Multi-stage evaporation and concentration device for high-concentration wastewater

Abstract

The utility model belongs to the field of wastewater treatment, in particular relates to a multi-stage evaporation and concentration device for high-concentration wastewater, and aims to solve the problems that the normal operation and efficiency are influenced due to the fact that existing crystals are deposited at the bottom of an evaporator along with the flowing of the wastewater. In order to solve the problems that in the prior art, during cleaning, manual cleaning is needed, the efficiency is low, each tank body needs to be cleaned independently, and automatic operation is difficult to achieve to improve the efficiency, according to the scheme, the evaporation device comprises a plurality of evaporation tanks, feeding ends are arranged at the tops of the evaporation tanks, and discharging ends are arranged at the bottoms of the evaporation tanks; an air inlet end is arranged on one side of the outer wall of the evaporation tank, an air outlet end is arranged on the other side of the outer wall of the evaporation tank, when crystals on the inner wall of the evaporation tank need to be cleaned, only water needs to be injected into the evaporation tank indirectly, the crystals can be scraped and discharged together with water through the cleaning assembly, and therefore automatic cleaning is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a multi-stage evaporation and concentration device for high-concentration wastewater. Background Art

[0002] With the rapid development of industrialization, various industries generate a large amount of wastewater in the production process, including high-concentration wastewater. This type of wastewater contains high concentrations of organic matter, inorganic salts, heavy metals and other harmful substances. If directly discharged into the environment, it will seriously pollute the soil, water and air, posing a huge threat to the ecological environment and human health.

[0003] The multi-stage evaporation and concentration device achieves step-by-step evaporation and concentration of wastewater by connecting multiple evaporation units in series. In each evaporation unit, the wastewater exchanges heat with the heat source, and the evaporated water is recovered through the condensation system, while the concentrated wastewater enters the next evaporation unit for further treatment.

[0004] However, as the wastewater evaporates and concentrates, the minerals and salts dissolved in the wastewater will gradually reach a saturated state, and some crystals will be deposited at the bottom of the evaporator as the wastewater flows, thus affecting normal operation and efficiency. The existing cleaning method still requires manual cleaning, which is inefficient and requires each tank to be cleaned separately, making it difficult to achieve automated operation to improve efficiency. Utility Model Content

[0005] The purpose of the utility model is to solve the problem in the prior art that as the wastewater evaporates and concentrates, the minerals and salts dissolved in the wastewater will gradually reach a saturated state, and some crystals will be deposited at the bottom of the evaporator as the wastewater flows, thereby affecting normal operation and efficiency. The existing cleaning still has the disadvantages of low efficiency due to manual cleaning and the need to clean each tank separately, making it difficult to achieve automated operation to improve efficiency. A high-concentration wastewater multi-stage evaporation and concentration device is proposed.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A multi-stage evaporation and concentration device for high-concentration wastewater, comprising a plurality of evaporation tanks, wherein a feed end is provided at the top of each evaporation tank, a discharge end is provided at the bottom of each evaporation tank, an air inlet end is provided on one side of an outer wall of each evaporation tank, and an air outlet end is provided on the other side of the outer wall of each evaporation tank, wherein a first connecting pipe is fixedly connected between each air outlet end and an adjacent air inlet end, a three-way valve is fixedly connected at one end of each discharge end, a second connecting pipe is fixedly connected between one end of each three-way valve and an adjacent feed end, and a sewage pipe is fixedly connected at the other end of each three-way valve;

[0008] Concentrating components, used for concentrating wastewater, wherein the concentrating components are respectively arranged inside the plurality of evaporation tanks;

[0009] A cleaning assembly is used to clean crystals on the inner wall of the evaporation tank. The cleaning assembly is respectively arranged inside multiple evaporation tanks. The cleaning assembly includes multiple groups of scrapers, which are respectively arranged at the bottom of the interior of the multiple evaporation tanks. Each group of scrapers is composed of multiple scraping bars arranged in a ring.

[0010] In one possible design, the concentrating assembly includes multiple groups of heat exchangers respectively arranged inside multiple evaporation tanks, each group of the heat exchangers is composed of multiple heat exchange tubes arranged in a ring, and the top and bottom of the outer walls of the multiple heat exchange tubes are fixedly sleeved with the same connecting plate, and the scraper is located below the heat exchange tube.

[0011] In a possible design, the concentration assembly further includes a plurality of distributors respectively fixedly disposed inside the evaporation tank, and the distributors are located above the heat exchange tubes.

[0012] In a possible design, the cleaning assembly also includes a plurality of pressure plates respectively located inside the feed end, a sliding rod is fixedly provided at the bottom of the pressure plate, the bottom end of the sliding rod slides through the distributor and the connecting plate and extends to the bottom of the heat exchange tube, and the same connecting rod is fixedly provided between the multiple scraping strips located inside the same evaporator, a sliding cavity is provided at the bottom end of the sliding rod, the top end of the connecting rod extends to the inside of the sliding cavity, an annular inclined groove is provided on the outer wall of the connecting rod, a limit block is fixedly provided on the inner wall of the sliding cavity, and the limit block cooperates with the annular inclined groove.

[0013] In a possible design, an outer cylinder is fixedly provided at the bottom of the connecting plate, and the sliding rod passes through the outer cylinder. An inner cavity is opened inside the outer cylinder. The outer wall of the sliding rod located inside the inner cavity is fixedly sleeved with a sleeve plate, and the outer wall of the sliding rod is sleeved with a compression spring. The two ends of the compression spring are respectively fixed on the bottom of the sleeve plate and the bottom inner wall of the inner cavity.

[0014] In a possible design, the second connecting pipe is provided with a centrifugal pump.

[0015] In the present application, during specific use, the wastewater is heated and transported to the interior of the evaporation tank through the feed end, and then the wastewater enters the interior of multiple heat exchange tubes through the distributor, and the steam enters the interior of the evaporation tank through the air inlet end. At this time, the wastewater will be heat exchanged to evaporate and concentrate, and the gas enters the interior of the next evaporation tank through the air outlet end and the No. 1 connecting pipe. The concentrated wastewater is pumped through the discharge end and the No. 2 connecting pipe into the interior of the next evaporation tank for re-evaporation and concentration. After multi-stage evaporation, a large amount of water in the wastewater is removed to form a high-concentration concentrated liquid. When the bottom of the evaporation tank needs to be cleaned, the three-way valve at the bottom of the first evaporation tank is first controlled to connect the discharge end with the sewage pipe, and then water is indirectly added to the interior of the evaporation tank multiple times. When the water enters the interior of the feed end, it will The pressure plate is punched, so that the pressure plate presses the sliding rod downward. When the sliding rod moves downward, the internal limit block will move downward along the annular inclined slide groove, causing the connecting rod to rotate. The connecting rod drives multiple scraping bars to rotate, thereby scraping out the crystals at the bottom end of the evaporator. The sliding rod is reset by the compression spring, thereby driving the scraping bars to reset for a second scraping. Through multiple indirect water injections, the crystals on the inner wall of the evaporator are scraped off and discharged together with the water through the drain pipe. After that, the three-way valve at the bottom end of one evaporator is reset, and the three-way valve at the bottom end of the second evaporator is connected to the drain pipe, and water is continued to be injected indirectly, thereby cleaning the inner wall of the evaporator. By controlling the water injection frequency and water injection amount and the connecting end of the corresponding three-way valve, cleaning can be automatically achieved without manual cleaning, achieving a certain degree of systematic operation.

[0016] In the utility model, the multi-stage evaporation and concentration device for high-concentration wastewater can achieve the effect of multi-stage evaporation and concentration of high-concentration wastewater by using the concentration component. When the wastewater enters the interior of the evaporation tank, it will be subjected to heat exchange treatment by steam, thereby achieving evaporation and concentration. The steam can then be used for heat exchange in the next stage, and the concentrated wastewater will continue to be transported to the interior of the next evaporation tank for the next stage of evaporation and concentration, thereby achieving the effect of multi-stage evaporation and concentration of high-concentration wastewater.

[0017] In the present invention, the multi-stage evaporation and concentration device for high-concentration wastewater can achieve the goal of automatically driving the scraper inside the evaporation tank to rotate by indirectly injecting water, thereby scraping off the crystals on the inner wall thereof and discharging them together with the water, thereby achieving a cleaning effect on the inner wall;

[0018] In the present invention, when in use, steam and heated wastewater enter the interior of the evaporation tank through the air inlet end and the feed end respectively, and then pass through the heat exchange tubes of the concentration component to cause the wastewater to evaporate and concentrate. The wastewater and steam generated are then input into the interior of the next stage evaporation tank again to repeat the process, thereby achieving a multi-stage concentration effect.

[0019] When it is necessary to clean the crystals on the inner wall of the evaporation tank, it is only necessary to indirectly inject water into the evaporation tank. The crystals can be scraped off and discharged together with the water through the cleaning component, thereby realizing automatic cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the main structure of a high-concentration wastewater multi-stage evaporation and concentration device proposed by the utility model;

[0021] Figure 2 This is a schematic cross-sectional view of an evaporation tank of a high-concentration wastewater multi-stage evaporation and concentration device proposed in the present invention;

[0022] Figure 3 For this utility model Figure 2 A magnified view of the structure of part A;

[0023] Figure 4 This is a schematic diagram of the exploded cross-section structure of a sliding cavity of a high-concentration wastewater multi-stage evaporation and concentration device proposed by the utility model.

[0024] In the figure: 1. Evaporator; 2. Discharge end; 3. Three-way valve; 4. Air outlet; 5. Connecting pipe No. 1; 6. Connecting pipe No. 2; 7. Feed end; 8. Air inlet; 9. Heat exchange tube; 10. Scraper; 11. Slide rod; 12. Pressure plate; 13. Distributor; 14. Sleeve plate; 15. Outer cylinder; 16. Slide cavity; 17. Connecting rod; 18. Inner cavity; 19. Compression spring; 20. Limit block; 21. Annular inclined slide groove. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example

[0026] Reference Figure 1 A multi-stage evaporation and concentration device for high-concentration wastewater, used in wastewater treatment, comprises multiple evaporation tanks 1. Each evaporation tank is designed with a feed port 7 at the top to receive the wastewater to be treated and a discharge port 2 at the bottom to discharge the concentrated wastewater or waste residue. An air inlet 8 is provided on one side of the outer wall of the evaporation tank 1 for introducing hot steam or hot air, while an air outlet 4 is provided on the other side for discharging the evaporated gas. Adjacent evaporation tanks are connected by a connecting pipe 5, connecting the air outlet 4 of the previous evaporation tank to the air inlet 8 of the next evaporation tank, forming a multi-stage evaporation system.

[0027] A three-way valve 3 is installed at the discharge end 2 of each evaporation tank 1. One end of the three-way valve is connected to the feed end 7 of the adjacent evaporation tank via a second connecting pipe 6, forming a path for the wastewater to circulate step by step. The other end is connected to a drain pipe to remove crystals formed on the inner wall of the tank. A centrifugal pump is installed in the second connecting pipe 6 to ensure smooth flow of wastewater between the various evaporation tanks.

[0028] Reference Figure 2 Inside the evaporator 1, multiple sets of heat exchange tubes 9 are arranged in a ring and secured to the inner wall of the evaporator via connecting plates. These heat exchange tubes heat the wastewater, promoting evaporation. To further improve evaporation efficiency, each evaporator is also equipped with a distributor 13 above the heat exchange tubes 9. This distributor evenly distributes the incoming wastewater, ensuring sufficient contact between the wastewater and the heat exchange tubes. Example

[0029] refer to Figure 3-4 , based on Example 1, an improvement: To solve the problem of inner wall crystallization during the evaporation process, this device is also designed with a cleaning component. The cleaning component includes multiple groups of scrapers 10, each group of scrapers consisting of multiple scrapers arranged in a ring and located at the bottom of the evaporator. In addition, a pressure plate 12 is provided inside the feed end 7, and the bottom of the pressure plate is connected to a slide rod 11. The slide rod passes through the distributor 13, the connecting plate and the outer cylinder 15, and finally extends to the bottom of the heat exchange tube. The scrapers are connected by a connecting rod 17. The top of the connecting rod 17 extends into the sliding cavity 16 at the bottom of the slide rod 11. The annular inclined groove 21 on the outer wall of the connecting rod 17 cooperates with the limit block 20 to realize the automatic extension and retraction cleaning function of the scraper when under pressure. At the same time, the outer wall of the slide rod 11 inside the inner cavity 18 is provided with a sleeve plate 14. A compression spring 19 is provided between the sleeve plate 14 and the inner cavity 18 to restore the scraper position when not under pressure.

[0030] Specifically, after being heated, the wastewater is transported to the interior of the evaporation tank 1 through the feed end 7, and then the wastewater enters the interior of multiple heat exchange tubes 9 through the distributor 13, and the steam enters the interior of the evaporation tank 1 through the air inlet end 8. At this time, the wastewater will undergo heat exchange to evaporate and concentrate, and the gas will enter the interior of the next evaporation tank 1 through the air outlet end 4 and the No. 1 connecting pipe 5. The concentrated wastewater is pumped through the discharge end 2 and the No. 2 connecting pipe 6 to enter the interior of the next evaporation tank 1 for re-evaporation and concentration. After multi-stage evaporation, a large amount of water in the wastewater is removed to form a high-concentration concentrated liquid. When it is necessary to clean the bottom of the evaporation tank 1, the three-way valve 3 at the bottom of the first evaporation tank 1 is first controlled to connect the discharge end 2 to the sewage pipe, and then water is indirectly added to the interior of the evaporation tank 1 multiple times. When the water enters the interior of the feed end 7, it will punch the pressure plate 12. The pressure plate 12 presses the slide bar 11 downward. When the slide bar 11 moves downward, the internal limit block 20 moves downward along the annular inclined slide groove 21, causing the connecting rod 17 to rotate. The connecting rod 17 drives the multiple scraping strips 10 to rotate, thereby scraping out the crystals at the bottom end of the evaporation tank 1. The slide bar 11 is reset by the compression spring 19, thereby driving the scraping strips 10 to reset for a second time. Through multiple indirect water injections, the crystals on the inner wall of the evaporation tank 1 are scraped off and discharged together with the water through the drain pipe. After that, the three-way valve 3 at the bottom end of one evaporation tank 1 is reset, and the three-way valve 3 at the bottom end of the second evaporation tank 1 is connected to the drain pipe, and the indirect water injection is continued, thereby achieving the cleaning of the inner wall of the evaporation tank 1. By controlling the water injection frequency and water injection amount and the connecting end of the corresponding three-way valve 3, cleaning can be automatically achieved without manual cleaning, achieving a certain systematic operation.

[0031] However, as is well known to those skilled in the art, the working principle and wiring method of a centrifugal pump are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art can make any selection according to their needs or convenience.

[0032] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-stage evaporation and concentration device for high-concentration wastewater, characterized in that: include: A plurality of evaporation tanks (1), wherein a feed end (7) is provided at the top of each evaporation tank (1), a discharge end (2) is provided at the bottom of each evaporation tank (1), an air inlet end (8) is provided on one side of an outer wall of each evaporation tank (1), and an air outlet end (4) is provided on the other side of an outer wall of each evaporation tank (1), wherein the air outlet end (4) and an adjacent air inlet end (8) are fixedly connected to a same No. 1 connecting pipe (5), one end of each discharge end (2) is fixedly connected to a three-way valve (3), one end of each three-way valve (3) and an adjacent feed end (7) are fixedly connected to a same No. 2 connecting pipe (6), and the other end of each three-way valve (3) is fixedly connected to a sewage pipe; Concentration components, used for concentrating wastewater, wherein the concentration components are respectively arranged inside the plurality of evaporation tanks (1); A cleaning assembly is used to clean crystals on the inner wall of an evaporation tank (1), wherein the cleaning assembly is respectively arranged inside a plurality of evaporation tanks (1), and the cleaning assembly comprises a plurality of groups of scrapers, wherein the plurality of groups of scrapers are respectively arranged at the bottom of the interior of the plurality of evaporation tanks (1), and each group of scrapers is composed of a plurality of scraping strips (10) arranged in a ring.

2. A high-concentration wastewater multi-stage evaporation and concentration device according to claim 1, characterized in that: The concentration assembly comprises a plurality of groups of heat exchangers respectively arranged inside a plurality of evaporation tanks (1), each group of the heat exchangers being arranged in a ring-shaped arrangement by a plurality of heat exchange tubes (9), and the tops and bottoms of the outer walls of the plurality of heat exchange tubes (9) are fixedly sleeved with the same connecting plate, and the scraper (10) is located below the heat exchange tubes (9).

3. A high-concentration wastewater multi-stage evaporation and concentration device according to claim 2, characterized in that: The concentration assembly further comprises a plurality of distributors (13) respectively fixedly arranged inside the evaporation tank (1), wherein the distributors (13) are located above the heat exchange tubes (9).

4. A high-concentration wastewater multi-stage evaporation and concentration device according to claim 3, characterized in that: The cleaning assembly further comprises a plurality of pressure plates (12) respectively located inside the feed end (7), a slide rod (11) is fixedly provided at the bottom of the pressure plate (12), the bottom end of the slide rod (11) slides through the distributor (13) and the connecting plate and extends to the bottom of the heat exchange tube (9), a same connecting rod (17) is fixedly provided between the plurality of scrapers (10) located inside the same evaporator (1), a slide cavity (16) is provided at the bottom end of the slide rod (11), the top end of the connecting rod (17) extends to the inside of the slide cavity (16), an annular inclined slide groove (21) is provided on the outer wall of the connecting rod (17), a limit block (20) is fixedly provided on the inner wall of the slide cavity (16), and the limit block (20) cooperates with the annular inclined slide groove (21).

5. A high-concentration wastewater multi-stage evaporation and concentration device according to claim 4, characterized in that: An outer cylinder (15) is fixedly provided at the bottom of the connecting plate, and the slide rod (11) passes through the outer cylinder (15). An inner cavity (18) is provided inside the outer cylinder (15). The outer wall of the slide rod (11) located inside the inner cavity (18) is fixedly sleeved with a sleeve plate (14). The outer wall of the slide rod (11) is sleeved with a compression spring (19). The two ends of the compression spring (19) are respectively fixedly provided on the bottom of the sleeve plate (14) and the inner wall of the bottom of the inner cavity (18).

6. A high-concentration wastewater multi-stage evaporation and concentration device according to claim 1, characterized in that: The second connecting pipe (6) is provided with a centrifugal pump.

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