An antifoaming and defoaming device

Abstract

The present application discloses an anti-foaming and defoaming device, which comprises a device body. Inside the device body, there are successively arranged a first accommodation cavity, a second accommodation cavity and a third accommodation cavity that are interconnected, and the inner diameters of the first accommodation cavity, the second accommodation cavity and the third accommodation cavity gradually increase; an air inlet is provided in the first accommodation cavity, an exhaust port is provided in the third accommodation cavity, an air inlet pipe for inputting gas is installed at the air inlet, and a negative pressure fan for discharging gas is installed at the exhaust port; inside the first accommodation cavity, an anti-foaming cyclone assembly and an anti-foaming spray assembly for eliminating foam in the gas are successively installed along the gas flow direction; an anti-misting baffle assembly for eliminating mist in the gas is installed in the second accommodation cavity; and an anti-misting wire mesh assembly for eliminating mist in the gas is installed in the third accommodation cavity. The technical solution of the present application integrates anti-foaming and defoaming in one device, improving the efficiency of gas-liquid separation.

Description

Technical Field

[0001] This application relates to the technical field of waste gas treatment, and particularly relates to a defoaming and defoaming device. Background Art

[0002] In industrial production, foam is divided into chemical foam and biological foam. Chemical foam is caused by domestic garbage in the garbage storage area containing discarded laundry detergent bags, shampoo bottles, shower gel bottles, etc. after use in daily life, which will cause a large amount of surfactants in the water body; there is a large amount of meat, rice, and vegetables discarded by families and hotels in domestic garbage, and the proteins, glycosides with many free hydroxyl groups, fatty acids, etc. produced by their fermentation will greatly reduce the surface tension of water. When combined with surfactants, it is easier to form foam that is not easy to break.

[0003] When treating wastewater by the biochemical method, when the sludge load increases, the temperature decreases, the pH value decreases, and the dissolved oxygen level drops, the growth of filamentous bacteria will be caused. When filamentous bacteria are the dominant strains, a large amount of foam will appear; most of these microorganisms are filamentous or branched, easy to form a network, can trap microparticles and bubbles, and the filamentous microorganisms contain lipid substances, with a specific gravity lighter than water and easy to float to the water surface. The bubbles surrounded by the filamentous network increase their surface tension, thus forming small-shaped, light-quality, and hydrophobic biological foam. This biological foam has the characteristics of high viscosity, strong stability, and difficulty in breaking. Due to the existence of the filamentous network on the bubble surface, it is difficult for the bubble itself to contact the defoamer, which limits the defoaming means.

[0004] In the treatment of landfill leachate and refinery wastewater, due to the complex composition of the wastewater, containing various organic substances including surfactants, a large amount of dense and stable foam inevitably appears during the treatment of this kind of wastewater. This kind of foam will block the equipment exhaust, have a huge impact on the waste gas treatment process, cause production to be blocked, and this kind of foam also carries small solid particles, which will cause serious pipeline scaling during long-term operation and affect production;

[0005] Conventional defoaming devices (mechanical stirring, ultrasonic, thermal, etc.) have low defoaming efficiency and high energy consumption. The defoamer has high defoaming efficiency, but it is difficult to defoam when there are fixed particles attached to the surface or other substances that can isolate the defoamer, and these conventional defoaming devices do not have the function of defoaming, which is not friendly to the subsequent tail gas treatment; traditional demisters (wire mesh, corrugated plate, rotary vane) have extremely low demisting efficiency and large pressure drop when encountering foam, and the demisting wire mesh will even be blocked by particulate impurities in the foam, requiring frequent maintenance. Summary of the Invention

[0006] This application proposes a defoaming and defoaming device, which integrates defoaming and defoaming in one device to improve the efficiency of gas-liquid separation.

[0007] An embodiment of the present application provides a defoaming and demisting device, which includes a device body. Inside the device body, there are successively arranged a first accommodation cavity, a second accommodation cavity, and a third accommodation cavity that are interconnected, and the inner diameters of the first accommodation cavity, the second accommodation cavity, and the third accommodation cavity gradually increase;

[0008] The first accommodation cavity is provided with an air inlet, the third accommodation cavity is provided with an exhaust port, an air inlet pipe for inputting gas is installed at the air inlet, and a negative pressure fan for discharging gas is installed at the exhaust port;

[0009] Inside the first accommodation cavity, a defoaming swirl assembly and a defoaming spray assembly for eliminating foam in the gas are successively installed along the gas flow direction; inside the second accommodation cavity, a demisting baffle assembly for eliminating mist in the gas is installed; inside the third accommodation cavity, a demisting wire mesh assembly for eliminating mist in the gas is installed.

[0010] In some embodiments, the inner diameter of the second accommodation cavity is 3 to 8 times the inner diameter of the first accommodation cavity, and the inner diameter of the third accommodation cavity is 4 to 10 times the inner diameter of the first accommodation cavity.

[0011] In some embodiments, the defoaming swirl assembly includes a plurality of swirl tubes arranged in parallel, and a first spiral flow channel for gas to flow through is provided inside the swirl tubes.

[0012] In some embodiments, a first guide post is coaxially arranged inside the swirl tube, and a plurality of first swirl vanes are successively installed along the length direction of the first guide post. A first spiral flow channel for gas to flow through is formed between the plurality of first swirl vanes.

[0013] In some embodiments, the defoaming spray assembly includes at least one spray pipe for outputting spray liquid, and a plurality of spray heads for spraying the spray liquid are installed on the spray pipe.

[0014] In some embodiments, the demisting baffle assembly includes a plurality of demisting baffles arranged in parallel. The gap between two adjacent demisting baffles forms a flow channel for gas to flow through, and the flow channel is arranged in a curved shape.

[0015] In some embodiments, any one of the demisting baffles is arranged in an S shape along the gas flow direction, the interval between two adjacent demisting baffles is set to 150 - 250 mm, and the included angle between the inclined surface of the demisting baffle and the vertical plane is set to 30 - 45°.

[0016] In some embodiments, an Λ-shaped convex pattern is further provided on the surface of any one of the demisting baffles.

[0017] In some embodiments, a second spiral flow channel for gas to flow through is provided inside the air inlet pipe.

[0018] In some embodiments, a second guiding column is coaxially arranged inside the air inlet pipe, and a plurality of second swirling vanes are sequentially installed along the length direction of the second guiding column. A second spiral flow channel for gas to flow through is formed between the plurality of second swirling vanes.

[0019] Compared with the prior art, the beneficial effects of the present application are as follows: In this embodiment, defoaming and demisting are combined. The spiral gas flow channel process is combined with spraying to break the foam in the waste gas containing foam and release the gas in the foam to achieve gas-liquid separation, avoiding affecting subsequent demisting. Moreover, the overall structure is reasonably designed to maximize the operating efficiency of the device. At the same time, there is a negative pressure device to keep the cavity in a certain negative pressure state, which is beneficial to the breaking of foam and eliminating the influence of pressure drop. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the defoaming and demisting device of the present application;

[0022] Figure 2 It is a schematic diagram of the overall structure of the defoaming swirling component of the present application;

[0023] Figure 3 It is a schematic diagram of the top view structure of the defoaming swirling component of the present application;

[0024] Figure 4 It is a schematic diagram of the bottom view structure of the defoaming swirling component of the present application;

[0025] Figure 5 It is a schematic diagram of the structure of the swirling tube of the present application;

[0026] Figure 6 It is a schematic diagram of the top view structure of the defoaming spraying component of the present application;

[0027] Figure 7 It is a schematic diagram of the front view and side view structures of the demisting baffle component of the present application;

[0028] Figure 8 It is a schematic diagram of the top view structure of the demisting baffle component of the present application;

[0029] Figure 9 It is a schematic diagram of the internal structure of the air inlet pipe of the present application;

[0030] The realization of the purpose, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the drawings. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0032] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application.

[0033] An antifoaming and defoaming device proposed in this embodiment is referred to Figure 1 , and includes a device body 1. A first accommodation cavity 11, a second accommodation cavity 12, and a third accommodation cavity 13 that are sequentially communicated with each other are provided inside the device body 1, and the inner diameters of the first accommodation cavity 11, the second accommodation cavity 12, and the third accommodation cavity 13 gradually increase;

[0034] An air inlet 14 is provided in the first accommodation cavity 11, an exhaust port is provided in the third accommodation cavity 13, an air inlet pipe 2 for inputting gas is installed at the air inlet 14, and a negative pressure fan 3 for discharging gas is installed at the exhaust port;

[0035] An antifoaming swirl assembly 4 and an antifoaming spray assembly 5 for eliminating foam in the gas are sequentially installed in the first accommodation cavity 11 along the gas flow direction; a demisting baffle assembly 6 for eliminating mist in the gas is installed in the second accommodation cavity 12; a demisting wire mesh assembly 7 for eliminating mist in the gas is installed in the third accommodation cavity 13.

[0036] It should be noted that when the waste gas entraining foam enters the device body 1 through the air inlet pipe 2, it sequentially passes through the first accommodation cavity 11, the second accommodation cavity 12, and the third accommodation cavity 13; due to the extremely high efficiency of the antifoaming swirl assembly 4 and the antifoaming spray assembly 5 in removing bubbles, the residence time of the waste gas is short and the gas flow rate is large. Therefore, the inner diameter of the first accommodation cavity 11 is the smallest; the demisting baffle assembly 6 has a low demisting efficiency and places a limit on the flow velocity (generally 2-5 m / s, and the best is 3-4 m / s) to increase the residence time. Therefore, the inner diameter of the second accommodation cavity 12 is larger; when the waste gas passes through the demisting wire mesh assembly 7, the mist content in the waste gas is low, so its demisting efficiency is very low, and the flow velocity is smaller than that of the demisting baffle assembly 6 (generally 2-4 m / s, and the best is 3 m / s). Therefore, the inner diameter of the third accommodation cavity 13 is the largest. Specifically, in this embodiment, the inner diameter of the second accommodation cavity 12 is 3-8 times the inner diameter of the first accommodation cavity 11, and the inner diameter of the third accommodation cavity 13 is 4-10 times the inner diameter of the first accommodation cavity 11.

[0037] Further, the negative pressure fan 3 in this embodiment can generate a vacuum degree of -10 kPa to -40 kPa. The specific vacuum degree can be selected and adjusted according to the foam density, the ease of fragmentation, and the gas pressure loss in actual operation. By means of the negative pressure fan, the foam can be made unstable, and the pressure drop generated when the gas passes through the component can be slowed down.

[0038] Further, a liquid collection cavity 16 for collecting the liquid separated from gas-liquid is also provided at the bottom of the first accommodation cavity 11. For the convenience of liquid collection, the liquid collection cavity 16 can be set as a conical inverted hopper structure, and a liquid discharge port 17 for discharging the liquid can be opened at its bottom. When the collected liquid reaches a certain amount, it is discharged from the liquid discharge port 17.

[0039] Further, referring to Figure 2 , the defoaming cyclone assembly 4 includes a plurality of cyclone tubes 41 arranged in parallel, and a first spiral flow channel for the gas to flow through is provided inside the cyclone tube 41. By providing a spiral flow channel for the gas, the cyclone tube 41 can generate a cyclone centrifugal force on the gas, which is convenient for the foam in the waste gas to be broken.

[0040] Specifically, referring to Figures 3 to 5 , in this embodiment, a first guiding column 42 is coaxially arranged inside the cyclone tube 41, and a plurality of first cyclone vanes 43 are sequentially installed on the first guiding column 42 along its length direction. A first spiral flow channel for the gas to flow through is formed between the plurality of first cyclone vanes 43. At the same time, the outlet of the cyclone tube 41 for discharging the gas is set as a horn shape, which is convenient for the diffusion of the gas.

[0041] Further, referring to Figure 6 , the defoaming spray assembly 5 includes at least one spray pipe 51 for outputting the spray liquid, and a plurality of spray heads 52 for spraying the spray liquid are installed on the spray pipe 51. The spray liquid is sprayed through the spray heads to break the foam. In this embodiment, the spray pipe 51 can be made of 316L or 304 material, and the spray head 52 can adopt a movable and rotatable structure. Specifically, the spray head 52 and the spray pipe 51 can be rotatably hinged, and the power for the rotation of the spray head 52 can be provided by the power of the flowing spray liquid.

[0042] Further, referring to Figure 7 , the demisting baffle assembly 6 includes a plurality of demisting baffles 61 arranged in parallel, and the gap between two adjacent demisting baffles 61 forms a flow channel for the gas to flow through, and the flow channel is arranged in a curved shape. By improving the structure of the demisting baffle 61 and setting the flow channel for the gas to flow through between the demisting baffles 61 as a curved flow channel, the length of the flow channel can be increased, the residence time of the gas can be increased, and the demisting effect can be improved.

[0043] Specifically, in this embodiment, any one of the demisting baffle plates 61 is arranged in an S shape along the gas flow direction. The interval between adjacent demisting baffle plates 61 is set to be 150 - 250 mm, preferably 200 mm. The thickness of the demisting baffle plate 61 can be set to 3 mm. The angle between the inclined surface and the vertical surface of the demisting baffle plate 61 is set to 30 - 45°, which can reduce the resistance of gas passing while ensuring the demisting effect.

[0044] Furthermore, an Λ-shaped convex pattern 62 is provided on the surface of any one of the demisting baffle plates 61, which can increase the contact area between the surface of the demisting baffle plate 61 and the waste gas, making the demisting effect better.

[0045] Furthermore, referring to Figure 9 , a second spiral flow channel for the gas to flow through is provided inside the intake pipe 2. The intake pipe 2 can provide a spiral flow channel for the gas, which can generate a swirling centrifugal force on the gas, facilitating the first preliminary defoaming of the input gas and filtering out impurities in the gas, etc., facilitating subsequent defoaming and demisting.

[0046] Specifically, in this embodiment, a second guiding column 21 is coaxially arranged inside the intake pipe 2, and a plurality of second swirling vanes 22 are sequentially installed along the length direction of the second guiding column 21. A second spiral flow channel for the gas to flow through is formed between the plurality of second swirling vanes 22.

[0047] The working process of this defoaming and demisting device is further described as follows:

[0048] The waste gas containing foam enters the intake pipe 2 from the air inlet 14. Since a second spiral flow channel is provided inside the intake pipe 2, the waste gas containing foam is subjected to swirling separation for preliminary defoaming. At the same time, the air outlet 15 of the intake pipe 2 in this embodiment is arranged in a flared shape, and the waste gas diffuses into the defoaming swirling assembly 4 through the flared outlet of the intake pipe 2;

[0049] The defoaming swirling assembly 4 is mainly composed of swirling tubes 41 and is uniformly arranged. The upper and lower parts of the swirling tubes 41 are fixed by an upper support plate 44 and a lower support plate 45; the waste gas enters the swirling tubes 41. After being guided by the first spiral flow channel formed by the first swirling vanes 43 inside the swirling tubes 41, a swirling centrifugal force is generated, and the waste gas with entrained foam generates swirling and spirally rises along the inner wall of the swirling tubes 41. Due to the strong centrifugal force, the foam is separated from the gas-liquid mixture. The gas diffuses out along the flared outlet of the swirling tubes 41, and the liquid droplets flow down along the inner wall of the swirling tubes 41 into the liquid collection cavity 16 and are discharged from the liquid discharge port 17;

[0050] The exhaust gas defoamed by the defoaming cyclone assembly 4 is defoamed again by the defoaming spray assembly 5. The defoaming spray assembly 5 consists of a spray pipe 51 and spray heads 52 uniformly arranged along the spray pipe 51. In this embodiment, the spray heads 52 form rotation by the impact force of water flow, which can achieve more uniform water distribution. Under normal circumstances, the defoaming spray assembly 5 only needs to spray clean water to further defoam the unbroken foam and clean the cyclone pipe 41. If the amount of surfactant in the foam is large, defoamer can be appropriately added to the spray liquid to play a synergistic role with the defoaming cyclone assembly 4. The water sprayed down enters the cyclone pipe 41 along the flared outlet of the cyclone pipe 41, flows into the liquid collection cavity 16 along the inner wall of the cyclone pipe 41, and is discharged from the liquid discharge port 17. The variable-frequency negative pressure fan 3 located at the top can keep the interior of the device body 1 in a negative pressure state (-10 kPa to -40 kPa), making the pressure difference inside and outside the bubble liquid film unstable, which is more conducive to the breaking of foam. At the same time, it can eliminate the pressure loss caused by the internal defoaming and defoaming process.

[0051] After passing through the two-stage defoaming mechanism, the exhaust gas no longer carries foam, but it carries a large amount of mist. The gas treated by the defoaming spray assembly 5 then passes upward through the demisting baffle assembly 6 for demisting treatment.

[0052] In this embodiment, several demisting baffles 61 are installed on the fixing strip 63 through snap fasteners 64. The demisting baffles 61 adopt an "S" shape. When the gas passes through, it will pass along the surface of the demisting baffles 61, increasing the residence time. The angle of the entire flow channel changes sharply with a smaller angle, the overall flow channel is longer and the pressure drop is smaller. Moreover, the Λ-shaped convex patterns 62 on the surface of the demisting baffles 61 increase the relative contact area, making the effect of condensing and demisting mist better. After separation by the demisting baffle assembly 6, 99% of the mist with a diameter of ≥30 μm can be removed.

[0053] The gas treated by the demisting baffle assembly 6 then passes upward through the demisting wire mesh assembly 7 for final demisting treatment. In this embodiment, the demisting wire mesh assembly 7 adopts an existing demisting wire mesh device. When the gas with mist rises through the wire mesh at a certain speed, due to the inertial effect of the rising mist, the mist collides with the fine wires of the wire mesh and adheres to the surface of the fine wires. The diffusion of the mist on the surface of the fine wires and the gravitational settlement of the mist cause the mist to form larger liquid droplets that flow along the fine wires to the intersection of two wires. The wettability of the fine wires, the surface tension of the liquid, and the capillary action of the fine wires make the liquid droplets larger and larger. Finally, due to the influence of gravity, the liquid droplets flow from the guiding fine steel wires to the inner wall of the device body 1 to achieve gas-liquid separation. After the gas passes through the demisting wire mesh assembly 7, the mist particle size is ≤5 μm, and the exhaust gas finally passes through the negative pressure fan 3 and is discharged through the exhaust port.

[0054] The above are only the preferred embodiments of the present application, which do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. An antifoaming and defoaming device, characterized in that, It includes a device body, inside which there are successively arranged a first accommodation chamber, a second accommodation chamber and a third accommodation chamber that are interconnected, and the inner diameters of the first accommodation chamber, the second accommodation chamber and the third accommodation chamber gradually increase; The first accommodation chamber is provided with an air inlet, the third accommodation chamber is provided with an exhaust port, an air inlet pipe for inputting gas is installed at the air inlet, and a negative pressure fan for discharging gas is installed at the exhaust port; Inside the first accommodation chamber, a defoaming cyclone assembly and a defoaming spray assembly for eliminating foam in the gas are successively installed along the gas flow direction; inside the second accommodation chamber, a demisting baffle assembly for eliminating mist in the gas is installed; inside the third accommodation chamber, a demisting wire mesh assembly for eliminating mist in the gas is installed; The defoaming cyclone assembly includes a plurality of cyclone tubes arranged in parallel, and a first spiral flow channel for gas to flow through is arranged inside the cyclone tubes; A first guide post is coaxially arranged inside the cyclone tube, and a plurality of first swirl vanes are successively installed along the length direction of the first guide post. A first spiral flow channel for gas to flow through is formed between the plurality of first swirl vanes; The demisting baffle assembly includes a plurality of demisting baffles arranged in parallel. The gap between two adjacent demisting baffles forms a flow channel for gas to flow through, and the flow channel is curved.

2. The defoaming and de-foaming device according to claim 1, wherein The inner diameter of the second accommodation chamber is 3 to 8 times that of the first accommodation chamber, and the inner diameter of the third accommodation chamber is 4 to 10 times that of the first accommodation chamber.

3. The defoaming and foam removing device according to claim 1, characterized in that, The defoaming spray assembly includes at least one spray pipe for outputting spray liquid, and a plurality of spray heads for spraying the spray liquid are installed on the spray pipe.

4. The defoaming and foam-removing device according to claim 1, wherein The demisting baffle is arranged in an S shape along the gas flow direction, the interval between two adjacent demisting baffles is set to be 150 to 250 mm, and the included angle between the inclined surface of the demisting baffle and the vertical surface is set to be 30 to 45°.

5. The defoaming and de-foaming device according to claim 1, characterized in that The surface of the demisting baffle is also provided with Λ-shaped convex stripes.

6. The defoaming and de-foaming device according to any one of claims 1 to 5, characterized in that A second spiral flow channel for gas to flow through is arranged inside the air inlet pipe.

7. The defoaming and foam-removing device according to claim 6, characterized in that, A second guide post is coaxially arranged inside the air inlet pipe, and a plurality of second swirl vanes are successively installed along the length direction of the second guide post. A second spiral flow channel for gas to flow through is formed between the plurality of second swirl vanes.

Images