Anaerobic fermentation device
By introducing the design of circulation pipes and circulation pumps into the anaerobic fermentation device, efficient anaerobic fermentation without stirring is achieved, reducing costs and improving reaction efficiency and uniformity.
Patent Information
- Application Number
- CN202422694213.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-05
AI Technical Summary
Existing anaerobic fermentation devices require constant stirring, are complex in structure and are costly.
The design of circulation pipe, circulation pump and circulation inlet allows the liquid to circulate multiple times in the fermentation tank to increase the contact time of microorganisms. The special structural design of the circulation pipe and the functions of heating and liquid level detection ensure that the reaction is sufficient and uniform.
No stirring device is required, which reduces the device cost, improves the reaction efficiency and uniformity, prolongs the reaction time, and simplifies the device structure.
Smart Images
Figure CN223422666U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of anaerobic fermentation, and more specifically, relates to an anaerobic fermentation device. Background Art
[0002] Anaerobic fermentation is a biochemical reaction process carried out by microorganisms under oxygen-free conditions, producing energy and metabolic products by breaking down organic matter. It can be applied to agricultural waste, kitchen waste centrifuge, wastewater, and other fields to generate biogas energy. Consequently, anaerobic fermentation, which produces methane gas by fermenting organic matter, is gaining increasing attention. However, anaerobic fermentation requires stringent control conditions and high operational requirements. The equipment must be sealed and continuously stirred, making existing anaerobic fermentation equipment complex and costly. Utility Model Content
[0003] The purpose of the embodiments of the present application is to provide an anaerobic fermentation device to solve the technical problem in the prior art that anaerobic fermentation devices need to be stirred continuously.
[0004] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide an anaerobic fermentation device, including a fermentation tank, a circulation pipe and a circulation introduction piece; the fermentation tank has a feed inlet arranged near its bottom and used to add the liquid to be treated into the fermentation tank, and a biogas outlet for discharging biogas; the fermentation tank also has a first interface and a second interface, the first end of the circulation pipe is connected to the second interface on the outside of the fermentation tank, the circulation pipe is arranged through the first interface, the second end of the circulation pipe is inserted from the first interface into the inner center of the fermentation tank and near the top, the circulation introduction piece is connected to the second end of the circulation pipe, and the opening of the circulation introduction piece faces upward to introduce the liquid to be treated into the circulation pipe; a first circulation pump is provided in the circulation pipe.
[0005] In some embodiments, the inner diameter of the circulation introduction member gradually decreases from top to bottom.
[0006] In some embodiments, the circulation pipe includes an inner circulation portion and an outer circulation portion; the inner circulation portion includes a vertical section and a horizontal section, the vertical section extends vertically downward from the circulation introduction member, and the horizontal section extends horizontally from the vertical section to the first interface; the outer circulation portion extends from the first interface through vertical and horizontal bends to the second interface;
[0007] The external circulation part is connected with a sludge filtrate pipe.
[0008] In some embodiments, a thermometer is installed in the circulation pipe, and a heating pipeline for heating the liquid to be treated in the circulation pipe is connected in parallel to the circulation pipe, and a second circulation pump is provided in the heating pipeline.
[0009] In some embodiments, a pressure level gauge is installed in the circulation pipe, and the pressure level gauge is used to detect the liquid level in the fermentation tank to prevent the liquid level from being too low.
[0010] In some embodiments, an overflow port is provided on the side wall of the fermentation tank at a position higher than the circulation introduction member, and the overflow port is used to overflow the liquid to be treated whose liquid level is higher than the overflow port into the anaerobic buffer tank or the biogas tank;
[0011] The fermentation tank further comprises a reflux port, which is connected to the anaerobic buffer tank.
[0012] In some embodiments, the fermentation tank is further provided with a discharge assembly near the top, and the discharge assembly is connected to the anaerobic buffer tank or the biogas tank.
[0013] In some embodiments, the discharge assembly includes a discharge pipe and a discharge piece, the third end of the discharge pipe extends into the interior of the fermentation tank and is higher than the circulation inlet piece, the fourth end of the discharge pipe extends out of the fermentation tank to be connected to the anaerobic buffer tank or the sludge pool, and the discharge piece is installed at the third end of the discharge pipe.
[0014] In some embodiments, the anaerobic fermentation device further includes a water pipe, which includes a main body and multiple branches. The main body extends from the second interface to the inner wall of the fermentation tank opposite to the second interface, and the branches are distributed in sequence along the length extension direction of the main body.
[0015] In some embodiments, the bottom of the fermenter has a guide surface, which extends downward from the inner periphery of the fermenter to the bottom center of the fermenter, and the bottom center of the fermenter is connected to the sand discharge pool through a sand discharge pipe.
[0016] The beneficial effect of the anaerobic fermentation device provided by the present application is that: through the arrangement of the circulation pipe, the first circulation pump and the circulation introduction member, the driving force of the first circulation pump enables the treated liquid in the fermentation tank to enter the circulation pipe through the circulation introduction member in sequence for circulation, and through multiple circulations, thereby increasing the contact time between the treated liquid and the microorganism, so that the organic matter and the microorganism can fully react, and there is no need to set a stirring device to continuously stir the treated liquid in the fermentation tank, thereby simplifying the anaerobic fermentation device and reducing the production cost of the anaerobic fermentation device. In addition, by inserting the second end of the circulation pipe from the first interface into the inner center of the fermentation tank and near the top, and the feed port is set near the bottom, the treated liquid can gradually rise from the bottom of the fermentation tank to the top of the fermentation tank, and then enter the circulation pipe from the top of the fermentation tank for circulation, so that the movement trajectory of the treated liquid is long, the contact time is longer, the reaction time is long, and the reaction is more sufficient; and the treated liquid in the fermentation tank can enter the circulation pipe located in the center in sequence along the periphery, so that the circulation effect is more uniform and the reaction is more uniform and sufficient. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0018] Figure 1 A schematic diagram of the structure of the anaerobic fermentation device provided in an embodiment of the present application;
[0019] Figure 2 An enlarged schematic diagram of a fermentation tank portion corresponding to the anaerobic fermentation device provided in an embodiment of the present application;
[0020] Figure 3 This is a schematic diagram of the corresponding circulation pipe portion of the anaerobic fermentation device provided in an embodiment of the present application.
[0021] Among them, the reference numerals in the figures are:
[0022] 100, fermenter; 110, tank body; 111, feed port; 112, first interface; 113, second interface; 114, overflow port; 115, reflux port; 116, guide surface; 117, sampling port; 120, water seal structure; 121, biogas outlet; 200, circulation pipe; 210, internal circulation unit; 211, vertical section; 212, horizontal section; 220, external circulation unit; 221, first pipe section; 222, second pipe section; 223, third pipe section; 230, first end; 240, second end; 300, circulation inlet; 400, first circulation pump; 500, sludge filtrate pipe; 600, heating pipeline; 610, liquid inlet pipe; 620, liquid outlet pipe; 630, heater; 640, second circulation pump; 700, anaerobic buffer tank; 800, biogas tank; 900, discharge assembly; 910, discharge pipe; 920, discharge part; 1000, water pipe; 1001, main body; 1002, branch; 1100, sand discharge pipe; 1200, sand discharge tank; 1300, biogas pipe; 1400, biogas tank. DETAILED DESCRIPTION
[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0024] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.
[0025] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 this application.
[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0027] See also Figures 1 to 3 The anaerobic fermentation device provided in the embodiment of the present application is now described. The anaerobic fermentation device is used to convert kitchen waste centrifuge liquid and sludge filtrate to be treated liquid into biogas under anaerobic conditions for subsequent use.
[0028] The anaerobic fermentation device includes a fermentation tank 100, a circulation pipe 200 and a circulation introduction member 300. The fermentation tank 100 has a feed inlet 111 arranged near its bottom for adding the liquid to be treated into the fermentation tank 100, and a biogas outlet 121 for discharging the output gas; the fermentation tank 100 also has a first interface 112 and a second interface 113. The first end 230 of the circulation pipe 200 is connected to the second interface 113 outside the fermentation tank 100. The circulation pipe 200 is arranged through the first interface 112. The second end 240 of the circulation pipe 200 is inserted from the first interface 112 into the inner center of the fermentation tank 100 and near the top. The circulation introduction member 300 is connected to the second end 240 of the circulation pipe 200. The opening of the circulation introduction member 300 faces upward to introduce the liquid to be treated into the circulation pipe 200; a first circulation pump 400 is provided in the circulation pipe 200.
[0029] Among them, the circulation introduction part 300 is a structure with openings at the top and bottom. Its bottom opening is connected to the circulation pipe 200, and its top opening is used to introduce the treated liquid that reaches a preset liquid level in the fermentation tank 100 into the circulation pipe 200. The treated liquid is passed through the outside of the fermentation tank 100 and enters the fermentation tank 100 again from the second interface 113 through the circulation pipe 200. Through the action of the first circulation pump 400, the treated liquid is circulated inside and outside the circulation pipe 200 many times, thereby increasing the contact time between the treated liquid and the microorganisms, so that the two can fully react.
[0030] The anaerobic fermentation device in the embodiment of the present application, through the arrangement of the circulation pipe 200, the first circulation pump 400 and the circulation introduction piece 300, through the driving force of the first circulation pump 400, enables the treated liquid in the fermentation tank 100 to enter the circulation pipe 200 through the circulation introduction piece 300 in sequence for circulation. Through multiple circulations, the contact time between the treated liquid and the microorganisms is increased, so that the organic matter and the microorganisms can fully react. There is no need to set up a stirring device to continuously stir the treated liquid in the fermentation tank 100, which simplifies the anaerobic fermentation device and reduces the production cost of the anaerobic fermentation device. In addition, by inserting the second end 240 of the circulation pipe 200 from the first interface 112 into the inner center of the fermentation tank 100 and near the top, and the feed port 111 is set close to the bottom, the liquid to be treated can gradually rise from the bottom of the fermentation tank 100 to the top of the fermentation tank 100, and then enter the circulation pipe 200 from the top of the fermentation tank 100 for circulation, so that the movement trajectory of the liquid to be treated is long, the contact time is longer, the reaction time is long, and the reaction is more sufficient; and the liquid to be treated in the fermentation tank 100 can enter the circulation pipe 200 located in the center in sequence along the periphery, so that the circulation effect is more uniform and the reaction is more uniform and sufficient.
[0031] In some embodiments, see Figure 1 and Figure 2 The inner diameter of the circulation introduction member 300 gradually decreases from the top to the bottom. This configuration allows the inner circumference of the circulation introduction member 300 to guide the liquid to be treated, and can quickly guide the liquid to be treated to the circulation pipe 200 to achieve circulation.
[0032] Specifically, the outer circumferential surface of the circulation introduction member 300 is a conical surface, and the inner circumferential surface of the circulation introduction member 300 is also a conical surface. The conical surface guides the liquid to be treated to achieve a better guiding effect. Of course, in other embodiments, the outer circumferential surface and the inner circumferential surface of the circulation introduction member 300 can also be curved surfaces or arc surfaces, and this is not a sole limitation here.
[0033] Optionally, see Figure 1 and Figure 2 The center line of the circulation introduction part 300 coincides with the center line of the fermentation tank 100, so that the liquid to be treated on the inner periphery of the fermentation tank 100 can evenly enter the circulation introduction part 300, and the circulation is more sufficient and uniform.
[0034] In some embodiments, see Figure 2 and Figure 3The circulation pipe 200 includes an inner circulation part 210 and an outer circulation part 220. The inner circulation part 210 includes a vertical section 211 and a horizontal section 212. The vertical section 211 extends vertically downward from the circulation inlet 300, and the horizontal section 212 extends horizontally from the vertical section 211 to the first interface 112; the outer circulation part 220 bends vertically and horizontally from the first interface 112 and extends to the second interface 113.
[0035] Among them, the internal circulation part 210 includes a vertical section 211 and a horizontal section 212. The vertical section 211 can lower the height of the circulation pipe 200 from the circulation introduction part 300 to the first interface 112, that is, the first interface 112 can be installed at a position lower than the circulation introduction part 300. For example, the first interface 112 can be installed at a position close to the second interface 113 according to actual layout requirements, so that the outer part of the circulation will not occupy too much space outside the fermentation tank 100, ensuring that the surface is neat and beautiful, and can also avoid other pipelines and equipment.
[0036] See also Figure 3 The external circulation portion 220 includes a first pipe section 221, a second pipe section 222 and a third pipe section 223. The first pipe section 221 extends horizontally outward from the first interface 112, the second pipe section 222 extends vertically downward from one end of the first pipe section 221 away from the first interface 112, and the third pipe section 223 extends horizontally from the second pipe section 222 to the second interface 113.
[0037] In some embodiments, see Figure 1 and Figure 2 The external circulation unit 220 is connected to a sludge filtrate pipe 500. The sludge filtrate pipe 500 allows different materials to be added to the fermentation tank 100 simultaneously through the feed port 111 and the sludge filtrate pipe 500. For example, food waste centrifuge can be added through the feed port 111 and sludge filtrate can be added through the sludge filtrate pipe 500 at the same time.
[0038] In addition, in order to avoid the sludge filtrate pipe 500 and the third pipe section 223 being connected to the second interface 113 at the same time, the sludge filtrate pipe 500 is connected to the third pipe section 223, so that the sludge filtrate and the circulating liquid both enter the fermentation tank 100 from the third pipe section 223.
[0039] In some embodiments, a thermometer (not shown) is installed in the circulation pipe 200 , and a heating pipeline 600 for heating the liquid to be treated in the circulation pipe 200 is connected in parallel to the circulation pipe 200 . A second circulation pump 640 is provided in the heating pipeline 600 .
[0040] The thermometer is used to monitor the temperature inside the fermenter 100 in real time. When the temperature inside the fermenter 100 is low, the second circulation pump 640 can pump the liquid to be treated in the circulation pipe 200 into the heating pipe 600 for heating, and then return the heated liquid to be treated to the circulation pipe 200 for circulation. This cycle continues in this manner, so that the temperature of the liquid to be treated inside the fermenter 100 and in the circulation pipe 200 remains within a preset temperature range to meet the temperature requirements for biogas production.
[0041] In some specific embodiments, see Figure 3 The heating pipeline 600 includes a liquid inlet pipe 610, a heater 630, and a liquid outlet pipe 620. The liquid inlet pipe 610 and the liquid outlet pipe 620 are respectively connected to different positions of the circulation pipe 200, and the heater 630 is provided at the connection position of the liquid inlet pipe 610 and the liquid outlet pipe 620. Specifically, the inlet of the liquid inlet pipe 610 is connected and communicated with the circulation pipe 200, the outlet of the liquid inlet pipe 610 is communicated with the inlet of the heater 630, the inlet of the liquid outlet pipe 620 is communicated with the outlet of the heater 630, and the outlet of the liquid outlet pipe 620 is communicated with the circulation pipe 200. The second circulation pump 640 is provided in the liquid inlet pipe 610.
[0042] When the thermometer detects that the temperature of the treated liquid in the circulation pipe 200 is low, it is fed back to the controller, and the controller controls the second circulation pump 640 to pump the treated liquid in the circulation pipe 200 to the liquid inlet pipe 610. The treated liquid entering the heater 630 from the liquid inlet pipe 610 is heated by the heater 630 and output to the liquid outlet pipe 620, and the heated treated liquid is transported to the circulation pipe 200 through the liquid outlet pipe 620.
[0043] The heater 630 may be a shell-and-tube heat exchanger.
[0044] In some embodiments, a pressure level gauge (not shown) is installed in the circulation pipe 200. The pressure level gauge is used to detect the liquid level in the fermenter 100 to prevent the liquid level from being too low. For example, when the pressure level gauge detects that the liquid level in the fermenter 100 is too low and has not yet reached the top height of the circulation introduction member 300, feedback is sent to the controller, and the controller controls the continued addition of the treated liquid to the fermenter 100 so that the liquid level in the fermenter 100 exceeds the circulation introduction member 300, so that the treated liquid can be introduced into the circulation pipe 200 through the circulation introduction member 300 for circulation.
[0045] Among them, the pressure level gauge is a device that uses the pressure exerted by the liquid on the sensor to measure the liquid level. You can choose the pressure level gauge commonly used on the market.
[0046] In some embodiments, see Figure 1 and Figure 2An overflow port 114 is provided on the side wall of the fermentation tank 100 at a position higher than the circulation introduction member 300. The overflow port 114 is used to overflow the liquid to be treated whose liquid level is higher than the overflow port 114 to the anaerobic buffer tank 700 or the biogas pool 800; the fermentation tank 100 also has a reflux port 115, which is connected to the anaerobic buffer tank 700.
[0047] During the process of adding the liquid to be treated to the fermentation tank 100, when the liquid level of the liquid to be treated is higher than the overflow port 114, the liquid to be treated can automatically flow out of the overflow port 114 and flow to the anaerobic buffer tank 700 or the biogas tank 800. When the anaerobic conditions in the liquid to be treated are good, the liquid to be treated can overflow into the anaerobic buffer tank 700 and be stored. When the anaerobic conditions in other fermentation tanks 100 are poor, the liquid to be treated in the anaerobic buffer tank 700 can be returned to the other fermentation tanks 100 through the reflux port 115 to adjust the anaerobic conditions in the other fermentation tanks 100. When the anaerobic conditions in the liquid to be treated are poor, the liquid to be treated can overflow directly into the biogas tank 800 to be anaerobic treated again next time.
[0048] For details, please refer to Figure 1 The fermentation tank 100 has a plurality of sampling ports 117 on its side for sampling. The materials in the fermentation tank 100 are tested through the sampling ports 117 to determine the degree of fermentation and the quality of the anaerobic conditions in the fermentation tank 100. In addition, the anaerobic conditions of the liquid to be treated can also be tested in the overflow channel of the overflow port 114.
[0049] In some embodiments, see Figure 2 A discharge assembly 900 is also provided near the top of the fermentation tank 100. This assembly is connected to the anaerobic buffer tank 700 or the biogas tank 800. Once the reaction in the fermentation tank 100 is complete, the biogas slurry can be transported to the anaerobic buffer tank 700 or the biogas tank 800 via the discharge assembly 900. Specifically, the biogas slurry can be transported to the anaerobic buffer tank 700 or the biogas tank 800 based on the anaerobic conditions of the biogas slurry.
[0050] In some embodiments, see Figure 2 The discharge assembly 900 includes a discharge pipe 910 and a discharge member 920. The third end of the discharge pipe 910 extends into the interior of the fermenter 100 and is higher than the circulation introduction member 300. The fourth end of the discharge pipe 910 extends out of the fermenter 100 to connect to the anaerobic buffer tank 700 or the biogas tank 800. The discharge member 920 is mounted on the third end of the discharge pipe 910. By extending the discharge pipe 910 into the interior of the fermenter 100 and higher than the circulation introduction member 300, the biogas slurry can be quickly introduced into the anaerobic buffer tank 700 or the biogas tank 800 after the reaction is completed or during the reaction.
[0051] In some embodiments, the circulation pipe 200 is installed with a pH meter, which is used to detect the pH value inside the fermentation tank 100. In order for the liquid to be treated to react with microorganisms to produce biogas, the pH value inside the fermentation tank 100 needs to meet certain requirements. In this embodiment, by setting the pH meter, the pH value inside the fermentation tank 100 can be detected in real time. When the pH value is too high, the excess biogas can be discharged to the anaerobic buffer tank 700 through the discharge component 900. When the pH value is too low, fresh material can be added to the fermentation tank 100 through the feed port 111 to adjust the pH value inside the fermentation tank 100 to ensure that the pH value inside the fermentation tank 100 is always within a preset range.
[0052] In some embodiments, see Figure 1 and Figure 2 The anaerobic fermentation device also includes a water pipe 1000, which includes a main body 1001 and multiple branches 1002. The main body 1001 extends from the second interface 113 to the inner wall of the fermentation tank 100 opposite to the second interface 113, and the branches 1002 are distributed in sequence along the length extension direction of the main body 1001.
[0053] The liquid to be treated that enters the fermentation tank 100 from the second interface 113 enters the main body 1001 and enters the inner cavity of the fermentation tank 100 through each branch 1002 in sequence. At the same time, since the branches 1002 are spaced apart in sequence along the length extension direction of the main body 1001, the liquid to be treated can be quickly and evenly added to the fermentation tank 100, so that the liquid to be treated in the fermentation tank 100 can fully contact the microorganisms, making the reaction more complete.
[0054] In some embodiments, a row of branches 1002 is distributed on one side of the main body 1001 .
[0055] In other embodiments, a row of branches 1002 is distributed on two opposite sides of the main body 1001 along the horizontal direction.
[0056] In some other embodiments, the main body 1001 has multiple rows of branches 1002 evenly distributed along the circumference.
[0057] In some embodiments, see Figure 1 and Figure 2 The bottom of the fermentation tank 100 has a guide surface 116, which extends downwardly from the inner periphery of the fermentation tank 100 toward the bottom center of the fermentation tank 100. The bottom center of the fermentation tank 100 is connected to the sand drainage pool 1200 via the sand drainage pipe 1100. In this embodiment, by providing the guide surface 116 on the bottom of the fermentation tank 100, the sediment can be guided along the guide surface 116 to the bottom center of the fermentation tank 100, and then discharged into the sand drainage pool 1200 through the sand drainage pipe 1100.
[0058] Optionally, the guide surface 116 is a conical surface or an inner concave arc surface or an outer convex arc surface.
[0059] In some embodiments, referring to Figure 1 and Figure 2 , the fermentation tank 100 comprises a tank body 110 and a water seal structure 120 arranged on the top of the tank body 110, and a biogas outlet 121 arranged on the water seal structure 120. The water seal structure 120 is used to seal the fermentation tank 100 to prevent biogas leakage, and also to realize gas-liquid separation of the biogas so that the biogas is more pure. The water seal structure 120 can realize gas-liquid separation by different gas-liquid sealing distances, or a screen or other structure can be arranged in the water seal structure 120 to realize gas-liquid separation.
[0060] In some embodiments, referring to Figure 1 , the biogas outlet 121 is connected to a biogas tank 1400 through a biogas pipe 1300. The biogas pipe 1300 has at least one reserved interface, and the biogas is connected out of the biogas pipe 1300 through the reserved interface to realize sampling and detection of the biogas.
[0061] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An anaerobic fermentation device, characterized in that: It includes a fermentation tank, a circulation pipe and a circulation introduction piece; the fermentation tank has a feed port arranged near its bottom and used for adding the liquid to be treated into the fermentation tank, and a biogas outlet for discharging biogas; the fermentation tank also has a first interface and a second interface, the first end of the circulation pipe is connected to the second interface outside the fermentation tank, the circulation pipe is arranged through the first interface, the second end of the circulation pipe is inserted from the first interface into the inner center of the fermentation tank and close to the top, the circulation introduction piece is connected to the second end of the circulation pipe, and the opening of the circulation introduction piece faces upward to introduce the liquid to be treated into the circulation pipe; a first circulation pump is provided in the circulation pipe.
2. The anaerobic fermentation device according to claim 1, wherein The inner diameter of the circulation introduction part gradually decreases from the top to the bottom.
3. The anaerobic fermentation device according to claim 1, wherein The circulation pipe includes an inner circulation portion and an outer circulation portion; the inner circulation portion includes a vertical section and a horizontal section, the vertical section extends vertically downward from the circulation introduction member, and the horizontal section extends horizontally from the vertical section to the first interface; The outer circulation portion extends from the first interface through vertical bending and horizontal bending to the second interface; The external circulation part is connected with a sludge filtrate pipe.
4. The anaerobic fermentation device according to claim 1, wherein A thermometer is installed in the circulation pipe, and a heating pipeline for heating the liquid to be treated in the circulation pipe is connected in parallel to the circulation pipe. A second circulation pump is provided in the heating pipeline.
5. The anaerobic fermentation device according to any one of claims 1 to 4, characterized in that: A pressure level gauge is installed in the circulation pipe, and the pressure level gauge is used to detect the liquid level in the fermentation tank to prevent the liquid level from being too low.
6. The anaerobic fermentation device according to any one of claims 1 to 4, characterized in that: An overflow port is provided on the side wall of the fermentation tank at a position higher than the circulation introduction member, and the overflow port is used to overflow the liquid to be treated whose liquid level is higher than the overflow port into the anaerobic buffer tank or the biogas tank; The fermentation tank further comprises a reflux port, which is connected to the anaerobic buffer tank.
7. The anaerobic fermentation device according to claim 6, characterized in that: The fermentation tank is further provided with a discharge assembly near the top, and the discharge assembly is connected to the anaerobic buffer tank or the biogas pool.
8. The anaerobic fermentation device according to claim 7, characterized in that: The discharge assembly includes a discharge pipe and a discharge piece. The third end of the discharge pipe extends into the interior of the fermentation tank and is higher than the circulation introduction piece. The fourth end of the discharge pipe extends out of the fermentation tank to be connected to the anaerobic buffer tank or the sludge pool. The discharge piece is installed at the third end of the discharge pipe.
9. The anaerobic fermentation device according to any one of claims 1 to 4, characterized in that: The anaerobic fermentation device also includes a water pipe, which includes a main body and multiple branches. The main body extends from the second interface to the inner wall of the fermentation tank opposite to the second interface, and the branches are distributed in sequence along the length extension direction of the main body.
10. The anaerobic fermentation device according to any one of claims 1 to 4, characterized in that: The bottom of the fermenter has a guide surface, which extends downwardly from the inner periphery of the fermenter to the bottom center of the fermenter. The bottom center of the fermenter is connected to the sand discharge pool through a sand discharge pipe.