Evaporative crystallization device for heavy salt water treatment

Abstract

The invention belongs to the technical field of water treatment, and discloses an evaporative crystallization device for heavy salt water treatment, the evaporative crystallization device comprises a pretreatment pool, a heating mechanism and a spiral conveying device, and the pretreatment pool is internally provided with a filtering mechanism and a mixing mechanism. According to the invention, compressed air is introduced from the bottom of the tank, bubbles rise to drive water to be mixed, and gas is discharged through the gas outlet holes, so that compressed air is introduced from the bottom of the pretreatment tank, and bubbles rise to drive water to be mixed; meanwhile, water vapor evaporated by the heating tank is conveyed into an air pump II through a water pump I and a conveying pipe III to assist in water body mixing, and compared with a traditional evaporative crystallization device for high-salinity water treatment, the evaporative crystallization device for high-salinity water treatment has the advantages that bubbles are generated at the water bottom through air outlet holes to drive water bodies to be mixed; therefore, the mixing effect of acid, alkali and wastewater is improved, local over-acidification / over-alkalinity is avoided, the reaction speed is increased, and precipitation and accumulation are prevented.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment, and specifically relates to an evaporation crystallization device for high-salt water treatment. Background Art

[0002] The evaporation crystallization device for high-salt water treatment is a key device for treating high-salt wastewater in the fields of industrial wastewater treatment, seawater desalination, chemical production, etc. Its core goal is to separate salts and water through evaporation and crystallization.

[0003] Traditional evaporation crystallization devices for high-salt water treatment have the following deficiencies: When traditional evaporation crystallization devices for high-salt water treatment are used, pretreatment is first carried out, followed by evaporation and concentration, then crystallization is precipitated, and then solid-liquid separation is carried out. However, during the pretreatment process, it is necessary to adjust the pH of the wastewater to 6-8 by adding acid (such as H2SO4) or alkali (such as NaOH) to reduce the corrosion risk. However, during the addition process, since the acid or alkali is generally directly poured into the pretreatment tank, the wastewater at the bottom may not be fully mixed with the acid or alkali, and a "high-concentration area" may be formed locally, resulting in equipment corrosion or incomplete reaction. Therefore, it needs to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide an evaporation crystallization device for high-salt water treatment to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An evaporation crystallization device for high-salt water treatment, including a pretreatment tank, a heating mechanism, and a screw conveyor. A filtering mechanism and a mixing mechanism are arranged inside the pretreatment tank. The mixing mechanism includes a long plate welded between the inner sides of the top end of the pretreatment tank. There are two long plates in total, and the two long plates are symmetrically installed. A cross plate is welded between the inner sides of the two long plates. An air pump two is fixedly installed above the pretreatment tank. Connecting pipes are welded to the inner sides of both ends of the air pump two. Vertical pipes are uniformly welded below the connecting pipes. The lower ends of the vertical pipes penetrate through the long plate and extend to the bottom of the pretreatment tank. Air outlet holes are uniformly arranged on the outer sides of the vertical pipes.

[0006] Preferably, the heating mechanism includes a heating tank. A conveying pipe one is welded to the rear end of the heating tank. The other end of the conveying pipe one penetrates through the right end of the pretreatment tank and extends into the pretreatment tank. A water pump one is fixedly installed above the heating tank. A conveying pipe three is welded to the left end of the water pump one. The other end of the conveying pipe three is welded to the rear side of the air pump two.

[0007] Preferably, the filtering mechanism includes rectangular plates welded to both inner ends of the pretreatment tank. A chute is provided inside the rectangular plate, and a filter plate is slidably installed inside the chute. Filter holes I are evenly formed at the left end of the filter plate, and filter holes II are evenly formed at the right end of the filter plate. The radius of the filter holes I is larger than that of the filter holes II.

[0008] Preferably, a storage tank is fixedly installed above the cross plate, and a one-way valve penetrating the cross plate is welded below the storage tank.

[0009] Preferably, a second conveying pipe is welded to the front side of the heating tank, and the other end of the second conveying pipe extends into the internal part of the screw conveying device.

[0010] Preferably, a limiting plate is welded above the filter plate, and a pulling plate is welded above the limiting plate.

[0011] Preferably, the air outlet holes are arranged in a circumferential array, and four air outlet holes are provided in each group.

[0012] Preferably, the length of the limiting plate is adapted to the width of the pretreatment tank, and the limiting plate is placed above the rectangular plate.

[0013] The beneficial effects of the present invention are as follows: 1. By introducing compressed air from the bottom of the tank, the present invention drives the water body to mix when the bubbles rise, and discharges the gas through the air outlet holes. Thus, compressed air is introduced from the bottom of the pretreatment tank, the water body is driven to mix when the bubbles rise, and at the same time, the water vapor evaporated by the heating tank is transmitted to the inside of the air pump II through the water pump I and the third conveying pipe to assist in the water body mixing. Compared with the traditional evaporation crystallization device for high-salt water treatment, the evaporation crystallization device for high-salt water treatment generates bubbles at the bottom of the water through the air outlet holes to drive the mixing between the water bodies, thereby improving the mixing effect of acid, alkali and wastewater, avoiding local over-acidity / over-alkalinity, accelerating the reaction speed, and preventing sediment accumulation. 2. By heating the wastewater with the heating tank, the present invention turns the water into water vapor and discharges it into the inside of the pretreatment tank through the water pump I to assist in the neutralization operation. At the same time, the heated concentrated liquid is discharged into the inside of the screw conveying device for heating evaporation crystallization transportation. Compared with the traditional evaporation crystallization device for high-salt water treatment, the evaporation crystallization device for high-salt water treatment discharges the water vapor generated by evaporation into the inside of the air pump II through the water pump I for secondary transportation, thereby saving energy loss. 3. The present invention filters wastewater by providing filter holes 1 and 2 with a larger size on the left and a smaller size on the right, so that the impurities after filtration accumulate inside the filter plate. Pulling the pull plate to take out the filter plate facilitates the cleaning of the impurities. Compared with the traditional evaporation crystallization device for high-salt water treatment, this evaporation crystallization device for high-salt water treatment collects impurities through the filter plate and pulls the pull plate to take out the filter plate for cleaning, which is convenient for the staff to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the mixing mechanism of the present invention; Figure 3 is Figure 2 a partial enlarged structural schematic diagram of part A in Figure 4 is a schematic diagram of the filtering mechanism of the present invention; Figure 5 is a schematic cross-sectional view of the filtering mechanism of the present invention in the horizontal direction; Figure 6 is a schematic diagram of the heating mechanism of the present invention.

[0015] In the figure: 1, pretreatment tank; 2, heating mechanism; 21, heating tank; 22, conveying pipe 1; 23, conveying pipe 2; 24, water pump 1; 25, conveying pipe 3; 3, screw conveyor; 4, filtering mechanism; 41, rectangular plate; 42, chute; 43, filter plate; 44, limiting plate; 45, pull plate; 46, filter hole 1; 47, filter hole 2; 5, mixing mechanism; 501, long plate; 502, cross plate; 503, storage tank; 504, one-way valve; 505, air pump 2; 506, connecting pipe; 507, vertical pipe; 508, air outlet hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] As Figures 1 to 6As shown in the figure, an evaporation crystallization device for high-salt water treatment provided by an embodiment of the present invention includes a pretreatment tank 1, a heating mechanism 2, and a spiral conveying device 3. A filtering mechanism 4 and a mixing mechanism 5 are arranged inside the pretreatment tank 1. The mixing mechanism 5 includes long plates 501 welded between the inner sides of the top end of the pretreatment tank 1. There are two long plates 501 in total, and the two long plates 501 are symmetrically installed. A cross plate 502 is welded between the inner sides of the two long plates 501. An air pump two 505 is fixedly installed above the pretreatment tank 1. Connecting pipes 506 are welded to the inner sides of both ends of the air pump two 505. Vertical pipes 507 are uniformly welded below the connecting pipes 506. The lower ends of the vertical pipes 507 penetrate through the long plates 501 and extend to the bottom of the pretreatment tank 1. Air outlet holes 508 are uniformly arranged on the outer sides of the vertical pipes 507.

[0018] Among them, when in use, first, the wastewater is filtered by the filtering mechanism 4, and then acid or alkali is added to the inside of the pretreatment tank 1 through the storage tank 503 and the one-way valve 504 for neutralization. The air outside is inhaled through the inlet of the air pump two 505, and then the gas is transported to the inside of the vertical pipe 507 through the connecting pipe 506, and the gas is discharged through the air outlet holes 508, so as to introduce compressed air from the bottom of the pretreatment tank 1. When the bubbles rise, they drive the water body to mix, thereby improving the mixing effect. The neutralized wastewater enters the inside of the heating tank 21 through the conveying pipe one 22 and is heated and evaporated by the heating tank 21. The evaporated water vapor is transmitted to the inside of the air pump two 505 through the water pump one 24 and the conveying pipe three 25, so that the water vapor is discharged from the air outlet holes 508 through the air pump two 505 to drive the water body to mix.

[0019] By introducing compressed air from the bottom of the pool, when the bubbles rise, they drive the water body to mix, and the gas is discharged through the air outlet holes 508, so as to introduce compressed air from the bottom of the pretreatment tank 1. When the bubbles rise, they drive the water body to mix. At the same time, the water vapor evaporated by the heating tank 21 is transmitted to the inside of the air pump two 505 through the water pump one 24 and the conveying pipe three 25 to assist in mixing the water body. Compared with the traditional evaporation crystallization device for high-salt water treatment, this evaporation crystallization device for high-salt water treatment generates bubbles at the bottom of the water through the air outlet holes 508 to drive the water body to mix, thereby improving the mixing effect of acid, alkali and wastewater, avoiding local over-acidity / over-alkalinity, accelerating the reaction speed, and preventing sediment accumulation.

[0020] As Figures 1 to 6 shown, the heating mechanism 2 includes a heating tank 21. A conveying pipe one 22 is welded to the rear end of the heating tank 21. The other end of the conveying pipe one 22 penetrates through the right end of the pretreatment tank 1 and extends to the inside of the pretreatment tank 1. A water pump one 24 is fixedly installed above the heating tank 21. A conveying pipe three 25 is welded to the left end of the water pump one 24. The other end of the conveying pipe three 25 is welded to the rear side of the air pump two 505.

[0021] Among them, the neutralized wastewater enters the interior of the heating tank 21 for heating. The water vapor generated by the heating rises and enters the interior of the first water pump 24, causing the first water pump 24 to drive the water vapor through the third conveying pipe 25 into the interior of the second air pump 505. The second air pump 505 inputs the water vapor to the bottom of the wastewater in the pretreatment tank 1, thereby generating bubbles to assist the neutralization process. The highly saline concentrated liquid after evaporation enters the interior of the screw conveying device 3 through the second conveying pipe 23, and the concentrated liquid is heated and transported by the screw conveying device 3, thereby evaporating to produce crystals.

[0022] The heating tank 21 heats the wastewater, turning the water into water vapor and discharging it through the first water pump 24 to the interior of the pretreatment tank 1 to assist the neutralization operation. At the same time, the heated concentrated liquid is discharged to the interior of the screw conveying device 3 for heating, evaporation, and crystallization transportation. Compared with the traditional evaporation and crystallization device for high-salt water treatment, this evaporation and crystallization device for high-salt water treatment discharges the water vapor generated by evaporation to the interior of the second air pump 505 through the first water pump 24 for secondary transportation, thereby saving energy loss.

[0023] As Figures 1 to 5 shown, the filtering mechanism 4 includes rectangular plates 41 welded to both ends inside the pretreatment tank 1. A sliding groove 42 is formed inside the rectangular plate 41, and a filter plate 43 is slidably installed inside the sliding groove 42. A first set of filtering holes 46 is evenly formed at the left end of the filter plate 43, and a second set of filtering holes 47 is evenly formed at the right end of the filter plate 43. The radius of the first set of filtering holes 46 is larger than the radius of the second set of filtering holes 47.

[0024] Among them, when the wastewater is filtered through the filter plate 43, since the radius of the first set of filtering holes 46 is larger than the radius at the second set of filtering holes 47, impurities enter the interior of the filter plate 43, and the filtered wastewater is discharged through the second set of filtering holes 47. When it is necessary to clean the interior of the filter plate 43, only the pull plate 45 needs to be pulled, causing the pull plate 45 to drive the limiting plate 44 to move upward, and the limiting plate 44 to drive the filter plate 43 out of the interior of the sliding groove 42, thereby pulling out the filter plate 43, which facilitates the cleaning and replacement of the filter plate 43.

[0025] By setting the first set of filtering holes 46 with a larger size on the left and the second set of filtering holes 47 with a smaller size on the right to filter the wastewater, the impurities after filtration accumulate inside the filter plate 43. Pulling the pull plate 45 to take out the filter plate 43 facilitates the cleaning of the impurities. Compared with the traditional evaporation and crystallization device for high-salt water treatment, this evaporation and crystallization device for high-salt water treatment collects impurities through the filter plate 43, and pulling the pull plate 45 to take out the filter plate 43 for cleaning is convenient for the staff to use.

[0026] As Figures 2 to 3As shown in the figure, a storage tank 503 is fixedly installed above the horizontal plate 502, and a one-way valve 504 passing through the horizontal plate 502 is welded below the storage tank 503.

[0027] Among them, acids and alkalis are poured into the interior of the pretreatment tank 1 through the storage tank 503, so that they are fully mixed with the wastewater and neutralize each other, improving the subsequent production efficiency.

[0028] As Figures 1 to 6 shown in the figure, a second conveying pipe 23 is welded on the front side of the heating tank 21, and the other end of the second conveying pipe 23 extends into the interior of the screw conveying device 3.

[0029] Among them, the high-salt concentrated liquid in the heating tank 21 is discharged into the interior of the screw conveying device 3 through the second conveying pipe 23, and is transported by the screw conveying device 3 for evaporation crystallization, which is convenient for use.

[0030] As Figure 4 shown in the figure, a limiting plate 44 is welded above the filter plate 43, and a pulling plate 45 is welded above the limiting plate 44.

[0031] Among them, by pulling the pulling plate 45, the pulling plate 45 drives the limiting plate 44 to move upward, so that the filter plate 43 is taken out of the interior of the sliding groove 42.

[0032] As Figure 3 shown in the figure, the air outlet holes 508 are arranged in a circumferential array, and a total of four air outlet holes 508 are provided in each group.

[0033] Among them, by arranging four air outlet holes 508 in each group to generate bubbles in the wastewater, the density of the generated bubbles is made uniform, improving the mixing effect.

[0034] As Figures 1 to 5 shown in the figure, the length of the limiting plate 44 is adapted to the width of the pretreatment tank 1, and the limiting plate 44 is placed above the rectangular plate 41.

[0035] Among them, by directly placing the limiting plate 44 above the rectangular plate 41, the filter plate 43 is limited, which is convenient for taking out the filter plate 43.

[0036] Working principle and usage process: When in use, the waste water is first filtered through the filtering mechanism 4, and then acid or alkali is added to the interior of the pretreatment tank 1 through the storage box 503 and the one-way valve 504 for neutralization, outdoor air is sucked in through the input port of the air pump 2 505, and then the gas is transported to the interior of the vertical pipe 507 through the connecting pipe 506, and the gas is discharged through the air outlet 508, so that compressed air is introduced from the bottom of the pretreatment tank 1, and the bubbles drive the water body to mix when they rise, thereby improving the mixing effect, and the neutralized waste water enters the interior of the heating tank 21 through the delivery pipe 1 22, and is heated and evaporated by the heating tank 21, and the evaporated water vapor is transmitted to the interior of the air pump 2 505 through the water pump 1 24 and the delivery pipe 3 25, so that the water vapor is discharged from the air outlet 508 through the air pump 2 505 to drive the water body to mix.

[0037] The neutralized wastewater enters the interior of the heating tank 21 for heating, and the water vapor generated by the heating rises and enters the interior of the water pump 24, so that the water pump 24 drives the water vapor through the conveying pipe 3 25 to enter the interior of the air pump 2 505, and the air pump 2 505 inputs the water vapor to the bottom of the wastewater in the pretreatment tank 1, thereby generating bubbles to assist the neutralization process, and the evaporated high-salt concentrate enters the interior of the screw conveying device 3 through the conveying pipe 2 23, and the concentrate is heated and transported by the screw conveying device 3, thereby evaporating and producing crystals.

[0038] When the waste water is filtered through the filter plate 43, since the radius of the filter hole 1 46 is larger than the radius of the filter hole 2 47, impurities enter the interior of the filter plate 43, and the filtered waste water is discharged through the filter hole 2 47. When the interior of the filter plate 43 needs to be cleaned, it is only necessary to pull the pull plate 45 so that the pull plate 45 drives the limit plate 44 to move upward, so that the limit plate 44 drives the filter plate 43 to disengage from the interior of the slide groove 42, thereby pulling the filter plate 43 out, thereby facilitating the cleaning and replacement of the filter plate 43.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An evaporation crystallization device for high-salt water treatment, comprising a pretreatment tank (1), a heating mechanism (2) and a screw conveying device (3), characterized in that: The pretreatment tank (1) is provided with a filtering mechanism (4) and a mixing mechanism (5) inside. The mixing mechanism (5) comprises a long plate (501) welded between the inner sides of the top of the pretreatment tank (1). There are two long plates (501) in total. The two long plates (501) are symmetrically installed. A horizontal plate (502) is welded between the inner sides of the two long plates (501). An air pump (505) is fixedly installed above the pretreatment tank (1). Connecting pipes (506) are welded to the inner sides of both ends of the air pump (505). Vertical pipes (507) are uniformly welded below the connecting pipes (506). The lower ends of the vertical pipes (507) penetrate the long plates (501) and extend to the bottom of the pretreatment tank (1). The outer sides of the vertical pipes (507) are uniformly provided with air outlet holes (508).

2. The evaporation crystallization device for high-salt water treatment according to claim 1, characterized in that: The heating mechanism (2) comprises a heating tank (21), a delivery pipe 1 (22) is welded to the rear end of the heating tank (21), the other end of the delivery pipe 1 (22) passes through the right end of the pretreatment tank (1) and extends into the interior of the pretreatment tank (1), a water pump 1 (24) is fixedly installed above the heating tank (21), a delivery pipe 3 (25) is welded to the left end of the water pump 1 (24), and the other end of the delivery pipe 3 (25) is welded to the rear side of the air pump 2 (505).

3. The evaporation crystallization device for high-salt water treatment according to claim 1, characterized in that: The filtering mechanism (4) comprises a rectangular plate (41) welded to the two ends of the inner side of the pretreatment tank (1); a slide groove (42) is provided on the inner side of the rectangular plate (41); a filter plate (43) is slidably mounted inside the slide groove (42); a filter hole 1 (46) is evenly provided at the left end of the filter plate (43); a filter hole 2 (47) is evenly provided at the right end of the filter plate (43); and the radius of the filter hole 1 (46) is greater than the radius of the filter hole 2 (47).

4. The evaporation crystallization device for high-salt water treatment according to claim 1, characterized in that: A storage box (503) is fixedly mounted above the transverse plate (502), and a one-way valve (504) penetrating the transverse plate (502) is welded below the storage box (503).

5. The evaporation crystallization device for high-salt water treatment according to claim 2, characterized in that: A second conveying pipe (23) is welded to the front side of the heating tank (21), and the other end of the second conveying pipe (23) extends to the interior of the spiral conveying device (3).

6. The evaporation crystallization device for high-salt water treatment according to claim 3, characterized in that: A limiting plate (44) is welded above the filter plate (43), and a pulling plate (45) is welded above the limiting plate (44).

7. The evaporation crystallization device for high-salt water treatment according to claim 1, characterized in that: The air outlet holes (508) are arranged in a circular array, and each group of air outlet holes (508) has four in total.

8. The evaporation crystallization device for high-salt water treatment according to claim 6, characterized in that: The length of the limiting plate (44) is adapted to the width of the pretreatment tank (1), and the limiting plate (44) is placed above the rectangular plate (41).

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