A starting method of a high-pressure pipeline pressure reducing device

Abstract

The present application relates to the field of filling mining, and discloses a starting method of high-pressure pipeline pressure reducing equipment. Fresh water is used as the starting medium of the high-pressure pipeline pressure reducing equipment, the flow accepted by the rotating disc is changed by means of the flow regulating plate and the inlet valve, and the density of the filling liquid is gradually increased by different matching of the valve opening, so that the liquid momentum of the jet is gradually increased, and the torque of the pressure reducing equipment is steadily improved. The present application has simple required equipment, low investment, can ensure the stable starting of the high-pressure pipeline pressure reducing equipment, avoid the damage of the equipment caused by the instantaneous excessive torque, prevent the coil from being broken down by the instantaneous excessive current, and improve the safety and service life of the equipment.

Description

Technical Field

[0001] This invention relates to the field of backfill mining, and more particularly to a method for starting a high-pressure pipeline pressure reducing device. Background Technology

[0002] Modern industry relies heavily on raw materials, and mining is one of the most direct ways to obtain them. After mining is completed, to prevent mine collapses that could cause environmental damage, property loss, and loss of life, the mine is often backfilled. Backfill slurry is generally a homogeneous fluid composed of ore residue, cementing materials, and water, with a density approximately twice that of water. During deep well backfilling, the greater the elevation difference in the slurry transported downwards via pipelines or other channels, the greater the pipeline pressure and the higher the slurry velocity. For example... Figure 1 The diagram shows a schematic of a high-pressure pipeline pressure reducing device. Installed in a filling pipeline, the filling slurry flows vertically downwards, passing through the upper conical tube of the housing before being ejected at high speed, driving a turntable to rotate. The turntable drives a generator, generating electricity for mine lighting. After the slurry has finished its work, it flies off the turntable, splashes onto the housing, and flows back to the downstream pipeline at a very low velocity under gravity, thus reducing pressure in the pipeline and utilizing the remaining elevation to complete the filling process, while simultaneously generating electricity for lighting. In the conventional starting method, the motor is first adjusted to its rated speed, then the slurry is directly filled. The turntable receives the high-speed impact of the slurry. The dimensionless torque curve of the turntable starting torque is shown below. Figure 2 As shown, the horizontal axis t represents time in minutes; the vertical axis represents the unit value of the turntable torque, which is dimensionless. A sudden increase in turntable torque can easily damage the turntable, shorten the equipment's lifespan, and lead to accidents such as generator overload, excessive current, and coil breakdown. Therefore, there is an urgent need for a starting method for high-voltage pipeline pressure reducing equipment that allows for a smooth increase in starting torque, thereby improving equipment safety and lifespan. Summary of the Invention

[0003] In view of this, the present invention provides a simple and low-cost method for starting a high-pressure pipeline pressure reducing device, thereby solving the problem of starting a high-pressure pipeline pressure reducing device.

[0004] This invention includes the following steps:

[0005] S1. Close the clean water inlet valve and the slurry inlet valve, and place the flow regulator in the closed position. Use the frequency converter to set the motor to motor operation mode and adjust the motor speed to the rated speed;

[0006] S2. Open the clean water inlet valve to 10% opening. Under the action of gravity, the clean water flows from top to bottom along the vertical pipe, and after passing through the upper conical pipe, it is sprayed out at high speed. After the clean water is sprayed onto the flow regulating plate, it is completely deflected away from the turntable. The liquid level in the vertical pipe is H. w1 ;

[0007] S3. Open the flow regulating plate to 10% opening, so that 10% of the clean water is sprayed onto the turntable, and stabilize the turntable torque at T. w1 ;

[0008] S4. Open the clean water inlet valve to 20% opening degree, increasing the liquid level in the vertical pipeline to H. w2 ;

[0009] S5. Open the flow regulating plate to 20% opening, so that 20% of the clean water is sprayed onto the turntable, and stabilize the turntable torque at T. w2 ;

[0010] S6. Gradually open the clean water inlet valve and flow regulator plate in 10% increments until the clean water inlet valve is 100% open and the flow regulator plate is 100% open. The liquid level in the vertical pipeline should then increase to H. w10 All the clean water was sprayed onto the turntable to stabilize the turntable torque at T. w10 ;

[0011] S7. Open the slurry inlet valve to 10% opening, close the clean water inlet valve to 90% opening, open the mixing tank to mix the slurry and clean water evenly, and then inject it into the vertical pipeline. The liquid density is ρ1, so that the turntable torque is stabilized at T. w11 ;

[0012] S8. Open the slurry inlet valve to 20% opening and close the clean water inlet valve to 80% opening. After the slurry and clean water are evenly mixed in the mixing tank, inject them into the vertical pipeline. The liquid density is ρ2, so that the turntable torque is stabilized at T. w12 ;

[0013] S9. Gradually open the slurry inlet valve and close the clean water inlet valve in 10% increments until the slurry inlet valve is 100% open. Then, completely close the clean water inlet valve and inject the slurry into the vertical pipeline. The liquid density is ρ. 10 This stabilizes the turntable torque at T. w20 ;

[0014] S10. Set up a frequency converter to put the motor in generator mode, converting all the energy of the slurry during the filling process into electrical energy, so that the mine lighting system can work stably.

[0015] The beneficial technical effects of this invention are:

[0016] 1. This invention gradually increases the torque of the high-pressure pipeline pressure reducing equipment, enabling smooth start-up of the high-pressure pipeline pressure reducing equipment, avoiding damage caused by excessive instantaneous torque of the turntable, and extending the service life of the equipment; it also avoids instantaneous overload of the motor and prevents excessive instantaneous current from breaking down the coil.

[0017] 2. The equipment required for this invention is simple and requires little investment. The liquid density in the vertical pipeline is adjusted by using a slurry inlet valve and a clean water inlet valve. The flow rate injected to the turntable is adjusted by changing the valve opening and the flow regulating plate opening, so as to gradually increase the momentum of the liquid injected to the turntable and steadily improve the torque. Attached Figure Description

[0018] Figure 1 Schematic diagram of a high-pressure pipeline pressure reducing device;

[0019] Figure 2 Dimensionless curve of the normal starting torque of pressure reducing equipment in high-pressure pipelines;

[0020] Figure 3 Diagram showing the closed position of the flow regulator plate;

[0021] Figure 4 Diagram showing the opening position of the flow regulating plate;

[0022] Figure 5 Diagram showing the 100% opening position of the flow regulating plate;

[0023] Figure 6 Dimensionless flow curve for the turntable;

[0024] Figure 7 For the dimensionless density curve of the filling liquid;

[0025] Figure 8 This is a dimensionless comparison curve of the starting torque of the present invention.

[0026] Component markings in the diagram: 1-Clear water inlet valve, 2-Slurry inlet valve, 3-Frequency converter, 4-Motor, 5-Upper housing conical tube, 6-Turntable, 7-Vertical pipeline, 8-Flow regulating plate, 9-Mixing tank, 10-Lighting system. Detailed Implementation

[0027] To make the technical solutions and beneficial effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the following embodiments are some, but not all, embodiments of the present invention. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative effort are all within the protection scope of the present invention.

[0028] Example 1

[0029] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, a method for starting a high-pressure pipeline pressure reducing device includes the following steps:

[0030] S1. Close the clean water inlet valve 1. Close the slurry inlet valve 2. Set the flow regulating plate 8 to the closed position. Use the frequency converter 3 to set the motor 4 to motor mode and adjust the speed of the motor 4 to the rated speed.

[0031] S2. Open the clean water inlet valve to 10% opening. Under the action of gravity, the clean water flows from top to bottom along the vertical pipe 7, and after passing through the upper conical pipe 5, it is sprayed out at high speed. After the clean water is sprayed onto the flow regulating plate 8, it is completely deflected away from the turntable 6. The liquid level in the vertical pipe 7 remains stable, marked as H. w1 The unit is meters (m).

[0032] S3, such as Figure 4 As shown, open the flow regulating plate to 8 to 10% to spray 10% clean water onto the turntable 6. Maintain this state for 30 seconds to stabilize the torque of the turntable 6. The torque value is marked as T. w1 The unit is N·m;

[0033] S4. Open the clean water inlet valve to 1-20% opening. The liquid level in vertical pipeline 7 increases and remains stable, marked as H. w2 The unit is meters (m).

[0034] S5. Open the flow regulating plate to 8-20% to spray 20% clean water onto the turntable 6. Maintain this state for 30 seconds to stabilize the torque of the turntable 6. The torque value is marked as T. w2 The unit is N·m;

[0035] S6. Gradually open the clean water inlet valve 1 and the flow regulating plate 8 in 10% increments until the clean water inlet valve 1 is 100% open and the flow regulating plate 8 is 100% open. The liquid level in the vertical pipeline 7 will increase and remain stable, marked as H. w10 The unit is m, such as Figure 5 As shown, all clean water is sprayed onto turntable 6 and maintained in this state for 30 seconds to stabilize the torque of turntable 6. The torque value is marked as T. w10 The unit is N·m;

[0036] S7. Open the slurry inlet valve to 2-10% opening, close the clean water inlet valve to 1-90% opening, open the mixing tank 9 to mix the slurry and clean water evenly, and then inject it into the vertical pipe 7. The liquid density is marked as ρ1, unit kg / m³. 3 Maintain this state for 30 seconds to stabilize the torque of turntable 6. The torque value is marked as T. w11 The unit is N·m;

[0037] S8. Open the slurry inlet valve to 20% opening and close the clean water inlet valve to 10% opening. After the slurry and clean water are evenly mixed in the mixing tank 9, inject the mixture into the vertical pipe 7. The liquid density is marked as ρ2, and the unit is kg / m³. 3Maintain this state for 30 seconds to stabilize the torque of turntable 6. The torque value is marked as T. w12 The unit is N·m;

[0038] S9. Gradually open the slurry inlet valve 2 at a 10% opening rate and close the clean water inlet valve 1 until the slurry inlet valve 2 is opened to 100%. Then, completely close the clean water inlet valve 1 and inject the slurry into the vertical pipeline 7. The liquid density is marked as ρ. 10 Unit: kg / m 3 Maintain this state for 30 seconds to stabilize the torque of turntable 6. The torque value is marked as T. w20 The unit is N·m;

[0039] S10. Set the frequency converter 3 to make the motor 4 work as a generator, converting all the energy of the slurry during the filling process into electrical energy, so as to realize the stable operation of the mine lighting system 10.

[0040] This is one of the most basic embodiments of the present invention. Clean water is used as the starting medium for the high-pressure pipeline pressure reducing equipment. The flow rate injected to the rotary table is changed using a slurry inlet valve, a clean water inlet valve, and a flow regulating plate. During implementation, the liquid level H in the vertical pipeline is controlled. w Gradually increase. For example... Figure 6 The figure shows the dimensionless curve of the flow rate received by the rotary table. The horizontal axis t is time, in minutes; the vertical axis Q is the unit value of the flow rate received by the rotary table, which is the ratio of the flow rate in each step of Example 1 to the maximum flow rate, and is dimensionless. In the process from S1 to S6, the flow rate to the rotary table is subject to dual regulation by the clean water inlet valve and the flow regulating plate within a time of about 0 to 5.5 minutes, showing an exponential upward trend. Starting from S7, the flow regulating plate is at 100% opening, and the flow rate received by the rotary table is equal to the flow rate in the vertical pipeline. The flow rate received by the rotary table remains unchanged.

[0041] like Figure 7 The figure shows a dimensionless curve of the filling liquid density. The horizontal axis t represents time in minutes, and the vertical axis ρ represents the unit value of the filling liquid density, which is the ratio of the liquid density to the pure slurry density in each step of Example 1, and is dimensionless. In processes S1 to S6, the medium is clean water within 0 to 5.5 minutes, and the density unit value is 0.5. In processes S7 to S9, the time is approximately 5.5 to 10 minutes, the clean water inlet valve gradually closes and the slurry inlet valve gradually opens, and the liquid density increases linearly. After S10, the medium becomes slurry, and the density ρ unit value is 1.

[0042] like Figure 8 The figure shows a dimensionless comparison curve of the starting torque of the present invention. The horizontal axis t represents time in minutes; the vertical axis T represents the unit value of the torque received by the turntable, which is the value of T in each step of Example 1. w With T w20The ratio is dimensionless; the solid line represents the conventional starting torque, and the dashed line represents the starting torque of this invention. When the motor operates at its rated speed, according to the momentum theorem, the turntable torque is related to the momentum of the filling liquid, i.e., it is related to the flow rate, density, and liquid injection velocity. The liquid injection velocity is related to the liquid level height H in the vertical pipe. w The torque is directly proportional to the square root of the liquid level, and the liquid level height is related to the flow rates of clean water and slurry. Analysis shows that during processes S1 to S6, the turntable torque exhibits an exponential upward trend within approximately 0 to 5.5 minutes. During processes S7 to S9, the turntable torque exhibits a linear upward trend within approximately 5.5 to 10 minutes. After S10, the turntable torque stabilizes at the rated torque. This implementation method requires simple equipment and low investment, effectively saving costs. The torque curve during startup is more stable than that of conventional startup torque curves, ensuring a gradual increase in the torque on the high-pressure pipeline pressure reducing equipment, achieving smooth startup of the high-pressure pipeline pressure reducing equipment, and avoiding damage to the turntable and motor caused by excessive instantaneous turntable torque.

[0043] The present invention and its embodiments have been described above by way of example. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention. The actual implementation is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar embodiments and examples without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A method for starting a high-pressure pipeline pressure reducing device, Its features include the following steps: S1. Close the clean water inlet valve (1), close the slurry inlet valve (2), place the flow regulating plate (8) in the closed position, use the frequency converter (3) to set the motor (4) to motor mode, and adjust the speed of the motor (4) to the rated speed. S2. Open the clean water inlet valve (1) to 10% opening. Under the action of gravity, the clean water flows from top to bottom along the vertical pipe (7), and after passing through the upper conical pipe (5), it is sprayed out at high speed. After the clean water is sprayed onto the flow regulating plate (8), it is completely deflected away from the turntable (6). The liquid level height of the vertical pipe (7) is H. w1 ; S3. Open the flow regulating plate (8) to 10% opening, so that 10% of the clean water is sprayed onto the turntable (6), and the torque of the turntable (6) is stabilized at T. w1 ; S4. Open the clean water inlet valve (1) to 20% opening, and increase the liquid level in the vertical pipeline (7) to H. w2 ; S5. Open the flow regulating plate (8) to 20% opening, so that 20% of the clean water is sprayed onto the turntable (6), and the torque of the turntable (6) is stabilized at T. w2 ; S6. Gradually open the clean water inlet valve (1) and the flow regulating plate (8) in 10% increments until the clean water inlet valve (1) is 100% open and the flow regulating plate (8) is 100% open. The liquid level in the vertical pipeline (7) increases to H. w10 All the clean water was sprayed onto the turntable (6) to stabilize the torque of the turntable (6) at T. w10 ; S7. Open the slurry inlet valve (2) to 10% opening, close the clean water inlet valve (1) to 90% opening, open the mixing tank (9) to mix the slurry and clean water evenly, and then inject it into the vertical pipeline (7). The liquid density is ρ1, so that the torque of the turntable (6) is stabilized at T. w11 ; S8. Open the slurry inlet valve (2) to 20% opening and close the clean water inlet valve (1) to 80% opening. After the slurry and clean water are evenly mixed in the mixing tank (9), inject them into the vertical pipeline (7). The liquid density is ρ2, so that the torque of the turntable (6) is stabilized at T. w12 ; S9. Gradually open the slurry inlet valve (2) at a 10% opening ratio and close the clean water inlet valve (1) until the slurry inlet valve (2) is opened to 100%. Then, completely close the clean water inlet valve (1) and inject the slurry into the vertical pipeline (7). The liquid density is ρ. 10 This stabilizes the torque of the turntable (6) at T. w20 ; S10. Set the frequency converter (3) to make the motor (4) work as a generator, convert all the energy of the slurry during the filling process into electrical energy, so that the mine lighting system (10) can work stably.

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