A system for returning biogas residue to the field

Abstract

The utility model discloses a kind of biogas residue field application systems, it is related to livestock breeding technical field, above-mentioned for biogas residue field application system is used to extract biogas slurry in biogas tank and field application, including at least two groups of pump body, mixing tank, delivery pump and spray gun, at least two groups of pump body are installed in different preset depth in biogas tank, and are used to extract different solid content rate's biogas slurry, reduce the content of biogas slurry in different positions in biogas tank, realize cleaning a large amount of biogas residue, increase the effective pool volume of pool, increase the caching time of biogas residue, again through delivery pump and spray gun cooperation, realize the biogas slurry extracted is sprayed to farmland, reasonably applied to land, conducive to the crop's reduction of fertilizer and income increase, realize the utilization of resource.

Description

Technical Field

[0001] This utility model relates to the field of animal husbandry technology, and more specifically, to a biogas residue returning system. Background Technology

[0002] Livestock farm manure typically undergoes solid-liquid separation before entering black-film biogas digesters and biogas slurry storage tanks. These digesters and storage tanks are usually sealed with a membrane. Inside, the separated manure produces biogas within the sealed tank, while biogas residue continuously accumulates. To increase the storage capacity, the biogas residue needs to be removed. After anaerobic fermentation, the residue is rich in nitrogen, phosphorus, and potassium. Proper application to the land can reduce fertilizer use and increase crop yields, achieving resource utilization.

[0003] Currently, the main method for removing biogas residue is to use mechanical methods such as excavators. During the cleaning process, the top membrane needs to be removed and the water in the pond needs to be drained before the excavator can clean it. However, the pond needs to be filled with water continuously, and the operation of emptying the water is difficult. The pond is above ground, making it difficult for machinery to enter. In addition, the cost of using excavators for cleaning is relatively high. Furthermore, the biogas residue removed by excavators needs to be returned to the field mechanically, which increases transportation costs.

[0004] In summary, how to provide a low-cost system for cleaning biogas digesters and returning the residue to the fields is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a biogas residue returning system that can continuously extract biogas slurry from the biogas digester and spray it onto the field, thereby making full use of resources and reducing the cost of cleaning the biogas digester.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A biogas residue return system, used to extract biogas slurry from a biogas digester and return it to the field, includes:

[0008] At least two sets of pumps are installed at different preset depths in the biogas digester and are used to extract biogas slurry with different solid contents from the biogas digester.

[0009] A mixing tank, wherein at least two sets of the pumps are connected to the mixing tank via pipelines;

[0010] A delivery pump, which is connected to the mixing tank via a pipeline;

[0011] A spray gun, which is connected to the delivery pump via a pipeline.

[0012] Furthermore, the biogas digester is topped with a membrane, and the biogas residue return system also includes:

[0013] A pump well platform, which is positioned above the top membrane;

[0014] A support frame is installed on the pump well platform. The support frame is equipped with a lifting component. The pump body is connected to the lifting component, and the height of the pump body is controlled by the lifting component.

[0015] Furthermore, the pump well platform of this utility model has a T-shaped structure, and the pump well platform is provided with at least two lower pump ports, which are symmetrically arranged about the pump well platform.

[0016] Furthermore, the pump platform of this invention is made of lightweight material.

[0017] Furthermore, in this utility model, the lifting component is a hoist.

[0018] Furthermore, the bracket includes a support rod with a portal-shaped structure and a base rod with a rectangular structure, and the support rod and the base rod are fixedly connected.

[0019] Furthermore, the bracket also includes a plurality of reinforcing rods, which are arranged at a preset angle. One end of each reinforcing rod is fixedly connected to the support rod, and the other end of each reinforcing rod is fixedly connected to the base rod.

[0020] Furthermore, in this invention, at least two sets of pump bodies are respectively adopted as slurry pumps and submersible cutting pumps, and the conveying pump is a two-phase flow pump.

[0021] Furthermore, the diameter of the spray gun nozzle is between 1.5cm and 2cm.

[0022] Furthermore, in this invention, at least two sets of pump bodies are provided with control valves between them and the mixing tank.

[0023] The biogas residue returning system provided by this utility model involves installing a spray gun in the field and placing at least two sets of pumps inside the biogas digester at different preset depths. These pumps are used to extract biogas slurry with varying solids content. In other words, at least two sets of pumps can extract biogas slurry from different depths within the biogas digester. Because the solids content varies with depth, this system effectively extracts biogas slurry with different solids contents, especially the biogas residue at the bottom of the digester, reducing the amount of biogas slurry at different locations within the digester and achieving thorough cleaning. The biogas residue is increased to expand the effective volume of the digester and extend the buffer time of the biogas residue. At least two sets of pumps are connected to the mixing tank through pipelines, the delivery pump is connected to the mixing tank through pipelines, and the spray gun is connected to the delivery pump through pipelines. In other words, the mixing tank is used to mix biogas slurries with different solid contents extracted by different pumps, so that the solid content is relatively reduced, thereby meeting the normal spraying of the spray gun. Then, through the cooperation of the delivery pump and the spray gun, the extracted biogas slurry is sprayed onto the farmland. Rational application to the land is beneficial to crop reduction and increased yield, realizing resource utilization. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the system flow provided by this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the system provided by this utility model when in use;

[0027] Figure 3 This is a top view of the structure of the pump well platform provided by this utility model;

[0028] Figure 4 This is a schematic diagram of the axial side of the bracket provided by this utility model.

[0029] Figures 1-4 In the accompanying drawings, the reference numerals include:

[0030] 1. Biogas digester; 2. Pump body; 3. Mixing tank; 4. Transfer pump; 5. Spray gun; 6. Pump well platform; 7. Support frame; 7. Bottom rod 701; Support rod 702; Top membrane 8. Detailed Implementation

[0031] 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.

[0032] The core of this utility model is to provide a biogas residue returning system that can continuously extract biogas slurry from the biogas digester 1 and spray it onto the field, thereby making full use of resources and reducing the cost of cleaning the biogas digester 1.

[0033] Please refer to Figure 1 A biogas residue returning system is used to extract biogas slurry from a biogas digester 1 and return it to the field. It includes at least two sets of pump bodies 2, a mixing tank 3, a delivery pump 4, and a spray gun 5. At least two sets of pump bodies 2 are installed at different preset depths in the biogas digester 1 and are used to extract biogas slurry with different solid contents. At least two sets of pump bodies 2 are connected to the mixing tank 3 through pipes. The delivery pump 4 is connected to the mixing tank 3 through a pipe. The spray gun 5 is connected to the delivery pump 4 through a pipe.

[0034] It should be noted that the number of pump bodies 2 in this embodiment can be selected according to actual usage needs. When it is necessary to extract biogas slurry at multiple depths in the biogas digester 1, the number of pump bodies 2 can be set according to the number of depths.

[0035] In addition, in this embodiment of the present invention, a mixing mechanism is provided in the mixing tank 3. Specifically, the mixing mechanism includes a rotating shaft rotatably installed in the mixing tank 3, one end of which extends out of the mixing tank 3. The rotating shaft is controlled to rotate by a drive motor. Several mixing plates are installed on the rotating shaft located in the mixing tank 3, which helps to increase the mixing uniformity of different biogas slurries in the mixing tank 3.

[0036] In addition, in this embodiment of the utility model, a branch pipeline network is pre-buried under the farmland. The underground pipes are used to transport liquids. Starting from the pump, they are distributed in a tree-like pattern under the farmland and extend to the water outlet on the ground at intervals for connection with the spray gun 5.

[0037] In addition, in this embodiment of the utility model, the manure in the biogas digester 1 is fermented to produce biogas, and then flows into an earthen pond for storing biogas slurry through an overflow pipe. The bottom and top are covered with black film, and the biogas slurry is stored between the two layers of black film. The biogas slurry is released periodically by returning it to the field, thus forming a cycle.

[0038] Optionally, in some embodiments, the water pressure of both the pump body 2 and the delivery pump 4 is greater than 0.1 MPa.

[0039] In use, the spray gun 5 is installed in the field, and at least two sets of pumps 2 are placed inside the biogas digester 1. These pumps 2 are installed at different preset depths within the biogas digester 1 and are used to extract biogas slurry with different solid contents. In other words, at least two sets of pumps 2 can extract biogas slurry from different depths within the biogas digester 1. Because the solid contents of the biogas slurry vary with depth, this allows for the extraction of biogas slurry with different solid contents from the biogas digester 1, especially the biogas residue at the bottom of the digester 1. This reduces the amount of biogas slurry at different locations within the digester 1, effectively cleaning up large amounts of biogas residue and increasing the digester's capacity. The effective tank volume increases the buffer time of biogas residue. At least two sets of pump bodies 2 are connected to the mixing tank 3 through pipelines. The delivery pump 4 is connected to the mixing tank 3 through pipelines. The spray gun 5 is connected to the delivery pump 4 through pipelines. In other words, the mixing tank 3 is used to mix biogas slurries with different solid contents extracted by different pump bodies 2, so that the solid content is relatively reduced, thereby meeting the normal spraying of the spray gun 5. Then, through the cooperation of the delivery pump 4 and the spray gun 5, the extracted biogas slurry is sprayed onto the farmland. The rational application of biogas slurry to the land is beneficial to the reduction of fertilizer and increase of income for crops, and realizes the utilization of resources.

[0040] In the above embodiment, when determining the installation depth of the pump body 2, a combination of equipment and methods, such as an ultrasonic mud volume detector and a mud volume distribution pattern map of the tank, is used to measure the mud volume and distribution of the sealed tank; based on the mud volume distribution, the horizontal position of the pump body 2 is selected for installation, and then the placement depth of the pump body 2 is determined based on the mud volume distribution.

[0041] Specifically, if the sludge in the membrane-covered tank is not removed for a long time (more than 3 years), the sludge will accumulate in the tank and stratify. The sludge with good flowability is distributed near the water inlet pipe and is in a viscous state. The other type is far away from the water inlet and the sludge is in a blocky state. When the pump is pumping, it needs to select the viscous sludge with good flowability. Therefore, the pump body 2 should be placed within a radius circle of 25 meters from the center of the water inlet pipe.

[0042] Optionally, in some embodiments, a top membrane 8 is laid on the top of the biogas digester 1. The biogas residue returning system also includes a pump well platform 6 and a support 7. The pump well platform 6 is placed above the top membrane 8, and the support 7 is installed on the pump well platform 6. The support 7 is equipped with a lifting component. The pump body 2 is connected to the lifting component, and the height of the pump body 2 is controlled by the lifting component. That is, in order to facilitate the installation of the pump body 2, the installation position of the pump body 2 is first determined by an instrument. Then, the pump well platform 6 is placed on the top membrane 8 to support the support 7 and prevent the support 7 from tilting. Then, the lifting component is connected to the pump body 2, and the height of the pump body 2 is controlled by the lifting component, thereby realizing the control of its depth in the biogas digester 1.

[0043] In the above embodiment, the top membrane 8 of the biogas digester 1 is a black membrane. Black membranes are laid on both the top and bottom of the digester. The sewage is stored between the two layers of black membranes and undergoes anaerobic fermentation to produce biogas. The black membranes seal the entire biogas digester 1 and are fixed at the edges. Therefore, the black membranes can provide support for the installation of the pump body 2.

[0044] Optionally, in some embodiments, the pump well platform 6 has a T-shaped structure, and the pump well platform 6 is provided with at least two lower pump ports. The at least two lower pump ports are arranged symmetrically about the symmetrical face of the pump well platform. That is, by setting the pump well platform 6 with a T-shaped structure, the contact area between the entire pump well platform 6 and the black film is increased, thereby improving its support. The number of lower pump ports on the pump well platform 6 is determined according to the number of pump bodies 2 used, and they are arranged along the symmetrical line of the pump well platform 6 to improve its balance.

[0045] In other embodiments, the pump well platform 6 may adopt a cross-shaped structure, an equilateral triangle structure, a circular structure, or a rectangular structure. Specifically, it can adopt a symmetrical graphic structure, and the lower pump port is symmetrically arranged on different pump well platforms 6.

[0046] Optionally, in some embodiments, the pump well platform 6 is made of lightweight material, and its buoyancy is increased by reducing the weight of the pump well platform 6, thereby improving its support effect on the bracket 7.

[0047] Optionally, in some embodiments, the pump well platform 6 may be made of foam material. Specifically, after the pump well platform 6 is cut, it is covered with a black film to increase its strength, or it may be made of rubber or silicone material.

[0048] Optionally, in some embodiments, the lifting component is a hoist, that is, a hoist is used to control the height of the pump body 2.

[0049] Alternatively, in some embodiments, the hoist can be a manual hoist or an electric hoist.

[0050] Please refer to Figure 4 In some embodiments, the support 7 includes a support rod 702 with a portal-shaped structure and a bottom rod 701 with a rectangular structure. The support rod 702 is fixedly connected to the bottom rod 701. That is, the bottom rod 701 and the support rod 702 cooperate to support the lifting component and the pump body 2.

[0051] In other embodiments, the base rod 701 may also have a circular structure, and the support rod 702 may be located on the symmetrical plane of the base rod 701.

[0052] Optionally, in some embodiments, the bracket 7 further includes a plurality of reinforcing rods arranged at a preset angle. One end of the reinforcing rod is fixedly connected to the support rod 702, and the other end of the reinforcing rod is fixedly connected to the bottom rod 701. The reinforcing rods are used to increase the support stability of the support rod 702.

[0053] Optionally, in some embodiments, the support rod 702 and the base rod 701 are connected by welding.

[0054] Optionally, in some embodiments, at least two sets of pump bodies 2 are respectively adopted as slurry pumps and submersible cutting pumps, and the conveying pump 4 is a two-phase flow pump. The slurry pump is installed at a greater depth than the submersible cutting pump. The slurry pump is used to pump biogas residue with high solids content (8% or more). The submersible cutting pump is used to pump biogas residue with low solids content (1% or less). The two states are mixed to form biogas residue with a suitable solids content (2%-6%). The two-phase flow pump delivers the mixed biogas residue to the field plot and sprays it evenly through the spray gun 5 for use as fertilizer for corn and wheat.

[0055] Optionally, in some embodiments, the nozzle diameter of the spray gun 5 is between 1.5cm and 2cm. After mixing, the solid content of the biogas residue decreases, requiring uniform spraying onto the ground. Currently, normal clean water can be sprayed using spray belts, small spray guns 5, large spray guns 5, etc. However, biogas residue itself contains solid particles. Using functional spray belts or small spray guns 5 will clog the spray belt and nozzle, causing excessive pressure and belt bursting. Therefore, a spray gun 5 with a diameter between 1.5cm and 2cm is sufficient.

[0056] Optionally, in some embodiments, at least two sets of pump bodies are provided with control valves 9 between them and the mixing tank 3. That is, the flow rate of the two pump bodies is controlled by the control valves 9. The control valves 9 can be solenoid valves or manual valves.

[0057] In other words, the key point of this utility model embodiment is that at least two sets of pump bodies 2 are installed at different preset depths within the biogas digester 1 to extract biogas slurry with different solid content. That is, at least two sets of pump bodies 2 can extract biogas slurry from different depths within the biogas digester 1. Since the solid content of the biogas slurry varies with depth, this allows for the extraction of biogas slurry with different solid content from the biogas digester 1, especially the biogas residue at the bottom of the biogas digester 1. This reduces the biogas slurry content at different locations within the biogas digester 1, effectively removing a large amount of biogas residue and increasing the effective volume of the digester. To increase the buffer time of biogas residue, at least two sets of pump bodies 2 are connected to the mixing tank 3 through pipelines, the delivery pump 4 is connected to the mixing tank 3 through pipelines, and the spray gun 5 is connected to the delivery pump 4 through pipelines. In other words, the mixing tank 3 is used to mix biogas slurries with different solid contents extracted by different pump bodies 2, so that the solid content is relatively reduced, thereby meeting the normal spraying of the spray gun 5. Then, through the cooperation of the delivery pump 4 and the spray gun 5, the extracted biogas slurry is sprayed onto the farmland. Rational application to the land is beneficial to reducing crop yield and increasing income, and realizing the utilization of resources.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The above provides a detailed description of the biogas residue returning-to-field system provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A biogas residue returning-to-field system, used for extracting biogas slurry from a biogas digester (1) and returning it to the field, characterized in that, include: At least two sets of pump bodies (2) are installed in the biogas digester (1) at different preset depths and are used to extract biogas slurry with different solid contents from the biogas digester (1). The mixing tank (3) is connected to at least two sets of pump bodies (2) via pipelines; A delivery pump (4) is connected to the mixing tank (3) via a pipeline; The spray gun (5) is connected to the delivery pump (4) via a pipeline.

2. The biogas residue return system according to claim 1, characterized in that, The biogas digester (1) is covered with a top membrane (8), and the biogas residue return system also includes: Pump well platform (6), the pump well platform (6) is placed above the top membrane (8); A bracket (7) is installed on the pump well platform (6). A lifting component is provided on the bracket (7). The pump body (2) is connected to the lifting component and the height of the pump body (2) is controlled by the lifting component.

3. The biogas residue returning-to-field system according to claim 2, characterized in that, The pump well platform (6) has a T-shaped structure and at least two lower pump ports are provided on the pump well platform (6). The at least two lower pump ports are arranged symmetrically about the pump well platform (6).

4. A biogas residue returning-to-field system according to claim 3, characterized in that, The pump well platform (6) is made of lightweight material.

5. A biogas residue return system according to claim 2, characterized in that, The lifting device is a hoist.

6. A biogas residue return system according to claim 2, characterized in that, The bracket (7) includes a support rod (702) with a portal-shaped structure and a bottom rod (701) with a rectangular structure, and the support rod (702) is fixedly connected to the bottom rod (701).

7. A biogas residue return system according to claim 6, characterized in that, The bracket (7) also includes several reinforcing rods, which are arranged at a preset angle. One end of each reinforcing rod is fixedly connected to the support rod (702), and the other end of each reinforcing rod is fixedly connected to the bottom rod (701).

8. A biogas residue return system according to claim 1, characterized in that, At least two sets of the pump bodies (2) are respectively slurry pumps and submersible cutting pumps, and the conveying pump (4) is a two-phase flow pump.

9. A biogas residue return system according to claim 1, characterized in that, The nozzle diameter of the spray gun (5) is between 1.5cm and 2cm.

10. A biogas residue return system according to any one of claims 1-9, characterized in that, At least two sets of the pump bodies are provided with control valves (9) between them and the mixing tank (3).

Images