Intermittent bubble release coalescence device and digestion reactor
By designing intermittently releasing air bubbles in the anaerobic and digestive reactor, the oblique board is collected and agglomerated by the foam in the form of an air bubble, which produces local turbulence. The digestive response rate and texture effect.
Patent Information
- Application Number
- CN202421043495.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-14
AI Technical Summary
Due to the large body volume of the reactor in the anaerobic digestion reactor, the feed distribution is uneven, the process processing efficiency is low, and the digestion residence time is long. The turbulence generated by the agitator is caused by the high viscosity properties of the sludge or slurry. It cannot act into the entire reactor, resulting in uneven mixing.
Design an intermittently release of bubble agglomeration, including the bubble concentration and component and rotating mechanism set in the reactor. Collect small bubbles in the reactor through the oblique board. Local turbulence and improve the mixed effect.
The kinetic energy of atmospheric bubbles is transformed into hybrid energy, improving the quality transmission process in the reactor, increasing the digestive reaction rate, reducing the mixed energy required for digestive reactions, and suitable for low and middle -class gas -based aversion digestive reactor.
Smart Images
Figure CN222411567U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of digestion treatment, in particular to a coalescence device for intermittently releasing bubbles and a digestion reactor. Background Art
[0002] Anaerobic biological treatment methods can convert organic matter into biogas and are widely used in the fields of wastewater, sludge and biomass treatment. Biological anaerobic processes are usually carried out in large digestion tanks and require good mixing to achieve efficient reactions. In actual production, it is difficult to achieve good mixing due to the high solid content in the reactor. The substrate and nutrients added to the reactor are difficult to be quickly transferred and distributed throughout the reactor volume.
[0003] At present, the mixing of traditional anaerobic digesters is usually achieved by external circulation flow combined with mechanical mixing or external gas injection. The external circulation flow of the anaerobic digestion reactor is achieved by extracting the mixture in the reactor and injecting it back into the reactor at different heights or positions of the reactor. The mechanical mixing method of the anaerobic reactor can be achieved by a mechanical mixer. For the mixing method of gas injection, part of the generated biogas is collected and compressed and then re-injected into the reactor from the low point at the bottom of the reactor. A diversion channel is usually set in the reactor to promote the circulation flow inside the reactor.
[0004] In general, all of the above mixing methods are aimed at generating the largest possible internal circulation, thereby generating convective mass transfer so that the newly added substrate and nutrients in the reactor are quickly dispersed throughout the reactor volume. However, due to the large volume of the reactor itself, problems such as uneven feed distribution, low process efficiency, and long digestion residence time have further led to increased investment and operating costs. In addition, due to the high viscosity of the sludge or slurry, the turbulence generated by the agitator cannot act on the entire reactor, resulting in uneven distribution of the externally introduced stirring power in the reactor, resulting in high turbulence areas around the mixing point, while some areas have little or no convective mass transfer, and there are dead zones.
[0005] In fact, the biogas produced by anaerobic digestion is usually distributed throughout the reactor in the form of small, growable bubbles. The expansion of bubble size and the buoyancy generated by the bubbles provide a potential source of energy for mixing. However, since the average size of the bubbles is very small, usually below 2 mm, the bubble size is smaller than the minimum turbulent diameter (Kolmogorov diameter, also called Kolmogorov microscale) required to induce turbulence, that is, smaller than the eddy size required to produce convective mass transfer, therefore, the kinetic energy released in the biogas production process cannot be converted into mixing energy. Utility Model Content
[0006] In response to the above technical problems, the utility model discloses an intermittently releasing bubble aggregation device and a digestion reactor. The intermittently releasing bubble aggregation device can collect and condense small bubbles attached to flocs and particulate matter, and after aggregation, release them intermittently in the reactor in the form of large bubbles, generating local turbulence, thereby improving the mixing effect and promoting the mass transfer process.
[0007] To this end, the technical solution of the utility model is:
[0008] A bubble-gathering device for intermittently releasing bubbles, comprising at least one bubble-gathering component arranged in a reactor, wherein the bubble-gathering component is connected to a rotating mechanism, and the rotating mechanism drives the bubble-gathering component to flip laterally in the reactor;
[0009] The bubble gathering component comprises an inclined plate, at least one gas collecting chamber is arranged on the top of the inclined plate, a gas release port is arranged on the top of the gas collecting chamber, the gas collecting chamber is open downward, and the opening faces the side of the inclined plate.
[0010] The inclined plate is tilted in the reactor in an initial state, that is, there is an angle between the inclined plate and the axis of the reactor.
[0011] With this technical solution, the inclined surface is used as a solid surface. In the reactor, bubbles attached to the surface of flocs or particles can be collected and aggregated at the solid-gas interface (the interface between the collected bubbles and the contacting bubbles). When the gas collecting chamber is filled with gas, the inclined plate can be flipped from one side to the other through the rotating mechanism. During the flipping process, the height of the gas release port will be raised, so that the gas under the gas collecting chamber is released in the form of large bubbles. The size of the released bubbles increases, which increases the velocity gradient between the bubbles and the liquid. The kinetic energy of the large bubbles forms local turbulence, which enhances the convective mass transfer in the reactor, thereby converting the fine bubbles generated by the anaerobic digestion process into usable mixing energy.
[0012] The above device is suitable for being arranged in an anaerobic digestion reactor with low or medium gas production rate, and overcomes the disadvantage of low gas production rate of the reactor by arranging high-density gas release points, thereby achieving better mass transfer effect.
[0013] Moreover, this technical solution adopts the method of horizontally flipping the inclined plate, which requires a short tilting stroke. In addition, the gas filled under the gas collecting chamber can generate a certain buoyancy, so that driving the inclined plate to flip does not require a lot of energy consumption. The intermittent flipping of the inclined plate can also produce a self-cleaning effect, so that the scum accumulated around the inclined plate is released. In addition, in the process of flipping the inclined plate, large bubbles are released from the gas release port at the edge of the gas collecting chamber as the inclined plate flips, forming a large bubble release belt along the way, thereby avoiding the formation of gas blockage under the gas collecting chamber. At the same time, the released large bubbles are conducive to improving the mixing effect in the reactor.
[0014] As a further improvement of the present invention, there are two gas collecting chambers, which are symmetrically arranged on both sides of the top of the inclined plate, and the openings of the gas collecting chambers are respectively facing the two side surfaces of the inclined plate; adopting this technical solution, each side surface of the inclined surface corresponds to a gas collecting chamber, which improves the bubble collection efficiency.
[0015] As a further improvement of the utility model, the surface of the inclined plate is made of a hydrophobic material. When bubbles encounter a hydrophobic solid surface, since the contact angle between the bubbles and the solid or liquid is smaller than the contact angle between the flocculent mud or granular mud to which they are attached, the bubbles are more easily desorbed from the biological mud and transferred to the inclined plate. Subsequently, the desorbed bubbles gather together and move along the inclined plate into the gas collecting chamber. The desorbed small bubbles and the gathered bubbles are introduced to the gas release port through the gas collecting chamber and released in the reactor in the form of large bubbles.
[0016] As a further improvement of the utility model, the top of the gas collecting chamber includes a first top and a second top, one side of the first top is connected to the inclined plate, the other side opposite to the first top is connected to the second top, the first top, the second top and the inclined plate form a gas collecting chamber, and the gas release port is located at the second top. Further, the gas release port is located at the side of the second top.
[0017] Further preferably, the highest point of the plenum chamber is located at the connection between the first top and the second top.
[0018] Further preferably, the second top portion is a plane and is located at the edge of the first top portion.
[0019] Further preferably, the angle between the second top and the extension line of the inclined plate is 75° to 120°. With this technical solution, the gas collecting chamber has a certain volume and ensures that the gas is completely released.
[0020] As a further improvement of the utility model, the notch of the gas release port is square or semicircular, and its side length or diameter is not less than 10 mm.
[0021] As a further improvement of the present invention, at least one partition is provided in the air collecting chamber for dividing the indoor space.
[0022] As a further improvement of the utility model, the rotating mechanism includes a thrust rod and a fixed support beam, the thrust rod and the fixed support beam are rotatably connected to the inclined plate, the fixed support beam is fixed, the thrust rod is pushed, and the inclined plate is driven to rotate. With this technical solution, the turning force of the inclined plate comes from the thrust rod connected to the inclined plate, and the driving mode of the thrust rod is not limited, and electric drive, gas drive, liquid drive, or manual drive can be selected. The technical solution has a simple structure, is easy to implement, and has low cost.
[0023] As a further improvement of the utility model, the lower part or bottom of the inclined plate is rotatably connected to the thrust rod, and the fixed support beam is rotatably connected to the middle part of the inclined plate. Further, the thrust rod and the fixed support beam are respectively connected to the inclined plate through a fulcrum bearing. Further, the thrust rod and the fixed support beam are arranged in parallel up and down.
[0024] As a further improvement of the present invention, a plurality of bubble gathering components are arranged in parallel in at least two rows along the horizontal direction, and the ratio of the horizontal spacing b between two adjacent rows of bubble gathering components and the horizontal projection width B of the bubble gathering components satisfies b / B=0.8~0.95; the thrust rod and the fixed support beam are connected to each row of bubble gathering components.
[0025] As a further improvement of the utility model, the gas release ports are evenly distributed on the horizontal cross section in the reactor. The horizontal cross section here can be understood as a horizontal projection plane. With this technical solution, the mixing mass transfer effect in the reactor is better.
[0026] As a further improvement of the utility model, the rotating mechanism includes a driving mechanism, and the driving mechanism is connected to the thrust rod. With this technical solution, the driving mechanism pushes the thrust rod to move, thereby driving the inclined plate to rotate.
[0027] The utility model also discloses a digestion reactor, which comprises a reactor body. A flow guide channel is arranged in the reactor body. The upper part of the flow guide channel is provided with a gathering device for intermittently releasing bubbles as described in any one of the above items.
[0028] As a further improvement of the utility model, a gap is provided between the reactor body and the flow guide channel. With this technical solution, the collected gas is released in the form of large bubbles at the gas release port, and the medium returns to the bottom of the reactor through the gap, resulting in a better mixed mass transfer effect in the reactor.
[0029] As a further improvement of the utility model, the diversion channel is rectangular or square. This technical solution can facilitate the installation of the merging device.
[0030] Compared with the prior art, the beneficial effects of the utility model are:
[0031] First, the technical solution of the utility model is adopted to collect small bubbles adsorbed on flocs or particles in the reactor through the inclined plate, and the desorbed small bubbles gather together and move into the gas collecting chamber along the inclined plate; through the rotating mechanism, the inclined plate can be intermittently flipped, so that the gas accumulated below the gas collecting chamber is released in the form of large bubbles through the gas release port, so that its kinetic energy is converted into mixing energy, which can greatly improve the mass transfer process in the reactor, thereby increasing the digestion reaction rate and reducing the additional mixing energy required for the digestion reaction. For anaerobic digestion reactors with low and medium gas production rates, high-density gas release points can be effectively arranged as needed.
[0032] Second, the technical solution of the utility model adopts a transversely flipping inclined plate, which requires a short tilting stroke, and the gas filled in the gas collecting chamber can generate a certain buoyancy, so that driving the inclined plate to flip does not require a lot of energy consumption. In addition, the intermittent flipping of the inclined plate can also produce a self-cleaning effect on the inclined plate itself, and the scum gathered around the inclined plate is also released simultaneously with the release of bubbles during the flipping process of the inclined plate.
[0033] Third, by adopting the technical solution of the utility model, during the process of flipping the inclined plate, large bubbles are released from the gas release port as the inclined plate flips, forming a large bubble release zone along the way, thereby avoiding gas blockage below the gas collecting chamber. At the same time, the released large bubbles are conducive to improving the mixing effect in the reactor. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] Figure 1 It is a schematic structural diagram of the intermittent bubble releasing aggregation device in the reactor of Example 1 of the utility model.
[0035] Figure 2 It is a schematic structural diagram of the intermittent bubble releasing agglomeration device of Example 1 of the utility model.
[0036] Figure 3 It is a schematic structural diagram of the intermittent bubble releasing agglomeration device of Example 2 of the utility model.
[0037] Figure 4 It is a schematic diagram of the flipping process of the intermittent bubble releasing agglomeration device of Example 2 of the utility model.
[0038] Reference numerals include:
[0039] 1-reactor, 2-guiding channel, 3-coalescing device, 4-medium, 5-gap, 6-rotating mechanism;
[0040] 10-bubble gathering component, 11-gas collecting chamber, 12-inclined plate, 13-gas collecting area, 14-gas release port, 15-small bubbles, 16-large bubbles, 17-flocs or particles; 18-first top, 19-second top;
[0041] 61 - fixed support beam, 62 - thrust rod, 63 - first fulcrum bearing, 64 - second fulcrum bearing. DETAILED DESCRIPTION
[0042] The preferred embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0043] Example 1
[0044] like Figure 1 and Figure 2 As shown, a bubble-gathering device for intermittently releasing bubbles comprises a plurality of bubble-gathering components 10 arranged in a flow guide channel 2 of a reactor 1, wherein the bubble-gathering components 10 are connected to a rotating mechanism 6, and the rotating mechanism 6 drives the bubble-gathering components 10 to flip laterally in the reactor 1.
[0045] The bubble gathering member 10 includes an inclined plate 12, two gas collecting chambers 11 are symmetrically arranged on the top of the inclined plate 12, a gas collecting area 13 is arranged below the gas collecting chamber 11, a gas release port 14 is arranged on the top outer edge of the gas collecting chamber 11, the gas collecting area 13 is connected to the gas release port 14, and the two gas collecting areas 13 are respectively facing two sides of the inclined plate 12. The surface of the inclined plate 12 is made of a hydrophobic material.
[0046] In this embodiment, the top surface of the gas collecting chamber 11 includes a first top 18 and a second top 19. The first top 18 is the connecting portion between the gas collecting chamber 11 and the inclined plate 12. The second top 19 is the flat plate portion from the highest point of the gas collecting chamber 11 to the outer edge of the gas collecting chamber. The angle between the second top 19 and the extended line of the inclined plate 12 is between 75° and 120°, preferably 90°.
[0047] The shape of the gas release port 14 is square or semicircular, and the side length thereof is not less than 10 mm. Further, the gas release port 14 is a notch arranged at the edge of the second top portion 19 .
[0048] The rotating mechanism 6 includes a thrust rod 62 and a fixed support beam 61, and the thrust rod 62 and the fixed support beam 61 are respectively connected to the inclined plate 12 for rotation. The fixed support beam 61 is fixed to push the thrust rod 62, thereby driving the inclined plate 12 to rotate. The turning force of the inclined plate 12 comes from the thrust rod 62 connected to the inclined plate 12. The driving mode of the thrust rod 62 is not limited, and can be electric drive, gas drive, liquid drive, or manual drive.
[0049] Furthermore, the gas release ports 14 on each gas collecting chamber 11 are evenly distributed on a horizontal cross section in the reactor 1 .
[0050] In the initial state, the inclined plate 12 is tiltedly arranged in the guide channel 2, that is, there is an angle between the inclined plate 12 and the axial center line direction of the guide channel 2, and the angle can be 15-40 degrees.
[0051] With the technical solution of this embodiment, the flocs or particles 17 attached with small bubbles 15 flow upward in the guide channel 2 until the small bubbles 15 hit the air cushion formed in the inclined plate 12 or the gas collection area 13, and then the small bubbles 15 are desorbed from the flocs or particles 17, transferred to the surface of the inclined plate 12, and form an air film. The collected gas eventually fills the gas collection area 13.
[0052] When the gas collecting area 13 is not filled with gas, the inclined plate 12 maintains the initial inclined state. When the gas collecting area 13 is filled with gas, the inclined plate 12 is flipped from one side to the mirror image position of the other side with the same tilt angle by the external driving force. The flipping process raises the gas release point 14 so that the gas in the original gas collecting area 13 is released in the form of large bubbles 16, while the other side continues to collect and aggregate small bubbles 15.
[0053] Furthermore, the flipping frequency of the inclined plate 12 mainly depends on the actual gas production condition of the anaerobic digestion reactor 1, and it is recommended to be no less than 6 times / day.
[0054] Example 2
[0055] like Figure 3 and Figure 4 As shown, based on Example 1, in this embodiment, the thrust rod 62 and the fixed support beam 61 are connected to the inclined plate 12 through the first fulcrum bearing 63 and the second fulcrum bearing 64 respectively, so that the inclined plate 12 can perform a flipping motion around the first fulcrum bearing 63 and the second fulcrum bearing 64.
[0056] Furthermore, the bottom of the inclined plate 12 is rotatably connected to the thrust rod 62, and the fixed support beam 61 is connected to the middle of the inclined plate 12. The thrust rod 62 and the fixed support beam 61 are arranged in parallel up and down.
[0057] The plurality of bubble-gathering members 10 are arranged in at least two rows in parallel in the horizontal direction, and the ratio of the horizontal spacing b between the inclined plates 12 of two adjacent rows of bubble-gathering members 10 and the horizontal projection width B of the bubble-gathering members 10 satisfies b / B=0.8-0.95. The thrust rod 62 is connected to the bottom of the inclined plates 12 of each row of bubble-gathering members 10, and the fixed support beam 61 is connected to the middle of the inclined plates 12 of each row of bubble-gathering members 10.
[0058] The gas release ports 14 on each bubble aggregation component 10 are evenly distributed on the horizontal cross section of the flow guiding channel 2. The horizontal cross section of the flow guiding channel 2 here can be understood as a horizontal projection plane. With this technical solution, the mixing mass transfer effect in the reactor 1 is better.
[0059] When the gas collecting area 13 is not full of gas, the inclined plate 12 remains in the initial inclined position A. When the gas collecting area 13 is full of gas, the thrust rod 62 is pushed to make the inclined plate 12 tilt to the other side, thereby raising the gas release port 14 to its highest position, that is, the position B where the inclined plate 12 is in a vertical state. During this period, the gas in the gas collecting area 13 is released in the form of large bubbles 16 at the gas release port 14. Then, the thrust rod 62 is continued to be pushed to make the inclined plate 12 tilt to the other side until it reaches the mirror position C on the other side with the same inclination angle relative to the initial position A. At this time, bubbles are collected and coalesced in the gas collecting area 13 under the gas collecting chamber 11 on the other side corresponding to the mirror position C until the gas collecting area 13 is full of gas, and then the reverse operation is performed.
[0060] Example 3
[0061] like Figure 1 As shown, a digestion reactor includes a reactor 1, wherein a flow guide channel 2 is provided in the reactor 1, and a coalescing device 3 is provided in the upper part of the flow guide channel 2. The coalescing device 3 adopts the coalescing device for intermittently releasing bubbles as described in the above embodiment 1 or embodiment 2. A gap 5 is provided between the reactor 1 and the flow guide channel 2. With this technical solution, the collected gas is released in the form of large bubbles 16 at the gas release port 14 by intermittently flipping the bubble coalescing device 3, and the medium 4 returns to the bottom of the reactor 1 through the gap 5, so that the mixing and mass transfer effect in the reactor 1 is better.
[0062] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0064] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0065] The specific implementation methods described above are preferred implementation methods of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the shape and structure of the present utility model are within the protection scope of the present utility model.
Claims
1. A gas bubble coalescing device for intermittently releasing gas bubbles, characterized in that: It comprises at least one bubble gathering component, wherein the bubble gathering component is connected to a rotating mechanism, and the rotating mechanism drives the bubble gathering component to turn over laterally in the reactor; The bubble gathering component comprises an inclined plate, at least one gas collecting chamber is arranged on the top of the inclined plate, a gas release port is arranged on the top of the gas collecting chamber, the gas collecting chamber is open downward, and the opening faces the side of the inclined plate.
2. The intermittently released bubble coalescing device according to claim 1, characterized in that: There are two gas collecting chambers, which are symmetrically arranged on both sides of the top of the inclined plate, and the openings of the gas collecting chambers are respectively facing the two side surfaces of the inclined plate; the surface of the inclined plate is made of hydrophobic material.
3. The intermittently released bubble coalescing device according to claim 2, characterized in that: The top of the gas collecting chamber includes a first top and a second top, one side of the first top is connected to the inclined plate, and the other side of the first top is connected to the second top, a gas collecting chamber is formed between the first top, the second top and the inclined plate, and the gas release port is located at the second top; the angle between the second top and the extension line of the inclined plate is 75°~120°.
4. The intermittently released bubble coalescing device according to claim 3, characterized in that: The diameter of the gas release port is not less than 10 mm; at least one partition is provided in the gas collecting chamber to separate the indoor space.
5. The intermittently released bubble coalescing device according to any one of claims 1 to 4, characterized in that: The rotating mechanism comprises a thrust rod and a fixed support beam. The thrust rod, the fixed support beam and the inclined plate are rotatably connected. The fixed support beam is fixed to push the thrust rod, thereby driving the inclined plate and the air collecting chamber to rotate.
6. The intermittently released bubble coalescing device according to claim 5, characterized in that: The lower part or bottom of the inclined plate is rotatably connected to the thrust rod, and the fixed support beam is rotatably connected to the middle part of the inclined plate.
7. The intermittently released bubble coalescing device according to claim 6, characterized in that: The thrust rod and the fixed support beam are connected to the inclined plate through fulcrum bearings respectively.
8. The intermittently released bubble coalescing device according to claim 5, characterized in that: A plurality of bubble aggregation components are arranged in parallel in at least two rows along the horizontal direction, and the ratio of the horizontal spacing b between two adjacent rows of bubble aggregation components to the horizontal projection width B of the bubble aggregation components satisfies b / B=0.8~0.95; the thrust rod and the fixed support beam are connected to each row of bubble aggregation components.
9. The intermittently released bubble coalescing device according to claim 5, characterized in that: The rotating mechanism comprises a driving mechanism, and the driving mechanism is connected to the thrust rod.
10. A digestion reactor, characterized in that: It comprises a reactor body, wherein a flow guide channel is arranged in the reactor body, and an intermittent bubble releasing agglomeration device as claimed in any one of claims 1 to 9 is arranged in the upper part of the flow guide channel.