A continuous sewage silica flocculation recovery device

Abstract

The utility model provides a kind of continuous sewage silicon dioxide flocculation recovery device, it is related to water treatment technical field, including expansion tank, the middle part of expansion tank is provided with partition baffle, the partition baffle is divided into flash chamber and flocculation chamber in expansion tank, the side wall middle part of flash chamber is connected with water inlet, the water inlet is connected with shower head assembly inside, the top of flash chamber is provided with plate heat exchanger, flocculation tank is fixedly installed in flocculation chamber, several aluminum base electrode plates are installed in flocculation tank, driving shaft is rotatably connected in the middle part of flocculation tank, driving motor is fixed in the top of flocculation tank, the output end of driving motor is connected in driving shaft top, several stirring scrapers are installed on driving shaft.The utility model is in by being arranged cooling section in expansion tank, the wastewater that enters into flocculation tank is kept in suitable flocculation temperature range, avoid the corrosion of high temperature to aluminum base electrode plate.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a device for the coagulation and recovery of silica from continuously discharged sewage. Background Technology

[0002] Silica is one of the substances most prone to forming hard scale in boiler water, especially under high temperature and pressure conditions. Silica scale has extremely low thermal conductivity, severely hindering heat transfer. The main method for controlling the silica content in boiler water is continuous blowdown. The higher the silica content, the greater the required blowdown rate. Blowdown wastewater is typically very hot, and direct discharge results in significant energy loss and water waste. Recovered silica or silicates are valuable resources that can be used in building materials, chemical raw materials, and other industries, achieving the recycling of silica resources, aligning with the concept of sustainable development, reducing raw material procurement costs, and even creating additional revenue.

[0003] The silica electrocoagulation device is a method for efficiently removing dissolved silica from water using electrochemical action. Its core principle is to generate flocculants by electrolyzing consumable metal anodes, and then combine this with electrochemical reactions to achieve the destabilization, coagulation, and separation of silica, thereby enabling the recycling of silica.

[0004] However, the boiler drain temperature usually exceeds 100℃. In high-temperature environments, the corrosion and coating peeling of electrode materials are accelerated, causing the electrode materials to fail faster. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a continuous wastewater silica flocculation and recovery device, which solves the problems mentioned in the background section.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A silica flocculation and recovery device for continuous wastewater discharge includes an expansion tank. A partition baffle is provided in the middle of the expansion tank, dividing the tank into a flash chamber and a flocculation chamber arranged vertically. An inlet is connected to the middle of the side wall of the flash chamber, and a nozzle assembly is connected inside the inlet. An exhaust port is connected to the top of the flash chamber, and a plate heat exchanger is installed at the top of the flash chamber. The heat exchanger tubes of the plate heat exchanger are connected to the outside of the expansion tank. A flocculation tank is fixedly installed inside the flocculation chamber. An inlet is connected to the upper side wall of the flocculation tank, and an outlet is connected to the lower side wall of the flocculation tank. Several aluminum-based electrode plates are installed inside the flocculation tank. A drive shaft is rotatably connected to the middle of the flocculation tank, and a drive motor is fixed to the top of the flocculation tank. The output end of the drive motor is connected to the top of the drive shaft, and several stirring scrapers are installed on the drive shaft.

[0010] Preferably, the plurality of aluminum-based electrode plates are divided into two groups, and each group of aluminum-based electrode plates has a junction plate fixed at its end. A plurality of scraper gaps are provided between the plurality of aluminum-based electrode plates, and the stirring scraper is disposed within the scraper gaps.

[0011] Preferably, the dividing baffle is configured as a downwardly inclined funnel shape, and a connecting pipe is connected to the middle of the dividing baffle, with the lower end of the connecting pipe connected to the liquid inlet.

[0012] Preferably, the nozzle assembly includes a water inlet pipe, a flange seat, a nozzle housing, a diverter pipe, and several spray cans. The water inlet pipe is connected to a water inlet. The flange seat fixes the top end of the pipe. The nozzle housing is mounted on the flange seat. The nozzle housing has an inlet cavity connected to the water inlet. The diverter pipe is connected to a connecting hole. The spray cans are connected to the outer end of the diverter pipe.

[0013] Preferably, a rotating assembly is connected between the flange seat and the nozzle housing. The rotating assembly includes a bearing ring sleeve, a bearing core ring, and a sealing ring. The lower edge of the bearing ring sleeve is integrally formed with an inner concave ring. The inner concave ring is provided with a plurality of flange holes. The inner concave ring is bolted to the flange seat. The bearing core ring is rotatably connected inside the bearing ring sleeve. The sealing ring is installed between the inner concave ring and the bearing core ring. The bearing core ring is provided with a plurality of flange holes. The outer edge of the nozzle housing is integrally formed with a flange ring. The nozzle housing is bolted to the bearing core ring.

[0014] Preferably, the nozzle housing has several eccentrically arranged connecting holes on its side wall, the distributor pipe is fixedly connected in the connecting holes, the bottom wall of the spray can has an eccentrically arranged connecting hole, the outer end of the distributor pipe is fixed in the connecting hole, and the spray can is inclinedly arranged at the end of the distributor pipe.

[0015] Preferably, the spray can includes an integrally formed round bottom, a converging part, and a nozzle part from bottom to top. The connecting hole is eccentrically located at the round bottom. The converging part is configured as a conical cylinder with its inner diameter gradually decreasing from bottom to top. The nozzle part is configured as an inverted conical cylinder with its inner diameter gradually increasing from bottom to top.

[0016] (III) Beneficial Effects

[0017] This invention provides a device for the flocculation and recovery of silica in continuously discharged wastewater. It has the following beneficial effects:

[0018] 1. This utility model utilizes flash evaporation of wastewater to absorb a large amount of heat, thereby reducing the temperature of the wastewater. The plate heat exchanger cools the hot steam from the flash evaporation of high-temperature wastewater in the flash chamber, causing the hot steam to condense, reducing the air pressure in the flash chamber, increasing the pressure difference between the high-temperature wastewater and the flash chamber, allowing more wastewater to flash evaporate and absorb heat, further reducing the temperature of the wastewater. By controlling the flow rate of the cooling water in the plate heat exchanger, the final temperature of the wastewater in the flash tank can be controlled, so that the wastewater entering the flocculation tank is kept at a suitable temperature, avoiding the high-temperature environment that would accelerate the corrosion of electrode materials, coating peeling, and other structural damage, causing the electrode materials to fail prematurely.

[0019] 2. In this utility model, after the high-temperature wastewater passes through the inlet cavity, it is eccentrically ejected along the nozzle housing. Under the push of the inclined spray tank, the nozzle housing rotates circumferentially on the flange seat, causing the high-temperature wastewater to be sprayed in a rotating manner. The high-temperature wastewater is sprayed tangentially at high speed, and the shearing force at the nozzle causes the high-temperature wastewater to be atomized and thrown out tangentially. This increases the heat exchange area of ​​the high-temperature wastewater and the spray range, thereby improving the flash evaporation efficiency of the high-temperature wastewater, improving the cooling efficiency of the wastewater, further reducing the temperature of the wastewater, and keeping the wastewater entering the flocculation tank within a limited temperature range. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a continuous sewage silica flocculation and recovery device according to the present invention;

[0021] Figure 2 This is a schematic diagram of the nozzle assembly in this utility model;

[0022] Figure 3 This is an exploded view of the nozzle assembly in this utility model.

[0023] In the diagram: 1. Expansion tank; 2. Divider baffle; 3. Flash chamber; 4. Flocculation chamber; 5. Connecting pipe; 6. Exhaust port; 7. Inlet; 8. Inlet pipe; 9. Flange seat; 10. Nozzle housing; 11. Diverter pipe; 12. Flange ring; 13. Bearing ring sleeve; 14. Bearing core ring; 15. Sealing ring; 16. Positioning bracket; 17. Concave ring; 18. Plate heat exchanger; 19. Flocculation tank; 20. Liquid outlet; 21. Aluminum-based electrode plate; 22. Electrical contact plate; 23. Drive motor; 24. Drive shaft; 25. Stirring scraper; 26. Spray tank; 27. Settling tank. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] This utility model provides a device for the flocculation and recovery of silica from continuously discharged wastewater, such as... Figure 1-3 As shown, the device includes an expansion tank 1, with a partition baffle 2 in the middle of the expansion tank 1. The partition baffle 2 divides the interior of the expansion tank 1 into a flash chamber 3 and a flocculation chamber 4, which are arranged vertically. The partition baffle 2 is shaped like a downwardly inclined funnel, and a connecting pipe 5 is connected to the middle of the partition baffle 2. The funnel-shaped partition baffle 2 can guide the cooled high-temperature wastewater to be discharged smoothly from the connecting pipe 5 into the lower flash chamber 3, so that it will not remain in the upper flash chamber 3, thus avoiding scale formation on the partition baffle 2.

[0026] like Figure 2-3As shown, the top of the flash chamber 3 is connected to an exhaust port 6, and the middle of the side wall of the flash chamber 3 is connected to an inlet 7. The inlet 7 is used to connect to high-temperature wastewater. A nozzle assembly is connected inside the inlet 7. The nozzle assembly includes an inlet pipe 8, a flange seat 9, a nozzle housing 10, a diversion pipe 11, and several spray cans 26. The inlet pipe 8 is connected to the inlet 7. The flange seat 9 fixes the top of the pipe. The nozzle housing 10 is installed on the flange seat 9. A flange ring 12 is integrally formed on the outer edge of the nozzle housing 10. A rotating assembly is connected between the nozzle housing 10 and the flange seat 9. The rotating assembly includes a bearing ring sleeve 13, a bearing core ring 14, and a sealing ring 15. The inner wall of the flash chamber 3 is fixed. A positioning bracket 16 is fixed, and the bearing ring sleeve 13 is fixed on the positioning bracket 16. Corresponding ball grooves are provided on the inner wall of the bearing ring sleeve 13 and the outer wall of the bearing core ring 14. The bearing core ring 14 is rotatably connected inside the bearing ring sleeve 13. Rotating balls are installed in the ball grooves. An inner concave ring 17 is integrally formed on the lower edge of the bearing ring sleeve 13. Several flange holes are provided on the inner concave ring 17. The inner concave ring 17 is bolted to the flange seat 9. The sealing ring 15 is installed between the inner concave ring 17 and the bearing core ring 14. Several flange holes are provided on the bearing core ring 14. The flange ring 12 is bolted to the bearing core ring 14. The nozzle can rotate freely relative to the flange seat 9 by means of a rotating assembly.

[0027] The nozzle housing 10 has an internal cavity connected to the water inlet. Several connecting holes are eccentrically arranged on the side wall of the nozzle housing 10. The diverter pipe 11 is connected to these connecting holes and communicates with the water inlet cavity. The spray can 26, from bottom to top, includes an integrally formed round bottom, a converging portion, and a nozzle portion. A connecting hole is provided at the round bottom of the spray can 26. The outer end of the diverter pipe 11 is fixed within the connecting hole. The spray can 26 is inclined at the end of the diverter pipe 11. High-temperature, high-pressure wastewater enters the water inlet cavity after passing through the water inlet pipe 8 and is diverted and expelled through the eccentrically arranged connecting holes. After passing through the spray can 26, it is sprayed at an angle. The reaction force causes the nozzle housing 10 to rest on the bearing ring 13. The high-temperature, high-pressure wastewater enters the spray tank 26 eccentrically through a circular rotation, forming a swirling flow along the inner wall of the spray tank 26. This swirling flow can completely flush out the wastewater and impurities inside the spray tank 26, preventing scale buildup at the bottom. The converging part is designed as a conical cylinder, with its inner diameter gradually decreasing from bottom to top. The nozzle part is designed as an inverted conical cylinder, with its inner diameter gradually increasing from bottom to top. The swirling flow forms a mist-like water curtain along the outer edge of the nozzle part under the action of tangential force, increasing the heat exchange area between the high-temperature wastewater and the outside environment while extending the falling time and improving the flash evaporation efficiency of the high-temperature wastewater in the flash chamber 3, i.e., reducing the temperature of the cooled wastewater. At the same time, the rotation of the nozzle housing 10 makes the sprayed water curtain range more uniform, further increasing the heat exchange area.

[0028] like Figure 1 As shown, a plate heat exchanger 18 is installed at the top of the flash chamber 3, directly above the spray tank 26. The heat exchanger 18 has heat exchange tubes connected to the outside of the expansion tank 1, allowing cooling water to be circulated through the heat exchange tubes for preheating. This allows for waste heat recovery from the high-temperature wastewater. The flashed hot steam contacts the plate heat exchanger 18, and some of the hot steam is discharged from the exhaust port 6. The hot steam condenses with the plate heat exchanger 18, reducing the pressure inside the flash chamber 3. The pressure difference between the high-temperature wastewater and the flash chamber 3 increases the flash evaporation efficiency of the high-temperature wastewater and further reduces the temperature of the cooled wastewater. In addition, the plate heat exchanger 18 does not dilute the cooled wastewater while cooling and condensing the high-temperature steam, ensuring the concentration of silica in the wastewater and facilitating subsequent electrocoagulation operations. Furthermore, by controlling the flow rate of the cooling water in the plate heat exchanger 18, the temperature of the wastewater can be precisely controlled, keeping the cooled wastewater entering the flocculation chamber 4 within the optimal temperature range for silica electrocoagulation.

[0029] like Figure 1 As shown, a flocculation tank 19 is fixedly installed inside the flocculation chamber 4. An inlet is connected to the upper side wall of the flocculation tank 19, and the inlet is connected to the flash chamber 3 via a connecting pipe 5. An outlet 20 is connected to the lower side wall of the flocculation tank 19, and a settling tank 27 is connected to the rear end of the outlet 20 for sedimentation and separation of the silica sludge after flocculation, for recycling. Several aluminum-based electrode plates 21 are installed inside the flocculation tank 19. These aluminum-based electrode plates 21 are divided into two groups, with several scraper blades 25 spaced between them. Each group of aluminum-based electrode plates 21 has a junction plate 22 fixed to its end, which is fixed to the outer wall of the flocculation tank 19. The flocculation tank 19 is rotatably connected to the middle section. A drive shaft 24 is provided, and a drive motor 23 is fixed to the top of the flocculation tank 19. The output end of the drive motor 23 is connected to the top of the drive shaft 24. Several stirring scrapers 25 are installed on the drive shaft 24 and are arranged in the gaps between the scrapers 25. The wastewater cooled in the flash evaporation cavity enters the flocculation tank 19 through the connecting pipe 5. The silica in the wastewater forms a hydrated compound with the metal ions precipitated after the aluminum-based electrode plate 21 is energized, so as to facilitate sedimentation separation and recovery. At the same time, the scrapers 25 rotate under the drive shaft 24 to stir the wastewater in real time to reduce the influence of concentration polarization. The stirring scrapers 25 also flush the aluminum-based electrode plate 21 to prevent scale formation on the surface of the aluminum-based electrode plate 21 and passivation of the aluminum-based electrode plate 21.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous wastewater silica flocculation and recovery device, comprising an expansion tank, characterized in that: The expansion tank is equipped with a partition baffle in the middle, which divides the expansion tank into a flash chamber and a flocculation chamber arranged vertically. The flash chamber has a water inlet connected to the middle of its side wall, and a nozzle assembly is connected inside the water inlet. The top of the flash chamber has an exhaust port connected to it, and a plate heat exchanger is installed at the top of the flash chamber. The heat exchanger tubes of the plate heat exchanger are connected to the outside of the expansion tank. A flocculation tank is fixedly installed inside the flocculation chamber. The upper side wall of the flocculation tank has a liquid inlet connected to it, and the lower side wall of the flocculation tank has a liquid outlet connected to it. Several aluminum-based electrode plates are installed inside the flocculation tank. A drive shaft is rotatably connected to the middle of the flocculation tank. A drive motor is fixed to the top of the flocculation tank, and the output end of the drive motor is connected to the top of the drive shaft. Several stirring scrapers are installed on the drive shaft.

2. The continuous wastewater silica flocculation and recovery device according to claim 1, characterized in that: The aluminum-based electrode plates are divided into two groups, and each group of aluminum-based electrode plates has a grounding plate fixed at its end. A plurality of scraper gaps are provided between the aluminum-based electrode plates, and the stirring scraper is disposed in the scraper gaps.

3. The continuous discharge wastewater silica flocculation and recovery device according to claim 2, characterized in that: The dividing baffle is configured as a downwardly inclined funnel shape, and a connecting pipe is connected to the middle of the dividing baffle. The lower end of the connecting pipe is connected to the liquid inlet.

4. The continuous discharge wastewater silica flocculation and recovery device according to claim 3, characterized in that: The nozzle assembly includes a water inlet pipe, a flange seat, a nozzle housing, a diverter pipe, and several spray cans. The water inlet pipe is connected to a water inlet. The flange seat fixes the top end of the pipe. The nozzle housing is mounted on the flange seat. The nozzle housing has an internal cavity connected to the water inlet. The diverter pipe communicates with the nozzle housing. The spray cans are connected to the outer end of the diverter pipe.

5. The continuous discharge wastewater silica flocculation and recovery device according to claim 4, characterized in that: A rotating assembly is connected between the flange seat and the nozzle housing. The rotating assembly includes a bearing ring, a bearing core ring, and a sealing ring. The lower edge of the bearing ring is integrally formed with an inner concave ring. The inner concave ring is provided with several flange holes. The inner concave ring is bolted to the flange seat. The bearing core ring is rotatably connected inside the bearing ring. The sealing ring is installed between the inner concave ring and the bearing core ring. The bearing core ring is provided with several flange holes. The outer edge of the nozzle housing is integrally formed with a flange ring. The nozzle housing is bolted to the bearing core ring.

6. The continuous wastewater silica flocculation and recovery device according to claim 5, characterized in that: The nozzle housing has several eccentrically arranged connecting holes on its side wall, and the split pipe is fixedly connected in the connecting holes. The bottom wall of the spray can has an eccentrically arranged connecting hole, and the outer end of the split pipe is fixed in the connecting hole. The spray can is inclinedly arranged at the end of the split pipe.

7. The continuous discharge wastewater silica flocculation and recovery device according to claim 6, characterized in that: The spray can includes, from bottom to top, an integrally formed round bottom, a converging part, and a nozzle part. The connecting hole is eccentrically located at the round bottom. The converging part is a conical cylindrical shape with its inner diameter gradually decreasing from bottom to top. The nozzle part is an inverted conical cylindrical shape with its inner diameter gradually increasing from bottom to top.

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