CN117299735A - Method for layered landfill disposal of coal gangue - Google Patents
Method for layered landfill disposal of coal gangue Download PDFInfo
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- CN117299735A CN117299735A CN202311319282.7A CN202311319282A CN117299735A CN 117299735 A CN117299735 A CN 117299735A CN 202311319282 A CN202311319282 A CN 202311319282A CN 117299735 A CN117299735 A CN 117299735A
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- layer
- pipe
- embedded pipe
- coal gangue
- landfill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
- B09B1/004—Covering of dumping sites
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of gangue disposal, in particular to a method for layered landfill disposal of gangue, which comprises the following steps: s1, preprocessing a landfill site; s2, pipeline pre-embedding treatment: a first embedded pipe and a second embedded pipe are arranged on the landfill site, one end of the first embedded pipe is positioned on the landfill site, the other end of the first embedded pipe extends out of the landfill site, the second embedded pipe is vertically arranged on the landfill site and communicated with the first embedded pipe, and a plurality of ventilation holes are formed in the second embedded pipe along the length direction; s3, layered landfill treatment: filling a gangue layer and a yellow soil layer in a filling field, forming a layered structure of the gangue layer, the yellow soil layer and the gangue layer, wherein the uppermost layer of the layered structure is the yellow soil layer, the gangue layer and the yellow soil layer are compacted, and vent holes are formed at the positions of the second embedded pipe corresponding to each gangue layer; s4, conveying antioxidant gas into the second embedded pipe through the first embedded pipe. The invention can reduce the risk of spontaneous combustion of the gangue layer.
Description
Technical Field
The invention relates to the technical field of gangue disposal, in particular to a method for layered landfill disposal of gangue.
Background
The gangue is waste residue generated in the production process of coal mine, and accounts for about 10% of the yield of coal. Gangue discharged in the coal mining and coal washing processes is piled up into gangue hill, and the environmental hazard is great: land occupation, ecological influence and landscape damage; the waste dump leaching water (acid water) pollutes underground water sources and rivers, endangering crops and aquaculture; because of iron sulfide and carbon-containing substances in the gangue, the gangue can be spontaneously burned, a large amount of smoke dust is discharged, the atmosphere is seriously polluted, the human health is endangered, the plant growth is inhibited, and the building structure is corroded; individual gangue hill has explosion hidden trouble, and serious threat to mining area safety is formed.
The coal gangue is subjected to layered compaction in a common disposal mode, each layer of the coal gangue is covered with a layer of loess, each layer of loess is compacted, and finally, the surface of the coal gangue is compacted by covering with a layer of loess.
In view of the above-mentioned related art, the applicant believes that in the related art, although the surface of the gangue dump is compacted, because there are many pores in the interior of the gangue, external air easily enters the interior of the gangue, so that oxidation occurs in the interior of the gangue, and spontaneous combustion occurs.
Disclosure of Invention
The invention aims to provide a method for layered landfill disposal of coal gangue, which is used for inhibiting the oxidation speed of the inside of the coal gangue and reducing the risk of spontaneous combustion of the coal gangue.
The invention is realized by the following technical scheme:
a method for disposing coal gangue in a layered landfill mode comprises the following steps:
s1, preprocessing a landfill site;
s2, pipeline pre-embedding treatment: a first embedded pipe and a second embedded pipe are arranged on a landfill site, one end of the first embedded pipe is positioned on the landfill site, the other end of the first embedded pipe extends to the outside of the landfill site, one end of the second embedded pipe is positioned on the landfill site and communicated with the first embedded pipe, the other end of the second embedded pipe extends upwards, a plurality of vent holes are formed in the second embedded pipe along the length direction, and the top of the second embedded pipe is plugged;
s3, layered landfill treatment: paving a layer of coal gangue layer on a landfill site, paving a yellow soil layer on the coal gangue layer, paving the coal gangue layer on the yellow soil layer again, repeating the paving steps to form a layered structure of the coal gangue layer, the yellow soil layer and the coal gangue layer, wherein the uppermost layer of the layered structure is the yellow soil layer, compaction treatment is carried out on the coal gangue layer and the yellow soil layer, and vent holes are formed at the positions of the second embedded pipe corresponding to each coal gangue layer;
s4, conveying antioxidant gas into the second embedded pipe through the first embedded pipe.
Further, in step S1, the landfill site is first leveled and compacted, then a waterproof film is laid on the landfill site, and then a hardening layer is provided over the waterproof film.
Further, in step S1, a concrete retaining wall is disposed on the peripheral side of the landfill site, and the layered structure is located inside the concrete retaining wall.
Further, in step S2, a third embedded pipe is further disposed on the landfill, one end of the third embedded pipe is abutted to the landfill, the other end of the third embedded pipe extends to the upper portion of the uppermost layer of the yellow soil layer, a plurality of ventilation holes are formed in the third embedded pipe along the length direction, ventilation holes are formed in the positions, corresponding to each layer of coal gangue layer, of the third embedded pipe, an oxygen measuring assembly is disposed on the third embedded pipe and comprises a sealing cover and an oxygen sensor, the sealing cover is detachably disposed at the top opening end of the third embedded pipe, the oxygen sensor is disposed inside the third embedded pipe, and the oxygen sensor is electrically connected with a controller.
Further, the closing cap passes through threaded connection with the pre-buried pipe of third, the closing cap is located the inside one side of pre-buried intraductal montant of third, the montant extends to pre-buried place, just be provided with a plurality of sealing washer along the length direction of montant on the montant, a plurality of the sealing washer all is sliding seal with the pre-buried intraductal wall of third, adjacent two all be provided with oxygen sensor between the sealing washer, and every layer the inside corresponding position of gangue layer all is provided with oxygen sensor.
Further, one end of the first embedded pipe, which is positioned outside the landfill site, is communicated with a gas storage device, and the gas storage device stores antioxidant gas and is used for conveying the antioxidant gas to the first embedded pipe.
Further, the gas storage device comprises a first gas storage tank and a second gas storage tank, a first gas transmission pipe is communicated between the first gas storage tank and the first embedded pipe, a second gas transmission pipe is communicated between the second gas storage tank and the first embedded pipe, a first electromagnetic valve is arranged on the first gas transmission pipe, a second electromagnetic valve is arranged on the second gas transmission pipe, the first electromagnetic valve is electrically connected with the controller, nitrogen is stored in the first gas storage tank, and helium is stored in the second gas storage tank.
In step S4, the first electromagnetic valve and the second electromagnetic valve are opened, nitrogen and helium are conveyed into the second embedded pipe through the first embedded pipe, the helium concentration of each part outside the layered structure is detected, and the part, outside the layered structure, with the helium concentration higher than that in normal air is subjected to further compaction treatment and solidification treatment.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the first embedded pipe is used for conveying the antioxidant gas into the second embedded pipe, the antioxidant gas flows into the pores inside each gangue layer through the vent holes in the second embedded pipe, the antioxidant gas can extrude oxygen inside the gangue layer, the oxygen content inside the gangue layer is reduced, the oxidation reaction inside the gangue layer is restrained, and the spontaneous combustion inside the gangue layer is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention.
In the drawings:
fig. 1 is a schematic diagram of a coal gangue layered landfill structure in example 1 of the present invention.
In the drawings, the reference numerals and corresponding part names:
1. a first pre-buried pipe; 2. the second embedded pipe; 3. a vent hole; 4. a coal gangue layer; 5. a layer of yellow soil; 6. a hardening layer; 7. a concrete retaining wall; 8. a third pre-buried pipe; 9. ventilation holes; 10. a cover; 11. an oxygen sensor; 12. a vertical rod; 13. a mounting plate; 14. a seal ring; 15. a first air storage tank; 16. a second air storage tank; 17. a first gas pipe; 18. a second gas pipe; 19. a first electromagnetic valve; 20. and a second electromagnetic valve.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention. It should be noted that the present invention is already in a practical development and use stage.
Example 1
A method for layered landfill disposal of coal gangue, referring to fig. 1, comprising the steps of:
s1, preprocessing a landfill site;
s2, pipeline pre-embedding treatment: arranging a first embedded pipe 1 and a second embedded pipe 2 on a landfill site, wherein one end of the first embedded pipe 1 extends to the middle position of the landfill site, the other end extends to the outside of the landfill site, one end of the second embedded pipe 2 is positioned in the middle of the landfill site and communicated with the first embedded pipe 1, the other end extends upwards, a plurality of ventilation holes 3 are formed in the second embedded pipe 2 along the length direction, and the top end of the second embedded pipe 2 is plugged;
s3, layered landfill treatment: paving a coal gangue layer 4 on a landfill site, paving a yellow soil layer 5 on the coal gangue layer 4, paving the coal gangue layer 4 on the yellow soil layer 5 again, repeating the paving steps to form a layered structure of the coal gangue layer 4-the yellow soil layer 5-the coal gangue layer 4, wherein the uppermost layer of the layered structure is the yellow soil layer 5, the coal gangue layer 4 and the yellow soil layer 5 are compacted, the top of a second embedded pipe 2 extends to the position above the uppermost yellow soil layer 5, vent holes 3 are formed in the positions of the second embedded pipe 2 corresponding to each coal gangue layer 4, and the second embedded pipe 2 is buried by the layered structure;
s4, conveying antioxidant gas into the second embedded pipe 2 through the first embedded pipe 1.
In this scheme, carry the anti oxygen gas in to second built-in pipe 2 through first built-in pipe 1, the anti oxygen gas flows in a plurality of air vents 3 on the second built-in pipe 2 to the inside hole of every gangue layer 4, and the anti oxygen gas can extrude the inside oxygen of gangue layer 4, reduces the inside oxygen content of gangue layer 4, is favorable to restraining the inside oxidation reaction that takes place of gangue layer 4, and then reduces the inside condition that takes place the spontaneous combustion of gangue layer 4.
As a preferred embodiment, referring to fig. 1, in step S1, the landfill site is leveled and compacted, then a waterproof film is laid on the landfill site, and then a hardening layer 6 is disposed above the waterproof film, where the hardening layer 6 may be a cement layer, so as to enhance the bearing performance and the seepage-proofing performance of the landfill site, and reduce the infiltration of the polluted water formed after the rainwater is contacted with the gangue layer 4 into the underground polluted groundwater and river.
As a preferred embodiment, referring to fig. 1, in step S1, a concrete retaining wall 7 is disposed on the peripheral side of the landfill site, and the layered structure is located inside the concrete retaining wall 7, so that landslide collapse of the layered structure can be reduced, air circulation between the outside air and the layered structure can be easily accelerated, oxidation of the gangue layer 4 can be accelerated, and structural stability of the layered structure can be facilitated by the concrete retaining wall 7.
As a preferred embodiment, referring to fig. 1, in step S2, a third pre-buried pipe 8 is further disposed on the landfill, one end of the third pre-buried pipe 8 is abutted to the landfill, the other end extends above the uppermost layer of the yellow soil layer 5, a plurality of ventilation holes 9 are formed in the third pre-buried pipe 8 along the length direction, ventilation holes 9 are formed in the positions, corresponding to each layer of gangue layer 4, of the third pre-buried pipe 8, an oxygen measuring component is disposed on the third pre-buried pipe 8, the oxygen measuring component comprises a sealing cover 10 and an oxygen sensor 11, the sealing cover 10 is detachably disposed at the top opening end of the third pre-buried pipe 8, the oxygen sensor 11 is disposed inside the third pre-buried pipe 8, and the oxygen sensor 11 is electrically connected with a controller; the oxygen concentration inside the third embedded pipe 8 can be monitored through the oxygen measuring assembly, when the oxygen concentration inside the third embedded pipe 8 is higher, the fact that the oxygen concentration inside the coal gangue layer 4 is higher at the moment is explained, the condition that the coal gangue layer 4 is better in ventilation with the outside exists is explained, the controller sends out alarm information at the moment, and then the oxygen-resistant gas can be conveyed into the second embedded pipe 2 through the first embedded pipe 1 so as to control the oxygen content inside the coal gangue layer 4.
As a preferred embodiment, referring to fig. 1, a sealing cover 10 is connected with a third embedded pipe 8 through bolts, a vertical rod 12 is arranged on one side of the sealing cover 10, which is positioned in the third embedded pipe 8, the vertical rod 12 extends towards an embedded site, a mounting plate 13 is arranged on the vertical rod 12, an oxygen sensor 11 is positioned on the mounting plate 13, a plurality of sealing rings 14 are arranged on the vertical rod 12 along the length direction of the vertical rod 12, the sealing rings 14 are in sliding sealing with the inner side wall of the third embedded pipe 8, an oxygen sensor 11 is arranged between two adjacent sealing rings 14, and an oxygen sensor 11 is arranged at the corresponding position in each coal gangue layer 4; the oxygen content in the gangue layer 4 of each layer is monitored through the plurality of oxygen sensors 11, so that the fact that the oxygen content in the gangue layer 4 of a specific layer is higher is more intuitively monitored, and the corresponding gangue layer 4 is focused and processed.
As a preferred embodiment, referring to fig. 1, one end of the first embedded pipe 1 located outside the landfill site is provided with a gas storage device in a communicating manner, and the gas storage device stores an antioxidant gas and is used for delivering the antioxidant gas to the first embedded pipe 1; when the oxygen sensor 11 monitors that the oxygen content in the coal gangue layer 4 of a certain layer is higher, the oxygen-resistant gas can be conveniently and timely conveyed into the second embedded pipe 2 through the first embedded pipe 1 by the gas storage device, then the oxygen-resistant gas is conveyed into the coal gangue layer 4, the oxygen content in the coal gangue layer 4 is conveniently controlled, in addition, when the oxygen-resistant gas flows in the coal gangue layer 4, the heat generated by oxidation reaction due to the existence of a small amount of oxygen in the coal gangue layer 4 can be taken away, the heat in the coal gangue layer 4 finally brings out of the layered structure along with the oxygen-resistant gas, the oxygen-supply heat storage condition of the coal gangue layer 4 is damaged, and spontaneous combustion of the coal gangue layer 4 can be prevented to a certain extent.
As a preferred embodiment, referring to fig. 1, the gas storage device includes a first gas storage tank 15 and a second gas storage tank 16, a first gas pipe 17 is disposed between the first gas storage tank 15 and the first pre-buried pipe 1 in a communicating manner, a second gas pipe 18 is disposed between the second gas storage tank 16 and the first pre-buried pipe 1 in a communicating manner, a first electromagnetic valve 19 is disposed on the first gas pipe 17, a second electromagnetic valve 20 is disposed on the second gas pipe 18, the first electromagnetic valve 19 is electrically connected with the controller, nitrogen is stored in the first gas storage tank 15, and helium is stored in the second gas storage tank 16; when the oxygen sensor 11 monitors that the oxygen content in the coal gangue layer 4 is high, the controller opens the first electromagnetic valve 19, and the first air storage tank 15 conveys nitrogen to the first embedded pipe 1 through the first air conveying pipe 17, and then conveys nitrogen to the inside of all the coal gangue layers 4 so as to control the oxygen content in the layered structure.
As a preferred embodiment, referring to fig. 1, in step S4, the first solenoid valve 19 and the second solenoid valve 20 are opened, nitrogen and helium are fed into the second pre-buried pipe 2 through the first pre-buried pipe 1, the helium concentration of each part outside the layered structure is detected, and the part outside the layered structure, where the helium concentration is higher than the helium concentration in normal air, is subjected to further compaction and solidification; because helium diffusivity is stronger, helium from second buried pipe 2 fast flow through gangue layer 4 back diffusion to the layered structure outside, detect helium content in the layered structure outside, can find layered structure and the comparatively unobstructed position of outside air circulation, but the loess is spread at corresponding position this moment to carry out further compaction to loess and layered structure and handle, can also carry out the slip casting to corresponding position and handle, with the intercommunication passageway of isolated gangue layer 4 and outside air.
It should be noted that, on loess on the layered structure surface, flowers, plants and trees can be planted to stabilize the yellow soil layer 5, reduce the soil loss on the surface of the yellow soil layer 5, and reduce the exposure of the gangue layer 4 in the air.
Example 2
The present embodiment is different from embodiment 1 in that in the present embodiment, the oxygen-resistant gas stored in the first gas storage tank 15 may be neon, argon, krypton or xenon.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A method for layered landfill disposal of coal gangue is characterized by comprising the following steps: the method comprises the following steps:
s1, preprocessing a landfill site;
s2, pipeline pre-embedding treatment: a first embedded pipe (1) and a second embedded pipe (2) are arranged on a landfill site, one end of the first embedded pipe (1) is positioned on the landfill site, the other end of the first embedded pipe extends to the outside of the landfill site, one end of the second embedded pipe (2) is positioned on the landfill site and communicated with the first embedded pipe (1), the other end of the second embedded pipe extends upwards, a plurality of vent holes (3) are formed in the second embedded pipe (2) along the length direction, and the top of the second embedded pipe (2) is plugged;
s3, layered landfill treatment: paving a layer of coal gangue layer (4) on a landfill site, then paving a yellow soil layer (5) on the coal gangue layer (4), paving the coal gangue layer (4) on the yellow soil layer (5) again, repeating the paving steps to form a layered structure of the coal gangue layer (4) -the yellow soil layer (5) -the coal gangue layer (4), wherein the uppermost layer of the layered structure is the yellow soil layer (5), compacting treatment is carried out on the coal gangue layer (4) and the yellow soil layer (5), and vent holes (3) are formed in the positions of the second pre-buried pipe (2) corresponding to each layer of coal gangue layer (4);
s4, conveying antioxidant gas into the second embedded pipe (2) through the first embedded pipe (1).
2. The method for layered landfill disposal of coal gangue as claimed in claim 1, wherein: in step S1, the landfill site is flattened and compacted, then a waterproof film is laid on the landfill site, and then a hardening layer (6) is arranged above the waterproof film.
3. The method for layered landfill disposal of coal gangue as claimed in claim 1, wherein: in the step S1, a concrete retaining wall (7) is arranged on the periphery of the landfill site, and the layered structure is positioned on the inner side of the concrete retaining wall (7).
4. The method for layered landfill disposal of coal gangue as claimed in claim 1, wherein: in step S2, still be provided with third built-in pipe (8) on the landfill site, the one end and the landfill site looks butt of third built-in pipe (8), the other end extend to the yellow soil layer (5) top on the uppermost layer, a plurality of bleeder vents (9) have been seted up along length direction on third built-in pipe (8), third built-in pipe (8) all are equipped with bleeder vent (9) with the corresponding position of every layer gangue layer (4), be provided with oxygen measurement subassembly on third built-in pipe (8), oxygen measurement subassembly includes closing cap (10) and oxygen sensor (11), closing cap (10) detachable the setting is in the top open end of third built-in pipe (8), oxygen sensor (11) set up inside third built-in pipe (8), oxygen sensor (11) electric connection has the controller.
5. The method for layered landfill disposal of coal gangue as claimed in claim 4, wherein: the sealing cover (10) is connected with the third embedded pipe (8) through threads, one side of the sealing cover (10) positioned inside the third embedded pipe (8) is provided with a vertical rod (12), the vertical rod (12) extends towards an embedded field, a plurality of sealing rings (14) are arranged on the vertical rod (12) along the length direction of the vertical rod (12), the sealing rings (14) are all in sliding sealing with the inner side wall of the third embedded pipe (8), two adjacent sealing rings (14) are all provided with an oxygen sensor (11), and each layer of the oxygen sensor (11) is arranged at the corresponding position inside the gangue layer (4).
6. The method for layered landfill disposal of coal gangue as claimed in claim 4, wherein: one end of the first embedded pipe (1) positioned outside the landfill site is communicated with a gas storage device, and the gas storage device stores antioxidant gas and is used for conveying the antioxidant gas to the first embedded pipe (1).
7. The method for layered landfill disposal of coal gangue as claimed in claim 6, wherein: the gas storage device comprises a first gas storage tank (15) and a second gas storage tank (16), a first gas transmission pipe (17) is arranged between the first gas storage tank (15) and the first embedded pipe (1) in a communicating mode, a second gas transmission pipe (18) is arranged between the second gas storage tank (16) and the first embedded pipe (1) in a communicating mode, a first electromagnetic valve (19) is arranged on the first gas transmission pipe (17), a second electromagnetic valve (20) is arranged on the second gas transmission pipe (18), the first electromagnetic valve (19) is electrically connected with a controller, nitrogen is stored in the first gas storage tank (15), and helium is stored in the second gas storage tank (16).
8. The method for layered landfill disposal of coal gangue as claimed in claim 7, wherein: in step S4, the first electromagnetic valve (19) and the second electromagnetic valve (20) are opened, nitrogen and helium are conveyed into the second embedded pipe (2) through the first embedded pipe (1), the helium concentration of each part outside the layered structure is detected, and the part, outside the layered structure, with the helium concentration higher than that in normal air is subjected to further compaction treatment and solidification treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311319282.7A CN117299735A (en) | 2023-10-12 | 2023-10-12 | Method for layered landfill disposal of coal gangue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311319282.7A CN117299735A (en) | 2023-10-12 | 2023-10-12 | Method for layered landfill disposal of coal gangue |
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| Publication Number | Publication Date |
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| CN117299735A true CN117299735A (en) | 2023-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311319282.7A Pending CN117299735A (en) | 2023-10-12 | 2023-10-12 | Method for layered landfill disposal of coal gangue |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119114577A (en) * | 2024-10-14 | 2024-12-13 | 中国煤炭地质总局勘查研究总院 | A coal gangue layered landfill disposal device |
-
2023
- 2023-10-12 CN CN202311319282.7A patent/CN117299735A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119114577A (en) * | 2024-10-14 | 2024-12-13 | 中国煤炭地质总局勘查研究总院 | A coal gangue layered landfill disposal device |
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