CN104964809A - Apparatus used for measuring filling slurry pipeline resistance loss parameter and method thereof - Google Patents

Abstract

A device and method for measuring resistance loss parameters of a filling slurry pipeline, the device includes an L-shaped pipe, a stirring device, a speed-regulating booster pump, an electromagnetic flowmeter, a mobile support, a delivery hose, a stirring device and a speed-regulating The booster pump is installed and fixed on the mobile support, and the stirring device is located under the end of the horizontal section of the L-shaped tube. The horizontal section of the L-shaped tube is composed of several short connections. There is a feeding hopper on the top of the vertical section, and a limit line is set on the feeding hopper. One end of the speed-regulating pressurized pump is connected to the stirring device, and the other end is connected to the feeding hopper through a conveying hose. The electromagnetic flowmeter is installed on the conveying soft On the pipe, the present invention also includes a method for measuring the resistance loss parameter of the filling slurry pipeline. The invention has high measurement accuracy, simple calculation, small occupied area, short test period, low test cost and less materials used.

Description

A device and method for measuring resistance loss parameters of filling slurry pipelines

technical field

The invention relates to a method and special equipment for measuring resistance loss parameters, in particular to a device and method for measuring resistance loss parameters of filling slurry pipelines.

Background technique

With the prominence of resource utilization and environmental protection issues, the requirements for mine solid waste discharge, surface protection, resource recovery rate, etc. are increasing day by day. As the most important technical means to solve the above problems, mine filling has been widely used in the field of mines at home and abroad. . The main requirements for mine filling include: (1) A low-cost, high-quality filling body is formed after filling; (2) The filling does not cause pollution to the underground environment; (3) Reduce the dehydration amount of underground filling. The above requirements mean that it is necessary to increase the concentration of the filling slurry as much as possible when filling mines, but the following problem is that with the increase of the slurry concentration, the pipeline transportation resistance is bound to be large, and the measurement of different concentrations, different material mix ratios, and different flow velocities The pipeline resistance loss parameter of filling slurry is of great significance to the design of filling slurry transportation process and equipment selection.

In the prior art, there are mainly two methods for measuring the resistance loss parameters of the filling slurry pipeline: one is to use the ring pipe simulation test to measure the pipeline resistance loss of the slurry. Experimental system, the utility model connects the material pool, stirring device, test pipeline and delivery pipeline into a circulation loop. Although it can complete the test of slurry performance parameters, the loop pipe simulation test requires the establishment of a large-scale test system, and also requires The installation of delivery pumps and a large number of test equipment also needs to occupy a large test site and consume a large amount of test materials, and the test period is long and the test cost is high; the other is to measure the rheological properties of the slurry, and then through the structure Theoretical calculation of the fluid model to determine the pipeline resistance loss under different working conditions, such as a filling mine pipeline transportation test method and special equipment announced by CN102507138A and a method for testing the fluid rheological parameters of the full tailings structure published by CN101776514A method and device, wherein CN102507138A published method and equipment theoretical calculation is relatively cumbersome, and the slurry concentration also needs to be "65%-74%", the scope of application is narrow, the method and device published by CN101776514A through the determination of the whole tailings slurry The average flow velocity of the full tailings slurry under two different angles of the delivery pipe is used to calculate the rheological parameters of the full tailings structure fluid. The calculation complexity is high and the accuracy is low, and the length of the delivery pipe is 2500 ~4000mm, it takes up a lot of space, and requires more volume of slurry and more materials.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a device and method for measuring the resistance loss parameters of the filling slurry pipeline, which has high measurement accuracy, simple calculation, small floor space and short test period , Low test cost, less materials used.

The technical solution of the present invention is: a device for measuring the resistance loss parameters of the filling slurry pipeline, including an L-shaped pipe, a stirring device, a speed-regulating pressurized pump, an electromagnetic flowmeter, a mobile support, the stirring device and the regulating device. The fast booster pump is installed and fixed on the mobile support, and the stirring device is located below the end of the horizontal section of the L-shaped tube. The horizontal section of the L-shaped tube is composed of several short connections. The top of the vertical section of the pipe is provided with a feed hopper, and a limit line is provided on the feed hopper. One end of the speed-regulating pressurized pump communicates with the stirring device, and the other end communicates with the feed hopper through a delivery hose. The electromagnetic flowmeter is installed on the delivery hose.

A further technical solution of the present invention is: the stirring device is provided with a collecting hopper, one side and the bottom of the collecting hopper are provided with openings, the opening on the side is connected to the L-shaped pipe, and the opening on the bottom is connected to the stirring device.

Further, the upper part of the feed hopper is a cylindrical structure, the lower part is a conical structure, and the limit line is located in the upper structure of the feed hopper.

Further, the sectional area of the feed hopper at the limit line is greater than 10 times the sectional area of the vertical section of the L-shaped pipe.

Further, the length of the short is 50-500 mm, the inner wall of the short is smooth, one end of the short is provided with an internal thread, and the other end is provided with an external thread.

Further, the speed-regulating booster pump is one of a slurry pump with a frequency converter, a metering pump, and a diaphragm pump.

Further, the method for determining the resistance loss parameters of filling slurry pipelines includes the following steps:

(1) Prepare a slurry with a certain concentration in the stirring device, measure the density of the slurry with a concentration pot as γ, and then pass a certain flow rate (measured by an electromagnetic flowmeter) through the conveying soft The pipe is transported into the feeding hopper, and then enters the L-shaped pipe, and the slurry output from the L-shaped pipe enters the stirring device again, forming a circulation loop for circulating the slurry;

(2) In the process of circulating the slurry, adjust the length L of the horizontal section by adjusting the number of horizontal sections of the L-shaped pipe, so that the height of the slurry is flush with the limit line or the distance difference between the limit line within the allowable range;

(3) Through theoretical calculation, determine the pipeline resistance loss parameters under the working conditions. The working conditions include the corresponding slurry flow rate, pipe diameter and material when the slurry flow rate is constant.

Further, the pipeline resistance loss parameter The formula for theoretical calculation is:

In the formula, γ is the density of the slurry, h is the difference between the elevation of the limit line and the center line of the horizontal section of the L-shaped pipe, g is the acceleration of gravity, which is taken as 9.8m/s ² , and L is the height of the horizontal section of the L-shaped pipe The total length, λ is the correction factor.

Further, the value range of the correction coefficient λ is 1.08˜1.2.

Further, the distance between the slurry height in the feed hopper and the limit line is not greater than 10mm.

Compared with the prior art, the present invention has the following characteristics:

(1) A kind of device and method for measuring the resistance loss parameter of the filling slurry pipeline provided by the present invention adopts the horizontal section of the L-shaped pipe formed by several short connections, which is convenient for adjusting the length of the horizontal section of the L-shaped pipe, and by changing The length of the horizontal section of the L-shaped tube is used in conjunction with the limit line, the test operation is simple, and it is suitable for filling materials of various properties;

(2) A device and method for measuring the resistance loss parameters of filling slurry pipelines provided by the present invention uses a limit line to control the height of the slurry liquid level, and does not need to use measuring tools such as a box ruler for measurement, which can effectively reduce the Measurement error, improve measurement accuracy;

(3) In the device and method for measuring the resistance loss parameters of the filling slurry pipeline provided by the present invention, since the height of the limit line is fixed, no measurement is required, and only the length L of the horizontal section of the L-shaped pipe and the length of the slurry need to be determined. The density γ can be according to the formula: Calculate the pipe resistance loss parameters , the method of data processing is simple and easy to operate;

(4) A device and method for measuring the resistance loss parameters of the filling slurry pipeline provided by the present invention uses a stirring device to be placed at the end of the horizontal section of the L-shaped pipe, and uses a speed-regulating booster pump to form a circulating conveying line as follows: : Stirring device→speed regulating pressurized pump→transport hose→feed hopper→vertical section of L-shaped pipe→horizontal section of L-shaped pipe (including short connection)→collecting hopper→stirring device, to ensure that during the test, the material There will be no segregation, agglomeration and other phenomena in the slurry, which can improve the measurement accuracy of the test;

(5) A device and method for measuring the resistance loss parameters of filling slurry pipelines provided by the present invention adopts a short connection with an internal thread at one end and an external thread at the other end, and the inner side of the short connection is a smooth structure, which can be Quickly changing the length of the horizontal section of the L-shaped pipe can ensure better sealing at the joint of the short joint, effectively reduce the energy loss at the joint, and avoid affecting the fluidity of the slurry in the short joint;

(6) The invention provides a device and method for measuring the resistance loss parameters of the filling slurry pipeline. The collecting hopper provided on the stirring device can effectively reduce the process of the slurry flowing out of the L-shaped pipe entering the stirring device The phenomenon of splashing in the air can reduce the waste of resources, save costs and protect the environment.

In a word, using the device and method for measuring the resistance loss parameters of filling slurry pipelines provided by the present invention to measure the resistance loss parameters of filling slurry pipelines is a test method with high reliability and high measurement accuracy, and is suitable for filling of various properties. The slurry, test operation and data processing method are simple, and the test device has high measurement accuracy, easy operation, simple and reliable structure.

The detailed structure of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the structural representation of measuring device of the present invention;

Fig. 2 is a schematic diagram of a stressed state during gravity transport of the present invention;

Fig. 3 is a schematic diagram of the structure of the short circuit in the present invention.

Detailed ways

As shown in the accompanying drawings: a device for measuring the resistance loss parameters of the filling slurry pipeline, including an L-shaped pipe 3, a stirring device 6, a speed-regulating booster pump 8, an electromagnetic flowmeter 10, a mobile support 7, and a stirring device 6 and the speed-regulating pressurized pump 8 are installed and fixed on the mobile support 7, and the stirring device 6 is located below the end of the horizontal section of the L-shaped pipe 3. The horizontal section of the L-shaped pipe 3 is composed of several shorts 4, which is convenient for adjusting the The length of the horizontal section of the tube 3, and by changing the length of the horizontal section of the L-shaped tube 3 to cooperate with the limit line 1, the test operation is simple, and it is suitable for filling materials of various properties; the inner diameter of the L-shaped tube 3 Similarly, the top of the vertical section of the L-shaped pipe 3 is provided with a feed hopper 2, and a limit line 1 is provided on the feed hopper 2. The limit line 1 is used to control the height of the slurry liquid level, and there is no need to use a box ruler to measure The tool is used to measure, which can effectively reduce the measurement error and improve the measurement accuracy; one end of the speed-regulating booster pump 8 is connected to the stirring device 6, and the other end is connected to the feed hopper 2 through the delivery hose 9, and the electromagnetic flowmeter 10 is installed on the delivery soft Tube 9 on.

Stirring device 6 is provided with collecting hopper 5, and one side and the bottom of collecting hopper 5 are all provided with opening, and the opening of side is communicated with L-shaped pipe 3, and the bottom opening is communicated with stirring device 6, uses collecting hopper 5 and can effectively reduce from L The splashing phenomenon that occurs when the slurry flowing out of the type tube 3 enters the stirring device 6 reduces the waste of resources, saves costs and protects the environment.

Use the stirring device 6 to be placed at the end of the horizontal section of the L-shaped pipe 3, and use the speed-regulating booster pump 8 to form a circulating conveying line: stirring device 6→speed-regulating booster pump 8→delivery hose 9→feed hopper 2→vertical section of L-shaped pipe 3→horizontal section of L-shaped pipe 3 (including short connection)→collecting hopper 5→stirring device 6, to ensure that the slurry will not segregate and agglomerate during the test, so that Can improve test measurement accuracy.

The upper part of the feed hopper 2 is a cylindrical structure, and the lower part is a conical structure, and the limit line 1 is located in the upper structure of the feed hopper 2 .

The cross-sectional area of the feed hopper at the limit line 1 is equal to the cross-sectional area of the vertical section of the L-shaped pipe 3 that is 11 times.

The length of the short-circuit 4 is 50mm, or it can be 100mm, 200mm or 500mm. The inner wall of the short-connect 4 is a smooth structure, and one end of the short-connect 4 is provided with an internal thread, and the other end is provided with an external thread, which can quickly change the L shape, 3. The length of the horizontal section can also ensure better sealing at the interface of the short-circuit 4, effectively reduce the energy loss at the joint, and avoid affecting the fluidity of the slurry in the short-circuit 4.

The speed-regulating booster pump 8 is a slurry pump with a frequency converter, which can ensure better fluidity of the slurry.

A method for determining the resistance loss parameters of filling slurry pipelines, comprising the steps of:

(1) Prepare a slurry with a certain concentration in the stirring device 6, measure the density of the slurry with a concentration pot as γ, and then press a certain flow rate (measured by an electromagnetic flowmeter) under the action of the speed-regulating booster pump 8, It is transported to the feed hopper 2 through the delivery hose 9, and then enters the L-shaped pipe 3, and the slurry output from the L-shaped pipe 3 enters the stirring device 6, forming a circulation loop for the circulation of the slurry delivery;

(2) In the process of circulating the slurry, adjust the length L of the horizontal section by adjusting the number of horizontal sections of the L-shaped pipe 3, so that the distance between the slurry height in the feed hopper 2 and the limit line 1 Not greater than 10mm;

(3) Through theoretical calculation, determine the pipeline resistance loss parameters under the working conditions. The working conditions include the slurry flow rate, pipe diameter and material corresponding to the slurry flow rate.

Pipeline Resistance Loss Parameters The theoretical calculation method and principle are as follows: the self-flowing transportation of slurry in the L-shaped pipe 3 is to use the potential energy of the slurry in the vertical pipeline to overcome the resistance of the pipeline to transport the filling slurry, and the stress state of the filling slurry when it flows is shown in Figure 2. It shows that P _g is the natural pressure head produced by the slurry’s own weight, P _L is the resistance loss along the process, and P _j is the local resistance loss. According to the law of energy conservation, the following formula can be obtained:

(1)

(2)

(3)

The local resistance loss Pj includes the loss of joints, elbows, etc., and the calculation is relatively complicated. To simplify the calculation, the local resistance loss is taken as 10% of the resistance loss along the way for calculation, that is,

Pj=0.1P _L (4)

Put formula (1), (2), (3) into formula (3), after simplification:

(5)

In the formula, is the pipeline resistance loss parameter, γ is the slurry density, h is the difference between the elevation of the limit line 1 and the centerline elevation of the horizontal section of the L-shaped pipe 3, g is the acceleration of gravity, 9.8m/s 2 is taken as 9.8m/s ² , and L is L The total length of the horizontal section of the type tube 3, the correction factor λ=1.1.

The relevant data obtained through the test can be substituted into the above formula (5), and the pipeline resistance loss parameter can be calculated , since the height of the limit line is fixed, no measurement is required, only the length L of the horizontal section of the L-shaped pipe and the density γ of the slurry need to be determined, according to the formula: Calculate the pipe resistance loss parameters , the method of data processing is simple and easy to operate.

The working principle and usage method of the present invention are: adopt stirring device 6 to carry out slurry preparation according to test design, after preparation, measure slurry density γ with concentration pot, before starting circulation conveying, the length of the horizontal section of L-shaped pipe 3 is kept at In the initial state, there are a certain number of short connections 4 to form the horizontal section of the L-shaped pipe 3, adjust the pump speed of the speed-regulating booster pump 8 according to the design requirements, turn on the speed-regulating booster pump 8, open the valve of the stirring device 6, and circulate After conveying and circulating conveying for a period of time, after the liquid level of the slurry is stable, if the liquid level of the slurry in the vertical section of the L-shaped pipe 3 does not reach the limit line 1, it means that the resistance of the horizontal section of the L-shaped pipe 3 is too small, then stop For transportation, a short connection 4 is installed at the end of the horizontal section of the L-shaped pipe 3 to extend the length of the horizontal section of the L-shaped pipe 3, and then the circular transportation is carried out. In the initial state, the slurry is circulated for a period of time. After the slurry level is stable, if the slurry level in the vertical section of the L-shaped pipe 3 exceeds the limit line 1, stop the transportation, and disassemble a short at the end of the horizontal section of the L-shaped pipe 3. Connection 4 is used to shorten the length of the horizontal section, and then carry out circular transportation. By continuously adjusting the length of the horizontal section of the L-shaped pipe 3 until the slurry level is within ±10mm of the limit line 1, measure and record the length L of the horizontal section of the L-shaped pipe 3 at this time. When adjusting the length of the horizontal section, in order to ensure that the slurry at the outlet of the horizontal section of the L-shaped tube 3 completely enters the stirring device 6, the stirring device 6 is moved through the moving support 7, and the collecting hopper 5 with one side opening prevents the slurry from splashing. out. The test measures the slurry density γ, the required length L of the horizontal section of the L-shaped pipe 3, the difference h between the elevation of the limit line 1 and the elevation of the center line of the horizontal section of the L-shaped pipe 3, and substitutes it into the above formula (5) to calculate The parameters of pipeline resistance loss under this working condition (slurry flow rate, pipe diameter, material) are obtained.

Claims (10)

1. A device for measuring the resistance loss parameter of the filling slurry pipeline, characterized in that: it comprises an L-shaped pipe, a stirring device, a speed-regulating pressurizing pump, an electromagnetic flowmeter, a mobile support, a stirring device and a speed-regulating pressurization The pump is installed and fixed on the mobile support, and the stirring device is located under the end of the horizontal section of the L-shaped tube. The horizontal section of the L-shaped tube is composed of several short connections. There is a feeding hopper at the top of the section, and a limit line is set on the feeding hopper. One end of the speed-regulating booster pump is connected to the stirring device, and the other end is connected to the feeding hopper through a delivery hose. The electromagnetic flowmeter is installed on the delivery hose. . 2. the device for measuring the resistance loss parameter of the filling slurry pipeline according to claim 1, characterized in that: the stirring device is provided with a collecting hopper, a side and the bottom of the collecting hopper are all provided with openings, and the opening on the side is connected to the The L-shaped pipe is connected, and the bottom opening is connected with the stirring device. 3. The device for measuring the resistance loss parameters of the filling slurry pipeline according to claim 1 or 2, characterized in that: the upper part of the feeding hopper is a cylindrical structure, the lower part is a conical structure, and the limit line is located at the feeding hopper in the superstructure. 4. The device for measuring resistance loss parameters of filling slurry pipelines according to claim 3, characterized in that: the cross-sectional area of the feed hopper at the limit line is greater than 10 times the cross-sectional area of the vertical section of the L-shaped pipe. 5. The device for measuring the resistance loss parameters of filling slurry pipelines according to claim 1, characterized in that: the length of the short connection is 50-500 mm, the inner wall of the short connection is a smooth structure, and one end of the short connection is provided with an inner wall. thread, and the other end is provided with external thread. 6. The device for measuring the resistance loss parameters of filling slurry pipelines according to claim 1, characterized in that: the speed-regulating booster pump is one of a slurry pump with a frequency converter, a metering pump, and a diaphragm pump . 7. A method for measuring the resistance loss parameter of the filling slurry pipeline, characterized in that: the device for measuring the resistance loss parameter of the filling slurry pipeline as described in any one of claims 1-6, comprising Follow the steps below: (1) Prepare a slurry with a certain concentration in the stirring device, measure the density of the slurry with a concentration pot as γ, and then transport it to the feed hopper through a delivery hose at a certain flow rate under the action of a speed-regulating booster pump. Then it enters the L-shaped pipe, and the slurry output from the L-shaped pipe enters the stirring device again, forming a circulation loop for circulating the slurry; (2) In the process of circulating the slurry, adjust the length L of the horizontal section by adjusting the number of horizontal sections of the L-shaped pipe, so that the height of the slurry is flush with the limit line or the distance difference between the limit line within the allowable range; (3) Through theoretical calculation, determine the pipeline resistance loss parameters under the working conditions. The working conditions include the corresponding slurry flow rate, pipe diameter and material when the slurry flow rate is constant. 8. the method for measuring filling slurry pipeline resistance loss parameter according to claim 7, its pipeline resistance loss parameter The theoretical calculation formula is: In the formula, γ is the density of the slurry, h is the difference between the elevation of the limit line and the center line of the horizontal section of the L-shaped pipe, g is the acceleration of gravity, which is taken as 9.8m/s ² , and L is the height of the horizontal section of the L-shaped pipe The total length, λ is the correction factor. 9. The method for measuring the resistance loss parameter of the filled slurry pipeline according to claim 8, characterized in that the value range of the correction coefficient λ is 1.08-1.2. 10. The method for measuring resistance loss parameters of filling slurry pipelines according to claim 7, characterized in that: the distance between the slurry height in the feed hopper and the limit line is not greater than 10 mm.