CN218233688U

CN218233688U - Leachate collecting system of ash slag backfilling open pit

Info

Publication number: CN218233688U
Application number: CN202222509546.2U
Authority: CN
Inventors: 赵宇明; 武鸿鹏; 邵东琛
Original assignee: Inner Mongolia Power Survey & Design Institute Co ltd
Current assignee: Inner Mongolia Power Survey & Design Institute Co ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2023-01-06
Anticipated expiration: 2032-09-21

Abstract

The utility model discloses a filtration liquid collecting system of open pit is backfilled to lime-ash. Set up the sump pit in the pit, the sump pit includes catch basin and shaft, the catch basin set up in the low-lying department in the pit, the lateral wall bottom of shaft with the lateral wall top of catch basin corresponds to be connected the side slope in pit be provided with a plurality of with the drainage blind ditch that the lateral wall of shaft meets mutually. And (3) enabling the ash leachate to flow into the water collecting well, blocking the ash outside the water collecting well, and pumping out the leachate when the leachate in the water collecting tank rises to the absorption sill.

Description

Leachate collecting system of ash slag backfilling open pit

The technical field is as follows:

the utility model relates to a filtration liquid collecting system, concretely relates to be applied to filtration liquid collecting system of open pit is backfilled to lime-ash.

The background art comprises the following steps:

ash generated in a thermal power plant, a power plant, etc. during power generation needs to be collected, stored and shipped in an ash storage yard or a landfill so as not to pollute the environment. The method has the advantages that the ash field is built by utilizing the inherent abandoned mining pit, the national soil resource remediation can be effectively implemented, the land standardization integration is realized, the positive leading driving effect is realized on the promotion of the local environment treatment work, and the conditions are created for multiple links such as the development of the local environment protection work and the like. The method has the advantages that the waste mining pit is utilized, an ash storage yard is built, ash residues are used for backfilling, and the green environment is recovered after the storehouse is closed, so that the ash storage problem of a power plant is solved, the problem of treatment of the waste mining pit is solved, and win-win is realized.

Storage sites and landfills should typically include a leachate collection system for collecting leachate therein as specified in the general Industrial solid waste storage and disposal site pollution control Standard GB 18599-2020. The ash slag is stored in an ash storage field or a landfill, and when rainwater contacts with the ash slag, the pH value of leachate generated is high, and weak corrosivity is achieved. Therefore, the leachate in the ash field needs to be uniformly collected and centrally treated and then discharged or utilized. The existing percolate collecting system is mostly used for garbage percolate or mountain valley ash field percolate, but is not suitable for backfilling an open pit with ash slag. The garbage leachate collection system has a complex structure, and a guide and discharge device for garbage wastewater and generated waste gas is added; valley ash field leachate collection systems are typically constructed on a topographical basis, where leachate flows to a low-lying collection tank. Therefore, a technical scheme with a simple structure more suitable for ash backfilling the open pit needs to be provided.

The utility model has the following contents:

the utility model aims to solve the technical problem that to the not enough of above-mentioned prior art, a filtration liquid collecting system of open pit is backfilled to lime-ash is provided.

The utility model discloses by following technical scheme implement:

the utility model provides a filtration liquid collecting system of open-pit is backfilled to lime-ash sets up the sump pit in the open-pit, the sump pit is including for catch basin and shaft, the catch basin set up in the low-lying department of pit, the lateral wall bottom of shaft with the side wall lamp cloth of catch basin corresponds the connection the slope of pit be provided with a plurality of with the drainage blind ditch that the lateral wall of shaft meets mutually.

Furthermore, a plurality of first water inlet holes are formed in the side wall of the vertical shaft at the joint of the seepage drainage blind ditch.

Further, be provided with a plurality of soft pipes of permeating water in the drainage and seepage french drain, the natural stone bed of material is filled around the soft pipe of permeating water, the natural stone bed of material is wrapped up by one deck anti-geotechnological cloth of straining, anti-geotechnological cloth sets up one deck sand cobble transition layer outward, sand cobble transition layer with lay one deck prevention of seepage geomembrane between the bottom of drainage and seepage french drain. The natural stone layer plays a role in supporting the internal structure of the drainage blind ditch, the porosity is high, and leachate can enter the soft permeable pipe through the layer; the reverse filtration geotextile is made of a water permeable material, so that ash can be prevented from entering the soft water permeable pipe, and clear leachate can be obtained by filtration; the sand-gravel transition layer can intercept most of ash and slag to enable leachate to pass through; the impermeable geomembrane can prevent percolate which does not enter the soft water permeable pipe from permeating underground.

Furthermore, one end of the soft permeable pipe close to the vertical shaft is connected with the first water inlet hole, and the end head of one end far away from the vertical shaft is blocked by geotextile.

Furthermore, the seepage drainage blind ditches are arranged at the low-lying positions of the mine pit side slopes, so that the percolate enters the seepage drainage blind ditches according to the topography; the cross section of the drainage blind ditch is of an inverted trapezoidal structure with a wide upper part and a narrow lower part, and the gradient is 1.

Furthermore, a plurality of second water inlet holes are further formed in the side wall of the vertical shaft above the joint of the drainage blind ditch, and the outer sides of the second water inlet holes are wrapped by geotextile to prevent ash from entering the vertical shaft.

Further, a cushion layer of a plain concrete structure is laid between the bottom of the water collecting pond and the pit.

Furthermore, a force eliminating ridge is arranged on the inner wall of the joint of the vertical shaft and the water collecting tank along the circumferential direction. When the elevation of the accumulated water reaches the absorption ridge, the accumulated water in the water collecting tank needs to be discharged by a submersible pump and transported to a factory for treatment.

Furtherly, all be provided with the cat ladder on the inner wall of shaft and the outer wall. The operation and maintenance personnel can observe the percolate collected in the water collecting tank through the crawling ladder; when ponding needs to be discharged, the fortune dimension personnel can get into the sump pit through the cat ladder, put into the immersible pump.

Further, the leachate collection system of open pit is backfilled with lime-ash, it still includes the immersible pump, the immersible pump set up in the bottom of catch basin.

The noun interpretation:

an ash storage field: in the necessary places of thermal power plants and thermal power plants, the part of ash slag generated by burning coal in the power plants, which is not deducted for comprehensive utilization, needs to be transported to an ash storage field for landfill.

And (3) leachate: leachate is the product of the gravity flow of liquids in landfills and is primarily derived from precipitation and the inherent moisture of the refuse itself. The ash leachate is the liquid seeped out after the external water body (mainly from precipitation) soaks the ash.

The utility model has the advantages that:

the utility model provides a filtration liquid collecting system of open pit is backfilled to lime-ash can directly collect lime-ash filtration liquid at the pit. During operation, a submersible pump can be used for pumping out percolate, and meanwhile, the wall of a vertical shaft can be heightened, so that the percolate can be continuously collected by a collection system. The utility model discloses simple structure, area is little, and is with low costs, can unify the filtration liquid of collecting after filtering the lime-ash, satisfies the requirement of arranging of ash storage yard, avoids the polluted environment.

Description of the drawings:

in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a transverse cross-sectional view of a leachate collection system for ash backfilling an open pit;

FIG. 2 is a longitudinal cross-sectional view of a leachate collection system for an open pit with ash backfill;

fig. 3 is a cross-sectional view of a drainage blind ditch of a leachate collection system for an open pit with ash backfill.

The drawings illustrate the following: 1. a water collecting well; 11. a water collecting tank; 12. a shaft; 13. a first water inlet hole; 14. a second water inlet hole; 15. eliminating the force; 16. a cushion layer; 17. climbing a ladder; 2. draining a seepage blind ditch; 21. a flexible water permeable pipe; 22. a natural stone layer; 23. reversely filtering the geotextile; 24. a sand-gravel transition layer; 25. an impermeable geomembrane; 3. a submersible pump.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Examples

The utility model provides a filtration liquid collecting system of open pit is backfilled to lime-ash sets up sump pit 1 in the open pit, and sump pit 1 includes catch basin 11 and shaft 12, and catch basin 11 sets up in the low-lying department of pit, and the lateral wall bottom of shaft 12 corresponds with the lateral wall of catch basin 11 and is connected, is provided with a plurality of drainage blind ditches 2 that meet with the lateral wall of shaft 12 at the slope of pit.

The seepage drainage blind ditch 2 is arranged at a low-lying position of a mine pit side slope, so that percolate enters the seepage drainage blind ditch 2 according to the terrain; the cross section of the drainage blind ditch 2 is of an inverted trapezoidal structure with a wide upper part and a narrow lower part, the gradient is 1.

A plurality of soft permeable pipes 21 are arranged in the seepage drainage blind ditch 2, the diameter of each soft permeable pipe 21 is 200mm, a natural stone layer 22 is filled around each soft permeable pipe, the natural stone layer 22 is wrapped by a layer of reverse-filtering geotextile 23, a layer of sand-gravel transition layer 24 is arranged outside the reverse-filtering geotextile 23, and a layer of seepage-proofing geomembrane 25 is laid between the sand-gravel transition layer 24 and the bottom of the seepage drainage blind ditch 2. The thickness of the natural stone layer 22 is 500mm, the particle size of the selected sand pebbles is 200mm, the internal structure of the drainage blind ditch 2 is supported, the porosity is high, and leachate can enter the soft water permeable pipe 21 through the layer; the specification of the reverse filtering geotextile 23 is 400g/m ² The filter material is a water permeable material, so that ash can be prevented from entering the soft water permeable pipe 21, and clear percolate can be obtained by filtering; the thickness of the sand-gravel transition layer 24 is 150mm, the particle size of the selected sand-gravel is 20-50mm, most of ash can be intercepted, and leachate can pass through; the impermeable geomembrane 25 prevents leachate that does not enter the permeable hose 21 from permeating into the ground.

The side wall of the vertical shaft 12 at the joint of the drainage blind ditch 2 is provided with a plurality of first water inlet holes 13 with the diameter of 200mm. One end of the flexible permeable pipe 21 close to the vertical shaft 12 is connected with the first water inlet hole 13, and the end far away from the vertical shaft 12 is 400g/m ² The geotextile is used for plugging.

A plurality of second water inlet holes 14 with the diameter of 200mm are also arranged on the side wall of the vertical shaft 12 above the joint of the drainage blind ditch 2; 400g/m is used at the outer side of the second water inlet hole 14 ² To prevent ash from entering shaft 12.

And a force absorption ridge 15 is arranged on the inner wall of the joint of the vertical shaft 12 and the water collecting tank 11 along the circumferential direction, and the force absorption ridge 15 is 300mm high and 100mm wide. When the elevation of the accumulated water reaches the absorption threshold 15, the accumulated water in the water collecting tank 11 needs to be discharged by the submersible pump 3 and transported to a factory for treatment.

Between the bottom of the water collection basin 11 and the pit there is laid a mat 16 of plain concrete structure with an average thickness of 100mm. The collector well 1 is of a reinforced concrete structure, the thickness of the side wall of the collector tank 11 is 500mm, the thickness of the bottom of the collector tank is 600mm, and the thickness of the side wall of the vertical shaft 12 is 350mm. The width of the collector well 1 is 3.7m and the initial depth is 7m.

Ladders 17 are provided on both the inner and outer walls of the shaft 12. The filtration liquid that fortune dimension personnel accessible cat ladder 17 collected in the catch basin 11 is surveyd.

When the percolate collecting system of the ash residue backfilling open pit operates, the wall of the vertical shaft 12 is heightened in stages along with the rising of the ash surface, the height of the wall of the vertical shaft is kept 2m higher than the ash stacking surface, and the heightened height is not more than 7m each time until the wall of the vertical shaft is about to be flush with the ground of the pit. Considering that the barrel of the vertical shaft 12 is spliced, a joint bar with the length of 750mm is reserved at the top of the vertical shaft 12 and protected by M2.5 cement mortar, the mortar is removed and roughened for cleaning during high construction, and stressed steel bars are welded.

During the operation of the slag backfilling open pit leachate collecting system, the slag leachate is directly collected by the leachate collecting system in the pit, and when the leachate is fully collected in the water collecting tank 11, the leachate can be pumped out by using a submersible pump 3; meanwhile, the collecting system is used for continuously collecting percolate by heightening the wall of the vertical shaft 12.

The above description is only for the preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a filtration liquid collecting system of open pit is backfilled to lime-ash, its characterized in that sets up the sump pit in the pit, the sump pit includes catch basin and shaft, the catch basin set up in the low-lying department of pit, the lateral wall bottom of shaft with the lateral wall top of catch basin corresponds and is connected the slope of pit be provided with a plurality of with the drainage blind ditch that the lateral wall of shaft meets mutually.

2. The leachate collection system for an ash backfilled open pit according to claim 1, wherein said sidewall of said shaft at the junction with said drainage blind ditch is provided with a plurality of first inlet openings.

3. The leachate collection system for an ash backfilled open pit according to claim 2, wherein a plurality of soft permeable pipes are arranged in the drainage blind ditch, a natural stone layer is filled around the soft permeable pipes, the natural stone layer is wrapped by a reverse filter geotextile, a sand and gravel transition layer is arranged outside the reverse filter geotextile, and an impermeable geomembrane is laid between the sand and gravel transition layer and the bottom of the drainage blind ditch.

4. The leachate collection system in an ash backfilled open pit according to claim 3, wherein said flexible permeable pipe is connected to said first inlet hole at an end close to the shaft, and an end far from the end of the shaft is sealed with geotextile.

5. The leachate collection system for an ash backfilled open pit according to claim 1, wherein said drainage blind ditch is arranged at a low-lying position of a slope of the pit, and the cross section of said drainage blind ditch is in an inverted trapezoidal structure with a wide top and a narrow bottom, and the gradient is 1.

6. The leachate collection system for an ash backfilled open pit according to claim 1, wherein a plurality of second water inlets are further formed in the sidewall of the shaft above the junction with the drainage blind ditch, and the outside of each second water inlet is wrapped by geotextile.

7. The leachate collection system for an ash backfilled open pit of claim 1, wherein a mat of plain concrete construction is disposed between said pit and the bottom of said catch basin.

8. The leachate collection system for an ash backfilled open pit according to claim 1, wherein a force-absorbing ridge is circumferentially arranged on the inner wall of the junction of the vertical shaft and the water collecting tank.

9. The leachate collection system for an ash backfilled open pit of claim 1, wherein the inner wall and the outer wall of said shaft are provided with ladders.

10. The leachate collection system for ash backfilling an open pit according to any one of claims 1 to 9, further comprising a submersible pump disposed at the bottom of said collection basin.