Paste filling staggered distance fully mechanized coal mining method

Abstract

The present application provides a paste filling staggered distance fully mechanized coal mining method, which comprises the following steps: A, dividing the coal mining face into two sections, i.e., section A and section B, which do not affect each other in advancing, and setting up independent paste filling fully mechanized mining equipment for the two sections according to the fully mechanized rear paste filling coal mining process, and implementing coal mining-filling alternating stage operation for the two sections; B, first performing coal mining operation for section A, and waiting for section B to stagger two or more cycle steps; C, after section A is mined to a specified step distance, performing paste filling in the mined-out area of section A, and performing coal mining operation for section B, and the mining step distance is the cycle step distance; D, waiting for the paste filling in the mined-out area of section A to solidify to a strength that meets the mining condition, and after section B is mined to a set cycle step distance, stopping the coal mining, and performing paste filling in the mined-out area of section B; E, performing next cycle mining operation for section A, and waiting for the paste filling in the mined-out area of section B to solidify to a strength that meets the mining condition.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal mining, and relates to a paste filling coal mining method, in particular to a paste filling staggered distance fully mechanized coal mining method. BACKGROUND

[0002] The "three-under-one-over" coal mining refers to coal mining under buildings, under railways, under water bodies and over bearing water bodies. The filling mining is an important part of the green mining technology system of coal mines and is the core technology with the most promising development for solving the "three-under" coal mining. The filling mining can effectively alleviate the limited mining of mine resources and improve the recovery rate of coal resources. Generally, the paste filling mining can be divided into two methods: one is the fully mechanized longwall paste filling mining method, and the other is the strip paste filling mining method. In the actual application process of the fully mechanized longwall paste filling mining method, the fully mechanized paste filling working face needs to be moved and turned over, which is low in efficiency. Meanwhile, the method is performed according to the procedures of cutting coal first, surrounding next, filling later and waiting for solidification, the coal mining and the filling of the traditional fully mechanized paste filling working face are in the same working face, the coal mining and the filling solidification are mutually restricted, and there are technical problems of great difficulty in processing the coal mining and the filling and solidification, low mining starting rate and low mining efficiency. SUMMARY

[0003] The present application aims to provide a paste filling staggered distance fully mechanized coal mining method to solve the technical problems of mutual restriction between the coal mining and the filling solidification, low mining starting rate and low mining efficiency in the prior art.

[0004] To achieve the above-mentioned purpose, the specific technical solutions of the present application are as follows:

[0005] A paste filling staggered distance fully mechanized coal mining method, the steps of which include:

[0006] A, the coal mining working face is divided into two sections, i.e. section A and section B, which do not affect each other in advancing, and independent fully mechanized paste filling mining equipment is arranged for the two sections according to the fully mechanized frame rear paste filling coal mining process, and the section A and the section B implement the coal mining-filling alternating type stage operation;

[0007] B, the section A first performs the coal mining operation, and the section B waits for two or more than two cycle step distances to be staggered;

[0008] C, after the section A is mined to a specified step distance, the section A goaf is filled with the paste, the section B performs the coal mining operation, and the mining step distance is the cycle step distance;

[0009] D, after the paste in the section A goaf is filled and solidified to a strength that meets the mining condition, the section B is mined to a set cycle step distance, the coal mining is stopped, and the section B goaf is filled with the paste;

[0010] E, the section A carries out mining operation, and the section B waits for the filling of the goaf to solidify to the strength meeting the mining condition;

[0011] F, the cycle steps C, D, E to the mining of the complete section coal seam.

[0012] The alternating stage operation in the step A adopts a three-eight operation mode, that is, one day is divided into three eight hours, and the mining, filling and solidification of the section A and the section B are carried out in eight hours.

[0013] The cycle step distance in the step B and the step C ranges from 1.5m to 3.4m.

[0014] In the step A, the section A is provided with a 90° turning scraper conveyor A, the rear end of the scraper conveyor A is turned into the intermediate roadway between the section A and the section B to the end of the section B, and the section B is provided with a scraper conveyor B which is overlapped with the scraper conveyor A.

[0015] The step A further comprises a filling station and a working face preparation stage.

[0016] The gangue is prepared as filling aggregate and powder, is stored in a finished gangue yard warehouse, the fly ash and the cementing material are stored in a special silo, sufficient amount of required water and external additive are prepared, the power supply, water supply and air supply systems are checked, the equipment trial operation is confirmed to be normal, and the underground pipeline, control valve, distribution device and filling bag are confirmed to be reliable.

[0017] The step C and the step D further comprise a filling station and a working face formal filling stage.

[0018] During the filling, the aggregate in the finished gangue yard warehouse is discharged to an aggregate metering mechanism, is conveyed to a paste proportioning and stirring system through a belt conveyor after metering, and

[0019] The fly ash and the cementing material pre-stored in the special silo, the water and the external additive are conveyed to the paste proportioning and stirring system after metering, are mixed and stirred with the aggregate to form filling paste, are conveyed to the goaf of the working face along the pipeline by a filling pump, and are filled according to the alternating distribution principle.

[0020] After the completion of the paste filling in the step C and the step D and before the shift to the next working face operation, the safety of the conveying pipeline and the slurry state are checked, the filling station facilities are overhauled and cleaned, the ground of the filling station is cleaned, and the residual sundries in the slurry storage pool are cleaned.

[0021] The beneficial effect of the present application is that: the present application provides a paste filling staggered distance fully mechanized coal mining method, by dividing the whole coal mining working face into two sections, namely, section A and section B, the mining and filling process is composed of two systems, namely, a coal mining system and a filling system, wherein the filling (i.e. paste filling) includes three procedures of support filling, filling and solidification, the two systems are independent, the two sections of the working face adopt the coal mining-filling alternating type stage operation, the mining and filling operations are staggered, so that the two sections of the working face can perform parallel operations at different steps, the division of labor is obvious and does not affect each other, and it is ensured that two shifts of time in a day (i.e. 2 / 3 of the time in a day) are used for coal mining production, compared with the original one-shift production, the production is changed to two-shift production, and the starting rate reaches 67%, which is doubled compared with the original production mode, thereby effectively improving the starting rate of mining and the working efficiency of coal mining and filling of the coal mining working face, and realizing the technical effects of "preserving mining by filling and promoting mining by filling". BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a simplified schematic diagram of the structure distribution in the coal seam when the present application is applied.

[0023] The mark explanation in the figure is: 1, section A filling body, 2, section A fully mechanized working face three-machine matching equipment, 3, working face mineable coal body, 4, section B fully mechanized working face three-machine matching equipment, and 5, section B filling body. DETAILED DESCRIPTION

[0024] In order to better understand the purpose, structure and function of the present application, the present application will be further described in detail below in combination with the drawings.

[0025] The present application provides a paste filling staggered distance fully mechanized coal mining method, when it is applied in a coal seam, the distribution of each structure in the coal seam is as shown in the figure, and the steps include: Figure 1

[0026] A, the mining and filling process is composed of two systems, namely, a coal mining system and a filling system, the two systems are independent, wherein the coal mining system includes a mining roadway and coal transportation, the filling system includes filling of the roadway after mining and transportation of the filling material, the two systems are independent and do not affect each other, and can be simultaneously parallel operated, thereby improving the mining and filling efficiency. The working face mineable coal body 3 is divided into two sections, namely, section A and section B, which do not affect each other, and independent fully mechanized paste filling mining equipment is arranged for the section A and section B working faces according to the fully mechanized frame rear paste filling coal mining process, namely, the section A fully mechanized working face three-machine matching equipment 2 and the section B fully mechanized working face three-machine matching equipment 4, at the same time, the transportation systems of the section A and section B working faces are two sections of a whole, and the section A and section B implement the coal mining-filling alternating type stage coal mining operation according to the sequence;

[0027] ​In this embodiment, the specific lap joint mode is that the working face of the first section is provided with a scraper conveyor A capable of turning 90°, the rear end of the scraper conveyor A is turned into the middle roadway between the working faces of the first section and the second section to the end of the working face of the second section, the working face of the second section is provided with a scraper conveyor B to lap with the scraper conveyor A; the alternating type stage operation adopts a 3-8 operation mode, that is, one day is divided into 3 eight-hour periods, and the mining, filling and solidification of the first section and the second section are all carried out in units of 8 hours.

[0028] B, the first section first performs coal mining operation, and the second section waits to be staggered with the first section by two or more cycle step distances, in this embodiment, the number of cycle step distances of the first section staggered with the second section is two, that is, before the start of the three-shift mining in one day, one cycle step distance is mined in the first section in advance, and then another cycle step distance is mined in the first shift of the three shifts, during the two periods of time, the second section is in a waiting state; wherein, since the mining progress is affected by the specific conditions of the mining face, the cycle step distance range that can be generally achieved is 1.5m-3.4m, in this embodiment, the preferred range is 1.6m-3.2m;

[0029] C, in the second shift, that is, the second 8 hours, the first section stops mining after mining to the step distance within the specified range, and the goaf of the first section is subjected to paste filling, wherein the paste filling in this embodiment includes the steps of surrounding, filling and solidification of support filling, after the completion of the paste filling, the first section filling body 1 is formed in the first section, at the same time, the second section performs coal mining operation, and the mining step distance is the cycle step distance;

[0030] D, in the third shift, that is, the third 8 hours, the paste filling in the goaf of the first section is waited to solidify to the strength satisfying the mining condition, the second section mines to the set cycle step distance, and then stops the coal mining, and the goaf of the second section is subjected to paste filling, and after the completion of the filling, the second section filling body 5 is formed in the second section;

[0031] E, in the fourth shift, that is, the fourth 8 hours, the first section performs mining operation, and the second section waits for the paste filling in the goaf to solidify to the strength satisfying the mining condition;

[0032] F, the cycle steps C, D and E are repeated to mine the complete section coal seam.

[0033] In addition to the above steps, the step A in this embodiment further includes a filling station and a working face preparation stage:

[0034] The gangue is prepared into filling aggregate and powder, and is stored in the finished gangue yard warehouse, the fly ash and cementing material are stored in the special silo, sufficient amount of required water and external additive is prepared, the power supply, water supply and air supply systems are checked, it is confirmed that the equipment trial operation is normal, and it is confirmed that the underground pipeline, control valve, distributing device and filling bag are reliable.

[0035] The step C and step D also include a filling station and a working face formal filling stage:

[0036] During filling, the aggregate in the finished gangue yard warehouse is dropped to the aggregate metering mechanism, and after metering, it is conveyed to the paste proportioning and stirring system through a belt conveyor;

[0037] The fly ash, cementing material, water and additives pre-stored in the special silo are conveyed to the paste proportioning and stirring system after metering, mixed and stirred with the aggregate to form filling paste, which is conveyed to the working face goaf along the pipeline by the filling pump, and filling is performed according to the principle of alternating distribution.

[0038] After the paste filling in the step C and step D is completed and transferred to the next working face operation, the safety of the conveying pipeline and the state of the slurry are checked, the filling station facilities are maintained and cleaned, and the ground of the filling station is cleaned, and the residual impurities in the slurry storage pool are cleaned.

[0039] The conventional paste filling coal mining behind the fully mechanized support frame is performed according to the process of cutting coal first, then surrounding, then filling, and waiting for solidification, in the embodiment, the cutting coal and the paste filling are alternately and cyclically performed on the two working faces of A and B respectively, wherein the paste filling includes the three processes of surrounding, filling and solidification of the support filling, so that the cooperative operation of filling and coal mining is realized, and the efficiency of coal mining production is improved.

[0040] It can be understood that the present application is described through some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, the features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope of the present application.

Claims

1. A method for staggered longwall mining of coal using paste filling, characterized in that, The steps include: A. The coal mining face is divided into two sections, A and B, which do not affect each other's advancement. Independent fully mechanized longwall mining equipment is set up for sections A and B according to the fully mechanized longwall backfilling coal mining process. Section A and section B implement alternating stage operations of coal mining and backfilling. The alternating stage operations adopt the three-eight work mode, that is, the day is divided into three 8-hour periods, and the mining, backfilling and solidification of sections A and B are carried out in 8-hour units. B, Section A will start coal mining operations first, while Section B will wait until there are two or more staggered cycle steps; C. After section A is mined to the designated step distance, the goaf of section A is filled with paste, and section B is mined for coal mining. The mining step distance is a cycle step distance. D. Wait for the paste filling the goaf of section A to solidify to a strength that meets the mining conditions. After section B is mined to the set cycle step distance, coal mining is stopped, and paste filling is carried out on the goaf of section B. E, Section A will proceed with the next cycle of mining operations, while Section B will wait for the paste filling the goaf to solidify to a strength that meets the mining conditions; F, repeat steps C, D, and E until the entire coal seam is mined; In step A, the mining and filling process consists of two systems: a coal mining system and a filling system. The two systems are independent of each other. The coal mining system includes the mining roadway and coal transportation, while the filling system includes the filling of the roadway after mining and the transportation of filling materials. The two systems are independent, complementary, and can be operated in parallel at the same time.

2. The method for longwall mining with paste filling and staggered spacing according to claim 1, characterized in that, The range of the cyclic step distance in steps B and C is 1.5m-3.4m.

3. The method for longwall mining with paste filling and staggered spacing according to claim 1, characterized in that, In step A, a scraper conveyor A capable of turning 90° is installed on the working face of section A. The rear end of scraper conveyor A turns into the intermediate roadway between sections A and B to the end of section B. A scraper conveyor B is installed on section B and overlaps with scraper conveyor A.

4. The method for staggered coal mining with paste filling according to claim 1, characterized in that, Step A also includes the preparation stage for the filling station and working face: Gangue is prepared into filler aggregate and powder, and stored in the finished gangue stockpile. Fly ash and cementing materials are stored in special silos. Sufficient water and admixtures are prepared. The power supply, water supply and air supply systems are checked to confirm that the equipment is running normally. The reliability of underground pipelines, control valves, material distribution devices and filling bags is confirmed.

5. The method for longwall mining with paste filling and staggered spacing according to claim 1, characterized in that, Steps C and D also include the formal filling stage at the filling station and working face: During filling, the aggregate in the finished gangue stockpile is dropped into the aggregate metering mechanism, and after metering, it is transported to the paste proportioning and mixing system by a belt conveyor. Fly ash, cementing materials, water, and additives pre-stored in a special silo are metered and then transported to a paste mixing system. They are mixed with aggregates to form a filling paste, which is then pumped along pipelines to the goaf of the working face and filled according to the principle of alternating material distribution.

6. The method for longwall mining with paste filling and staggered spacing according to claim 1, characterized in that, After completing the paste filling in steps C and D and before moving to the next working face, check the safety of the conveying pipeline and the state of the slurry, repair and clean the filling station facilities, clean the ground of the filling station, and focus on cleaning the residual debris in the slurry storage tank.

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