Non-cementation slurry long-distance conveying anti-blocking system and anti-blocking method

Abstract

The non-cementation slurry long-distance conveying anti-blocking system comprises on-way on-line monitoring units arranged at all key positions easy to block of a long-distance conveying pipeline, and the key positions easy to block comprise a pipeline slope change point, a pipeline turning position and a position where the continuous stroke of slurry of a horizontal straight pipe section is 900-1000 m. And a pressurizing anti-blocking unit is arranged 25-35 m behind each easily-blocked key position. By arranging the on-way on-line monitoring unit, the flow state of slurry in a conveying pipeline can be mastered in real time, the symptom of pipe blockage can be found in time, when the concentration, pressure or flow fluctuates in a large range, the pressurization anti-blocking unit is used for carrying out flow field intervention at a key position, the flow state of the pipeline slurry is adjusted in time, and the pipeline blockage is prevented. And pipe blocking accidents caused by flow reduction, insufficient pressure or overhigh concentration are prevented, and the reliability of long-distance slurry pipeline conveying and the stability of operation of a coal gangue slurry filling system are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of non-cementitious slurry filling in coal mines, and in particular relates to a non-cementitious slurry long-distance transportation anti-blocking system. The invention also relates to a non-cementitious slurry long-distance transportation anti-blocking method. Background Art

[0002] In recent years, as the problem of coal-based solid waste emissions has become increasingly prominent, coal companies have gradually increased their attention to gangue filling technology. Gangue slurry filling as a gangue treatment method has been continuously accepted by mining companies due to its low production interference and low treatment cost.

[0003] With the large-scale promotion and application of slurry filling technology in the field of comprehensive utilization of coal gangue, the slurry pipeline transportation distance involved in slurry filling has gradually increased, especially at the mining boundary of large mines, where the slurry transportation distance may reach 10 to 20 km. Under the condition of long-distance transportation, the pipeline is generally buried. When the pipeline is blocked due to sudden situations such as uneven slurry mixing or too low transportation flow rate, it is difficult to handle the blockage accident of the buried pipeline. Therefore, the long-distance transportation of non-cemented slurry filling of coal gangue urgently needs to seek a long-distance transportation anti-blocking system and method to increase the stability of the filling system operation, increase the filling capacity and improve the slurry filling technology system. Summary of the invention

[0004] The purpose of the present invention is to provide a non-cementitious slurry long-distance transportation anti-blocking system, which solves the problem that the existing long-distance transportation pipeline blockage accident is difficult to handle.

[0005] Another object of the present invention is to provide a method for preventing blockage in long-distance transportation of non-cementitious slurry.

[0006] The first technical solution adopted by the present invention is: a non-cemented slurry long-distance transportation anti-blocking system, including online monitoring units along the long-distance transportation pipeline arranged at key positions prone to blockage. The key positions prone to blockage include the points where the pipeline slope changes, the pipeline bends, and the horizontal straight pipe sections where the slurry has a continuous travel distance of 900 to 1000 meters. A booster anti-blocking unit is arranged 25 to 35 meters behind each key position prone to blockage.

[0007] The first technical solution of the present invention is also characterized in that: The online monitoring units along the pipeline include pressure transmitters, concentration meters and flow meters extended into the long-distance transmission pipeline. Two groups of online monitoring units are arranged at each pipeline slope change point or pipeline bend, and are distributed within 10 to 20 meters before and after the pipeline slope change point or pipeline bend.

[0008] The pressure transmitter, concentration meter and flow meter are all connected to a control system located in the mine dispatching room through a data transmission line.

[0009] The boost and anti-blockage unit includes a controllable boost pump, which is connected to a two-position three-way solenoid valve. The outlet end of the two-position three-way solenoid valve is connected to a long-distance delivery pipeline through a pipeline via a check valve, and the inlet end of the two-position three-way solenoid valve is connected to a water storage tank and a thickener buffer box through pipelines. A flow solenoid valve is arranged on the connecting pipeline between the thickener buffer box and the two-position three-way solenoid valve.

[0010] The water storage tank is also connected to the long-distance delivery pipeline through a pipeline. A water replenishment solenoid valve is provided on the connecting pipeline between the long-distance delivery pipeline and the water storage tank. The controllable booster pump, water replenishment solenoid valve and flow solenoid valve are connected to the control system through radio signals.

[0011] The second technical solution adopted by the present invention is: an anti-blocking method for a non-cemented slurry long-distance transportation anti-blocking system, when the online monitoring unit of a key position prone to blockage detects that the slurry pressure or flow rate is lower than 10% of the lower limit of the set threshold range, or the slurry concentration exceeds 5% of the upper limit of the set threshold range, the control system starts the controllable booster pump of the booster anti-blocking unit behind the key position prone to blockage, and pumps the clean water in the water storage tank into the long-distance transportation pipeline, the pumping flow is 3% to 5% of the total transportation flow of the long-distance transportation pipeline, and the pumping time is 10 to 15s; or, when the online monitoring unit of a key position prone to blockage detects that the slurry concentration is lower than 5% of the lower limit of the set threshold range, the control system starts the controllable booster pump and flow solenoid valve of the booster anti-blocking unit behind the key position prone to blockage, and pumps the slurry thickener in the thickener buffer box into the long-distance transportation pipeline, the pumping flow is 0.1% to 0.3% of the total transportation flow of the long-distance transportation pipeline, and the pumping time is 10 to 15s.

[0012] The second technical solution of the present invention is also characterized in that: After the non-cementitious slurry transportation work is completed on the day, the control system opens the water replenishment solenoid valve and uses the water from the long-distance transportation pipeline to restore the rated water level of the water storage tank.

[0013] The beneficial effects of the present invention are as follows: the non-cemented slurry long-distance transportation anti-blocking system and anti-blocking method of the present invention can grasp the flow state of the slurry in the transportation pipeline in real time by setting an online monitoring unit along the way, and promptly discover signs of pipe blockage. When the concentration, pressure or flow rate fluctuates over a large range, the pressurization anti-blocking unit is used to intervene in the flow field at a key position, and the flow state of the pipeline slurry is adjusted in time to prevent pipe blockage accidents caused by reduced flow, insufficient pressure or excessive concentration, thereby ensuring the reliability of long-distance slurry pipeline transportation and the stability of the operation of the coal gangue slurry filling system, thereby realizing long-term, efficient and stable transportation in long-distance pipelines, effectively saving manpower and material resources, and reducing a large number of maintenance projects caused by pipe blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the non-cementitious slurry long-distance transportation and anti-blocking system of the present invention; Figure 2 yes Figure 1 A partial enlarged schematic diagram of area A of the non-cementitious slurry long-distance transportation and anti-blocking system of the present invention.

[0015] In the figure, 1. pressure transmitter, 2. concentration meter, 3. flow meter, 4. controllable booster pump, 5. check valve, 6. water storage tank, 7. water replenishment solenoid valve, 8. thickener buffer box, 9. flow solenoid valve, 10. data transmission line, 11. long-distance transmission pipeline, 12. mine dispatch room, 13. filling position. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Example 1 The present invention provides a non-cementitious slurry long-distance transportation anti-blocking system, such as Figure 1 and Figure 2 As shown, it includes online monitoring units arranged along the long-distance transmission pipeline 11 at various key locations prone to blockage. The key locations prone to blockage include points where the pipeline slope changes, pipeline bends, and positions where the slurry continuously travels in the horizontal straight pipe section at 900 to 1000 meters. A booster anti-blocking unit is arranged 25 to 35 meters behind each key location prone to blockage.

[0018] The online monitoring unit along the way includes a pressure transmitter 1, a concentration meter 2 and a flow meter 3 extending into the long-distance conveying pipeline 11. To facilitate the return of monitoring data, the pressure transmitter 1, the concentration meter 2 and the flow meter 3 are all connected to a control system located in the mine dispatching room 12 through a data transmission line 10. In order to expand the monitoring range of the position where the slurry conveying state is prone to sudden changes and improve the monitoring sensitivity, a group of online monitoring units along the way is arranged within 10 to 20 meters on both sides of each pipeline slope change point or pipeline bend. Each group of online monitoring units along the way includes a pressure transmitter 1, a concentration meter 2 and a flow meter 3; a group of online monitoring units along the way can be arranged at a position of 900 to 1000 meters for the continuous travel of the slurry in the horizontal straight pipe section.

[0019] The boosting and anti-blocking unit includes a controllable boosting pump 4, which is connected to the control system through radio signals to realize the start and stop of the controllable boosting pump 4. The controllable boosting pump 4 is connected to a two-position three-way solenoid valve, and the outlet end of the two-position three-way solenoid valve is connected to a long-distance delivery pipeline 11 through a pipeline via a check valve 5. The inlet end of the two-position three-way solenoid valve is respectively connected to a water storage tank 6 and a thickener buffer box 8 through pipelines. A flow solenoid valve 9 connected to the control system through radio signals is arranged on the connecting pipeline between the thickener buffer box 8 and the two-position three-way solenoid valve. The two-position three-way solenoid valve controls the controllable boosting pump 4 to be connected to one of the water storage tank 6 or the thickener buffer box 8. The controllable boosting pump 4 When connected to the water storage tank 6, the clean water in the water storage tank 6 is pumped into the long-distance delivery pipeline 11. When the controllable booster pump 4 is connected to the thickener buffer box 8, the slurry thickener in the thickener buffer box 8 is pumped into the long-distance delivery pipeline 11. At this time, the flow solenoid valve 9 provides further flow fine-tuning of the thickener; the water storage tank 6 is also connected to the long-distance delivery pipeline 11 through a pipeline. The connecting pipeline between the long-distance delivery pipeline 11 and the water storage tank 6 is provided with a water replenishment solenoid valve 7 connected to the control system through a radio signal. After the non-cementitious slurry delivery work is completed on the day, the control system opens the water replenishment solenoid valve 7 and uses the water flushing the long-distance delivery pipeline 11 to restore the rated water level of the water storage tank 6.

[0020] Example 2 The present invention provides a method for preventing non-cementitious slurry from being blocked during long-distance transportation. When an online monitoring unit at a key position prone to blocking detects that the slurry pressure or flow rate is lower than 10% of the lower limit of a set threshold range, or the slurry concentration exceeds 5% of the upper limit of the set threshold range, if the key position prone to blocking is a pipeline slope change point or a pipeline bend, then if the pressure or flow rate on either side of the corresponding position is lower than 10% of the lower limit of the set threshold range, or the slurry concentration exceeds 5% of the upper limit of the set threshold range, the control system starts the controllable booster pump 4 of the booster anti-blocking unit behind the key position prone to blocking. The start judgment condition, that is, the above-mentioned pressure, flow rate or concentration sensor parameter range is a predictive setting. When the above-mentioned judgment conditions are met, the long-distance conveying pipeline 11 is not actually blocked, and the sensor obtains the slurry parameters of the previous moment. The slurry has flowed backward with the long-distance conveying pipeline 11 at the next moment. Therefore, the controllable booster pump 4 at the rear is started to pump the clean water in the water storage tank 6 into the long-distance conveying pipeline 11. The pumping flow rate is 3% to 5% of the total conveying flow rate of the long-distance conveying pipeline 11, and the pumping time is 10 to 15 seconds, thereby reducing the blockage probability of the slurry flowing through the key position prone to blockage.

[0021] In order to adjust the stability of the slurry and prevent precipitation due to too low concentration, when the online monitoring unit at a key position prone to blockage detects that the slurry concentration is lower than 5% of the lower limit of the set threshold range, the control system starts the controllable boost pump 4 and flow solenoid valve 9 of the boost and anti-blocking unit behind the key position prone to blockage, and pumps the slurry thickener in the thickener buffer box 8 into the long-distance conveying pipeline 11. The pumping flow rate is 0.1% to 0.3% of the total conveying flow rate of the long-distance conveying pipeline 11, and the pumping time is 10 to 15 seconds.

[0022] Example 3 In order to deal with coal gangue solid waste, a newly built mine established a pulping station near the mouth of the auxiliary inclined shaft, and transported the coal gangue slurry to the underground filling position through the auxiliary inclined shaft through a pipeline to fill the goaf. The pipeline laying route is the ground pulping station → auxiliary inclined shaft → return air tunnel → working face auxiliary transportation chute → underground adjacent grouting filling position, where the slurry transportation state in the pipeline is horizontal section straight pipe (800m) → downward inclined section straight pipe (600m) → horizontal section straight pipe (1000m) → horizontal section curved pipe → horizontal section straight pipe (2000m) → upward inclined section straight pipe (600m) → filling position.

[0023] like Figure 1 and Figure 2 As shown in the figure, the slurry long-distance transportation pipeline 11 is a horizontal straight pipe before position I, and enters the inclined downward straight pipe after position I due to the increase in the pipeline slope during laying along the inclined shaft; before position II, it is an inclined downward straight pipe, and after position II, due to the end of the inclined shaft laying section, the pipeline slope decreases and enters the horizontal straight pipe; in the main tunnel, it enters a horizontal straight pipe with a length of 3 km, of which a horizontal elbow (Ⅲ) is arranged at 1 km due to the change in the direction of the main tunnel, and after the 3 km horizontal straight pipe ends, it enters the working face drift; due to the change in the roadway slope, it enters a 600 m upward inclined straight pipe, and finally connects to the filling position 13. The key positions prone to blockage in the entire pipeline laying section are: the starting position I of the pipeline downhill section, the ending position II of the pipeline downhill section (the starting position of the pipeline horizontal section), the position II' where there is no controllable booster pump within nearly 1 km without sudden changes in the slurry transportation state, the pipeline turning position III, the ending position IV of the pipeline horizontal section (the starting position of the pipeline uphill section), and the ending position V of the pipeline uphill section, a total of 6 key positions prone to blockage. Therefore, boosting and anti-blocking units are arranged at six key locations prone to blockage.

[0024] During the operation of the gangue slurry filling system, the pressure transmitter 1, the concentration meter 2, and the flow meter 3 in the online monitoring unit along the process monitor the pressure, concentration, and flow in the pipeline in real time, and summarize the monitoring results to the control system of the mine dispatching room 12 through the data transmission line 10. When the pressure and flow rate are lower than the lower limit of the threshold range by 10% or the concentration exceeds the upper limit of the threshold range by 5%, the nearest boosting and anti-blocking unit behind the over-limit position is started, and the clean water in the water storage tank 6 is pumped into the slurry long-distance conveying pipeline 11 through the check valve 5 at high pressure by the controllable boosting pump 4. The injection flow rate is 5% of the total conveying flow rate of the slurry pipeline, and the working time of each boosting and anti-blocking unit is 10s; when the concentration is lower than the lower limit of the threshold range by 5%, the nearest boosting and anti-blocking unit behind the over-limit position is started, and the flow solenoid valve 9 is opened to inject the magnesium aluminum silicate solution in the thickener buffer box 8 into the slurry long-distance conveying pipeline 11 by the controllable boosting pump 4. The amount of thickener injected each time is 0.3% of the total conveying flow rate of the slurry pipeline, and the working time of each boosting and anti-blocking system is 10s.

[0025] After the slurry filling work is completed on the day, the pipeline is flushed, the water replenishment solenoid valve 7 is opened by remote control, and the rated water level of the water storage tank 6 is restored by the water used to flush the pipeline.

Claims

1. Non-cemented slurry long-distance transportation anti-blocking system, characterized by: The system comprises online monitoring units arranged along the long-distance transmission pipeline (11) at key locations prone to blockage. The key locations prone to blockage include points where the pipeline slope changes, pipeline bends, and locations where the slurry continuously travels between 900 and 1000 m in a horizontal straight pipe section. A pressurization anti-blocking unit is arranged 25 to 35 m behind each key location prone to blockage.

2. The non-cementitious slurry long-distance transportation anti-blocking system according to claim 1 is characterized in that: The online monitoring unit comprises a pressure transmitter (1), a concentration meter (2) and a flow meter (3) extending into a long-distance transmission pipeline (11), wherein two groups of online monitoring units are arranged at each pipeline slope change point or pipeline bend, and are distributed within 10 to 20 m before and after the pipeline slope change point or pipeline bend.

3. The non-cementitious slurry long-distance transportation anti-blocking system according to claim 2 is characterized in that: The pressure transmitter (1), the concentration meter (2) and the flow meter (3) are all connected to a control system located in a mine dispatching room (12) via a data transmission line (10).

4. The non-cementitious slurry long-distance transportation anti-blocking system according to claim 3 is characterized in that: The boosting and anti-blocking unit comprises a controllable boosting pump (4), the controllable boosting pump (4) is connected to a two-position three-way solenoid valve, the outlet end of the two-position three-way solenoid valve is connected to a long-distance delivery pipeline (11) through a pipeline via a check valve (5), the inlet end of the two-position three-way solenoid valve is connected to a water storage tank (6) and a thickener buffer box (8) through pipelines, respectively, and a flow solenoid valve (9) is provided on the connecting pipeline between the thickener buffer box (8) and the two-position three-way solenoid valve.

5. The non-cementitious slurry long-distance transportation anti-blocking system according to claim 4, characterized in that: The water storage tank (6) is also connected to the long-distance transport pipeline (11) through a pipeline. A water replenishment solenoid valve (7) is provided on the connecting pipeline between the long-distance transport pipeline (11) and the water storage tank (6). The controllable booster pump (4), the water replenishment solenoid valve (7) and the flow solenoid valve (9) are connected to the control system through radio signals.

6. The anti-blocking method of the non-cementitious slurry long-distance transportation anti-blocking system according to claim 1, characterized in that: When the online monitoring unit at a key location prone to blockage detects that the slurry pressure or flow rate is lower than 10% of the lower limit of the set threshold range, or the slurry concentration exceeds 5% of the upper limit of the set threshold range, the control system starts the controllable booster pump (4) of the booster anti-blocking unit behind the key location prone to blockage, and pumps the clean water in the water storage tank (6) into the long-distance transmission pipeline (11). The pumping flow rate is 3% to 5% of the total transmission flow rate of the long-distance transmission pipeline (11), and the pumping time is 10 to 15 seconds.

7. The anti-blocking method of the non-cementitious slurry long-distance transportation anti-blocking system according to claim 6, characterized in that: After the non-cementitious slurry delivery work is completed on the day, the control system opens the water replenishment solenoid valve (7) and uses the water from the long-distance delivery pipeline (11) to restore the rated water level of the water storage tank (6).

8. The anti-blocking method of the non-cementitious slurry long-distance transportation anti-blocking system according to claim 1, characterized in that: When the online monitoring unit at a key location prone to blockage detects that the slurry concentration is lower than 5% of the lower limit of the set threshold range, the control system starts the controllable booster pump (4) and flow solenoid valve (9) of the booster anti-blocking unit behind the key location prone to blockage, and pumps the slurry thickener in the thickener buffer box (8) into the long-distance conveying pipeline (11). The pumping flow rate is 0.1% to 0.3% of the total conveying flow rate of the long-distance conveying pipeline (11), and the pumping time is 10 to 15 seconds.

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