A drilling residue dewatering method based on solar ventilation

Abstract

The application discloses a kind of drilling slag dewatering methods based on solar ventilation, by reasonably arranging plastic drainage plate, laying site, applying solar power generation device to provide energy, energy heat collection component, air is dried and heated to a certain temperature, by gas component input drainage component plastic drainage plate, part of moisture in drilling slag is discharged through horizontal plastic drainage plate, part of moisture is drained along the plastic drainage of vertical direction into the water-permeable layer at the bottom of the pile, to achieve the purpose of continuously reducing the water content of drilling slag.The present application can overcome the shortcomings of the current large volume drilling slag dewatering by traditional methods and the deficiencies of drainage consolidation method in the application of large volume drilling slag, while solving the problem of no external power supply in some construction environments.

Description

TECHNICAL FIELD

[0001] The present application relates to a drilling residue dewatering method. BACKGROUND

[0002] Drilling residue has the characteristics of high water content, large compressibility, difficulty in dewatering, and low shear strength. Without dewatering treatment, it is difficult to directly act on construction land or be resourcefully utilized. At present, there is no efficient treatment method for drilling residue dewatering, and the on-site drilling residue is in the form of a large-volume drilling residue pile. The traditional drilling residue dewatering method often uses the method of spreading and drying to reduce the water content of drilling residue by infiltration and evaporation. The traditional drilling residue dewatering method occupies a large amount of land area and has low dewatering efficiency, and is generally only suitable for use in sandy soil areas.

[0003] Plastic drainage plates are often used to treat soft soil foundations and belong to the drainage consolidation method. The principle is to increase the drainage path of the soil layer, shorten the drainage distance, and accelerate the consolidation of the soil body by using plastic drainage plates. However, in the drainage process, the drainage consolidation method needs to overcome gravity in the drainage process by pre-pressing or creating a negative pressure environment, and the drainage effect is no longer obvious after the soil body reaches a certain water content. At the same time, part of the construction site drilling residue soil drying site has no external power supply conditions, and it is difficult to use mechanical dewatering.

[0004] At present, there is no technology that can greenly and efficiently dewater drilling residue, reduce dependence on site area, so as to dewater more drilling residue in limited drilling residue storage space, and conveniently and continuously dewater drilling residue. The treated drilling residue can be resourcefully utilized. SUMMARY

[0005] The present application aims to provide a drilling residue dewatering method based on solar ventilation, which can greenly and efficiently dewater drilling residue.

[0006] Technical scheme: A drilling residue dewatering method based on solar ventilation, comprising the following steps:

[0007] Step 1: Build a solar photovoltaic power generation device;

[0008] Step 2: Set a water-permeable layer on the site, and then lay a water-permeable geotextile on the surface;

[0009] Step 3: Place the on-site drilling residue on the water-permeable geotextile;

[0010] Step 4: insert a plurality of plastic drainage plates into the drill hole slag heap body by a plate inserting machine, including plastic drainage plates inserted in a horizontal direction and arranged in a matrix in the drill hole slag heap body, and the ends of the plastic drainage plates in the horizontal direction are located outside the heap body; a plurality of plastic drainage plates in a vertical direction are also inserted in the middle of the adjacent two columns of plastic drainage plates in the horizontal direction, and the ends of the plastic drainage plates in the vertical direction are close to or in contact with the water permeable geotextile;

[0011] Step 5: install a high-temperature dry air blowing assembly, the high-temperature dry air blowing assembly is connected to a gas supply main pipe, the gas supply main pipe is connected to the head end of each plastic drainage plate in the horizontal direction through a branch pipe, for sending high-temperature dry air into each plastic drainage plate in the horizontal direction; the high-temperature dry air blowing assembly is powered by the solar photovoltaic power generation device;

[0012] Step 6: start the high-temperature dry air blowing assembly and work for a period of time to complete the dehydration of the drill hole slag heap body.

[0013] Further, the plastic drainage plates in the drill hole slag heap body are spaced apart by 40-60cm in the up-down and left-right directions.

[0014] Further, the branch pipes are respectively connected to the head end of each plastic drainage plate in the horizontal direction using airtight hoses, and the front end of the airtight hose is inserted into the drill hole slag heap body by 30-40cm.

[0015] Further, the water permeable layer is waste brick slag, waste concrete slag or a mixture of the two, and the thickness is 20-50cm.

[0016] Further, in step 5, the high-temperature dry air blowing assembly heats the air to 70℃.

[0017] Beneficial effects: the present application can reasonably arrange the plastic drainage plates, and apply a solar power generation device to provide energy, dry and heat the air to a certain temperature, and then input the air into the plastic drainage plates in the horizontal direction through the air supply assembly, part of the water in the drill hole slag penetrates into the plastic drainage plates in the horizontal direction and is carried away by the dry gas, and the remaining water is discharged into the water permeable layer through the vertical plastic drainage plates under the action of the self-weight stress, so that the water content of the drill hole slag is continuously reduced.

[0018] The present application can overcome the shortcomings of the current large-volume drill hole slag dehydration by the traditional method and the shortcomings of the drainage consolidation method in the application of large-volume drill hole slag, and has the following advantages:

[0019] (1)The working energy is from solar energy, effectively solving the energy problem, meeting the concept of green development, and solving the problem of limited energy in the dehydration site. The component cost is low, and the connecting pipeline can use PVC material. Using solar energy to supply energy is more environmentally friendly, continuous energy supply, long-term development reduces project cost, and economic benefit is obvious. No need to add any chemicals and curing materials during the treatment process, no secondary pollution occurs.

[0020] (2) Limited by the site: compared with the traditional drilling residue treatment method, it does not need to be spread and dried, and theoretically, more drilling residues can be dehydrated at one time under the construction conditions, the required site area is smaller, and the site is paved with 20-50cm waste brick and waste concrete residue, so it is not limited by the site soil quality, and the secondary utilization of construction waste can be realized.

[0021] (3) Good drying effect: since solar energy is used for energy supply, the dry air in the horizontal plastic drainage plate flows quickly and takes away the water in the drilling residue, and the plastic drainage plate is arranged at an interval of 50cm, so that the soil dehydration is more uniform, and the state of external dryness and internal wetness is avoided.

[0022] (4) When the vertical plastic drainage plate is inserted, due to the stress of the drilling residue self-weight, the water in the drilling residue is guided to the water-permeable layer through the vertical plastic drainage plate to discharge part of the water, reducing the work intensity of the later dehydration, and achieving the effect of "pre-discharge".

[0023] (5) One solar heat collecting component and gas conveying component can be matched with the pipeline arranged in a relatively long section, which is suitable for various complex environments and has lower maintenance cost and is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of the method of the application;

[0025] Figure 2 is a schematic diagram of the plastic drainage plate arrangement in the drilling residue pile;

[0026] Figure 3 is a schematic diagram of the insertion of the front end of each branch pipe into the drilling residue pile through airtight hose. EMBODIMENT

[0027] The application will be further explained in conjunction with the drawings.

[0028] As shown in Figure 1 , a drilling residue dehydration method based on solar ventilation includes the following steps:

[0029] Step 1: Build a solar photovoltaic power generation device on site, including a solar power generation panel 1 and a storage battery 2.

[0030] Step 2: Before stockpiling the drilling cuttings, the site is prepared by setting up a permeable layer 3 on the site, and then laying a permeable geotextile on the surface. The permeable layer 3 is made of waste brick debris, waste concrete debris, or a mixture of both, and has a thickness of 20-50cm.

[0031] Step 3: Pile the drill cuttings onto the permeable geotextile.

[0032] Step 4: Insert several plastic drainage boards into the borehole slag heap 4 using a board inserter. Specifically, for example... Figure 2 As shown, plastic drainage boards 5 are inserted horizontally and arranged in a matrix pattern within the borehole cuttings pile 4, with the ends of the horizontal plastic drainage boards 5 located outside the pile. Several vertical plastic drainage boards 6 are also inserted at intervals between adjacent rows of horizontal plastic drainage boards, with the ends of the vertical plastic drainage boards 6 close to or in contact with the permeable geotextile. The plastic drainage boards within the borehole cuttings pile 4 are spaced 40-60cm apart vertically and horizontally to ensure effective dewatering. The spacing between the top layer of horizontal plastic drainage boards can be slightly larger than in other locations.

[0033] The plastic drainage board has an extruded plastic core board in the middle, which serves as the skeleton and channel of the drainage board. Its cross-section is in the shape of a parallel cross, and both sides are wrapped with non-woven geotextile as a filter layer. The core strip provides support and drains water that seeps into the filter layer. In this invention, water in the borehole cuttings can penetrate the filter layer and enter the plastic drainage board in both the horizontal and vertical directions under its own weight stress.

[0034] When inserting plastic drainage boards into the borehole slag heap, they should be "booted" to prevent borehole slag from entering the plastic drainage board channels or tearing the drainage board filter membrane, while also effectively preventing the drainage board from carrying back.

[0035] Step 5: Install the high-temperature drying air supply assembly, including a blower 7 and an air heating and drying unit 8. The high-temperature drying air supply assembly is connected to the main air supply pipe 9, and branch pipes 10 are connected to the main air supply pipe 9. The ends of each branch pipe 10 are connected to the beginning of each horizontal plastic drain plate 5 using a sealed flexible hose, for supplying high-temperature drying air into each horizontal plastic drain plate 5. Figure 3 As shown, the front end of the sealed flexible hose is inserted 30-40cm into the borehole cuttings pile 4 to prevent the high-temperature dry air from dissipating into the air before entering the borehole cuttings. This sealed flexible hose can be made of PVC plastic. The high-temperature dry air supply component is powered by a solar photovoltaic power generation device.

[0036] Step 6: Start the high-temperature drying air supply assembly, dry and heat the air to 70℃ and send it into the horizontal plastic drainage board 5, the drying gas flows along the plastic drainage board from the head end to the tail end, part of the water in the drill hole residue pile seeps into the horizontal plastic drainage board 5 and is taken away by the drying gas and discharged from the tail end; at the same time, the water seeping into the vertical plastic drainage board 6 moves downward along the plastic drainage board and is discharged from the tail end and then passes through the water-permeable geotextile and is dispersed into the water-permeable layer 3. The high-temperature drying air supply assembly continues to work for a period of time to achieve the purpose of continuously reducing the water content of the drill hole residue, thereby completing the dehydration of the drill hole residue pile.

[0037] Step 7: After the water content of the drill hole residue pile 4 reaches the preset value, the plastic drainage boards are pulled out.

[0038] The above only describes the preferred embodiments of the present application, and it should be noted that for ordinary skilled persons in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered within the protection scope of the present application.

Claims

1. A method for dewatering drilling cuttings based on solar ventilation, characterized in that, The method comprises the following steps: Step 1: build a solar photovoltaic power generation device; Step 2: set a water-permeable layer on the site, and then lay a water-permeable geotextile on the surface; Step 3: place the on-site drilling slag on the water-permeable geotextile; Step 4: insert a plurality of plastic drainage boards into the drilling slag body by a board inserting machine, including horizontally inserting and matrixly spacing the plastic drainage boards in the drilling slag body, and the ends of the horizontal plastic drainage boards are located outside the body; a plurality of vertical plastic drainage boards are also inserted in the middle of the adjacent two columns of horizontal plastic drainage boards, and the ends of the vertical plastic drainage boards are close to or in contact with the water-permeable geotextile; Step 5: install a high-temperature dry air blowing assembly, which is connected to a gas main pipe, and the gas main pipe is connected to the head end of each horizontal plastic drainage board through each branch pipe for sending high-temperature dry air into each horizontal plastic drainage board; the high-temperature dry air blowing assembly is powered by the solar photovoltaic power generation device; Step 6: start the high-temperature dry air blowing assembly and work for a period of time to complete the dehydration of the drilling slag body; The plastic drainage boards in the drilling slag body are spaced 40-60 cm apart in all directions; Each branch pipe is connected to the head end of each horizontal plastic drainage board using a closed hose, and the front end of the closed hose is inserted into the drilling slag body by 30-40 cm; The water-permeable layer is waste brick slag, waste concrete slag, or a mixture of the two, and the thickness is 20-50 cm; In step 5, the high-temperature dry air blowing assembly heats the air to 70℃.

Images