifer energy storage system, the water pump 10 can extract fluid from the artificial aquifer 16 at a set speed.

[0025] According to an embodiment of the present application, the box-type experimental device simulating the underground aquifer energy storage system is placed in the center, and the thermocouple 5 can monitor the temperature of each part of the artificial aquifer 16 in real time.

[0026] According to one embodiment of the present application, the specific use of the box-type experimental device simulating the underground aquifer energy storage system includes the following steps:

[0027] Step 1: Preparation before the experiment. Prepare the aquifer mechanism characteristics and sand particles of different properties and particle sizes to be studied, and fill them into the box frame 18 as the artificial aquifer 16. Prepare sufficient water sources in the displacement pump and hot water source 8. Turn on the heating layer 15 to heat the artificial aquifer 16 in the box frame 18 to the set temperature. Turn on the displacement pump 1 and inject the prepared groundwater into the artificial aquifer 16. When the thermocouple 5 and the flow and temperature meter 13 show that the temperature and flow of the artificial aquifer 16 and the fluid in the artificial aquifer 16 are stable, start the next step.

[0028] Step 2: Water injection and heat storage. Turn on the water injection pump 7, and inject the hot water in the hot water source 8 into the artificial aquifer 16 through the injection pipe 6. At this time, the temperature of the artificial aquifer 16 will change. The temperature changes of various parts of the artificial aquifer 16 will be measured in real time by the thermocouple 5 and transmitted to the computer 14 for storage.

[0029] Step 3: Collect water and heat. Turn off the water injection pump 7 and turn on the water pump 10. The fluid in the artificial aquifer 16 is collected through the heat collection pipe 9 and sent to the heat collection and temperature measurement device 11. During the heat collection process, the temperature changes of various parts of the artificial aquifer 16 will be measured in real time by the thermocouple 5 and transmitted to the computer 14 for storage. The temperature of the collected fluid will be measured in the heat collection and temperature measurement device 11.

[0030] According to one embodiment of the present application, the box-type experimental device simulating the underground aquifer energy storage system can use heated hot water to increase the aquifer heat storage temperature, and can use thermocouples to monitor the temperature of various parts of the aquifer in real time; at the same time, it can use artificial aquifers to simulate the operation process of the underground aquifer heat storage system and study the operation mechanism of the aquifer energy storage system, such as the injected hot water flow and temperature, the injected hot water ion concentration, etc.

[0031] According to one embodiment of the present application, the artificial aquifer of the box-type experimental device simulating the underground aquifer energy storage system is composed of sand layers of different properties and different particle sizes. The artificial aquifer is covered with impermeable layers with low thermal conductivity on the top and bottom to simulate real formation conditions; and a heating layer is arranged under the entire box-type model, which can heat the entire box-type model so that it can be in a constant temperature state before the experiment; at the same time, the entire box-type model is wrapped with a thermal insulation layer to effectively reduce heat loss during the experiment; the heat extraction pipe is used to simulate heat extraction from the aquifer, and can flexibly control the flow rate of the extracted hot water, which can be used to study the heat recovery rate of the aquifer heat storage system.

[0032] The above-mentioned embodiments only represent several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the claims.

Claims

1. A box-type experimental device for simulating an underground aquifer energy storage system, characterized in that: Includes box frame; A displacement pump and a conduit are provided at one end of the box-type frame; An artificial aquifer is arranged in the box-type frame, the artificial aquifer is composed of sand layers of different properties and different particle sizes, and an overlying impermeable layer and an underlying impermeable layer are arranged above and below the artificial aquifer respectively; a flow rate and temperature meter of fluid inflow through said artificial aquifer; A heating layer is installed at the bottom of the box frame, and the box frame is wrapped by a heat-insulating layer to prevent the heat inside the box from being lost; A group of thermocouples are arranged in the upper part of the box-type frame for measuring the temperature of each part of the artificial aquifer; An injection pipe, a water injection pump, and a hot water source are provided at one end of the upper end of the box-type frame close to the displacement pump, for injecting hot water into the artificial aquifer and controlling the injection flow rate; The upper end of the box-type frame is provided with a heat extraction pipe, a water pump, a heat collection and temperature measurement device at one end away from the displacement pump, which is used to extract the fluid in the artificial aquifer and control the extraction flow rate; The overlying impermeable layer and the underlying impermeable layer are both made of materials with low thermal conductivity and permeability to ensure that the fluid injected into the artificial aquifer will not flow out and the temperature will not be lost.

2. The box-type experimental device for simulating underground aquifer energy storage system according to claim 1, characterized in that: The flow and temperature meter is used to detect the flow and temperature of the fluid in the artificial aquifer in real time.

3. The box-type experimental device for simulating underground aquifer energy storage system according to claim 1, characterized in that: The displacement pump and the conduit are used to uniformly inject the prepared formation water into the artificial aquifer in the box-type frame.

4. The box-type experimental device for simulating underground aquifer energy storage system according to claim 1, characterized in that: The heating layer is used to apply temperature to the artificial aquifer inside the box-like frame.

5. The box-type experimental device for simulating underground aquifer energy storage system according to claim 1, characterized in that: The thermocouple, flow rate and temperature meter are all connected to the computer, and the flow rate and temperature data of the entire experimental device will be transmitted to the computer in real time for display.

6. The box-type experimental device for simulating underground aquifer energy storage system according to claim 1, characterized in that: The temperature of the hot water injected into the injection pipe is higher than the temperature of the fluid in the artificial aquifer.

7. The box-type experimental device for simulating underground aquifer energy storage system according to claim 1, characterized in that: The water pump is used to extract fluid from the artificial aquifer at a set speed.

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