Energy dissipation test device and method for slurry conveying pipeline

Abstract

The application relates to a slurry conveying pipeline energy dissipation test device and method. The test device comprises a slurry storage tank, an energy dissipation test pipe group and a slurry conveying pump. The slurry storage tank is used for storing different slurry required by the test. The energy dissipation test pipe group comprises a test slurry feeding pipe, a ring pipe energy dissipation zone, a reduced diameter energy dissipation zone and a slurry return pipe. The ring pipe energy dissipation zone and the reduced diameter energy dissipation zone are respectively communicated with a total slurry conveying pipe through the test slurry feeding pipe. A flow meter is arranged on the test slurry feeding pipe. The ring pipe energy dissipation zone comprises ring pipes with different diameters, orifice plates, control valves and pressure gauges. The reduced diameter energy dissipation zone comprises steel pipes with different diameters which are smaller than the pump post collection pipe, control valves and pressure gauges. The application can carry out slurry conveying pipeline energy dissipation tests of different gradations, different concentrations and different materials, provide theoretical research data for large-drop long-distance slurry conveying pipelines, guide the design and research of slurry pipeline conveying engineering, and can also complete the test of energy dissipation orifice plates, valves and steel pipes in slurry conveying.

Description

TECHNICAL FIELD

[0001] The application belongs to the test device of slurry pipeline, and particularly relates to a slurry pipeline energy dissipation test device and a method for conducting energy dissipation test by using the device. BACKGROUND

[0002] The slurry long-distance pipeline transportation technology is a kind of solid-liquid two-phase flow hydraulic transportation technology which uses water as medium and utilizes pipeline transportation of solid materials, and belongs to a kind of pseudo-homogeneous flow state. It has developed into a safe, reliable, economic and environmental protection transportation mode and has been widely applied. Due to the large height difference of a section of pipeline or the specific gravity difference between slurry and water in batch transportation, the slurry pipeline forms accelerated flow. The appearance of accelerated flow is often accompanied by cavitation damage. The cavitation (also known as cavitation) phenomenon will form a serious impact and erosion on the pipe wall. If this phenomenon occurs in the pipeline without protection, it will seriously wear the pipeline and shorten the service life of the pipeline. Therefore, it is necessary to study the energy dissipation device to prevent the generation of accelerated flow.

[0003] The pipeline energy dissipation modes mainly include diameter change energy dissipation, orifice plate energy dissipation, regulating valve energy dissipation and drop energy dissipation, etc. In view of the particularity of the slurry, the commonly used energy dissipation modes of the slurry transportation pipeline include diameter change energy dissipation and orifice plate energy dissipation. The size of the orifice plate energy dissipation is affected by the slurry characteristics (slurry density, viscosity, grading), the orifice plate shape (orifice plate diameter, chamfer and thickness, etc.) and the flow characteristics (slurry average flow velocity, cross-section pressure difference, length of backflow zone and relative height of backflow zone), etc. The size of the diameter reduction energy dissipation is affected by the slurry characteristics, pipe diameter, length and inner wall roughness, etc. Due to the complexity of slurry energy dissipation and the lack of unified understanding of the energy dissipation mechanism, it is necessary to use professional devices to study the diameter change energy dissipation and orifice plate energy dissipation of the slurry transportation pipeline for the research of energy dissipation mechanism and the guidance of the energy dissipation station design of the slurry long-distance transportation pipeline engineering. SUMMARY

[0004] In order to solve the above technical problems, the application provides a slurry transportation pipeline energy dissipation test device and method. The test device can conduct slurry orifice plate and diameter reduction energy dissipation test of different grading, different concentration and different materials, and collect multiple sets of different test data through test. The multiple sets of test data collected can be used for later energy dissipation theory research and engineering design guidance.

[0005] In order to achieve the above technical purpose, the application provides a slurry transportation pipeline energy dissipation test device. The test device comprises a slurry storage system and an energy dissipation test pipe group. The slurry storage system comprises at least two slurry storage tanks for storing different slurries required for test. The slurry outlet end of the slurry storage system is communicated with the slurry inlet end of the energy dissipation test pipe group through a total slurry conveying pipe.

[0006] The energy dissipation test pipe group comprises a test slurry feeding pipe, a ring pipe energy dissipation zone, a reduced diameter energy dissipation zone and a slurry return pipe, the ring pipe energy dissipation zone and the reduced diameter energy dissipation zone are respectively communicated with the total slurry conveying pipe through the test slurry feeding pipe and communicated with the slurry feeding pipe of the slurry storage system through the slurry return pipe, a flow meter is arranged at the connection end of the test slurry feeding pipe and the total slurry conveying pipe; the ring pipe energy dissipation zone comprises a plurality of energy dissipation ring pipe groups with different pipe diameters, each energy dissipation ring pipe group comprises a horizontal pipe connected with the test slurry feeding pipe and the slurry return pipe and a plurality of vertical upward ring pipes arranged at equal intervals on the horizontal pipe, a hole plate empty holder for placing an energy dissipation orifice plate is arranged at the same position of each ring pipe group, and energy dissipation orifice plates with different orifice diameters, chamfers and thicknesses are placed in the hole plate empty holders of each ring pipe group; a second control valve is arranged at the slurry feeding port of the horizontal pipe, third pressure gauges are arranged at the slurry feeding end of the first ring pipe, between adjacent two ring pipes and the slurry discharging end of the last ring pipe, and third control valves are arranged on the horizontal pipe below each ring pipe.

[0007] Further technical solutions of the present application: the test device further comprises a flushing system, the slurry storage system comprises a first slurry storage tank, a second slurry storage tank, a first slurry conveying pump, a second slurry conveying pump and a third slurry conveying pump; the first slurry storage tank and the second slurry storage tank are internally provided with stirrers, and the slurry return pipes are respectively communicated with the first slurry storage tank and the second slurry storage tank; the flushing system comprises a water storage tank and a flushing water pump, the water storage tank is communicated with the total slurry conveying pipe through a flushing water pipe, the flushing water pump is installed on the flushing water pipe, and a first pressure gauge and a first control valve are installed at the position of the flushing water pipe located at the water outlet end of the flushing water pump;

[0008] The pump front slurry conveying pipe of the first slurry conveying pump is connected with the slurry outlet of the first slurry storage tank, the pump front slurry conveying pipe of the second slurry conveying pump is connected with the slurry outlet of the second slurry storage tank, and the pump front slurry conveying pipe of the third slurry conveying pump is respectively communicated with the second slurry storage tank and the water storage tank; the pump front slurry conveying pipes of the first slurry conveying pump and the second slurry conveying pump are respectively communicated with the flushing water pipe; the pump rear slurry conveying pipes of the first slurry conveying pump, the second slurry conveying pump and the third slurry conveying pump are respectively communicated with the total slurry conveying pipe, and a second pressure gauge is arranged on each pump rear slurry conveying pipe.

[0009] The preferred technical scheme of the present application is: the energy dissipation test device further comprises a waste slurry recovery system, the waste slurry recovery system comprises a waste slurry recovery tank and a plurality of waste slurry recovery trenches connected with the waste slurry recovery tank; a first discharge branch pipe is arranged on the slurry outlet pipe after the first slurry pump, the second slurry pump and the third slurry pump, each first discharge branch pipe is connected with the waste slurry recovery trench, and is used for discharging the mixed slurry in the slurry pump during flushing; a first discharge control valve is arranged on each first discharge branch pipe; a second discharge branch pipe connected with the waste slurry recovery trench is arranged at the slurry outlet end of each group of energy dissipation ring pipe groups; a second discharge control valve is arranged on each second discharge branch pipe; a third discharge branch pipe connected with the waste slurry recovery trench is arranged at the slurry outlet end of the diameter-reducing energy dissipation area; and a third discharge control valve is arranged on the third discharge branch pipe.

[0010] The preferred technical scheme of the present application is: the test device further comprises a slurry transfer pump for the slurry in the first slurry storage tank and the second slurry storage tank; the slurry inlet pipes before the pump of the transfer pump are respectively connected with the slurry outlets of the first slurry storage tank and the second slurry storage tank through two slurry inlet branch pipes; the slurry outlet pipes after the pump of the transfer pump are respectively connected with the slurry inlets of the first slurry storage tank and the second slurry storage tank through two slurry outlet branch pipes; a slurry inlet control valve is arranged on each slurry inlet branch pipe; a first slurry outlet control valve is arranged on each slurry outlet branch pipe; and the return slurry pipe is connected with the slurry outlet pipe after the pump of the transfer pump.

[0011] The preferred technical scheme of the present application is: the ring pipe energy dissipation area comprises three groups of energy dissipation ring pipe groups with DN400, DN300 and DN200 pipe diameters, the three groups of energy dissipation ring pipe groups are equidistantly arranged side by side, three ring pipes are equidistantly arranged on the horizontal pipe of each group of energy dissipation ring pipe groups, two orifice spacers are arranged on each ring pipe, the two orifice spacers on each ring pipe are arranged at the same position and are respectively arranged at the inlet end and the outlet end of the ring pipe; third pressure gauges are arranged before and after each ring pipe; the diameter-reducing energy dissipation area comprises energy dissipation pipes with DN200, DN150 and DN100 pipe diameters, the energy dissipation pipes are straight pipes; the ring pipe energy dissipation area and the diameter-reducing energy dissipation area share a connection test slurry inlet pipe and a return slurry pipe, a fifth control valve is arranged at the position of the connection test slurry inlet pipe between the liquid inlet end of the ring pipe energy dissipation area and the liquid inlet end of the diameter-reducing energy dissipation area, and a sixth control valve is arranged at the area of the return slurry pipe between the liquid outlet end of the ring pipe energy dissipation area and the liquid outlet end of the diameter-reducing energy dissipation area.

[0012] The preferred technical scheme of the present application is: the first slurry storage tank and the second slurry storage tank are cylindrical slurry storage tanks with the same size, are arranged through supports, have top covers arranged at the top of each slurry storage tank, have cage ladders arranged on the side surfaces, have at least two slurry outlets arranged at the bottom, have slurry inlets arranged at the top, and have second slurry outlet control valves arranged at each slurry outlet of the first slurry storage tank and the second slurry storage tank; the water storage tank is a cylindrical tank body with a cover, and also has a cage ladder arranged on the side surface.

[0013] The preferred technical scheme of the present application is as follows: the first pulp conveying pump, the second pulp conveying pump, the third pulp conveying pump, the pump front pulp pipe and the pump rear pulp pipe all adopt DN300 pulp conveying pipes, the first discharge branch pipe adopts a DN150 discharge pipe, the flushing water pipe adopts a DN200 water conveying pipe, the pump front pulp pipes of the first and second pulp conveying pumps are respectively communicated with the flushing water pipe through branch water pipes, and an electric control valve is arranged on each branch water pipe.

[0014] The hole plate emptying device in the present application is a hollow cylinder structure with a diameter larger than the pipe diameter, and can place different hole diameter ratio, chamfer and thickness energy dissipation hole plates inside.

[0015] In order to achieve the above technical purpose, the present application also provides a pulp conveying pipeline energy dissipation test method, which uses the above-mentioned pulp conveying pipeline energy dissipation test device for testing, and the test includes hole plate energy dissipation test and reduced diameter energy dissipation test.

[0016] S1: formulating a test scheme, the test scheme including at least three groups of tests of A, B, C, …; each group of tests including at least three groups of energy dissipation ring pipe groups of different pipe diameters, each group of energy dissipation ring pipe groups being provided with at least three energy dissipation ring pipes, and the at least three energy dissipation ring pipes of each group of energy dissipation ring pipe groups being numbered in the order of A1, A2, …, An, and the parameters of the energy dissipation hole plates selected for the test being set to include three parameters of hole diameter ratio, chamfer and thickness; the energy dissipation hole plates installed in the hole plate emptying devices of the A1 to An energy dissipation ring pipes of the same group of energy dissipation ring pipe groups in the same group of tests being set to have one parameter as a variable, and the other two parameters being the same; the hole plate emptying devices of the energy dissipation ring pipes with the same number in the energy dissipation ring pipe groups of different pipe diameters in the same group of tests being installed with the hole plates of the same parameters; and different variable parameters being set in different groups of tests.

[0017] S2: installing the energy dissipation hole plates meeting the parameters of the A group of tests in the hole plate emptying devices of each ring pipe of each group of energy dissipation ring pipe groups; and the outer diameters of the energy dissipation hole plates of each group of energy dissipation ring pipe groups being consistent with the pipe diameters of the test pipes.

[0018] S3: crushing the solid materials into a graded water mixture meeting the requirements of pipeline conveying, and then storing the graded water mixture in the second pulp storage tank after mixing and stirring, opening the stirrer when the pulp storage tank is fed; and checking the test equipment before the test to ensure that the test equipment meets the test requirements, all control valves being in a closed state, the A1, A2, …, An energy dissipation ring pipe groups being numbered in order, and then starting the test.

[0019] S4: open the second slurry tank out of the slurry control valve, to start the second slurry pump within 10HZ low frequency, after the pump to the second pressure gauge reading stable open pump control valve, while opening the total slurry pipe, test slurry feeding pipe, back to the slurry pipe, the second slurry tank into the slurry pipeline and each group of energy dissipation ring pipe group horizontal pipe into the slurry end and the out of the slurry end control valve;

[0020] S5: open the third control valve on the horizontal pipe below each ring of each group of energy dissipation ring pipe group, the whole system stable operation 2-5 minutes; close the third control valve on the horizontal pipe below each ring of A1 energy dissipation ring pipe group, and then stable operation 2-5 minutes, collect the ring pipe flow, the second slurry pump frequency and the ring before and after pressure of each ring of A1 energy dissipation ring pipe group in the test;

[0021] S6: after the data collection in S5, open the outlet of the water storage tank and the pre-pump control valve of the flushing water pump, close the post-pump control valve of the second slurry pump, open the first discharge control valve on the post-pump first discharge branch pipe of the second slurry pump, start the flushing water pump, and then open the post-pump control valve of the flushing water pump after the pressure is stable. The flushing water will discharge the slurry in the second slurry pump from the post-pump first discharge branch pipe of the second slurry pump. After the slurry replacement is completed, the frequency of the flushing water pump is increased for slurry pushing water operation in the energy dissipation pipe area. When the solid-liquid ratio in the whole pipeline is less than 5%, the flushing water pump stops, and all control valves are reset. The data collection of A1 energy dissipation ring pipe group test is completed;

[0022] S7: repeat steps S4-S6, respectively close the third control valve on the horizontal pipe below each ring of A2 to An energy dissipation ring pipe group, collect the ring pipe flow, the second slurry pump frequency and the ring before and after pressure of each ring of corresponding test energy dissipation ring pipe group, and clean the whole test pipeline after the data collection of each energy dissipation ring pipe group is completed. The test of group A is completed.

[0023] S8: replace the different parameters of the orifice plate, repeat S2 to S7 to perform group B, group C and the remaining groups of energy dissipation test in turn; and collect the test data of each group;

[0024] The specific steps of the diameter reduction energy dissipation test are as follows:

[0025] S1: make a test plan, crush the solid material into a graded water mixture that meets the requirements of pipeline transportation, and store it in the first slurry tank after stirring. Open the stirrer when the slurry tank is fed. Before the test, check the test equipment to ensure that it meets the test requirements, and all control valves are in the closed state. Number the multiple energy dissipation pipes in the order of B1, B2……Bn, and then start the test.

[0026] S2: open the control valve of the first slurry tank outlet, start the first slurry pump at a low frequency of 10HZ or less, and open the control valve of the first slurry pump after the pump pressure gauge reading is stable, and open the total slurry pipeline, test slurry inlet pipeline, return slurry pipeline, first slurry tank inlet pipeline and B1 energy dissipation pipe inlet and outlet control valve, and the whole system runs stably for 4-7 minutes, and the pressure, flow and first slurry pump frequency of B1 energy dissipation pipe are collected;

[0027] S3: the data collection in step S2 is completed, the control valve of the first slurry tank outlet is closed, the first slurry pump is stopped, the outlet of the water storage tank and the pre-pump control valve of the flushing water pump are opened, the post-pump control valve of the first slurry pump is closed, the first discharge control valve on the first discharge branch pipe after the first slurry pump is opened, the flushing water pump is started, the post-pump control valve of the flushing water pump is opened after the pressure is stable, the flushing water is discharged from the first slurry pump after the first slurry pump, and the flushing water pump is lifted after the slurry replacement is completed, the energy dissipation pipe area slurry water pushing operation is carried out, the flushing water pump is stopped when the solid-liquid ratio in the whole pipeline is less than 5%, all control valves are reset, and the energy dissipation test data collection of B1 energy dissipation ring pipe is completed;

[0028] S4: repeat steps S2-S3, open the control valves of B2 to Bn energy dissipation pipe inlet and outlet respectively, and collect the pressure, flow and first slurry pump frequency of B2 to Bn energy dissipation pipe respectively, and clean the test pipeline with water after the data collection of each energy dissipation pipe is completed, and complete the data collection of the reduced diameter energy dissipation test.

[0029] The further technical scheme of the present application: the total amount of slurry in the second slurry tank in the orifice plate energy dissipation test is 1.2-1.5 times the volume of all pipelines required by the orifice plate energy dissipation test; in the orifice plate energy dissipation test S3 step, check the reset position of all control valves on site, ensure that the cooling water of various pumps is added in place, confirm that there is no problem of dripping, leaking and overflowing of slurry and water in the test system, and there is no power transmission failure in the test system; in the orifice plate energy dissipation test S8 step, the collected pressure, flow and first slurry pump frequency data of A2 to An energy dissipation pipe are combined with the corresponding orifice plate parameters for later analysis of the influence law of orifice plate diameter ratio, chamfer, thickness and flow velocity, flow, pressure and noise; or in the orifice plate energy dissipation test S8 step, the collected pressure, flow and first slurry pump frequency data of A2 to An energy dissipation pipe and the diameter ratio, chamfer and thickness data of the corresponding orifice plate are fitted to obtain the calculation formula of the orifice plate energy dissipation coefficient i, and the orifice plate energy dissipation coefficient i is calculated for calculating the energy dissipation pressure drop of the orifice plate in actual engineering, and selecting a suitable orifice plate according to the calculation result; the orifice plate energy dissipation coefficient i formula is as follows:

[0030]

[0031] In the above formula: i - orifice energy dissipation coefficient, dimensionless;

[0032] β - orifice diameter ratio, dimensionless; Q - slurry flow, m 3 / h;

[0033] ΔP - energy dissipation pressure drop, MPa; r - orifice chamfer, °; t - orifice thickness, m;

[0034] x, y - fitting coefficients; through a three-element function, a plurality of experimental data fitting.

[0035] The x, y can be fitted by a three-element function, a plurality of experimental data are collected, and the formula is fitted by MATLAB. In actual engineering application, the orifice parameters to be selected and the coefficient i calculated by the above formula can be substituted into the above formula to calculate the energy dissipation pressure drop of the orifice to be selected.

[0036] The further technical scheme of the present application: the total amount of slurry in the first slurry tank in the diameter reduction energy dissipation test is 1.2-1.5 times the volume of all pipelines required for the orifice energy dissipation test; the step S2 in the diameter reduction energy dissipation test checks the homing of all control valves on site, ensures that the cooling water of various pumps is added in place, confirms that there is no problem of dripping, leaking and spouting of slurry and water in the entire test system, and there is no power transmission failure in the test system; the pressure, flow and first slurry pump frequency data of B1 to Bn energy dissipation pipes collected in step S4 are combined with the pipe length and pipe diameter of B1 to Bn energy dissipation pipes for later analysis of the influence law of energy dissipation pipe length, pipe diameter, energy dissipation pipe flow and pressure; or the pressure, flow and first slurry pump frequency data of B1 to Bn energy dissipation pipes collected in step S4 are combined with the pipe length and pipe diameter data of B1 to Bn energy dissipation pipes to establish a mathematical model, fit the calculation formula of the diameter reduction pipe energy dissipation coefficient k, and calculate the diameter reduction pipe energy dissipation coefficient k, which is used for calculating the energy dissipation pressure drop of the energy dissipation pipe in actual engineering, and selecting the energy dissipation pipe with a suitable pipe diameter according to the calculation result, and the diameter reduction pipe energy dissipation coefficient k calculation formula is as follows:

[0037]

[0038] In the formula: k - diameter reduction pipe energy dissipation coefficient, dimensionless;

[0039] Q - slurry flow, m 3 / h; ΔP - energy dissipation pressure drop, MPa;

[0040] L - diameter reduction pipe length, m; d - diameter reduction pipe inner diameter, m;

[0041] z - fitting coefficient; through a two-element function, a plurality of experimental data fitting.

[0042] The pressure gauges before and after the ring pipe in the application are used for detecting the pressure drop of the orifice plate, and each horizontal pipe at the lower part of the ring pipe is provided with a control valve; when the control valve is closed, the slurry passes through the orifice plate on the ring pipe, so as to realize the purpose of pressure reduction; when the control valve is opened, the slurry passes through the bypass, and the pressure will not be reduced. In the application, the ditch can be provided with a 1% slope, and the waste slurry passes through the discharge pipe and flows to the ditch, and all the ditches are connected to the waste slurry pool.

[0043] The application can also be prepared with a control system for automatic control, and the control system comprises a PLC controller; the first control valve, the slurry inlet control valve, the first slurry outlet control valve, the first discharge control valve, the second slurry outlet control valve, the second control valve, the third control valve, the second discharge control valve, the fourth control valve, the fifth control valve, the sixth control valve and the control valves of each branch in the application are electric control valves; the PLC controller is signal connected with each electric control valve; the PLC controller is signal connected with the flushing water pump, the first pressure gauge, the second pressure gauge, the first slurry conveying pump, the second slurry conveying pump, the third slurry conveying pump, the transmission pump, the flow meter, the third pressure gauge and the fourth pressure gauge, and can collect various data through a data acquisition module and transmit the data to the PLC controller; the opening and closing of each pump and control valve are automatically controlled by the PLC controller; and the pressure data collected by the pressure gauges can also be directly uploaded to the control system for processing and analysis.

[0044] The test device in the application can perform slurry orifice plate and diameter reduction energy dissipation tests of different gradations, different concentrations and different materials, a plurality of different data are obtained through the tests, and the influence law of the orifice plate diameter ratio, chamfer, thickness and flow and pressure of the energy dissipation orifice plate is analyzed and researched in the later period; the design and development of the energy dissipation orifice plate device can reasonably design and optimize the orifice plate parameters of the pipeline, explore the influence of different orifice parameters on the pipeline energy dissipation, facilitate the analysis of the influence law of various types of orifice plate parameters, provide a theoretical basis for the design of such energy dissipators, the energy dissipation orifice plate device can prolong the service life of the pipeline, improve the working safety of the long-distance high-fall pipeline, reduce the working environment noise, and has important significance for green and efficient production of slurry pipelines. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a structural schematic diagram in the application;

[0046] Figure 2 is an enlarged schematic diagram of a slurry storage tank region in the application;

[0047] Figure 3 is an enlarged schematic diagram of an energy dissipation test system in the application;

[0048] Figure 4 is a perspective effect diagram of the application.

[0049] In the diagram: 1—First slurry storage tank, 2—Second slurry storage tank, 3—Water storage tank, 4—Flushing water pump, 5—Flushing water pipe, 500—First pressure gauge, 501—First control valve, 6—Main slurry delivery pipe, 7—First slurry delivery pump, 8—Second slurry delivery pump, 9—Third slurry delivery pump, 10—Transfer pump, 11—Waste slurry recovery tank, 12—Inlet slurry control valve, 13—First outlet slurry control valve, 14—Waste slurry recovery ditch, 15—First discharge branch pipe, 16—First discharge control valve, 17—Second pressure gauge, 18 19—Second discharge control valve; 20—Test slurry inlet pipe; 21—Return slurry pipe; 22—Flow meter; 23—Horizontal pipe; 24—Circular pipe; 25—Orifice plate evacuator; 26—Second control valve; 27—Third pressure gauge; 28—Second discharge branch pipe; 29—Second discharge control valve; 30—Energy dissipation pipe; 31—Fourth pressure gauge; 32—Fourth control valve; 33—Third discharge branch pipe; 34—Third discharge control valve; 35—Fifth control valve; 36—Sixth control valve. Detailed Implementation

[0050] The present invention will be further described below with reference to the accompanying drawings and embodiments. Figures 1 to 4 All accompanying drawings are simplified versions of embodiments and are intended only to clearly and concisely illustrate the embodiments of the present invention. The technical solutions shown in the drawings below are specific solutions of embodiments of the present invention and are not intended to limit the scope of the claimed invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0051] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0052] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms such as "arrangement", "connection" should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] The embodiment provides a slurry conveying pipeline energy dissipation test device, as shown in Figures 1 to 3 The test device comprises a slurry storage system, a flushing system, an energy dissipation test pipe group and a waste slurry recovery system; the slurry outlet end of the slurry storage system is communicated with the slurry inlet end of the energy dissipation test pipe group through a total slurry conveying pipe 6; the slurry storage system comprises a first slurry storage tank 1, a second slurry storage tank 2, a first slurry conveying pump 7, a second slurry conveying pump 8 and a third slurry conveying pump 9; the first slurry storage tank 1 and the second slurry storage tank 2 are cylindrical slurry storage tanks with the same size, are erected through a support, are provided with a stirrer in the inside of each slurry storage tank, are provided with a top cover at the top, are provided with a cage ladder at the side, are provided with at least two slurry outlets at the bottom, and are provided with a slurry inlet at the top; a second slurry outlet control valve 18 is arranged at each slurry outlet of the first slurry storage tank 1 and the second slurry storage tank 2 respectively. The pump front slurry pipe of the first slurry conveying pump 7 is connected with the slurry outlet of the first slurry storage tank 1, the pump front slurry pipe of the second slurry conveying pump 8 is connected with the slurry outlet of the second slurry storage tank 2, and the pump front slurry pipe of the third slurry conveying pump 9 is communicated with the second slurry storage tank 2 and a water storage tank 3 respectively; the pump front slurry pipes of the first slurry conveying pump 7 and the second slurry conveying pump 8 are communicated with a flushing water pipe 5 respectively; the pump rear slurry pipes of the first slurry conveying pump 7, the second slurry conveying pump 8 and the third slurry conveying pump 9 are communicated with the total slurry conveying pipe 6 respectively, and a second pressure gauge 17 is arranged on each pump rear slurry pipe. The flushing system comprises a water storage tank 3 and a flushing water pump 4, the water storage tank 3 is a cylindrical tank body with a cover, and a cage ladder is also arranged on the side of the tank body. The water storage tank 3 is communicated with the total slurry conveying pipe 6 through a flushing water pipe 5, the flushing water pump 4 is installed on the flushing water pipe 5, and a first pressure gauge 500 and a first control valve 501 are installed at the position of the flushing water pipe 5 located at the water outlet end of the flushing water pump 4.

[0054] The embodiment provides a slurry conveying pipeline energy dissipation test device, as shown in Figure 1 and Figure 3As shown, the energy dissipation test pipe group includes a test slurry feed pipe 19, a ring pipe energy dissipation zone, a reduced diameter energy dissipation zone, and a back slurry pipe 20, the ring pipe energy dissipation zone and the reduced diameter energy dissipation zone are respectively communicated with the total slurry conveying pipe 6 through the test slurry feed pipe 19, and communicated with the slurry inlet pipe of the first slurry storage tank 1 and the second slurry storage tank 2 through the back slurry pipe 20, a flow meter 21 is arranged at the connection end of the test slurry feed pipe 19 and the total slurry conveying pipe 6; the ring pipe energy dissipation zone includes three groups of energy dissipation ring pipes with DN400, DN300, and DN200 pipe diameters, the three groups of energy dissipation ring pipes are equidistantly arranged side by side, each group of energy dissipation ring pipes includes a horizontal pipe 22 connected with the test slurry feed pipe 19 and the back slurry pipe 20, and three groups of vertically upward ring pipes 23 equidistantly arranged on the horizontal pipe 22, two orifice holders 24 are arranged on each ring pipe 23, different orifice plates with different aperture ratios, chamfers, and thicknesses are placed in each group of ring pipes 23, the two orifice holders 24 on each ring pipe 23 are arranged at the same position, and are respectively arranged at the inlet end and the outlet end of the ring pipe; a second control valve 25 is arranged at the slurry inlet of the horizontal pipe 22, a third pressure gauge 26 is arranged at the slurry inlet end of the first group of ring pipes, between the adjacent two groups of ring pipes, and at the slurry outlet end of the last group of ring pipes, and a third pressure gauge 26 is arranged before and after each ring pipe 23; a third control valve 27 is arranged on the horizontal pipe 22 below each group of ring pipes 23. The reduced diameter energy dissipation zone includes three energy dissipation pipes 30 with different diameters smaller than the total slurry conveying pipe 6 and the test slurry feed pipe 19, the total slurry conveying pipe 6 and the test slurry feed pipe 19 are both DN300 pipes, the ring pipe energy dissipation zone and the reduced diameter energy dissipation zone are provided with DN200, DN150, and DN100 energy dissipation pipes 30, the three energy dissipation pipes 30 are arranged side by side, the two ends of each energy dissipation pipe 30 are respectively communicated with the test slurry feed pipe 19 and the back slurry pipe 20, a fourth control valve 32 is arranged at the slurry inlet and the slurry outlet of each energy dissipation pipe 30, the energy dissipation pipe 30 is preferably a straight pipe, and a bent pipe is used in the embodiment to save space, in order to test accurately, a fourth pressure gauge 31 is arranged at the slurry inlet end and the slurry outlet end of the straight pipe part of each energy dissipation pipe, and four groups of fourth pressure gauges 31 are arranged in the embodiment. The ring pipe energy dissipation zone and the reduced diameter energy dissipation zone share one pipe connected with the test slurry feed pipe 19 and the back slurry pipe 20, a fifth control valve 35 is arranged at the position of the test slurry feed pipe 19 between the liquid inlet end of the ring pipe energy dissipation zone and the liquid inlet end of the reduced diameter energy dissipation zone, and a sixth control valve 36 is arranged at the area of the back slurry pipe 20 between the liquid outlet end of the ring pipe energy dissipation zone and the liquid outlet end of the reduced diameter energy dissipation zone.

[0055] The embodiment provides a slurry conveying pipeline energy dissipation test device, which comprises a first slurry storage tank, a second slurry storage tank, a total slurry conveying pipe, a test slurry feed pipe, a back slurry pipe, a ring pipe energy dissipation zone, a reduced diameter energy dissipation zone, and a control valve. Figures 1 to 3As shown, the waste pulp recovery system includes a waste pulp recovery tank 11 and a plurality of waste pulp recovery trenches 14 connected to the waste pulp recovery tank 11; the pump-out pulp pipes after the first pulp conveying pump 7, the second pulp conveying pump 8 and the third pulp conveying pump 9 are provided with first discharge branch pipes 15, each of the first discharge branch pipes 15 is connected to the waste pulp recovery trench 14, and is used to discharge the mixed pulp in the pulp conveying pump during flushing, and each of the first discharge branch pipes 15 is provided with a first discharge control valve 16; the horizontal pipe 22 of each group of energy dissipation ring pipe groups is provided with a second discharge branch pipe 28 connected to the waste pulp recovery trench 14, and each of the second discharge branch pipes 28 is provided with a second discharge control valve 29; the discharge end of the reduced diameter energy dissipation zone is provided with a third discharge branch pipe 33 connected to the waste pulp recovery trench 14, and the third discharge branch pipe 33 is provided with a third discharge control valve 34.

[0056] The embodiment provides a pulp conveying pipeline energy dissipation test device, as shown in the drawings, Figures 1 to 3 As shown, the test device further includes a pulp transfer pump 10 for the first pulp storage tank 1 and the second pulp storage tank 2, the pump-in pulp pipes of the transfer pump 10 are respectively connected to the pulp outlets of the first pulp storage tank 1 and the second pulp storage tank 2 through two pulp inlet branch pipes, the pump-out pulp pipes of the transfer pump 10 are respectively connected to the pulp inlets of the first pulp storage tank 1 and the second pulp storage tank 2 through two pulp outlet branch pipes, and the two pulp inlet branch pipes are respectively provided with pulp inlet control valves 12, and the two pulp outlet branch pipes are respectively provided with first pulp outlet control valves 13; the pulp return pipe 20 is connected to the pump-out pulp pipe of the transfer pump 10. The pump-in pulp pipes and the pump-out pulp pipes of the first pulp conveying pump 7, the second pulp conveying pump 8, the third pulp conveying pump 9 and the transfer pump 10 all adopt DN300 pulp conveying pipes, and the first discharge branch pipes 15 adopt DN150 discharge pipes; the flushing water pipe 5 adopts a DN200 water conveying pipe; the pump-in pulp pipes of the first pulp conveying pump 7 and the second pulp conveying pump 8 are respectively connected to the flushing water pipe 5 through branch water pipes, and each of the branch water pipes is also provided with an electric control valve.

[0057] The embodiment 1 provides a pulp conveying pipeline energy dissipation test method, which uses the above-mentioned pulp conveying pipeline energy dissipation test device to perform orifice plate energy dissipation test, and specifically includes the following steps:

[0058] S1: Formulate a test scheme, the test scheme includes three groups of tests of A, B and C; each group of test includes three kinds of pipe diameters of DN400 (coarse), DN300 (medium) and DN200 (fine) of the energy dissipation ring pipe group, three ring pipes are arranged on each group of energy dissipation ring pipe groups, and the three ring pipes on each group of energy dissipation ring pipe groups are numbered in the order of A1, A2 and A3, and the selected energy dissipation orifice plate parameters include three parameters of hole diameter ratio, chamfer and thickness;

[0059] Group A test: the orifice plate installed in the orifice plate emptying device of the three energy dissipation rings of the coarse pipe has different orifice plate diameter ratios, but the same chamfer and thickness; the orifice plate installed in the orifice plate emptying device of each energy dissipation ring of the medium pipe and the fine pipe has the same parameters as the orifice plate installed on the energy dissipation ring with the same number in the coarse pipe, except that the orifice plate diameter matches the pipe diameter;

[0060] Group B test: the orifice plate installed in the orifice plate emptying device of the three energy dissipation rings of the coarse pipe has different chamfers, but the same orifice plate diameter ratio and thickness; the orifice plate installed in the orifice plate emptying device of each energy dissipation ring of the medium pipe and the fine pipe has the same parameters as the orifice plate installed on the energy dissipation ring with the same number in the coarse pipe, except that the orifice plate diameter matches the pipe diameter;

[0061] Group C test: the orifice plate installed in the orifice plate emptying device of the three energy dissipation rings of the coarse pipe has different thicknesses, but the same orifice plate diameter ratio and chamfer; the orifice plate installed in the orifice plate emptying device of each energy dissipation ring of the medium pipe and the fine pipe has the same parameters as the orifice plate installed on the energy dissipation ring with the same number in the coarse pipe, except that the orifice plate diameter matches the pipe diameter;

[0062] S2: install the orifice plate meeting the parameters of the group A test in the orifice plate emptying device of each group of energy dissipation rings; the outer diameter of the orifice plate on each group of energy dissipation rings is consistent with the test pipe of the group;

[0063] S3: crush the solid materials into a graded water mixture that meets the requirements of pipeline transportation, mix and stir, and store in the second slurry storage tank 2; open the stirrer when the slurry storage tank is fed; the total amount of slurry in the second slurry storage tank 2 in the orifice plate energy dissipation test is 1.2 times the volume of all the pipelines required for the orifice plate energy dissipation test, to ensure that the amount of slurry meets the test requirements during the test; check the test equipment before the test, check the homing of all control valves on site, ensure that the cooling water of all types of pumps is added in place, confirm that there is no dripping, leaking, and gushing of slurry and water in the entire test system, and that there is no power transmission failure in the test system, to ensure that the test equipment meets the test requirements, all control valves are in the closed state, each group of energy dissipation rings is numbered in the order of A1, A2, and A3, and then the test begins;

[0064] S4: open the slurry outlet control valve of the second slurry storage tank 2, start the second slurry pump 8 at a low frequency of 10 HZ or less, open the post-pump control valve after the post-pump pressure gauge reading is stable, and at the same time, open the total slurry conveying pipe 6, the test slurry inlet pipe 19, the slurry return pipe 20, the second slurry storage tank 2 inlet pipe, and the control valves of the slurry inlet and outlet ends of each group of energy dissipation ring groups;

[0065] S5: open the third control valve 27 on the horizontal pipe 22 below each ring pipe 23 of each group of energy dissipation ring pipe group, and the whole system is stably operated for 2-5 minutes; close the third control valve 27 on the horizontal pipe 22 below each ring pipe 23 of the A1 energy dissipation ring pipe group, and then stably operate for 2-5 minutes, and collect the ring pipe flow, the second slurry pump frequency, and the pre-ring pressure and post-ring pressure of each ring pipe of the A1 energy dissipation ring pipe group;

[0066] S6: after the data collection in step S5 is completed, open the outlet of the water storage tank 3 and the pre-pump control valve of the flushing water pump 4, close the post-pump control valve of the second slurry pump 8, open the first discharge control valve 16 on the post-pump first discharge branch pipe 15 of the second slurry pump 8, start the flushing water pump 4, open the post-pump control valve of the flushing water pump 4 after the pressure is stable, the flushing water is discharged from the post-pump first discharge branch pipe 15 of the second slurry pump 8, after the slurry replacement is completed, the frequency of the flushing water pump 4 is increased, the slurry pushing water operation in the energy dissipation pipe area is performed, when the solid-liquid ratio in the whole pipeline is lower than 5%, the flushing water pump 4 is stopped, all the control valves are reset, and the energy dissipation test data collection of the A1 energy dissipation ring pipe group is completed;

[0067] S7: repeat steps S4-S6, respectively close the third control valve 27 on the horizontal pipe 22 below each ring pipe 23 of the A2 and A3 energy dissipation ring pipe groups, collect the ring pipe flow, the second slurry pump frequency, and the pre-ring pressure and post-ring pressure of each ring pipe of the corresponding test energy dissipation ring pipe group during the test, and clean the whole test pipeline after the data collection of each group of energy dissipation ring pipe group is completed, and complete the test of the first group;

[0068] S8: replace the energy dissipation orifice plate meeting the test parameters of the second group and the third group, repeat S2 to S7 to perform the second group and the third group tests in turn, and collect the test data of the second group and the third group; the pressure, flow and first slurry pump frequency data of the three groups of energy dissipation ring pipe groups are combined with the corresponding orifice plate parameters for later analysis of the influence law of the orifice plate hole diameter ratio, chamfer and thickness on the flow rate, flow, pressure and noise; or in the orifice plate energy dissipation test S8, the collected pressure, flow and first slurry pump frequency data of the three groups of energy dissipation ring pipe groups and the corresponding orifice plate hole diameter ratio, chamfer and thickness data are fitted to obtain a calculation formula of the orifice plate energy dissipation coefficient i, and the orifice plate energy dissipation coefficient i is calculated for calculating the orifice plate energy dissipation pressure drop in actual engineering, and a suitable orifice plate is selected according to the calculation result; the orifice plate energy dissipation coefficient i formula is as follows:

[0069]

[0070] In the above formula, i is the orifice plate energy dissipation coefficient, dimensionless;

[0071] β is the orifice plate hole diameter ratio, dimensionless; Q is the slurry flow, m 3 / h;

[0072] AP - energy dissipation pressure drop, MPa; r - orifice plate chamfer, °; t - orifice plate thickness, m;

[0073] x, y - fitting coefficients; through the three function, a plurality of experimental data fitting out, fitting method can be used in the existing conventional method for fitting.

[0074] The influence law of orifice plate diameter ratio, chamfer, thickness and flow velocity, flow, pressure, noise can be analyzed by collecting experimental data in Example 1, which can be analyzed by using existing analysis method, and the analysis method does not belong to the protection content of the present application; in the fitting calculation of orifice plate energy dissipation coefficient i in Example 1, the constants x and y can be obtained by fitting through the three function, and the fitting method can also directly use the existing method, collect a plurality of experimental data, and fit out through MATLAB and self-defined formula. In actual engineering application, the orifice plate parameters to be selected and the coefficient i calculated by the above formula can be substituted into the above formula to calculate the energy dissipation pressure drop of the orifice plate to be selected.

[0075] Example 2 provides a kind of slurry conveying pipeline energy dissipation test method, using the above slurry conveying pipeline energy dissipation test device carries out the energy dissipation test of diameter reduction, specifically comprising the following steps:

[0076] S1: formulating test scheme, crushing solid material into graded water mixing stirring to meet the requirements of pipeline transportation, and storing in the first slurry tank 1; the total amount of slurry in the first slurry tank 1 in the diameter reduction energy dissipation test is 1.2-1.5 times the volume of all pipelines required for orifice plate energy dissipation test; the stirrer is started when the slurry tank is fed; and before the test, check the test equipment, check the homing of all control valves on site, ensure that the cooling water of all kinds of pumps is added in place, confirm that there is no problem of dripping, leaking and spouting of slurry and water in the test system, and there is no fault in power transmission in the test system; ensure that the test equipment meets the test requirements, and all control valves are in closed state; then, the three energy dissipation pipes 30 are numbered in the order of B1, B2 and B3, and then the test is started;

[0077] S2: open the control valve of the slurry outlet of the first slurry tank 1, start the first slurry pump 7 at a low frequency of 10HZ or less, and when the first slurry pump 7 is pumped, the pressure gauge reading is stable, open the control valve after the first slurry pump 7, open the total slurry conveying pipe 6, test slurry inlet pipe 19, return slurry pipe 20, slurry inlet pipe of first slurry tank 1 and control valve of B1 energy dissipation pipe slurry inlet end and slurry outlet end, the whole system runs stably for 4-7 minutes, and the pressure, flow and first slurry pump frequency of B1 energy dissipation pipe are collected;

[0078] S3: After the data collection in step S2, the control valve of the outlet of the first slurry tank 1 is closed, the first slurry pump 7 is stopped, the outlet of the water storage tank 3 and the pre-pump control valve of the flushing water pump 4 are opened, the post-pump control valve of the first slurry pump 7 is closed, the first discharge control valve 16 on the post-pump first discharge branch pipe 15 of the first slurry pump 7 is opened, the flushing water pump 4 is started, the post-pump control valve of the flushing water pump 4 is opened after the pressure is stable, the flushing water in the first slurry pump 7 is discharged from the post-pump first discharge branch pipe 15 of the first slurry pump 7, the frequency of the flushing water pump 4 is increased after the slurry replacement is completed, the energy dissipation pipe area is pushed by water, and when the solid-liquid ratio in the entire pipeline is less than 5%, the flushing water pump 4 is stopped, all the control valves are reset, and the data collection of the B1 energy dissipation ring pipe is completed;

[0079] S4: Steps S2-S3 are repeated, the control valves of the inlet and outlet of the B2 and B3 energy dissipation pipes are opened respectively, the pressure, flow rate and frequency of the first slurry pump of the B2 and B3 energy dissipation pipes are collected respectively, and the entire test pipeline is washed by water after the data collection of each energy dissipation pipe is completed, and the data collection of the reduced-diameter energy dissipation test is completed.

[0080] The collected pressure, flow rate and frequency data of the first slurry pump of the three groups of energy dissipation pipes are combined with the pipe length and pipe diameter of the three groups of energy dissipation pipes for later analysis of the influence law of the energy dissipation pipe length, pipe diameter, flow rate and pressure of the energy dissipation pipe; or the collected pressure, flow rate and frequency data of the three groups of energy dissipation pipes are combined with the pipe length and pipe diameter data of the three groups of energy dissipation pipes in step S4 to establish a mathematical model, fit a calculation formula of the reduced-diameter pipe energy dissipation coefficient k, and calculate the reduced-diameter pipe energy dissipation coefficient k, which is used for calculating the energy dissipation pressure drop of the energy dissipation pipe in actual engineering, and selecting an appropriate pipe diameter of the energy dissipation pipe according to the calculation result, and the calculation formula of the reduced-diameter pipe energy dissipation coefficient k is as follows:

[0081]

[0082] In the formula: k is the reduced-diameter pipe energy dissipation coefficient, which is dimensionless;

[0083] Q is the flow rate of the slurry, m 3 / h; ΔP is the energy dissipation pressure drop, MPa;

[0084] L is the length of the reduced-diameter pipe, m; d is the inner diameter of the reduced-diameter pipe, m;

[0085] z is a fitting coefficient, which is fitted out by collecting multiple sets of experimental data through a binary function.

[0086] The influence law of the length and diameter of the energy dissipation pipe on the flow and pressure of the energy dissipation pipe can be analyzed by using the existing analysis method, and the analysis method does not belong to the protection content of the present application; in the fitting calculation of the energy dissipation coefficient k of the reduced-diameter pipe in embodiment 2, the constant z can be obtained by fitting a binary function, and the fitting method can also directly use the existing method, that is, collecting multiple sets of experimental data, and fitting out by MATLAB and self-defined formula. In actual engineering application, the energy dissipation coefficient k of the selected reduced-diameter pipe and the coefficient i calculated by the above formula are substituted into the above formula, and the energy dissipation pressure drop of the selected orifice plate can be calculated.

[0087] The above is only two embodiments of the present application, which are described in more detail, but it cannot be understood as limiting the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A device for testing the energy dissipation of a slurry pipeline, characterized in that: The test device comprises a slurry storage system and an energy dissipation test pipe group, the slurry storage system comprises at least two slurry storage tanks for storing different slurries required for tests, and the slurry outlet end of the slurry storage system is communicated with the slurry inlet end of the energy dissipation test pipe group through a total slurry conveying pipe (6); The energy dissipation test pipe group comprises a test slurry feeding pipe (19), a ring pipe energy dissipation zone, a reduced diameter energy dissipation zone and a slurry return pipe (20), the ring pipe energy dissipation zone and the reduced diameter energy dissipation zone are respectively communicated with the total slurry conveying pipe (6) through the test slurry feeding pipe (19) and communicated with the slurry inlet pipe of the slurry storage system through the slurry return pipe (20), and a flow meter (21) is arranged at the connection end of the test slurry feeding pipe (19) and the total slurry conveying pipe (6); the ring pipe energy dissipation zone comprises a plurality of energy dissipation ring pipe groups with different pipe diameters, each energy dissipation ring pipe group comprises a horizontal pipe (22) connected with the test slurry feeding pipe (19) and the slurry return pipe (20) and a plurality of vertical upward ring pipes (23) arranged at equal intervals on the horizontal pipe (22), a hole plate empty holder (24) for placing an energy dissipation orifice plate is arranged at the same position of each ring pipe (23), and different energy dissipation orifice plates with different orifice diameter ratios, chamfers and thicknesses are placed in the hole plate empty holder (24) of each ring pipe (23); a second control valve (25) is arranged at the slurry inlet of the horizontal pipe (22), third pressure gauges (26) are arranged at the slurry inlet end of the first ring pipe, between adjacent two ring pipes and at the slurry outlet end of the last ring pipe, respectively, and a third control valve (27) is arranged on the horizontal pipe (22) below each ring pipe (23); the reduced diameter energy dissipation zone comprises a plurality of energy dissipation pipes (30) with different pipe diameters smaller than the total slurry conveying pipe (6) and the test slurry feeding pipe (19), the plurality of energy dissipation pipes (30) are arranged side by side, the two ends of each energy dissipation pipe (30) are respectively communicated with the test slurry feeding pipe (19) and the slurry return pipe (20), a fourth control valve (32) is arranged at the slurry inlet and slurry outlet of each energy dissipation pipe (30), respectively, and a fourth pressure gauge (31) is arranged at the slurry inlet and slurry outlet positions of the straight pipe region of each energy dissipation pipe (30); The test device further comprises a flushing system, the slurry storage system comprises a first slurry storage tank (1), a second slurry storage tank (2), a first slurry conveying pump (7), a second slurry conveying pump (8) and a third slurry conveying pump (9), the first slurry storage tank (1) and the second slurry storage tank (2) are internally provided with stirrers, and the slurry return pipe (20) is communicated with the first slurry storage tank (1) and the second slurry storage tank (2), respectively; the flushing system comprises a water storage tank (3) and a flushing water pump (4), the water storage tank (3) is communicated with the total slurry conveying pipe (6) through a flushing water pipe (5), the flushing water pump (4) is installed on the flushing water pipe (5), and a first pressure gauge (500) and a first control valve (501) are arranged at the position of the flushing water pipe (5) located at the water outlet end of the flushing water pump (4); The pump front pulp pipe of the first pulp delivery pump (7) is connected with the pulp outlet of the first pulp storage tank (1), the pump front pulp pipe of the second pulp delivery pump (8) is connected with the pulp outlet of the second pulp storage tank (2), and the pump front pulp pipe of the third pulp delivery pump (9) is respectively communicated with the second pulp storage tank (2) and the water storage tank (3); the pump front pulp pipes of the first pulp delivery pump (7) and the second pulp delivery pump (8) are respectively communicated with the flushing water pipe (5); the pump rear pulp pipes of the first pulp delivery pump (7), the second pulp delivery pump (8) and the third pulp delivery pump (9) are respectively communicated with the total pulp delivery pipe (6), and the second pressure gauge (17) is arranged on each pump rear pulp pipe. The energy dissipation test device further comprises a waste pulp recovery system, and the waste pulp recovery system comprises a waste pulp recovery tank (11) and a plurality of waste pulp recovery trenches (14) communicated with the waste pulp recovery tank (11).

2. A device for testing the energy dissipation of a slurry pipeline according to claim 1, characterized in that: The pump rear pulp pipes of the first pulp delivery pump (7), the second pulp delivery pump (8) and the third pulp delivery pump (9) are provided with first discharge branch pipes (15), each first discharge branch pipe (15) leads to the waste pulp recovery trench (14) and is used for discharging the mixed pulp in the corresponding pulp delivery pump during flushing, and a first discharge control valve (16) is arranged on each first discharge branch pipe (15); a second discharge branch pipe (28) leading to the waste pulp recovery trench (14) is arranged at the pulp outlet end of the horizontal pipe (22) of each energy dissipation ring pipe group, and a second discharge control valve (29) is arranged on each second discharge branch pipe (28); a third discharge branch pipe (33) leading to the waste pulp recovery trench (14) is arranged at the pulp outlet end of the reduced-diameter energy dissipation zone, and a third discharge control valve (34) is arranged on the third discharge branch pipe (33).

3. A device for testing the energy dissipation of a slurry pipeline according to claim 2, characterized in that: The test device further comprises a transmission pump (10) used for transferring the pulp in the first pulp storage tank (1) and the second pulp storage tank (2), the pump front pulp pipe of the transmission pump (10) is communicated with the pulp outlets of the first pulp storage tank (1) and the second pulp storage tank (2) through two pulp inlet branch pipes, the pump rear pulp pipe of the transmission pump (10) is communicated with the pulp inlets of the first pulp storage tank (1) and the second pulp storage tank (2) through two pulp outlet branch pipes, a pulp inlet control valve (12) is arranged on each of the two pulp inlet branch pipes, and a first pulp outlet control valve (13) is arranged on each of the two pulp outlet branch pipes; the back pulp pipe (20) is communicated with the pump rear pulp pipe of the transmission pump (10). The energy dissipation test device further comprises a waste pulp recovery system, and the waste pulp recovery system comprises a waste pulp recovery tank (11) and a plurality of waste pulp recovery trenches (14) communicated with the waste pulp recovery tank (11). The pump rear pulp pipes of the first pulp delivery pump (7), the second pulp delivery pump (8) and the third pulp delivery pump (9) are provided with first discharge branch pipes (15), each first discharge branch pipe (15) leads to the waste pulp recovery trench (14) and is used for discharging the mixed pulp in the corresponding pulp delivery pump during flushing, and a first discharge control valve (16) is arranged on each first discharge branch pipe (15); a second discharge branch pipe (28) leading to the waste pulp recovery trench (14) is arranged at the pulp outlet end of the horizontal pipe (22) of each energy dissipation ring pipe group, and a second discharge control valve (29) is arranged on each second discharge branch pipe (28); a third discharge branch pipe (33) leading to the waste pulp recovery trench (14) is arranged at the pulp outlet end of the reduced-diameter energy dissipation zone, and a third discharge control valve (34) is arranged on the third discharge branch pipe (33). The test device further comprises a transmission pump (10) used for transferring the pulp in the first pulp storage tank (1) and the second pulp storage tank (2), the pump front pulp pipe of the transmission pump (10) is communicated with the pulp outlets of the first pulp storage tank (1) and the second pulp storage tank (2) through two pulp inlet branch pipes, the pump rear pulp pipe of the transmission pump (10) is communicated with the pulp inlets of the first pulp storage tank (1) and the second pulp storage tank (2) through two pulp outlet branch pipes, a pulp inlet control valve (12) is arranged on each of the two pulp inlet branch pipes, and a first pulp outlet control valve (13) is arranged on each of the two pulp outlet branch pipes; the back pulp pipe (20) is communicated with the pump rear pulp pipe of the transmission pump (10).

4. A device for testing the energy dissipation of a slurry pipeline according to claim 1 or 2, characterized in that: The ring pipe energy dissipation zone comprises three groups of energy dissipation ring pipes with DN400, DN300 and DN200 pipe diameters, the three groups of energy dissipation ring pipe groups are equidistantly arranged side by side, three ring pipes (23) are equidistantly arranged on the horizontal pipe (22) of each group of energy dissipation ring pipe groups, two orifice plate emptying devices (24) are arranged on each ring pipe (23), the two orifice plate emptying devices (24) on each ring pipe (23) are arranged at the same position and are arranged at the inlet end and the outlet end of the ring pipe respectively; a third pressure gauge (26) is arranged before and after each ring pipe (23); the reduced-diameter energy dissipation zone is provided with energy dissipation pipes (30) with DN200, DN150 and DN100 pipe diameters, the energy dissipation pipes (30) are straight pipes; the ring pipe energy dissipation zone and the reduced-diameter energy dissipation zone share a connecting test slurry feeding pipe (19) and a slurry return pipe (20), a fifth control valve (35) is arranged at the position of the connecting test slurry feeding pipe (19) between the liquid inlet end of the ring pipe energy dissipation zone and the liquid inlet end of the reduced-diameter energy dissipation zone, and a sixth control valve (36) is arranged at the area of the slurry return pipe (20) between the liquid outlet end of the ring pipe energy dissipation zone and the liquid outlet end of the reduced-diameter energy dissipation zone.

5. A device for testing the energy dissipation of a slurry pipeline according to claim 1 or 2, characterized in that: The first slurry storage tank (1) and the second slurry storage tank (2) are cylindrical slurry storage tanks with the same size and are erected by supports, a top cover is arranged at the top of each slurry storage tank, a cage ladder is arranged on the side surface, at least two slurry outlets are arranged at the bottom, a slurry inlet is arranged at the top, and a second slurry outlet control valve (18) is arranged at each slurry outlet of the first slurry storage tank (1) and the second slurry storage tank (2); the water storage tank (3) is a cylindrical tank body with a cover, and a cage ladder is also arranged on the side surface of the tank body.

6. A device for testing the energy dissipation of a slurry pipeline according to claim 3, characterized in that: The pre-pump slurry pipes and the post-pump slurry pipes of the first slurry conveying pump (7), the second slurry conveying pump (8), the third slurry conveying pump (9) and the transmission pump (10) are all DN300 slurry conveying pipes, and the first discharge branch pipe (15) is a DN150 discharge pipe; the flushing water pipe (5) is a DN200 water conveying pipe; the pre-pump slurry pipes of the first slurry conveying pump (7) and the second slurry conveying pump (8) are communicated with the flushing water pipe (5) through branch water pipes, and an electric control valve is also arranged on each branch water pipe.

7. A method of testing the energy dissipation of a slurry pipeline, characterized by The slurry conveying pipeline energy dissipation test device is used for test, the test includes orifice plate energy dissipation test and reduced-diameter energy dissipation test; the orifice plate energy dissipation test specifically includes the following steps: S1: formulating a test scheme, the test scheme includes at least three groups of tests of A, B, C, …; each group of test includes at least three groups of energy dissipation ring pipe groups with different pipe diameters, at least three energy dissipation ring pipes are arranged on each group of energy dissipation ring pipe groups, and the at least three energy dissipation ring pipes on each group of energy dissipation ring pipe groups are numbered in the order of C1, C2, …, Cn, and the selected orifice plate energy dissipation parameters include three parameters of orifice diameter ratio, chamfer and thickness; In the same group of tests, the orifice plates installed in the orifice plate emptying device of the C1 to Cn energy dissipation orifice plates on the same group of energy dissipation orifice plate groups are set with one parameter as a variable, and the other two parameters are the same; in the same group of tests, the orifice plates installed in the orifice plate emptying device of the energy dissipation orifice plates with the same number in the energy dissipation orifice plate groups with different pipe diameters are the same; different variable parameters are set in different groups of tests; S2: install the energy dissipation orifice plates meeting the test parameters of group A in each group of orifice plate emptying devices of each group of energy dissipation orifice plate groups; the outer diameter of the energy dissipation orifice plates on each group of energy dissipation orifice plate groups is consistent with the corresponding test pipeline; S3: crush the solid materials into a graded water mixture that meets the pipeline conveying requirements, mix and stir, and then store in the second slurry storage tank; open the stirrer when the slurry storage tank is fed; and check the test equipment before the test to ensure that the test equipment meets the test requirements, and all control valves are in the closed state, and then start the test; S4: open the first slurry outlet control valve of the second slurry storage tank (2), start the second slurry pump (8) at a low frequency of 10 HZ or less, open the post-pump control valve after the reading of the post-pump pressure gauge is stable, and at the same time, open the corresponding control valves of the total slurry conveying pipe (6), the test slurry inlet pipe (19), the slurry return pipe (20), the slurry inlet pipe of the second slurry storage tank (2), and the slurry inlet end and the slurry outlet end of the horizontal pipe (22) of each group of energy dissipation orifice plate groups; S5: open the third control valve (27) of the horizontal pipe (22) below each orifice (23) of each group of energy dissipation orifice plate groups, and the entire system is stably operated for 2-5 minutes; close the third control valve (27) of the horizontal pipe (22) below each orifice (23) of the A1 energy dissipation orifice plate group, and then stably operate for 2-5 minutes, and collect the orifice flow, the second slurry pump frequency, and the pre-orifice pressure and post-orifice pressure of each orifice of the A1 energy dissipation orifice plate group during the test of the A1 energy dissipation orifice plate group; S6: after the data collection in step S5 is completed, open the outlet of the water storage tank (3) and the pre-pump control valve of the flushing water pump (4), close the post-pump control valve of the second slurry pump (8), open the first discharge control valve (16) of the post-pump first discharge branch pipe (15) of the second slurry pump (8), start the flushing water pump (4), and after the pressure is stable, open the post-pump control valve of the flushing water pump (4); the flushing water discharges the slurry in the second slurry pump (8) from the post-pump first discharge branch pipe (15) of the second slurry pump (8); after the slurry replacement is completed, the frequency of the flushing water pump (4) is increased, and the water pushing operation in the energy dissipation zone is performed; when the solid-liquid ratio in the entire pipeline is less than 5%, the flushing water pump (4) stops, and all control valves are reset, and the energy dissipation test data collection of the A1 energy dissipation orifice plate group is completed; S7: repeat steps S4-S6, respectively close the third control valve (27) of the horizontal pipe (22) below each orifice (23) of the A2 to An energy dissipation orifice plate groups, and sequentially collect the orifice flow, the second slurry pump frequency, and the pre-orifice pressure and post-orifice pressure of each orifice of the corresponding test energy dissipation orifice plate group during the test of the A2 to An energy dissipation orifice plate groups, and after the data collection of each group of energy dissipation orifice plate groups is completed, wash the entire test pipeline with water, and complete group A test; S8: replace the energy dissipation orifice plate with different test parameters respectively, repeat S2 to S7 to perform the energy dissipation test of group B, group C and the remaining groups in turn; and collect the test data of each group; The specific steps of the diameter-reducing energy dissipation test are as follows: First step: develop a test plan, crush the solid materials into a graded water mixture that meets the requirements of pipeline transportation, and store the mixture in the first slurry storage tank (1) after stirring; check the test equipment before the test to ensure that the test equipment meets the test requirements, and all control valves are in the closed state; number the multiple energy dissipation pipes (30) in the order of B1, B2, …, Bn, and then start the test; Second step: open the first slurry outlet control valve of the first slurry storage tank (1), start the first slurry pump (7) at a low frequency of 10 Hz or less, and when the first slurry pump (7) is stable, open the first slurry pump (7) control valve, and at the same time, open the total slurry pipeline (6), the test slurry inlet pipeline (19), the return slurry pipeline (20), the slurry inlet pipeline of the first slurry storage tank (1), and the corresponding control valves of the B1 energy dissipation pipe inlet and outlet, and the entire system runs stably for 4-7 minutes, and the pressure, flow rate and first slurry pump frequency of B1 energy dissipation pipe are collected; Third step: after the data collection in the second step is completed, close the control valve of the first slurry outlet of the first slurry storage tank (1), stop the first slurry pump (7), open the outlet of the water storage tank (3) and the pre-pump control valve of the flushing water pump (4), close the post-pump control valve of the first slurry pump (7), open the first discharge control valve (16) on the first discharge branch pipe (15) of the first slurry pump (7), start the flushing water pump (4), and when the pressure is stable, open the post-pump control valve of the flushing water pump (4), the flushing water will discharge the slurry in the first slurry pump (7) from the first discharge branch pipe (15) after the first slurry pump (7), and when the slurry replacement is completed, the frequency of the flushing water pump (4) is increased, the slurry pushing water operation in the diameter-reducing energy dissipation zone is performed, and when the solid-liquid ratio in the entire pipeline is less than 5%, the flushing water pump (4) is stopped, all control valves are reset, and the energy dissipation test data collection of B1 energy dissipation ring pipe is completed; Fourth step: repeat steps two to three, open the corresponding control valves of B2 to Bn energy dissipation pipe inlet and outlet respectively, and collect the pressure, flow rate and first slurry pump frequency of B2 to Bn energy dissipation pipe, and after the data collection of each energy dissipation pipe is completed, the entire test pipeline is washed with water, and the diameter-reducing energy dissipation test data collection is completed.

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