A mobile drilling rig while-drilling wastewater purification system

Abstract

This invention discloses a mobile drilling rig wastewater purification system, comprising a buffer sedimentation tank, a filter tank, and a recycled water tank. A wastewater inlet pipe is installed on one side of the top of the buffer sedimentation tank, and a water distribution pump is installed on the wastewater inlet pipe. An overflow pipe is installed on the upper part of the other side of the buffer sedimentation tank, with its end extending into the top of the filter tank. By setting up a movable buffer sedimentation tank, filter tank, and recycled water tank for drilling, wastewater is sedimented and filtered, significantly shortening the process flow compared to conventional drilling rig wastewater treatment. Furthermore, by installing multiple polygonal ultrafiltration membranes and a negative pressure suction pipe in the filter tank, wastewater is purified without the need for coagulants or flocculants, improving water quality for repeated recycling and reducing water treatment costs. This solves the technical problems of low water resource utilization and high energy consumption in existing coal mine underground technologies.

Description

Technical Field

[0001] This invention belongs to the field of environmental engineering and water treatment, and relates to a filtration and purification system, specifically a mobile drilling rig wastewater purification system. Background Technology

[0002] Currently, underground drilling in coal mines is widely used for coalbed methane extraction, water exploration and drainage, grouting modification, resource exploration and rescue drilling. For relatively hard coal seams and rock formations, water drilling technology is usually used, which requires water as a flushing medium to carry away drill cuttings and cool the drill bit. Therefore, during underground drilling in coal mines, on the one hand, continuous water supply to the drill bit is required, and on the other hand, wastewater rich in drill cuttings and suspended solids is generated. At present, this wastewater is collected and then simply treated through a vibrating screen and a coagulation sedimentation tank before being reused. The wastewater treatment method has the following problems: 1) The coagulation sedimentation process requires the addition of chemicals and has requirements for sedimentation time, which cannot meet the timeliness requirements of underground drilling treatment; 2) The quality of the produced water is poor, causing wear and corrosion to the return pump and equipment, shortening its service life; 3) The water replenishment demand is large, which is not conducive to the efficient utilization of mine water resources, especially for arid and water-scarce mines, where the demand for fresh water replenishment is large, while the wastewater reuse rate is low, indirectly reducing the efficiency of underground production and increasing mining costs; 4) When the underground water supply is limited or difficult, it is easy to cause local production stoppages. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a mobile drilling rig wastewater purification system to solve the technical problems of low water resource utilization and high energy consumption in coal mines.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A mobile drilling rig wastewater purification system includes a buffer sedimentation tank, a filter tank, and a recycled water tank; a wastewater inlet pipe is provided on one side of the top of the buffer sedimentation tank, and a water distribution pump is provided on the wastewater inlet pipe; an overflow pipe is provided on the upper part of the other side of the buffer sedimentation tank, and the end of the overflow pipe extends into the top of the filter tank.

[0006] The filter tank is equipped with a ceramic ultrafiltration membrane support tube. The top of the ceramic ultrafiltration membrane support tube has an outlet in the middle. The two ends of the return water pipe extend into the outlet and the return water tank, respectively, and a negative pressure suction pump is installed on the return water pipe. The bottom of the ceramic ultrafiltration membrane support tube is equipped with multiple negative pressure suction pipes that are connected to the ceramic ultrafiltration membrane support tube. The negative pressure suction pipes form multiple polygons that are coaxially distributed in the radial direction. The bottom of each negative pressure suction pipe is equipped with an ultrafiltration membrane that is connected to it.

[0007] It also includes a spray structure, which includes two pairs of first high-pressure spray pipes symmetrically arranged between the inner wall of the filter tank and the ultrafiltration membrane, and two second annular high-pressure spray pipes with unequal diameters arranged at the bottom of the support frame. The two second annular high-pressure spray pipes are coaxially arranged and connected through branch high-pressure spray pipes. The tops of the two pairs of first high-pressure spray pipes are respectively connected to the radially outer second annular high-pressure spray pipes, and the bottoms of one pair of first high-pressure spray pipes are connected through second high-pressure branch spray pipes. A third high-pressure spray pipe is arranged at the axial center of the connecting pipe. The third high-pressure spray pipe is parallel to the first high-pressure spray pipes, and its top end does not exceed the top end of the ultrafiltration membrane.

[0008] The second annular high-pressure nozzle is also connected to a water inlet pipe, the end of which extends into the recycled water tank, and a water pump is installed on the water inlet pipe.

[0009] The bottom of both the buffer sedimentation tank and the filter tank is equipped with a filter press coal slurry conveying pipe; the bottom of the recycled water tank is equipped with a drilling rig production water distribution pipe.

[0010] This invention also includes the following technical features:

[0011] The support frame is equipped with a drive motor, the output shaft of which is positioned downwards and a drive gear is mounted on the output shaft; a driven gear is fixed in the middle of the top of the ceramic ultrafiltration membrane support tube, and the driven gear meshes with the drive gear.

[0012] The filtration pool includes a purification pool and a sludge hopper arranged from top to bottom.

[0013] The end of the filter press coal slurry conveying pipe is connected to a coal slurry filter press system.

[0014] The ultrafiltration membrane is a flat-plate ceramic ultrafiltration membrane.

[0015] Both the buffer sedimentation tank and the filtration tank are equipped with water collection tanks on the top inner wall.

[0016] It also includes an external PLC control system, which is electrically connected to the water distribution pump, the negative pressure suction pump, the water pump, and the drive motor.

[0017] The nozzles on the first high-pressure nozzle, the second annular high-pressure nozzle, the branch high-pressure nozzle, and the third high-pressure nozzle are all equally spaced.

[0018] Compared with the prior art, the beneficial technical effects of this invention are:

[0019] (I) In this invention, by setting up a buffer sedimentation tank, a filter tank, and a reclaimed water tank that can move with the drilling process, the wastewater is sedimented and filtered. Compared with the wastewater treatment of conventional drilling rigs, the process flow is shortened to the greatest extent. In addition, by setting up ultrafiltration membranes arranged in multiple polygons and negative pressure suction pipes in the filter tank, the wastewater is purified. The purification process does not require the addition of coagulants and flocculants, which not only improves the water quality and makes it reusable, but also reduces the water treatment cost. This solves the technical problems of low water resource utilization and high energy consumption in coal mines in the prior art.

[0020] (II) The system of the present invention significantly improves the quality of the produced water, and can achieve one-step continuous and efficient purification and ensure that the quality of the produced water meets the standards for a long time (in the produced water: SDI≤3, turbidity≤0.5NTU).

[0021] (III) The electrical components in this invention consist of only four parts: a water distribution pump, a drive motor, a negative pressure suction pump, and a water pump. The system operating pressure is <0.1MPa and the electricity consumption per ton of water is <0.35kwh.

[0022] (IV) The spray system in this invention can promptly flush the coal sludge filtered out on the ultrafiltration membrane, so that there is no accumulation of pollutants on the ultrafiltration membrane, the membrane flux recovery rate is high, the regenerability is good, the life of the ultrafiltration membrane can reach more than 10 years, and the fully automatic online cleaning system is adopted, with a low cleaning frequency.

[0023] (V) The ultrafiltration membrane is driven to rotate by a drive motor during the filtration process. This cross-flow and flushing self-cleaning mode makes the system extremely resistant to fouling, and regular flushing can restore it to its initial membrane flux (60-80 L / m³). 2 ·h). Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the filter tank in this invention;

[0026] Figure 3 This is a partial enlarged view of the structure of the filter tank in this invention;

[0027] Figure 4 This is a schematic diagram of the assembly structure of the ceramic ultrafiltration membrane support tube and the motor in this invention;

[0028] Figure 5 This is a schematic diagram of the ceramic ultrafiltration membrane support tube in this invention;

[0029] Figure 6 This is a schematic diagram of the structure of the ultrafiltration membrane in this invention.

[0030] The meanings of the labels in the diagram are as follows: 1-buffer sedimentation tank, 2-filtration tank, 3-reclaimed water tank, 4-wastewater inlet pipe, 5-water distribution pump, 6-overflow pipe, 7-return water pipe, 8-negative pressure suction pump, 9-ceramic ultrafiltration membrane support pipe, 10-outlet, 11-negative pressure suction pipe, 12-ultrafiltration membrane, 13-spray structure, 14-nozzle, 15-pressed coal slime conveying pipe, 16-drilling rig production water distribution pipe, 17-support frame, 18-drive motor, 19-drive gear, 20-driven gear, 21-water collection tank;

[0031] 201 - Purification tank; 202 - Sludge hopper;

[0032] 1301-First high-pressure nozzle, 1302-Second annular high-pressure nozzle, 1303-Water inlet pipe, 1304-Water pump, 1305-Branch high-pressure nozzle, 1306-Connecting pipe, 1307-Third high-pressure nozzle.

[0033] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, all components in this invention are those known in the art.

[0035] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0036] This invention provides a mobile drilling rig wastewater purification system, such as... Figures 1 to 6 As shown, it includes a buffer sedimentation tank 1, a filter tank 2 and a reclaimed water tank 3; a wastewater inlet pipe 4 is provided on one side of the top of the buffer sedimentation tank 1, and a water distribution pump 5 is provided on the wastewater inlet pipe 4; an overflow pipe 6 is provided on the upper part of the other side of the buffer sedimentation tank 1, and the end of the overflow pipe 6 extends into the top of the filter tank 2.

[0037] A ceramic ultrafiltration membrane support tube 9 is installed inside the filter tank 2. An outlet 10 is opened in the middle of the top of the ceramic ultrafiltration membrane support tube 9. The two ends of the return water pipe 7 extend into the outlet 10 and the return water tank 3, respectively, and a negative pressure suction pump 8 is installed on the return water pipe 7. Multiple negative pressure suction pipes 11 are installed at the bottom of the ceramic ultrafiltration membrane support tube 9 and are connected to the ceramic ultrafiltration membrane support tube 9. The negative pressure suction pipes 11 form multiple polygons that are coaxially distributed in the radial direction. Each negative pressure suction pipe 11 has an ultrafiltration membrane 12 connected to it at its bottom.

[0038] It also includes a spray structure 13, which includes two pairs of first high-pressure nozzles 1301 symmetrically arranged between the inner wall of the filter tank 2 and the ultrafiltration membrane 12, and two second annular high-pressure nozzles 1302 of unequal diameter arranged at the bottom of the support frame 17. The two second annular high-pressure nozzles 1302 are coaxially arranged and connected through a branch high-pressure nozzle 1305. The tops of the two pairs of first high-pressure nozzles 1301 are respectively connected to the radially outer second annular high-pressure nozzles 1302, and the bottoms of one pair of first high-pressure nozzles 1301 are connected through a second high-pressure branch nozzle 1306. A third high-pressure nozzle 1307 is arranged at the axial center of the connecting pipe 1306. The third high-pressure nozzle 1307 is parallel to the first high-pressure nozzles 1301, and its top end does not exceed the top end of the ultrafiltration membrane 12.

[0039] The second annular high-pressure nozzle 1302 is also connected to a water inlet pipe 1303, the end of which extends into the recycled water tank 3, and a water pump 1304 is installed on the water inlet pipe 1303.

[0040] Both the bottom of the buffer sedimentation tank 1 and the filter tank 2 are equipped with filter press coal slime conveying pipes 15; the bottom of the recycled water tank 3 is equipped with a drilling rig production water distribution pipe 16.

[0041] In the above technical solution, by setting up a buffer sedimentation tank 1, a filter tank 2, and a reclaimed water tank 3 that can move while drilling, the wastewater is sedimented and filtered, which shortens the process flow to the greatest extent compared with the wastewater treatment of conventional drilling rigs. In addition, by setting up ultrafiltration membrane sheets 12 arranged in multiple polygons and negative pressure suction pipes 11 in the filter tank 2, the wastewater is purified. The purification process does not require the addition of coagulants and flocculants, which not only improves the water quality and makes it reusable, but also reduces the water treatment cost, thus solving the technical problems of low water resource utilization and high energy consumption in coal mines in the prior art.

[0042] Secondly, the spray system 13 can promptly flush the coal sludge filtered out on the ultrafiltration membrane 12, ensuring that there is no accumulation of pollutants on the ultrafiltration membrane 12, resulting in high membrane flux recovery rate, good regenerability, and a lifespan of over 10 years for the ultrafiltration membrane 12. Furthermore, the fully automatic online cleaning system reduces the cleaning frequency.

[0043] In the filtration tank, by activating the negative pressure suction pump 8, the wastewater in the filtration tank 2 is filtered through the ultrafiltration membrane 12, causing impurities to be filtered to the outside of the ultrafiltration membrane 12. The filtered water then enters the negative pressure suction pipe 11 through the pipes on both sides of the ultrafiltration membrane 12 (see reference). Figure 6 The water then enters the ceramic ultrafiltration membrane support tube 9, then enters the return water pipe 7 from the outlet 10, and finally enters the recycled water tank 3 for reuse.

[0044] Specifically, a drive motor 18 is provided on the support frame 17, the output shaft of the drive motor 18 is set downward and a drive gear 19 is provided on the output shaft; a driven gear 20 is fixed in the middle of the top of the ceramic ultrafiltration membrane support tube 9, and the driven gear 20 meshes with the drive gear 19.

[0045] In the above technical solution, the ultrafiltration membrane is driven to rotate by a drive motor during the filtration process. This cross-flow and flushing self-cleaning mode makes the system extremely resistant to fouling, and the membrane flux can be restored to its initial level (60-80 L / m³) through periodic flushing. 2 ·h).

[0046] Furthermore, the aforementioned electrical components consist only of four parts: a water distribution pump, a drive motor, a negative pressure suction pump, and a water pump. The system operating pressure is <0.1MPa, and the power consumption per ton of water is <0.35kWh. Meanwhile, pilot-scale tests conducted at a mine in Inner Mongolia show that a membrane operating pressure of 0.012MPa to 0.08MPa can ensure a permeate flux of 60–85 L / m³. 2 •h, the actual measured power consumption per ton of water is <0.35kwh.

[0047] Specifically, the filtration tank 2 includes a purification tank 201 and a sludge hopper 202 arranged from top to bottom.

[0048] Specifically, the end of the filter press coal slime conveying pipe 15 is connected to a coal slime filter system for timely conveying of the settled coal slime.

[0049] Specifically, the ultrafiltration membrane 12 is a flat-panel ceramic ultrafiltration membrane.

[0050] Specifically, both the top inner walls of the buffer sedimentation tank 1 and the filter tank 2 are equipped with water collection troughs 21 for buffering and preventing the water flow from being too rapid, which would cause the settled coal sludge to rise.

[0051] Specifically, it also includes an external PLC control system, which is electrically connected to the water distribution pump 5, the negative pressure suction pump 8, the water pump 1304, and the drive motor 18. This system is used to monitor the influent water quality in real time and adjust key parameters such as the rotary motor speed, the negative pressure suction pump pressure, and the high-pressure flushing cycle accordingly, ensuring the continuous and stable operation of the system.

[0052] Specifically, the nozzles 14 on the first high-pressure nozzle 1301, the second annular high-pressure nozzle 1302, the branch high-pressure nozzle 1305, and the third high-pressure nozzle 1307 are evenly spaced.

[0053] In the above technical solution, the nozzles 14 on the second annular high-pressure nozzle 1302 and the branch high-pressure nozzle 1305 are located at the bottom, the nozzles 14 on the first high-pressure nozzle 1301 are located on the side close to the ultrafiltration membrane 12, and the nozzles 14 on the third high-pressure nozzle 1307 are uniformly distributed around its circumference.

Claims

1. A mobile drilling rig wastewater purification system, characterized in that, It includes a buffer sedimentation tank (1), a filter tank (2) and a reclaimed water tank (3); a wastewater inlet pipe (4) is provided on one side of the top of the buffer sedimentation tank (1), and a water distribution pump (5) is provided on the wastewater inlet pipe (4); an overflow pipe (6) is provided on the upper part of the other side of the buffer sedimentation tank (1), and the end of the overflow pipe (6) extends into the top of the filter tank (2); a support frame (17) is provided on the top end face of the filter tank (2). The filter tank (2) is provided with a ceramic ultrafiltration membrane support tube (9). The top of the ceramic ultrafiltration membrane support tube (9) is provided with an outlet (10). The two ends of the return water pipe (7) extend into the outlet (10) and the return water tank (3) respectively. A negative pressure suction pump (8) is provided on the return water pipe (7). The bottom of the ceramic ultrafiltration membrane support tube (9) is provided with a plurality of negative pressure suction pipes (11) that communicate with the ceramic ultrafiltration membrane support tube (9). The negative pressure suction pipes (11) form a plurality of polygons that are coaxially distributed in the radial direction. The bottom of each negative pressure suction pipe (11) is provided with an ultrafiltration membrane (12) that communicates with it. The support frame (17) is provided with a drive motor (18), the output shaft of the drive motor (18) is arranged downward and a drive gear (19) is provided on the output shaft; a driven gear (20) is fixed in the middle of the top of the ceramic ultrafiltration membrane support tube (9), and the driven gear (20) meshes with the drive gear (19); It also includes a spray structure (13), which includes two pairs of first high-pressure nozzles (1301) symmetrically arranged between the inner wall of the filter tank (2) and the ultrafiltration membrane (12) and two second annular high-pressure nozzles (1302) with different diameters arranged at the bottom of the support frame (17). The two second annular high-pressure nozzles (1302) are coaxially arranged and connected through a branch high-pressure nozzle (1305). The tops of the two pairs of first high-pressure nozzles (1301) are respectively connected to the second annular high-pressure nozzles (1302) on the radially outer side. The bottoms of one pair of first high-pressure nozzles (1301) are connected through a connecting pipe (1306). A third high-pressure nozzle (1307) is arranged at the axial center of the connecting pipe (1306). The third high-pressure nozzle (1307) is parallel to the first high-pressure nozzles (1301) and its top end does not exceed the top end of the ultrafiltration membrane (12). The second annular high-pressure nozzle (1302) is also connected to a water inlet pipe (1303), the end of which extends into the recycled water tank (3), and a water pump (1304) is installed on the water inlet pipe (1303). The bottom of the buffer sedimentation tank (1) and the filter tank (2) are both equipped with a filter press coal slurry conveying pipe (15); the bottom of the recycled water tank (3) is equipped with a drilling rig production water distribution pipe (16).

2. The mobile drilling rig wastewater purification system as described in claim 1, characterized in that, The filter pool (2) includes a purification pool (201) and a sludge hopper (202) arranged from top to bottom.

3. The mobile drilling rig wastewater purification system as described in claim 1, characterized in that, The end of the filter press coal slurry conveying pipe (15) is connected to a coal slurry filter press system.

4. The mobile drilling rig wastewater purification system as described in claim 1, characterized in that, The ultrafiltration membrane (12) is a flat ceramic ultrafiltration membrane.

5. The mobile drilling rig wastewater purification system as described in claim 1, characterized in that, Both the buffer sedimentation tank (1) and the filter tank (2) are equipped with water collection tanks (21) on the top inner wall.

6. The mobile drilling rig wastewater purification system as described in claim 1, characterized in that, It also includes an external PLC control system, which is electrically connected to the water distribution pump (5), the negative pressure suction pump (8), the water pump (1304) and the drive motor (18).

7. The mobile drilling rig wastewater purification system as described in claim 1, characterized in that, The nozzles (14) on the first high-pressure nozzle (1301), the second annular high-pressure nozzle (1302), the branch high-pressure nozzle (1305), and the third high-pressure nozzle (1307) are all equally spaced.

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