Low-temperature multi-effect evaporation, concentration and crystallization device for treating wastewater with high salt content and phenol content

Abstract

The invention discloses a low-temperature multi-effect evaporation, concentration and crystallization device for treating high-salt-content and high-phenol-content wastewater, and relates to the technical field of evaporation and crystallization, the low-temperature multi-effect evaporation, concentration and crystallization device comprises a first evaporator assembly comprising a second outer shell and an inner shell, an inner cavity of the second outer shell is fixedly connected with the outer surface of the inner shell, and a partition plate is fixedly connected to the lower portion of the inner cavity of the second outer shell; the middle of the inner shell is rotationally connected with a threaded rod, the upper portion and the lower portion of the threaded rod are symmetrically and rotationally connected with first cleaning assemblies, the middle of the threaded rod is in threaded connection with a third scraper, and a rotating assembly is arranged at the upper end of the inner shell. A third scraping plate is in threaded connection with the middle of the threaded rod, so that when the threaded rod rotates, the third scraping plate can be driven to ascend and descend in the inner cavity of the inner shell, then crystals in the middle of the inner cavity of the inner shell can be cleaned, and accumulation of crystal substances in the inner cavity of the inner shell can be reduced; the influence of crystallization on the heat exchange efficiency between steam and feed liquid and the influence on the evaporation rate can be reduced or even avoided, and excessive accumulation of crystals can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of evaporation and crystallization, and in particular to a low-temperature multiple-effect evaporation, concentration and crystallization device for treating high-salt and phenol-containing wastewater. Background Art

[0002] Low-temperature multi-effect evaporation concentration and crystallization technology is an efficient and energy-saving wastewater treatment technology. It is widely used in the fields of desalination of high-salt wastewater, concentration of dilute solutions and seawater desalination. This technology connects multiple evaporators in series and uses low-temperature (about 90°C) heating steam to evaporate the liquid step by step to achieve concentration and crystallization of the liquid. In the system, the first-effect evaporator first receives heating steam to heat the liquid to generate steam, which then serves as a heat source and enters the subsequent evaporators in turn to achieve step-by-step evaporation. Through this process, one steam input can evaporate multiple times the amount of water. At the same time, the liquid reaches an oversaturated state in the last effect, crystallizes, and achieves solid-liquid separation.

[0003] Although low-temperature multi-effect evaporation, concentration and crystallization technology has demonstrated excellent performance in the field of wastewater treatment, conventional first-effect evaporators face significant challenges in long-term operation: their inner walls are directly exposed to high-temperature steam, where the feed temperature is the highest and the evaporation rate is the fastest, making it easy to reach an oversaturated state and precipitate crystals. Unfortunately, current designs generally lack an effective inner wall cleaning mechanism, which leads to the gradual accumulation of crystals. This not only reduces the heat exchange efficiency between steam and feed and slows down the evaporation rate, but also forces the system to increase steam supply to maintain the evaporation effect, thereby increasing energy consumption. More seriously, excessive accumulation of crystals may block the inside of the evaporator, seriously threatening the stable operation of the system and even forcing the system to shut down for maintenance and cleaning.

[0004] Chinese patent document CN211920933U discloses a salt-containing wastewater concentration and crystallization device, including a heating chamber, an evaporation chamber and a separation chamber, wherein the heating chamber is connected to the middle of the evaporation chamber through a connecting pipe, the evaporation chamber is connected to the separation chamber through a conveying pipe, the bottom of the separation chamber is connected to a circulation pump through a recovery pipe, the other end of the circulation pump is connected to the heat exchange pipe and the evaporation chamber, the evaporation chamber is connected to the circulation pump through a receiving pipe, the receiving pipe and the evaporation chamber are directly connected through a thread, a feed port is provided on the side of the heating chamber, the feed port presents a trumpet-shaped opening upward and downward, a heat preservation layer is wrapped outside the heating chamber, and a circulating cooling pipe is wound outside the separation chamber; however, there are still the following defects in the implementation process:

[0005] Although the device in the above-mentioned document can effectively maintain the original temperature of the heating chamber and the separation chamber by adding an insulation layer and a circulating cooling pipe, thereby improving the crystallization rate of the salt-containing wastewater, the device in the above-mentioned document cannot process the crystallization on the inner wall of the evaporator, resulting in the gradual accumulation of crystals, which not only reduces the heat exchange efficiency between steam and liquid, slows down the evaporation rate, but also forces the system to increase the steam supply to maintain the evaporation effect. Summary of the invention

[0006] The object of the present invention is to provide a low-temperature multiple-effect evaporation concentration crystallization device for treating high-salt and phenol-containing wastewater, so as to solve the problem that the device proposed in the above background technology cannot treat the crystals on the inner wall of the evaporator.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A low-temperature multi-effect evaporation concentration crystallization device for treating high-salt and phenol-containing wastewater, comprising a support frame 1 and a support frame 2; the upper end of the support frame 1 is fixedly connected to the lower end of the support frame 2, the middle part of the support frame 1 is fixedly connected to two second evaporator assemblies, and one side of the support frame 1 is fixedly connected to a first evaporator assembly;

[0009] The first evaporator component includes an outer shell 2 and an inner shell. The inner cavity of the outer shell 2 is fixedly connected to the outer surface of the inner shell. A partition is fixedly connected to the lower part of the inner cavity of the outer shell 2. A threaded rod is rotatably connected to the middle part of the inner shell. The upper part of the threaded rod and the lower part of the threaded rod are symmetrically rotatably connected to the first cleaning component. The middle part of the threaded rod is threadedly connected to a scraper 3. A rotating component is arranged on the upper end of the inner shell, and the rotating component is used to drive the threaded rod to rotate.

[0010] The above-mentioned technical scheme is adopted, in which steam is transported to the gap between the inner cavity of the outer shell and the outer surface of the inner shell through a steam pipe, and then the temperature of the inner shell can be increased by using the steam, so that the material liquid in the inner cavity of the inner shell can be evaporated, crystals can be precipitated, and solid-liquid separation can be achieved, and then some crystals will adhere to the inner wall of the inner shell, and the first cleaning components are symmetrically fixedly connected to the upper part and the lower part of the threaded rod, so that when the rotating component drives the threaded rod to rotate, the two first cleaning components can be driven to rotate, and then the two first cleaning components can be used to clean the crystals on the upper part and the lower part of the inner shell respectively, and the scraper three is threadedly connected to the middle part of the threaded rod, so that when the threaded rod rotates, the scraper three can be driven to rise and fall in the inner cavity of the inner shell, and then the crystals in the middle part of the inner cavity of the inner shell can be cleaned.

[0011] A further improvement of the technical solution of the present invention is that the first cleaning component includes an annular block and a plurality of scraper 1s, the plurality of scraper 1s are fixedly connected to the threaded rod, the annular block is fixedly and slidably connected to the threaded rod, a plurality of scraper 2s are fixedly connected to the annular array on the outer surface of the annular block, and a plurality of connecting pipe assemblies are fixedly connected to the opposite surfaces of scraper 1 and scraper 2 on the same side.

[0012] The above technical solution is adopted, in which scraper 1 can clean the bottom wall and side wall of the inner shell, so that the crystals attached to the inner cavity of the inner shell can be processed. The annular block is slidably connected to the threaded rod, and scraper 1 and scraper 2 are fixedly connected together with a plurality of connecting pipe assemblies, so that the position of scraper 2 can be limited by the connecting pipe assemblies.

[0013] A further improvement of the technical solution of the present invention is that the connecting pipe assembly includes a hollow tube one, the outer surface of the hollow tube one is fixedly connected to the scraper one, the inner cavity of the hollow tube one is slidably connected to the hollow tube two, the side of the hollow tube two away from the hollow tube one is fixedly connected to the scraper two, and the inner cavities of the hollow tube one and the hollow tube two are fixedly connected with a spring.

[0014] By adopting the above technical solution, in which hollow tube one and hollow tube two are connected together by a spring, the elasticity of the spring can be used to absorb part of the energy of the force applied by scraper three to hollow tube two, thereby playing a role of buffering and shock absorption, thereby helping to protect the connecting pipe assembly from damage.

[0015] A further improvement of the technical solution of the present invention is that a limiting groove is provided on one side of the inner wall of the inner shell, a slider is fixedly connected to one side of the scraper blade 3 close to the limiting groove, and the outer surface of the slider is slidably connected to the inner cavity of the limiting groove.

[0016] The above technical solution is adopted, in which a limiting groove is opened in the inner cavity of the inner shell, and then the slider is slidably connected with the inner cavity of the limiting groove, so that the position of the scraper three can be limited by the slider to prevent the scraper three from rotating when the threaded rod rotates, thereby causing the scraper three to be unable to be raised or lowered.

[0017] A further improvement of the technical solution of the present invention is that the rotating assembly includes a worm wheel and a worm, the worm is meshingly connected with an adjacent worm, the lower part of the worm is rotatably connected to a connecting platform, the lower end of the connecting platform is fixedly connected to the upper end of the inner shell, and the inner cavity of the worm wheel is fixedly connected to the threaded rod.

[0018] The above technical solution is adopted, in which the worm is meshed with the adjacent worm wheel, so that when the worm rotates, the adjacent worm wheel can be meshed, and then the worm wheel rotates, and then the threaded rod is driven to rotate by the worm wheel.

[0019] A further improvement of the technical solution of the present invention is that a plurality of steam inlet holes are provided in the annular array of partitions.

[0020] By adopting the above technical solution, a number of steam inlet holes are opened in a circular array on the partition, and the steam transported to the inner cavity of the outer shell two can be guided by the number of steam inlet holes, and transported to the upper part of the outer shell two through the number of steam inlet holes, which can avoid local excessive or weak air intake, thereby improving the air intake efficiency, and can make the upper part of the inner shell heated more evenly, avoiding problems such as excessive local heat and insufficient local heat.

[0021] A further improvement of the technical solution of the present invention is that the second evaporator assembly includes two funnels, the opposite surfaces of the two funnels are fixedly connected to a shell 1, the inner cavity of the shell 1 is fixedly connected to a plurality of evaporation film tubes, and the inner cavities of the plurality of evaporation film tubes are communicated with the inner cavities of the two funnels.

[0022] The above technical scheme is adopted, in which the inner cavities of several evaporating membrane tubes are connected with the inner cavities of two funnels, so that the feed liquid can be transported to the inner cavity of the funnel located on the lower side by a water pump, and then the feed liquid is transported to the inner cavities of several evaporating membrane tubes through the inner cavity of the funnel located on the lower side, and then the steam is transported to the inner cavity of the evaporating membrane tubes through the evaporating membrane tubes and the steam transport pipeline, and then the several evaporating membrane tubes are heated by steam, so as to improve the stability of the feed liquid, and then the feed liquid is evaporated, concentrated and crystallized, and then the feed liquid and crystals are transported to the inner cavity of the funnel located on the upper side through the several evaporating membrane tubes, and then the water pipe is used to transport the liquid to the inner cavity of the next process for processing in the next process.

[0023] A further improvement of the technical solution of the present invention is that the sides of the scraper 2 and the scraper 1 close to the inner wall of the inner shell are both tapered.

[0024] The above-mentioned technical solution is adopted, in which the side of scraper 2 and scraper 1 close to the inner wall of the inner shell is set to be conical, thereby reducing the force required to be applied during the cleaning process and accelerating the loosening and shedding speed of the crystals, thereby significantly improving the cleaning efficiency. The conical tip can penetrate deep into the tiny gaps and corners of the crystal layer to ensure that these hard-to-reach areas can also be thoroughly cleaned, which helps to reduce crystal residue, keep the inner wall of the steamer clean and smooth, and thus improve the overall performance and efficiency of the steamer.

[0025] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0026] 1. The present invention provides a low-temperature multi-effect evaporation, concentration and crystallization device for treating high-salt and phenol-containing wastewater. Steam is transported to the gap between the second inner cavity of the outer shell and the outer surface of the inner shell through a steam pipeline, and then the temperature of the inner shell can be increased by using the steam, so that the feed liquid in the inner cavity of the inner shell can be evaporated, crystals are precipitated, and solid-liquid separation is achieved. Then some crystals will adhere to the inner wall of the inner shell. The first cleaning components are symmetrically fixedly connected to the upper part of the threaded rod and the lower part of the threaded rod, so that when the rotating component drives the threaded rod to rotate, the two first cleaning components can be driven to rotate, and then Two first cleaning components are used to clean the crystals on the upper part and the lower part of the inner shell respectively. A scraper three is threadedly connected to the middle part of the threaded rod, so that when the threaded rod rotates, the scraper three can be driven to rise and fall in the inner cavity of the inner shell, and then the crystals in the middle part of the inner cavity of the inner shell can be cleaned, thereby reducing the accumulation of crystals in the inner cavity of the inner shell, reducing or even avoiding the influence of crystals on the heat exchange efficiency between steam and liquid feed, affecting the evaporation rate, avoiding excessive accumulation of crystals, and then blocking the inside of the evaporator, seriously threatening the stable operation of the system, thereby improving the production stability of the device.

[0027] 2. The present invention provides a low-temperature multi-effect evaporation, concentration and crystallization device for treating high-salt and phenol-containing wastewater. A limiting groove is provided in the inner cavity of the inner shell, and then a slider is slidably connected with the inner cavity of the limiting groove, so that the position of the scraper three can be limited by the slider to prevent the rotation of the threaded rod and the rotation of the scraper three, thereby causing the scraper three to be unable to be raised or lowered, thereby affecting the crystallization cleaning of the middle part of the inner wall of the inner shell by the scraper three.

[0028] 3. The present invention provides a low-temperature multi-effect evaporation, concentration and crystallization device for treating high-salt and phenol-containing wastewater. By opening a plurality of steam inlet holes in a circular array on the partition plate, the steam transported to the inner cavity of the second outer shell can be guided by the plurality of steam inlet holes and transported to the upper part of the second outer shell through the plurality of steam inlet holes, thereby avoiding excessive or weak local air intake, thereby improving air intake efficiency, and allowing the upper part of the inner shell to be heated more evenly, avoiding problems such as excessive local heat and insufficient local heat, thereby improving the heating uniformity of the inner shell and improving crystallization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0031] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0032] Figure 3 The overall structure of the present invention is shown in FIG. Figure 3 ;

[0033] Figure 4 The first evaporator component of the present invention is schematically shown in cross section. Figure 1 ;

[0034] Figure 5 The first evaporator component of the present invention is schematically shown in cross section. Figure 2 ;

[0035] Figure 6 The first cleaning component of the present invention is shown in FIG. Figure 1 ;

[0036] Figure 7 The first cleaning component of the present invention is shown in FIG. Figure 2 ;

[0037] Figure 8 For the present invention Figure 7 A magnified schematic diagram of point A;

[0038] Fig. 9 The third schematic diagram of the scraper of the present invention;

[0039] Fig.10 It is a schematic diagram of a rotating assembly of the present invention;

[0040] Fig.11 It is a schematic diagram of a partition of the present invention;

[0041] Fig.12 It is a schematic diagram of the second evaporator component of the present invention.

[0042] In the figure: 1. support frame 1; 2. second evaporator assembly; 21. funnel; 22. outer shell 1; 23. evaporating membrane tube; 3. first evaporator assembly; 31. outer shell 2; 32. inner shell; 321. limiting groove; 33. partition; 331. steam inlet hole; 34. threaded rod; 35. first cleaning assembly; 351. scraper 1; 352. connecting pipe assembly; 3521. hollow tube 1; 3522. hollow tube 2; 3523. spring; 353. scraper 2; 354. annular block; 36. scraper 3; 37. slider; 38. rotating assembly; 381. worm gear; 382. worm; 383. connecting table; 4. support frame 2. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with embodiments:

[0044] Example 1

[0045] like Figure 1 - Figure 5As shown, the present invention provides a low-temperature multi-effect evaporation concentration crystallization device for treating high-salt and phenol-containing wastewater, including a support frame 1 and a support frame 2 4; the upper end of the support frame 1 is fixedly connected to the lower end of the support frame 2 4, two second evaporator assemblies 2 are fixedly connected to the middle of the support frame 1, and a first evaporator assembly 3 is fixedly connected to one side of the support frame 1;

[0046] The first evaporator component 3 includes an outer shell 2 31 and an inner shell 32. The inner cavity of the outer shell 2 31 is fixedly connected to the outer surface of the inner shell 32. A partition 33 is fixedly connected to the lower part of the inner cavity of the outer shell 2 31. A threaded rod 34 is rotatably connected to the middle part of the inner shell 32. The upper part of the threaded rod 34 and the lower part of the threaded rod 34 are symmetrically rotatably connected to the first cleaning component 35. The middle part of the threaded rod 34 is threadedly connected to a scraper 36. A rotating component 38 is arranged on the upper end of the inner shell 32. The rotating component 38 is used to drive the threaded rod 34 to rotate.

[0047] In this embodiment, the feed liquid can be evaporated twice by two second evaporator components 2, and then the feed liquid is transported to the inner cavity of the first evaporator component 3 for final evaporation. In this process, the feed liquid is concentrated step by step, the water content is continuously reduced, and the solute concentration is gradually increased. The feed liquid can be further evaporated and heated by the first evaporator component 3, and then the feed liquid will continue to be heated to a boiling state and evaporated and separated. At this time, since the solution has been concentrated twice, its concentration is relatively high, and it is easier to meet the conditions for crystallization. Therefore, in the inner cavity of the inner shell 32, with the further evaporation of water, the solute may gradually precipitate to form crystals, and then some crystals will adhere to the inner wall of the inner shell 32, and operate through the rotating component 38, and the rotating component 38 is used to drive the threaded rod 34 to rotate, and then the two first cleaning components 35 can be driven to clean the crystals of the upper part and the lower part of the inner cavity of the inner shell 32. The rotation of the threaded rod 34 can drive the scraper three 36 to move up and down in the inner cavity of the inner shell 32, and then the scraper three 36 can be used to clean the crystals in the middle part of the inner cavity of the inner shell 32.

[0048] Example 2

[0049] like Fig.12 As shown, based on Example 1, the present invention provides a technical solution: preferably, the second evaporator assembly 2 includes two funnels 21, and the opposite surfaces of the two funnels 21 are fixedly connected to a shell 22, and the inner cavity of the shell 22 is fixedly connected to a plurality of evaporation film tubes 23, and the inner cavities of the plurality of evaporation film tubes 23 are communicated with the inner cavities of the two funnels 21.

[0050] In this embodiment, when it is necessary to perform low-temperature multi-effect evaporation, concentration and crystallization on wastewater, the wastewater can be transported to the filter through the cooperation of the pipeline and the water pump, and filtered through the filter to remove large suspended particles, impurities and some insoluble substances in the wastewater, so as to reduce scaling and blockage that may occur in the subsequent evaporation process. Then, the pretreated wastewater will be transported to the inner cavity of the second evaporator component 2 close to the filter side through the cooperation of the pipeline and the water pump, and then the wastewater will be transported from the inner cavity of the funnel 21 to the inner cavities of several evaporation membrane tubes 23. At the same time, the steam will be transported to the inner cavity of the shell 22 through the pipeline, where the wastewater is heated to boiling by the steam in the inner cavity of the shell 22, and then the wastewater begins to evaporate. The secondary steam generated is collected and used as a heat source for subsequent effect heating and transported to the inner cavity of the second evaporator component 2 close to the first evaporator component 3 through the pipeline, and then the above steps are repeated to perform secondary heating and evaporation on the wastewater. This process repeats the steps of evaporation and concentration, and the water content in the wastewater is further reduced, and the concentration continues to increase.

[0051] Example 3

[0052] like Fig.10 , Fig.11 As shown, on the basis of Example 2, the present invention provides a technical solution: preferably, the rotating component 38 includes a worm wheel 381 and a worm 382, ​​the worm 382 is meshingly connected with the adjacent worm 382, ​​the lower part of the worm 382 is rotatably connected with a connecting platform 383, the lower end of the connecting platform 383 is fixedly connected to the upper end of the inner shell 32, the inner cavity of the worm wheel 381 is fixedly connected to the threaded rod 34, the partition 33 is provided with a plurality of steam inlet holes 331 in an annular array, and the scraper 2 353 and the scraper 1 351 are both conical on one side close to the inner wall of the inner shell 32.

[0053] In this embodiment, similarly, the secondary steam generated by the second effect is also collected and transported to the lower part of the inner cavity of the second shell 31, and then the steam can be quickly and evenly transported to the gap between the upper part of the inner cavity of the second shell 31 and the outer surface of the inner shell 32 through a plurality of steam inlet holes 331, and then the inner shell 32 can be heated by the steam, and the concentrated wastewater is transported to the inner cavity of the inner shell 32 through the cooperation of pipes and water pumps. Here, the secondary steam generated by the second effect is used for heating, and the water in the wastewater is almost completely evaporated, the solute concentration reaches an extremely high level, and crystals begin to precipitate. The operating temperature and pressure of the first evaporator component 3 are usually low, which can avoid the damage of high temperature to heat-sensitive substances and promote the formation of crystals, and then The crystals are separated from the remaining concentrated liquid by a specific separation device such as a centrifuge, a crystallizer, etc. The separated crystals can be further processed or recycled as needed. Some crystals will adhere to the inner wall of the inner shell 32. In order to prevent these crystals from affecting the temperature transfer, they need to be processed. The motor can be controlled by the controller, and then the motor is used to drive the worm 382 to rotate. The worm 382 is then used to mesh with the adjacent worm wheel 381 to drive the worm wheel 381 to rotate. Then, the worm wheel 381 rotates, which can drive the threaded rod 34 to rotate, so that the threaded rod 34 can drive the two first cleaning components 35 to clean the upper part of the inner cavity of the inner shell 32 and the lower part of the inner cavity of the inner shell 32 respectively.

[0054] Example 4

[0055] like Figure 6 - Fig. 9 As shown, on the basis of Example 3, the present invention provides a technical solution: preferably, the first cleaning component 35 includes an annular block 354 and a plurality of scrapers 351, the plurality of scrapers 351 are fixedly connected to the threaded rod 34, the annular block 354 is fixedly slidably connected to the threaded rod 34, a plurality of scrapers 353 are fixedly connected to the outer surface of the annular block 354 in an annular array, and a plurality of connecting pipe components 352 are fixedly connected to the opposite surfaces of the scrapers 351 and the scrapers 353 on the same side, and the connecting pipe components 352 include a hollow tube 3521, a hollow tube 3522, and a hollow tube 3523. The outer surface of core tube one 3521 is fixedly connected to scraper one 351, the inner cavity of hollow tube one 3521 is slidably connected to hollow tube two 3522, the side of hollow tube two 3522 away from hollow tube one 3521 is fixedly connected to scraper two 353, the inner cavities of hollow tube one 3521 and hollow tube two 3522 are jointly fixedly connected with a spring 3523, a limiting groove 321 is provided on one side of the inner wall of the inner shell 32, and a slider 37 is fixedly connected to the side of scraper three 36 close to the limiting groove 321, and the outer surface of the slider 37 is slidably connected to the inner cavity of the limiting groove 321.

[0056] In the present embodiment, at the same time, when the threaded rod 34 rotates, it will drive the scraper three 36 to operate. Since a limiting groove 321 is provided on one side of the inner cavity of the inner shell 32, a slider 37 is fixedly connected to the side of the scraper three 36 close to the limiting groove 321. The slider 37 is slidably connected to the limiting groove 321, so that the position of the scraper three 36 can be limited to prevent the scraper three 36 from being driven to rotate by the threaded rod 34. Since the scraper three 36 and the threaded rod 34 are threadedly connected, when the threaded rod 34 rotates, the scraper three 36 can be driven to descend. When the scraper three 36 descends, the inner wall of the inner shell 32 can be cleaned, and the crystal content attached to the inner wall of the inner shell 32 can be reduced. After the scraper three 36 descends to a certain position, the scraper three 36 will contact the scraper two 353, and then under the action of the scraper three 36, the scraper two 353 will be driven to move toward the scraper one 351, and then the hollow tube two 3522 will be driven. It slides in the inner cavity of hollow tube one 3521, and then drives the spring 3523 to contract, so that when scraper three 36 moves, it can buffer the impact brought by the movement of scraper three 36, and avoid scraper three 36 from causing damage to the device during the lifting process. When scraper three 36 is away from scraper two 353, under the elastic force of spring 3523, it will push hollow tube two 3522 to move in the inner cavity of hollow tube one 3521, and then drive scraper two 353 to reset. Through the cooperation of the first cleaning component 35 and scraper three 36, the crystals attached to the inner wall of the inner shell 32 can be cleaned, thereby reducing the accumulation of crystals in the inner cavity of the inner shell 32, reducing or even avoiding the influence of crystals on the heat exchange efficiency between steam and liquid, affecting the evaporation rate, and avoiding excessive accumulation of crystals, which will then block the inside of the evaporator and seriously threaten the stable operation of the system, thereby improving the production stability of the device.

[0057] The working principle of the low-temperature multiple-effect evaporation concentration crystallization device for treating high-salt and phenol-containing wastewater is described in detail below.

[0058] like Figure 1 - Fig.12As shown, when it is necessary to perform low-temperature multi-effect evaporation, concentration and crystallization on wastewater, the wastewater can be transported to the filter through the cooperation of the pipeline and the water pump, and filtered through the filter to remove large suspended particles, impurities and some insoluble substances in the wastewater, so as to reduce scaling and clogging that may occur in the subsequent evaporation process. Then, the pretreated wastewater will be transported to the inner cavity of the second evaporator component 2 close to the filter side through the cooperation of the pipeline and the water pump, and then the wastewater will be transported from the inner cavity of the funnel 21 to the inner cavities of several evaporation membrane tubes 23. At the same time, the steam will be transported to the inner cavity of the shell 22 through the pipeline, where the wastewater is heated to boiling by the steam in the inner cavity of the shell 22, and then the wastewater begins to evaporate. The secondary steam generated is collected and used as a heat source for subsequent effect heating and transported to the inner cavity of the second evaporator component 2 close to the first evaporator component 3 through the pipeline, and then the above steps are repeated to perform secondary heating and evaporation on the wastewater. This process repeats the steps of evaporation and concentration, and the water content in the wastewater is further reduced, and the concentration continues to increase.

[0059] Similarly, the secondary steam generated by the second effect is also collected and transported to the lower part of the inner cavity of the second shell 31, and then the steam can be quickly and evenly transported to the gap between the upper part of the inner cavity of the second shell 31 and the outer surface of the inner shell 32 through a plurality of steam inlet holes 331, and then the inner shell 32 can be heated by the steam, and the concentrated wastewater is transported to the inner cavity of the inner shell 32 through the cooperation of pipes and water pumps. Here, the secondary steam generated by the second effect is used for heating, and the water in the wastewater is almost completely evaporated, the solute concentration reaches an extremely high level, and crystals begin to precipitate. The operating temperature and pressure of the first evaporator component 3 are usually low, which can avoid the damage of high temperature to heat-sensitive substances and promote the formation of crystals, and then the crystals The remaining concentrated liquid is separated by a specific separation device such as a centrifuge, a crystallizer, etc. The separated crystals can be further processed or recycled as needed. Some crystals will adhere to the inner wall of the inner shell 32. In order to prevent these crystals from affecting the temperature transfer, they need to be processed. The motor can be controlled by the controller to run, and then the motor is used to drive the worm 382 to rotate. The worm 382 is then used to mesh with the adjacent worm wheel 381 to drive the worm wheel 381 to rotate. Then, the worm wheel 381 rotates to drive the threaded rod 34 to rotate, so that the threaded rod 34 can drive the two first cleaning components 35 to clean the upper part of the inner cavity of the inner shell 32 and the lower part of the inner cavity of the inner shell 32 respectively.

[0060] At the same time, when the threaded rod 34 rotates, it will drive the scraper three 36 to operate. Since a limiting groove 321 is provided on one side of the inner cavity of the inner shell 32, and then a slider 37 is fixedly connected to the side of the scraper three 36 close to the limiting groove 321, and the slider 37 is slidably connected to the limiting groove 321, so that the position of the scraper three 36 can be limited to prevent the scraper three 36 from being driven to rotate by the threaded rod 34. Since the scraper three 36 and the threaded rod 34 are threadedly connected, when the threaded rod 34 rotates, the scraper three 36 can be driven to descend. When the scraper three 36 descends, the inner wall of the inner shell 32 can be cleaned, and the crystal content attached to the inner wall of the inner shell 32 can be reduced. After the scraper three 36 descends to a certain position, the scraper three 36 will contact the scraper two 353, and then under the action of the scraper three 36, the scraper two 353 will be driven to move toward the scraper one 351, and then the hollow tube two 3522 will be driven in the hollow When scraper three 36 moves away from scraper two 353, under the elastic force of spring 3523, hollow tube two 3522 is pushed to move in the inner cavity of hollow tube one 3521, and then scraper two 353 is driven to reset. Through the cooperation of the first cleaning component 35 and scraper three 36, crystals attached to the inner wall of the inner shell 32 can be cleaned, thereby reducing the accumulation of crystals in the inner cavity of the inner shell 32, reducing or even avoiding the influence of crystals on the heat exchange efficiency between steam and liquid and the evaporation rate, and avoiding excessive accumulation of crystals, which then blocks the inside of the evaporator and seriously threatens the stable operation of the system, thereby improving the production stability of the device.

[0061] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A low-temperature multiple-effect evaporation, concentration and crystallization device for treating high-salt and phenol-containing wastewater, comprising a support frame 1 (1) and a support frame 2 (4); characterized in that: The upper end of the support frame 1 (1) is fixedly connected to the lower end of the support frame 2 (4), two second evaporator assemblies (2) are fixedly connected to the middle of the support frame 1 (1), and the first evaporator assembly (3) is fixedly connected to one side of the support frame 1 (1); The first evaporator component (3) comprises an outer shell (31) and an inner shell (32); the inner cavity of the outer shell (31) is fixedly connected to the outer surface of the inner shell (32); a partition (33) is fixedly connected to the lower part of the inner cavity of the outer shell (31); a threaded rod (34) is rotatably connected to the middle part of the inner shell (32); a first cleaning component (35) is symmetrically rotatably connected to the upper part of the threaded rod (34) and the lower part of the threaded rod (34); a scraper (36) is threadedly connected to the middle part of the threaded rod (34); and a rotating component (38) is provided at the upper end of the inner shell (32); the rotating component (38) is used to drive the threaded rod (34) to rotate.

2. A low-temperature multiple-effect evaporation, concentration and crystallization device for treating high-salt and phenolic wastewater according to claim 1, characterized in that: The first cleaning component (35) comprises an annular block (354) and a plurality of scraper blades (351); the plurality of scraper blades (351) are fixedly connected to the threaded rod (34); the annular block (354) is fixedly slidably connected to the threaded rod (34); a plurality of scraper blades (353) are fixedly connected in an annular array on the outer surface of the annular block (354); and a plurality of connecting pipe components (352) are fixedly connected to the opposite surfaces of the scraper blades (351) and the scraper blades (353) on the same side.

3. A low-temperature multiple-effect evaporation, concentration and crystallization device for treating high-salt and phenolic wastewater according to claim 2, characterized in that: The connecting pipe assembly (352) comprises a hollow tube 1 (3521), the outer surface of the hollow tube 1 (3521) is fixedly connected to the scraper 1 (351), the inner cavity of the hollow tube 1 (3521) is slidably connected to the hollow tube 2 (3522), the side of the hollow tube 2 (3522) away from the hollow tube 1 (3521) is fixedly connected to the scraper 2 (353), and the inner cavities of the hollow tube 1 (3521) and the hollow tube 2 (3522) are fixedly connected to a spring (3523).

4. A low-temperature multiple-effect evaporation, concentration and crystallization device for treating high-salt and phenolic wastewater according to claim 1, characterized in that: A limiting groove (321) is provided on one side of the inner wall of the inner shell (32), a sliding block (37) is fixedly connected to one side of the scraper plate (36) close to the limiting groove (321), and an outer surface of the sliding block (37) is slidably connected to the inner cavity of the limiting groove (321).

5. The low-temperature multiple-effect evaporation, concentration and crystallization device for treating high-salt and phenolic wastewater according to claim 1, characterized in that: The rotating assembly (38) comprises a worm wheel (381) and a worm (382), wherein the worm (382) is meshedly connected with an adjacent worm (382), the lower portion of the worm (382) is rotatably connected with a connecting platform (383), the lower end of the connecting platform (383) is fixedly connected to the upper end of the inner shell (32), and the inner cavity of the worm wheel (381) is fixedly connected to the threaded rod (34).

6. A low-temperature multiple-effect evaporation, concentration and crystallization device for treating high-salt and phenolic wastewater according to claim 1, characterized in that: The partition plate (33) is provided with a plurality of steam inlet holes (331) in an annular array.

7. A low-temperature multiple-effect evaporation, concentration and crystallization device for treating high-salt and phenolic wastewater according to claim 1, characterized in that: The second evaporator assembly (2) comprises two funnels (21), the opposite surfaces of the two funnels (21) are fixedly connected to a shell one (22), the inner cavity of the shell one (22) is fixedly connected to a plurality of evaporation film tubes (23), and the inner cavities of the plurality of evaporation film tubes (23) are in communication with the inner cavities of the two funnels (21).

8. A low-temperature multiple-effect evaporation, concentration and crystallization device for treating high-salt and phenolic wastewater according to claim 2, characterized in that: The scraper plate 2 (353) and the scraper plate 1 (351) are both tapered on one side close to the inner wall of the inner shell (32).

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