Anaerobic fermentation system and control method
By using the design of combining the outer ring fermentation tank and the inner ring fermentation tank in the anaerobic fermentation system, the sequential feeding and alternating feeding of materials are achieved by using multiple symmetrically arranged tangential feeding pipes to form an annular channel, which solves the problem of current There are problems of high cost and poor stability of the mixing equipment in the technology, which achieves full mixing of materials and improves the mixing effect.
Patent Information
- Application Number
- CN202411236689.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2024-12-24
AI Technical Summary
The agitating equipment of the existing anaerobic fermentation system is expensive to purchase and complex to maintain, resulting in huge economic losses, and it is difficult for the existing agitating form to achieve stable material mixing and stirring effects.
The design of combining the outer ring fermentation tank and the inner ring fermentation tank is adopted. The sequential feeding and alternating feeding of materials are realized through multiple symmetrically arranged tangential feeding pipes, forming an annular channel to limit the flow direction of the material and achieving full mixing of materials. and stir.
Through this design, the orderly flow and stable stirring of materials are achieved, the equipment damage and maintenance costs are reduced, and the mixing and stirring effect is improved.
Smart Images
Figure CN119177153A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of anaerobic fermentation, and in particular to an anaerobic fermentation system and a control method. Background Art
[0002] There are various stirring forms for fermentation tanks in biogas projects, including submersible agitators, oblique-insertion agitators, top agitators, and side agitators. Agitators can fully mix materials and increase gas production, but the purchase cost of the equipment is high, especially for imported products. In addition, when the agitator is damaged and repaired, the tank needs to be cleaned and restarted, which is a huge project and brings huge economic losses. Summary of the invention
[0003] The content of the present invention is used to introduce the concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of the present disclosure is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.
[0004] Some embodiments of the present invention provide an anaerobic fermentation system and a control method to solve the technical problems mentioned in the above background technology section.
[0005] In a first aspect, some embodiments of the present invention provide an anaerobic fermentation system, comprising an outer ring fermenter, an inner ring fermenter disposed inside the outer ring fermenter, two or more feed assemblies uniformly and arranged in pairs around the outer ring fermenter, and a discharge assembly connected to the outer ring fermenter and the inner ring fermenter;
[0006] The two feed assemblies in each pair of the feed assemblies are symmetrically arranged relative to the axis center of the outer ring fermenter; each of the feed assemblies comprises a plurality of tangential feed pipes arranged vertically, and each of the feed pipes is tangentially connected to the outer ring fermenter;
[0007] During the feeding process, the multiple tangential feeding pipes in each feeding assembly feed in sequence from bottom to top; the two feeding assemblies in each pair of the feeding assemblies feed in sequence; in response to there being more than two feeding assemblies, multiple pairs of feeding assemblies feed in sequence.
[0008] In a second aspect, some embodiments of the present invention provide a control method for the above-mentioned anaerobic fermentation system, comprising:
[0009] The discharging component discharges the corresponding material before feeding according to the feeding amount of each feeding stage;
[0010] The multiple tangential feed pipes of one of the feed assemblies in a pair of feed assemblies complete the feed stages in sequence, and each feed stage is separated by a preset time to form a cycle unit;
[0011] The feeding stage of another feeding assembly in the feeding assembly is operated alternately with the feeding stage of the above feeding assembly;
[0012] In response to there being more than two feeding assemblies, multiple pairs of feeding assemblies feed in sequence.
[0013] The above-mentioned embodiments of the present invention have the following beneficial effects: through the anaerobic fermentation system of the present invention, the effect of mixing and stirring materials can be achieved while feeding.
[0014] Specifically, as the material is added, multiple tangential feeding pipes feed in sequence from bottom to top, forming multiple feeding stages. Each feeding stage can be separated by a preset time. In this way, by feeding in sequence, the impact of the material on the outer ring fermentation tank and the inner ring fermentation tank can be reduced, so that the material flows in an orderly manner and the stability of stirring is improved.
[0015] After the feeding component completes a feeding stage, the corresponding tangential feeding pipe of another feeding component starts feeding and completes a corresponding feeding stage. The two components are operated alternately in this way, thereby achieving full mixing of the materials and achieving the purpose of stirring.
[0016] Since the two feeding components are symmetrically arranged relative to the axis center of the outer ring fermenter, and the tangential feeding pipe 31 is arranged along the tangent direction of the outer circumference of the outer ring fermenter 1, during the feeding process, the material can be rotated along the inner wall of the outer ring fermenter 1 to achieve the effect of mixing and stirring the material. Furthermore, the feeding stages of the two feeding components are operated alternately, so that the material in the tank can be pushed in two directions in turn, ensuring the flow of the material and further improving the effect of mixing and stirring the material.
[0017] In addition, the inner ring fermentation tank can form an annular channel with the outer ring fermentation tank, thereby limiting the flow direction of the material and improving the mixing and stirring effect of the material. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 A top view of an embodiment of an anaerobic fermentation system of the present invention;
[0020] Figure 2 It is a structural schematic diagram of an embodiment of a feed assembly of the present invention;
[0021] Figure 3It is a structural schematic diagram of an embodiment of a discharging assembly of the present invention;
[0022] Figure 4 The present invention is a flow chart of an embodiment of a control method for an anaerobic fermentation system.
[0023] Description of reference numerals:
[0024] 1: outer ring fermentation tank;
[0025] 2: inner ring fermentation tank; 21: inner tank body; 22: funnel; 23: uniform distributor; 24: filler; 25: central column;
[0026] 3: feed assembly; 31: tangential feed pipe; 32: top feed pipe; 33: feed tank; 34: water collector; 35: receiving tank;
[0027] 4: discharging assembly; 41: overflow pipe; 42: water seal tank; 43: outer ring mud discharge pipe; 44: inner ring mud discharge pipe; 45: temporary storage tank. DETAILED DESCRIPTION
[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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 invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0031] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.
[0032] First see Figure 1 and Figure 2 , Figure 1 A top view of an embodiment of an anaerobic fermentation system of the present invention; Figure 2 FIG. 1 is a schematic diagram of the structure of an embodiment of a feed assembly of the present invention. Figure 1 and Figure 2 As shown, the anaerobic fermentation system includes an outer ring fermentation tank 1, an inner ring fermentation tank 2 arranged inside the outer ring fermentation tank 1, a plurality of feed assemblies 3 evenly arranged outside the outer ring fermentation tank 1, and a discharge assembly 4 connected to the outer ring fermentation tank 1 and the inner ring fermentation tank 2. The structure of the outer ring fermentation tank 1 is the same as the existing fermentation tank body structure, for example, a tank top gas storage film is arranged on the top.
[0033] The inner ring fermentation tank 2 includes an inner tank body 21, a central column 25, a funnel 22, a uniform distributor 23 and a filler 24. The height of the inner tank body 21 is lower than the liquid level of the material in the outer ring fermentation tank 1, so that the material can overflow into the inner tank body 21. Those skilled in the art can determine the height difference between the inner tank body 21 and the liquid level of the material according to actual conditions or repeated tests. The funnel 22, the uniform distributor 23 and the filler 24 are connected to the inner wall of the inner tank body 21 from high to low.
[0034] Specifically, the central column 25 is arranged in the inner tank body 21, and the upper end of the central column 25 can be connected to the upper end support frame of the outer ring fermentation tank 1. Multiple layers of support members can be arranged in the inner tank body 21. In the assembled state, the funnel 22, the uniform distributor 23 and the filler 24 are tightly sleeved on the central column 25, and a sealing ring can be arranged to improve the sealing performance. The upper edge of the funnel 22 can be welded to the upper edge of the inner tank body 21. The inclination angle of the funnel 22 to the horizontal plane can be 20°-25°, which can be determined by those skilled in the art according to actual conditions. The uniform distributor 23 and the filler 24 can be connected to the support member, which can be an angle steel fixed to the inner tank body 31 by bolts. The circumference of the uniform distributor 23 and the filler 24 can be welded to the inner wall of the inner tank body 21 or sealed. The uniform distributor 23 can be conical, and the inclination angle with the horizontal plane can be 20°-25°. A plurality of holes can be opened on the uniform distributor 23. A carrier is placed in the filler 24, and the carrier is used to enrich methanogens, so as to produce gas efficiently and stably. As an example, the carrier can be a polymer filler or a ceramic filler. In the working state, the material overflows into the funnel 22, and falls evenly into the filler 24 through the holes of the uniform distributor 23, thereby generating biogas.
[0035] Continue reading Figure 1 and Figure 2 The two feed assemblies 3 form a pair of feed assemblies 3. The two feed assemblies 3 are arranged symmetrically with respect to the axis center of the outer ring fermenter 1. Each feed assembly 3 feeds along the tangent direction of the outer circumference of the outer ring fermenter 1 during feeding. It should be noted that although Figure 1 The example of two feed assemblies 3 constituting a pair of feed assemblies 3 is shown, but those skilled in the art can adjust the number of feed assemblies 3 according to the size of the outer ring fermentation tank 1 to form multiple pairs of feed assemblies 3.
[0036] like Figure 2 As shown, each feed assembly 3 includes a feed tank 33, a water collector 34, a plurality of tangential feed pipes 31 and a top feed pipe 32. The water collector 34 is connected to the feed tank 33 through a pipeline, and a feed pump is arranged on the above pipeline. The plurality of tangential feed pipes 31 are vertically connected to the water collector 34. The plurality of tangential feed pipes 31 are arranged along the tangent direction of the outer circumference of the outer ring fermentation tank 1. The two paired feed assemblies 3 are arranged symmetrically relative to the axis center of the outer ring fermentation tank 1.
[0037] In the working state, the material is added to the receiving tank 35, and then the material overflows from the receiving tank 35 to the feeding tank 33. After the feed pump is started, the material can be transferred to the water collector 34. Multiple tangential feed pipes 31 can be fed sequentially from bottom to top to form multiple feeding stages. Each feeding stage can be separated by a preset time. In this way, by feeding in sequence, the impact of the material on the outer ring fermentation tank 1 and the inner ring fermentation tank 2 can be reduced, so that the material flows in an orderly manner and the stability of stirring is improved. It should be noted that those skilled in the art can repeatedly test and determine the outlet pressure of the feed pump, so as to adapt to anaerobic fermentation systems with different processing capacities, so that the movement of the material can be driven during feeding. After the feed component 3 completes any feeding stage, the corresponding tangential feed pipe 31 of the other feed component 3 starts feeding and completes a corresponding feeding stage. In this way, the feed is fed from two directions, and the material movement is successively promoted, thereby achieving full mixing of the material and achieving the purpose of stirring.
[0038] Since the two feeding components are symmetrically arranged with respect to the axis center of the outer ring fermenter, the tangential feeding pipe 31 is arranged along the tangent direction of the outer circumference of the outer ring fermenter 1, so that during the feeding process, the material can be fed clockwise ( Figure 1 Furthermore, the feeding stages of the two feeding assemblies 3 are operated alternately, so that the materials in the tank can be pushed in two directions in turn, ensuring the flow of the materials and further improving the effect of mixing and stirring the materials.
[0039] In addition, the inner ring fermentation tank 2 can form an annular channel with the outer ring fermentation tank 1, thereby limiting the flow direction of the material and improving the mixing and stirring effect of the material. It should be noted that those skilled in the art can adjust the feed pressure through the feed water pump according to the mixing and stirring conditions, thereby adjusting the flow rate of the feed.
[0040] Furthermore, the upper end of the water collector 34 can also be connected to a top feed pipe 32, the discharge port of which is higher than the material liquid level. During the feeding process, after the tangential feed pipe 31 and the top feed pipe 32 have completed feeding in turn, the top feed pipe 32 can be opened to serve as a pressure balance pipe to stabilize the internal pressure of the system. It should be noted that each tangential feed pipe 31 can be fed individually, or multiple adjacent tangential feed pipes 31 can be fed as a group.
[0041] It should be noted that when the system includes multiple pairs of feeding assemblies 3, when two feeding assemblies 3 in a pair of feeding assemblies 3 have completed feeding, the next adjacent pair of feeding assemblies 3 will continue feeding.
[0042] See also Figure 3 , Figure 3FIG. 4 is a schematic structural diagram of an embodiment of a discharging assembly 4 of the present invention. Figure 3 As shown, the discharge assembly 4 includes a funnel-shaped overflow pipe 41, which can be located below the material liquid level. A person skilled in the art can adjust the distance between the overflow pipe 41 and the material liquid level according to the discharge situation. The outlet end of the overflow pipe 41 is inserted into the water seal tank 42 to prevent the overflow of biogas. A temporary storage tank 45 connected to the water seal tank 42 can also be provided to store the discharged material. The number of overflow pipes 41 can be two, which operate alternately during discharge.
[0043] The feeding of the feeding component 3 can be carried out after the overflow pipe 41 discharges the material, and the discharge amount of the overflow pipe 41 can correspond to the feed amount of each stage of the feeding component 3.
[0044] The above-mentioned discharge assembly 4 also includes an outer ring mud discharge pipe 43 and an inner ring mud discharge pipe 44. The inlet end of the above-mentioned outer ring mud discharge pipe 43 can be connected to the bottom of the outer ring fermentation tank 1, and the outlet end of the outer ring mud discharge pipe 43 can be connected to the pipeline of the overflow pipe 41. The above-mentioned inner ring mud discharge pipe 44 can be set on the basis of the position of the inner ring mud discharge pipe 44 by pre-buried mode, and the outlet end of the inner ring mud discharge pipe 44 is inserted into the water seal pool 42. In order to make the mud discharge smooth, the slope of the inner ring mud discharge pipe 44 can be 5‰-10‰. The inner ring mud discharge pipe 44 and the outer ring mud discharge pipe 43 can be discharged to the water seal pool once within a preset number of days, for example, 7 days, and the discharge amount can correspond to the daily processing amount of the material. When discharging mud, it can be discharged first and then fed. When discharging mud, it should be discharged slowly. It is advisable to manually control the discharge, and observe the pressure and liquid level in the tank in real time to avoid negative pressure in the tank.
[0045] The present application also provides a control method for the anaerobic fermentation system described in the above embodiments. Figure 4 As shown, it shows a process 400 of an embodiment of a control method for an anaerobic fermentation system of the present invention. The control method comprises the following steps:
[0046] Step 401, the discharging component discharges the corresponding material before feeding according to the feeding amount of each feeding stage.
[0047] In some embodiments, the execution subject of the control method may be a controller, such as a PLC (Programmable Logic Controller), which may be connected to the valves, feed pumps, etc. of the feed assembly 3 and the discharge assembly 4 to control opening or closing.
[0048] The controller controls the discharge assembly 4 so that the discharge assembly 4 discharges the material corresponding to each feeding stage, thereby maintaining the feed and discharge balance of the anaerobic fermentation system. The discharge amount of the material can be collected by a flow meter arranged on the pipeline, and the flow meter can be connected to the controller for communication.
[0049] Step 402, a plurality of tangential feed pipes of one of a pair of feed assemblies completes a feed stage in sequence, and each feed stage is separated by a preset time to form a cycle unit.
[0050] In some embodiments, the controller can control the valve of the corresponding tangential feed pipe 31 to open, and with the help of the feed pump, the material flows from the corresponding tangential feed pipe 31 into the outer ring fermentation tank 1 to complete a feeding stage. It should be noted that one tangential feed pipe 31 can be opened in each feeding stage, or multiple adjacent tangential feed pipes 31 can be opened. Those skilled in the art can determine according to actual conditions.
[0051] When a top feed pipe 32 is provided on the water collector 34, when the tangential feed pipe 31 starts feeding, the other tangential feed pipes 31 and the top feed pipe 32 are closed. After the tangential feed pipe 31 completes feeding, the controller controls the tangential feed pipe 31 to close, and opens the top feed pipe 32 at the same time, thereby adjusting the air pressure in the outer ring fermentation tank 1. Finally, the top feed pipe 32 is fed, and after the feeding is completed, the valve remains open.
[0052] Step 403: the feeding phase of another feeding component in the feeding components is operated alternately with the feeding phase of the above feeding component.
[0053] In some embodiments, the feeding stages of the two feeding assemblies 3 can be fed alternately in correspondence. For example, after the tangential feeding pipe 31 at the bottom of one feeding assembly 3 completes the feeding stage, the tangential feeding pipe 31 at the bottom of another feeding assembly 3 completes the feeding stage.
[0054] Step 404 , in response to there being more than two feeding assemblies, multiple pairs of feeding assemblies feed in sequence.
[0055] In some embodiments, when there are multiple pairs of feeding assemblies 3, after both feeding assemblies 3 in a pair of feeding assemblies 3 have completed feeding, the next adjacent pair of feeding assemblies 3 will continue feeding. The feeding assemblies can be arranged in a clockwise direction or a counterclockwise direction.
[0056] Next, a 240m 3 Taking the anaerobic fermentation system of materials as an example, it is assumed that the anaerobic fermentation system is filled with materials. The system includes two feeding components 3, each feeding component 3 feeds 120m per day. 3 If the feed component 3 is cycled and fed 6 times, each cycle unit feeds 20m3 If each cycle unit includes four feeding stages, then each feeding stage feeds 5m 3 .
[0057] When the feed pump selects a flow rate of 60m 3 / h, that is, 5m3 of feed in five minutes 3 The specific steps are as follows:
[0058] 1) Before each feeding stage, the discharging assembly 4 discharges 5m 3 Material, corresponding to the feed amount in each feeding stage.
[0059] 2) Receiving pool 35 pours into 120m 3 The material flows into the feed tank 33 through the overflow, and is pumped into the water collector 34 through the feed pump. The two tangential feed pipes 31 at the bottom are opened, and the other tangential feed pipes 31 are closed. The material is fed for 5 minutes, i.e., 5m 3 After the feeding is finished, the two tangential feeding pipes 31 are closed and the top feeding pipe 32 is opened.
[0060] After a preset time interval of 1 hour, feed is sequentially carried out from the two upper tangential feed pipes, as in the above steps, to complete the second and third feeding stages.
[0061] The fourth feeding stage is completed by feeding from the top feeding pipe 32. After the feeding is completed, the top feeding pipe 32 remains open.
[0062] 3) At the same time, the feeding stage of another feeding assembly 3 is operated alternately corresponding to the feeding stage of the above feeding assembly 3, so as to achieve full mixing of the materials and achieve the purpose of stirring. In other words, the two feeding assemblies 3 alternately complete their respective 4 feeding stages, and each feeding assembly 3 forms a circulation unit.
[0063] 4) The inner ring mud discharge pipe 44 and the outer ring mud discharge pipe 43 are drained once every 7 days, and 240m3 is drained each time 3 To the water seal tank, it can be discharged alternately. When discharging mud, it can be discharged first and then fed. When discharging mud, it should be discharged slowly, and it is advisable to use manual control of the discharge, and observe the pressure and liquid level in the tank in real time to avoid negative pressure in the tank.
[0064] It should be noted that the number of cycles B of the circulation unit and the feed volume v of each feeding stage can be determined by the daily processing volume V of the system, the set number of feeding components N, the number of feeding stages F of each feeding component, and the preset time T of interval feeding:
[0065] B = 24 / (F*T);
[0066] v = V / (N * F * B);
[0067] Finally, the running time of the feed pump can be determined by the feed volume v of each feed stage and the flow parameters of the feed pump.
[0068] The above formula can be used to determine the number of cycles of the circulation unit, the feed amount in each feeding stage, and the running time of the feed pump, so that the controller can accurately and automatically control the feeding and discharging, thereby improving the automation performance of the system.
[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. An anaerobic fermentation system, characterized in that: It comprises an outer ring fermenter, an inner ring fermenter arranged inside the outer ring fermenter, two or more feed assemblies evenly and in pairs arranged around the outer ring fermenter, and a discharge assembly connected to the outer ring fermenter and the inner ring fermenter; The two feed assemblies in each pair of the feed assemblies are symmetrically arranged relative to the axis center of the outer ring fermenter; each of the feed assemblies comprises a plurality of tangential feed pipes arranged vertically, and each of the feed pipes is tangentially connected to the outer ring fermenter; During the feeding process, multiple tangential feeding pipes in each feeding assembly feed in sequence from bottom to top to form multiple feeding stages; the feeding stages of each pair of the feeding assemblies operate alternately; in response to there being more than two feeding assemblies, multiple pairs of feeding assemblies feed in sequence.
2. The anaerobic fermentation system according to claim 1, characterized in that: Each of the feed components further comprises a feed tank and a water collector which are connected to each other, and the water collector is connected to each tangential feed pipe.
3. The anaerobic fermentation system according to claim 2, characterized in that: Each of the feed assemblies further comprises a top feed pipe arranged at the upper end of the water collector, the height of the top feed pipe being higher than the material liquid level, and the top feed pipe being configured to remain open after each tangential feed pipe is fed.
4. The anaerobic fermentation system according to claim 3, characterized in that: A feed pump is also provided between the feed tank and the water collector, and the outlet pressure of the feed pump is determined according to the size of the outer ring fermentation tank.
5. The anaerobic fermentation system according to claim 1, characterized in that: The inner ring fermentation tank includes an inner tank body and a funnel, a uniform distributor and a filler connected to the inner wall of the inner tank body from high to low. The height of the inner tank body is lower than the material liquid level; the funnel guides the overflowing material into the uniform distributor; the filler is used to provide a gas production environment for methanogens.
6. The anaerobic fermentation system according to claim 1, characterized in that: The uniform distributor is conical and is provided with a plurality of holes.
7. The anaerobic fermentation system according to claim 5, characterized in that: A central column is arranged in the inner tank body, and the funnel, the uniform distributor and the filler are sleeved on the central column. The funnel, the uniform distributor and the filler are all connected to the supporting member in the inner tank body.
8. The anaerobic fermentation system according to claim 1, characterized in that: The discharging assembly comprises a funnel-shaped overflow pipe arranged below the material liquid level, and the outlet end of the overflow pipe is inserted into the water seal pool.
9. The anaerobic fermentation system according to claim 8, characterized in that: The discharge assembly also includes an outer ring mud discharge pipe and an inner ring mud discharge pipe. The outer ring mud discharge pipe is arranged at the lower position of the outer ring fermentation tank and is connected with the overflow pipe; the inner ring mud discharge pipe is connected to the water seal pool from the bottom of the inner ring fermentation tank.
10. A control method for an anaerobic fermentation system as claimed in any one of claims 1 to 9, characterized in that: The method comprises: The discharging component discharges the corresponding material before feeding according to the feeding amount of each feeding stage; The multiple tangential feed pipes of one of the feed assemblies in a pair of feed assemblies complete the feed stages in sequence, and each feed stage is separated by a preset time to form a cycle unit; The feeding stage of another feeding assembly in the feeding assembly is operated alternately with the feeding stage of the above feeding assembly; In response to there being more than two feeding assemblies, multiple pairs of feeding assemblies feed in sequence.