High-salinity wastewater triple-effect evaporator

Abstract

The invention provides a triple-effect evaporator for high-salinity wastewater, and relates to the technical field of wastewater treatment. The high-salinity wastewater triple-effect evaporator comprises a heating module and a separation module, the separation module comprises a first-effect separator, a second-effect separator and a third-effect separator, each separator is internally provided with a filtering assembly and a wall-hanging-preventing assembly, and the filtering assembly is located on the lower portion. The anti-wall-hanging assembly comprises a connecting ring, a connecting plate, an annular water collecting disc and the like, a rubber ring is attached to the inner wall, and a V-shaped annular groove collects water drops; the motor drives the screw to rotate to drive the annular water collecting tray to move up and down, meanwhile, the end cover at the bottom of the screw drives the supporting arm to rotate, and the brush cleans crystals of the waterproof breathable film under the action of the auxiliary spring. The problem that the separation effect is affected by condensed water drops on the inner wall of the separator and filter membrane crystal attachment is solved, the treatment efficiency and stability are improved, the service life of equipment is prolonged, and the device is suitable for efficient treatment of high-salinity wastewater.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to a three-effect evaporator for high-salinity wastewater. BACKGROUND

[0002] High-salinity wastewater is widely sourced from various industries such as chemical industry, electroplating, pharmaceutical industry, and food processing. Such wastewater contains high concentrations of salt and various pollutants, and if directly discharged, it will cause serious harm to the environment. Therefore, it needs to be effectively treated. In the treatment technology of high-salinity wastewater, evaporation is one of the commonly used methods. The three-effect evaporator is widely used in the concentration and salt separation process of high-salinity wastewater due to its characteristics of heat energy cascade utilization, which can effectively reduce energy consumption and improve processing efficiency. Through the series operation of multiple evaporators, the secondary steam generated by the previous effect is used as the heat source of the next effect, realizing efficient treatment of high-salinity wastewater.

[0003] During the operation of the three-effect evaporator, when the high-salinity wastewater is heated in the heater to generate a gas-liquid mixture entering the separator, the water vapor will move upward. However, due to the temperature difference between the top and bottom of the separator, the temperature at the top is lower. When the water vapor contacts the inner wall at the top during the rising process, it will condense into water droplets due to the cold and adhere to the inner wall. With the passage of time, these adhered water droplets will gradually converge and form a water flow that flows down the inner wall. When it falls onto the water-resistant gas-permeable membrane, it will interfere with the gas-liquid separation function of the water-resistant gas-permeable membrane, resulting in a decrease in separation efficiency and affecting the overall operation efficiency and processing quality of the evaporator.

[0004] Therefore, we have developed a new three-effect evaporator for high-salinity wastewater. SUMMARY

[0005] (I) Technical problems solved In view of the shortcomings of the prior art, the present application provides a three-effect evaporator for high-salinity wastewater, which solves the problem that the inner wall of the separator condenses water vapor into water droplets due to the temperature difference between the top and bottom, and the water droplets adhere and converge and then fall onto the water-resistant gas-permeable membrane, affecting the gas-liquid separation effect.

[0006] (II) Technical solutions To achieve the above purpose, the present application is implemented by the following technical solutions: a three-effect evaporator for high-salinity wastewater, comprising a heating module and a separation module, the separation module comprising a one-effect separator, a two-effect separator, and a three-effect separator, the one-effect separator, the two-effect separator, and the three-effect separator each having a filter assembly and an anti-wall-hanging assembly installed inside, the filter assembly being located below the anti-wall-hanging assembly. The wall-hanging prevention assembly comprises a connecting ring, a plurality of connecting plates are fixedly connected in a circumferential array on the side of the connecting ring, an annular water collecting disc is fixedly connected to the top of the plurality of connecting plates, a V-shaped ring groove is formed in the top of the annular water collecting disc, a plurality of guide grooves are fixedly connected in a circumferential array in the one-effect separator, the two-effect separator and the three-effect separator, and the connecting plates are in sliding fit with the guide grooves.

[0007] Preferably, a rubber ring is fixedly installed on the outer edge of the annular water collecting disc, and the three rubber rings are respectively attached to the inner walls of the one-effect separator, the two-effect separator and the three-effect separator.

[0008] Preferably, a motor is fixedly installed on the top of the one-effect separator, the two-effect separator and the three-effect separator, a screw rod is fixedly connected to the output end of the motor, a shaft sleeve and two limiting nuts are threadedly connected to the side of the screw rod, and the shaft sleeve is located between the two limiting nuts.

[0009] Preferably, the connecting ring is fixedly connected to the bottom of the shaft sleeve, and the screw rod is in rotational fit with the connecting ring.

[0010] Preferably, a limiting plate is fixedly connected to the top of the connecting plate, a flow guide pipe is in sliding fit with one side of the limiting plate, a limiting ring is fixedly connected to the side of the flow guide pipe, and a driving spring is fixedly connected between the limiting ring and the limiting plate and sleeved on the outer side of the flow guide pipe.

[0011] Preferably, the end of the flow guide pipe away from the limiting plate penetrates through the outer wall of the annular water collecting disc and is in communication with the V-shaped ring groove.

[0012] Preferably, a piston is fixedly installed on the inner wall of the V-shaped ring groove, and the piston is in sliding fit with the flow guide pipe.

[0013] Preferably, the wall-hanging prevention assembly comprises an annular frame in rotational fit with the screw rod, and a water-resisting and air-permitting film is fixedly connected to the annular frame.

[0014] Preferably, an end cover is fixedly connected to the bottom of the screw rod, a plurality of supporting arms are fixedly connected in a circumferential array to the side of the end cover, a sliding groove is formed in the top of the supporting arm, a brush is in sliding fit in the sliding groove, and two auxiliary springs are installed in the brush and located in the sliding groove.

[0015] Preferably, two flow-through openings are fixedly installed on the outer side of the one-effect separator, the two-effect separator and the three-effect separator, the two flow-through openings are located above and below the filter assembly respectively, a liquid conveying pipe is circumscribed between the two flow-through openings, and a switch valve is fixedly installed on the liquid conveying pipe.

[0016] (Three)beneficial effects The application provides a three-effect evaporator for high-salinity wastewater, and has the following beneficial effects: 1. The high-salinity wastewater three-effect evaporator, by setting the anti-wall hanging assembly in each separator, using the motor to drive the screw to rotate, driving the rubber ring on the annular water collecting disc to move along the inner wall, can effectively scrape off the attached condensate water droplets and collect them into the V-shaped ring groove, then through the flow guide pipe and the flow-through port to guide the liquid out of the backflow, avoid the water droplets flowing to the water-separation air-permeable membrane to affect the separation effect, significantly improve the stability and efficiency of gas-liquid separation.

[0017] 2. The high-salinity wastewater three-effect evaporator, by rotating the screw to drive the end cover and the arm, the brush is always in contact with the surface of the water-separation air-permeable membrane under the action of the auxiliary spring, which can not only clean the attached solid crystals in time, but also avoid the brush from wearing the filter membrane through the contraction of the auxiliary spring, thus protecting the filtration performance of the water-separation air-permeable membrane and prolonging its service life. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a structural schematic diagram of the separator; Figure 3 is a structural schematic diagram of the anti-wall hanging assembly; Figure 4 is Figure 3 is an enlarged schematic diagram of position A in the middle; Figure 5 is a sectional view of the liquid discharge mechanism; Figure 6 is a structural schematic diagram of the filter assembly; Figure 7 is a sectional view of the filter assembly.

[0019] 1, one-effect separator; 2, two-effect separator; 3, three-effect separator; 4, filter assembly; 5, anti-wall hanging assembly; 6, connecting ring; 7, connecting plate; 8, annular water collecting disc; 9, V-shaped ring groove; 10, guide groove; 11, rubber ring; 12, motor; 13, screw; 14, shaft sleeve; 15, limiting plate; 16, flow guide pipe; 17, limiting ring; 18, drive spring; 19, piston; 20, annular frame; 21, water-separation air-permeable membrane; 22, end cover; 23, arm; 24, sliding groove; 25, brush; 26, auxiliary spring; 27, flow-through port; 28, heating module. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0021] Examples, such as Figure 1 - Figure 7 As shown, this embodiment of the invention provides a triple-effect evaporator for high-salinity wastewater, including a heating module 28 and a separation module. The separation module includes a first-effect separator 1, a second-effect separator 2, and a third-effect separator 3. Each of the first-effect separator 1, second-effect separator 2, and third-effect separator 3 is internally equipped with a filter assembly 4 and an anti-wall-attachment assembly 5, with the filter assembly 4 located below the anti-wall-attachment assembly 5. The heating module 28 includes a first-effect heater, a second-effect heater, and a third-effect heater, which respectively correspond to the first-effect separator 1, second-effect separator 2, and third-effect separator 3. The first-effect heater heats the high-salinity wastewater through an external heat source, and the resulting gas-liquid mixture enters the first-effect separator 1. The secondary steam separated by the first-effect separator 1 enters the second-effect heater as a heat source, heating subsequent wastewater and generating a gas-liquid mixture that enters the second-effect separator 2. The secondary steam separated by the second-effect separator 2 then enters the third-effect heater, further heating the wastewater and generating a gas-liquid mixture that enters the third-effect separator 3. Through the step-by-step coordination of the heaters of the heating module 28 and the corresponding separators of the separation module, the thermal energy is utilized in stages to complete the evaporation and gas-liquid separation process of high-salt wastewater.

[0022] Specifically, the anti-wall-hanging component 5 includes a connecting ring 6. Several connecting plates 7 are fixedly connected in a circular array on the side of the connecting ring 6. An annular water collection tray 8 is fixedly connected to the top of the connecting plates 7. A V-shaped groove 9 is opened on the top of the annular water collection tray 8. Several guide channels 10 are fixedly connected in a circular array inside the first-effect separator 1, the second-effect separator 2, and the third-effect separator 3. The connecting plates 7 slide with the guide channels 10. The connecting ring 6 provides a fixed base for the connecting plates 7. The connecting plates 7 connect the connecting ring 6 to the annular water collection tray 8, so that the annular water collection tray 8 can move synchronously with the connecting ring 6. The V-shaped groove 9 can effectively collect the scraped water droplets. Its V-shaped structure facilitates liquid convergence. The guide channel 10 guides the vertical movement of the connecting plates 7, ensuring that the annular water collection tray 8 remains stable during movement, while limiting the rotation of the connecting plates 7. Rubber rings 11 are fixedly installed on the outer edge of the annular water collection tray 8. The three rubber rings 11 are respectively attached to the inner walls of the first-effect separator 1, the second-effect separator 2 and the third-effect separator 3. The rubber rings 11 are soft and elastic, and can make close contact with the inner wall of the separator. They can effectively scrape off the water droplets attached to the inner wall, while avoiding hard materials from scratching and damaging the inner wall of the separator, thus ensuring the integrity of the inner wall.

[0023] Motors 12 are fixedly mounted on the top of the single-effect separator 1, the double-effect separator 2, and the triple-effect separator 3. A screw 13 is fixedly connected to the output end of the motor 12. A bushing 14 and two limit nuts (limit nuts are existing technology and are not shown in the figure, so they will not be described in detail here) are threadedly connected to the circumference of the screw 13. The bushing 14 is located between the two limit nuts. A connecting ring 6 is fixedly connected to the bottom of the bushing 14. The screw 13 and the connecting ring 6 are in a through-rotational engagement. The motor 12 provides power to the entire motion mechanism, and its output end drives the screw 13 to rotate. The screw 13 and the bushing 14 are threadedly engaged, converting the rotational motion of the screw 13 into the linear motion of the bushing 14. The two limit nuts can limit the range of movement of the bushing 14 on the screw 13 to prevent the bushing 14 from moving excessively. The connecting ring 6 is fixed to the bottom of the bushing 14 so that the movement of the bushing 14 can drive the connecting ring 6 and the connected components to move synchronously. The through-rotational engagement between the screw 13 and the connecting ring 6 ensures that the rotation of the screw 13 does not affect the movement of the connecting ring 6.

[0024] A limiting plate 15 is fixedly connected to the top of a connecting plate 7. A guide tube 16 is slidably fitted through one side of the limiting plate 15. A limiting ring 17 is fixedly connected to the periphery of the guide tube 16. A drive spring 18, sleeved on the outer periphery of the guide tube 16, is fixedly connected between the limiting ring 17 and the limiting plate 15. The limiting plate 15 provides a mounting and limiting base for the guide tube 16, allowing the guide tube 16 to slide along its penetrating direction. The limiting ring 17 restricts the position of the drive spring 18, preventing it from falling off the guide tube 16. The drive spring 18 can push the guide tube 16 to move in its natural state. When it is squeezed, it is in a stored state. After the external force disappears, it can drive the guide tube 16 to reset, realizing the automatic movement function of the guide tube 16.

[0025] The end of the guide pipe 16 away from the limiting plate 15 passes through the outer wall of the annular water collection plate 8 and is connected to the V-shaped annular groove 9, so that the liquid collected in the V-shaped annular groove 9 can be discharged through the guide pipe 16, providing a channel for liquid flow and ensuring that the liquid in the V-shaped annular groove 9 can be smoothly discharged, avoiding excessive accumulation that would affect the subsequent water collection effect.

[0026] A piston 19 is fixedly installed on the inner wall of the V-shaped annular groove 9. The piston 19 is slidably engaged with the guide tube 16. When the guide tube 16 moves, the piston 19 can control the communication state between the V-shaped annular groove 9 and the guide tube 16. When the guide tube 16 has not moved to the designated position, the piston 19 can close the inlet of the guide tube 16 to prevent the liquid from flowing out prematurely. When the guide tube 16 moves to the corresponding position, the piston 19 disengages from the guide tube 16, allowing the liquid to flow smoothly into the guide tube 16.

[0027] Specifically, the wall-hanging prevention assembly 5 comprises an annular frame 20 in penetrating rotary connection with the screw rod 13, and a water vapor permeable membrane 21 is fixedly connected to the annular frame 20, the annular frame 20 provides fixed support for the water vapor permeable membrane 21, so that the water vapor permeable membrane 21 can be stably installed inside the separator; the water vapor permeable membrane 21 can allow water vapor to pass through and filter impurities, realizing the core function of gas-liquid separation, and the design of penetrating rotary connection between the screw rod 13 and the annular frame 20 ensures that the stability of the annular frame 20 and the water vapor permeable membrane 21 is not affected when the screw rod 13 rotates.

[0028] The end cover 22 is fixedly connected to the bottom of the screw rod 13, a plurality of arms 23 are fixedly connected to the circumferential side of the end cover 22 in a circumferential array, a sliding groove 24 is formed in the top of each arm 23, a brush 25 is slidingly connected to the inside of the sliding groove 24, and two auxiliary springs 26 are installed at the bottom of the brush 25 and located inside the sliding groove 24, wherein the end cover 22 transmits the rotation of the screw rod 13 to the arms 23, so that the arms 23 rotate synchronously with the screw rod 13; the arms 23 provide an installation base for the brush 25, and the sliding groove 24 allows the brush 25 to slide up and down inside it; the auxiliary springs 26 are elastic and can support the brush 25 so that it is always in contact with the surface of the water vapor permeable membrane 21, and can be retracted when the distance between the brush 25 and the filter membrane is too close to avoid abrasion of the filter membrane, ensuring cleaning effect while protecting the filter membrane; The outer circumferential side of the one-stage separator 1, the two-stage separator 2 and the three-stage separator 3 is fixedly installed with two flow-through openings 27, the two flow-through openings 27 are located above and below the filter assembly 4 respectively, an infusion tube is connected between the two flow-through openings 27, and a switch valve is fixedly installed on the infusion tube (both the infusion tube and the switch valve are prior art, not shown in the figure, and will not be described in detail here); the flow-through opening 27 located above the filter assembly 4 can be used to discharge the liquid led out by the flow guide pipe 16, the liquid reenters the separator after passing through the infusion tube, the switch valve and the flow-through opening 27 below in sequence, and the switch valve can control the opening and closing of the infusion tube, facilitating the adjustment of the flow state of the liquid as needed.

[0029] Working principle: the one-stage heater, the two-stage heater and the three-stage heater included in the heating module 28 are correspondingly matched with the one-stage separator 1, the two-stage separator 2 and the three-stage separator 3 of the separation module respectively, the one-stage heater heats the high-salinity wastewater by an external heat source, the generated gas-liquid mixture enters the one-stage separator 1, the secondary steam separated out by the one-stage separator 1 enters the two-stage heater as a heat source, heats the subsequent wastewater and generates a gas-liquid mixture which enters the two-stage separator 2, the secondary steam separated out by the two-stage separator 2 enters the three-stage heater again, continues to heat the wastewater to generate a gas-liquid mixture which enters the three-stage separator 3, and through such step-by-step matching, the heat energy is utilized in stages to evaporate and separate the gas and liquid of the high-salinity wastewater; The gas-liquid mixture entering each separator first undergoes preliminary separation through the filter assembly 4. The anti-wall-attachment assembly 5 can be set to operate at a frequency according to actual needs. Specifically, it allows water vapor to pass through and filters impurities through the water-proof and breathable membrane 21. Solid crystals in the gas-liquid mixture easily adhere to the surface of the water-proof and breathable membrane 21. At this time, the motors 12 installed on the top of the first-effect separator 1, the second-effect separator 2, and the third-effect separator 3 start. The output end of the motor 12 drives the screw 13 to rotate. The end cover 22 at the bottom of the screw 13 rotates with it, and the support arms 23 around the end cover 22 rotate synchronously. The brush 25 inside the upper slide groove 24, supported by the auxiliary spring 26, remains in contact with the surface of the water-proof and breathable membrane 21. As the support arm 23 rotates, it cleans the attached crystals. The auxiliary spring 26 can contract when the brush 25 is too close to the water-proof and breathable membrane 21 to avoid abrasion of the filter membrane. At the same time, because the temperature at the bottom of the separator inner wall is higher than that at the top, steam will condense into water droplets when it comes into contact with the upper inner wall and adhere to the inner wall. If these water droplets flow down onto the water-proof and breathable membrane 21, they will affect the gas-liquid separation effect. At this time, the motor 12 drives the screw 13 to rotate, and the shaft threadedly connected to the screw 13... Sleeve 14 moves linearly within the range limited by the two limiting nuts. The connecting ring 6 at the bottom of sleeve 14 moves accordingly. The connecting plate 7 on the periphery of the connecting ring 6 slides along the guide channel 10 inside the separator, causing the annular water collecting plate 8 on the top of the connecting plate 7 to move synchronously. The rubber ring 11 on the outer edge of the annular water collecting plate 8 fits against the inner wall of the separator, scraping away water droplets on the inner wall during the movement. The water droplets flow into the V-shaped annular groove 9 on the top of the annular water collecting plate 8 for temporary storage. When the annular water collecting plate 8 moves to the highest position, the guide pipe 16 on one side of the limiting plate 15 fixed on the top of the connecting plate 7 also moves synchronously. When the liquid reaches the upper flow port 27, the inner wall of the separator previously squeezed the guide tube 16 to make it contract. At this time, the squeezing disappears, and the drive spring 18 between the limit ring 17 and the limit plate 15 returns to the stored state, driving the guide tube 16 to move towards the flow port 27. This causes the piston 19 installed on the inner wall of the V-shaped ring groove 9 to disengage from the guide tube 16. The liquid in the V-shaped ring groove 9 flows into the upper flow port 27 through the guide tube 16, and then re-enters the separator through the external infusion pipe and the switch valve from the flow port 27 located below the filter assembly 4, completing the entire processing process.

[0030] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-salinity wastewater triple-effect evaporator comprising a heating module (28) and a separation module comprising a first-effect separator (1), a second-effect separator (2) and a third-effect separator (3), characterized in that: The one-effect separator (1), two-effect separator (2) and three-effect separator (3) are internally provided with a filtering assembly (4) and a wall-hanging prevention assembly (5), and the filtering assembly (4) is located below the wall-hanging prevention assembly (5). The wall-hanging prevention assembly (5) comprises a connecting ring (6), a plurality of connecting plates (7) are fixedly connected in a circumferential array on the side of the connecting ring (6), a ring-shaped water collecting disc (8) is fixedly connected to the top of the connecting plates (7), a V-shaped ring groove (9) is formed in the top of the ring-shaped water collecting disc (8), a plurality of guide grooves (10) are fixedly connected in a circumferential array inside the one-effect separator (1), two-effect separator (2) and three-effect separator (3), and the connecting plates (7) are in sliding fit with the guide grooves (10).

2. A high salinity wastewater triple-effect evaporator as claimed in claim 1, characterized in that: A rubber ring (11) is fixedly installed on the outer edge of the ring-shaped water collecting disc (8), and the three rubber rings (11) are respectively attached to the inner walls of the one-effect separator (1), two-effect separator (2) and three-effect separator (3).

3. A high salinity wastewater triple-effect evaporator according to claim 2, characterized in that: A motor (12) is fixedly installed on the top of the one-effect separator (1), two-effect separator (2) and three-effect separator (3), a screw rod (13) is fixedly connected to the output end of the motor (12), an axle sleeve (14) and two limiting nuts are threadedly connected to the side of the screw rod (13), and the axle sleeve (14) is located between the two limiting nuts.

4. A high salinity wastewater triple-effect evaporator as claimed in claim 3, characterized in that: The connecting ring (6) is fixedly connected to the bottom of the axle sleeve (14), and the screw rod (13) is in rotational fit with the connecting ring (6).

5. A high salinity wastewater triple-effect evaporator according to claim 4, characterized in that: A limiting plate (15) is fixedly connected to the top of the connecting plate (7), a guide pipe (16) is in sliding fit with one side of the limiting plate (15), a limiting ring (17) is fixedly connected to the side of the guide pipe (16), and a driving spring (18) is fixedly connected between the limiting ring (17) and the limiting plate (15) and sleeved on the outer side of the guide pipe (16).

6. A high salinity wastewater triple-effect evaporator according to claim 5, characterized in that: One end of the guide pipe (16) away from the limiting plate (15) penetrates through the outer wall of the ring-shaped water collecting disc (8) and is in communication with the V-shaped ring groove (9).

7. A high salinity wastewater triple-effect evaporator according to claim 6, characterized in that: A piston (19) is fixedly installed on the inner wall of the V-shaped ring groove (9), and the piston (19) is in sliding fit with the guide pipe (16).

8. A high salinity wastewater triple-effect evaporator according to claim 7, characterized in that: The wall-hanging prevention assembly (5) comprises a ring-shaped frame (20) in rotational fit with the screw rod (13), and a water-proof and air-permeable film (21) is fixedly connected to the ring-shaped frame (20).

9. A high salinity wastewater triple-effect evaporator according to claim 8, characterized in that: An end cover (22) is fixedly connected to the bottom of the screw rod (13), a plurality of supporting arms (23) are fixedly connected in a circumferential array to the side of the end cover (22), a sliding groove (24) is formed in the top of the supporting arm (23), a brush (25) is in sliding fit inside the sliding groove (24), and two auxiliary springs (26) are installed at the bottom of the brush (25) and located inside the sliding groove (24).

10. A high salinity wastewater triple-effect evaporator as claimed in claim 9, characterized in that: Two flow-through openings (27) are fixedly installed on the outer side of the one-effect separator (1), two-effect separator (2) and three-effect separator (3), the two flow-through openings (27) are respectively located above and below the filtering assembly (4), a liquid conveying pipe is externally connected between the two flow-through openings (27), and a switch valve is fixedly installed on the liquid conveying pipe.

Images