In-situ leaching uranium extraction well pipeline loss measuring device and calculating method

Abstract

The invention mainly belongs to the technical field of in-situ leaching uranium mining, and relates to an in-situ leaching uranium mining liquid extraction well pipeline loss measuring device and a calculating method. A liquid pumping well pipeline can generate certain resistance loss in the leaching liquid conveying process, however, the resistance loss is difficult to solve through theoretical calculation, and an empirical formula under the corresponding condition needs to be obtained through an actual measurement test. The device comprises a flow adjusting module, a liquid conveying main pipeline, a measuring branch pipeline and a three-way valve. The flow adjusting module is connected with the main infusion pipeline, and the measuring branch pipeline is connected with the main infusion pipeline through a three-way valve. And the measuring branch pipelines are respectively provided with a straight pipeline, a square elbow and a variable diameter. Pressure sensors are respectively arranged at two ends of the measuring branch pipeline. The method comprises the following steps: recording the pressure difference of a measuring branch pipeline under different flows, obtaining the resistance loss through a formula, drawing a graph with a corresponding flow relationship, fitting by adopting a polynomial and a power expression to obtain a formula, and substituting a flow value into the formula according to actual requirements to obtain a resistance loss value.

Description

Technical Field

[0001] The present invention relates to the technical field of in-situ leaching uranium, and in particular to a device and method for measuring the loss of a pipeline in an in-situ leaching uranium extraction well. Background Art

[0002] In-situ uranium leaching process is a typical fluidized mining process, and the lifting system of the leachate is a crucial link. The leachate lifting system is responsible for extracting the uranium-containing leachate from the underground ore body and transporting it to the surface processing facilities through pipelines. However, in the process of transporting the leachate in the pumping well pipeline, there are factors such as flow friction and fluid viscosity, which will produce a certain resistance loss. The resistance loss is related to factors such as the flow rate of the fluid, the length of the pipeline, the size of the pipe diameter, the form and number of elbows, the reducer, the valve, and the roughness of the pipeline wall; and because the parameters such as the lowering position of the submersible pump, the length of the pipeline, the terrain height difference, and the pumping flow rate of each pumping well in the in-situ leaching area are different, the pipeline resistance loss that the submersible pump needs to overcome to transport the leachate to the centralized control room is also different. The size of the pipeline resistance loss directly affects the industrial production of in-situ uranium leaching. At present, domestic in-situ leaching mines have not paid enough attention to this issue, especially the important role of the pipeline loss parameter in the selection of submersible pumps, the optimization and adjustment of submersible pump operating parameters, and the selection of lifting pipes and surface pipes.

[0003] The resistance loss of the pipeline of the in-situ leaching pumping well includes two parts: the along-the-way resistance loss and the local resistance loss. The along-the-way resistance loss involves the calculation of the turbulence of the pipeline. The along-the-way resistance coefficient in engineering practice cannot be strictly derived from theory like laminar flow. It is of practical significance to obtain the along-the-way head loss under actual conditions through field tests; there are many forms of local resistance loss of fluid in the pipeline (variable diameter, elbow, valve, etc.). Since the fluid is in a turbulent state, to obtain the accurate value of local loss in various places, actual measurement experiments must be carried out. The data and formulas introduced in various documents and manuals can only be used as reference. Therefore, for the specific engineering application scenarios of in-situ uranium leaching, the pipeline resistance loss of the leaching solution lifting system can only obtain real and usable data through field experiments. Up to the present invention, the field of in-situ uranium leaching has not established a device and method for measuring pipeline resistance loss.

[0004] In view of the above problems, a device and calculation method for measuring the pipeline resistance loss of in-situ leaching uranium extraction wells under different flow conditions are provided to provide data support for the layout of the control room of in-situ leaching uranium well site, the selection and operating condition adjustment of submersible pumps, and the selection of riser and surface pipes, which has important engineering application value. Summary of the invention

[0005] The purpose of the present invention is to provide a device and a calculation method capable of measuring the pipeline resistance loss of a pumping well under different flow conditions, and to construct a measured formula for calculating the pipeline resistance loss of an in-situ leaching uranium pumping well.

[0006] The solution of the present invention is:

[0007] 1. A device for measuring pipeline loss in an in-situ leaching uranium extraction well, comprising a flow regulating module, a liquid delivery main pipeline, a measuring branch pipeline, and a three-way valve; the flow regulating module is connected to the liquid delivery main pipeline, and the measuring branch pipeline is connected to the liquid delivery main pipeline through a three-way valve; there are three measuring branch pipelines, including a first measuring branch pipeline, a second measuring branch pipeline, and a third measuring branch pipeline; the three-way valve includes a first three-way valve and a second three-way valve; the first measuring branch pipeline is provided with a straight pipeline with a length of L, the second measuring branch pipeline is provided with N elbows, and the third measuring branch pipeline is provided with N reducers.

[0008] The flow regulating module comprises a frequency converter, a submersible pump and a water tank. The frequency converter is connected to the submersible pump via a power supply cable, and the submersible pump is placed in the water tank.

[0009] The main infusion pipeline is connected to a submersible pump, and an electromagnetic flowmeter is arranged on the main infusion pipeline.

[0010] One end of the first three-way valve is connected to the main infusion pipeline, and the other end is connected to the third measurement branch pipeline; one end of the second three-way valve is connected to the first measurement branch pipeline, and the other end is connected to the second measurement branch pipeline, and the two three-way valves are connected by pipelines.

[0011] A pressure sensor is respectively arranged at both ends of the first measuring branch pipeline; a pressure sensor is respectively arranged at both ends of the second measuring branch pipeline; and a pressure sensor is respectively arranged at both ends of the third measuring branch pipeline.

[0012] A method for calculating pipeline loss in an in-situ leaching uranium extraction well comprises the following steps:

[0013] Step 1: Measure the resistance loss along the first measuring branch pipeline at different flow rates, adjust the three-way valve to ensure that the first measuring branch pipeline is flowing and the other two measuring branch pipelines are closed; start the submersible pump, adjust the frequency converter, and record the readings P of the pressure sensors at both ends of the first measuring branch pipeline under different readings of the electromagnetic flowmeter. i1 , P i2 .

[0014] Step 2: Based on the known parameters of the first measuring branch pipeline, calculate the resistance loss per 100 meters along the first measuring branch pipeline at different flow rates.

[0015] Step 3: Measure the local resistance loss of the second measuring branch pipeline at different flow rates, adjust the three-way valve to ensure that the second measuring branch pipeline is flowing and the other two measuring branch pipelines are closed; adjust the frequency converter and record the readings of the pressure sensors at both ends of the second measuring branch pipeline under different readings of the electromagnetic flowmeter, P i3 , P i4, the pressure difference between the two ends, △Pi=P i3 -P i4 , MPa.

[0016] Step 4: Based on the known parameters of the second measuring branch pipeline, calculate the local resistance loss of a single elbow of the second measuring branch pipeline at different flow rates.

[0017] Step 5: Measure the local resistance loss of the third measuring branch pipeline at different flow rates, adjust the three-way valve to ensure that the third measuring branch pipeline is flowing and the other two measuring branch pipelines are closed; adjust the frequency converter and record the readings P of the pressure sensors at both ends of the third measuring branch pipeline under different readings of the electromagnetic flowmeter. i5 , P i6 , the pressure difference between the two ends, △Pi=P i5 -P i6 , MPa.

[0018] Step 6: Based on the known parameters of the third measuring branch pipeline, calculate the local resistance loss of a single variable diameter of the third measuring branch pipeline at different flow rates.

[0019] Step 7: Plot the relationship between the resistance loss calculated in steps 2, 4, and 6 and the corresponding flow rate, and use polynomial and power equation methods to fit and obtain the corresponding formula.

[0020] Step 8: According to the actual calculation requirements, substitute the corresponding flow value into the formula obtained in step 7 to obtain the resistance loss value.

[0021] The method for calculating the resistance loss along the first measuring branch pipeline at different flow rates in step 2 is:

[0022] Flow rate Q flowing through the first measuring branch pipeline i , m 3 / h; inner diameter of the infusion tube D, m; length of the first measuring branch line L, pressure difference at both ends, △Pi, MPa;

[0023] Each corresponding Q i The flow rate in the infusion tube is v i , m / s;

[0024]

[0025] ΔP i =P i1 -P i2 (2)

[0026] According to the hydraulic theory formula: ΔP=h f ·ρg, each corresponding to Q i The resistance loss along the infusion tube is (Formula 3):

[0027]

[0028] The resistance loss of the infusion tube along the 100-meter route is:

[0029]

[0030] The resistance coefficient along the first measuring branch pipeline 6 is:

[0031]

[0032] The method for calculating the resistance loss along the second measuring branch pipeline at different flow rates in step 4 is as follows:

[0033] Flow rate Q flowing through the second measuring branch pipeline i , m 3 / h, the pressure difference at both ends of the elbow component on the second measuring branch pipe is △Pi;

[0034] The local resistance loss of the elbow in the second measuring branch pipeline (Formula 6):

[0035]

[0036] The local resistance loss of a single elbow is further obtained (Equation 7), where N is the number of elbows on the second measurement branch pipeline;

[0037]

[0038] The method for calculating the resistance loss along the third measuring branch pipeline at different flow rates in step 6 is:

[0039] The flow rate Q flowing through the third measuring branch is known i , m 3 / h, the pressure P at both ends of the reducer on the third measuring branch pipe i5 , P i6 The principle of calculating the local loss of the elbow is the same as that of calculating the local loss of the elbow. Formula 6 is used to calculate the local loss of the third measuring branch pipeline at the corresponding flow rate, and Formula 7 is used to calculate the local loss of a single variable diameter.

[0040] The beneficial effects of the present invention are:

[0041] Aiming at the specific engineering problem of measuring and calculating the resistance loss of the lifting system of the uranium in-situ leaching solution, the device of the present invention is adopted to adjust the flow of the submersible pump by a frequency converter, measure the flow by an electromagnetic flowmeter, and measure the pressure value at different positions by a pressure gauge, and obtain the resistance loss on three paths under different flow conditions, solving the actual measurement and calculation problem of the resistance loss along the pipeline under turbulent flow conditions in the in-situ leaching uranium production process, and at the same time solving the measurement and calculation problem of the local loss caused by the elbow and diameter change in the in-situ leaching uranium extraction system. It can accurately calculate the pipeline resistance loss in the lifting system of the extraction well under different flow conditions, and provide data support for the selection and working condition adjustment of the submersible pump, the selection of the lifting pipe and the surface pipe, and the calculation of the dynamic water level based on the operating parameters of the submersible pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of a device for measuring pipeline loss in in-situ leaching uranium extraction wells

[0043] Figure 2 Relationship diagram between pipe resistance per hundred meters and flow rate under specific embodiment

[0044] Figure 3 Relationship diagram between local resistance loss and flow rate of a single right-angle elbow in a specific embodiment

[0045] Figure 4 Relationship diagram between local resistance loss and flow rate of a single variable diameter in a specific embodiment

[0046] Among them: 1. Frequency converter, 2. Submersible pump, 3. Power supply cable, 4. Infusion main pipeline, 5. Electromagnetic flowmeter, 6. First measuring branch pipeline, 7. Second measuring branch pipeline, 8. Third measuring branch pipeline, 9. First three-way valve, 10. Second three-way valve, 11. Water tank, Figure 2-Figure 4 In the figure, the horizontal axis represents the flow rate and the vertical axis represents the resistance loss along the way. DETAILED DESCRIPTION

[0047] The following is combined with Figure 1 The present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

[0048] As attached Figure 1 A device for measuring pipeline loss in an in-situ leaching uranium extraction well comprises a flow regulating module, a liquid delivery main pipeline 4, a measuring branch pipeline, and a three-way valve; the flow regulating module is connected to the liquid delivery main pipeline 4, and the measuring branch pipeline is connected to the liquid delivery main pipeline 4 through a three-way valve; there are three measuring branch pipelines, including a first measuring branch pipeline 6, a second measuring branch pipeline 7, and a third measuring branch pipeline 8; the three-way valve comprises a first three-way valve 9 and a second three-way valve 10.

[0049] The flow regulating module includes a frequency converter 1 , a submersible pump 2 and a water tank 11 . The frequency converter 1 is connected to the submersible pump 2 via a power supply cable 3 , and the submersible pump 2 is placed in the water tank 11 .

[0050] The main infusion pipeline 4 is connected to the submersible pump 2 , and an electromagnetic flowmeter 5 is arranged on the main infusion pipeline 4 .

[0051] One end of the first three-way valve 9 is connected to the infusion main pipeline 4, and the other end is connected to the third measurement branch pipeline 8; one end of the second three-way valve 10 is connected to the first measurement branch pipeline 6, and the other end is connected to the second measurement branch pipeline 7, and the two three-way valves are connected by pipelines.

[0052] The first measuring branch pipeline 6 is provided with a straight pipeline of length L, and a pressure sensor is provided at each end of the first measuring branch pipeline 6; L should be greater than 100m, between 200m-300m, to reduce the measurement error of 100-meter pipe loss.

[0053] The second measuring branch pipeline 7 is provided with N right-angle elbows, and the pipeline connecting the elbows is relatively short, 1 to 3 m. A pressure sensor is respectively provided at both ends of the second measuring branch pipeline 7, and N is 8.

[0054] N reducers are arranged on the third measuring branch pipeline 8, and a pressure sensor is arranged at each end of the third measuring branch pipeline 8, N is 3, and the reducer inner diameter is of two models, which is set here to the commonly used specifications of in-situ leaching uranium mines in my country, φ63mm*9mm (inner diameter 45mm) to φ40mm*5mm (inner diameter 30mm), each section is 1 to 3m, and the number of reducer connections in other embodiments can be increased as needed to reduce errors.

[0055] A method for calculating pipeline loss in an in-situ leaching uranium extraction well comprises the following steps:

[0056] Step 1: Measure the resistance loss along the first measuring branch pipeline 6 at different flow rates, adjust the three-way valve to ensure that the first measuring branch pipeline 6 is flowing and the other two measuring branch pipelines are closed; start the submersible pump 2, adjust the frequency converter 1 and simultaneously observe the electromagnetic flowmeter 5, according to 1m 3 / hEqual spacing from 1m 3 / h gradually increased to 10m 3 / h, each flow rate is stable for about 5 minutes, and the readings P of the pressure sensors at both ends of the first measuring branch pipe 6 are recorded simultaneously i1 , P i2 .

[0057] Step 2: According to the known parameters of the first measuring branch pipeline 6, the resistance loss per 100 meters along the first measuring branch pipeline 6 at different flow rates is calculated.

[0058] Step 3: Measure the local resistance loss of the second measuring branch pipeline 7 at different flow rates, adjust the three-way valve to ensure that the second measuring branch pipeline 7 is flowing and the other two measuring branch pipelines are closed; 3 / hEqual spacing from 1m 3 / h gradually increased to 10m 3 / h, each flow rate is stable for about 5 minutes, and the readings of the pressure sensors at both ends of the second measuring branch pipe 7 are recorded synchronously, P i3 , P i4 , the pressure difference between the two ends, △Pi=P i3 -P i4 , MPa.

[0059] Step 4: Based on the known parameters of the second measuring branch pipeline 7, calculate the local resistance loss of a single elbow of the second measuring branch pipeline 7 at different flow rates.

[0060] Step 5: Measure the local resistance loss of the third measuring branch pipeline 8 at different flow rates, adjust the three-way valve to ensure that the third measuring branch pipeline 8 is flowing and the other two measuring branch pipelines are closed; 3 / hEqual spacing from 1m 3 / h gradually increased to 10m 3 / h, each flow rate is stable for about 5 minutes, and the readings P of the pressure sensors at both ends of the third measuring branch pipeline 8 are recorded simultaneously i5 , P i6 , the pressure difference between the two ends, △Pi=P i5 -P i6 , MPa.

[0061] Step 6: According to the known parameters of the third measuring branch pipeline 8, calculate the local resistance loss of a single variable diameter of the third measuring branch pipeline 8 at different flow rates.

[0062] Step 7: Plot the relationship between the resistance loss calculated in steps 2, 4, and 6 and the corresponding flow rate, and fit them using polynomials, power equations, etc. to obtain the corresponding formula.

[0063] Step 8: According to the actual calculation requirements, substitute the corresponding flow value into the formula obtained in step 7 to obtain the resistance loss value.

[0064] The method for calculating the resistance loss along the first measuring branch pipeline 6 at different flow rates in step 2 is as follows:

[0065] Flow rate Q flowing through the first measuring branch pipe 6 i , m 3 / h; inner diameter of the infusion tube D, m; length L of the first measuring branch line 6, pressure difference at both ends, △Pi, MPa;

[0066] Each corresponding Qi The flow rate in the infusion tube is v i , m / s;

[0067]

[0068] ΔP i =P i1 -P i2 (2)

[0069] According to the hydraulic theory formula: ΔP=h f ·ρg, the resistance loss along the infusion pipe at each corresponding Qi (Formula 3):

[0070]

[0071] The resistance loss of the infusion tube along the 100-meter route is:

[0072]

[0073] When the in-situ leaching uranium extraction well is in production, the pipeline system will not be equipped with a pressure gauge, but each pipeline is equipped with an electromagnetic flow meter. Therefore, through the device of the present invention and the above-mentioned experiment, the resistance coefficient along the first measuring branch pipeline (6) can be obtained:

[0074]

[0075] The method for calculating the resistance loss along the second measuring branch pipeline 7 at different flow rates in step 4 is as follows:

[0076] Flow rate Q flowing through the second measuring branch pipe 7 i , m 3 / h, the pressure difference at both ends of the elbow component on the second measuring branch pipeline 7 is △Pi;

[0077] The local resistance loss of the elbow in the second measuring branch pipeline 7 (Formula 6):

[0078]

[0079] The local resistance loss of a single elbow is further obtained (Formula 7), where N is the number of elbows on the second measurement branch pipeline 7;

[0080]

[0081] The method for calculating the resistance loss along the third measuring branch pipeline 8 at different flow rates in step 6 is as follows:

[0082] The flow rate Q flowing through the third measuring branch pipeline 8 is known i , m 3 / h, the pressure P at both ends of the reducing component on the third measuring branch pipeline 8i5 , P i6 The principle of calculating the local loss of the elbow is the same as that of calculating the local loss of the elbow. Formula 6 is used to calculate the local loss of the third measuring branch pipeline 8 at the corresponding flow rate, and Formula 7 is used to calculate the local loss of a single variable diameter.

[0083] The flow rate of the submersible pump 2 can meet 1-15m 3 / h water pumping demand, the submersible pump 2 is placed in a water tank 11 (capacity should be > 4m 3 ), the power supply frequency is controlled by the connected frequency converter 1, and the power supply meets the operating requirements of the submersible pump 2 (generally industrial electricity 380V); the rated working voltage of the frequency converter 1 is 380~480V, 11KW or 15KW, 50~63Hz.

[0084] The electromagnetic flowmeter 5 adopts an electromagnetic flowmeter with an accuracy better than ±1% F·S, DN50, and a flow range of 1 to 15m 3 / h mass flowmeter that can automatically collect instantaneous flow and cumulative flow data; the pressure sensor adopts a digital pressure gauge, 0.4 level, with a range of 0~0.5MPa (the accuracy of 100m pipe resistance is about 0.1m).

[0085] The pipeline involved is made of high-strength PE pipe, and the test fluid density is 1.02kg / m 3 .

[0086] In another embodiment, the other conditions mentioned above remain unchanged, and the number of right-angle elbows and reducers is changed. Six 90° right-angle elbows are arranged on the second measuring branch pipeline 7; and four reducers are arranged on the third measuring branch pipeline 8.

[0087] According to the present invention, the device is connected and measured, and the measurement data and analysis results are as follows:

[0088] (1) Measurement and calculation of resistance loss along the first measuring branch pipeline 6

[0089]

[0090]

[0091] The relationship between flow rate and pipe resistance per 100 meters is plotted and fitted using polynomials and power equations, such as Figure 2 , the relationship is as follows:

[0092] h f100 = 0.0583Q 2 + 0.3252Q - 0.6577 (8)

[0093] R 2 =0.9985

[0094] (2) Measurement and calculation of local resistance loss at right-angle elbow 7 of the second measurement branch pipeline

[0095]

[0096]

[0097] The relationship between flow rate and local resistance loss of a single right-angle elbow is plotted and fitted using a linear term, such as Figure 3 , the relationship is as follows:

[0098] h j = 0.0726Q (9)

[0099] R 2 =0.9819

[0100] (3) Measurement and calculation of local resistance loss of the third measuring branch pipe 8 with variable diameter

[0101]

[0102] The relationship between flow rate and local resistance loss of a single variable diameter is plotted as follows: Figure 4 , the relationship is as follows:

[0103] h j = 0.0004Q 2.0477 (10)

[0104] R 2 =0.9995

[0105] Another embodiment:

[0106] The specific application of the present invention is described below through this embodiment. When the inner diameter of the pipeline system and the specifications and models of the connecting components are basically the same, the length, diameter change and number of elbows of the first measuring branch pipeline 6 are known, and the resistance of the pipeline system under different flow conditions can be calculated by referring to the three empirical formulas (Formula 8 to Formula 10) given in the embodiment.

[0107] For example, a production pumping well of a uranium mine in Inner Mongolia is used as an example. The length of the lifting pipeline system (from the outlet of the submersible pump to the main pumping pipeline in the control room) is 695m, with 2 diameter changes and 4 right-angle elbows. The pumping volume is 3-10m 3 / h lifting pipeline system resistance loss.

[0108]

[0109] By adopting the device and calculation method of the present invention, the resistance loss of the in-situ uranium extraction well lifting system under any flow condition can be calculated. It can be seen from the above table that the loss of variable diameter accounts for a very small proportion of the overall pipeline loss, less than 0.5%, which can be ignored. The loss of the right-angle elbow under the condition of larger flow is still relatively obvious. Therefore, the elbows are minimized during the connection process. The resistance along the way caused by the length of the lifting pipe becomes more obvious as the flow rate increases. In the in-situ uranium production process, the mining area should be reasonably divided, the centralized control room should be reasonably arranged, and the laying length of the surface branch pipes in the submersible pump lifting system should be reduced.

Claims

1. A device for measuring pipeline loss in an in-situ leaching uranium extraction well, characterized in that: The invention comprises a flow regulating module, a liquid infusion main pipeline (4), a measuring branch pipeline and a three-way valve; the flow regulating module is connected to the liquid infusion main pipeline (4), and the measuring branch pipeline is connected to the liquid infusion main pipeline (4) via the three-way valve; there are three measuring branch pipelines, including a first measuring branch pipeline (6), a second measuring branch pipeline (7) and a third measuring branch pipeline (8); the three-way valve comprises a first three-way valve (9) and a second three-way valve (10); the first measuring branch pipeline (6) is provided with a straight pipeline with a length of L, the second measuring branch pipeline (7) is provided with N elbows, and the third measuring branch pipeline (8) is provided with N reducers.

2. The device for measuring pipeline loss in an in-situ leaching uranium extraction well according to claim 1, characterized in that: The flow regulating module comprises a frequency converter (1), a submersible pump (2) and a water tank (11); the frequency converter (1) and the submersible pump (2) are connected via a power supply cable (3); and the submersible pump (2) is placed in the water tank (11).

3. The device for measuring pipeline loss in an in-situ leaching uranium extraction well according to claim 2, characterized in that: The main infusion pipeline (4) is connected to the submersible pump (2), and an electromagnetic flowmeter (5) is arranged on the main infusion pipeline (4).

4. The device for measuring pipeline loss in an in-situ leaching uranium extraction well according to claim 3, characterized in that: One end of the first three-way valve (9) is connected to the main infusion pipeline (4), and the other end is connected to the third measurement branch pipeline (8); one end of the second three-way valve (10) is connected to the first measurement branch pipeline (6), and the other end is connected to the second measurement branch pipeline (7), and the two three-way valves are connected by a pipeline.

5. The device for measuring pipeline loss in an in-situ leaching uranium extraction well according to claim 4, characterized in that: A pressure sensor is provided at each end of the first measurement branch pipeline (6); a pressure sensor is provided at each end of the second measurement branch pipeline (7); and a pressure sensor is provided at each end of the third measurement branch pipeline (8).

6. A method for calculating pipeline loss in an in-situ leaching uranium extraction well according to claim 5, characterized in that: The following steps are involved: Step 1: Measure the resistance loss along the first measuring branch pipeline (6) at different flow rates, adjust the three-way valve to ensure that the first measuring branch pipeline (6) is flowing, and the other two measuring branch pipelines are closed; start the submersible pump (2), adjust the frequency converter (1), and record the readings P of the pressure sensors at both ends of the first measuring branch pipeline (6) at different readings of the electromagnetic flowmeter (5). i1 , P i2 . Step 2: Based on known parameters of the first measuring branch pipeline (6), calculate the resistance loss per 100 meters along the first measuring branch pipeline (6) at different flow rates. Step 3: Measure the local resistance loss of the second measuring branch pipeline (7) at different flow rates, adjust the three-way valve to ensure that the second measuring branch pipeline (7) is flowing and the other two measuring branch pipelines are closed; adjust the frequency converter (1) and record the readings of the pressure sensors at both ends of the second measuring branch pipeline (7) at different readings of the electromagnetic flowmeter (5), P i3 , P i4 , the pressure difference between the two ends, △Pi=P i3 -P i4 , MPa. Step 4: Based on known parameters of the second measuring branch pipeline (7), calculate the local resistance loss of a single elbow of the second measuring branch pipeline (7) at different flow rates. Step 5: Measure the local resistance loss of the third measuring branch pipeline (8) at different flow rates, adjust the three-way valve to ensure that the third measuring branch pipeline (8) is flowing and the other two measuring branch pipelines are closed; adjust the frequency converter (1) and record the readings P of the pressure sensors at both ends of the third measuring branch pipeline (8) at different readings of the electromagnetic flowmeter (5). i5 , P i6 , the pressure difference between the two ends, △Pi=P i5 -P i6 , MPa. Step six: based on known parameters of the third measuring branch pipeline (8), calculate the local resistance loss of a single variable diameter of the third measuring branch pipeline (8) at different flow rates. Step 7: Plot the relationship between the resistance loss calculated in steps 2, 4, and 6 and the corresponding flow rate, and use polynomial and power equation methods to fit and obtain the corresponding formula. Step 8: According to the actual calculation requirements, substitute the corresponding flow value into the formula obtained in step 7 to obtain the resistance loss value.

7. A method for calculating pipeline loss in an in-situ leaching uranium extraction well according to claim 6, characterized in that: The method for calculating the resistance loss along the first measuring branch pipeline (6) at different flow rates in step 2 is: Flow rate Q flowing through the first measuring branch pipeline (6) i , m 3 / h; inner diameter of the infusion tube D, m; length L of the first measuring branch pipeline (6), pressure difference at both ends, △Pi, MPa; Each corresponding Q i The flow rate in the infusion tube is v i , m / s; ΔP i =P i1 -P i2 (2) According to the hydraulic theory formula: ΔP=h f ·ρg, each corresponding to Q i The resistance loss along the infusion tube is (Formula 3): The resistance loss of the infusion tube along the 100-meter route is: The resistance coefficient along the first measuring branch pipeline (6) is:

8. A method for calculating pipeline loss in an in-situ leaching uranium extraction well according to claim 6, characterized in that: The method for calculating the resistance loss along the second measuring branch pipeline (7) at different flow rates in step 4 is as follows: The flow rate Q flowing through the second measuring branch pipeline (7) i , m 3 / h, the pressure difference between the two ends of the elbow component on the second measuring branch pipeline (7) is △Pi; The local resistance loss of the elbow in the second measuring branch pipeline (7) is (Formula 6): The local resistance loss of a single elbow is further obtained (Formula 7), where N is the number of elbows on the second measurement branch pipeline (7); 9. A method for calculating pipeline loss in an in-situ leaching uranium extraction well according to claim 6, characterized in that: The method for calculating the resistance loss along the third measuring branch pipeline (8) at different flow rates in step 6 is: The flow rate Q flowing through the third measuring branch pipeline (8) is known i , m 3 / h, the pressure P at both ends of the reducing component on the third measuring branch pipeline (8) i5 , P i6 The principle of calculating the local loss of the elbow is the same as that of calculating the local loss of the elbow. The local loss of the third measuring branch pipeline (8) at the corresponding flow rate is calculated using Formula 6, and the local loss of a single variable diameter is calculated using Formula 7.

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