Mud-water separation device

Abstract

The invention relates to the technical field of mud-water separation, in particular to a mud-water separation device which comprises a first cyclone, a first vibrating screen and a first water tank, the first cyclone comprises an underflow opening, and the underflow opening of the first cyclone is connected with the feeding end of the first vibrating screen; a notch of the first water tank is connected with the discharging end of the first vibrating screen in a bearing mode, and a pipeline of the first water tank is connected with the feeding end of the first cyclone. A first vibrating screen is connected below an underflow port of a first cyclone, and underflow slurry discharged from the underflow port of the first cyclone is dehydrated and filtered by the first vibrating screen; the first vibrating screen and the second vibrating screen are arranged, so that coarse-particle mud and sand are obtained on the screen surface of the first vibrating screen, fine-particle mud and sand discharged from the underflow port by mistake enter the first water tank along with water and are mixed with to-be-treated slurry, then the slurry in the first water tank is pumped into the first cyclone by the slurry pump to be screened, and waste of overflow slurry is reduced.

Description

Technical Field

[0001] This invention relates to the field of mud-water separation technology, and more particularly to a mud-water separation device. Background Technology

[0002] During tunnel boring machine (TBM) construction, a large amount of slurry is generated. Traditionally, a multi-stage slurry separation system centered around a hydrocyclone is used to treat this slurry. The working principle of a hydrocyclone is to use centrifugal force to achieve solid-liquid separation and particle classification: coarser particles are thrown against the wall under centrifugal force and eventually discharged from the underflow outlet, while finer particles are discharged with the overflow outlet. However, because this separation method relies on the centrifugal force on the particles and the fluid flow, in actual operation, particles with a diameter near the hydrocyclone's designed cut point are often difficult to strictly distinguish. These particles, which should be discharged with the overflow outlet, mistakenly enter the underflow outlet due to disturbance or concentration fluctuations, thus wasting the overflow slurry. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a mud-water separation device to reduce the waste of overflow slurry.

[0004] To solve the above-mentioned technical problems, the first technical solution adopted by the present invention is: a mud-water separation device, including a first hydrocyclone, a first vibrating screen and a first water tank, wherein the first hydrocyclone includes an underflow port, and the underflow port of the first hydrocyclone is connected to the feed end of the first vibrating screen; the opening of the first water tank is connected to the discharge end of the first vibrating screen, and the pipe of the first water tank is connected to the feed end of the first hydrocyclone.

[0005] Furthermore, the angle between the screen surface of the first vibrating screen and the horizontal plane is 3° to 10°.

[0006] Furthermore, the underflow port of the first hydrocyclone is connected to a pressure reducing box, and the pressure reducing box is provided with a discharge port that receives the feed end of the first vibrating screen.

[0007] Furthermore, the underflow port of the first hydrocyclone is used to discharge particulate material with a particle size of 0.074 mm to 4 mm, and the first vibrating screen is used to screen out particulate material with a particle size of 0.3 mm to 4 mm.

[0008] Furthermore, the mud-water separation device also includes a coarse screening assembly, which includes a drum screen and a second vibrating screen. The feed end of the second vibrating screen is located below the drum screen, and the opening of the first water tank is connected to the discharge end of the second vibrating screen.

[0009] Furthermore, the angle between the screen surface of the second vibrating screen and the horizontal plane is 3° to 10°.

[0010] Furthermore, the drum screen is used to screen out particulate materials with a particle size of 20 mm or more, and the second vibrating screen is used to screen out particulate materials with a particle size of 4 mm to 20 mm.

[0011] Furthermore, a mud-water separation device also includes a fine screening assembly and a second water tank. The fine screening assembly includes a second hydrocyclone and a third vibrating screen. The feed end of the second hydrocyclone is connected to the overflow port of the first hydrocyclone, the underflow port of the second hydrocyclone is connected to the feed end of the third vibrating screen, and the outlet of the second water tank is connected to the discharge end of the third vibrating screen.

[0012] Furthermore, the angle between the screen surface of the third vibrating screen and the horizontal plane is 3° to 10°.

[0013] Furthermore, the underflow port of the second hydrocyclone is used to discharge particulate material with a particle size of 0.02 mm to 0.074 mm, and the first vibrating screen is used to screen out particulate material with a particle size of 0.02 mm or larger.

[0014] The beneficial effects of this invention are as follows: A first vibrating screen is connected below the underflow port of the first hydrocyclone, and the first vibrating screen dewaters and filters the underflow slurry discharged from the underflow port of the first hydrocyclone; this results in coarse mud and sand particles being obtained on the screen surface of the first vibrating screen, while fine mud and sand particles discharged from the underflow port are carried into the first water tank with the water and mixed with the slurry to be treated. Then, the slurry in the first water tank is pumped into the first hydrocyclone for screening by the slurry pump, thereby reducing the waste of overflow slurry. Attached Figure Description

[0015] Figure 1 This is a system diagram of a mud-water separation device proposed in this invention; Figure 2 This is a schematic diagram of the structure of a mud-water separation device proposed in this invention; Figure 3 This is a schematic diagram of the assembly structure of the first hydrocyclone, the first vibrating screen and the first water tank of a mud-water separation device proposed in this invention. Figure 4 for Figure 3 Enlarged view of part A of a mud-water separation device; Figure 5 This is a schematic diagram of the coarse screen component of a mud-water separation device proposed in this invention; Figure 6 for Figure 5 Enlarged view of part B of a mud-water separation device; Figure 7 This is a schematic diagram of the fine screening component structure of a mud-water separation device proposed in this invention; Figure 8 for Figure 7 Enlarged view of section C of a mud-water separation device; Label Explanation: 1. First hydrocyclone; 11. Pressure reducing chamber; 2. First vibrating screen; 21. First spring; 22. First frame; 23. First screen plate; 24. First vibrating motor; 3. The first water tank; 4. Coarse screening assembly; 41. Rotary drum screen; 42. Second vibrating screen; 421. Second spring; 422. Second frame; 423. Second screen disc; 424. Second vibrating motor; 5. Fine screening assembly; 51. Second hydrocyclone; 52. Third vibrating screen; 6. Second water tank; 7. First slurry pump; 8. Second slurry pump. Detailed Implementation

[0016] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0017] During tunnel boring machine (TBM) construction, a large amount of slurry is generated, requiring solid-liquid separation and particle classification. Current methods commonly employ hydrocyclones for centrifugal separation. However, due to flow field disturbances or concentration fluctuations, particle classification is inaccurate, leading to the mis-discharge and waste of fine particles within a certain size range. This solution aims to reduce mis-separation errors and recover potentially mis-discharged fine particles, thus avoiding slurry waste. A vibrating screen is introduced into the hydrocyclone, forming a closed-loop reflux system. Based on the secondary physical separation of the vibrating screen, coarse particles are separated, while the fine particles mis-discharged by the hydrocyclone are returned to the hydrocyclone feed end for reprocessing and recycling.

[0018] Please refer to Figures 1 to 3 As shown, the present invention provides a mud-water separation device, comprising a first hydrocyclone 1, a first vibrating screen 2, and a first water tank 3. The bottom outlet of the first hydrocyclone 1 is connected to the feed end of the first vibrating screen 2; the opening of the first water tank 3 is connected to the discharge end of the first vibrating screen 2, and the pipe of the first water tank 3 is connected to the feed end of the first hydrocyclone 1.

[0019] Working principle: The slurry to be treated is stored in the first water tank 3. The first water tank 3 pumps the slurry into the first hydrocyclone 1 for screening via the first slurry pump 7. The first hydrocyclone 1 discharges the slurry of the required particle size from its overflow port and discharges the slurry of other particle sizes from its underflow port to the first vibrating screen 2. The first vibrating screen 2 dewaters and filters the underflow slurry discharged from the underflow port of the first hydrocyclone 1, so that coarse mud and sand particles are obtained on the screen surface of the first vibrating screen 2, and the fine mud and sand particles discharged from the underflow port enter the first water tank 3 with the water and mix with the slurry to be treated. Then, the first slurry pump 7 pumps the slurry in the first water tank 3 into the first hydrocyclone 1 for screening, thereby reducing the waste of overflow slurry.

[0020] Preferably, the underflow port of the first hydrocyclone 1 is used to discharge particulate material with a particle size of 0.074 mm to 4 mm, and the first vibrating screen 2 is used to screen out particulate material with a particle size of 0.3 mm to 4 mm.

[0021] It is worth noting that, please refer to Figure 4 As shown, the first vibrating screen 2 includes a first spring 21, a first frame 22, a first screen disc 23, and a first vibrating motor 24. The first spring 21 supports the first frame 22, which has a first screening cavity. The first screen disc 23 is disposed within the first screening cavity, and a first water tank 3 is located below the first screen disc 23. The first vibrating motor 24 vibrates the first frame 22. The first screen disc 23 is used to screen out particulate materials with a particle size of 0.3 mm to 4 mm.

[0022] The first vibration motor 24 has a vibration frequency of 50Hz to 60Hz and an amplitude of 3mm to 8mm.

[0023] In some embodiments, the angle between the screen surface of the first vibrating screen 2 and the horizontal plane is 3° to 10°. Preferably, when the soil is mud produced from a sand and gravel layer, the angle between the screen surface of the first vibrating screen 2 and the horizontal plane is 5°; when the soil is mud produced from a clay layer, the angle between the screen surface of the first vibrating screen 2 and the horizontal plane is 10°.

[0024] In some implementations, please refer to Figure 3 As shown, a pressure reducing box 11 is connected to the underflow port of the first hydrocyclone 1. The pressure reducing box 11 has a discharge port that receives the feed from the feed end of the first vibrating screen 2. The pressure reducing box 11 is installed at the underflow port of the first hydrocyclone 1 to buffer the discharged underflow slurry, preventing splashing of stone particles. Simultaneously, the pressure reducing box 11 stabilizes the air pressure at the underflow port of the first hydrocyclone 1, ensuring stable discharge from the underflow port of the first hydrocyclone 1.

[0025] In some implementations, please refer to Figure 5As shown, a mud-water separation device also includes a coarse screening assembly 4, which includes a drum screen 41 and a second vibrating screen 42. The feed end of the second vibrating screen 42 is located below the drum screen 41, and the opening of the first water tank 3 is connected to the discharge end of the second vibrating screen 42. Since the mud generated during shield tunneling contains large-sized stones, it is necessary to first screen particles larger than 20mm using the drum screen 41. Then, the mud passes through the plug holes of the drum screen 41 and enters the second vibrating screen 42 for screening, ensuring that only stone particles smaller than 20mm enter the first water tank 3. This prevents large-diameter stones from entering the first hydrocyclone 1 with the slurry, thus protecting the first hydrocyclone 1 from damage caused by large-diameter stones.

[0026] It is worth noting that, please refer to Figure 6 As shown, the second vibrating screen 42 includes a second spring 421, a second frame 422, a second screen disc 423, and a second vibration motor 424. The second spring 421 supports the second frame 422, which has a second screening cavity. The second screen disc 423 is disposed within the second screening cavity, and the first water tank 3 is located below the second screen disc 423. The second vibration motor 424 vibrates the second frame 422. The second screen disc 423 is used to screen out granular materials with a size of 4mm to 20mm.

[0027] The second vibration motor 424 has a vibration frequency of 50Hz to 60Hz and an amplitude of 3mm to 8mm.

[0028] In some embodiments, the angle between the screen surface of the second vibrating screen 42 and the horizontal plane is 3° to 10°. Preferably, when the soil is mud produced from a sand and gravel layer, the angle between the screen surface of the first vibrating screen 2 and the horizontal plane is 5°; when the soil is mud produced from a clay layer, the angle between the screen surface of the first vibrating screen 2 and the horizontal plane is 10°.

[0029] In some implementations, please refer to Figure 1 and Figure 7As shown, a mud-water separation device further includes a fine screening component 5 and a second water tank 6. The fine screening component 5 includes a second hydrocyclone 51 and a third vibrating screen 52. The feed end of the second hydrocyclone 51 is connected to the overflow port of the first hydrocyclone 1, the underflow port of the second hydrocyclone 51 is connected to the feed end of the third vibrating screen 52, and the opening of the second water tank 6 is connected to the discharge end of the third vibrating screen 52. The fine mud and sand particles screened out by the first hydrocyclone 1 are pumped into the second hydrocyclone 51 by the second slurry pump 8 for fine screening. The underflow slurry containing stone particles with a particle size of 0.02 mm to 0.074 mm is discharged from the second hydrocyclone 51 to the third vibrating screen 52. The underflow slurry discharged from the underflow outlet of the second hydrocyclone 51 is then dewatered and filtered by the third vibrating screen 52. This results in fine mud and sand particles being obtained on the screen surface of the first vibrating screen 2. The overflow slurry discharged from the overflow outlet of the second hydrocyclone 51 can be sent to a sedimentation tank, filter press and other filtration systems to obtain mud cake and water. The water is then reused in the tunnel boring machine construction to cool the tunnel boring machine blades.

[0030] In some embodiments, the angle between the screen surface of the third vibrating screen 52 and the horizontal plane is 3° to 10°. Preferably, when the soil is mud produced from a sand and gravel layer, the angle between the screen surface of the first vibrating screen 2 and the horizontal plane is 5°; when the soil is mud produced from a clay layer, the angle between the screen surface of the first vibrating screen 2 and the horizontal plane is 10°.

[0031] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A mud-water separation device, characterized in that: The device includes a first hydrocyclone, a first vibrating screen, and a first water tank. The first hydrocyclone includes an underflow port, which is connected to the feed end of the first vibrating screen. The opening of the first water tank is connected to the discharge end of the first vibrating screen, and the water tank pipe is connected to the feed end of the first hydrocyclone.

2. The mud-water separation device according to claim 1, characterized in that: The angle between the screen surface of the first vibrating screen and the horizontal plane is 3° to 10°.

3. The mud-water separation device according to claim 1, characterized in that: The underflow port of the first hydrocyclone is connected to a pressure reducing box, and the pressure reducing box is provided with a discharge port that receives the feed end of the first vibrating screen.

4. The mud-water separation device according to claim 1, characterized in that: The underflow port of the first hydrocyclone is used to discharge particulate material with a particle size of 0.074 mm to 4 mm, and the first vibrating screen is used to screen out particulate material with a particle size of 0.3 mm to 4 mm.

5. The mud-water separation device according to claim 1, characterized in that: It also includes a coarse screening assembly, which includes a drum screen and a second vibrating screen. The feed end of the second vibrating screen is located below the drum screen, and the opening of the first water tank is connected to the discharge end of the second vibrating screen.

6. The mud-water separation device according to claim 5, characterized in that: The angle between the screen surface of the second vibrating screen and the horizontal plane is 3° to 10°.

7. The mud-water separation device according to claim 5, characterized in that: The drum screen is used to screen out granular materials with a particle size of 20 mm or more, and the second vibrating screen is used to screen out granular materials with a particle size of 4 mm to 20 mm.

8. The mud-water separation device according to claim 1, characterized in that: It also includes a fine screening assembly and a second water tank. The fine screening assembly includes a second hydrocyclone and a third vibrating screen. The feed end of the second hydrocyclone is connected to the overflow port of the first hydrocyclone. The underflow port of the second hydrocyclone is connected to the feed end of the third vibrating screen. The outlet of the second water tank is connected to the discharge end of the third vibrating screen.

9. The mud-water separation device according to claim 8, characterized in that: The angle between the screen surface of the third vibrating screen and the horizontal plane is 3° to 10°.

10. The mud-water separation device according to claim 8, characterized in that: The underflow port of the second hydrocyclone is used to discharge particulate material with a particle size of 0.02 mm to 0.074 mm, and the first vibrating screen is used to screen out particulate material with a particle size of 0.02 mm or larger.

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