Urban organic solid waste anaerobic fermentation stirring device capable of being maintained on line

Abstract

The utility model provides an urban organic solid waste anaerobic fermentation stirring device capable of being maintained on line, which comprises an anaerobic fermentation tank and is characterized in that a plurality of groups of circumferential circulating stirring devices are arranged at the lower part of the outer edge of the anaerobic fermentation tank in the circumferential direction; a plurality of groups of axial circulating stirring devices are arranged at the middle part and the upper part of the outer edge of the anaerobic fermentation tank, the circumferential circulating stirring devices and the axial circulating stirring devices are communicated with the interior of the anaerobic fermentation tank, and a feeding pipeline communicated with the circumferential circulating stirring devices is also arranged on the outer side of the anaerobic fermentation tank; through a stirring working mode of combining the axial circulating stirring device and the circumferential circulating stirring device, efficient homogeneous mixing of materials in the anaerobic fermentation tank in the horizontal circumferential direction and the vertical axial direction is realized.

Description

Technical Field

[0001] This utility model relates to the technical field of organic solid waste treatment devices, specifically to an anaerobic fermentation stirring device for urban organic solid waste that can be maintained online. Background Technology

[0002] Organic solid waste in my country mainly originates from domestic sources (kitchen waste, food waste, municipal sludge, etc.), agricultural sources (agricultural straw, livestock and poultry manure), and industrial sources (mushroom residue, distiller's grains, vinegar residue, etc.). It is not only produced in large quantities but also affects a wide range of industries. Organic solid waste possesses both pollutant and resource attributes; improper treatment and utilization will lead to serious environmental pollution and resource waste. Anaerobic digestion has become an important means of steadily reducing organic solid waste and recovering biomass energy.

[0003] Anaerobic digestion is a core process in the treatment of organic solid waste. Its treatment efficiency directly affects the material recovery and energy conversion efficiency of the anaerobic system. Among them, anaerobic stirring is an important means to achieve efficient mixing of microorganisms and organic matter, which directly affects the biogas production efficiency of anaerobic digestion.

[0004] Currently, the mixing methods in anaerobic digesters are mainly divided into mechanical mixing, hydraulic mixing, biogas mixing, or a combination of these methods. Among them, mechanical mixing, including vertical mixers and through-wall mixers, is the main mixing method used in anaerobic digestion. However, traditional mechanical mixing also has problems such as easy wear, difficult maintenance, local overload and "dead zones" in the mixing area, and high energy consumption. In particular, the problems are more prominent in anaerobic digesters that use through-wall mixers as the main mixer. The mixer blades wear frequently, the maintenance frequency is high, the service life is short, the mechanical seal is easily damaged, and maintenance requires cleaning the tank and loading and unloading the mixing device, which causes great trouble to the normal operation of the anaerobic digester.

[0005] Therefore, there is an urgent need to provide a new solution to address the defects and shortcomings of the existing technologies. Utility Model Content

[0006] In order to overcome the defects and shortcomings of the existing technology, this utility model provides an anaerobic fermentation stirring device for urban organic solid waste that can be maintained online.

[0007] The technical solution provided by this utility model is as follows:

[0008] An online-maintainable anaerobic fermentation mixing device for urban organic solid waste includes an anaerobic fermentation tank. The device is characterized by having several sets of circumferentially circulating mixing devices arranged in the lower circumferential direction of the outer edge of the anaerobic fermentation tank, and several sets of axially circulating mixing devices arranged in the middle and upper parts of the outer edge of the anaerobic fermentation tank. Both the circumferential and axially circulating mixing devices are connected to the interior of the anaerobic fermentation tank. A feed pipe connected to the circumferentially circulating mixing devices is also provided on the outside of the anaerobic fermentation tank.

[0009] As a further preferred embodiment of the present invention, the circumferential circulating stirring device is provided in two sets, and the two sets of circumferential circulating stirring devices are arranged at a first included angle on the outer edge of the anaerobic fermenter.

[0010] As a further preferred embodiment of the present invention, the circumferential circulating stirring device includes a circumferential circulating pump, the feed end of which is connected to a guide tube formed on the inner wall of the anaerobic fermenter via a feed pipe; the discharge end of the circumferential circulating pump extends into the interior of the anaerobic fermenter via a discharge pipe, and one end of the discharge pipe extending into the interior of the anaerobic fermenter is connected to a circumferential jet assembly.

[0011] As a further preferred embodiment of this utility model, a feed control valve and a feed vibration damping unit are respectively connected to the feed pipe.

[0012] As a further preferred embodiment of the present invention, the discharge pipe includes a first discharge pipe and a second discharge pipe connected to each other, and the first discharge pipe and the second discharge pipe are arranged at a second included angle.

[0013] As a further preferred embodiment of this utility model, a discharge control valve is provided on the second discharge pipe.

[0014] As a further preferred embodiment of the present invention, the axial circulation stirring device includes an axial circulation pump, the discharge end of the axial circulation pump extending into the interior of the anaerobic fermenter through a first discharge pipe and a second discharge pipe, and the ends of the first discharge pipe and the second discharge pipe extending into the interior of the anaerobic fermenter are respectively connected to a first axial jet component and a second axial jet component.

[0015] As a further preferred embodiment of the present invention, the top end of the first discharge pipe is lower than the top end of the second discharge pipe, the position of the first axial jet assembly is lower than the position of the second axial jet assembly, the position of the second axial jet assembly is lower than the liquid level in the anaerobic fermenter, and discharge control valves are respectively connected to the first discharge pipe and the second discharge pipe.

[0016] As a further preferred embodiment of the present invention, the circumferential jet assembly, the first axial jet assembly and the second axial jet assembly each include a nozzle portion, a connecting portion and an outer expansion portion connected in sequence, the connecting portion being located between the nozzle portion and the outer expansion portion, and the outer expansion portion being away from the inner wall of the anaerobic fermenter.

[0017] As a further preferred embodiment of the present invention, the feed pipe includes a material input pipe connected to the guide cylinder, and the material input pipe is connected to the sludge input pipe and the kitchen waste input pipe respectively.

[0018] The beneficial effects of this utility model compared to the prior art include:

[0019] 1) This utility model provides an online-maintainable anaerobic fermentation mixing device for urban organic solid waste. Addressing the problems and shortcomings of existing through-wall mechanical mixers, it achieves efficient and homogeneous mixing of materials inside the anaerobic fermentation tank in both the horizontal circumferential direction and the vertical axial direction by combining an axial circulation mixing device and a circumferential circulation mixing device. This solves the problems of high maintenance frequency and short service life of the mixer, and improves the degradation efficiency and biogas production efficiency of the materials in the anaerobic tank.

[0020] 2) This utility model provides an online-maintainable anaerobic fermentation mixing device for urban organic solid waste. It replaces the mixing device inside the tank with an axial circulation mixing device and a circumferential circulation mixing device set outside the anaerobic fermentation tank. Since there are two sets of circumferential circulation mixing devices and the axial circulation mixing devices are set at different heights, the other set of mixing devices can be maintained online while one set of mixing devices is working, which facilitates maintenance and ensures mixing efficiency.

[0021] 3) This utility model provides an online-maintainable anaerobic fermentation mixing device for urban organic solid waste. By setting the axial circulation mixing device at different heights in the middle and upper parts of the tank, and the first axial jet component and the second axial jet component being located below the liquid level of the material inside the anaerobic fermentation tank, the high-speed fluid ejected by the jet component can break up the scum on the top of the anaerobic fermentation tank, thereby significantly improving the stability of the anaerobic tank operation and the gas production efficiency, further ensuring uniform mixing of materials and improving mixing efficiency. Attached Figure Description

[0022] Figure 1 A top view of the structure of the stirring device provided by this utility model.

[0023] Figure 2 An enlarged view of the circumferential circulating stirring device provided by this utility model.

[0024] Figure 3 This is an enlarged view of the jet assembly provided by this utility model.

[0025] Figure 4 This is a schematic diagram of the axial circulation stirring device provided by this utility model.

[0026] Figure 5 A schematic diagram of the feed pipe provided by this utility model.

[0027] The markings in this utility model are explained as follows:

[0028] 100-Anaerobic Fermenter;

[0029] 200 - Circumferential circulating stirring device; 201 - Circumferential circulating pump; 202 - Feed pipe; 2021 - Feed control valve; 2022 - Feed vibration damping part; 203 - Guide cylinder; 204 - Discharge pipe; 204A - First discharge pipe; 204B - Second discharge pipe; 2041 - Discharge control valve; 205 - Circumferential jet assembly; 2051 - Nozzle part; 2052 - Connecting part; 2053 - Outward expansion part;

[0030] 300 - Axial circulation stirring device, 301 - Axial circulation pump, 302A - First discharge pipe, 302B - Second discharge pipe, 3021 - Discharge control valve, 303A - First axial jet assembly, 303B - Second axial jet assembly;

[0031] 400 - Feed pipe, 401 - Material input pipe, 402 - Sludge input pipe, 403 - Kitchen waste input pipe. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] [First Embodiment]

[0036] like Figure 1-5 The image shows an online-maintainable anaerobic fermentation stirring device for urban organic solid waste, as provided in the first embodiment of this utility model. It includes an anaerobic fermentation tank 100. In this embodiment, the anaerobic fermentation tank 100 has a volume of 3000 m³, and the solid content of the internal material is 8%~15%. Several sets of circumferential circulating stirring devices 200 are arranged in the lower circumferential direction of the outer edge of the anaerobic fermentation tank 100, and several sets of axial circulating stirring devices 300 are arranged in the middle and upper positions of the outer edge of the anaerobic fermentation tank 100. Both the circumferential and axial circulating stirring devices 200 are connected to the interior of the anaerobic fermentation tank 100. The outer side of the anaerobic fermentation tank 100 is also provided with... The circulating stirring device 200 is connected to the feed pipe 400. Addressing the problems and shortcomings of existing through-wall mechanical mixers, this system combines axial and circumferential circulating stirring devices to achieve efficient and homogeneous mixing of materials inside the anaerobic digester in both the horizontal circumferential direction and the vertical axial direction. This solves the problems of high maintenance frequency and short service life associated with traditional mixers, improving the degradation efficiency and biogas production efficiency of materials in the anaerobic digester. Furthermore, by replacing the internal stirring device with the external axial and circumferential circulating stirring devices, online maintenance of the stirring devices is possible, facilitating inspection while ensuring mixing efficiency.

[0037] The circumferential circulating stirring device 200 achieves rapid circumferential spiral mixing of old materials and old materials with fresh materials in the horizontal direction inside the anaerobic fermenter 100; the axial circulating stirring device 300 lifts the bottom material to the top of the anaerobic fermenter 100, achieving vertical mixing of materials in the anaerobic fermenter 100. Through the cooperation of the two circulating stirring methods, the materials inside the anaerobic fermenter 100 are fully stirred and mixed.

[0038] like Figure 1 As shown, the circumferential circulating stirring device 200 in this embodiment is provided with two sets, for example... Figure 1The first circumferential circulating stirring device 200A and the second circumferential circulating stirring device 200B shown are arranged at a first included angle on the outer edge of the anaerobic fermenter 100. In this embodiment, the first included angle is set to 140°. The circumferential circulating stirring device 200 achieves a rapid circumferential spiral mixing process in the horizontal direction between old materials inside the anaerobic fermenter 100 and between old materials and fresh materials inside the anaerobic fermenter 100.

[0039] like Figure 2 As shown, the circumferential circulating stirring device 200 in this embodiment includes a circumferential circulating pump 201. The feed end of the circumferential circulating pump 201 is connected to a guide tube 203 formed on the inner wall of the anaerobic fermenter 100 via a feed pipe 202. The discharge end of the circumferential circulating pump 201 extends into the interior of the anaerobic fermenter 100 via a discharge pipe 204, and one end of the discharge pipe extending into the interior of the anaerobic fermenter 100 is connected to a circumferential jet assembly 205. After the material inside the anaerobic fermenter 100 enters the interior of the guide tube 203, it sinks to the lower part of the guide tube 203 due to its own gravity. After passing through the feed pipe 202, it is sprayed out from the circumferential jet assembly 205 through the discharge pipe 204 via the discharge end of the circumferential circulating pump 201, thus realizing the rapid mixing of fresh material with the material in the tank.

[0040] like Figure 1 As shown, preferably, in this embodiment, the outlet pipe 204 of the circumferential circulation pump 201 is positioned at a 20° angle to the inlet pipe 202, and the circumferential jet assembly 205 is positioned at a 30° angle to the radial direction of the anaerobic digester 100. This arrangement ensures that when the circumferential circulation pump jets, the material is ejected counterclockwise, and the high-speed liquid flow creates a local negative pressure environment around it, adsorbing and driving the liquid flow to accelerate mixing. This, in turn, drives the material in the anaerobic digester 100 to rotate counterclockwise, achieving circumferential spiral stirring and homogeneous mixing of the material. The combination of the two circumferential jet assemblies 205 forms a horizontal circumferential spiral stirring motion, enabling uniform mixing of the material in the horizontal direction. Those skilled in the art can also configure more sets of circumferential jet assemblies 205 and corresponding angles according to the actual stirring needs.

[0041] Preferably, a feed control valve 2021 and a feed vibration damping unit 2022 are connected to the feed pipe 202. The feed control valve 2021 regulates the flow rate and controls the opening and closing of the feed pipe 202, while the feed vibration damping unit 2022 reduces the expected vibrations caused during the feeding process, ensuring stability. The discharge pipe 204 includes a first discharge pipe 204A and a second discharge pipe 204B connected to each other, with the first discharge pipe 204A and the second discharge pipe 204B forming a second included angle. In this embodiment, the second included angle is set to 120°. This second included angle allows the circulatory pump to enter from one side of the anaerobic digester 100, thereby driving the material inside the tank to rotate counterclockwise. A discharge control valve 2041 is provided on the second discharge pipe 204B to regulate the flow rate and control the opening and closing of the discharge pipe 204.

[0042] like Figure 4 As shown, the axial circulation stirring device 300 in this embodiment includes an axial circulation pump 301. The discharge end of the axial circulation pump 301 extends into the interior of the anaerobic digester 100 via a first discharge pipe 302A and a second discharge pipe 302B, respectively. A first axial jet assembly 303A and a second axial jet assembly 303B are respectively connected to one end of the first discharge pipe 302A and the second discharge pipe 302B that extends into the interior of the anaerobic digester 100. The vertical circulation stirring device 300 achieves vertical mixing of the material inside the anaerobic digester 100 by lifting the bottom material to the top of the interior of the anaerobic digester 100. Preferably, as... Figure 1 As shown, in this embodiment, the axial circulating stirring device 300 can be set at 90° with the first circumferential circulating stirring device 200A.

[0043] In this embodiment, the top of the first discharge pipe 302A is lower than the top of the second discharge pipe 302B, the position of the first axial jet assembly 303A is lower than the position of the second axial jet assembly 303B, and the position of the second axial jet assembly 303B is lower than the liquid level inside the anaerobic digester 100. By positioning the first and second axial jet assemblies below the liquid level inside the anaerobic digester, the high-speed jetting fluid can break up the scum on the top of the anaerobic digester, significantly improving the stability and gas production efficiency of the anaerobic digester, further ensuring uniform material mixing, and improving mixing efficiency. Discharge control valves 3021 are connected to the first discharge pipe 302A and the second discharge pipe 302B respectively to regulate the flow rate and control the opening and closing of the first discharge pipe 302A and the second discharge pipe 302B.

[0044] As a further preferred option, the height difference between the first axial jet assembly and the second axial jet assembly can be determined based on factors such as the properties and solids content of the fermentation material inside the anaerobic digester 100. Typically, the position of the first axial jet assembly 303A is set to be 2-5m below the second axial jet assembly 303B.

[0045] like Figure 3 As shown, in this embodiment, the circumferential jet assembly 205, the first axial jet assembly 303A, and the second axial jet assembly 303B each include a nozzle portion 2051, a connecting portion 2052, and an outer expansion portion 2053 connected in sequence. The connecting portion 2052 is located between the nozzle portion 2051 and the outer expansion portion 2053. The outer expansion portion 2053 is away from the inner wall of the anaerobic digester 100. The nozzle portion 2051 is used to connect to the discharge pipe or the discharge pipe. After passing through the connecting portion 2052, the material is sprayed into the anaerobic digester 100 from the outer expansion portion 2053.

[0046] like Figure 5 As shown, the feed pipe 400 in this embodiment includes a material input pipe 401 connected to the guide cylinder 203. The material input pipe 401 is connected to the sludge input pipe 402 and the kitchen waste input pipe 403 respectively. Under the drive of the corresponding drive pump, sludge can be sent into the material input pipe 401 through the sludge input pipe 402, and kitchen waste can be sent into the material input pipe 401 through the kitchen waste input pipe 403. The sludge and kitchen waste are sent into the guide cylinder 203 as fresh material through the material input pipe 401. Under its own gravity, the fresh material falls into the lower part of the anaerobic digester 100 in the guide cylinder 203. While being fully mixed with the material by the circumferential circulation stirring device, it is sent into the middle and upper parts of the anaerobic digester 100 from bottom to top by the axial circulation stirring device, and then enters the upper part of the guide cylinder 203 as old material to mix with the fresh material to achieve stirring and circulation.

[0047] This embodiment provides an online-maintainable anaerobic fermentation mixing device for urban organic solid waste. A circumferential circulating mixing device 200 achieves rapid horizontal spiral mixing between old materials and between old and fresh materials within the anaerobic fermentation tank 100. An axial circulating mixing device 300 lifts materials from the bottom of the anaerobic fermentation tank 100 to the top, achieving vertical mixing of materials within the tank. Through the cooperation of these two circulating mixing methods, thorough mixing of the materials inside the anaerobic fermentation tank 100 is achieved.

[0048] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An online-maintainable anaerobic fermentation mixing device for urban organic solid waste, comprising an anaerobic fermentation tank (100), characterized in that: Several sets of circumferential circulating stirring devices (200) are arranged in the lower circumferential direction of the outer edge of the anaerobic fermenter (100), and several sets of axial circulating stirring devices (300) are arranged in the middle and upper positions of the outer edge of the anaerobic fermenter (100). The circumferential circulating stirring devices (200) and the axial circulating stirring devices (300) are both connected to the interior of the anaerobic fermenter (100). A feed pipe (400) connected to the circumferential circulating stirring devices (200) is also provided on the outside of the anaerobic fermenter (100).

2. The online-maintainable anaerobic fermentation mixing device for urban organic solid waste according to claim 1, characterized in that: Two sets of circumferential circulating stirring devices (200) are provided, and the two sets of circumferential circulating stirring devices (200) are arranged at a first included angle on the outer edge of the anaerobic fermenter (100).

3. The online-maintainable anaerobic fermentation mixing device for urban organic solid waste according to claim 1, characterized in that: The circumferential circulating stirring device (200) includes a circumferential circulating pump (201). The feed end of the circumferential circulating pump (201) is connected to a guide tube (203) opened on the inner wall of the anaerobic fermenter (100) via a feed pipe (202). The discharge end of the circumferential circulating pump (201) extends into the interior of the anaerobic fermenter (100) via a discharge pipe (204), and one end of the discharge pipe extending into the interior of the anaerobic fermenter (100) is connected to a circumferential jet assembly (205).

4. The online-maintainable anaerobic fermentation mixing device for urban organic solid waste according to claim 3, characterized in that: The feed pipe (202) is connected to a feed control valve (2021) and a feed damping unit (2022).

5. The online-maintainable anaerobic fermentation mixing device for urban organic solid waste according to claim 3, characterized in that: The discharge pipe (204) includes a first discharge pipe (204A) and a second discharge pipe (204B) connected to each other, and the first discharge pipe (204A) and the second discharge pipe (204B) are arranged at a second included angle.

6. The online-maintainable anaerobic fermentation mixing device for urban organic solid waste according to claim 5, characterized in that: The second discharge pipe (204B) is equipped with a discharge control valve (2041).

7. The online-maintainable anaerobic fermentation mixing device for urban organic solid waste according to claim 3, characterized in that: The axial circulation stirring device (300) includes an axial circulation pump (301). The discharge end of the axial circulation pump (301) extends into the interior of the anaerobic fermenter (100) through a first discharge pipe (302A) and a second discharge pipe (302B). The ends of the first discharge pipe (302A) and the second discharge pipe (302B) that extend into the interior of the anaerobic fermenter (100) are respectively connected to a first axial jet assembly (303A) and a second axial jet assembly (303B).

8. The online-maintainable anaerobic fermentation stirring device for urban organic solid waste according to claim 7, characterized in that: The top end of the first discharge pipe (302A) is lower than the top end of the second discharge pipe (302B), the position of the first axial jet assembly (303A) is lower than the position of the second axial jet assembly (303B), the position of the second axial jet assembly (303B) is lower than the liquid level in the anaerobic fermenter (100), and discharge control valves (3021) are respectively connected to the first discharge pipe (302A) and the second discharge pipe (302B).

9. The online-maintainable anaerobic fermentation stirring device for urban organic solid waste according to claim 7, characterized in that: The circumferential jet assembly (205), the first axial jet assembly (303A), and the second axial jet assembly (303B) each include a nozzle portion (2051), a connecting portion (2052), and an outer expansion portion (2053) connected in sequence. The connecting portion (2052) is located between the nozzle portion (2051) and the outer expansion portion (2053), and the outer expansion portion (2053) is away from the inner wall of the anaerobic fermenter (100).

10. The online-maintainable anaerobic fermentation mixing device for urban organic solid waste according to claim 3, characterized in that: The feed pipe (400) includes a material input pipe (401) connected to the guide tube (203), and the material input pipe (401) is connected to the sludge input pipe (402) and the kitchen waste input pipe (403) respectively.

Images