Experimental device for circulating flow of slime water

Abstract

The utility model relates to the technical field of slime water flotation, and discloses a slime water circulating flow experimental device which comprises a water tank, a pressure sensor and a feeding pipe. The water tank is used for storing coal slime water with a constant liquid level; the pressure sensor and an outlet of the feeding pipe are both located below the liquid level of the water tank, the outlet of the feeding pipe is located over the pressure sensor and perpendicularly points to the pressure sensor, and the feeding pipe is used for conveying slime water with the same concentration into the water tank so that the pressure sensor can be scoured. Therefore, the experiment is completed by recording the impact pressure data collected by the pressure sensor. According to the utility model, the scouring condition of the slime water to the pressure sensor under the actual working condition can be accurately simulated, and the experiment can be completed by recording the impact pressure data, so that the key data related to the circulating flow of the slime water can be intuitively obtained; and a reliable basis is provided for follow-up research on coal slime water flow characteristics, influence on equipment and the like.

Description

Technical Field

[0001] This utility model relates to the field of coal slurry flotation technology, specifically a coal slurry water circulating flow experimental device. Background Technology

[0002] The main function of a thickener is to separate the coal slurry from coal mine washing, relying on gravity to settle the coal particles and impurities to the bottom of the tank. Currently, when operating thickener equipment, it is necessary to detect the concentration of the input coal slurry and control the separation and sedimentation time based on the concentration data to optimize the coal slurry treatment process.

[0003] Common methods for detecting coal slurry mainly include optical measurement and ultrasonic measurement. Both methods are susceptible to interference, affecting their accuracy. For example, the concentration and particle size of the coal slurry can interfere with the light transmission characteristics, and excessively high coal slurry concentration can weaken the linear relationship of ultrasonic attenuation. Therefore, researchers have begun to explore the relationship between the scouring (impact) effect of coal slurry and its concentration through experiments. Currently, there is a lack of an experimental device that can effectively simulate the scouring scenario of a thickener, and a lack of sufficient and reliable data, thus limiting research development. Utility Model Content

[0004] To address the technical problems existing in the prior art, this utility model provides a coal slurry water circulation experimental device, which accurately simulates the scouring of pressure sensors by coal slurry water under actual working conditions. This helps to intuitively obtain key data related to the circulation of coal slurry water, providing a reliable basis for subsequent research on the flow characteristics of coal slurry water and its impact on equipment.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model discloses an experimental device for circulating coal slurry water, including a water tank, a pressure sensor, and a feed pipe. The water tank is used to store coal slurry water at a constant level. The pressure sensor and the outlet of the feed pipe are both below the liquid surface of the water tank. The outlet of the feed pipe is located directly above the pressure sensor and points vertically towards the pressure sensor. The feed pipe is used to transport coal slurry water of the same concentration into the water tank to generate a scouring effect on the pressure sensor. The experiment is completed by recording the impact pressure data collected by the pressure sensor.

[0007] As a further improvement to the above scheme, the projection of the pressure sensor on the horizontal plane is completely covered by the projection of the feed pipe outlet on the horizontal plane.

[0008] As a further improvement to the above scheme, the distance between the feed pipe outlet and the pressure sensor, i.e. the impact distance, is adjustable.

[0009] As a further improvement to the above solution, the feed pipe is composed of multiple straight and bent sections joined together by flanges.

[0010] As a further improvement to the above scheme, the experimental device also includes a circulation component for achieving a constant liquid level in the water tank; the circulation component includes a discharge pipe, a coal slurry bucket, and a centrifugal pump; the inlet of the discharge pipe is connected to the bottom of the water tank, and the outlet of the discharge pipe is connected to the coal slurry bucket; the centrifugal pump is installed inside the coal slurry bucket, and the inlet of the centrifugal pump is located in the coal slurry water inside the coal slurry bucket, and the outlet of the centrifugal pump is connected to the inlet of the feed pipe.

[0011] As a further improvement to the above solution, the circulation assembly also includes a flow control valve disposed on the feed pipe.

[0012] As a further improvement to the above scheme, the experimental device also includes an experimental platform; the experimental platform has a double-layer structure, with the water tank set on the upper layer and the coal slurry bucket set on the lower layer, so as to create a height difference between the inlet and outlet of the discharge pipe.

[0013] As a further improvement to the above scheme, the experimental apparatus also includes a fixed bracket; the fixed bracket is fixed on the experimental platform and used to fix the feed pipe.

[0014] As a further improvement to the above solution, a scale for calibrating the liquid level is also provided on the outside of the water tank.

[0015] As a further improvement to the above scheme, the experimental apparatus also includes a universal force measuring instrument electrically connected to the pressure sensor and a power supply; the universal force measuring instrument is used to display the impact pressure data collected by the pressure sensor in real time; the power supply is used to power the universal force measuring instrument and / or the pressure sensor.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. The coal slurry water circulation experimental device disclosed in this utility model provides a relatively stable experimental environment by setting up a water tank to store coal slurry water at a constant level. The pressure sensor and the feed pipe outlet are below the liquid surface, and the feed pipe outlet is perpendicular to the pressure sensor and delivers coal slurry water of the same concentration to generate a scouring effect. This can more accurately simulate the scouring effect of coal slurry water on the pressure sensor under actual working conditions. The experiment is completed by recording the impact pressure data, which helps to intuitively obtain key data related to the circulation of coal slurry water and provides a reliable basis for subsequent research on the flow characteristics of coal slurry water and its impact on equipment.

[0018] 2. The projection of the pressure sensor on the horizontal plane of this experimental device is completely covered by the projection of the feed pipe outlet on the horizontal plane. This ensures that as much of the coal slurry flowing out of the feed pipe as possible acts on the pressure sensor, avoiding the coal slurry from being dispersed to other areas, which could lead to inaccurate data acquisition or poor experimental results. This makes the impact pressure received by the pressure sensor more reflective of the real and concentrated coal slurry flushing effect, thus improving the accuracy and reliability of the experimental data.

[0019] 3. The impact distance between the feed pipe outlet and the pressure sensor of this experimental device is adjustable, giving the device adjustability and flexibility. Since the actual structure of the coal slurry thickener may not be regular, the impact distance can be changed to simulate on-site conditions according to different research needs. For example, it can be used to study the effects of strong impacts at close range and weak impacts at long range on pressure sensor data, thereby expanding the applicability of the experimental device and enabling the acquisition of more comprehensive experimental data related to the circulation of coal slurry.

[0020] 4. Based on the aforementioned adjustable impact distance, the feed pipe of this experimental device is composed of multiple straight and bent sections connected by flanges, which facilitates the adjustment and modification of the length and direction of the feed pipe, thereby enabling the adjustment of the impact distance. At the same time, it provides convenience in terms of device installation, maintenance, and layout according to actual experimental sites and requirements, reduces the difficulty of device construction and modification, and improves the overall practicality.

[0021] 5. By setting up a circulation component, this experimental device ensures that the liquid level of the coal slurry remains stable throughout the entire experiment, avoiding interference from liquid level changes on the circulation flow of the coal slurry and the data collected by the pressure sensor. This makes the experimental conditions more consistent each time, thereby improving the repeatability and comparability of the experimental results, which is of great significance for accurately analyzing the circulation flow pattern of coal slurry. Attached Figure Description

[0022] Figure 1 This is a flowchart of the coal slurry water concentration detection method based on impact pressure feedback in Embodiment 1 of this utility model.

[0023] Figure 2 This is a three-dimensional structural diagram of the coal slurry water circulation experimental device in Embodiment 1 of this utility model.

[0024] Figure 3 This is a graph showing the relationship between the change in coal slurry water concentration and the change in impact pressure when the impact distance is 1m in Embodiment 2 of this utility model.

[0025] Figure 4 This is a graph showing the relationship between the change in coal slurry water concentration and the change in impact pressure when the impact distance is 1.5m in Embodiment 2 of this utility model.

[0026] Figure 5This is a graph showing the relationship between the change in coal slurry water concentration and the change in impact pressure when the impact distance is 2m in Embodiment 2 of this utility model.

[0027] Figure 6 This is a fitted graph of the change model when the impact distance is 1m in Embodiment 2 of this utility model.

[0028] Figure 7 This is a fitted graph of the variation model when the impact distance is 1.5m in Embodiment 2 of this utility model.

[0029] Figure 8 This is a fitted graph of the change model when the impact distance is 2m in Embodiment 2 of this utility model.

[0030] In the diagram: 1. Water tank; 2. Pressure sensor; 3. Feed pipe; 41. Discharge pipe; 42. Coal slurry bucket; 43. Flow control valve; 5. Experimental platform; 6. Fixed bracket; 7. Ruler; 8. General force measuring instrument; 9. Power supply. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1

[0033] Please see Figure 1 This embodiment provides a method for detecting coal slurry water concentration based on impact pressure feedback, including the following steps:

[0034] S1. Construct an experimental device for circulating coal slurry water.

[0035] Please see Figure 2 In this embodiment, the experimental device includes a water tank 1, a pressure sensor 2 and a feed pipe 3, and may also include a circulation component, an experimental platform 5, a fixed bracket 6, a universal force measuring instrument 8 and a power supply 9.

[0036] The water tank 1 is used to store coal slurry water at a constant level. A scale 7 for calibrating the liquid level is also installed on the outside of the water tank 1. Operators can observe the liquid level of the water tank 1 according to the scale 7. The water tank 1 can be fixed to the upper layer of the double-layer experimental platform 5.

[0037] Both the pressure sensor 2 and the outlet of the feed pipe 3 are below the liquid surface of the water tank 1. The outlet of the feed pipe 3 is located directly above the pressure sensor 2 and points vertically towards it, and the projection of the pressure sensor 2 on the horizontal plane is completely covered by the projection of the feed pipe 3 outlet on the horizontal plane. The feed pipe 3 is used to supply coal slurry water of the same concentration into the water tank 1 to create a scouring effect on the pressure sensor 2, thereby completing the experiment by recording the impact pressure data collected by the pressure sensor 2.

[0038] In this embodiment, the distance between the outlet of the feed pipe 3 and the pressure sensor 2, i.e., the impact distance, is adjustable. Specifically, the feed pipe 3 is composed of multiple straight and bent sections spliced ​​together by flanges. The number of straight and bent sections can be selected according to actual needs. In particular, when it is necessary to change the impact distance, the number of straight sections near the outlet of the feed pipe 3 can be adjusted to change its length. The feed pipe 3 can be clamped, fixed with cable ties, or glued using the fixing bracket 6 fixed on the experimental platform 5. This ensures that the feed pipe 3 will not shift due to the impact reaction force of the coal slurry during the experiment.

[0039] A circulation assembly is used to maintain a constant liquid level in the water tank 1. The circulation assembly includes a discharge pipe 41, a coal slurry water tank 42, and a centrifugal pump (not shown), as well as a flow control valve 43 installed on the inlet pipe 3. The inlet of the discharge pipe 41 is connected to the bottom of the water tank 1, and the outlet of the discharge pipe 41 is connected to the coal slurry water tank 42. The centrifugal pump is installed inside the coal slurry water tank 42, with its inlet located in the coal slurry water within the tank, and its outlet connected to the inlet of the inlet pipe 3. The flow rate at the outlet of the inlet pipe 3 can be adjusted by regulating the delivery power of the centrifugal pump in conjunction with the opening and closing degree of the flow control valve 43.

[0040] In this embodiment, the coal slurry water tank 42 can be placed on the lower layer, thereby creating a height difference between the inlet and outlet of the discharge pipe 41. This allows the coal slurry water in the water tank 1 to automatically flow back to the coal slurry water tank 42 through the discharge pipe 41 during experimental operation, achieving liquid circulation. Of course, when the experimental device is not running, the flow control valve 43 is completely closed, and due to pressure, the coal slurry water stored in the water tank 1 will also stop entering the coal slurry water tank 42.

[0041] The general-purpose force measuring instrument 8 and the power supply 9 are both electrically connected to the pressure sensor 2; the general-purpose force measuring instrument 8 is used to display the impact pressure data collected by the pressure sensor 2 in real time; the power supply 9 is used to supply power to the general-purpose force measuring instrument 8 and / or the pressure sensor 2.

[0042] Before step S2, the coal slurry particles in the coal slurry water conveyed by the feed pipe 3 are screened for particle size to ensure that they meet the particle size requirements of the coal slurry water inlet of the thickener.

[0043] Furthermore, the thickener testing is not conducted inside the thickener itself, but rather on the external coal slurry transport pipeline. This pipeline has two sections, and their junction is not connected, resulting in a height difference. The device is placed here. Therefore, in some embodiments, before step S2, a field survey is conducted on the layout of the thickener's feed pipeline to obtain the vertical distance between the outlet of the first feed pipe and the bottom wall of the second feed pipe directly below it. This distance is used to limit the maximum impact distance for the impact test, which relates to the permissible placement range of the pressure sensor 2.

[0044] In some embodiments, the accuracy of the pressure sensor 2 is also verified by using a qualified pressure sensor 2 for the impact test in step S2 and the field deployment in step S4; the specific process of the accuracy verification is as follows:

[0045] Place pressure sensor 2 in pure water or coal slurry water at a set depth and record the static pressure feedback value F0 of pressure sensor 2.

[0046] Calculate the actual water pressure value F, F = ρghs; where ρ is the density of the liquid on which pressure sensor 2 is placed; g is the acceleration due to gravity; h is the height of pressure sensor 2 above the liquid surface; and s is the surface area of ​​pressure sensor 2.

[0047] Calculate the relative error δ of pressure sensor 2.

[0048] Determine whether the relative error δ of pressure sensor 2 is lower than the preset error threshold. If it is, the accuracy of pressure sensor 2 is deemed qualified; otherwise, it is deemed unqualified.

[0049] S2. Multiple impact experiments are conducted using the experimental apparatus to obtain impact pressure data collected by pressure sensor 2 during the experiment. The different coal slurry concentrations delivered by the feed pipe 3 in each impact experiment are divided by a preset coal slurry concentration range. The coal slurry concentration delivered by the feed pipe 3 in each impact experiment is the same as the coal slurry concentration pre-stored in the water tank 1. Each impact experiment process meets the following preset conditions: the liquid level in the water tank 1, the fluid velocity in the feed pipe 3, and the distance between the outlet of the feed pipe 3 and the pressure sensor 2, i.e., the impact distance, are all kept uniform and constant.

[0050] In step S2, each impact experiment is repeated more than twice. For each experiment, the experimental data is recorded after the centrifugal pump at the inlet of the feed pipe starts for a preset time.

[0051] S3. Based on the coal slurry water concentration and corresponding impact pressure data from all impact experiments, fit a variation model to reflect the relationship between coal slurry water concentration and impact pressure.

[0052] In step S3, the expression for the change model is:

[0053]

[0054] In the formula, y is the coal slurry water concentration; x is the impact pressure; e is the natural constant; y0, A1, and t1 are constants obtained by fitting, and their values ​​will be given in subsequent embodiments.

[0055] S4. With reference to the experimental device and the preset conditions, deploy the same pressure sensor 2 in the thickener to obtain the real-time impact pressure data of the coal slurry water inlet of the thickener, and substitute the real-time impact pressure data into the change model to detect the real-time coal slurry water concentration.

[0056] This embodiment also provides a coal slurry water concentration detection system based on impact pressure feedback, which applies the coal slurry water concentration detection method based on impact pressure feedback as described above; the detection system includes: a coal slurry water circulation experimental device, a data acquisition module, and a data processing module.

[0057] The experimental apparatus for circulating coal slurry water can be directly applied to the above-mentioned experimental apparatus, and will not be described in detail again.

[0058] The data acquisition module is used to acquire the impact pressure data collected by the pressure sensor 2 during the experiment when multiple impact experiments are conducted using the experimental apparatus.

[0059] In some embodiments, the data acquisition module may include the general force measuring instrument 8 described above, and may also include components such as signal amplifiers and data acquisition cards, in order to stably transmit the impact pressure data collected by the pressure sensor 2 to the data processing module.

[0060] The data processing module is used to fit a variation model reflecting the relationship between coal slurry concentration and impact pressure based on the coal slurry concentration and corresponding impact pressure data of all impact experiments; the data processing module is also used to substitute the real-time impact pressure data into the variation model to detect the real-time coal slurry concentration.

[0061] In some embodiments, the data processing module is essentially a computer device, which may be a smartphone, tablet, laptop, desktop computer, rack server, blade server, tower server, or cabinet server, etc., that executes a program. The data processing module includes a processor and memory connected to the processor via a bus.

[0062] Example 2

[0063] This embodiment provides a method for detecting coal slurry water concentration based on impact pressure feedback, which, compared to Embodiment 1, provides specific experiments and verification processes.

[0064] 1. Particle size analysis was performed on the coal used in the experiment. The reason for the particle size analysis was that most of the coal slime particles entering the thickening tank were smaller than 0.5 mm. In order to ensure that the coal used in the experiment met the requirements, the coal was screened. The results are shown in Table 1. The results show that the coal used in the experiment met the requirements.

[0065] Table 1: Coal Slurry Particle Screening Experiment Table

[0066]

[0067] 2. Construct a controllable flow coal slurry water circulation experimental device. This device can adjust experimental conditions such as coal slurry water concentration, flow rate, and liquid level at any time. The specific structure is as described in Example 1 and will not be repeated here.

[0068] The concentration of coal slurry water can be adjusted by changing the amount of coal slurry added to the coal slurry water tank; the equipment can be operated simply by connecting a centrifugal pump and an adjustable DC regulated power supply; the liquid flow can be adjusted by a flow control valve; a scale is attached to the water tank, which can be used to change the liquid level and impact height according to experimental requirements.

[0069] 3. Place a pressure sensor with the same surface area as the one used on-site in the device. The inlet area should be much larger than the sensor surface area to ensure that the sensor surface is completely covered by fluid. In addition, the flow velocity of the on-site feed pipe is calculated to be 0.63 m / s. Adjust the flow control valve to maintain the fluid velocity in the feed pipe at around 0.63 m / s. Adjust the delivery flow rate of the circulation component to maintain the liquid level in the tank at about 1 m. Keep the distance between the feed inlet and the pressure sensor at 1 m, 1.5 m, and 2 m respectively. The preliminary preparations for the experiment are complete.

[0070] 4. To ensure sensor accuracy, place the sensor in 1m of pure water and record the static pressure feedback value; the water pressure can be directly calculated using a common formula, as follows:

[0071] F = ρghs

[0072] In the formula, F is the pressure in N; ρ is the liquid density in kg / m³. 3 g is the acceleration due to gravity, in m / s². 2 Take 9.8 m / s 2 h is the height of the sensor above the liquid surface, in meters; s is the surface area of ​​the sensor, in square meters. 2 .

[0073] In this embodiment, ρ = 1000 kg / m 3 g = 9.8 m / s 2 h = 1m, s = 0.00071m 2 Substituting into the formula, we get F = 6.93 N.

[0074] The actual recorded value of the sensor was 6.91N, and the error between the two was less than 0.3%, indicating that the sensor accuracy fully meets the requirements of practical applications.

[0075] 5. Establish a model of impact pressure-coal slurry concentration variation based on the acquired data.

[0076] The relationship between the change in coal slurry concentration and the change in pressure value when the distance between the feed pipe outlet and the sensor is 1m is as follows: Figure 3 As shown, the experiment was repeated three times to avoid randomness.

[0077] Depend on Figure 3 The results show that the curves obtained from the three experiments have a clear consistency, indicating that there is a correlation between the impact pressure and the change in coal slurry concentration.

[0078] The relationship between the change in coal slurry concentration and the change in pressure value when the distance between the feed pipe outlet and the sensor is 1.5m is as follows: Figure 4 As shown, the experiment was repeated three times to avoid randomness.

[0079] Depend on Figure 4 The results show that, summarizing the results of multiple experiments, there is a clear pattern between the changes in coal slurry concentration and pressure; and it is consistent with... Figure 3 The curves shown have similar trends, with the only significant difference being the pressure.

[0080] The relationship between the change in coal slurry concentration and the change in pressure value when the distance between the feed pipe outlet and the sensor is 2m is as follows: Figure 5 As shown, the experiment was repeated three times to avoid randomness.

[0081] Depend on Figure 5 The results show that changing the distance between the feed pipe outlet and the sensor affects the impact pressure; as the distance increases, the pressure decreases. Figure 3 , Figure 4 A comparison reveals that, although Figure 5 The pressure also decreased, but all three showed a consistent pattern of change.

[0082] Impact pressure-coal slurry concentration variation models were derived by fitting pressure changes and coal slurry concentration changes at 1m, 1.5m, and 2m depths, respectively. The fitted graphs of the models are shown below. Figure 6 , 7 As shown in Figure 8.

[0083] The general formula for the fitted model is:

[0084] When the distance between the feed pipe outlet and the pressure sensor is 1m, the fitted graph is as follows: Figure 6 As shown, the expression for the change model is:

[0085] y = -23.954 + 10.022e -x / -42.134

[0086] Where y is the coal slurry water concentration, g / L; x is the impact pressure, N; and the remaining parameters are obtained through fitting.

[0087] When the distance between the feed pipe outlet and the pressure sensor is 1.5m, the fitted graph is as follows: Figure 7 As shown, the expression for the change model is:

[0088] y = -29.029 + 15.023e -x / -48.309

[0089] When the distance between the feed pipe outlet and the pressure sensor is 2m, the fitted graph is as follows: Figure 8 As shown, the expression for the change model is:

[0090] y = -32.191 + 18.838e -x / -51.406

[0091] 6. Collect actual data on-site for model verification.

[0092] The same sensor was brought to the site for installation and testing. According to the on-site survey, due to the limitations of the actual terrain, the pressure sensor can be placed 1.5m away from the inlet of the feed pipe (vertical distance). After debugging, the pressure sensor feedback values ​​were collected. The data was substituted into the fitting model at 1.5m to obtain the coal slurry concentration. The detailed values ​​are shown in Table 2.

[0093] Table 2: Numerical Statistics

[0094]

[0095] After communicating with the thickener production site, it was determined that an error range of no more than 10% would meet the actual application requirements. According to the results shown in Table 2, the results clearly meet the requirements.

[0096] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An experimental device for circulating coal slurry water, characterized in that, It includes a water tank (1), a pressure sensor (2), and a feed pipe (3); the water tank (1) is used to store coal slurry water at a constant level; the outlets of the pressure sensor (2) and the feed pipe (3) are both below the liquid surface of the water tank (1), the outlet of the feed pipe (3) is located directly above the pressure sensor (2) and points vertically towards the pressure sensor (2), and the feed pipe (3) is used to transport coal slurry water of the same concentration into the water tank (1) to generate a flushing effect on the pressure sensor (2).

2. The experimental device for circulating coal slurry water according to claim 1, characterized in that, The projection of the pressure sensor (2) on the horizontal plane is completely covered by the projection of the feed pipe (3) outlet on the horizontal plane.

3. The experimental device for circulating coal slurry water according to claim 1, characterized in that, The distance between the feed pipe (3) outlet and the pressure sensor (2), i.e. the impact distance, is adjustable.

4. The experimental device for circulating coal slurry water according to claim 3, characterized in that, The feed pipe (3) is composed of multiple straight pipes and bends joined together by flanges.

5. An experimental apparatus for circulating coal slurry water according to any one of claims 1 to 4, characterized in that, It also includes a circulation assembly for achieving a constant liquid level in the water tank (1); the circulation assembly includes a discharge pipe (41), a coal slurry bucket (42) and a centrifugal pump; the inlet of the discharge pipe (41) is connected to the bottom of the water tank (1), and the outlet of the discharge pipe (41) is connected to the coal slurry bucket (42); the centrifugal pump is located inside the coal slurry bucket (42), and the inlet of the centrifugal pump is located in the coal slurry water inside the coal slurry bucket (42), and the outlet of the centrifugal pump is connected to the inlet of the feed pipe (3).

6. The experimental device for circulating coal slurry water according to claim 5, characterized in that, The circulation assembly also includes a flow control valve (43) disposed on the feed pipe (3).

7. The experimental device for circulating coal slurry water according to claim 5, characterized in that, It also includes an experimental platform (5); the experimental platform (5) has a double-layer structure, with a water tank (1) on the upper layer and a coal slurry bucket (42) on the lower layer, so that the inlet and outlet of the discharge pipe (41) have a height difference.

8. The experimental device for circulating coal slurry water according to claim 7, characterized in that, It also includes a fixing bracket (6); the fixing bracket (6) is fixed on the experimental platform (5) and used to fix the feed pipe (3).

9. A coal slurry water circulation experimental device according to any one of claims 1 to 4, characterized in that, A scale (7) for calibrating the liquid level is also provided on the outside of the water tank (1).

10. An experimental apparatus for circulating coal slurry water according to any one of claims 1 to 4, characterized in that, It also includes a general-purpose force measuring instrument (8) electrically connected to the pressure sensor (2) and a power supply (9); the general-purpose force measuring instrument (8) is used to display the impact pressure data collected by the pressure sensor (2) in real time; the power supply (9) is used to supply power to the general-purpose force measuring instrument (8) and / or the pressure sensor (2).

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