Precipitated crystal scraping and sucking integrated machine collecting device

Abstract

The application discloses a kind of precipitated crystal scraping and sucking integrated machine collection devices, including sedimentation tank, gas lifting device, mud scraper and control system, the rotating drive device drives the rotation shaft of the center of sedimentation tank to rotate around vertical axis, at least one mud scraping plate is fixed on the circumferential outside wall of rotation shaft, gas lifting device is fixedly installed on mud scraper, and each suction pipe of gas lifting device is arranged in front of mud scraping plate of mud scraper along the direction of rotation, the lower end opening of each suction pipe can be negative pressure adsorption crystal precipitate gathered by mud scraping plate on the bottom of sedimentation tank, the upper end of suction pipe can discharge crystal precipitate to specified position, gas supply device provides upward flowing high pressure gas for suction pipe, control system controls rotating drive device and gas supply device start-stop and operating power, the application can solve the problem that crystal is accumulated in the area with small slope outside the sedimentation tank, realizes the accurate and timely discharge of crystal particles, reduces the torque of mud scraper, and stabilizes the discharge of sedimentation tank.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a collection device that integrates sedimentation, crystal scraping, and suction. Background Technology

[0002] The resource recovery of substances such as fluorophosphate and calcium carbonate from wastewater has been initially industrialized in recent years. These pollutants can be recovered through reaction crystallization. Modifying existing water treatment facilities to perform crystallization reactions, and utilizing existing sedimentation tanks as crystal collection and trapping devices, can further reduce modification costs.

[0003] However, traditional sedimentation systems have certain common problems in crystal sedimentation. The main problem is that after the crystals enter the sedimentation tank, the area near the center sludge hopper of the sedimentation tank has a larger slope, and the crystal particles are easy to roll into the sludge hopper. However, the area away from the sludge hopper has a smaller slope, and the crystals are less able to roll and are not easy to enter the sludge hopper. Moreover, after long-term accumulation, there is a risk that the scraper in the sedimentation tank will be deformed or even bent and broken due to excessive torque. Summary of the Invention

[0004] To overcome the above-mentioned defects, the present invention provides a sedimentation crystal scraping and suction integrated collection device. This sedimentation crystal scraping and suction integrated collection device can effectively solve the problem of crystal accumulation in the area with a small slope around the sedimentation tank, which causes the scraper to malfunction. Moreover, it can achieve precise and timely discharge of crystal particles, thereby reducing the torque of the scraper and making the sedimentation and sludge discharge stable and controllable.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: a sedimentation crystal scraping and suction integrated collection device, including a sedimentation tank, an air-lift device, a sludge scraper, and a control system. The sludge scraper includes a rotating shaft, a rotating drive device, and a scraper blade. The rotating shaft extends vertically and is rotatably located at the center of the sedimentation tank. The rotating drive device drives the rotating shaft to rotate. At least one scraper blade is fixedly installed on the outer circumference of the rotating shaft. The air-lift device includes a suction pipe and an air supply device. The air-lift device is fixedly installed on the sludge scraper, and each suction pipe of the air-lift device is located in front of the scraper blade of the sludge scraper along the rotation direction. The lower opening of each suction pipe can adsorb the crystal sediment that has been scraped up and accumulated at the bottom of the sedimentation tank by the scraper blade under negative pressure. The upper end of the suction pipe can discharge the crystal sediment to a designated position. The air supply device provides high-pressure air flowing upward to the suction pipe. The control system controls the start and stop of the rotating drive device and the air supply device, as well as their operating power.

[0006] As a further improvement of the present invention, the scraper blade has a concave arc surface formed at the front along its rotation direction, and the suction pipe is located at the center of the concave arc surface of the scraper blade.

[0007] As a further improvement of the present invention, the bottom of the sedimentation tank is a conical bottom with a center height lower than the outer perimeter height, the lower end face of the scraper is parallel to the bottom of the sedimentation tank, and there is a set distance between the lower end face of the scraper and the bottom surface of the sedimentation tank.

[0008] As a further improvement of the present invention, the sludge scraper also includes a keel frame, which is parallel to the bottom surface of the sedimentation tank. The rotating shaft is fixedly installed at the center of the keel frame, and pairs of scraper blades are fixedly installed on the portions of the keel frame located on both sides of the rotating shaft. The lower end face of the scraper blade extends a set distance beyond the lower end face of the keel frame, and the suction pipe of the air lifting device is fixedly installed on the keel frame.

[0009] As a further improvement of the present invention, the suction pipe of the air-lift device includes a discharge pipe, a vertically extending air-lift pipe, a horizontally extending main suction pipe, and a vertically extending branch suction pipe. The discharge pipe is fixedly installed at the upper end of the air-lift pipe, one end of the discharge pipe is connected to the air-lift pipe, and the other end of the discharge pipe can discharge the crystal precipitate to a designated position. The main suction pipe is fixedly installed at the lower end of the air-lift pipe and is connected to the lower end of the air-lift pipe. Several branch suction pipes are spaced apart on the outer wall of the main suction pipe, and the upper end of each branch suction pipe is connected to the main suction pipe, and the lower end of each branch suction pipe forms a suction port.

[0010] As a further improvement of the present invention, the lower end face of each sludge suction branch pipe is at the same distance from the bottom surface of the sedimentation tank.

[0011] As a further improvement of the present invention, an auxiliary flow tube is also provided. The auxiliary flow tube is fixedly installed in the sedimentation tank. The feed inlet at the upper end of the auxiliary flow tube is higher than the liquid level in the sedimentation tank. The lower end of the auxiliary flow tube forms a discharge outlet for the material to be settled to enter the sedimentation tank. There is a set distance between the lower end of the auxiliary flow tube and the bottom surface of the sedimentation tank.

[0012] As a further improvement of the present invention, a conveying hopper is fixedly provided on the side wall of the auxiliary flow cylinder that is above the liquid surface of the sedimentation tank. The side wall of the sedimentation tank is provided with a conveying hopper connection port that is above the liquid surface. One end of the conveying hopper on the side wall of the auxiliary flow cylinder is fixedly connected to the side wall of the sedimentation tank and communicates with the conveying hopper connection port on the side wall of the sedimentation tank. The other end of the conveying hopper is communicated with the inside of the auxiliary flow cylinder. The material to be settled can enter the conveying hopper through the conveying hopper connection port and finally enter the auxiliary flow cylinder.

[0013] As a further improvement of the present invention, the upper end of the suction pipe can discharge the crystal precipitate into the conveying hopper, the auxiliary flow cylinder is concentrically located above the center of the sedimentation tank, the bottom surface of the sedimentation tank is provided with a concave mud hopper, and the lower end side wall of the mud hopper is provided with a mud discharge port, which can be opened periodically to discharge the crystal precipitate.

[0014] As a further improvement of the present invention, the upper end of the sedimentation tank is provided with an overflow weir, and an annular water-filling space is formed between the overflow weir and the upper side wall of the sedimentation tank. The upper side wall of the sedimentation tank is provided with an outlet that is directly connected to the annular water-filling space.

[0015] The beneficial effects of this invention are as follows: In the sedimentation tank, while a scraper collects the crystal precipitate deposited at the bottom of the tank, an air-lift device located in front of the rotating scraper blades simultaneously lifts away the collected crystal precipitate. This not only solves the problem of scraper malfunction caused by crystal accumulation in areas with shallow slopes around the sedimentation tank, resulting in lower scraper torque and stable and controllable sludge discharge, but also enables timely discharge of the crystal precipitate. The crystal precipitate can be precisely deposited into the sludge hopper of the sedimentation tank for unified discharge, or precisely discharged to a dewatering facility outside the sedimentation tank. In this device, to meet the requirements for efficient crystal processing, the scraper surface of the scraper is designed as an arc shape, which can collect the crystals at the bottom of the sedimentation tank radially, so that the crystals are concentrated at the position directly opposite the suction pipe of the air-lift device, making it easy to be quickly and centrally sucked away. The invention also sets up an auxiliary flow cylinder concentric with the sedimentation tank, through which the material to be settled is added and the air-lift device is directed toward the center of the sedimentation tank. The placement of the material to be settled and the discharge position of the air-lift device are precise and do not interfere with the discharge of the supernatant from the sedimentation tank, thus preventing crystal particles from being discharged from the sedimentation tank without settling. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention;

[0017] Figure 2 This is a front view illustrating the structural principle of the present invention;

[0018] Figure 3 This is a top view of the structural principle of the present invention;

[0019] Figure 4 This is a perspective view of the sedimentation tank of the present invention;

[0020] Figure 5 This is a perspective view of the air-lift device of the present invention;

[0021] Figure 6 This is a perspective view of the sludge scraper of the present invention;

[0022] Figure 7 This is a perspective view of the auxiliary flow tube of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Example: A sedimentation crystal scraping and suction integrated collection device includes a sedimentation tank 1, an air-lift device 2, a sludge scraper 3, and a control system. The sludge scraper 3 includes a rotating shaft 31, a rotating drive device, and a scraper blade 32. The rotating shaft 31 extends vertically and is rotatably located at the center of the sedimentation tank 1. The rotating drive device drives the rotating shaft 31 to rotate. At least one scraper blade 32 is fixedly installed on the outer circumference of the rotating shaft 31. The air-lift device 2 includes a suction pipe and an air supply device. The air-lift device 2 is fixedly installed on the sludge scraper 3, and each suction pipe of the air-lift device 2 is located in front of the scraper blade 32 of the sludge scraper 3 along the rotation direction. The lower opening of each suction pipe can adsorb the crystal sediment that has been scraped up and accumulated at the bottom of the sedimentation tank 1 by the scraper blade 32 under negative pressure. The upper end of the suction pipe can discharge the crystal sediment to a designated position. The air supply device provides high-pressure air flowing upward to the suction pipe. The control system controls the start and stop of the rotating drive device and the air supply device, as well as their operating power.

[0025] The rotating shaft 31 of the sludge scraper 3 is vertically installed inside the sedimentation tank 1, and is preferably aligned with the vertical center line of the sedimentation tank 1. During the sludge scraping process of the sludge scraper 3 in the sedimentation tank 1, the air lifting device 2 simultaneously pumps sludge. The air lifting device 2 rotates together with the sludge scraper 3, which can suck the crystal slurry on the bottom slope of the sedimentation tank 1 into the sludge suction pipe, thus preventing crystals from settling and accumulating on the bottom surface of the sedimentation tank 1.

[0026] The scraper blade 32 has a concave arc surface formed in front of its rotation direction, and the suction pipe is located at the center of the concave arc surface of the scraper blade 32. Ideally, the scraper blade 32 extends vertically to the arc-shaped plate. During the active scraping process, the scraper blade 32 has a radial gathering effect on the crystal precipitates at the bottom of the sedimentation tank 1, causing the crystal precipitates to concentrate below the suction pipe of the airlift device 2, so that they can be fully and quickly sucked away by negative pressure.

[0027] The bottom of the sedimentation tank 1 is a cone-shaped bottom with a center height lower than the outer perimeter height. The lower end face of the scraper 32 is parallel to the bottom of the sedimentation tank 1, and there is a set distance between the lower end face of the scraper 32 and the bottom surface of the sedimentation tank 1.

[0028] The sludge scraper 3 also includes a frame 33, which is parallel to the bottom surface of the sedimentation tank 1. The rotating shaft 31 is fixedly installed at the center of the frame 33. Pairs of scraper blades 32 are fixedly installed on the two sides of the frame 33 located on the rotating shaft 31, and the lower end face of the scraper blades 32 extends out of the lower end face of the frame 33 by a set distance. The suction pipe of the air lifting device 2 is fixedly installed on the frame 33. The rotating shaft 31, scraper blade 32, and frame 33 are preferably all made of metal and are welded together. The frame 33 has a symmetrical structure along the rotating pivot. The part of the frame 33 located on both sides of the rotating shaft 31 forms a V-shape with an included angle. The V-shaped frame 33 divides the sedimentation tank 1 into two equal parts. The bottom surface of the frame 33 of the scraper 3 is parallel to the bottom slope of the sedimentation tank 1, with an optimal distance of 100cm. The two scraper blades 32 are arranged symmetrically in mirror image along the frame 33. The upper end of the scraper blades 32 is welded to the side wall of the frame 33 through multiple connecting rods. The corresponding configuration of the air lifting device 2 is two sets, and the two sets of air lifting devices 2 are also arranged symmetrically in mirror image along the frame 33.

[0029] The suction pipe of the air-lift device 2 includes a discharge pipe 21, a vertically extending air-lift pipe 22, a horizontally extending main suction pipe 23, and a vertically extending branch suction pipe 24. The discharge pipe 21 is fixedly installed at the upper end of the air-lift pipe 22. One end of the discharge pipe 21 is connected to the air-lift pipe 22, and the other end of the discharge pipe 21 can discharge the crystal precipitate to a designated position. The main suction pipe 23 is fixedly installed at the lower end of the air-lift pipe 22 and is connected to the lower end of the air-lift pipe 22. Several branch suction pipes 24 are spaced apart on the outer wall of the main suction pipe 23, and the upper end of each branch suction pipe 24 is connected to the main suction pipe 23. The lower end of each branch suction pipe 24 forms a suction port. The main suction pipe 23 preferably extends radially along the sedimentation tank 1, with both ends of the main suction pipe 23 sealed. Vertical suction branch pipes 24 are located on the lower circumferential side of the main suction pipe 23. The discharge pipe 21, air-lift pipe 22, main suction pipe 23, and suction branch pipes 24 are hollowly connected. Ideally, several suction branch pipes 24 are evenly spaced along the main suction pipe 23, and are arranged axially along the main suction pipe 23. The main suction pipe 23 and its suction branch pipes 24 are located within the middle area of ​​the concave arc surface of the scraper plate 32. The junction of the air-lift pipe 22 of the air-lift device 2 and the horizontal suction pipe 23 is preferably located on the single keel frame 33. The position of the air-lift device 2 is not limited to the horizontal distance from one side of the keel frame 33 to the horizontal distance from the rotating shaft 31. The fixed position of the air-lift device 2 can be any parallel position from the point where the horizontal distance from one side of the keel frame 33 to the rotating shaft 31 is halfway. The air-lift device 2 rotates synchronously with the scraper blade 32 of the sludge scraper 3. The crystal precipitate on the bottom slope of the sedimentation tank 1 is sucked into each sludge suction branch pipe 24 under the action of negative pressure, and then enters the discharge pipe 21 through the horizontal sludge suction main pipe 23 and the air-lift pipe 22, and finally sprayed out from the other end of the discharge pipe 21.

[0030] The lower end face of each sludge suction branch pipe 24 is at the same distance from the bottom surface of the sedimentation tank 1. The length of each sludge suction branch pipe 24 gradually decreases from the middle of the sedimentation tank 1 to the outer edge, so that the lower end face of each sludge suction branch pipe 24 is at the same distance from the inclined bottom surface of the sedimentation tank 1, ensuring that the crystal particles are smoothly sucked into the sludge suction branch pipe 24.

[0031] An auxiliary flow cylinder 4 is also provided, which is fixedly installed inside the sedimentation tank 1. The inlet at the upper end of the auxiliary flow cylinder 4 is higher than the liquid level in the sedimentation tank 1, and the outlet at the lower end of the auxiliary flow cylinder 4 forms an outlet for the material to be settled to enter the sedimentation tank 1. There is a set distance between the lower end of the auxiliary flow cylinder 4 and the bottom surface of the sedimentation tank 1. The auxiliary flow cylinder 4 is preferably a cylindrical cylinder, and the auxiliary flow cylinder 4 is preferably concentric with the circular sedimentation tank 1. After the material to be settled (crystal slurry) enters the auxiliary flow cylinder 4 through the inlet at the upper end of the auxiliary flow cylinder 4, it enters the middle or lower layer of the sedimentation tank 1 through the outlet at the lower end of the auxiliary flow cylinder 4, avoiding disturbance to the supernatant in the upper layer of the sedimentation tank 1. After settling downwards in the middle or lower layer of the sedimentation tank 1, the material to be settled (crystal slurry) is deposited on the bottom surface of the sedimentation tank 1.

[0032] A conveying hopper 41 is fixedly installed on the side wall of the auxiliary flow cylinder 4, which is above the liquid surface of the sedimentation tank 1. A conveying hopper connection port 11, also above the liquid surface, is provided on the side wall of the sedimentation tank 1. One end of the conveying hopper 41 on the side wall of the auxiliary flow cylinder 4 is fixedly connected to the side wall of the sedimentation tank 1 and communicates with the conveying hopper connection port 11. The other end of the conveying hopper 41 communicates with the interior of the auxiliary flow cylinder 4. The material to be precipitated can enter the conveying hopper 41 through the conveying hopper connection port 11 and eventually enter the auxiliary flow cylinder 4. The auxiliary flow cylinder 4 is sealed to the opening of the conveying hopper 41 on the side wall of the sedimentation tank 1 through the conveying hopper 41. After the material to be precipitated (crystal slurry) is transported to the auxiliary flow cylinder 4 through the conveying hopper 41, it can enter the sedimentation tank 1 for sedimentation.

[0033] The upper end of the suction pipe can discharge crystal precipitate into the conveying hopper 41. The auxiliary flow cylinder 4 is concentrically located above the center of the sedimentation tank 1. The bottom center of the sedimentation tank 1 is provided with a recessed mud hopper 12. The lower side wall of the mud hopper 12 is provided with a mud discharge port 13, which can be opened periodically to discharge crystal precipitate. The crystal precipitate (crystal slurry) sprayed from the discharge pipe 21 of the air-lift device 2 can also enter the auxiliary flow cylinder 4. For example, if the other end of the discharge pipe 21 of the air-lift device 2 is directly opposite the upper opening of the auxiliary flow cylinder 4, or if an opening is provided on the conveying hopper 41, and the other end of the discharge pipe 21 of the air-lift device 2 is directly opposite the opening on the conveying hopper 41, then the crystal precipitate sucked up by the air-lift device 2 will be sent back into the auxiliary flow cylinder 4 and continue to settle down into the sludge hopper 12 of the sedimentation tank 1, and finally discharged from the system through the sludge discharge port 13 of the sedimentation tank 1. Of course, the slurry sprayed from the discharge pipe 21 of the air-lift device 2 is not limited to entering only the auxiliary flow cylinder 4 in the sedimentation tank 1, but can also be directly transported to the dewatering unit for processing.

[0034] The sedimentation tank 1 is provided with an overflow weir 14 at its upper end, forming an annular water-filled space between the overflow weir 14 and the upper side wall of the sedimentation tank 1. An outlet 15 is provided on the upper side wall of the sedimentation tank 1, directly communicating with this annular water-filled space. The supernatant overflows from the overflow weir 14 of the sedimentation tank 1 and is discharged from the system through the outlet 15. The overflow weir 14 can effectively block small crystal particles in the supernatant, further preventing any crystal particles from being discharged without settling.

Claims

1. A collection device for precipitated crystals using a scraping and suction integrated machine, characterized in that: The system includes a sedimentation tank (1), an air-lift device (2), a sludge scraper (3), and a control system. The sludge scraper includes a rotating shaft (31), a rotating drive device, and a scraper blade (32). The rotating shaft extends vertically and is rotatably located at the center of the sedimentation tank. The rotating drive device drives the rotating shaft to rotate. At least one scraper blade is fixedly installed on the outer circumference of the rotating shaft. The air-lift device includes a suction pipe and an air supply device. The air-lift device is fixedly installed on the sludge scraper, and each suction pipe of the air-lift device is located in front of the scraper blade of the sludge scraper along the rotation direction. The lower opening of each suction pipe can adsorb the crystal precipitate that has been scraped up and accumulated at the bottom of the sedimentation tank by the scraper blade under negative pressure. The upper end of the suction pipe can discharge the crystal precipitate to a designated position. The air supply device provides high-pressure air flowing upward to the suction pipe. The control system controls the start and stop of the rotating drive device and the air supply device, as well as their operating power.

2. The precipitated crystal scraping and suction integrated collection device according to claim 1, characterized in that: The scraper blade has a concave arc surface formed in front of it along its rotation direction, and the suction pipe is located at the center of the concave arc surface of the scraper blade.

3. The precipitated crystal scraping and suction integrated collection device according to claim 1, characterized in that: The bottom of the sedimentation tank is a cone-shaped bottom with a center height lower than the outer perimeter height. The lower end face of the scraper is parallel to the bottom of the sedimentation tank, and there is a set distance between the lower end face of the scraper and the bottom surface of the sedimentation tank.

4. The precipitated crystal scraping and suction integrated collection device according to claim 1, characterized in that: The sludge scraper also includes a keel frame (33), which is parallel to the bottom surface of the sedimentation tank. The rotating shaft is fixedly installed at the center of the keel frame. Pairs of scraper blades are fixedly installed on the keel frame on both sides of the rotating shaft, and the lower end of the scraper blades extends a set distance beyond the lower end of the keel frame. The suction pipe of the air lifting device is fixedly installed on the keel frame.

5. The precipitated crystal scraping and suction integrated collection device according to claim 1, 2, 3 or 4, characterized in that: The suction pipe of the air-lift device includes a discharge pipe (21), a vertically extending air-lift pipe (22), a horizontally extending main suction pipe (23), and a vertically extending branch suction pipe (24). The discharge pipe is fixedly installed at the upper end of the air-lift pipe. One end of the discharge pipe is connected to the air-lift pipe, and the other end of the discharge pipe can discharge the crystal precipitate to a designated position. The main suction pipe is fixedly installed at the lower end of the air-lift pipe and is connected to the lower end of the air-lift pipe. Several branch suction pipes are spaced apart on the outer wall of the main suction pipe, and the upper end of each branch suction pipe is connected to the main suction pipe. The lower end of each branch suction pipe forms a suction port.

6. The precipitated crystal scraping and suction integrated collection device according to claim 5, characterized in that: The lower end face of each sludge suction branch pipe is at the same distance from the bottom surface of the sedimentation tank.

7. The precipitated crystal scraping and suction integrated collection device according to claim 1, characterized in that: An auxiliary flow tube (4) is also provided. The auxiliary flow tube is fixedly installed in the sedimentation tank. The feed inlet at the upper end of the auxiliary flow tube is higher than the liquid level in the sedimentation tank. The lower end of the auxiliary flow tube forms a discharge outlet for the material to be settled to enter the sedimentation tank. There is a set distance between the lower end of the auxiliary flow tube and the bottom surface of the sedimentation tank.

8. The precipitated crystal scraping and suction integrated collection device according to claim 7, characterized in that: A conveying hopper (41) is fixedly installed on the side wall of the auxiliary flow cylinder that is higher than the liquid surface of the sedimentation tank. A conveying hopper connection port (11) higher than the liquid surface is provided on the side wall of the sedimentation tank. One end of the conveying hopper on the side wall of the auxiliary flow cylinder is fixedly connected to the side wall of the sedimentation tank and communicates with the conveying hopper connection port on the side wall of the sedimentation tank. The other end of the conveying hopper is connected to the inside of the auxiliary flow cylinder. The material to be settled can enter the conveying hopper through the conveying hopper connection port and finally enter the auxiliary flow cylinder.

9. The precipitated crystal scraping and suction integrated collection device according to claim 8, characterized in that: The upper end of the suction pipe can discharge crystal precipitate into the conveying hopper. The auxiliary flow cylinder is concentrically located above the center of the sedimentation tank. The bottom center of the sedimentation tank is provided with a concave mud hopper (12). The lower side wall of the mud hopper is provided with a mud discharge port (13). The mud discharge port can be opened periodically to discharge crystal precipitate.

10. The precipitated crystal scraping and suction integrated collection device according to claim 1, characterized in that: An overflow weir (14) is provided at the upper end of the sedimentation tank. An annular water-filled space is formed between the overflow weir and the upper side wall of the sedimentation tank. An outlet (15) is provided on the upper side wall of the sedimentation tank and is directly connected to the annular water-filled space.

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