Dynamic gas coalescence device and digestion reactor
By designing a dynamic gas convergence device in an anaerobic digestion reactor, and using vibration and hydrophobic inclined plate technology, the problem of poor mixing effect in the reactor is solved, and more efficient mass transfer and digestion reaction rate is achieved.
Patent Information
- Application Number
- CN202421043543.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-14
AI Technical Summary
In the existing anaerobic digestion reactors, due to the large reactor volume and high viscosity, the mixing effect is poor and the mass transfer is uneven, which increases investment and operation costs.
Design a dynamic gas convergence device to drive the bubble convergence member to vibrate in the reactor through a vibrating mechanism, and use a hydrophobic inclined plate to promote the desorption and convergence of small bubbles to form large bubbles. The released bubble kinetic energy forms local turbulence, improving Mass transfer process.
By improving the convergence and release of gases, the mixing energy in the reactor is increased, the mass transfer efficiency is improved, the mixing energy required for the digestion reaction is reduced, and the anaerobic digestion reaction rate is improved.
Smart Images
Figure CN222455010U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of digestion treatment, in particular to a dynamic gas aggregation device and a digestion reactor. Background Art
[0002] The biological anaerobic process is usually carried out in a large digester and requires good mixing to achieve efficient reaction. In actual production, due to the high solid content in the reactor and the poor mixing effect, the substrate and nutrients added to the reactor are difficult to be quickly transferred and distributed throughout the reactor volume. In addition, since the working conditions of anaerobic sludge and biomass digestion have non-Newtonian fluid characteristics, the mixing energy required is greater than that of other Newtonian fluids, and the difficulty of achieving mixing is also greater.
[0003] 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 in the reactor. The mechanical mixing method of the anaerobic reactor can be achieved by a variety of mechanical mixers. The commonly used method is to arrange a vertical shaft mixer (with or without a diversion channel) in the center of the reactor. For the mixing method of gas injection, part of the generated biogas is collected and compressed and then reinjected into the reactor from the low point at the bottom of multiple reactors. A diversion channel is usually set in the reactor to promote the circulation flow inside the reactor.
[0004] The above mixing methods are all 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, which can usually reach several thousand cubic meters, it leads to uneven feed distribution, low process efficiency, and long digestion residence time, which further leads 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 high turbulence areas around the mixing point, and some areas have little or no convective mass transfer, and there are dead zones.
[0005] In fact, the gas produced by anaerobic digestion is usually distributed in the entire anaerobic digestion reactor in the form of tiny, growable bubbles. The expansion of bubble size and the buoyancy generated by the bubbles provide a potential source of energy for mixing. In theory, the kinetic energy released by the gas production process in the anaerobic digestion reactor is equivalent to 10-30% of the energy corresponding to the design stirring power of the conventional digestion reactor. However, since the average size of the bubbles is usually below 2 mm, the bubble size is smaller than the minimum turbulent diameter required to induce turbulence (Kolmogorov diameter, also called Kolmogorov microscale), therefore, the kinetic energy released in the biogas production process cannot be converted into mixing energy. Utility Model Content
[0006] In view of the above technical problems, the utility model discloses a dynamic gas agglomeration device and a digestion reactor. The bubble agglomeration device is used to collect and agglomerate small bubbles attached to flocculent mud and granular mud, and after agglomerating them, release them in the reactor in the form of large bubbles to generate local turbulence, thereby improving the mass transfer process.
[0007] To this end, the technical solution of the utility model is:
[0008] A dynamic gas coalescing device comprises a plurality of bubble coalescing components arranged in a reactor, wherein the bubble coalescing components are connected to a vibration mechanism, and the vibration mechanism drives the bubble coalescing components to vibrate in the reactor;
[0009] The bubble gathering and releasing component includes a bubble collecting and releasing component and an inclined plate obliquely arranged in the reactor, wherein the bubble collecting and releasing component is connected to the upper part of the inclined plate; the bubble collecting and releasing component is provided with a gas collecting channel, the bottom of the gas collecting channel is downwardly open, the inclined bottom surface of the inclined plate is located below the opening, the top of the bubble collecting and releasing component is provided with a gas release hole, and the gas collecting channel is connected to the gas release hole; the surface of the inclined plate is made of hydrophobic material.
[0010] With this technical solution, the inclined plate is put into a vibrating motion state through a vibration mechanism, and the vibration energy is transferred to the medium between the inclined plates, which promotes the desorption of small bubbles from flocculent mud and granular mud. The inclined plate is made of hydrophobic material, which can promote the aggregation of bubbles during collision. The inclined plate is connected to the gas collection channel, and the desorbed small bubbles and the aggregated bubbles can be introduced into the gas release hole through the gas collection channel and released in the reactor 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, enhances convective mass transfer, and makes full use of the potential and available mixing energy of the small bubbles generated by the anaerobic digestion process.
[0011] As a further improvement of the present invention, the inclined plate is arranged to be inclined relative to the axial direction of the gas release hole.
[0012] As a further improvement of the utility model, the inclined plate has an inclination angle of 15-35° relative to the axial direction of the gas release hole. The inclination angle is the angle between the inclined bottom surface of the inclined plate and the axis of the gas release hole. Further, the inclination angle of the inclined plate is 20-30°. With this technical solution, it is possible to prevent scum from settling on the surface of the inclined plate.
[0013] As a further improvement of the utility model, the upper surface of the bubble collecting and releasing component is an inclined surface, an upwardly protruding curved surface, or an upwardly protruding folded surface. Furthermore, the gas release hole is located at a position close to the highest point on the upper surface of the bubble collecting and releasing component. Furthermore, the gas release hole is located at the highest point on the upper surface of the bubble collecting and releasing component. The use of this technical solution is conducive to the release of large bubbles.
[0014] As a further improvement of the present invention, the diameter of the gas release hole is not less than 10 mm.
[0015] As a further improvement of the present invention, the bubble collecting and releasing component is in the shape of an elongated strip.
[0016] As a further improvement of the utility model, the surface of the inclined plate is hydrophobic.
[0017] As a further improvement of the present invention, the inclined plate is made of polypropylene, polyvinyl chloride, stainless steel coated with polytetrafluoroethylene, etc.
[0018] As a further improvement of the utility model, the vibration mechanism includes a vibration driver and a vibration transmission rod, and the vibration driver is connected to the inclined plate through the vibration transmission rod to drive the inclined plate to vibrate.
[0019] As a further improvement of the present invention, the direction of the vibrating movement of the inclined plate is perpendicular to the surface of the inclined plate, and the angle range with the horizontal plane is ±30 degrees.
[0020] As a further improvement of the present invention, the vibration transmission rod is perpendicular to the surface of the inclined plate, and the vibration driver drives the vibration transmission rod to reciprocate along a direction perpendicular to the surface of the inclined plate.
[0021] As a further improvement of the utility model, a plurality of bubble agglomerating components are arranged in parallel in the horizontal direction to form at least one layer. In the same layer, the ratio of the horizontal spacing b between adjacent bubble agglomerating components and the horizontal projection width B of the bubble agglomerating components satisfies b / B=0.8~0.95; the vibration transmission rod is connected to the plurality of bubble agglomerating components in the same layer.
[0022] As a further improvement of the utility model, the gas release holes on each bubble aggregation component are evenly distributed on the horizontal cross section of the flow guide channel. The horizontal cross section of the flow guide channel here can be understood as a horizontal projection plane. With this technical solution, the mixing mass transfer effect in the reactor is better.
[0023] As a further improvement of the utility model, a plurality of bubble gathering components are connected into a row by connecting pieces, and can be assembled into components of appropriate width as required.
[0024] 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 dynamic gas aggregation device as described in any one of the above items.
[0025] As a further improvement of the utility model, an annular 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 hole, and the medium returns to the bottom of the reactor through the annular gap, so that the mixed mass transfer effect in the reactor is better.
[0026] Compared with the prior art, the beneficial effects of the utility model are:
[0027] First, the technical solution of the utility model is adopted to drive the bubble aggregation component to vibrate through the vibration mechanism, and the vibration energy is transferred to the medium. The reciprocating vibration motion overcomes the surface tension between the gas and the flocculent mud or granular mud, so that the bubbles are desorbed from the biological mud surface. When the bubbles encounter the hydrophobic inclined plate surface, the contact angle between the bubbles and the solid-liquid is smaller than the flocculent mud or granular mud to which they are attached, so the bubbles are attracted to the solid surface; then, the bubbles combine with each other and move along the inclined plate to the gas collection channel, and after merging into large bubbles, their kinetic energy is released, 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. The technical solution of the utility model is suitable for anaerobic digestion reactors with high gas production rates and using external circulation flow to achieve mixing. Compared with other aggregation devices, this device has a simple structure and lower installation costs.
[0028] Second, the technical solution of the utility model uses the inclined plate as the solid coalescence interface of the bubbles, which can greatly reduce the risk of scum accumulation. When the bubbles are introduced upward along the slope of the inclined plate in the gas collection channel and released into the gas release hole, the mixing effect of the medium in the reactor can be improved, and at the same time, the scum is taken out with the release of the bubbles. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is a schematic diagram of the structure of the dynamic gas aggregation device in the reactor of Example 1 of the utility model.
[0030] Figure 2 It is a structural schematic diagram of the dynamic gas aggregation device of Example 1 of the utility model.
[0031] Figure 3 It is a structural schematic diagram of the dynamic gas aggregation device of Example 2 of the utility model.
[0032] Figure 4 It is a schematic structural diagram of the dynamic gas aggregation device of Example 3 of the utility model.
[0033] Reference numerals include:
[0034] 1-reactor, 2-guiding channel, 3-dynamic bubble coalescence device, 4-medium, 5-annular gap, 6-vibration mechanism;
[0035] 10-bubble gathering component, 11-bubble collecting and releasing component, 12-inclined plate, 13-gas collecting channel, 14-gas releasing hole, 15-small bubbles, 16-large bubbles, 17-flocs or particles;
[0036] 31-lowest point, 32-connecting piece, 33-bubble aggregation component row;
[0037] 61-vibration driver, 62-vibration transmission rod. DETAILED DESCRIPTION
[0038] The preferred embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0039] Example 1
[0040] like Figure 1 and Figure 2 As shown, a dynamic gas agglomeration device includes a plurality of bubble agglomeration components 10 and a vibration mechanism 6 arranged in a flow guide channel 2 of a reactor 1, wherein the bubble agglomeration component 10 includes a bubble collecting and releasing component 11 and an inclined plate 12 obliquely arranged in the reactor 1, wherein the bubble collecting and releasing component 11 is connected to the upper portion of the inclined plate 12; the bubble collecting and releasing component 11 is provided with a gas collecting channel 13, the bottom of the gas collecting channel 13 is open downward, the inclined bottom surface of the inclined plate 12 is located below the opening, the top of the bubble collecting and releasing component 11 is provided with a gas release hole 14, and the gas collecting channel 13 is connected to the gas release hole 14; the surface of the inclined plate 12 is made of a hydrophobic material. The vibration mechanism 6 includes a vibration driver 61 and a vibration transmission rod 62, wherein the vibration driver 61 is connected to the inclined plate 12 through the vibration transmission rod 62 to drive the inclined plate 12 to vibrate.
[0041] The inclined plate 12 is arranged to be inclined relative to the axial direction of the gas release hole 14. The inclination angle α of the inclined plate 12 is 15-35°. That is, the angle between the inclined bottom surface of the inclined plate 12 and the axis of the gas release hole 14 is 15-35°. Further, the inclination angle of the inclined plate 12 is 20-30°.
[0042] Further, the vibration transmission rod 62 is perpendicular to the surface of the inclined plate 12, and the vibration driver 61 drives the vibration transmission rod 62 to reciprocate in a direction perpendicular to the surface of the inclined plate 12, that is, the direction of the vibration movement of the inclined plate 12 is perpendicular to its surface. Further preferably, the angle between the vibration direction and the horizontal plane is ±30 degrees.
[0043] Further, in this embodiment, the upper surface of the bubble collecting and releasing component 11 is an upwardly convex arc surface, and the gas releasing hole 14 is located at the highest point of the upper surface of the bubble collecting and releasing component 11. The diameter of the gas releasing hole 14 is not less than 10 mm.
[0044] Furthermore, the bubble collecting and releasing component 11 is in the shape of an elongated strip.
[0045] Furthermore, the gas release holes 14 of the plurality of bubble gathering components 10 are evenly arranged in the horizontal cross section of the flow guiding channel 2 .
[0046] With this technical solution, the small bubbles 15 generated in the reactor 1 rise to the dynamic bubble aggregation device 3 in the flow channel 2 along with the flow of the medium 4 in the reactor 1. The flocs or particles 17 attached with the small bubbles 15 rise and flow in the flow channel 2 until they contact the inclined plate 12 in a vibrating state. Under the action of vibration, the small bubbles 15 are desorbed from the flocs or particles 17, and then the small bubbles 15 are attached to the surface of the inclined plate 12 and then combined into a gas film. The gas collected in the gas collection channel 13 is released from the distributed gas release holes 14 in the form of large bubbles 16. The energy released by the large bubbles 16 helps to mix the medium in the reactor 1. The medium fluid flows through the annular gap 5 outside the flow channel 2 and returns to the bottom of the reactor 1, thereby improving the mixing effect of the medium 4 in the reactor 1.
[0047] Example 2
[0048] like Figure 3 As shown, based on Example 1, in this embodiment, a plurality of bubble-gathering members 10 are arranged in parallel in the horizontal direction, and the ratio of the horizontal spacing b between adjacent bubble-gathering members 10 and the horizontal projection width B of the bubble-gathering members 10 satisfies b / B=0.8-0.95. The number of layers of the bubble-gathering members 10 is at least one. The vibration transmission rod 62 is connected to the inclined plates 12 of the plurality of bubble-gathering members 10 in the same layer.
[0049] The gas release holes 14 on each bubble gathering member 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.
[0050] Example 3
[0051] like Figure 4As shown, on the basis of Example 2, in this embodiment, the upper surface of a single bubble collecting and releasing component 11 is a folded surface, the gas release hole 14 is located at the highest point in the middle of the upper surface of the bubble collecting and releasing component 11, and the two distal ends of the bubble collecting and releasing component 11 are the lowest points 31. A plurality of bubble gathering components 10 are connected to form a bubble gathering component row 33 by a connector 32. The bubble gathering component rows 33 are arranged at intervals to satisfy that the ratio of the horizontal spacing b between adjacent bubble gathering components 10 and the horizontal projection width B of the bubble gathering components 10 satisfies b / B=0.8~0.95. In each row of the bubble gathering component rows 33, each inclined plate 12 is connected to the vibration transmission rod 62, and the vibration transmission rod 62 is driven by the vibration driver 61, and the inclined plate 12 is driven to vibrate. With this technical solution, modular assembly can be performed according to the size of the reactor 1, and the compatibility is better.
[0052] Example 4
[0053] like Figure 1 As shown, a digestion reactor includes a reactor, wherein a flow guide channel 2 is provided in the reactor 1, and a dynamic gas agglomeration device 3 as described in any one of the above embodiments 1 to 3 is provided in the upper part of the flow guide channel 2, wherein the dynamic gas agglomeration device 3 is connected to the flow guide channel 2, and the inclined plate 12 is inclined relative to the axial direction of the flow guide channel 2. An annular gap 5 is provided between the reactor 1 body 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 hole 14, and the medium 4 returns to the bottom of the reactor 1 through the annular gap 5, and the mixed mass transfer effect in the reactor 1 is better.
[0054] 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.
[0055] 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.
[0056] 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.
[0057] 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 dynamic gas agglomeration device, characterized in that: The invention comprises a plurality of bubble merging components arranged in a reactor, wherein the bubble merging components are connected to a vibration mechanism, and the vibration mechanism drives the bubble merging components to vibrate in the reactor; The bubble gathering and releasing component includes a bubble collecting and releasing component and an inclined plate obliquely arranged in the reactor, the bubble collecting and releasing component is connected to the upper part of the inclined plate; the bubble collecting and releasing component is provided with a gas collecting channel, the bottom of the gas collecting channel is open downward, the inclined bottom surface of the inclined plate is located below the opening, the top of the bubble collecting and releasing component is provided with a gas release hole, the gas collecting channel is connected to the gas release hole; the surface of the inclined plate is made of hydrophobic material.
2. The dynamic gas agglomeration device according to claim 1, characterized in that: The inclined plate is disposed obliquely with respect to the axial direction of the gas release hole.
3. The dynamic gas agglomeration device according to claim 2, characterized in that: The inclined plate has an inclination angle of 15-35° relative to the axial direction of the gas release hole.
4. The dynamic gas agglomeration device according to claim 3, characterized in that: The upper surface of the bubble collecting and releasing component is an inclined surface, an upwardly protruding arc surface or an upwardly protruding folded surface; the gas release hole is located at the high point of the upper surface of the bubble collecting and releasing component; the diameter of the gas release hole is not less than 10 mm.
5. The dynamic gas agglomeration device according to any one of claims 1 to 4, characterized in that: The vibration mechanism comprises a vibration driver and a vibration transmission rod. The vibration driver is connected to the inclined plate through the vibration transmission rod to drive the inclined plate to vibrate.
6. The dynamic gas agglomeration device according to claim 5, characterized in that: The vibration transmission rod is perpendicular to the surface of the inclined plate, and the vibration driver drives the vibration transmission rod to reciprocate along a direction perpendicular to the surface of the inclined plate.
7. The dynamic gas agglomeration device according to claim 6, characterized in that: A plurality of bubble gathering components are arranged in parallel in the horizontal direction to form at least one layer. In the same layer, the ratio of the horizontal spacing b between adjacent bubble gathering components and the horizontal projection width B of the bubble gathering components satisfies b / B=0.8-0.
95. The vibration transmission rod is connected to the plurality of bubble gathering components in the same layer.
8. The dynamic gas agglomeration device according to claim 7, characterized in that: A plurality of bubble coalescing components are connected in a row through connecting members.
9. A digestion reactor, characterized in that: It comprises a reactor body, wherein a flow guiding channel is arranged in the reactor body, and the upper part of the flow guiding channel is provided with a dynamic gas agglomeration device as claimed in any one of claims 1 to 8.
10. The digestion reactor according to claim 9, characterized in that: An annular gap is provided between the reactor body and the flow guiding channel.