A gangue jet body high efficiency filling system and method

Abstract

The application discloses a gangue injection body high-efficiency filling system and method, and the system comprises an A ground feeding well, a B ground feeding well, an underground water tank, a quick-setting agent tank and an underground air compressor; the A ground feeding well is sequentially connected with an underground gangue bin, an A metering feeder and a feeder; the B ground feeding well is sequentially connected with an underground cementing material bin, a B metering feeder and the feeder; the underground water tank is sequentially connected with a variable-frequency water supply pump, an A flow meter and the feeder; the quick-setting agent tank is sequentially connected with a variable-frequency feeding pump and a B flow meter; the underground air compressor is sequentially connected with a gas storage tank and an air regulating valve; the feeder is sequentially connected with a continuous mixer, a filling industrial pump 12, a conveying pipeline and a support injector; the B flow meter is connected with the support injector; the air regulating valve is connected with the support injector; and the support injector is communicated with a to-be-filled area of a working face.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mining engineering, and particularly relates to a gangue jet body high-efficiency filling system and method. BACKGROUND

[0002] The longwall mining system is the main mining method of high-yield and high-efficiency mines. The traditional longwall working face filling mining of coal mines includes gangue paste filling and gangue solid filling. Both of the two methods need to use special hydraulic supports. The gangue paste filling changes the mining and preparation operation system of the longwall working face, increases the processes of support isolation sealing, paste filling behind the support, and paste solidification, and the coal mining and filling are not synchronous, the cycle operation period is long, which leads to high cost of paste filling mining, low yield and efficiency. The gangue solid filling is to make the crushed gangue solid body into the filling support, the tail beam and the gangue unloading mechanism of the support affect the filling body to top, the compression rate of the gangue solid body is large, the deformation control effect of the coal seam overburden and the surface subsidence is poor, in addition, the gangue solid filling needs to add the gangue transportation shaft engineering, and its popularization and application are limited. The existing filling methods have the disadvantages of high cost, low efficiency, narrow application range and yield bottleneck to different degrees. SUMMARY

[0003] The present application aims to overcome the problems of high cost, low efficiency and yield bottleneck of the traditional gangue filling, and provides a gangue jet body high-efficiency filling system and method.

[0004] In order to achieve the above-mentioned purpose, the technical scheme provided by the present application is as follows:

[0005] The gangue injection body high-efficiency filling system comprises an A ground feeding well (1), a B ground feeding well (4), an underground water tank (7), a quick-setting agent tank (14) and an underground air compressor (17); the A ground feeding well (1) is connected with an underground gangue bin (2), the underground gangue bin (2) is connected with an A metering feeder (3), and the A metering feeder (3) is connected with a feeder (10); the B ground feeding well (4) is connected with an underground cementing material bin (5), the underground cementing material bin (5) is connected with a B metering feeder (6), and the B metering feeder (6) is connected with the feeder (10); the underground water tank (7) is connected with a variable frequency water feeder pump (8), the variable frequency water feeder pump (8) is connected with an A flow meter (9), and the A flow meter (9) is connected with the feeder (10); the quick-setting agent tank (14) is connected with a variable frequency feeder pump (15), and the variable frequency feeder pump (15) is connected with a B flow meter (16); the underground air compressor (17) is connected with a gas storage tank (18), and the gas storage tank (18) is connected with an air regulating valve (19); the feeder (10) is connected with a continuous mixer (11), the continuous mixer (11) is connected with a filling industrial pump (12), the filling industrial pump (12) is connected with a conveying pipeline (13), and the conveying pipeline (13) is connected with a support injector (20); the B flow meter (16) is connected with the support injector (20); the air regulating valve (19) is connected with the support injector (20); and the support injector (20) is connected with a working face to be filled area (21).

[0006] The gangue injection body high-efficiency filling method based on the gangue injection body high-efficiency filling system comprises the following steps:

[0007] (1) The underground gangue bin and the underground cementing material bin are arranged near the intersection of the district transportation roadway and the district transportation upward slope in the underground mining area, and the bin bottom chamber is communicated with the district transportation upward slope; the crushed gangue powder is fed into the underground gangue bin by self-gravity through the ground feeding well; the cementing powder is fed into the underground cementing material bin by self-gravity through the ground feeding well; a through hole is reserved at the end of each hydraulic base of the longwall working face, and an adjustable support injector with a tilting angle is arranged in the through hole;

[0008] (2) Calculate the formula and raw material feeding capacity of the gangue jet body high efficient filling system, and according to the calculation results, A metering feeder continuously feeds the crushed gangue powder into the continuous mixer through the feeder, B metering feeder continuously feeds the cementing powder into the continuous mixer through the feeder, the frequency conversion water pump is closed loop controlled with the A flow meter, and the mine water is continuously fed into the continuous mixer through the feeder; the semi-finished product slurry stirred by the continuous mixer is pressurized by the filling industrial pump, and enters the input end of the support jet through the conveying pipeline; the frequency conversion feeding pump is closed loop controlled with the B flow meter, and the accelerator is continuously fed into the input end of the support jet; the air regulating valve adjusts the flow of the compressed air in the air tank and then enters the input end of the support jet; the support jet completes the mixing of the semi-finished product slurry and the accelerator under the guidance of the compressed air jet, and then sprays and outputs to form the jet body filling.

[0009] Preferably, step (2) is to calculate the formula and raw material feeding capacity of the gangue jet body high efficient filling system according to the following algorithm:

[0010] Formula calculation:

[0011]

[0012]

[0013] M T =K TC M c ;

[0014] Wherein, M g - calculated proportion of gangue powder, t / m 3 ; M C - set proportion of cementing material, t / m 3 ; M W - calculated proportion of water, t / m 3 ; M T - calculated proportion of accelerator, t / m 3 ; W g - water content of gangue powder, %; C m - mass concentration of paste, %; γ s - true density of gangue, t / m 3 ; γ C - true density of cementing material, t / m 3 ; γ w - true density of water, t / m 3 ; K TC - relative proportion of accelerator dosage, %;

[0015] Raw material feeding capacity:

[0016] Q g =Q P M g;

[0017] Q C = Q P M C ;

[0018] Q W = Q P M W ;

[0019]

[0020] wherein Q P - jet flow, m 3 / h; Q g - gangue powder feeding capacity, t / h; Q c - cementing material feeding capacity, t / h; Q w - water feeding capacity, t / h; Q T - accelerator feeding capacity, m 3 / h; γ T - accelerator true density, t / m 3 .

[0021] Preferably, the broken gangue powder has a maximum particle size of -20 mm, the semi-finished product slurry has a mass concentration ranging from 75 to 85%, the semi-finished product slurry has a pumpable time of 8 h, and the jet has an initial setting time of 5-30 min.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] 1. The gangue jet filling can adopt the existing longwall working face traditional hydraulic support, only a through hole is formed near the support base, the structure of the traditional support is not changed, the disadvantages of the overall configuration of special supports in the traditional gangue filling are avoided, the traditional support and the filling support are universal, and the investment of the working face filling equipment is reduced.

[0024] 2. The gangue jet filling is parallel to the underground coal mining shift, the rapid-setting gangue jet is adopted, the "machine-following operation" of the support following the coal mining machine and timely moving the support and the "support-following operation" of the filling following the forward movement of the support are realized, the filling does not affect the bidirectional cutter coal cutting and support moving at the upper and lower ends of the longwall working face, the defect that the gangue paste filling needs to be separately set for the solidification shift is eliminated, the mining and filling contradiction and the production capacity bottleneck problem of the traditional paste filling are solved.

[0025] 3. The gangue jetting body filling has higher concentration than paste body filling, and does not need to consider the limitation of self-leveling into the filling area on the slurry concentration, but only needs to meet the requirement of pressurized pipeline transportation, the quick-setting gangue jetting body has no flow diffusion phenomenon in the filling area, the jetting body has the feature of "adhesion forming", eliminates the work of isolating and sealing of the support before paste body filling, and reduces the side thrust of the hydraulic support by the flow slurry of paste body filling, so that the safe filling under the condition of low support strength can be realized, and the disadvantages of large support working resistance and high cost of traditional paste body filling are eliminated.

[0026] 4. The gangue jetting body uses the support following filling, the cutting coal step distance, the support moving step distance and the filling step distance are unified, the step distance is 0.8m every other cutting coal, the filling time of the coal mining shift is long, the space to be filled is small, the capacity configuration of the filling system equipment is reduced, the disadvantages of the traditional paste body filling requiring large system equipment configuration capacity due to "short time and large quantity" are eliminated, and the filling system equipment investment is small.

[0027] 5. The gangue jetting body filling adds the quick-setting agent at the end of the working face, on the one hand, the quick-setting agent addition amount is adjustable, and the different "support following filling" operation speeds are adapted; on the other hand, the semi-finished product slurry in the pipeline before entering the working face is not affected by the quick-setting agent, the pumpable time of the semi-finished product slurry is 8h, the "three mining and one extraction" or "two mining and one extraction" conventional coal mining production operation cycle system can realize the washing-free pipeline filling, and the disadvantages of the traditional paste body filling of multiple slurry switching and pipeline flushing are eliminated.

[0028] 6. The gangue jetting body filling is provided with the support jetting device of each hydraulic support, the jetting body is actively topped and filled by adjusting the jetting elevation and depression angle, and the disadvantages of the traditional paste body filling and solid filling of difficult active topping are eliminated. In addition, the filling step distance is the same as the support moving step distance and is only 0.8m, the movement distance of the jetting body is short, the process kinetic energy loss is small, the jetting body is attached, accumulated and dense, and the filling effect is good.

[0029] 7. The underground silo is arranged, the ground feeding is facilitated, the station is built underground near the working face, and the hidden danger of pipe blockage caused by the ground station drilling and slurry feeding of the traditional paste body filling is eliminated.

[0030] In summary, the application provides a gangue jetting body efficient filling system and method, the filling station is built underground near the working face, the conventional support type is used in the working face, the support jetting device is arranged in the through hole of the base, and the quick-setting agent is added at the end. The longwall working face mining and filling are synchronously performed, the support follows the machine operation, the filling follows the support operation, the jetting body concentration is high, the jetting body is attached and formed, the active topping effect is good, the washing-free pipeline filling can be realized, the separate procedures such as isolation, sealing and solidification of the traditional paste body filling are eliminated, the equipment investment and energy consumption are reduced, and the system efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1Structure diagram of gangue injection body high-efficiency filling system.

[0032] In the figure: 1, A ground feeding well; 2, underground gangue warehouse; 3, A metering feeder; 4, B ground feeding well; 5, underground cementing material warehouse; 6, B metering feeder; 7, underground water tank; 8, variable frequency water pump; 9, A flow meter; 10, feeder; 11, continuous mixer; 12, filling industrial pump; 13, conveying pipeline; 14, accelerator tank; 15, variable frequency feeding pump; 16, B flow meter; 17, underground air compressor; 18, gas storage tank; 19, air regulating valve; 20, support injector; 21, working face to be filled area. DETAILED DESCRIPTION

[0033] Example 1

[0034] Reference Figure 1 The gangue injection body high-efficiency filling system comprises A ground feeding well 1, B ground feeding well 4, underground water tank 7, accelerator tank 14 and underground air compressor 17; the A ground feeding well 1 is connected with the underground gangue warehouse 2, the underground gangue warehouse 2 is connected with the A metering feeder 3, the A metering feeder 3 is connected with the feeder 10; the B ground feeding well 4 is connected with the underground cementing material warehouse 5, the underground cementing material warehouse 5 is connected with the B metering feeder 6, the B metering feeder 6 is connected with the feeder 10; the underground water tank 7 is connected with the variable frequency water pump 8, the variable frequency water pump 8 is connected with the A flow meter 9, the A flow meter 9 is connected with the feeder 10; the accelerator tank 14 is connected with the variable frequency feeding pump 15, the variable frequency feeding pump 15 is connected with the B flow meter 16; the underground air compressor 17 is connected with the gas storage tank 18, the gas storage tank 18 is connected with the air regulating valve 19; the feeder 10 is connected with the continuous mixer 11, the continuous mixer 11 is connected with the filling industrial pump 12, the filling industrial pump 12 is connected with the conveying pipeline 13, the conveying pipeline 13 is connected with the support injector 20; the B flow meter 16 is connected with the support injector 20; the air regulating valve 19 is connected with the support injector 20; the support injector 20 is communicated with the working face to be filled area 21.

[0035] Example 2

[0036] The gangue injection body high-efficiency filling method based on the gangue injection body high-efficiency filling system of example 1 comprises the following steps:

[0037] (1) The underground gangue warehouse and the underground cementing material warehouse are arranged near the intersection of the district transportation roadway and the district transportation uphole, and the warehouse bottom chamber is communicated with the district transportation uphole; the crushed gangue is dropped into the underground gangue warehouse by gravity through the ground feeding well; the cementing powder is dropped into the underground cementing material warehouse by gravity through the ground feeding well; a through hole is reserved at the end of each hydraulic support of the longwall working face, and an adjustable support injector with a tilting angle is arranged in the through hole;

[0038] (2) Calculate the formula and raw material feeding capacity of the high-efficiency backfilling system for gangue spraying according to the following algorithm:

[0039] Formula calculation:

[0040]

[0041]

[0042] M T =K TC M c ;

[0043] Among them, M g - Calculated mix proportion of gangue powder, t / m³ 3 M C - Binder setting ratio, t / m 3 M W - Water calculation ratio, t / m 3 M T - Calculated proportion of quick-setting agent, t / m 3 W g - Moisture content of gangue powder, %; C m -Ointment mass concentration, %; γ s -True density of gangue, t / m³ 3 ;γ C -True density of binder, t / m³ 3 ;γ w - True density of water, t / m³ 3 ;K TC -Relative proportion of quick-setting agent dosage, %;

[0044] Raw material feeding capacity:

[0045] Q g =Q P M g ;

[0046] Q C =Q P M C ;

[0047] Q W =Q P M W ;

[0048]

[0049] Among them, Q P - Jet flow rate, m 3 / h;Q g - Gangue powder feeding capacity, t / h; Q c- Binder feeding capacity, t / h; Q w -Water feeding capacity, t / h; Q T -Accelerating agent feeding capacity, m 3 / h;γ T - True density of accelerator, t / m³ 3 ;

[0050] Based on the above calculations, metering feeder A continuously meteres and feeds crushed gangue powder into the continuous mixer via a feeder, while metering feeder B continuously meteres and feeds cementitious powder into the continuous mixer via a feeder. A variable frequency water pump, under closed-loop control with flow meter A, continuously meteres and feeds mine water into the continuous mixer via a feeder. The semi-finished slurry mixed in the continuous mixer is pressurized by a filling industrial pump and enters the input end of the support injector through a conveying pipeline. A variable frequency feed pump, under closed-loop control with flow meter B, continuously meteres and feeds the accelerator into the input end of the support injector. An air regulating valve adjusts the flow rate of compressed air from the air tank before it enters the input end of the support injector. Guided by the compressed air jet, the support injector completes the mixing of the semi-finished slurry and the accelerator, and then sprays it out, forming a filling jet.

[0051] The maximum particle size of the crushed gangue powder is -20mm, the mass concentration of the semi-finished slurry is 75-85%, the pumpable time of the semi-finished slurry is 8h, and the initial setting time of the sprayed body is 5-30min.

Claims

1. A method for efficient filling of gangue sprayed material in a gangue sprayed material efficient filling system, characterized in that, The method is performed in the high-efficiency backfilling system for jetting gangue as described below: The efficient filling system for the ejected gangue includes an A surface feeding well (1), a B surface feeding well (4), an underground water tank (7), a quick-setting agent tank (14), and an underground air compressor (17). The A surface feeding well (1) is connected to the underground gangue bin (2), the underground gangue bin (2) is connected to the A metering feeder (3), and the A metering feeder (3) is connected to the feeder (10). The B surface feeding well (4) is connected to the underground cementing silo (5), the underground cementing silo (5) is connected to the B metering feeder (6), and the B metering feeder (6) is connected to the feeder (10). The underground water tank (7) is connected to a variable frequency water pump (8), the variable frequency water pump (8) is connected to an A flow meter (9), and the A flow meter (9) is connected to the feeder. (10) Connection; The quick-setting agent tank (14) is connected to the variable frequency feed pump (15), and the variable frequency feed pump (15) is connected to the B flow meter (16); The underground air compressor (17) is connected to the gas storage tank (18), and the gas storage tank (18) is connected to the air regulating valve (19); The feeder (10) is connected to the continuous mixer (11), the continuous mixer (11) is connected to the filling industrial pump (12), the filling industrial pump (12) is connected to the conveying pipeline (13), and the conveying pipeline (13) is connected to the support injector (20); The B flow meter (16) is connected to the support injector (20); The air regulating valve (19) is connected to the support injector (20); The support injector (20) is connected to the working face waiting area (21); The method includes the following steps: (1) The underground gangue bin and the underground cementitious material bin are located near the intersection of the underground mining area transport uphill and the section transport level roadway, and share the bottom chamber of the bin to connect with the mining area transport uphill; crushed gangue powder is fed into the underground gangue bin by gravity through the surface feeding well; cementitious powder is fed into the underground cementitious material bin by gravity through the surface feeding well; each hydraulic base of the longwall working face has a reserved through hole at the end, and an adjustable pitch angle bracket injector is installed in the hole; (2) Calculate the formula and raw material feeding capacity of the high-efficiency filling system for gangue spraying. Based on the calculation results, metering feeder A continuously meteres and feeds crushed gangue powder into the continuous mixer via the feeder. Metering feeder B continuously meteres and feeds cement powder into the continuous mixer via the feeder. The variable frequency water pump and flow meter A are in closed-loop control to continuously meter and feed mine water into the continuous mixer via the feeder. The semi-finished slurry mixed by the continuous mixer is pressurized by the filling industrial pump and enters the input end of the support sprayer through the conveying pipeline. The variable frequency feed pump and flow meter B are in closed-loop control to continuously meter and feed the accelerator into the input end of the support sprayer. The air regulating valve adjusts the flow rate of the compressed air in the air storage tank and then enters the input end of the support sprayer. Under the guidance of the compressed air jet, the support sprayer completes the mixing of the semi-finished slurry and the accelerator and sprays it out to form spraying filling.

2. The method as described in claim 1, characterized in that, Step (2) involves calculating the formula and raw material feeding capacity of the high-efficiency backfilling system for gangue spraying according to the following algorithm: Formula calculation: M T =K TC M c ; Among them, M g - Calculated mix proportion of gangue powder, t / m³ 3 M C - Binder setting ratio, t / m 3 M W -Water calculation ratio, t / m 3 M T - Calculated proportion of quick-setting agent, t / m 3 W g - Moisture content of gangue powder, %; C m -Ointment mass concentration, %; γ s - True density of gangue, t / m³ 3 ;γ C - True density of binder, t / m 3 ;γ w - True density of water, t / m 3 ;K TC -Relative proportion of quick-setting agent dosage, %; Raw material feeding capacity: Q g =Q P M g ; Q C =Q P M C ; Q W =Q P M W ; Among them, Q P - Jet flow rate, m 3 / h;Q g - Gangue powder feeding capacity, t / h; Q c - Binder feeding capacity, t / h; Q w -Water feeding capacity, t / h; Q T -Accelerating agent feeding capacity, m 3 / h;γ T - True density of accelerator, t / m 3 .

3. The method as described in claim 1 or 2, characterized in that, The maximum particle size of the crushed gangue powder is -20mm, the mass concentration of the semi-finished slurry ranges from 75% to 85%, the pumpable time of the semi-finished slurry is 8 hours, and the initial setting time of the sprayed material is 5 to 30 minutes.

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