A high-salinity wastewater treatment system using fly ash as medium
By using fly ash as a medium, a high-salt wastewater treatment system was developed. By utilizing flue gas drying and humidity control, the problem of crystallization and scaling in the hot flue gas device was solved, and efficient high-salt wastewater treatment was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-04
- Publication Date
- 2026-03-31
AI Technical Summary
Existing hot flue gas high-salt wastewater treatment devices suffer from crystallization and scaling problems, which affect the stable operation and output of the equipment and limit its widespread adoption.
The high-salt wastewater treatment system using fly ash as the medium transports wet ash to a feeder via a conveyor, uses flue gas to dry the fly ash, and controls the humidity in the wet ash bin within a set range through a feeder and water supply pipeline to prevent crystallization and scaling.
It improves the treatment efficiency of high-salinity wastewater, avoids crystallization and scaling on the equipment surface, and ensures the stable operation of the system.
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Figure CN117735648B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wastewater treatment technology, specifically to a high-salt wastewater treatment system using fly ash as a medium. Background Technology
[0002] Industrial production generates large amounts of high-salinity wastewater, which can cause significant environmental pollution if discharged directly. High-salinity wastewater treatment is among the most challenging wastewater treatment methods, primarily because highly concentrated brine readily crystallizes. Consequently, current hot flue gas drying processes suffer from crystallization and scaling problems, severely impacting equipment stability and output. This limits the widespread adoption of hot flue gas-based high-salinity wastewater treatment devices.
[0003] Therefore, there is an urgent need for a high-salt wastewater treatment system that uses fly ash as a medium to solve the above problems. Summary of the Invention
[0004] The purpose of this invention is to solve the problem that crystallization and scaling in existing high-salt wastewater treatment devices based on hot flue gas affect the stable operation and output of the equipment, and to provide a high-salt wastewater treatment system using fly ash as the medium.
[0005] To achieve the above objectives, the present invention provides a high-salinity wastewater treatment system using fly ash as a medium, the high-salinity wastewater treatment system using fly ash as a medium includes a conveyor, a feeder, a flue gas pipeline, a wet ash silo, a feeder, and a water supply pipeline.
[0006] The feed inlet of the conveyor is connected to the discharge outlet of the wet ash silo, and is used to transport the material inside the wet ash silo to the feeder. The feeder is located at the inner top of the flue gas pipeline. The flue gas pipeline is located at the inner bottom below the feeder and is connected to the feed inlet of the wet ash silo. The flue gas pipeline has an air inlet and an air outlet on opposite sides. The feeder and the water supply pipeline are used to supply material and water to the wet ash silo, respectively.
[0007] Preferably, the wet ash silo is equipped with a material moisture meter, which is used to work in conjunction with the feeder and the water supply pipeline to ensure that the material moisture content in the wet ash silo is less than 15%.
[0008] Preferably, a hopper and a screw feeder are connected sequentially between the inner bottom of the flue gas pipeline and the feed inlet of the wet ash silo.
[0009] Preferably, the material discharge slope of the hopper is greater than 60°.
[0010] Preferably, the conveyor includes a conveying channel and a sprocket conveying mechanism disposed inside the conveying channel. The sprocket conveying mechanism is provided with a plurality of scrapers at preset intervals. The conveying channel is provided with a discharge port at one end above the feeder and a feed port at the other end below the wet ash silo.
[0011] Preferably, both the feed inlet and the discharge outlet of the conveyor are provided with rebound baffles. The rebound baffles include a fixed plate and a movable baffle. The fixed plate and the movable baffle are connected by a rotating shaft, and a telescopic spring is also connected to the inner side of the two. The fixed plate is fixedly connected to the inner side wall of the conveying channel. The movable baffle is positioned towards the sprocket conveying mechanism and its length is greater than the distance d between the scraper and the conveying channel.
[0012] Preferably, a star-shaped feeder is provided at the discharge port of the wet ash silo.
[0013] Preferably, the discharge port of the conveyor is connected to a wet ash chute, and the discharge port of the wet ash chute extends above at least one of the feeders.
[0014] Preferably, the feeder includes a disc and a motor for driving the disc to rotate. The disc has several vertical ribs on its inner side, which are used to throw the material into the flue gas pipeline under the action of centrifugal force when the disc rotates.
[0015] Preferably, the diameter of the disk is 0.5-2.5m, and the rotation speed of the disk is 1-25r / min.
[0016] According to the above technical solution, based on this high-salt wastewater treatment system using fly ash as a medium, the feed inlet of the conveyor is connected to the discharge outlet of the wet ash silo to transport the fly ash inside the wet ash silo to the feeder. The feeder throws the material into the flue gas pipeline, and then the flue gas dries the fly ash with a set moisture content thrown into the flue gas pipeline. The dried fly ash is discharged from the flue gas pipeline outlet with the flue gas, while most of it falls into the wet ash silo. The feeder and the water supply pipeline are used to replenish fly ash and / or water into the wet ash silo, respectively, so that the moisture content of the fly ash in the wet ash silo is always within the set range. Thus, by using fly ash as a medium, the treatment efficiency of high-salt wastewater is effectively improved without causing crystallization and scaling on the equipment surface.
[0017] Meanwhile, by installing a material humidity measuring device inside the wet ash silo, which is linked with the feeder and the water supply pipeline, the humidity of the material inside the wet ash silo is kept below 15%. In practical applications, this can effectively improve the treatment efficiency of high-salt wastewater.
[0018] A hopper and a screw feeder are sequentially connected between the bottom of the flue gas pipeline and the inlet of the wet ash silo. The hopper has a drop slope of more than 60°, which allows the dried fly ash to fall quickly into the wet ash silo, thereby improving the treatment efficiency of high-salt wastewater.
[0019] The feed inlet and outlet of the conveyor are both equipped with rebound baffles, and the movable baffles of the rebound baffles are positioned towards the sprocket conveying mechanism and their length is greater than the distance d between the scraper and the conveying channel. This can prevent wet fly ash from falling into the conveyor during the loading and unloading of fly ash, and at the same time improve the conveying efficiency of wet fly ash, thereby improving the treatment efficiency of high-salt wastewater.
[0020] By configuring the feeder to include a disc and a motor for driving the disc to rotate, with several vertical ribs provided on the inner side of the disc, the diameter of the disc being 0.5-2.5m, and the rotation speed of the disc being 1-25r / min, the material can be thrown into the flue gas pipeline under the action of centrifugal force when the disc rotates, thereby improving the drying, evaporation, and crystallization efficiency of the flue gas on wet fly ash. Attached Figure Description
[0021] Figure 1 This is a front view of a high-salt wastewater treatment system using fly ash as the medium.
[0022] Figure 2 This is a side view of a high-salt wastewater treatment system using fly ash as the medium.
[0023] Figure 3 This is a top view of a high-salt wastewater treatment system using fly ash as the medium.
[0024] Figure 4 This is a schematic diagram of the rebound baffle.
[0025] Figure 5 This is a schematic diagram showing the distance d between the scraper and the material conveying channel;
[0026] Figure 6 This is a three-dimensional structural diagram of a high-salt wastewater treatment system using fly ash as the medium.
[0027] Explanation of reference numerals in the attached figures
[0028] 1. Conveyor; 2. Feeder; 3. Air outlet; 4. Drop hopper; 5. Screw feeder; 6. Wet ash silo; 7. Feeder; 8. Feed inlet; 9. Water supply pipeline; 10. Air inlet; 11. Flue gas pipeline; 12. Rotary star feeder; 13. Rebound baffle; 14. Wet ash chute; 15. Movable baffle; 16. Rotating shaft; 17. Telescopic spring; 18. Fixed plate; 19. Conveying channel; 20. Sprocket conveyor mechanism; 21. Scraper. Detailed Implementation
[0029] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.
[0030] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of indicated technical features. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean a non-exclusive inclusion, the possibility of the presence or addition of one or more other features, units, components, and / or combinations thereof.
[0031] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0032] This invention provides a high-salinity wastewater treatment system using fly ash as a medium, such as... Figure 1-6 As shown, the high-salt wastewater treatment system using fly ash as a medium includes a conveyor 1, a feeder 2, a flue gas pipeline 11, a wet ash silo 6, a feeder 7, and a water supply pipeline 9.
[0033] The feed inlet of the conveyor 1 is connected to the discharge outlet of the wet ash silo 6, and is used to convey the material inside the wet ash silo 6 to the feeder 2. The feeder 2 is located at the inner top of the flue gas pipeline 11. The inner bottom of the flue gas pipeline 11, located below the feeder 2, is connected to the feed inlet of the wet ash silo 6. The opposite sides of the flue gas pipeline 11 are respectively provided with an air inlet 10 and an air outlet 3. The feeder 7 and the water supply pipeline 9 are used to replenish material and water into the wet ash silo 6, respectively.
[0034] According to the above technical solution, based on this high-salt wastewater treatment system using fly ash as a medium, the feed inlet of the conveyor is connected to the discharge outlet of the wet ash silo to transport the fly ash inside the wet ash silo to the feeder. The feeder throws the material into the flue gas pipeline, and then the flue gas dries the fly ash with a set moisture content thrown into the flue gas pipeline. The dried fly ash is discharged from the flue gas pipeline outlet with the flue gas, while most of it falls into the wet ash silo. The feeder and the water supply pipeline are used to replenish fly ash and / or water into the wet ash silo, respectively, so that the moisture content of the fly ash in the wet ash silo is always within the set range. Thus, by using fly ash as a medium, the treatment efficiency of high-salt wastewater is effectively improved without causing crystallization and scaling on the equipment surface.
[0035] In the high-salt wastewater treatment system using fly ash as a medium according to the present invention, in a preferred embodiment, the conveyor 1 includes a conveying channel 19 and a sprocket conveying mechanism 20 disposed inside the conveying channel 19. The sprocket conveying mechanism 20 is provided with a plurality of scrapers 21 at preset intervals. The conveying channel 19 is provided with a discharge port at one end above the feeder 2 and a feed port at the other end below the wet ash silo 6.
[0036] In a further preferred embodiment, both the feed inlet and the discharge outlet of the feeder 1 are provided with rebound baffles 13. The rebound baffles 13 include a fixed plate 18 and a movable baffle 15. The fixed plate 18 and the movable baffle 15 are connected by a rotating shaft 16, and a telescopic spring 17 is also connected to the inner side of the two. The fixed plate 18 is fixedly connected to the inner side wall of the feed channel 19. The movable baffle 15 is positioned towards the sprocket conveying mechanism 20 and its length is greater than the distance d between the scraper 21 and the feed channel 19.
[0037] In this invention, such as Figure 2 , 4 As shown in Figure 5, by further providing rebound baffles 13 at both the inlet and outlet of the conveyor 1, and the movable baffle 15 of the rebound baffle 13 being positioned toward the sprocket conveying mechanism 20 and having a length greater than the distance d between the scraper 21 and the conveying channel 19, in practical applications, wet fly ash can be prevented from falling into the conveyor during loading and unloading of fly ash, while improving the conveying efficiency of wet fly ash, thereby improving the treatment efficiency of high-salt wastewater.
[0038] In a more preferred embodiment, a star feeder 12 is provided at the discharge port of the wet ash silo 6, so that wet fly ash can quickly enter the conveying channel 19, thereby improving the treatment efficiency of high-salt wastewater by improving the overall operating efficiency of the system.
[0039] In one specific embodiment, the discharge port of the conveyor 1 is connected to a wet ash chute 14, the discharge port of the wet ash chute 14 extending above at least one of the feeders 2, thereby enabling the wet fly ash to enter the feeder 2 better based on the wet ash chute 14, and thus better dry, evaporate and crystallize the wet fly ash.
[0040] In the high-salt wastewater treatment system using fly ash as a medium according to the present invention, in a preferred embodiment, the feeder 2 includes a disc and a motor for driving the disc to rotate. The disc is provided with several vertical ribs on its inner side, which are used to throw the material into the flue gas pipeline 11 under the action of centrifugal force when the disc rotates.
[0041] In a further preferred embodiment, the diameter of the disk is 0.5-2.5m, preferably 1-2m, and the rotation speed of the disk is 1-25r / min, preferably 5-20r / min, and more preferably 10-16r / min.
[0042] In this invention, by further designing the specific structure of the feeder 2, and limiting the diameter of the disc to 0.5-2.5m and the rotation speed of the disc to 1-25r / min, in practical applications, the material can be thrown into the flue gas pipeline under the action of centrifugal force when the disc rotates, thereby improving the drying, evaporation and crystallization efficiency of the flue gas on wet fly ash.
[0043] In the high-salinity wastewater treatment system using fly ash as a medium according to the present invention, preferably, a material moisture meter is installed in the wet ash silo 6, which is used to work in conjunction with the feeder 7 and the water supply pipeline 9 to ensure that the material moisture content in the wet ash silo 6 is less than 15%, preferably 12%. In practical applications, this can further effectively improve the treatment efficiency of high-salinity wastewater and prevent the high moisture content of wet fly ash from affecting the overall operating efficiency of the system and thus the treatment efficiency of high-salinity wastewater. In a specific embodiment, based on the wet fly ash content in the wet ash silo 6 measured in real time by the material moisture meter, the water supply device is controlled to supply water through the water supply pipeline 9 and / or the feeder 7 is controlled to supply fly ash through the feed inlet 8, so that the moisture content of the wet fly ash in the wet ash silo 6 is always less than 12%. In a specific embodiment, the feeder 7 is a screw feeder, thereby improving the feeding accuracy.
[0044] In the high-salinity wastewater treatment system using fly ash as a medium according to the present invention, preferably, a hopper 4 and a screw feeder 5 are sequentially connected between the inner bottom of the flue gas pipeline 11 and the feed inlet of the wet ash silo 6. In a specific embodiment, the hopper 4 and the screw feeder 5 can be an integral feeding mechanism, so at least one feeding mechanism can be provided between the inner bottom of the flue gas pipeline 11 and the feed inlet of the wet ash silo 6, preferably two feeding mechanisms.
[0045] In a further preferred embodiment, the material discharge slope of the hopper 4 is greater than 60°, preferably 60-90°, and more preferably 65-80°.
[0046] In this invention, by further designing the inner bottom of the flue gas pipeline 11 to be connected in sequence with the feed inlet of the wet ash bin 6, a hopper 4 and a screw feeder 5 are connected. The hopper 4 has a discharge slope of more than 60°, which allows the dried fly ash to fall quickly into the wet ash bin 6, thereby improving the treatment efficiency of high-salt wastewater.
[0047] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.
[0048] Example 1
[0049] Adopting such Figure 1-5 The high-salt wastewater treatment system using fly ash as a medium shown is implemented as follows: Specifically, the high-salt wastewater treatment system using fly ash as a medium includes a conveyor 1, a feeder 2, a flue gas pipeline 11, a wet ash silo 6, a feeder 7, and a water supply pipeline 9.
[0050] The feed inlet of the conveyor 1 is connected to the discharge outlet of the wet ash silo 6, and is used to convey the material inside the wet ash silo 6 to the feeder 2. The feeder 2 is located at the inner top of the flue gas pipeline 11. The inner bottom of the flue gas pipeline 11 is located below the feeder 2 and is connected to the feed inlet of the wet ash silo 6. The opposite sides of the flue gas pipeline 11 are respectively provided with an air inlet 10 and an air outlet 3. The feeder 7 and the water supply pipeline 9 are used to supply material and water to the wet ash silo 6, respectively.
[0051] The conveyor 1 includes a conveying channel 19 and a sprocket conveying mechanism 20 disposed inside the conveying channel 19. The sprocket conveying mechanism 20 is provided with a plurality of scrapers 21 at preset intervals. The conveying channel 19 has a discharge port at one end above the feeder 2 and a feed port at the other end below the wet ash hopper 6. The discharge port of the conveyor 1 is connected to a wet ash chute 14, and the discharge port of the wet ash chute 14 extends above at least one feeder 2.
[0052] The feed inlet and outlet of the conveyor 1 are both equipped with rebound baffles 13. The rebound baffle 13 includes a fixed plate 18 and a movable baffle 15. The fixed plate 18 and the movable baffle 15 are connected by a rotating shaft 16, and a telescopic spring 17 is also connected to the inner side of the two. The fixed plate 18 is fixedly connected to the inner side wall of the conveying channel 19. The movable baffle 15 is positioned towards the sprocket conveying mechanism 20 and its length is greater than the distance d between the scraper 21 and the conveying channel 19. A star feeder 12 is provided at the outlet of the wet ash silo 6.
[0053] The feeder 2 includes a disc and a motor for driving the disc to rotate. The disc has several vertical ribs on its inner side, which are used to throw the material into the flue gas pipeline 11 under the action of centrifugal force when the disc rotates. The diameter of the disc is 1.5m and the rotation speed of the disc is 15r / min.
[0054] In practical applications, the wet fly ash inside the wet ash bin 6 is continuously conveyed to the feeder 2 by the feeder 1. The feeder 2 throws the wet fly ash into the flue gas pipeline 11. Then, the flue gas continuously entering from the inlet 10 dries the fly ash with the set moisture content thrown into the flue gas pipeline 11. As a result, some of the dried fly ash is discharged from the outlet 3 of the flue gas pipeline 11 with the flue gas, while most of it falls into the wet ash bin 6. Then, fly ash and / or water are added to the wet ash bin 6 by the feeder 7 and the water supply pipeline 9, respectively, so that the moisture content of the fly ash in the wet ash bin 6 is always within the set range.
[0055] Testing has shown that the high-salt wastewater treatment system using fly ash as a medium, as described in this invention, can effectively improve the treatment efficiency of high-salt wastewater without causing crystallization and scaling on the equipment surface.
[0056] Example 2
[0057] The implementation follows the same procedure as Example 1, except that a material humidity measuring device is installed in the wet ash silo 6, which is used to work in conjunction with the feeder 7 and the water supply pipeline 9 to make the material humidity in the wet ash silo 6 10%.
[0058] Testing has shown that the high-salt wastewater treatment system using fly ash as a medium, as described in this invention, can further improve the treatment efficiency of high-salt wastewater without causing crystallization and scaling on the equipment surface.
[0059] Example 3
[0060] The implementation follows the same procedure as Example 2, except that a hopper 4 and a screw feeder 5 are sequentially connected between the inner bottom of the flue gas pipeline 11 and the feed inlet of the wet ash bin 6, and the discharge slope of the hopper 4 is 70°.
[0061] Testing has shown that the high-salt wastewater treatment system using fly ash as a medium, as described in this invention, can further improve the treatment efficiency of high-salt wastewater without causing crystallization and scaling on the equipment surface.
[0062] The high-salt wastewater treatment system using fly ash as a medium provided by this invention connects the inlet of the conveyor to the outlet of the wet ash silo, which is used to transport the fly ash inside the wet ash silo to the feeder. The feeder throws the material into the flue gas pipeline, and then the flue gas dries the fly ash with a set moisture content. After drying, some of the fly ash is discharged from the outlet of the flue gas pipeline with the flue gas, while most of it falls into the wet ash silo. The feeder and the water supply pipeline are used to replenish fly ash and / or water into the wet ash silo, respectively, so that the moisture content of the fly ash in the wet ash silo is always within the set range. Thus, by using fly ash as a medium, the treatment efficiency of high-salt wastewater is effectively improved without causing crystallization and scaling on the equipment surface.
[0063] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.
Claims
1. A high-salinity wastewater treatment system using fly ash as a medium, characterized by, The high-salt wastewater treatment system with fly ash as medium comprises a feeder (1), a material shifter (2), a flue gas pipeline (11), a wet ash bin (6), a material supplementing machine (7) and a water supplementing pipeline (9); The feeding port of the feeder (1) is connected with the discharging port of the wet ash bin (6), and is used for conveying the material in the wet ash bin (6) to the material shifter (2); the material shifter (2) is arranged at the inner top of the flue gas pipeline (11); the flue gas pipeline (11) is connected with the feeding port of the wet ash bin (6) at the inner bottom below the material shifter (2); the opposite sides of the flue gas pipeline (11) are respectively provided with an air inlet (10) and an air outlet (3); and the material supplementing machine (7) and the water supplementing pipeline (9) are respectively used for supplementing material and water into the wet ash bin (6). A material humidity measurer is arranged in the wet ash bin (6), and is used for linking with the material supplementing machine (7) and the water supplementing pipeline (9) to make the material humidity in the wet ash bin (6) less than 15%. The feeder (1) comprises a material conveying channel (19) and a chain wheel conveying mechanism (20) arranged in the material conveying channel (19); a plurality of scrapers (21) are arranged on the chain wheel conveying mechanism (20) at a preset interval; one end of the material conveying channel (19) above the material shifter (2) is provided with a discharging port; and one end of the material conveying channel (19) below the wet ash bin (6) is provided with a feeding port. The feeding port and the discharging port of the feeder (1) are respectively provided with a rebound baffle (13); the rebound baffle (13) comprises a fixed plate (18) and a movable baffle (15); the fixed plate (18) and the movable baffle (15) are connected through a rotating shaft (16) and are further connected with an extension spring (17) on the inner side between the fixed plate (18) and the movable baffle (15); the fixed plate (18) is fixedly connected with the inner side wall of the material conveying channel (19); the movable baffle (15) is arranged towards the chain wheel conveying mechanism (20) and has a length greater than the distance d between the scraper (21) and the material conveying channel (19).
2. The fly ash mediated high salinity wastewater treatment system of claim 1, wherein, The inner bottom of the flue gas pipeline (11) and the feeding port of the wet ash bin (6) are sequentially connected with a material falling hopper (4) and a screw feeder (5).
3. The fly ash mediated high salinity wastewater treatment system of claim 2, wherein, The material falling slope of the material falling hopper (4) is greater than 60°.
4. The fly ash mediated high salinity wastewater treatment system of claim 1, wherein, A star feeder (12) is arranged at the discharging port of the wet ash bin (6).
5. The fly ash mediated high salinity wastewater treatment system of claim 1, wherein, The discharging port of the feeder (1) is connected with a wet ash chute (14), and the discharging port of the wet ash chute (14) extends to above at least one material shifter (2).
6. The fly ash mediated high salinity wastewater treatment system of claim 1, wherein, The material shifter (2) comprises a disc and a motor for driving the disc to rotate; a plurality of vertical ribs are arranged on the inner side of the disc, and are used for throwing the material into the flue gas pipeline (11) under the action of centrifugal force when the disc rotates.
7. The fly ash mediated high salinity wastewater treatment system of claim 6, wherein, The diameter of the disc is 0.5-2.5 m, and the rotating speed of the disc is 1-25 r / min.
Citation Information
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