A biogas slurry primary sedimentation tank

Abstract

The utility model relates to kitchen waste treatment technical field, concretely relates to a biogas slurry primary sedimentation tank. Including the jar body, the middle position vertical fixed mounting of jar body top is used for injecting the feed pipe of biogas slurry, the lower end export of feed pipe extends to the inside of jar body, the circumference lateral wall of jar body is connected with the liquid outlet pipe fixedly. The utility model discloses when the valve on the sand discharge pipe opens the deslag, the slow -speed motor drive has the sawtooth groove's auger blade rotation, and the sawtooth of rotation carries out high -frequency shearing fracture to the hardening biogas residue layer, destroys its colloid structure and eliminates hard block, and simultaneously, the auger blade continuously pushes down the biogas residue after the fracture to the sand discharge port axial, and the sawtooth can also hook and tear the long fiber impurity in the biogas residue, prevent its entanglement extension shaft or block the sand discharge port, and this kind of set fracture, conveying, prevent the integrated synergistic effect of blocking, improves the efficiency and reliability of biogas residue discharge, and ensures that the sedimentation tank continuously and stably operates.

Description

Technical Field

[0001] This utility model relates to the field of kitchen waste treatment technology, specifically to a primary sedimentation tank for biogas slurry. Background Technology

[0002] After being processed by an anaerobic fermentation system, food waste produces biogas and bioslurry rich in organic matter. This biogas slurry contains a certain amount of biogas residue. If it is directly introduced into the subsequent biochemical treatment system, it will increase the biochemical load and affect the treatment efficiency. The current mainstream process is to send all the biogas slurry into a screw press dewatering machine, relying on the synergistic effect of its screw extrusion and gap filtration to separate solids and liquids; the separated clear liquid then enters the biochemical system.

[0003] Because all biogas slurry needs to be treated by a screw press, the screw press must bear an extremely heavy processing load. This not only reduces the processing efficiency of a single unit but also limits the upper limit of the entire system's processing capacity. The equipment operates at high load for extended periods, and the massive processing volume required to handle all the biogas slurry directly drives up operating costs. On the one hand, driving the screw press for powerful extrusion and filtration consumes a large amount of electricity; on the other hand, in order to improve the separation effect and increase the yield of clarified liquid, a large amount of flocculants and other chemical agents are usually added. Electricity and chemical costs constitute the main operating costs of this stage, keeping biogas slurry disposal costs high.

[0004] The existing process ignores the natural physical property that the density difference between biogas residue and supernatant allows for preliminary separation through gravity sedimentation. It forces the supernatant, which could be separated by simple sedimentation, into the screw press for further processing, which is a redundancy in the process. This not only increases unnecessary energy consumption and reagent usage, but also leads to longer processing time and increased equipment wear. Utility Model Content

[0005] The purpose of this utility model is to provide a primary sedimentation tank for biogas slurry to solve the problems mentioned in the background art above:

[0006] The existing process forces the supernatant, which could be separated by simple sedimentation, into the screw press for further processing, increasing unnecessary energy consumption and reagent usage.

[0007] To address the above problems, the present invention provides a primary sedimentation tank for biogas slurry, comprising a tank body. A feed pipe for injecting biogas slurry is vertically fixedly installed at the middle of the top of the tank body. The lower outlet of the feed pipe extends into the interior of the tank body. A discharge pipe is fixedly connected to the circumferential side wall of the tank body, located above the lower outlet of the feed pipe. A weir assembly is installed inside the tank body at a position corresponding to the discharge pipe, used to prevent floating matter on the surface of the biogas slurry from entering the discharge pipe. An assembly cylinder is fixedly installed at the lower end of the tank body, and a sand discharge pipe is fixedly connected to the bottom of the circumferential side wall of the assembly cylinder. An arch-breaking feeding mechanism is installed inside the tank body below the outlet of the feed pipe, used to break up the sedimented biogas residue and convey it downwards, promoting the discharge of biogas residue from the sand discharge pipe.

[0008] As a further improvement to this technical solution, the cofferdam assembly includes a baffle frame and an overflow box fixedly connected to the inner circumference of the tank body. The overflow box is located inside the baffle frame, and the liquid outlet pipe is connected to the inside of the overflow box.

[0009] As a further improvement to this technical solution, a flow gap is provided between the inner wall of the dirt-blocking frame and the outer wall of the overflow box, and the upper side wall of the dirt-blocking frame is higher than the upper side wall of the overflow box.

[0010] As a further improvement to this technical solution, a number of connecting plates are fixedly connected in a ring array near the lower end of the circumferential sidewall of the feed pipe. The lower ends of all the connecting plates are fixedly connected to a conical reflector, and a drainage gap is provided between the conical surface of the reflector and the lower end surface of the feed pipe.

[0011] As a further improvement to this technical solution, the arch-breaking feeding mechanism includes a motor fixedly installed on the lower side wall of the assembly cylinder. The upper end of the motor rotates through the bottom of the assembly cylinder and is coaxially fixedly connected to an extension shaft via a coupling. The upper end of the extension shaft is rotatably installed on the lower side wall of the reflector plate.

[0012] As a further improvement to this technical solution, the arch-breaking feeding mechanism also includes auger blades fixedly connected to the extension shaft, and the outer edge of the auger blades is provided with serrated grooves.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This primary sedimentation tank for biogas slurry serves as a pretreatment unit in the food waste treatment system, enabling efficient diversion of biogas slurry. After sedimentation and separation, the supernatant discharged through the outlet pipe can directly enter the subsequent biochemical treatment system for further treatment, while the concentrated biogas residue discharged through the sand discharge pipe enters the screw press dewatering machine for dewatering and volume reduction. This design reduces the total amount of biogas slurry directly entering the screw press for treatment, lowers the overall energy consumption and chemical consumption costs of biogas slurry treatment, saves treatment time, and optimizes the system process.

[0015] 2. In this primary sedimentation tank for biogas slurry, when the valve on the sand discharge pipe is opened to discharge slag, a slow-speed motor drives the auger blades with serrated grooves to rotate. The rotating serrations perform high-frequency shearing and crushing on the hardened biogas slurry layer, destroying its colloidal structure and eliminating hard lumps. At the same time, the auger blades continuously push the crushed biogas slurry downwards axially to the sand discharge port. The serrations can also hook and tear long fibrous impurities in the biogas slurry, preventing them from entangled in the extension shaft or blocking the sand discharge port. This synergistic effect of crushing, conveying, and anti-clogging improves the efficiency and reliability of biogas slurry discharge and ensures the continuous and stable operation of the sedimentation tank. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the arch-breaking feeding mechanism of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the feed pipe, reflector, and connecting plate of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the tank, the outlet pipe, and the dike assembly of this utility model.

[0021] The meanings of the labels in the diagram are as follows:

[0022] 1. Tank body; 11. Discharge pipe; 12. Assembly cylinder; 121. Sand discharge pipe; 13. Inspection and observation hole; 14. Vent hole; 15. Inspection and manhole; 16. Level gauge installation pipe;

[0023] 2. Feed pipe; 21. Reflector plate; 22. Connecting plate;

[0024] 3. Cofferdam components; 31. Pollution barrier frame; 32. Overflow box;

[0025] 4. Arch-breaking feeding mechanism; 41. Motor; 42. Extension shaft; 43. Screw blade. Detailed Implementation

[0026] 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.

[0027] Example 1

[0028] Please see Figure 1 , Figure 2 and Figure 4 As shown, the purpose of this embodiment is to provide a primary sedimentation tank for biogas slurry, including a tank body 1. The tank body 1 is a large container used for sedimentation treatment of large quantities of biogas slurry. Several support rods are fixedly connected in a ring array on the outer circumference of the tank body 1. The bottom ends of all support rods are in contact with the ground support surface, providing stable support for the tank body 1. A feed pipe 2 for injecting biogas slurry is vertically fixedly installed at the middle position of the top of the tank body 1. The upper inlet of the feed pipe 2 is connected to an external biogas slurry conveying pipe, and the lower outlet of the feed pipe 2 extends into the interior of the tank body 1. Several connecting plates 22 are fixedly connected in a ring array near the lower end of the circumference of the feed pipe 2. The lower ends of all connecting plates 22 are fixedly connected to a conical reflector plate 21. The cone tip of the reflector plate 21 is set upward. A drainage gap is provided between the conical surface of the reflector plate 21 and the lower end surface of the feed pipe 2. The reflector plate 21 is used to evenly disperse the biogas slurry discharged from the feed pipe 2 into the interior of the tank body 1.

[0029] A liquid outlet pipe 11 is fixedly connected to the circumferential side wall of the tank body 1. The liquid outlet pipe 11 is connected to the interior of the tank body 1. The liquid outlet pipe 11 is located above the lower outlet of the feed pipe 2, that is, the liquid outlet pipe 11 is higher than the lower outlet of the feed pipe 2. An assembly cylinder 12 is fixedly installed at the lower end of the tank body 1. The assembly cylinder 12 is connected to the interior of the tank body 1. A sand discharge pipe 121 is fixedly connected to the bottom of the circumferential side wall of the assembly cylinder 12. The sand discharge pipe 121 extends downward at an angle and is connected to the interior of the assembly cylinder 12. When the sedimentation tank is in use, an electro-hydraulic knife gate valve is fixedly installed at the end of the sand discharge pipe 121 away from the assembly cylinder 12. The electro-hydraulic knife gate valve is a commercially available mature product. It is normally in the closed state. Its structure and working principle will not be described in detail here.

[0030] During operation, the biogas slurry conveying pipeline delivers biogas slurry into the feed pipe 2. The biogas slurry enters the tank 1 through the discharge gap. As the biogas slurry accumulates in the tank 1, the biogas residue settles to the bottom of the tank 1 under gravity, achieving initial separation of biogas residue and clear liquid. When the biogas slurry level in the tank rises above the lower end of the feed pipe 2, the continuously entering biogas slurry is evenly distributed by the reflector plate 21 and flows upward slowly. At this time, the biogas residue settles downward under gravity, forming a counter-current movement with the upward liquid flow, further promoting the separation of biogas residue and clear liquid. When the clear liquid level reaches the height of the discharge pipe 11, the separated clear liquid is discharged through the discharge pipe 11, while the biogas residue is deposited at the bottom of the tank 1.

[0031] To prevent floating debris on the surface of the biogas slurry from entering the outlet pipe 11, a dike assembly 3 is installed inside the tank 1 at a position corresponding to the outlet pipe 11. The structure of the dike assembly 3 is detailed below, referring to... Figure 5 The cofferdam assembly 3 includes a baffle frame 31 and an overflow box 32 fixedly connected to the inner circumference of the tank 1. The overflow box 32 is located inside the baffle frame 31. The baffle frame 31 is n-shaped. The upper side of the overflow box 32 is uncovered. The liquid outlet pipe 11 is connected to the inside of the overflow box 32. A flow gap is provided between the inner wall of the baffle frame 31 and the outer wall of the overflow box 32. The upper side wall of the baffle frame 31 is higher than the upper side wall of the overflow box 32, and the upper side wall of the overflow box 32 is higher than the highest point inside the liquid outlet pipe 11.

[0032] When the biogas slurry level exceeds the lower side wall of the overflow box 32, some biogas slurry enters the flow gap. When the level is level with the upper side wall of the overflow box 32, as the feed pipe 2 continues to inject biogas slurry into the tank 1, the biogas slurry in the flow gap will overflow into the overflow box 32 and then be discharged from the tank 1 through the outlet pipe 11. Since the upper side wall of the baffle frame 31 is higher than the upper side wall of the overflow box 32, the floating objects on the surface of the biogas slurry outside the flow gap will be effectively blocked by the baffle frame 31, thereby reducing the number of floating objects entering the outlet pipe 11.

[0033] It should be noted that when using this sedimentation tank, it is necessary to ensure that the flow rate of biogas slurry entering the tank 1 through the feed pipe 2 is less than or equal to the flow rate discharged through the outlet pipe 11, so as to stabilize the height of the liquid level inside the tank 1 and prevent the liquid level inside the tank from exceeding the upper side wall of the baffle frame 31, thus maintaining the baffle frame 31's baffle function effectively.

[0034] Tank 1 is composed of a cylindrical tube and a conical tube fixed at the lower end. The biogas residue is mainly deposited inside the conical tube. A liquid level gauge installation pipe 16 is fixedly connected to the conical side wall of the conical tube near the top of the cone. In actual application, a mud level gauge with a valve (a commercially available mature product, the structure and principle of which will not be described in detail) is installed in the liquid level gauge installation pipe 16 to monitor the deposition height of biogas residue inside tank 1.

[0035] Both the mud level gauge and the electro-hydraulic knife gate valve are electrically connected to the external control equipment. When the mud level gauge detects that the height of the biogas residue inside the tank 1 has reached the preset upper limit, it sends a signal to the control equipment. The control equipment then opens the electro-hydraulic knife gate valve, allowing the deposited biogas residue to be discharged through the sand discharge pipe 121 under the action of gravity. This automatic slag discharge mechanism can effectively prevent the biogas residue from accumulating too high and clogging the lower end of the feed pipe 2. When the mud level gauge detects that the biogas residue height has dropped to the preset lower limit, the control equipment closes the electro-hydraulic knife gate valve, and the biogas residue inside the tank 1 returns to accumulation.

[0036] To improve the discharge efficiency of biogas residue, an arch-breaking feeding mechanism 4 is installed inside the tank 1 below the outlet of the feed pipe 2. The arch-breaking feeding mechanism 4 is used to break up the deposited biogas residue and convey it downwards, promoting the discharge of biogas residue from the sand discharge pipe 121. The structure of the arch-breaking feeding mechanism 4 is detailed below, referring to... Figure 3 The arch-breaking feeding mechanism 4 includes a motor 41 fixedly installed on the lower side wall of the assembly cylinder 12. The motor 41 is a slow-speed motor and is electrically connected to an external control device. The upper end of the motor 41 rotates through the bottom of the assembly cylinder 12 and is coaxially fixedly connected to an extension shaft 42 via a coupling. A sealed bearing is installed between the output shaft of the motor 41 and the assembly cylinder 12 to prevent biogas leakage. The upper end of the extension shaft 42 is rotatably installed on the lower side wall of the reflector plate 21 to ensure the stability of the extension shaft 42 during rotation. The arch-breaking feeding mechanism 4 also includes an auger blade 43 fixedly connected to the extension shaft 42. A serrated groove is provided at the outer edge of the auger blade 43. The surfaces of the extension shaft 42 and the auger blade 43 are coated with polytetrafluoroethylene to reduce sludge adhesion.

[0037] When the electro-hydraulic knife gate valve opens to discharge slag, the control equipment synchronously starts the motor 41. The motor 41 drives the extension shaft 42 to rotate slowly, which in turn drives the auger blades 43 to rotate synchronously. The rotating sawtooth grooves shear and break the hardened sludge layer at high frequency, destroy the fibrous impurities of kitchen waste in the sludge, and eliminate hard lumps. At the same time, the auger blades 43 push the crushed sludge axially to the assembly cylinder 12, so that it can be discharged through the sand discharge pipe 121. The sawtooth edges agitate the sludge during rotation, preventing sludge bridging and hooking and tearing fibrous impurities (such as vegetables in kitchen waste), effectively preventing fibrous impurities from entangled in the extension shaft 42 or blocking the sand discharge pipe 121.

[0038] In addition, the top of the tank 1 is provided with an inspection observation hole 13 and an inspection manhole 15. The inspection observation hole 13 is located directly above the cofferdam component 3. In actual application, both the inspection observation hole 13 and the inspection manhole 15 are covered with protective covers to prevent foreign objects from falling into the tank 1. After the biogas slurry and biogas residue inside the tank 1 are emptied, the operator can open the inspection observation hole 13 to observe whether the flow gap of the cofferdam component 3 is blocked by floating objects. If a blockage is found, the operator can enter the tank through the inspection manhole 15 to clean it.

[0039] The top of the tank body 1 is also provided with an exhaust port 14, which is used to discharge the biogas generated inside the tank body 1 to prevent pressure buildup from causing safety hazards. In actual application, an explosion-proof flame arrestor vent cap is installed inside the exhaust port 14. This vent cap can prevent external flames from entering the tank through the exhaust port 14 and igniting the biogas, while allowing the biogas to be discharged safely.

[0040] The sedimentation tank is a component of the food waste treatment system. The biogas slurry passes through the primary sedimentation tank and is discharged directly into the biochemical system through the slurry outlet pipe 11. The biogas residue discharged through the sand discharge pipe 121 is treated by the screw press, which reduces the amount of biogas slurry to be treated, lowers disposal costs, and saves processing time.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A primary sedimentation tank for biogas slurry, comprising a tank body (1), characterized in that: A feed pipe (2) for injecting biogas slurry is vertically fixed at the middle position of the top of the tank (1). The lower end outlet of the feed pipe (2) extends into the interior of the tank (1). An outlet pipe (11) is fixedly connected to the circumferential side wall of the tank (1). The outlet pipe (11) is located above the lower end outlet of the feed pipe (2). A dike assembly (3) is set inside the tank (1) at a position corresponding to the outlet pipe (11). The dike assembly (3) is used to block... Floating matter on the surface of the biogas slurry enters the outlet pipe (11). An assembly cylinder (12) is fixedly installed at the lower end of the tank (1). A sand discharge pipe (121) is fixedly connected to the bottom of the circumferential side wall of the assembly cylinder (12). An arch-breaking feeding mechanism (4) is set inside the tank (1) below the outlet of the feed pipe (2). The arch-breaking feeding mechanism (4) is used to break the arches of the deposited biogas residue and transport it downwards, promoting the discharge of biogas residue from the sand discharge pipe (121).

2. The primary sedimentation tank for biogas slurry according to claim 1, characterized in that: The cofferdam assembly (3) includes a baffle frame (31) and an overflow box (32) fixedly connected to the inner circumference of the tank body (1). The overflow box (32) is located inside the baffle frame (31), and the liquid outlet pipe (11) is connected to the inside of the overflow box (32).

3. The primary sedimentation tank for biogas slurry according to claim 2, characterized in that: A flow gap is provided between the inner wall of the dirt baffle (31) and the outer wall of the overflow box (32), and the upper side wall of the dirt baffle (31) is higher than the upper side wall of the overflow box (32).

4. The primary sedimentation tank for biogas slurry according to claim 1, characterized in that: The feed pipe (2) has several connecting plates (22) fixedly connected in a ring array near the lower end of its circumferential sidewall. The lower ends of all the connecting plates (22) are fixedly connected to a conical reflector (21). A drain gap is provided between the conical surface of the reflector (21) and the lower end surface of the feed pipe (2).

5. The primary sedimentation tank for biogas slurry according to claim 4, characterized in that: The arch-breaking feeding mechanism (4) includes a motor (41) fixedly installed on the lower side wall of the assembly cylinder (12). The upper end of the motor (41) rotatably passes through the bottom of the assembly cylinder (12) and is coaxially fixedly connected to an extension shaft (42) via a coupling. The upper end of the extension shaft (42) is rotatably installed on the lower side wall of the reflector plate (21).

6. The primary sedimentation tank for biogas slurry according to claim 5, characterized in that: The arch-breaking feeding mechanism (4) also includes an auger blade (43) fixedly connected to the extension shaft (42), and the outer edge of the auger blade (43) is provided with a serrated groove.

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