A reaction tank for sludge anaerobic fermentation

Abstract

The utility model provides a kind of for sludge anaerobic fermentation's reaction tank, belong to sludge fermentation technical field, including jar body, the outside of jar body is close to the side of top and is provided with support piece, the outside of jar body is also provided with side platform, control cabinet is installed on side platform, the side of top of jar body is provided with inlet, its bottom is provided with discharge port, discharge port is provided with solenoid valve, the axis of jar body is provided with stirring subassembly, the inside of jar body is provided with flora replenishing pipe group, flora replenishing pipe group extends to the top of jar body, the inside of jar body is provided with temperature control module, the top of jar body is also provided with pressure relief component, control cabinet is electrically connected with solenoid valve, stirring subassembly, temperature control module and pressure relief component respectively, solve the structure of existing large volume reaction tank Simple, poor flowability of material in jar, sludge and microbial flora are not mixed sufficiently, thereby make fermentation efficiency reduce, the problem of finally affecting the quality and yield of product biogas.

Description

Technical Field

[0001] This utility model relates to the field of sludge fermentation technology, and more specifically, to a reaction vessel for anaerobic fermentation of sludge. Background Technology

[0002] With the acceleration of urbanization, the volume of sewage treated has been increasing year by year. Sludge, as a byproduct of water treatment, contains a large amount of organic matter, which can easily cause secondary pollution if not properly disposed of. Anaerobic fermentation technology, through the synergistic effect of facultative and anaerobic bacteria under anaerobic conditions, can convert the organic matter in sludge into clean energy such as methane, while achieving volume reduction and harmless treatment. It has become one of the core technologies for the resource utilization of sludge.

[0003] Existing anaerobic sludge fermentation devices mostly employ a simple, closed tank design, relying on an external temperature control system to maintain fermentation temperature and a pressure relief valve to regulate the pressure inside the tank. While these devices can achieve basic fermentation functions, when dealing with large-volume reactors, the fluidity of the material inside the tank decreases, leading to insufficient mixing of sludge and microbial communities, resulting in localized temperature gradients and differences in fermentation cycles. This unevenness directly reduces fermentation efficiency and easily triggers short-circuiting, causing some areas to ferment incompletely due to insufficient residence time, ultimately affecting the quality and yield of the biogas product. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a reaction tank for anaerobic fermentation of sludge, which solves the aforementioned problems.

[0005] This utility model is implemented as follows: A reaction vessel for anaerobic fermentation of sludge includes a tank body, a support member on the outer side near the top of the tank body, a side platform on the outer side of the tank body, a control box mounted on the side platform, an inlet on the top side of the tank body, an outlet at the bottom of the tank body, a solenoid valve at the outlet, a stirring assembly at the axis of the tank body, a microbial replenishment pipe assembly inside the tank body extending to the top of the tank body, a temperature control module inside the tank body, and a pressure relief assembly at the top of the tank body. The control box is electrically connected to the solenoid valve, the stirring assembly, the temperature control module, and the pressure relief assembly.

[0006] In an embodiment of this utility model, the control box includes an LCD touch screen and a PLC controller.

[0007] In an embodiment of this utility model, the stirring assembly includes a stirring motor disposed on the top of the tank. A first fixing frame and a second fixing frame are disposed from top to bottom on the inner side wall of the tank. A shaft is disposed between the first fixing frame and the second fixing frame. The output shaft of the stirring motor passes through the top of the tank and is connected to the shaft. Two first blades and one second blade are disposed on the shaft.

[0008] In an embodiment of this utility model, one of the first blades is disposed on the side near the middle of the tank, and the other is disposed below it, while the second blade is disposed on the side of the tank near the bottom.

[0009] In an embodiment of this utility model, the center of the first fixing frame is a circular ring structure, and a connecting arm is fixedly provided between the outer side of the circular ring and the side wall of the tank. A first limiting piece is provided on the outer side of the shaft to contact the upper part of the circular ring. The center of the second fixing frame is a second circular ring, and a second connecting arm is fixedly provided between the outer side of the second circular ring and the side wall of the tank. A second limiting piece is provided on the outer side of the shaft to contact the upper part of the second circular ring.

[0010] In an embodiment of this utility model, the microbial replenishment tube assembly includes a first replenishment tube, a second replenishment tube, and a third replenishment tube. The first replenishment tube is disposed on the side of the tank near the top, and a first connector for fixing the first replenishment tube is welded to the top of the tank. The second replenishment tube is disposed on the side of the tank near the middle, and a second connector for fixing the second replenishment tube is welded to the side wall of the tank. The third replenishment tube is disposed on the side of the tank near the bottom, and a third connector for fixing the third replenishment tube is welded to the side wall of the tank. The inlets of the three replenishment tubes penetrate the tank to its top, and a sealing cap is threadedly connected to the tube opening.

[0011] In an embodiment of this utility model, the bottoms of the first replenishment tube, the second replenishment tube, and the third replenishment tube are provided with drip holes that are circumferentially separated.

[0012] In an embodiment of this utility model, the temperature control module includes a heating coil and a temperature controller disposed on the inner side wall of the tank.

[0013] In an embodiment of this utility model, there are three sets of temperature control modules, which are arranged linearly and equally from the bottom of the tank, and the installation height of the uppermost temperature control module is lower than the preset maximum sludge injection elevation of the tank.

[0014] In an embodiment of this utility model, the pressure relief assembly includes a pressure relief valve, one end of which is connected to the tank body and the other end is connected to an external gas collection device. A flow meter is provided on one side of the pressure relief valve.

[0015] The beneficial effects of this invention are as follows: This reactor achieves efficient anaerobic fermentation through a multi-dimensional collaborative control system. A three-stage stirring blade system is set at the center of the tank body. The first blade at the top enhances the mixing of surface materials, the second blade in the middle breaks the layering interface, and the third blade at the bottom promotes the circulation of settled sludge, forming a three-dimensional flow field. The layered microbial replenishment pipe group achieves gradient addition of microbial agents through a drip hole structure. Combined with the eddy current generated by stirring, it achieves rapid and uniform distribution of microorganisms. Three sets of temperature control modules are linearly distributed along the height of the tank body. The heating coil and temperature sensor are linked to form a zoned temperature control system. Combined with the forced convection generated by stirring, it effectively eliminates the radial temperature gradient. The pressure relief component integrates a flow meter and a gas collection device to monitor the gas production in real time and feed it back to the PLC control system, forming a closed-loop control of the fermentation process. Compared to traditional simple tanks, the three-stage impeller constructs a three-layer mixing system, which improves the sludge retention time distribution and eliminates short-circuiting. The layered addition of microbial agents, combined with forced stirring, improves the microbial contact efficiency and increases the degradation rate of organic matter. The three-stage heating module, combined with stirring and convection, reduces the axial temperature difference. At the same time, the process model is built through the accumulation of flow data, providing data support for subsequent modifications. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a reaction tank for anaerobic fermentation of sludge provided for an embodiment of this utility model; Figure 2 A cross-sectional view of a reaction vessel for anaerobic fermentation of sludge provided for an embodiment of this utility model; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view of point B in the middle; Figure 5 for Figure 2 Enlarged view of point C in the middle; Figure 6 A communication block diagram provided for embodiments of this utility model.

[0018] In the diagram: 10. Tank body; 11. Inlet; 12. Outlet; 13. Solenoid valve; 14. Support component; 15. Side platform; 16. Control box; 20. Microbial replenishment pipe assembly; 21. First replenishment pipe; 22. Second replenishment pipe; 23. Third replenishment pipe; 30. Stirring assembly; 31. Stirring motor; 32. Shaft; 33. First impeller; 34. Second impeller; 35. First fixing frame; 36. Second fixing frame; 40. Temperature control module; 41. Heating coil; 42. Temperature sensor; 50. Pressure relief assembly; 51. Pressure relief valve; 52. Flow meter. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] like Figure 1-2 and Figure 6 As shown, this utility model provides a reaction vessel for anaerobic fermentation of sludge, including a tank body 10. A support member 14 is provided on the outer side of the tank body 10 near the top, and the support member 14 is connected to the external scaffolding to fix the device. A side platform 15 is also provided on the outer side of the tank body 10, and a control box 16 is installed on the side platform 15. An inlet 11 is provided on the top side of the tank body 10, and a outlet 12 is provided at the bottom. A solenoid valve 13 is provided at the outlet 12, which is used to control the discharge of sludge after the subsequent reaction is completed. A stirring assembly 30 is provided at the axis of the tank body 10. A microbial replenishment pipe assembly 20 is provided inside the tank body 10, and the microbial replenishment pipe assembly 20 extends to the top of the tank body 10. A temperature control module 40 is provided inside the tank body 10, and a pressure relief assembly 50 is provided at the top of the tank body 10. The control box 16 is electrically connected to the solenoid valve 13, the stirring assembly 30, the temperature control module 40, and the pressure relief assembly 50.

[0022] In this embodiment, the control box 16 includes an LCD touch screen and a PLC controller.

[0023] like Figure 2 , Figure 4 and Figure 5 As shown, the stirring assembly 30 includes a stirring motor 31 mounted on the top of the tank 10. A first fixing frame 35 and a second fixing frame 36 are mounted on the inner side wall of the tank 10 from top to bottom. A shaft 32 is mounted between the first fixing frame 35 and the second fixing frame 36. The output shaft of the stirring motor 31 passes through the top of the tank 10 and is connected to the shaft 32. Two first blades 33 and one second blade 34 are mounted on the shaft 32. One of the first blades 33 is located near the middle of the tank 10, and the other is located below it. The second blade 34 is located near the bottom of the tank 10. The three blades mix and stir different areas inside the tank 10, thereby avoiding the problem of uneven mixing in certain areas.

[0024] Furthermore, the center of the first fixing frame 35 is a circular ring structure, and a connecting arm is fixedly provided between the outer side of the ring and the side wall of the tank 10. The outer side of the shaft 32 is provided with a first limiting piece that contacts the top of the ring. The center of the second fixing frame 36 is a second ring, and the outer side of the second ring is fixedly provided between the side wall of the tank 10. The outer side of the shaft 32 is provided with a second limiting piece that contacts the top of the second ring. That is, the stability of the stirring assembly 30 is achieved through the two fixing frames.

[0025] like Figure 2-5 As shown, the microbial replenishment tube group 20 includes a first replenishment tube 21, a second replenishment tube 22, and a third replenishment tube 23. The first replenishment tube 21 is located on the side of the tank 10 near the top, and a first connector for fixing the first replenishment tube 21 is welded to the top of the tank 10. The second replenishment tube 22 is located on the side of the tank 10 near the middle, and a second connector for fixing the second replenishment tube 22 is welded to the side wall of the tank 10. The third replenishment tube 23 is located on the side of the tank 10 near the bottom, and a third connector for fixing the third replenishment tube 23 is welded to the side wall of the tank 10. The inlets of the three replenishment tubes penetrate the tank 10 to its top, and a sealing cap is threaded to the tube opening. The bottoms of the first replenishment tube 21, the second replenishment tube 22, and the third replenishment tube 23 are circumferentially separated with drip holes. Through the layered arrangement of the replenishment tubes, facultative and anaerobic bacteria can be replenished at different levels of the sewage, and the mixing adequacy can be effectively increased.

[0026] In this embodiment, the temperature control module 40 includes a heating coil 41 and a temperature controller disposed on the inner wall of the tank 10. There are three sets of temperature control modules 40, which are arranged linearly and equally from the bottom of the tank 10. The installation height of the uppermost temperature control module 40 is lower than the preset maximum sludge injection height of the tank 10. In order to avoid the temperature of the part far from the heating coil 41 not reaching the optimal reaction temperature synchronously during heating, this problem can be avoided by using multiple sets of temperature control modules 40 in conjunction with the stirring assembly 30.

[0027] Furthermore, the pressure relief assembly 50 includes a pressure relief valve 51. One end of the pressure relief valve 51 is connected to the tank 10, and the other end is connected to an external gas collection device. A flow meter 52 is installed on one side of the pressure relief valve 51. The flow meter 52 can detect the gas output generated during the sludge fermentation process, which is convenient for analysis by the upper control terminal, thereby optimizing the sludge fermentation process.

[0028] Specifically, the working principle of this reactor for anaerobic fermentation of sludge is as follows: The PLC controller acquires the internal temperature of the tank 10 and the reaction efficiency reflected by the flow meter 52, and displays this data synchronously on the LCD screen and sends it to the upper control terminal. At the same time, it provides control commands to change the internal heating coil 41 and stirring motor 31, and provides a microbial replenishment tube group 20 to replenish the bacterial solution. This promotes the reaction inside the tank 10 from multiple dimensions. For example, the multi-level temperature control components and the replenishment tubes for bacterial solution, together with the stirring component 30, achieve rapid diffusion of temperature and bacterial solution, forming an anaerobic reaction without dead zones. The reported data facilitates subsequent optimization of the anaerobic fermentation process. Through the above structure, the problems of existing large-volume reactors with simple structure, poor material flowability, and insufficient mixing of sludge and microbial community are solved, which reduce fermentation efficiency and ultimately affect the quality and yield of biogas.

[0029] It should be noted that the specific models and specifications of the solenoid valve 13, control box 16, stirring motor 31, heating coil 41, temperature sensor 42 and flow meter 52 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0030] The power supply and operating principle of the solenoid valve 13, control box 16, stirring motor 31, heating coil 41, temperature sensor 42 and flow meter 52 are clear to those skilled in the art and will not be described in detail here.

[0031] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A reaction vessel for anaerobic fermentation of sludge, characterized in that, The device includes a tank body, a support member located on the outer side of the tank near the top, a side platform located on the outer side of the tank body, a control box mounted on the side platform, an inlet located on the top side of the tank body, a outlet located at the bottom, a solenoid valve located at the outlet, a stirring assembly located at the center of the tank body, a microbial replenishment pipe assembly located inside the tank body extending to the top of the tank body, a temperature control module located inside the tank body, and a pressure relief assembly located at the top of the tank body. The control box is electrically connected to the solenoid valve, the stirring assembly, the temperature control module, and the pressure relief assembly.

2. The reaction vessel for anaerobic fermentation of sludge according to claim 1, characterized in that, The control box includes an LCD touch screen and a PLC controller.

3. The reaction vessel for anaerobic fermentation of sludge according to claim 2, characterized in that, The stirring assembly includes a stirring motor disposed at the top of the tank. A first fixing frame and a second fixing frame are disposed from top to bottom on the inner side wall of the tank. A shaft is disposed between the first fixing frame and the second fixing frame. The output shaft of the stirring motor passes through the top of the tank and is connected to the shaft. Two first blades and one second blade are disposed on the shaft.

4. A reaction vessel for anaerobic fermentation of sludge according to claim 3, characterized in that, One of the first blades is located on the side near the middle of the tank, and the other is located below it. The second blade is located on the side of the tank near the bottom.

5. A reaction vessel for anaerobic fermentation of sludge according to claim 3, characterized in that, The first fixing frame has a circular ring structure at its center. A connecting arm is fixedly provided between the outer side of the ring and the side wall of the tank. A first limiting piece is provided on the outer side of the shaft, which contacts the upper part of the ring. The second fixing frame has a second circular ring at its center. A second connecting arm is fixedly provided between the outer side of the second circular ring and the side wall of the tank. A second limiting piece is provided on the outer side of the shaft, which contacts the upper part of the second circular ring.

6. A reaction vessel for anaerobic fermentation of sludge according to claim 1, characterized in that, The microbial replenishment tube assembly includes a first replenishment tube, a second replenishment tube, and a third replenishment tube. The first replenishment tube is located on the side of the tank near the top, and a first connector is welded to the top of the tank to fix the first replenishment tube. The second replenishment tube is located on the side of the tank near the middle, and a second connector is welded to the side wall of the tank to fix the second replenishment tube. The third replenishment tube is located on the side of the tank near the bottom, and a third connector is welded to the side wall of the tank to fix the third replenishment tube. The inlets of the three replenishment tubes penetrate the tank to the top, and a sealing cap is threaded to the tube opening.

7. A reaction vessel for anaerobic fermentation of sludge according to claim 6, characterized in that, The bottoms of the first replenishment tube, the second replenishment tube, and the third replenishment tube are provided with drip holes that are circumferentially separated.

8. A reaction vessel for anaerobic fermentation of sludge according to claim 1, characterized in that, The temperature control module includes a heating coil and a temperature controller installed on the inner side wall of the tank.

9. A reaction vessel for anaerobic fermentation of sludge according to claim 8, characterized in that, The temperature control module consists of three sets, which are arranged linearly and equally from the bottom of the tank, with the uppermost temperature control module installed at a height lower than the preset maximum sludge injection elevation of the tank.

10. A reaction vessel for anaerobic fermentation of sludge according to claim 1, characterized in that, The pressure relief assembly includes a pressure relief valve, one end of which is connected to the tank body and the other end is connected to an external gas collection device. A flow meter is installed on one side of the pressure relief valve.

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