Device and method for gas-water cleaning of long distance filling pipelines

Abstract

This invention provides an apparatus and method for cleaning long-distance filling pipelines using a gas-water mixture, belonging to the field of paste pipeline transportation technology. The apparatus includes a gas supply system, a water supply system, a gas-water mixing system, a safety assurance system, and a data acquisition system. During pipeline cleaning, the gas supply system is turned on after filling is completed; high-pressure gas mixes with the cleaning water to form a gas-water two-phase impact flow; the gas-water impact flow cleans the filling residue inside the pipeline along the transportation pipeline; cleaning ends when the solid content of the cleaning water decreases to 1%–3%. The addition of high-pressure gas intensifies turbulence, rapidly accumulates and releases energy, and induces localized water hammer, thereby improving pipeline cleaning efficiency. This invention can reduce the amount of cleaning water used from the usual 1.3 times the volume of the pipeline to be cleaned to 0.7–0.9 times, and reduce the pipeline cleaning time by 30%. This invention has the advantages of low water consumption, short pipeline cleaning time, and good cleaning effect, overcoming the current problem of high water consumption in pipeline cleaning.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paste pipeline transportation, and in particular to a device and method for air-water cleaning of long-distance filling pipeline. BACKGROUND

[0002] Currently, paste filling is applied in many mines due to its advantages of economy, environmental protection, safety, and high efficiency. Before and after paste transportation, in order to check whether the pipeline is unobstructed and avoid paste deposition in the pipeline, pipeline cleaning is necessary to keep the pipeline clean. A clean pipeline can reduce the resistance along the pipeline and avoid pipeline blockage and explosion accidents.

[0003] For mines using paste filling, in order to prevent residual slurry in the filling pipeline from causing pipe blockage and reducing the effective pipe diameter, the traditional method is to use water to wash (lubricate) the pipeline. When the filling pipeline is long (> 4 km), in order to ensure that the pipeline is fully washed (lubricated), the washing water usage is as high as 1.0-1.3 times the volume of the pipeline, and the lubricating water usage is as high as 0.2-0.3 times the volume of the pipeline. The high washing (lubricating) water usage leads to three problems: high washing water usage, many sedimentation tanks, and long time consumption of 1-2 hours. Currently, washing devices based on air-water method have been developed, such as a self-flowing pipeline air-water linkage flushing device (CN204817371U) and an air-water linkage washing device (CN210253402U), but these devices use a box to mix air-water, and the upper limit of the flow is less than 3 m³, which is not suitable for long-distance pipeline cleaning. Therefore, it is urgent to propose an air-water two-phase flow cleaning method for long-distance filling pipeline, which can efficiently clean the filling pipeline under the premise of reducing water usage. In addition, it can save costs, ensure filling quality, reduce underground pollution, improve filling efficiency, and improve the underground filling operation environment. SUMMARY

[0004] The present application provides a device and method for air-water cleaning of long-distance filling pipeline, which can use air-water two-phase flow to intensify turbulence and local water hammer effect, reducing washing (lubricating) water usage by about 30%-50%. At the same time, the cleaning time is reduced by 30%, the number of sedimentation tanks is reduced, and the underground environment is also improved to a certain extent.

[0005] To solve the above-mentioned application purposes, the technical solutions provided by the present application are as follows:

[0006] A device for air-water cleaning of long-distance filling pipeline, comprising a water supply system, a gas supply system, an air-water mixing system, a safety guarantee system, and a data acquisition system.

[0007] The water supply system comprises a high water tank and a valve;

[0008] The gas supply system comprises a positive displacement air compressor, an air tank, a pulse timer and a safety valve;

[0009] The gas-water mixing system comprises an air inlet nozzle;

[0010] The safety guarantee system comprises an automatic exhaust valve and a three-way valve A;

[0011] The data acquisition system comprises an electromagnetic flowmeter and a pressure gauge arranged on the air tank;

[0012] The three-way connection is used in the ground filling station to connect the water supply system, the gas supply system and the main conveying pipeline;

[0013] The paste mixer and the high water tank are connected to the main conveying pipeline through a pipeline, the positive displacement air compressor is connected to the air tank, the air inlet nozzle is arranged at the end of the outlet pipeline of the air tank, and the air inlet nozzle is connected to the main conveying pipeline; the main conveying pipeline, the filling mine and the sedimentation tank are connected through a three-way valve B.

[0014] Valves are arranged on the pipelines of the high water tank and the outlet of the paste mixer.

[0015] The paste slurry in the main conveying pipeline is self-flowing, and the mass concentration of the paste slurry is 55% to 80%.

[0016] The pulse timer and the safety valve are arranged on the outlet pipeline of the air tank. The safety valve is a normally closed valve which is opened to mix with the pipe washing water when the pressure in the high-pressure gas pipeline exceeds the set value. At the same time, the safety valve can prevent the pipe washing water from entering the high-pressure gas pipeline. The pressure setting range of the safety valve is 0.3 to 0.7 MPa.

[0017] The main conveying pipeline is provided with an electromagnetic flowmeter at the ground and an automatic exhaust valve at the underground.

[0018] The air inlet nozzle is in one of a circular shape, a rectangular shape and a strip gap, and is arranged in the middle or on the surface of the pipeline. The air inlet nozzle is connected to the safety valve and is opened when the air pressure reaches the preset value.

[0019] The pulse timer is a device for controlling the air inlet time and the water inlet time according to the pipeline diameter and the air pressure. When the pipeline is washed with air and water, the air is intermittently supplied, and the air inlet time and the water inlet time are adjusted between 0 and 60 seconds. The pulse frequency is 5 to 10 seconds for air inlet and 5 to 10 seconds for air stop.

[0020] The application method of the device comprises the following steps:

[0021] S1, 10-20 minutes before wetting the filling pipeline, open the volumetric air compressor, use a mechanical air speed meter to measure the wind speed at the outlet of the main conveying pipe sedimentation tank, and the wind speed is greater than 1 m / s, which is considered to be unobstructed, open the valve of the high-level water tank, and start to fill the pipeline with water;

[0022] S2, after wetting the filling pipeline, close the valve of the high-level water tank, and the paste slurry in the paste mixer is transported into the filling mine through the pipeline;

[0023] S3, when the filling volume in the filling mine is equal to 0.95-1.05 times the volume of the filling pipeline, stop transporting the paste slurry, and at the same time, start the pipeline cleaning operation;

[0024] S4, the pipeline cleaning process is: open the valve of the high-level water tank and the pulse timer, when the air pressure is greater than 0.3-0.7 MPa, the air-water washing pipeline is started, at this time, the paste slurry still flows to the filling mine; when it is observed that the filling mine is filled, open the three-way valve B to guide the washing water into the sedimentation tank;

[0025] S5, during the pipeline cleaning process, collect the washing water at the sedimentation tank washing water outlet every 5-10 minutes, and measure the solid content of the washing water with a mud sand content meter; when the solid content of the washing water at the sedimentation tank washing water outlet is reduced to 15-20%, close the valve and stop the water inlet; after the residual washing water in the pipeline is completely discharged and the solid content of the washing water is reduced to 1-3%, stop the pipeline cleaning operation.

[0026] The water used in the pipeline wetting of step S1 is 15-20% of the volume of the pipeline, and the water flow rate for wetting the pipeline is 1.0-1.5 times the filling flow rate.

[0027] In step S4, when the air-water washing pipeline is used, the water-air volume ratio is 1:8-3:1.

[0028] Compared with the prior art, the above technical solution has at least the following beneficial effects:

[0029] The above scheme solves the problem of high water consumption in the previous filling and washing (wetting) pipeline. The high-pressure gas is mixed with the washing water to form a gas-water two-phase flow. The washing water flow rate is increased from 1.5-2.5 m / s to 2.0-3 m / s or more, and the cleaning effect is better. At the same time, the turbulent flow and local water hammer effect are ingeniously utilized, so that the pipeline is cleaned with less water. This scheme reduces the water consumption by about 30-50%, and reduces the number of underground sedimentation tanks, which has significant economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without any creative effort based on these drawings also belong to the protection scope of the present application.

[0031] Figure 1 Structure diagram of the device for air-water cleaning long-distance filling pipeline of the present application;

[0032] Figure 2 Schematic diagram of a circular air inlet nozzle in the device for air-water cleaning long-distance filling pipeline of the present application;

[0033] Figure 3 Schematic diagram of a square air inlet nozzle in the device for air-water cleaning long-distance filling pipeline of the present application;

[0034] Figure 4 Schematic diagram of a strip air inlet nozzle in the device for air-water cleaning long-distance filling pipeline of the present application.

[0035] The following is the explanation of the reference signs in the drawings:

[0036] 1-paste mixer; 2-high water tank; 3-valve; 4-volumetric air compressor; 5-gas storage tank; 6-pulse timer; 7-safety valve; 8-air inlet nozzle; 9-electromagnetic flowmeter; 10-three-way valve A; 11-automatic exhaust valve; 12-three-way valve B; 13-settling tank; 14-mining room. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be described clearly and completely in the following with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort belong to the protection scope of the present application.

[0038] It should be noted that the "upper", "lower", "left", "right", "front", "rear" and the like used in the present application are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] The present application provides a device and method for air-water cleaning long-distance filling pipeline.

[0040] As shown in the drawing, Figure 1 the device comprises a water supply system, a gas supply system, an air-water mixing system, a safety guarantee system and a data acquisition system.

[0041] The water supply system comprises a high water tank 2 and a valve 3;

[0042] The gas supply system comprises a positive displacement air compressor 4, a gas storage tank 5, a pulse timer 6 and a safety valve 7;

[0043] The gas-water mixing system comprises an air inlet nozzle 8;

[0044] The safety guarantee system comprises an automatic exhaust valve 11 and a three-way valve A10;

[0045] The data acquisition system comprises an electromagnetic flowmeter 9 and a pressure gauge arranged on the gas storage tank 5;

[0046] The three-way connection is used in the ground filling station to connect the water supply system, the gas supply system and the main conveying pipeline;

[0047] The paste mixer 1 and the high water tank 2 are connected to the main conveying pipeline through a pipeline, the positive displacement air compressor 4 is connected to the gas storage tank 5, the air inlet nozzle 8 is arranged at the end of the outlet pipeline of the gas storage tank 5, the air inlet nozzle 8 is connected to the main conveying pipeline, and the main conveying pipeline, the filling mine 14 and the sedimentation tank 13 are connected through the three-way valve B12.

[0048] The valve 3 is arranged on the pipeline of the outlet of the high water tank 2 and the paste mixer 1.

[0049] The paste slurry in the main conveying pipeline is self-flowing, and the mass concentration of the paste slurry is 55% to 80%.

[0050] The pulse timer 6 and the safety valve 7 are arranged on the outlet pipeline of the gas storage tank 5.

[0051] The electromagnetic flowmeter 9 is arranged on the main conveying pipeline on the ground, and the automatic exhaust valve 11 is arranged underground.

[0052] As shown in Figure 2 , Figure 3 and Figure 4 , the shape of the air inlet nozzle is one of a circle, a rectangle or a strip gap, and the air inlet nozzle is arranged in the middle or on the surface of the pipeline.

[0053] When the pulse timer is used for gas-water pipe washing, the air is intermittently supplied, and the air supply time and the water supply time are adjusted to be between 0 and 60 s; the pulse frequency is that the air is supplied for 5 to 10 s and stopped for 5 to 10 s.

[0054] The application method of the device comprises the following steps:

[0055] S1, 10-20 minutes before wetting the filling pipeline, open the volumetric air compressor, use a mechanical air speed meter to measure the air speed at the outlet of the main conveying pipe sedimentation tank, if the air speed is greater than 1 m / s, consider that the pipeline is unobstructed, open the valve of the high-level water tank, and start to wet the filling pipeline by water;

[0056] S2, after wetting the filling pipeline, close the valve of the high-level water tank, and transport the paste slurry in the paste mixer into the filling mine through the pipeline;

[0057] S3, when the volume of the filling mine to be filled is equal to 0.95-1.05 times the volume of the filling pipeline, stop transporting the paste slurry, and at the same time, start the pipeline cleaning operation;

[0058] S4, the pipeline cleaning process is as follows: open the valve of the high-level water tank and the pulse timer, when the air pressure is greater than 0.3-0.7 MPa, automatically enter the air, start the air-water pipe cleaning, at this time, the paste slurry still flows to the filling mine, when it is observed that the filling mine is filled, open the three-way valve B, and guide the pipe cleaning water into the sedimentation tank;

[0059] S5, during the pipeline cleaning process, collect the pipe cleaning water at the outlet of the sedimentation tank every 5-10 minutes, and measure the solid content of the pipe cleaning water by using a mud sand content meter, when the solid content of the pipe cleaning water at the outlet of the sedimentation tank is reduced to 15%-20%, close the valve and stop water inflow, when the residual pipe cleaning water in the pipeline is completely discharged and the solid content of the pipe cleaning water is reduced to 1%-3%, stop the pipeline cleaning operation.

[0060] The water consumption for wetting the filling pipeline in step S1 is 15%-20% of the volume of the pipeline, and the water flow for wetting the filling pipeline is 1.0-1.5 times the filling flow.

[0061] In step S4, when the air-water pipe cleaning is performed, the water-air volume ratio is 1:8-3:1.

[0062] The following will be described in conjunction with specific embodiments.

[0063] In specific implementation, the gas supply flow of the gas supply system is about 10-40 m³ / min, and the air pressure is 0.2-0.7 MPa; the water supply flow of the water supply system is about 1-5 m³ / min, and the water pressure is 0.1-0.3 MPa; the water-air volume ratio of the air-water mixing system is 1:8-3:1; the data acquisition system can record the flow and pressure data during the pipeline cleaning process.

[0064] The specific cleaning process is as follows:

[0065] S1: 10-20 min before wetting filling pipeline, open volumetric air compressor 4, when air pressure > 0.3 MPa, start to fill air. Use mechanical air speed meter to measure air speed at the outlet of main conveying pipeline sedimentation tank, when air speed is greater than 1 m / s, consider that the pipeline is unblocked. Start to discharge water to wet the filling pipeline. Considering that the volume of main conveying pipeline of the mine is about 180 m3, the filling flow rate is about 60-100 m3 / h. The water consumption for wetting the pipeline is about 27-36 m3 / time, the water flow rate for wetting the pipeline is 70-150 m3 / h, and the wetting time is about 10-30 min / time;

[0066] S2: after wetting the filling pipeline, the paste slurry is conveyed into the filling mine through the pipeline; the specification of the filling mine of the mine is: 50 m long, 3 m wide, 3 m high, and the volume is 450 m3.

[0067] S3: pay attention to the situation in the filling mine during the filling process. Every 5 min, insert a 2 m long steel bar into the filling mine to determine the volume to be filled. When the filling height in the filling mine reaches 1.8 m, that is, the length of the wetted section of the steel bar is 0.8 m, it indicates that the volume to be filled in the filling mine is about 171-189 m3. Stop conveying the paste slurry. At the same time when the paste slurry stops conveying, start to clean the pipeline.

[0068] S4: the cleaning pipeline process is: open the water inlet valve and the pulse type timer, when the air pressure is greater than 0.5 MPa, automatically fill air, and start air-water pipe cleaning (fill air for 5 s, stop air for 5 s). At this time, there are still 180 m3 of residual paste slurry in the main conveying pipeline, and the residual slurry still flows to the filling mine; when it is observed that the slurry concentration in the filling mine is reduced, open the three-way valve B12 to guide the pipe cleaning water into the sedimentation tank 13.

[0069] S5: during the cleaning pipeline process, collect the pipe cleaning water at the outlet of the sedimentation tank every 5 min, and measure the solid content of the pipe cleaning water by using the mud sand content meter. When the solid content at the outlet of the sedimentation tank is reduced to 20%, it indicates that the residual 180 m3 of pipe cleaning water in the main conveying pipeline can be completely cleaned, so that the solid content is reduced from 15% to 1%. Then, close the valve 3 to stop water filling. After the residual pipe cleaning water in the pipeline is completely discharged and the solid content of the pipe cleaning water is reduced to 1%, stop the cleaning pipeline operation.

[0070] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of using a gas-water cleaning long distance filling pipeline, using a gas-water cleaning long distance filling pipeline device, characterized in that, The device for cleaning long distance filling pipeline by gas-water includes water supply system, gas supply system, gas-water mixing system, safety guarantee system and data acquisition system. The water supply system includes high water tank and valve. The gas supply system includes positive displacement air compressor, gas storage tank, pulse timer and safety valve. The gas-water mixing system includes air inlet nozzle. The safety guarantee system includes automatic exhaust valve and three-way valve A. The data acquisition system includes electromagnetic flowmeter and pressure gauge on the gas storage tank. The three-way connection is used in the ground filling station to connect water supply system, gas supply system and main conveying pipeline. The paste mixer and high water tank are connected to the main conveying pipeline by pipeline, the positive displacement air compressor is connected to the gas storage tank, the air inlet nozzle is arranged at the end of the gas storage tank outlet pipeline, and the air inlet nozzle is connected to the main conveying pipeline. The steps include: S1, 10-20 minutes before wetting the filling pipeline, the positive displacement air compressor is started, the wind speed is measured at the outlet of the main conveying pipeline and the sedimentation tank by using mechanical anemometer, the pipeline is considered to be unblocked when the wind speed is greater than 1 m / s, the valve of the high water tank is opened, and the pipeline is wetted by water; S2, after wetting the filling pipeline, the valve of the high water tank is closed, and the paste slurry in the paste mixer is conveyed into the filling room through the pipeline; S3, when the filling volume in the filling room is equal to 0.95-1.05 times of the filling pipeline volume, the paste slurry conveying is stopped, and the pipeline cleaning operation is started; S4, the pipeline cleaning process is as follows: the valve of the high water tank and the pulse timer are opened, the air is automatically introduced when the air pressure is greater than 0.3-0.7 MPa, the gas-water pipeline cleaning is started, at this time, the paste slurry still flows to the filling room, the three-way valve B is opened when the filling room is observed to be filled, and the pipeline cleaning water is introduced into the sedimentation tank; S5, during the pipeline cleaning process, the pipeline cleaning water is collected at the outlet of the sedimentation tank every 5-10 minutes, the solid content of the pipeline cleaning water is measured by using the mud sand content meter, the valve is closed and the water feeding is stopped when the solid content of the pipeline cleaning water at the outlet of the sedimentation tank is reduced to 15-20%, and the pipeline cleaning operation is stopped after the residual pipeline cleaning water in the pipeline is completely discharged and the solid content of the pipeline cleaning water is reduced to 1-3%; The pulse timer is used for intermittent air feeding during the gas-water pipeline cleaning, and the air feeding time and the water feeding time are adjusted to be 0-60 seconds, the pulse frequency is 5-10 seconds for air feeding and 5-10 seconds for air stopping; The water consumption for wetting the filling pipeline in step S1 is 15-20% of the pipeline volume, and the water flow for wetting the filling pipeline is 1.0-1.5 times of the filling flow; The water-gas volume ratio is 1:8-3:1 during the gas-water pipeline cleaning in step S4.

2. The use of a gas-water cleanout long distance fill pipe according to claim 1, characterized in that, The paste slurry in the main conveying pipeline is self-flowing, and the mass concentration of the paste slurry is 55-80%.

3. The use of a gas-water cleanout long distance fill pipe according to claim 1, wherein, The pulse timer and the safety valve are arranged on the gas storage tank outlet pipeline.

4. The use of a gas-water cleanout long distance fill pipe according to claim 1, wherein, The electromagnetic flowmeter is arranged on the main conveying pipeline at the ground, and the automatic exhaust valve is arranged underground.

5. The use of a gas-water cleanout long distance fill pipe according to claim 1, wherein, The air inlet nozzle is in one of circular, rectangular and strip shapes, and is arranged in the middle or on the surface of the pipeline.

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