Neutralization reaction tank structure and composite alkali adding system

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a neutralization reaction tank structure and a compound alkali adding system. According to the neutralization reaction tank structure, the partition plate and the dispersion plate are arranged in the reaction tank, the water passing gap between the partition plate and the bottom wall of the reaction tank can enable reaction liquid in the reaction tank to form convection, and the added compound alkali is in contact with the dispersion plate at a certain speed and is fully diffused, so that the agglomeration of the compound alkali is reduced, and the reaction efficiency is improved. The reaction of the compound alkali is more sufficient, the utilization rate is higher, and the precipitation effect is better. According to the compound alkali adding system, on one hand, agglomeration of compound alkali can be reduced through the partition plate and the dispersion plate arranged in the reaction tank, and on the other hand, when the compound alkali is added, part of liquid compound alkali can flow back to the medicine storage barrel to form convection with the liquid compound alkali in the medicine storage barrel by additionally arranging the backflow pipe; therefore, the liquid compound alkali in the chemical storage barrel is uniform, and the pipeline of the feeding system is not easy to scale.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment, specifically to a neutralization reaction tank structure and a composite alkali dosing system. Background Technology

[0002] Compound alkali is a strongly alkaline substance, generally used in wastewater treatment to neutralize the acidity and alkalinity of wastewater, adjust the pH value, and also remove heavy metals. The acidity of wastewater is mainly due to the presence of H+ in the water. + Excessive ions, and when a compound alkali is added, the OH groups produced by the hydrolysis of the compound alkali... - Ions readily react with it to form water, making water neutral; the principle behind this is acid-base neutralization.

[0003] Liquid compound alkali has advantages such as easy dosing, low cost, and good effect, and is showing a certain application trend in the current wastewater treatment industry. Currently, most industry practices involve directly adding liquid compound alkali to the neutralization reaction tank containing wastewater. However, since the main component of liquid compound alkali is calcium hydroxide, it is prone to agglomeration. The compound alkali located within the agglomerates has difficulty contacting the wastewater, resulting in low utilization of the compound alkali. Existing patent CN107519819A discloses a scheme that adds alkali solution to the neutralization reaction tank in batches through two dosing pipes. This scheme increases the sedimentation time and improves the sedimentation effect to some extent, but it still cannot solve the problem of easy agglomeration of the compound alkali after it is added to the neutralization reaction tank.

[0004] Furthermore, because liquid compound alkali is prone to agglomeration, it easily separates into layers due to sedimentation when stored in the storage tank, leading to uneven concentration of compound alkali within the tank. Excessive sedimentation can also clog the delivery pipeline during dosing. Existing patent CN210410624U discloses a solution to the clogging problem by adding a circulation line and a return pipe, but it does not fundamentally address the issue of uneven compound alkali concentration within the storage tank. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model first provides a neutralization reaction tank structure. The partition plate and dispersion plate in this neutralization reaction tank structure can reduce the agglomeration of liquid composite alkali, making the reaction of liquid composite alkali more complete, with higher utilization and better precipitation effect.

[0006] The neutralization reaction tank structure includes a reaction tank, and a partition plate is provided inside the reaction tank to divide the interior of the reaction tank into a first reaction zone and a second reaction zone; a water passage gap is provided between the bottom of the partition plate and the bottom wall of the reaction tank, and the water passage gap connects the first reaction zone and the second reaction zone; at least one dispersion plate is provided in both the first reaction zone and the second reaction zone, and the dispersion plate is set at a certain angle to the bottom wall of the reaction tank.

[0007] In one specific embodiment, the dispersion plate is located above the water passage gap.

[0008] In one specific embodiment, the dispersion plate is disposed on the side wall of the partition plate and / or the inner wall of the reaction tank.

[0009] In one specific embodiment, the top end of the dispersion plate is a connecting end, and the bottom end of the dispersion plate is a free end.

[0010] In one specific embodiment, the obtuse angle formed between the dispersion plate and the bottom wall of the reaction tank is 120° to 150°.

[0011] In one specific embodiment, the reaction tank, the partition plate, and the dispersion plate (5) are all made of steel plate.

[0012] In one specific embodiment, it further includes a first dosing tube and a second dosing tube. The first dosing tube is disposed at the top of the first reaction zone, and the second dosing tube is disposed at the top of the second reaction zone. The inlet ends of both the first dosing tube and the second dosing tube are connected to a drug delivery tube. The outlet of the first dosing tube faces the dispersion plate in the first reaction zone, and the outlet of the second dosing tube faces the dispersion plate in the second reaction zone.

[0013] In one specific embodiment, both the first dosing tube and the second dosing tube are equipped with a switching valve.

[0014] The beneficial effects of the neutralization reaction tank structure provided by this utility model are as follows: By setting a partition plate and a dispersion plate in the reaction tank, the water passage gap between the partition plate and the bottom wall of the reaction tank allows the reaction liquid in the reaction tank to form convection, which makes the composite alkali diffuse more fully. When the added composite alkali comes into contact with the dispersion plate at a certain speed, it will also be fully diffused, thereby reducing the agglomeration of the composite alkali, making the reaction of the composite alkali more complete, the utilization rate higher, and the precipitation effect better.

[0015] This utility model also provides a compound alkali dosing system, including: a storage tank, a first pump, a dilution tank, a second pump, and the above-mentioned neutralization reaction tank structure connected in sequence by pipes; a return pipe is also connected to the pipe between the first pump and the dilution tank, the other end of the return pipe is connected to the top of the storage tank, and the inlet end of the dilution tank is also connected to a tap water pipe.

[0016] In one specific embodiment, two medicine storage tanks are arranged side by side, and the outlets of the two medicine storage tanks are connected to the first liquid pump through a Y-shaped pipe or a T-shaped pipe. The tops of the two medicine storage tanks are connected to the return pipe.

[0017] The beneficial effects of the compound alkali dosing system provided by this utility model are as follows: Firstly, the partition plate and dispersion plate installed in the reaction tank can reduce the agglomeration of compound alkali, making the reaction of compound alkali more complete, the utilization rate higher, and the precipitation effect better. Secondly, by connecting a return pipe to the pipeline between the first liquid pump and the dilution tank, and connecting the other end of the return pipe to the top of the storage tank, some liquid compound alkali is returned to the storage tank during compound alkali dosing, forming convection with the liquid compound alkali in the storage tank, thereby making the liquid compound alkali in the storage tank uniform and making the pipeline of the dosing system less prone to scaling. Attached Figure Description

[0018] Figure 1 This is a structural diagram of a reaction tank according to an embodiment of the present invention.

[0019] Figure 2 This is a structural diagram of a composite alkali dosing system according to an embodiment of the present invention.

[0020] Figure reference numerals: reaction tank 1, partition plate 2, first reaction zone 3, second reaction zone 4, dispersion plate 5, first dosing pipe 6, second dosing pipe 7, delivery pipe 8, storage tank 9, first pump 10, dilution tank 11, second pump 12, return pipe 13, tap water pipe 14, electric agitator 15, level gauge 16. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] The neutralization reaction tank structure provided by this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1:

[0024] Please see Figure 1 In an embodiment of the neutralization reaction tank structure provided by this utility model, the neutralization reaction tank structure includes a reaction tank 1. A partition plate 2 is provided inside the reaction tank 1, dividing the interior of the reaction tank 1 into a first reaction zone 3 and a second reaction zone 4. A water-passing gap is provided between the bottom of the partition plate 2 and the bottom wall of the reaction tank 1, connecting the first reaction zone 3 and the second reaction zone 4. Two dispersion plates 5 are provided in the first reaction zone 3. One dispersion plate 5 is located at the bottom end of the side wall of the partition plate 2, and the other dispersion plate 5 is located opposite it on the inner wall of the reaction tank 1. Both dispersion plates 5 have a connecting end at the top and a free end at the bottom, forming an inverted "V" shape, allowing the composite alkali to continue flowing downwards along the dispersion plate 5 after contacting it. To reduce the influence of the dispersion plate 5 on the flowability of the composite alkali within the reaction tank 1, both sides of the dispersion plate 5 are also free ends, meaning that gaps are left between both sides of the dispersion plate 5 and the inner wall of the reaction tank 1. The obtuse angles formed between the two dispersion plates 5 and the bottom wall of the reaction tank 1 are both 120°, meaning the two dispersion plates 5 are symmetrically arranged. This large angle arrangement effectively ensures that the composite alkali can continue to flow downwards along the dispersion plates 5. Two dispersion plates 5 are also provided in the second reaction zone 4, and their arrangement is exactly the same as that of the two dispersion plates 5 in the first reaction zone 3, so it will not be described again. The reaction tank 1, the partition plate 2, and the dispersion plates 5 are all made of a single piece of steel plate.

[0025] By setting up a partition plate 2 and a dispersion plate 5 in the reaction tank 1, when the compound alkali is added, the water passage gap between the partition plate 2 and the bottom wall of the reaction tank 1 allows the reaction liquid in the reaction tank 1 to form convection, making the compound alkali diffuse more fully. In addition, when the added liquid compound alkali comes into contact with the dispersion plate 5 at a certain speed, it will also be fully diffused, thereby reducing the agglomeration of the liquid compound alkali, making the reaction of the liquid compound alkali more complete, the utilization rate higher, and the precipitation effect better.

[0026] The dispersion plate 5 is located above the water gap. Since the compound alkali is added to the reaction tank 1 at a certain speed, which is faster than the convection speed of the compound alkali in the water gap, the compound alkali is first dispersed by the dispersion plate 5 at a faster speed in the reaction tank 1, and then further dispersed by convection at the water gap. This makes the liquid compound alkali more thoroughly dispersed and the reaction more complete.

[0027] The neutralization reaction tank structure also includes a first dosing pipe 6 and a second dosing pipe 7. The first dosing pipe 6 is located at the top of the first reaction zone 3, and the second dosing pipe 7 is located at the top of the second reaction zone 4. Both the first dosing pipe 6 and the second dosing pipe 7 have a Y-shaped structure. The liquid inlet of both the first dosing pipe 6 and the second dosing pipe 7 are connected to a drug delivery pipe 8. The two outlets of the first dosing pipe 6 face the two dispersion plates 5 in the first reaction zone 3, and the two outlets of the second dosing pipe 7 face the dispersion plates 5 in the second reaction zone 4. By using the first dosing pipe 6 and the second dosing pipe 7 to add liquid compound alkali to the first reaction zone 3 and the second reaction zone 4 respectively, the addition of liquid compound alkali is more convenient and the dosage is stable and easy to control. By arranging the first dosing pipe 6 and the second dosing pipe 7 into a Y-shaped structure, the liquid compound alkali is divided into two streams, which can initially disperse the liquid compound alkali in the dosing pipe to a certain extent. Then, the liquid compound alkali enters the reaction tank 1 at a relatively fast speed and comes into contact with the dispersion plate 5, where it is dispersed again. This allows the liquid compound alkali to react more fully with the wastewater in the reaction tank 1, resulting in better sedimentation. Both the first dosing pipe 6 and the second dosing pipe 7 are equipped with on / off valves to facilitate the batch and quantitative dosing of liquid compound alkali.

[0028] Example 2:

[0029] Unlike Example 1, both the first reaction zone 3 and the second reaction zone 4 are equipped with only one dispersion plate 5, and the corresponding first dosing pipe 6 and second dosing pipe 7 are also equipped with only one outlet. Moreover, the dispersion plate 5 is located at the bottom end of the side wall of the partition plate 2, and the obtuse angle formed between the dispersion plate 5 and the bottom wall of the reaction tank 1 is 150°. Both the partition plate 2 and the dispersion plate 5 are detachably connected to the reaction tank 1 by bolts, which facilitates the adjustment of the position of the partition plate 2 or the periodic cleaning of the partition plate 2 and the dispersion plate 5 as needed.

[0030] Example 3:

[0031] Unlike Example 2, the dispersion plate 5 is set on the inner wall of the reaction tank 1, and the obtuse angle formed between the dispersion plate 5 and the bottom wall of the reaction tank 1 is 135°. Both the partition plate 2 and the dispersion plate 5 are provided with a hanging part, and both the partition plate 2 and the dispersion plate 5 are hung on the reaction tank 1, making it easier to assemble and disassemble the partition plate 2 and the dispersion plate 5.

[0032] Example 4:

[0033] Unlike Example 2, the dispersion plate 5 of the first reaction zone 3 is located at the bottom of the side wall of the partition plate 2, while the dispersion plate 5 of the second reaction zone 4 is located on the inner wall of the reaction tank 1 opposite to the partition plate. This results in a longer convection path of the liquid composite alkali below the dispersion plate 5 and the partition plate 2, allowing for a more complete reaction.

[0034] In summary, the neutralization reaction tank structure provided by this utility model, by setting a partition plate 2 and a dispersion plate 5 in the reaction tank 1, allows the reaction liquid in the reaction tank 1 to form convection through the water-passing gap between the partition plate 2 and the bottom wall of the reaction tank 1, so that the liquid composite alkali diffuses more fully. When the added liquid composite alkali comes into contact with the dispersion plate 5 at a certain speed, it will also be fully diffused, thereby reducing the agglomeration of the liquid composite alkali, making the reaction of the liquid composite alkali more complete, the utilization rate higher, and the precipitation effect better.

[0035] Please see Figure 2 This utility model also provides a compound alkali dosing system, which includes: a storage tank 9, a first pump 10, a dilution tank 11, and a second pump 12 connected in sequence by pipes. The second pump 12 is connected to the first dosing pipe 6 and the second dosing pipe 7 through a delivery pipe 8. The first dosing pipe 6 and the second dosing pipe 7 are respectively connected to the top of the first reaction zone 3 and the second reaction zone 4 of the reaction tank 1. A return pipe 13 is also connected to the pipe between the first pump 10 and the dilution tank 11. The other end of the return pipe 13 is connected to the top of the storage tank 9. The inlet end of the dilution tank 11 is also connected to a water pipe 14. The water pipe 14 is equipped with a solenoid valve and a ball valve to facilitate automatic control of the water pipe 14 to deliver or stop delivering water. Switch valves are installed on the inlet and outlet pipes of the first liquid pump 10, the inlet and outlet pipes of the second liquid pump 12, the outlet and return pipes of the drug storage tank 9, the first dosing pipe 6 and the second dosing pipe 7, so as to facilitate the control of the liquid flow or cut-off in each part of the pipes.

[0036] In this embodiment, a ball valve is used as the switching valve. Of course, in other embodiments, a butterfly valve can also be used as the switching valve.

[0037] The storage tank 9 can be a single unit or multiple units arranged side-by-side. In this embodiment, two storage tanks 9 are arranged side-by-side, with their outlets connected to the first pump 10 via T-tubes. The tops of both storage tanks 9 are connected to the return pipe 13. In other embodiments, the outlets of the two storage tanks 9 can also be connected to the first pump 10 via Y-tubes. The liquid compound alkali discharged from the two storage tanks 9 can form collision convection at the junction of the T-tubes or Y-tubes. This collision convection can also disperse the agglomerated compound alkali to a certain extent, reducing agglomeration and allowing the compound alkali to react fully with the wastewater when it subsequently flows into the neutralization reaction tank.

[0038] In this embodiment, both the storage tank 9 and the dilution tank 11 are made of PE material for corrosion protection. Of course, in other embodiments, the storage tank 9 and the dilution tank 11 can also be made of carbon steel for corrosion protection.

[0039] In this embodiment, the first pump 10 is a diaphragm pump, and its flow rate is 1.2-2 times the required flow rate of the liquid compound alkali to be delivered to the dilution tank 11. Of course, in other embodiments, the first pump 10 can also be a variable frequency pump. The second pump can also be a diaphragm pump or a variable frequency pump.

[0040] In this embodiment, the dilution tank 11 is equipped with an electric agitator 15 and a level gauge 16, both of which are implemented using existing structures. When the level gauge 16 detects that the liquid level in the dilution tank 11 is lower than the system-set liquid level, the solenoid valve of the tap water pipe 14 opens, the first liquid pump 10 starts working, and the dosing process begins, realizing automatic dosing and maintaining the concentration of the compound alkali in the dilution tank 11 at 5% to 15%.

[0041] When the compound alkali dosing system is working, a high-concentration liquid compound alkali is first stored in the storage tank 9. By controlling the opening of each switch valve and operating the first liquid pump 10, a portion of the high-concentration compound alkali is transported to the dilution tank 11, while the remaining portion flows back to the storage tank through the return pipe 13. By controlling the opening of the ball valve on the water pipe 14 and opening the solenoid valve on the water pipe 14, tap water is added to the dilution tank 11. The tap water mixes with the high-concentration compound alkali to form a low-concentration compound alkali. The low-concentration compound alkali is then pumped by the second liquid pump 12 into the delivery pipe 8, and then added to the first reaction zone 3 and the second reaction zone 4 of the reaction tank 1 via the first dosing pipe 6 and the second dosing pipe 7, respectively. When adding compound alkali, the pH value of the wastewater in the reaction tank 1 can be measured first. If the pH of the wastewater is >5, only one of the switch valves on the first dosing pipe 6 and the second dosing pipe 7 needs to be opened to achieve the required pH level for the wastewater in the reaction tank 1. If the pH of the wastewater is less than 5, or if obvious flocs are visible in the reaction tank 1, the valves of both the first dosing pipe 6 and the second dosing pipe 7 can be opened, and the wastewater can be added in batches to improve the neutralization reaction efficiency and achieve the required pH level for the wastewater in the reaction tank 1.

[0042] In summary, the compound alkali dosing system provided by this utility model, on the one hand, reduces the agglomeration of liquid compound alkali by setting the partition plate and dispersion plate in the reaction tank, making the reaction of liquid compound alkali more complete, the utilization rate higher, and the precipitation effect better. On the other hand, by connecting a return pipe to the pipeline between the first liquid pump and the dilution tank, and the other end of the return pipe is connected to the top of the storage tank, some liquid compound alkali flows back to the storage tank during liquid alkali dosing, causing convection of liquid compound alkali in the storage tank, thereby making the liquid compound alkali in the storage tank more uniform, and making the pipeline of the dosing system less prone to scaling, reducing the frequency of on-site pipeline maintenance.

[0043] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions and substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A neutralization reaction tank structure, characterized in that, The reaction tank (1) includes a partition plate (2) inside the reaction tank (1), which divides the interior of the reaction tank (1) into a first reaction zone (3) and a second reaction zone (4). A water passage gap is provided between the bottom of the partition plate (2) and the bottom wall of the reaction tank (1), which connects the first reaction zone (3) and the second reaction zone (4). At least one dispersion plate (5) is provided in both the first reaction zone (3) and the second reaction zone (4), and the dispersion plate (5) is set at a certain angle to the bottom wall of the reaction tank (1).

2. The neutralization reaction tank structure according to claim 1, characterized in that, The dispersion plate (5) is located above the water passage gap.

3. The neutralization reaction tank structure according to claim 2, characterized in that, The dispersion plate (5) is disposed on the side wall of the partition plate (2) and / or the inner wall of the reaction tank (1).

4. The neutralization reaction tank structure according to claim 3, characterized in that, The top end of the dispersion plate (5) is the connecting end, and the bottom end of the dispersion plate (5) is the free end.

5. The neutralization reaction tank structure according to claim 4, characterized in that, The obtuse angle formed between the dispersion plate (5) and the bottom wall of the reaction tank (1) is 120°~150°.

6. The neutralization reaction tank structure according to claim 1, characterized in that, The reaction tank (1), the partition plate (2) and the dispersion plate (5) are all made of steel plates.

7. The neutralization reaction tank structure according to claim 1, characterized in that, It also includes a first dosing tube (6) and a second dosing tube (7). The first dosing tube (6) is located at the top of the first reaction zone (3), and the second dosing tube (7) is located at the top of the second reaction zone (4). The inlet ends of the first dosing tube (6) and the second dosing tube (7) are connected to a drug delivery tube (8). The outlet of the first dosing tube (6) faces the dispersion plate (5) in the first reaction zone (3), and the outlet of the second dosing tube (7) faces the dispersion plate (5) in the second reaction zone (4).

8. The neutralization reaction tank structure according to claim 7, characterized in that, Both the first dosing tube (6) and the second dosing tube (7) are equipped with switching valves.

9. A composite alkali dosing system, characterized in that, include: The structure includes a storage tank (9), a first pump (10), a dilution tank (11), a second pump (12), and a neutralization reaction tank as described in any one of claims 1-8, connected sequentially by pipes; a return pipe (13) is also connected to the pipe between the first pump (10) and the dilution tank (11), the other end of the return pipe (13) is connected to the top of the storage tank (9), and a tap water pipe (14) is also connected to the inlet end of the dilution tank (11).

10. The composite alkali dosing system according to claim 9, characterized in that, Two medicine storage tanks (9) are arranged side by side. The outlets of the two medicine storage tanks (9) are connected to the first liquid pump (10) through Y-shaped pipes or T-shaped pipes. The tops of the two medicine storage tanks (9) are connected to the return pipe (13).

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