A device and method for expanding the service range of a mine self-flow filling system

Abstract

The present application belongs to the technical field of mine filling, and particularly relates to a device and method for expanding the service range of a mine self-flow filling system. The device is composed of a shunting system, a double-pumping system and an accident handling system, and the method comprises three implementation steps of shunting buffering, pumping filling and accident handling. Through the changes of the pipeline in advance and the pressure boosting of the filling pump, the stable pressure of the whole filling process is realized, the self-flow pipeline and two pumping pipelines are connected by a four-way elbow to ensure the stability of the flow, and the problems of small service range of the mine self-flow filling system, large investment in the conversion to the pumping system and the problem of the filling pipeline cannot be utilized are solved, and the device has the advantages of simple process, wide application range, small reconstruction engineering quantity, small system investment and the like.

Description

Technical Field

[0001] This invention belongs to the field of mine backfilling technology, specifically relating to a device and method for expanding the service range of a mine gravity-flow backfilling system. Background Technology

[0002] Gravity-flowing backfilling systems utilize the elevation difference between the surface backfilling station and the underground goaf, employing the gravitational potential energy of the backfill slurry to overcome pipeline transport resistance and allow it to flow by gravity into the goaf. This method boasts significant advantages such as low energy consumption, low system investment, high slurry flow velocity, and large filling capacity, making it widely used in mines. However, due to the lack of additional transport power, the service range of gravity-flowing backfilling systems is relatively limited, only meeting the backfilling needs of goafs with a filling ratio of 6 or less.

[0003] After a surface gravity-flow backfilling system is built, to increase its service range and cover areas with a backfilling ratio exceeding 6, the common approach is to add pumping devices within the surface backfilling station to provide additional transport power. However, given a fixed backfilling system capacity, the working flow rate of pumping backfilling is often relatively low, generally about half that of gravity-flow backfilling. Therefore, the inner diameter of the pumping backfilling pipeline needs to be at least 1.4 times that of the gravity-flow pipeline. Thus, adding pumping devices to the surface to increase the service range of the gravity-flow system requires completely dismantling the original gravity-flow backfilling pipeline and replacing it with a pumping backfilling pipeline with a larger inner diameter. To fully utilize the original gravity-flow backfilling pipeline, increase the service range of the gravity-flow backfilling system, and reduce system modification investment, this invention provides a device and method for expanding the service range of a mine gravity-flow backfilling system. This method has advantages such as simple process, wide applicability, minimal modification work, and low system investment. Summary of the Invention

[0004] To address the technical challenges of limited service area in mine gravity-flow backfilling systems, high investment costs in converting them to pumping systems, and unusable backfilling pipelines, this invention provides a device and method for expanding the service area of ​​mine gravity-flow backfilling systems. This method offers advantages such as simple process, wide applicability, minimal modification work, and low system investment.

[0005] To achieve the above-mentioned technical objectives, the present invention provides an apparatus for expanding the service range of a mine gravity-flow backfilling system, comprising three parts: a diversion system, a dual-pumping system, and an accident handling system. The diversion system consists of a four-way elbow, a reducer, an emergency pipeline, and a shut-off valve. The four-way elbow is connected to the original horizontal gravity flow pipeline, two reducers, and one emergency pipeline. The diameter of the emergency pipeline should be the same as that of the original horizontal gravity flow pipeline, and the diameter of the reducer should be ≥1.5 times the diameter of the original horizontal gravity flow pipeline. Shut-off valves are installed in the middle of the two reducers and the emergency pipeline to control the flow rate. The dual pumping system consists of two sets of collection hoppers, a filling pump, and pumping pipelines: the collection hopper is a steel structure bin with a feed inlet and observation window at the top. The feed inlet is connected to the variable diameter pipeline, the bottom receives the inlet of the filling pump, and the side is provided with an overflow port. The inlet of the filling pump receives the collection hopper, and the outlet is connected to the horizontal pumping pipeline and the vertical pumping pipeline. The accident handling system consists of an accident pool, an overflow pipe, and an accident valve. The accident pool is located between the two filling pumps and receives the filling slurry overflowing from the hopper through the overflow port and overflow pipe. The accident valve is located at the end of the accident pipeline and can control the filling slurry to leak into the accident pool in the event of an accident.

[0006] This invention provides a method for expanding the service range of a mine gravity-flow backfilling system, using the aforementioned apparatus, and comprising the following steps: Step 1, Diversion and Buffering: Close the emergency valve and open the shut-off valve. The filling slurry flows through the vertical borehole, the horizontal gravity flow pipeline, and the four-way elbow into the variable diameter pipelines on both sides. After being buffered and slowed down by the variable diameter pipelines, it flows into the feed inlet of the collection hopper. Step 2, Pumping and Filling: The filling slurry flows into the filling pump through the collection hopper, and is pumped to the goaf for filling through the horizontal and vertical pumping pipelines. Step 3, Emergency Response: In the event of an accident, close the shut-off valve and open the emergency valve to discharge the filling slurry in the vertical borehole and horizontal gravity flow pipeline into the emergency pool.

[0007] The technical advantage of this invention lies in the fact that, through the diversion effect of the four-way elbow, a high degree of matching is achieved between the original gravity filling device and the subsequent dual pumping system in terms of flow rate, velocity, and pipe diameter; by utilizing the buffer adjustment of the variable diameter pipeline, the gravity filling slurry flows slowly into the filling pump hopper, ensuring a uniform and stable transition from gravity to pumping. It has the advantages of simple process, wide applicability, small amount of modification work, and low system investment. Attached Figure Description

[0008] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0009] Figure 1 This is a plan view of the apparatus and method of the present invention; Figure 2 This is a cross-sectional schematic diagram of the apparatus and method of the present invention; Figure 3 This is a cross-sectional schematic diagram of the accident handling system in the device and method of the present invention.

[0010] In the diagram: 1—Vertical gravity flow pipeline; 2—Horizontal gravity flow pipeline; 3—Four-way elbow; 4—Reducing diameter pipeline; 5—Stop valve; 6—Filling pump; 7—Collection hopper; 8—Inlet; 9—Observation window; 10—Outlet; 11—Horizontal pumping pipeline; 12—Vertical pumping pipeline; 13—Overflow port; 14—Overflow pipe; 15—Emergency pipeline; 16—Emergency valve; 17—Emergency pool. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this is not intended to limit the present invention in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0012] The present invention provides an apparatus for expanding the service range of a mine gravity-flow backfilling system, comprising three parts: a diversion system, a dual-pumping system, and an accident handling system. The diversion system consists of a four-way elbow 3, a reducer 4, an emergency conduit 15, and a shut-off valve 5. The four-way elbow 3 connects to the original horizontal gravity flow conduit 2, two reducers 4, and an emergency conduit 15. The diameter of the emergency conduit 15 should be the same as that of the original vertical gravity flow conduit 1 and the horizontal gravity flow conduit 2. The diameter of the reducer 4 should be ≥ 1.5 times the diameter of the original horizontal gravity flow conduit 2. Shut-off valves 5 are installed in the middle of the two reducers 4 and the emergency conduit 15 to control the flow rate. See [link / description]. Figure 1 ; The dual-pumping system consists of two sets of collection hoppers 7, a filling pump 6, and pumping pipelines. The collection hopper 7 is a steel structure bin with an inlet 8 and an observation window 9 at the top. The inlet 8 connects to a reducing pipe 4, and the lower part receives the inlet of the filling pump 6. An overflow port 13 is located on the side. The inlet of the filling pump 6 receives the collection hopper 7, and the outlet connects to a horizontal pumping pipeline 11 and a vertical pumping pipeline 12. (See attached diagram) Figure 2 ; The accident handling system consists of an accident pool 17, an overflow pipe 14, and an accident valve 16. The accident pool 17 is located between the two filling pumps 6, and receives the filling slurry overflowing from the collection hopper 7 through the overflow port 13 and the overflow pipe 14. The accident valve 16 is located at the end of the accident pipeline 15, and in the event of an accident, it can control the leakage of filling slurry into the accident pool 17. Figure 3 .

[0013] The present invention provides a method for expanding the service range of a mine gravity-flow backfilling system, employing the aforementioned apparatus, and comprising the following steps: Step 1, Diversion and Buffering: Close the emergency valve 16 and open the shut-off valve 5. The filling slurry flows through the vertical gravity flow pipe 1, the horizontal gravity flow pipe 2, and the four-way elbow 3, then flows into the reducing pipes 4 on both sides. After being buffered and slowed down by the reducing pipes 4, it flows into the feed inlet of the collection hopper. See Figure 1 ; Step 2, Pumping and Filling: The filling slurry flows into the filling pump through the collection hopper 7, and is then pumped to the goaf area for filling via the horizontal pumping pipeline 11 and the vertical pumping pipeline 12. See [link to details]. Figure 2 ; Step 3, Emergency Response: In the event of an accident, close the shut-off valve 5, open the emergency valve 16, and discharge the filling slurry from the vertical borehole and horizontal gravity-flow pipeline 2 into the emergency pool 17. (See...) Figure 3 .

[0014] With a capacity of 160m 3 Taking a self-flowing backfilling system with a filling slurry concentration of 72% as an example, it flows by gravity into the goaf through vertical boreholes and horizontal pipes, and can only serve areas with a filling multiple of 6 or less. The following describes the method of this invention to expand the service range of the self-flowing backfilling system.

[0015] First, select a suitable construction chamber underground, excavate an emergency pool inside the chamber, and install two pumps with a flow rate of 100m³ / h. 3 A filling pump with a pressure of 15MPa and a capacity of 1 / h, equipped with a four-way elbow with an inner diameter of 150mm, an emergency pipeline, a reducer with an inner diameter of 250mm, and a shut-off valve, etc. Secondly, after the equipment and system are successfully commissioned and operational, the emergency valve is closed and the shut-off valve is opened. The filling slurry flows through vertical boreholes, horizontal gravity-flow pipelines, and four-way elbows before being distributed into the reducing pipes on both sides. After the distribution, the flow rate into each reducing pipe is 80m³. 3 / h; Then, after being buffered and adjusted by the variable diameter pipe, the flow rate of the filling slurry can be reduced to 0.5 m / s, and then flow into the filling pump through the collection hopper, and pumped into the goaf area through the horizontal pumping pipeline and the vertical pumping pipeline. Finally, in the event of an emergency, close the shut-off valve and open the emergency valve to discharge the filling slurry from the vertical borehole and horizontal gravity flow pipeline into the emergency pool, which is 5m long, 2m wide and 1m high.

[0016] After the above modifications, the service area of ​​this mine's self-flowing backfilling system has increased by more than 2 times, covering areas with a backfilling multiple of 15 or less.

[0017] The above examples are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the methods and techniques disclosed above to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A device for expanding the service range of a mine self-flowing backfilling system, characterized in that, The device consists of three parts: a diversion system, a dual pumping system, and an emergency handling system. The diversion system consists of a four-way elbow, a reducing pipe, an emergency pipe, and a shut-off valve. The four-way elbow is connected to the original horizontal gravity flow pipe, two reducing pipes, and one emergency pipe. The diameter of the emergency pipe should be the same as that of the original horizontal gravity flow pipe, and the diameter of the reducing pipe should be ≥1.5 times the diameter of the original horizontal gravity flow pipe. Shut-off valves are installed in the middle of the two reducing pipes and the emergency pipe to control the flow rate. The dual pumping system consists of two sets of collection hoppers, a filling pump, and pumping pipelines: the collection hopper is a steel structure bin with a feed inlet and observation window at the top. The feed inlet is connected to the variable diameter pipeline, the bottom receives the inlet of the filling pump, and the side is provided with an overflow port. The inlet of the filling pump receives the collection hopper, and the outlet is connected to the horizontal pumping pipeline and the vertical pumping pipeline. The accident handling system consists of an accident pool, an overflow pipe, and an accident valve. The accident pool is located between the two filling pumps and receives the filling slurry overflowing from the hopper through the overflow port and overflow pipe. The accident valve is located at the end of the accident pipeline and can control the filling slurry to leak into the accident pool in the event of an accident.

2. A method for expanding the service range of a mine gravity-flow backfilling system, comprising the apparatus for expanding the service range of a mine gravity-flow backfilling system as described in claim 1, characterized in that, Includes the following steps: Step 1, Diversion and Buffering: Close the emergency valve and open the shut-off valve. The filling slurry flows through the vertical gravity flow pipeline, the horizontal gravity flow pipeline, and the four-way elbow before flowing into the variable diameter pipelines on both sides. After being buffered and slowed down by the variable diameter pipelines, it flows into the feed inlet of the collection hopper. Step 2, Pumping and Filling: The filling slurry flows into the filling pump through the collection hopper, and is pumped to the goaf for filling through the horizontal and vertical pumping pipelines. Step 3, Emergency Response: In the event of an accident, close the shut-off valve and open the emergency valve to discharge the filling slurry in the vertical gravity flow pipeline and the horizontal gravity flow pipeline into the emergency pool.

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