Device and conveying method for long-distance pipeline conveying of gangue slurry

Abstract

The present invention discloses a long-distance pipeline conveying device for coal gangue slurry filling, which includes a ground pulp-making device. The ground pulp-making device is sequentially connected to a pumping station, a first slurry conveying pipeline, a secondary stirring and conveying device, and a second slurry conveying pipeline through pipelines. By using this device to perform segmented treatment on the long-distance slurry conveying pipeline, it is ensured that the coal gangue slurry does not precipitate and segregate during the long-distance pipeline conveying process. The present invention also discloses a pipeline conveying method using the above device, which includes Step 1: mixing fine coal gangue particles and powder with water and adding additives to obtain a first-stage coal gangue slurry; Step 2: adding water and additives to the first-stage coal gangue slurry in a secondary stirring device for stirring to obtain a second-stage coal gangue slurry; Step 3: conveying the second-stage coal gangue slurry to the underground goaf through the second slurry conveying pipeline. By using this method, the water supply metering and control system is interlocked with the flowmeter on the first slurry conveying pipeline, and the water supply volume can be adjusted in real time according to the flow rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal gangue solid waste disposal, and relates to a long-distance pipeline conveying device for coal gangue slurry filling, and the present invention also relates to a conveying method of the conveying device. Background Art

[0002] During the large-scale production and utilization of coal resources in China, a large amount of solid waste such as coal gangue will be generated. The traditional way to deal with coal gangue is to discharge it at the surface gangue yard or landfill it in the gullies around the mining area. With the enhancement of social environmental protection awareness, the environmental standards and related requirements during the mining area development are becoming increasingly strict. The external discharge of gangue and the formed gangue hill bring an undeniable negative impact on the green development of the mining area. How to safely, efficiently and greenly dispose of coal gangue has become an urgent problem to be solved by coal mining enterprises.

[0003] Slurry filling is a new filling method proposed in recent years. Its basic idea is to crush solid waste such as coal gangue generated during the coal production and utilization process and add water to make a slurry with a specific concentration, and then convey it to the goaf of the coal mine through a pipeline. However, limited by the complexity of the actual working conditions of the underground roadway, the slurry pipelines laid underground are uneven and have many bends. During the long-distance pipeline conveying process of the slurry, precipitation and segregation are likely to occur, resulting in pipe blockage accidents. Therefore, how to achieve the stable long-distance pipeline conveying of coal gangue slurry and at the same time ensure the fluidity of the slurry in the goaf is an urgent problem to be solved. Summary of the Invention

[0004] The first object of the present invention is to provide a long-distance pipeline conveying device for coal gangue slurry filling, which has the characteristics of ensuring that the coal gangue slurry does not precipitate and segregate during the long-distance pipeline conveying process and realizing the long-term stability of the coal gangue slurry.

[0005] Another object of the present invention is to provide a pipeline conveying method using the above device, which has the characteristics of adjusting the concentration of the coal gangue slurry twice by setting a secondary stirring device, a pumping device and a water supply device underground, and cooperating with the use of additives to meet the concentration requirement of the slurry flowing in the goaf.

[0006] The first technical solution adopted by the present invention is that a long-distance pipeline conveying device for coal gangue slurry filling includes a ground pulp making device, the ground pulp making device is connected to one end of a pumping station through a pipeline, the other end of the pumping station is connected to one end of a first slurry conveying pipeline, the other end of the first slurry conveying pipeline is connected to the feed port of a secondary stirring and conveying device, and the discharge port of the secondary stirring and conveying device is connected to a second slurry conveying pipeline.

[0007] The characteristics of the first technical solution of the present invention also lie in:

[0008] The ground pulping device includes a crushing station, which is connected to a silo through a conveyor belt. The discharge port of the silo is connected to the inlet of a mixer. The inlet of the mixer is also connected to a reservoir, and the outlet of the mixer is connected to a pumping station.

[0009] The secondary stirring and conveying device includes a secondary stirring device. There are several discharge ports of the secondary stirring device, and each discharge port of the secondary stirring device is correspondingly connected to a pumping device through a pipeline. The outlet of each pumping device is connected to a second slurry conveying pipeline. The inlet of the secondary stirring device is connected to the first slurry conveying pipeline. A water supply device is also connected to the secondary stirring device through a pipeline, and a water supply metering and control system is arranged on the pipeline between the secondary stirring device and the water supply device.

[0010] A valve and a flow meter are respectively installed on the first slurry conveying pipeline.

[0011] The second technical solution adopted by the present invention is a method for long-distance pipeline transportation of coal gangue slurry filling. The long-distance pipeline transportation device for coal gangue slurry filling in the above first technical solution is adopted, and it is specifically implemented according to the following steps:

[0012] Step 1: Mix the fine particles and powders of coal gangue stored in the silo with water through a mixer, and add additives to obtain the first-stage coal gangue slurry.

[0013] Step 2: Transport the first-stage coal gangue slurry to the secondary stirring device through the pumping station via the first slurry conveying pipeline, add water and additives in the secondary stirring device, and conduct sufficient stirring to obtain the second-stage coal gangue slurry.

[0014] Step 3: Transport the second-stage coal gangue slurry to the underground goaf through the pumping device and via the second slurry conveying pipeline.

[0015] The characteristics of the second technical solution of the present invention also lie in:

[0016] The additive is composed of one or more combinations of a water reducer, an air-entraining agent, and a thickener.

[0017] The particle size of the fine particles and powders of coal gangue is not greater than 5 mm, and the proportion of coal gangue fine particles with a particle size less than 0.5 mm in the first-stage coal gangue slurry is not less than 50%.

[0018] The mass concentration of the first-stage coal gangue slurry is greater than that of the second-stage coal gangue slurry. The mass percentage concentration of the first-stage coal gangue slurry is 78% - 85%, and the mass percentage concentration of the second-stage coal gangue slurry is 68% - 72%.

[0019] The method for determining the flow rate of water added to the secondary stirring device is as follows:

[0020]

[0021] Wherein, Q1 is the flow rate of the gangue slurry in the first stage, ρ1 is the density of the slurry in the first slurry pipeline, C1 is the concentration of the slurry in the first slurry pipeline, ρ2 is the density of the gangue slurry in the second stage, C2 is the concentration of the gangue slurry in the second stage, and ρ 水 is the density of the water added to the secondary stirring device.

[0022] The beneficial effects of the present invention are as follows:

[0023] The first technical solution of the present invention provides a long-distance pipeline transportation device for filling gangue slurry. By designing the first slurry pipeline, the secondary stirring and transportation device, and the second slurry pipeline to segment the long-distance slurry pipeline, it is ensured that the gangue slurry does not precipitate and segregate during the long-distance pipeline transportation process, realizing the stable transportation of the gangue slurry for a long time.

[0024] The second technical solution of the present invention provides a method for long-distance pipeline transportation of filling gangue slurry. By setting a secondary stirring device, a pumping device, and a water supply device underground, the concentration of the gangue slurry can be adjusted twice, and additives can be used in combination to meet the concentration requirements for the slurry to flow in the goaf; by interlinking the water supply metering and control system with the flowmeter on the first slurry pipeline, the water supply volume can be adjusted in real time according to the flow rate. Description of the Drawings

[0025] Figure 1 is the overall schematic diagram of the long-distance pipeline transportation device for filling gangue slurry of the present invention;

[0026] Figure 2 is the structural schematic diagram of the secondary stirring and transportation device in the long-distance pipeline transportation device for filling gangue slurry of the present invention.

[0027] In the figure, 1. Crushing station, 2. Bunker, 3. Mixer, 4. Reservoir, 5. Pumping station, 6. First slurry pipeline, 7. Secondary stirring and transportation device, 8. Second slurry pipeline, 9. Valve, 10. Flowmeter, 11. Pumping device, 12. Secondary stirring device, 13. Water supply device, 14. Water supply metering and control system. Detailed Embodiments

[0028] The present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0029] The present invention provides a long-distance pipeline transportation device for filling gangue slurry, as Figure 1As shown in the figure, it includes a ground pulp-making device. The ground pulp-making device is connected to one end of a pumping station 5 through a pipeline. The other end of the pumping station 5 is connected to one end of a first pulp transportation pipeline 6. The other end of the first pulp transportation pipeline 6 is connected to the feed inlet of a secondary stirring and transportation device 7. The discharge outlet of the secondary stirring and transportation device 7 is connected to a second pulp transportation pipeline 8. The secondary stirring and transportation device 7 can be arranged in the auxiliary transportation gateway or the return air gateway of the working face. The pipeline parameters of the first pulp transportation pipeline 6 and the second pulp transportation pipeline 8 are selected accordingly according to the flow rate of the coal gangue slurry inside the pipeline. Among them, the pipeline parameters mainly refer to the pipe diameter, pipe material, wall thickness, etc.

[0030] The ground pulp-making device includes a crushing station 1. The crushing station 1 is connected to a bunker 2 through a conveyor belt. The discharge outlet of the bunker 2 is connected to the feed inlet of a mixer 3. The feed inlet of the mixer 3 is also connected to a reservoir 4. The discharge outlet of the mixer 3 is connected to the pumping station 5.

[0031] The secondary stirring and transportation device 7, such as Figure 2 As shown in the figure, the secondary stirring and transportation device 7 includes a secondary stirring device 12. The secondary stirring device 12 can adopt vertical stirring or horizontal stirring. There are several discharge outlets of the secondary stirring device 12. Each discharge outlet of the secondary stirring device 12 is correspondingly connected to a pumping device 11 through a pipeline. The pumping device 11 provides pumping pressure for the transportation of the slurry with adjusted concentration. The outlet of each pumping device 11 is connected to a second pulp transportation pipeline 8. The feed inlet of the secondary stirring device 12 is connected to the first pulp transportation pipeline 6. A water supply device 13 is also connected to the secondary stirring device 12 through a pipeline. A water supply metering and control system 14 is arranged on the pipeline between the secondary stirring device 12 and the water supply device 13. The water supply metering and control system 14 cooperates with the flowmeter 10 on the first pulp transportation pipeline 6. According to the detected data, the water supply device 13 adjusts the water supply amount in real time to ensure the requirement of the slurry concentration. At the same time, by using the first pulp transportation pipeline 6 and the second pulp transportation pipeline 8 to segment the long-distance pulp transportation pipeline, it is ensured that the coal gangue slurry does not precipitate and segregate during the long-distance pipeline transportation process, and the long-term stability of the coal gangue slurry is realized.

[0032] A valve 9 and a flowmeter 10 are respectively installed on the first pulp transportation pipeline 6. The flowmeter 10 is used to monitor the flow rate inside the first pulp transportation pipeline 6 in real time.

[0033] The present invention also provides a method for long-distance pipeline transportation of coal gangue slurry filling by using the above device, which is specifically implemented according to the following steps:

[0034] Step 1: Mix the fine coal gangue particles and powder stored in the silo 2 with water through the mixer 3, and add additives to obtain the first-stage coal gangue slurry. The additives are composed of one or more combinations of water reducing agents, air entraining agents, and thickening agents. The particle sizes of the fine coal gangue particles and powder are not greater than 5 mm, and the proportion of fine coal gangue particles with a particle size less than 0.5 mm in the first-stage coal gangue slurry is not less than 50%. The water used for mixing can be domestic water or mine water, but there should be no large-particle impurities in the water.

[0035] Step 2: Transport the first-stage coal gangue slurry to the secondary mixing device 12 through the first slurry pipeline 6 via the pumping station 5. Add water and additives to the secondary mixing device 12 and stir thoroughly to obtain the second-stage coal gangue slurry. Adjust the concentration of the coal gangue slurry by adding water and additives, thereby increasing the fluidity of the coal gangue slurry in the goaf. Adding a secondary mixing process and a pumping device 11 underground can adjust the concentration of the coal gangue slurry twice and use additives in combination to meet the concentration requirements for the slurry to flow in the goaf.

[0036] The mass concentration of the first-stage coal gangue slurry is greater than that of the second-stage coal gangue slurry. The high mass concentration of the first-stage coal gangue slurry can prevent precipitation and segregation of the slurry during long-distance pipeline transportation, causing pipe blockage accidents; the low mass concentration of the second-stage coal gangue slurry can ensure that the coal gangue slurry flows and diffuses sufficiently in the caving zone, thereby achieving large-scale filling and disposal of coal gangue. Among them, the mass percentage concentration of the first-stage coal gangue slurry is 78% - 85%, and the mass percentage concentration of the second-stage coal gangue slurry is 68% - 72%.

[0037] The method for determining the flow rate of water added to the secondary mixing device 12 is as follows:

[0038]

[0039] Among them, Q1 is the flow rate of the first-stage coal gangue slurry, ρ1 is the density of the slurry in the first slurry pipeline 6, C1 is the concentration of the slurry in the first slurry pipeline 6, ρ2 is the density of the second-stage coal gangue slurry, C2 is the concentration of the second-stage coal gangue slurry, and ρ 水 is the density of the water added to the secondary mixing device 12.

[0040] Additives are admixtures that can improve the pumping ability of coal gangue slurry in pipelines. Generally, water reducing agents, air entraining agents, and thickening agents can be used as additives. Using a water reducing agent can improve the fluidity of coal gangue slurry; for coal gangue slurry with poor aggregate gradation or quality, an air entraining agent can be selected; for sparse coal gangue slurry, a thickening agent can be used, or a composite additive of several of the above materials can also be used, and its performance is better than that of a single material.

[0041] Step 3: The second-stage coal gangue slurry is transported to the underground goaf through the pumping equipment 11 and the second slurry pipeline 8.

[0042] The specific embodiments are as follows:

[0043] A coal mine is designed to dispose of gangue by filling with gangue slurry. The lithology of gangue is mainly siltstone and sandy mudstone. According to the laboratory test of the fluidity of gangue slurry in the collapse zone, when the mass percentage concentration of slurry is set between 70% and 72%, the fluidity and expansion of slurry are better. However, since the mine adopts inclined shaft development and the tunnel is undulating, the pipeline laid from the ground slurry station to the underground working face has large fluctuations and turns; in addition, in order to cross the tunnel, the pipeline needs to be plunged into the tunnel floor many times, resulting in more complicated slurry pipeline transportation conditions. During the slurry transportation process, coarse particles are prone to precipitation at the bends, plunge points and the lowest point of the undulating position, causing pipe blockage accidents. In order to solve the above problems, a long-distance pipeline transportation device for gangue slurry filling is used on site, and it is redesigned through the long-distance pipeline transportation method for gangue slurry filling. The specific transportation method is as follows:

[0044] First, a secondary mixing and conveying device 7 is arranged in the auxiliary transport chute of the working face. The main equipment of the secondary mixing and conveying device 7 is composed of a secondary mixing device, a pumping device, a water metering and control system, etc., and a ground pulping device is also provided;

[0045] Then, the gangue slurry filling long-distance pipeline transportation method is adopted, and the specific steps are as follows:

[0046] Step 1: Mix the fine particles and powder of coal gangue stored in the silo 2 with water through the mixer 3, add additives, adjust the mass concentration of the original ground pulping system, adjust the mass percentage concentration from 70% to 72% to 80% to 82%, and transport the coal gangue slurry with a higher concentration in the slurry pipeline of the first stage, wherein the adjusted coal gangue slurry density is 1800kg / m3, and the slurry flow rate is 60m3 / h;

[0047] Step 2, the first-stage gangue slurry is transported to the secondary stirring device 12 through the pump station 5 via the first slurry conveying pipeline 6, water and additives are added to the secondary stirring device 12, and fully stirred to obtain the second-stage gangue slurry. The mass percentage concentration of the second-stage gangue slurry is designed to be 70% to 72%, wherein the underground water is mine water with a density of 1000kg / m3; after calculation, the water flow rate in the water supply metering and control system 14 is 33.6m3 / h to 38.0m3 / h;

[0048] Step 3: The second-stage coal gangue slurry is transported to the slurry outlet of the underground goaf through the pumping equipment 11 and the second slurry pipeline 8.

[0049] By adopting the above-mentioned device and method, through segmented treatment of the long-distance slurry pipeline, it is ensured that the coal gangue slurry does not precipitate and segregate during the long-distance pipeline transportation process, realizing the long-term stability of the coal gangue slurry, and also solving the problem that the slurry pipeline transportation working conditions are relatively complex. During the slurry transportation process, coarse particle precipitation is likely to occur at the turning points, downward piercing points and the lowest points of the undulating positions, resulting in pipe blockage accidents.

Claims

1. Method for long-distance pipeline transportation of coal gangue slurry filling, characterized in that, A long-distance pipeline transportation device for filling coal gangue slurry is used, and the long-distance pipeline transportation device for filling coal gangue slurry comprises a ground slurry making device, the ground slurry making device is connected to one end of a pump station (5) through a pipeline, the other end of the pump station (5) is connected to one end of a first slurry delivery pipeline (6), the other end of the first slurry delivery pipeline (6) is connected to the feed port of a secondary stirring and conveying device (7), and the discharge port of the secondary stirring and conveying device (7) is connected to a second slurry delivery pipeline (8); The ground pulping device comprises a crushing station (1), the crushing station (1) is connected to a silo (2) via a conveyor belt, the discharge port of the silo (2) is connected to the feed port of a mixer (3), the feed port of the mixer (3) is also connected to a water reservoir (4), and the discharge port of the mixer (3) is connected to a pump station (5); The secondary stirring and conveying device (7) comprises a secondary stirring device (12), the secondary stirring device (12) has a plurality of discharge ports, each of the discharge ports of the secondary stirring device (12) is connected to a corresponding pumping device (11) via a pipeline, the outlet of each pumping device (11) is connected to a second slurry delivery pipeline (8), the feed port of the secondary stirring device (12) is connected to the first slurry delivery pipeline (6), the secondary stirring device (12) is also connected to a water supply device (13) via a pipeline, and a water supply metering and control system (14) is provided on the pipeline between the secondary stirring device (12) and the water supply device (13); Follow the steps below to implement it: Step 1: Mix the fine particles and powder of coal gangue stored in the silo (2) with water by a mixer (3), and add additives to obtain a first-stage coal gangue slurry; Step 2: transporting the first-stage coal gangue slurry through the pump station (5) and the first slurry conveying pipeline (6) to the secondary stirring device (12), adding water and additives to the secondary stirring device (12), and stirring the mixture sufficiently to obtain the second-stage coal gangue slurry; Step 3, transporting the second-stage coal gangue slurry to the underground goaf through the pumping equipment (11) and the second slurry pipeline (8); The mass concentration of the coal gangue slurry in the first stage is greater than that in the second stage. The mass percentage concentration of the coal gangue slurry in the first stage is 78% to 85%, and the mass percentage concentration of the coal gangue slurry in the second stage is 68% to 72%.

2. The method for long-distance pipeline transportation of coal gangue slurry filling according to claim 1, wherein The additive is composed of one or more of a water reducing agent, an air entraining agent and a thickening agent.

3. The method for long-distance pipeline transportation of coal gangue slurry filling according to claim 1, wherein, The particle size of the coal gangue fine particles and powder is not greater than 5 mm, and the proportion of coal gangue fine particles with a particle size less than 0.5 mm in the first-stage coal gangue slurry is not less than 50%.

4. The method for long-distance pipeline transportation of coal gangue slurry filling according to claim 1, characterized in that, The method for determining the flow rate of water added to the secondary stirring device (12) is as follows: Among them, is the flow rate of the coal gangue slurry in the first stage, is the density of the slurry in the first slurry pipeline (6), is the concentration of the slurry in the first slurry pipeline (6), is the density of the coal gangue slurry in the second stage, is the concentration of the coal gangue slurry in the second stage, is the density of the water added in the secondary stirring device (12).

5. The method for long-distance pipeline transportation of coal gangue slurry filling according to claim 1, characterized in that, A valve (9) and a flow meter (10) are respectively installed on the first slurry conveying pipeline (6).

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