Crystal selective crystal rejection assembly sump

Abstract

This invention discloses a selective crystal removal combined sedimentation tank, comprising a sedimentation tank shell, a pre-sedimentation tank, a crystal slurry feed pipe, and a stripping device. The pre-sedimentation tank is fixedly installed inside the sedimentation tank shell, and the outlet end of the crystal slurry feed pipe is connected to the upper end of the pre-sedimentation tank. The pre-sedimentation tank can separate large and small crystal particles in the crystal slurry and discharge the small crystal particles and water into the sedimentation tank shell. The stripping device includes a stripping pipe and a high-pressure gas supply device. The lower end of the stripping pipe extends into the pre-sedimentation tank, and the upper end extends to the outside of the sedimentation tank shell. The high-pressure gas supply device provides high-pressure gas flowing from bottom to top to the stripping pipe. Under the action of stripping suction, the lower end of the stripping pipe can discharge the large crystal particles separated in the pre-sedimentation tank to a designated position. This invention can separate and discharge large crystal particles in advance, solve the problem of overload of the sludge scraper, and ensure stable crystal production and uniform and stable crystal particle size.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a crystal selective crystal removal combined sedimentation tank. Background Technology

[0002] Crystallization technology based on wastewater resource recovery has become a popular area of ​​research and application. One approach, which involves converting wastewater into crystallization devices in situ, achieves crystallization without altering the original treatment process, thereby increasing purity and selling price. A key challenge in this conversion is the impact of the existing sedimentation tank on fine sludge particles, versus the impact of the gradually growing crystal particles on the existing sludge scraping device.

[0003] In the process of crystal preparation in a continuous crystallizer reactor, factors such as changes in supersaturation due to mass transfer and crystal friction breakage result in a distribution of crystals of varying sizes. As the water volume processed by the crystallizer fluctuates, larger particles are also lost from the crystallizer with the higher flow rate of the effluent. Therefore, it is necessary to use a sedimentation tank again to settle and retain the crystallized effluent and collect the lost smaller particles.

[0004] Traditional sedimentation tank scrapers do not overload or deform when processing small-particle solid sludge into the sedimentation tank hopper because the sludge particles are small. However, when processing larger crystal particles, the nesting of larger particles causes particle accumulation at the bottom of the sedimentation tank, away from the hopper. This leads to increased torque load on the scraper during scraping, causing the scraper motor to overload and trip, thus affecting production. Summary of the Invention

[0005] To overcome the above deficiencies, the present invention provides a crystal selective crystal removal combined sedimentation tank, which can separate and discharge large crystal particles in advance, solve the problem of overload of the sludge scraper, and ensure stable crystal production and uniform and stable crystal particle size.

[0006] The technical solution adopted by this invention to solve its technical problem is: a crystal selective crystal removal combined sedimentation tank, including a sedimentation tank shell, a pre-sedimentation tank, a crystal slurry feed pipe, and a stripping device. The pre-sedimentation tank is fixedly installed inside the sedimentation tank shell. The discharge end of the crystal slurry feed pipe is connected to the upper end of the pre-sedimentation tank. The pre-sedimentation tank can separate large and small crystal particles in the crystal slurry and discharge the small crystal particles and water into the sedimentation tank shell. The stripping device includes a stripping pipe and a high-pressure gas supply device. The lower end of the stripping pipe extends into the pre-sedimentation tank, and the upper end extends to the outside of the sedimentation tank shell. The high-pressure gas supply device provides high-pressure gas flowing from bottom to top to the stripping pipe. The lower end of the stripping pipe can discharge the large crystal particles separated in the pre-sedimentation tank to a designated position under the action of stripping suction.

[0007] As a further improvement of the present invention, the pre-sedimentation tank is a cylindrical structure with an open top and a closed bottom. Its upper section is a cylindrical cyclone, and its lower section is a flat-bottomed conical bucket with an upper diameter larger than the lower diameter. The crystal slurry feed pipe is rotary-cut and connected to the side wall of the cylindrical cyclone in the upper section of the pre-sedimentation tank, and the lower end of the stripping pipe extends into the flat-bottomed conical bucket.

[0008] As a further improvement of the present invention, a guide tube is also fixedly installed inside the outer shell of the sedimentation tank. The guide tube is sleeved on the outer side of the upper end of the pre-sedimentation tank, and an annular gap is formed between the inner side wall of the guide tube and the outer side wall of the pre-sedimentation tank. The upper end of the guide tube is higher than the liquid level of the outer shell of the sedimentation tank, the lower end of the guide tube is lower than the discharge end of the crystal slurry feed pipe, and the lower end of the guide tube is higher than the connection position between the bottom of the flat-bottomed conical bucket and the cylindrical vortex tube.

[0009] As a further improvement of the present invention, the sedimentation tank shell, the pre-sedimentation tank and the guide tube are arranged concentrically, a sludge storage hopper is provided at the bottom center of the sedimentation tank shell, and a sludge discharge port is provided on the lower side wall of the sludge storage hopper. The distance between the bottom of the flat-bottomed conical bucket of the pre-sedimentation tank and the sludge storage hopper of the sedimentation tank shell is not less than 1.5m.

[0010] As a further improvement of the present invention, the guide tube and the sedimentation tank outer shell sidewall are respectively provided with a first connection port and a second connection port. The crystal slurry feed pipe passes through the guide tube and the sedimentation tank outer shell sidewall through the first connection port and the second connection port respectively, and the outer wall of the crystal slurry feed pipe is sealed to the inner wall of the first connection port and the second connection port.

[0011] As a further improvement of the present invention, the stripping pipe includes a vertical pipe and a horizontal ring pipe. The lower end of the vertical pipe is connected to the horizontal ring pipe. The side wall of the horizontal ring pipe is provided with a plurality of sludge suction holes at intervals. The horizontal ring pipe is installed at least 50cm above the bottom surface of the flat-bottomed conical bucket of the pre-sedimentation tank. The horizontal ring pipe and the cylindrical cyclone of the pre-sedimentation tank 2 are arranged with the same center.

[0012] As a further improvement of the present invention, a large-particle crystal collection system is also provided. The stripping pipe also includes a sludge discharge pipe connected to the upper end of the vertical pipe. The sludge discharge pipe can discharge large-particle crystals into the large-particle crystal collection system.

[0013] As a further improvement of the present invention, the suction holes are located directly below the center of the horizontal ring pipe and are distributed in an equidistant array along the extension direction of the horizontal ring pipe.

[0014] As a further improvement of the present invention, a sludge scraper is also installed inside the outer shell of the sedimentation tank, which can scrape the small particles of crystal deposited at the bottom of the outer shell of the sedimentation tank into the sludge storage hopper in the middle of the bottom surface of the outer shell of the sedimentation tank.

[0015] As a further improvement of the present invention, an outlet is provided on the upper side wall of the sedimentation tank shell, and an overflow weir is provided inside the upper part of the sedimentation tank shell, so that the supernatant inside the sedimentation tank shell can overflow through the overflow weir and be discharged from the sedimentation tank shell through the outlet.

[0016] The beneficial technical effects of this invention are as follows: By installing a pre-sedimentation tank, a guide tube, and a stripping device inside the original sedimentation tank shell, the pre-sedimentation tank first concentrates and collects large-particle crystals from the crystal slurry exiting the crystallizer. Small-particle crystals and water flow out of the pre-sedimentation tank and flow downwards along the annular gap between the pre-sedimentation tank and the guide tube into the sedimentation tank shell for sedimentation. The initially concentrated large-particle crystals are discharged from the sedimentation tank by the stripping device for collection, and then dewatered to obtain crystal products. Small-particle crystals are collected from the sedimentation tank shell and returned to the crystallizer to grow again. This completely ensures that the bottom of the sedimentation tank shell is filled with small-particle crystal sludge, completely solving the problem of overload of the sludge scraper located at the bottom of the sedimentation tank shell, ensuring stable crystal production. At the same time, it also selectively collects large-particle crystal products, simultaneously solving the problem of uniform and stable product particle size. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is the front view of the present invention;

[0019] Figure 3 This is a top view of the present invention;

[0020] Figure 4 This is a perspective view of the sedimentation tank shell of the present invention;

[0021] Figure 5 This is a perspective view of the pre-sedimentation tank slurry feed pipe of the present invention;

[0022] Figure 6 This is a perspective view of the guide tube of the present invention;

[0023] Figure 7 This is a perspective view of the stripping pipe of the present invention;

[0024] Figure 8 for Figure 7 Enlarged view of section A. Detailed Implementation

[0025] 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.

[0026] Example: A crystal selective crystal removal combined sedimentation tank includes a sedimentation tank shell 1, a pre-sedimentation tank 2, a crystal slurry feed pipe 5, and a stripping device. The pre-sedimentation tank 2 is fixedly installed inside the sedimentation tank shell 1. The discharge end 51 of the crystal slurry feed pipe 5 is connected to the upper end of the pre-sedimentation tank 2. The pre-sedimentation tank 2 can separate large and small crystal particles in the crystal slurry and discharge the small crystal particles and water into the sedimentation tank shell 1. The stripping device includes a stripping pipe 4 and a high-pressure gas supply device. The lower end of the stripping pipe 4 extends into the pre-sedimentation tank 2, and the upper end of the stripping pipe 4 extends to the outside of the sedimentation tank shell 1. The high-pressure gas supply device provides high-pressure gas flowing from bottom to top to the stripping pipe 4. The lower end of the stripping pipe 4 can discharge the large crystal particles separated in the pre-sedimentation tank 2 to a designated position under the action of stripping suction.

[0027] The outer shell 1 of the sedimentation tank can be a traditional sedimentation tank. A pre-sedimentation tank 2, a crystal slurry feed pipe 5, and a stripping device are installed in the traditional sedimentation tank. The crystal slurry flowing out of the crystallizer enters the pre-sedimentation tank 2 along the crystal slurry feed pipe 5. Large crystal particles in the crystal slurry are separated in the pre-sedimentation tank 2. Small crystal particles and water in the crystal slurry are discharged from the pre-sedimentation tank 2 into the outer shell 1 of the sedimentation tank. Large crystal particles are discharged from the sedimentation tank by the stripping pipe 4 under the action of stripping suction, and are collected and dewatered into crystal products. Small crystal particles settle in the outer shell 1 of the sedimentation tank and then flow back to the crystallizer to grow again. In this way, on the one hand, the bottom of the sedimentation tank shell is full of small crystal sludge, which completely solves the problem of overload of the sedimentation tank shell scraper and ensures stable crystal production. On the other hand, it can also selectively collect large crystal products, and simultaneously solve the problem of uniform and stable product particle size.

[0028] The pre-sedimentation tank 2 is a cylindrical structure with an open top and a closed bottom. Its upper section is a cylindrical vortex 21, and its lower section is a flat-bottomed conical bucket bottom 22 with an upper diameter larger than the lower diameter. The crystal slurry feed pipe 5 is rotary-cut to the side wall of the cylindrical vortex 21 in the upper section of the pre-sedimentation tank 2, and the lower end of the stripping pipe 4 extends into the flat-bottomed conical bucket bottom 22.

[0029] The crystal slurry is injected into the cylindrical cyclone 21 of the pre-sedimentation tank 2 through the crystal slurry feed pipe 5. Large crystal particles in the slurry undergo a spiral motion along the inner wall of the cylindrical cyclone 21 and are eventually stored in the bottom of the flat-bottomed conical bucket 22. Small crystal particles and water leave the pre-sedimentation tank 2 through the opening at the top of the cylindrical cyclone bucket. The rapid separation of large and small crystal particles is achieved through swirling, preventing large crystal particles from entering the sedimentation tank shell. Furthermore, the flat-bottomed conical bucket 22 in the lower section of the pre-sedimentation tank 2 allows for rapid deposition and aggregation of large crystal particles, facilitating timely removal of large crystal particles by the stripping pipe 4. Alternatively, other methods can be used to separate large and small crystal particles, prevent large crystal particles from entering the sedimentation tank shell, and collect large crystal particles, such as using a screen. This is an equivalent replacement structure that is easily conceived by those skilled in the art based on this patent and falls within the scope of protection of this patent.

[0030] A guide tube 3 is also fixedly installed inside the outer shell 1 of the sedimentation tank. The guide tube 3 is sleeved on the outer side of the upper end of the pre-sedimentation tank 2, and an annular gap is formed between the inner wall of the guide tube 3 and the outer wall of the pre-sedimentation tank 2. The upper end of the guide tube 3 is higher than the liquid level in the outer shell 1 of the sedimentation tank, and the lower end of the guide tube 3 is lower than the discharge end 51 of the crystal slurry inlet pipe 5. The lower end of the guide tube 3 is higher than the connection point between the bottom of the flat-bottomed conical bucket 22 and the cylindrical vortex tube 21. By sleeved a guide tube 3 on the outer side of the upper end of the pre-sedimentation tank 2, the small crystal particles and water discharged from the open end of the pre-sedimentation tank 2 can flow downward along the annular gap between the guide tube 3 and the pre-sedimentation tank 2, preventing the small crystal particles from being discharged from the outer shell 1 of the sedimentation tank without sedimentation. At the same time, it can make the small crystal particles mainly concentrated in the center of the outer shell 1 of the sedimentation tank, which is convenient for rapid collection.

[0031] The sedimentation tank shell 1, the pre-sedimentation tank 2 and the guide tube 3 are arranged concentrically. The sedimentation tank shell 1 has a sludge storage hopper 11 at the bottom center. The sludge storage hopper 11 has a sludge discharge port 12 on the lower side wall. The distance between the flat bottom cone bucket bottom 22 of the pre-sedimentation tank 2 and the sludge storage hopper 11 of the sedimentation tank shell 1 is not less than 1.5m.

[0032] Ideally, the bottom of the sedimentation tank shell 1 should be designed as a cone shape, which allows small crystal particles to move quickly toward the sludge hopper 11 for easy collection. Sufficient distance should be left between the bottom of the pre-sedimentation tank 2 and the sludge hopper 11 to facilitate the accumulation and storage of small crystal particles.

[0033] The guide tube 3 and the sedimentation tank shell 1 are respectively provided with a first connection port 31 and a second connection port 13 on their side walls. The crystal slurry feed pipe 5 penetrates the guide tube 3 and the side wall of the sedimentation tank shell 1 through the first connection port 31 and the second connection port 13 respectively, and the outer wall of the crystal slurry feed pipe 5 is sealed to the inner wall of the first connection port 31 and the second connection port 13. The crystal slurry feed pipe 5 enters the pre-sedimentation tank 2 in a horizontal state to spray crystal slurry, so that the crystal slurry enters the pre-sedimentation tank 2 rapidly in a swirling state.

[0034] The stripping pipe 4 includes a vertical pipe 41 and a horizontal ring pipe 42. The lower end of the vertical pipe 41 is connected to the horizontal ring pipe 42. The side wall of the horizontal ring pipe 42 is provided with a plurality of sludge suction holes 43 at intervals. The horizontal ring pipe 42 is placed at least 50cm above the bottom surface of the flat-bottomed conical bucket bottom 22 of the pre-sedimentation tank 2. The horizontal ring pipe 42 and the cylindrical swirl tube 21 of the pre-sedimentation tank 22 are arranged concentrically.

[0035] The lower end of the stripping pipe 4 absorbs the large crystal particles deposited at the bottom of the pre-sedimentation tank 2 quickly and fully through the horizontal ring pipe 42, and then lifts them upward and discharges them through the vertical pipe 41. This can prevent large crystal particles from not being discharged from the pre-sedimentation tank 2 in time and thus causing them to agglomerate.

[0036] It also includes a large-particle crystal collection system. The stripping pipe 4 also includes a sludge discharge pipe connected to the upper end of the vertical pipe 41. The sludge discharge pipe can discharge large-particle crystals into the large-particle crystal collection system. The large-particle crystals discharged from the stripping device enter the large-particle crystal collection system for centralized collection and dehydration to form crystal products.

[0037] The suction holes 43 are located directly below the core of the horizontal ring pipe 42 and are distributed in an equidistant array along the extension direction of the horizontal ring pipe 42 to achieve uniform adsorption of large-particle crystals at the bottom of the pre-sedimentation tank 2.

[0038] A sludge scraper is also installed inside the outer shell 1 of the sedimentation tank. The sludge scraper can scrape the small crystalline particles deposited at the bottom of the outer shell 1 into the sludge storage hopper 11 in the middle of the bottom surface of the outer shell 1. Installing a sludge scraper inside the outer shell 1 can scrape the small crystalline particles deposited at the bottom of the outer shell 1 and collect them into the sludge storage hopper 11. Since the sedimentation tank outer shell 1 only contains small crystalline particles, it will not cause overload failure of the sludge scraper.

[0039] The sedimentation tank shell 1 has an outlet 14 on the upper side wall and an overflow weir 15 inside the upper part of the sedimentation tank shell 1. The supernatant in the sedimentation tank shell 1 can overflow through the overflow weir 15 and be discharged from the sedimentation tank shell 1 through the outlet 14. The sedimentation tank shell 1 can prevent small crystal particles from being discharged with the water through the overflow weir 15, so that the content of small crystal particles in the supernatant discharged from the outlet 14 is extremely low.

Claims

1. A crystal selective crystal-sorting combined precipitation tank, characterized in that: The system includes a sedimentation tank shell (1), a pre-sedimentation tank (2), a crystal slurry feed pipe (5), and a stripping device. The pre-sedimentation tank is fixedly installed inside the sedimentation tank shell. The discharge end (51) of the crystal slurry feed pipe is connected to the upper end of the pre-sedimentation tank. The pre-sedimentation tank can separate large and small crystal particles in the crystal slurry and discharge the small crystal particles and water into the sedimentation tank shell. The stripping device includes a stripping pipe (4) and a high-pressure gas supply device. The lower end of the stripping pipe extends into the pre-sedimentation tank, and the upper end of the stripping pipe extends to the outside of the sedimentation tank shell. The high-pressure gas supply device provides high-pressure gas flowing from bottom to top to the stripping pipe. The lower end of the stripping pipe can discharge the large crystal particles separated in the pre-sedimentation tank to a designated position under the action of stripping suction.

2. The crystal selective crystal-sorting combined precipitation tank according to claim 1, characterized in that: The pre-sedimentation tank is a cylindrical structure with an open top and a closed bottom. Its upper section is a cylindrical cyclone (21), and its lower section is a flat-bottomed conical bucket bottom (22) with an upper diameter larger than the lower diameter. The crystal slurry feed pipe is rotary cut to the side wall of the cylindrical cyclone in the upper section of the pre-sedimentation tank, and the lower end of the stripping pipe extends into the flat-bottomed conical bucket bottom.

3. The crystal selective crystal-sorting combined precipitation tank according to claim 2, characterized in that: A guide tube (3) is also fixedly installed inside the outer shell of the sedimentation tank. The guide tube is sleeved on the outer side of the upper end of the pre-sedimentation tank, and an annular gap is formed between the inner side wall of the guide tube and the outer side wall of the pre-sedimentation tank. The upper end of the guide tube is higher than the liquid level of the outer shell of the sedimentation tank, the lower end of the guide tube is lower than the discharge end of the crystal slurry feed pipe, and the lower end of the guide tube is higher than the connection position between the bottom of the flat-bottomed conical bucket and the cylindrical vortex tube.

4. The crystal selective crystal-sorting combined precipitation tank according to claim 3, characterized in that: The sedimentation tank shell, the pre-sedimentation tank and the guide tube are arranged concentrically. A sludge storage hopper (11) is provided at the bottom center of the sedimentation tank shell. A sludge discharge port (12) is provided on the lower side wall of the sludge storage hopper. The distance between the bottom of the flat-bottomed conical bucket of the pre-sedimentation tank and the sludge storage hopper of the sedimentation tank shell is not less than 1.5m.

5. The crystal selective crystal-sorting combined precipitation tank according to claim 4, characterized in that: The guide tube and the sedimentation tank shell sidewall are respectively provided with a first connection port (31) and a second connection port (13). The crystal slurry feed pipe passes through the guide tube and the sedimentation tank shell sidewall through the first connection port and the second connection port respectively, and the outer wall of the crystal slurry feed pipe is sealed to the inner wall of the first connection port and the second connection port.

6. The crystal selective crystal-sorting combined precipitation tank according to claim 5, characterized in that: The stripping pipe includes a vertical pipe (41) and a horizontal ring pipe (42). The lower end of the vertical pipe is connected to the horizontal ring pipe. Several sludge suction holes (43) are provided at intervals on the side wall of the horizontal ring pipe. The horizontal ring pipe is built into the bottom surface of the flat-bottomed conical bucket of the pre-sedimentation tank at a position not less than 50cm above the bottom surface. The horizontal ring pipe and the cylindrical cyclone of the pre-sedimentation tank 2 are arranged with the same center.

7. The crystal selective crystal removal combined sedimentation tank according to claim 6, characterized in that: it is further provided with a large particle crystal collection system, and the stripping pipe further includes a sludge discharge pipe connected to the upper end of the vertical pipe, the sludge discharge pipe being able to discharge large particle crystals into the large particle crystal collection system.

8. The crystal selective crystal-sorting combined precipitation tank according to claim 6, characterized in that: The suction holes are located directly below the center of the horizontal ring pipe and are distributed in an equidistant array along the extension direction of the horizontal ring pipe.

9. The crystal selective crystal-sorting combined precipitation tank according to claim 4, characterized in that: The sedimentation tank shell is also equipped with a sludge scraper, which can scrape the small particles of crystals deposited at the bottom of the sedimentation tank shell into the sludge storage hopper in the middle of the bottom surface of the sedimentation tank shell.

10. The crystal selective crystal-sorting combined precipitation tank according to claim 1, characterized in that: The sedimentation tank shell has an outlet (14) on the upper side wall and an overflow weir (15) inside the upper part of the sedimentation tank shell. The supernatant inside the sedimentation tank shell can overflow through the overflow weir and be discharged from the sedimentation tank shell through the outlet.

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