Sealed feeding device for dry anaerobic fermentation

Abstract

The utility model relates to the technical field of cold chains, in particular to a sealed feeding device for dry anaerobic fermentation, which comprises a workbench, a screw conveyer fixedly mounted on the workbench, and a feeding pipe of an obtuse angle structure, one end of which is communicated with a reactor for dry anaerobic fermentation, and the other end of which is communicated with a feeding pipe for dry anaerobic fermentation. The other end of the feeding pipe is communicated with the discharging end of the spiral conveyor, and the spiral conveyor axially moves along the other end of the feeding pipe; one end, communicated with the reactor, of the feeding pipe is higher than the axial movement position of the spiral conveyor; the communication part between the feeding pipe and the reactor is positioned at the top end of the reactor. According to the utility model, the production efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dry anaerobic fermentation reactors, in particular to a sealed feeding device for dry anaerobic fermentation. Background Art

[0002] Dry anaerobic digestion is a technology for treating organic waste with a high solids content, particularly agricultural waste such as platycodon grandiflorum. Compared to wet anaerobic digestion, dry anaerobic digestion uses a lower moisture content (typically between 20% and 60%), thus eliminating the need for large amounts of water to dilute the material. Dry anaerobic digestion also results in lower biogas production, higher volumetric gas production, and lower energy consumption.

[0003] The reactor using dry anaerobic fermentation requires a high solid content and a high impurity content due to its own properties, which results in high requirements for the water content of the raw materials and the feeding device. In general, the raw materials selected are dry materials. In the prior art, a feeding device for horizontal dry anaerobic fermentation is selected, such as a horizontal dry anaerobic fermentation reactor inlet and outlet and reflux system with patent application number CN202210521804.0. The patent discloses a feeding device and reactor for a dry anaerobic fermentation reactor. The feeding device is inserted into the reactor at an upward downward angle, including a feeding screw conveyor, which is inserted obliquely downward into the feeding end of the horizontal dry anaerobic fermentation reactor, and is inserted obliquely downward at 45° below the liquid level in the reactor. The material is pushed below the liquid level of the reactor by the feeding screw conveyor. Although the feeding device and the feeding screw conveyor are inserted below the liquid level in the reactor to prevent the biogas in the reactor from escaping to the feeding side through the screw, when the feeding screw conveyor is inserted below the liquid level in the reactor, the liquid in the reactor needs to decompose the dry material, making the liquid in the reactor highly corrosive. Long-term contact with the liquid in the reactor easily corrodes the feeding screw conveyor, which requires frequent maintenance of the screw conveyor and reduces production efficiency. At the same time, the use of this feeding device has high requirements for raw materials, because the dry material is directly fed into the reactor under the thrust of the feeding screw conveyor and the weight of the dry material itself, without reducing the moisture content of the raw material. Therefore, the raw material must be a dry material with a moisture content generally between 20% and 60%, and the scope of application of the raw material is relatively small. Utility Model Content

[0004] The utility model aims to provide a sealed feeding device for dry anaerobic fermentation, so as to improve production efficiency.

[0005] Basic solution: A sealed feeding device for dry anaerobic fermentation, including a workbench and a screw conveyor. The screw conveyor is fixedly installed on the workbench. It also includes a feed pipe with an obtuse-angle structure, one end of which is connected to a reactor for dry anaerobic fermentation, and the other end is connected to the discharge end of the screw conveyor. The screw conveyor moves axially along the other end of the feed pipe; the end of the feed pipe connected to the reactor is higher than the position of axial movement of the screw conveyor; the connection between the feed pipe and the reactor is located at the top of the reactor.

[0006] Beneficial effects: Although the existing technical structure is to insert the screw conveyor in the feed pipe obliquely downward below the liquid surface in the reactor, so that the gravity of the raw materials themselves can be used as power to reduce the energy loss of the screw conveyor, but this is relatively strict for the control of the raw materials. The raw materials must be dry materials, and the screw conveyor is in direct contact with the liquid surface. The liquid in the reaction tank is highly corrosive, which has a greater corrosion effect on the screw conveyor, resulting in a higher number of maintenance times for the screw conveyor; at the same time, the screw conveyor directly transports the raw materials into the reactor and does not squeeze the raw materials. The intervals between the raw materials are large, the internal volume of the reactor is certain, but the amount of raw materials participating in the reaction is small.

[0007] The structure is different from that of the prior art. First, the screw conveyor of this basic solution only moves axially in the feed pipe and does not contact the liquid surface in the reaction tank, which reduces the corrosion of the screw conveyor, thereby reducing the maintenance times of the screw conveyor and improving production efficiency.

[0008] Secondly, the feed pipe is set at an obtuse angle. When the raw materials in the feed pipe pass through the bend in the "obtuse angle" area, they will be subjected to the gravity of the raw materials themselves as resistance. In addition, the reactor contains gas (such as biogas), and the pressure generated by the gas will also bring resistance to the raw materials. The thrust and resistance of the screw conveyor squeeze the raw materials, not only to expel the external air remaining in the raw materials, preventing external air from entering the reactor and interfering with the anaerobic fermentation reaction, but also to squeeze out the moisture between the raw materials. Squeezing out the moisture between the raw materials during the propulsion of the screw conveyor can facilitate a wider range of raw material screening. The raw materials are not only suitable for dry materials, but also for raw materials with a moisture content of 60% to 70%. The raw materials are compressed before entering the reactor. Therefore, in the same reactor volume, more compressed raw materials can be accommodated to enter the reactor, thereby increasing the amount of raw materials participating in dry anaerobic fermentation, thereby improving production efficiency.

[0009] Furthermore, when the thrust of the screw conveyor is greater than the resistance, the raw materials are continuously fed into the reactor. At this time, the gases (such as biogas) in the reactor are difficult to escape through the raw materials into the feed pipe, the screw conveyor, or the external environment outside the feed pipe. The gases in the reactor are toxic, so whether feeding or maintaining the screw conveyor pipe, toxic gases will not escape from the feed pipe.

[0010] Preferably, the feed pipe includes a straight pipe and a curved pipe, the straight pipe is fixedly connected to the curved pipe; the straight pipe is coaxially arranged with the screw conveyor; and the curved pipe has an obtuse angle structure with a circular arc.

[0011] Beneficial effects: The straight pipe is coaxially arranged with the screw conveyor, the straight pipe and the bent pipe are fixedly connected, the end of the bent pipe away from the straight pipe is connected to the reactor, the straight pipe and the screw conveyor are coaxially arranged, based on the mechanical characteristics of the screw conveyor itself, the screw conveyor can only move along the axial direction of the straight pipe and will not enter the bent pipe, so based on the installation position and the characteristics of the screw conveyor itself, the conveyor and the reactor are isolated by the bent pipe, thus preventing the screw conveyor from entering the reactor. In addition, the bent pipe has an obtuse angle structure with an arc, which is smoother when transporting the raw materials to the reactor than if the bent pipe has an obtuse angle structure formed by two rays. At the same time, the bent pipe has an obtuse angle structure with an arc, which can facilitate the accumulation of raw materials on the arc area. The raw materials are continuously accumulated so that the raw materials cover the entire arc area to prevent the gas in the reactor from escaping out of the feed pipe.

[0012] Preferably, it also includes a sealing ring, which is located in the feed pipe, with the outer ring of the sealing ring pressed against the inner surface of the feed pipe and the inner ring pressed against the outer surface of the screw conveyor.

[0013] Beneficial effect: The screw conveyor and the feed pipe are connected through a gap fit. There is a certain gap between the screw conveyor and the feed pipe. The gas in the feed pipe or the moisture in the raw material will be discharged through the gap. The outer surface of the screw conveyor and the inner surface of the feed pipe are sealed by the sealing ring, which can effectively prevent the gas in the feed pipe or the moisture in the raw material from being discharged from the gap.

[0014] Preferably, the length of the elbow is 600 mm.

[0015] Beneficial effects: If the elbow is too long, the screw conveyor needs a large thrust to push the raw materials into the reactor, which consumes too much energy and increases production costs; if the elbow is too short, it is not easy for the raw materials to form an extruded and piled state.

[0016] Preferably, the feeding tube has an obtuse angle structure, and the obtuse angle is 150°.

[0017] Beneficial effect: The effect of this basic solution can be achieved only by setting a reasonable angle obtained through repeated experiments based on the size, shape, and other characteristics of the feed tube of this basic solution. Specifically, when the inclination angle of the feed tube is 150°, the raw materials will form resistance in the process of being transported from the feed tube into the reactor due to their own gravity in the area with an inclination angle of 150°. The resistance formed by gravity is related to the inclination angle. If the inclination angle is larger, the resistance will be greater. When the resistance is too large, the thrust of the screw conveyor will be greater during the transportation of raw materials, which will not achieve the effect of energy saving. When the resistance is too small, it is not conducive to the squeezing and stacking of the raw materials. The gas in the reactor will easily escape from the gaps between the raw materials, and the moisture between the raw materials will also be difficult to squeeze out. Therefore, setting the inclination angle of the feed tube to 150° not only achieves the effect of saving energy, but also facilitates the squeezing and stacking of the raw materials.

[0018] Preferably, a pressure sensor is provided at one end of the screw conveyor away from the feeding pipe.

[0019] Beneficial effect: The pressure sensor can feedback the pressure value, so that the screw conveyor can adjust its thrust quickly and accurately.

[0020] Preferably, it includes a propulsion electric cylinder; the propulsion electric cylinder is fixedly installed on the workbench, the propulsion electric cylinder is connected to the screw conveyor, and the propulsion electric cylinder is used to push the screw conveyor to perform axial movement in the feed pipe.

[0021] Beneficial effect: The setting of the propulsion electric cylinder can help push the screw conveyor to make axial movement in the feed pipe.

[0022] Preferably, the screw conveyor comprises a feed opening, which is circular and has a diameter of 650 mm.

[0023] Beneficial effects: When the diameter of the feed port is greater than 650 mm, too much raw material enters the screw conveyor per unit time, which easily causes the screw conveyor to be blocked; when the diameter of the feed port is less than 650 mm, too little raw material enters the screw conveyor per unit time, and the raw material in the feed pipe accumulates and covers the cross-sectional area of ​​the feed pipe for a long time, which easily causes the gas in the reactor to escape from the feed port side of the screw conveyor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 (a) is a structural schematic diagram of a sealed feeding device for dry anaerobic fermentation according to an embodiment;

[0025] Figure 2 (b) is a schematic structural diagram of a sealed feeding device for dry anaerobic fermentation according to an embodiment;

[0026] Figure 3It is a structural schematic diagram of the feeding pipe of the embodiment;

[0027] Figure 4 This is a schematic structural diagram of a sealed feeding device for dry anaerobic fermentation according to an embodiment (c). DETAILED DESCRIPTION

[0028] The reference numerals in the drawings of the specification include:

[0029] Feed pipe 1, screw conveyor 2, workbench 3, reactor 4, pressure sensor 5, wall 6, straight pipe 11, curved pipe 12, thrust shaft 21, variable pitch spiral blade 22, feed port 23, locking mechanism 31, connecting seat 32, propulsion electric cylinder 33, locking nut 34, support 35, guide key 36, liquid level 41.

[0030] Example

[0031] like Figure 1 and 2 As shown, this embodiment provides a sealed feeding device for dry anaerobic fermentation, including a workbench 3, a feeding pipe 1 and a screw conveyor 2. A sealed feeding device for dry anaerobic fermentation is connected to a reactor 4, and the sealed feeding device inputs the raw materials into the reactor 4. The screw conveyor 2 is fixedly mounted on the workbench 3. In this embodiment, the reactor 4 is an anaerobic fermentation tank. Figure 2 As shown, the right side of the dotted line can be regarded as the feed pipe 1.

[0032] Specifically, such as Figure 3 As shown, the feed pipe 1 is arranged in an obtuse angle structure. In this embodiment, the feed pipe 1 is an obtuse angle structure with a rounded transition, or can be characterized as an obtuse angle structure with a circular arc. The feed pipe 1 includes a straight pipe 11 and a curved pipe 12; the straight pipe 11 and the curved pipe 12 are connected by welding. Figure 3In the figure, the straight pipe 11 is placed horizontally, and the dotted line in the middle of the feed pipe 1 separates the straight pipe 11 on the left side of the dotted line from the curved pipe 12 on the right side of the dotted line. The connection point between the curved pipe 12 and the reactor 4 is higher than the liquid level 41 in the reactor 4. The difference between the curved pipe 12 and the straight pipe 11 is that one section of the curved pipe 12 is curved, and this section of the pipe is close to the straight pipe 11, and its curvature angle is α, α = 150°; the other section of the pipe is inclined and straight, and this section of the pipe is close to the reactor 4. The angle formed by the curved pipe 12 and the ground is β, β = 30°. The force on the raw material can be known from the formula. Among them, Fraw is the force on the raw material, Fscrew is the thrust of the screw conveyor 2, G is the weight of the material, and μ is the friction coefficient. When β < 45°, it is more suitable. Secondly, according to the arc length of the bend 12, the distance from the raw material moving in the feed pipe 1 to the connection between the reactor 4 and the feed pipe 1, the pressure in the reactor 4 and the type of raw material, after multiple tests, β = 30° is the optimal value. In this embodiment, the length of the bend 12 is 600 mm. Figure 1 As shown, the area between the two dotted lines can be regarded as a straight tube 11.

[0033] In the prior art, the screw conveyor 2 includes a housing, a sealing ring positioned within the feed pipe 1, the outer surface of the sealing ring abutting the inner wall of the straight pipe 11, and the inner surface of the sealing ring abutting the outer surface of the housing of the screw conveyor 2. In this embodiment, the sealing ring is an O-ring, whose inner diameter is larger than the diameter of the screw conveyor 2 and whose outer diameter is smaller than the diameter of the straight pipe 11. The O-ring is hollow cylindrical with an axial length of 200 mm. There are two sealing rings, one located at the discharge end of the screw conveyor 2 and the other near the left end of the feed pipe 1.

[0034] Screw conveyor 2 is fixedly mounted on workbench 3 and coaxially arranged with straight tube 11. Screw conveyor 2 is inserted into straight tube 11 with a clearance fit, so that its discharge end is connected to straight tube 11. Screw conveyor 2 can move axially along straight tube 11. This axial movement of screw conveyor 2 within straight tube 11 squeezes the raw materials in feed tube 1 and pushes them into reactor 4. The model of screw conveyor 2 is YZGX500-LS400.

[0035] Specifically, such as Figure 2As shown, the screw conveyor 2 includes a shell, a propulsion electric cylinder 33, a variable pitch spiral blade 22, a thrust shaft 21, a feed port 23 and a discharge end. The feed port 23 is located on the left side of the feed pipe. The feed port 23 is circular and has a diameter of 650 mm. The right end of the thrust shaft 21 is inserted into the straight pipe 11, and the thrust moves axially along the straight pipe 11 to squeeze the raw materials in the feed pipe 1 and push the raw materials to move in the feed pipe 1. The feed port 23 is located above the thrust shaft 21, and the discharge end is located on the right side of the thrust shaft 21, that is, the right end opening of the shell is the discharge end. In the prior art, the screw conveyor 2 also includes a motor and a coupling. The coupling is installed at the left end of the feed pipe 1, the motor is installed at the left end of the coupling, and the thrust shaft 21 is connected to the motor through the coupling. A pressure sensor 5 is provided at the left end of the thrust shaft 21, and a variable pitch spiral blade 22 is welded on the thrust shaft 21. The variable pitch spiral blade 22 is located in the feed pipe 1, and the pitch of the variable pitch spiral blade 22 gradually decreases along the direction from the straight pipe section 11 to the curved pipe section 12. The pitch of the variable pitch spiral blade 22 is set in this way, which can speed up the extrusion of raw materials and discharge air and moisture. The support base of the screw conveyor 2 is set below the screw conveyor 2. It should be understood that the screw conveyor 2 is a prior art structure, the screw conveyor 2 is installed on the workbench 3, and how the screw conveyor 2 performs axial movement in the straight pipe 11 are all prior art and can be installed and implemented according to the procedures of ordinary technicians in this field.

[0036] like Figure 4 As shown, a propulsion cylinder 33 is bolted to the bottom of the workbench 3. The piston rod of the propulsion cylinder 33 is welded to a connection base 32 on the screw conveyor 2 below the screw conveyor 2. The piston rod of the propulsion cylinder 33 drives the movement of the screw conveyor 2. A support 35 is provided at the bottom of the screw conveyor 2, which is placed on the workbench 3. The bottom surface of the support 35 is provided with a keyway, which cooperates with the guide key 36 provided on the workbench 3 and can slide with each other to ensure that the screw conveyor 2 can move smoothly. A locking mechanism 31 is provided on the workbench 3. When conveying different types of materials, the position of the screw conveyor 2 changes. When the screw conveyor 2 moves to the desired position, the locking mechanism 31 locks the support 35, thereby fixing the screw conveyor 2 to the workbench 3. A connecting seat 32 is provided at the bottom end of the screw conveyor 2, and a propulsion electric cylinder 33 is bolted under the workbench 3. The piston rod of the propulsion electric cylinder 33 and the bottom of the screw conveyor 2 are welded to the connecting seat 32 on the screw conveyor 2 and locked by a locking nut 34. The piston rod of the propulsion electric cylinder 33 drives the movement of the screw conveyor 2.

[0037] like Figure 1 As shown, in this embodiment, the elbow 12 is welded to the wall 6, the left side of the wall 6 is the sealed feeding device, and the right side of the wall 6 is the reactor 4. Welding the elbow 12 to the wall 6 can ensure the stability of the entire feeding pipe 1.

[0038] In the prior art, a certain pressure is generated inside the reactor 4. The feed pipe 1 is connected to the reactor 4, and the reactor 4 applies this pressure to the raw material, generating a certain resistance to the transport of the raw material to the reactor 4. Generally speaking, the resistance generated by the reactor 4 is 5000 Pa. At the same time, the elbow 12 has a certain inclination. When the raw material is transported from the straight pipe 11 through the elbow 12 to the reactor 4, it will also be subject to the raw material's own gravity as resistance. Under the action of the resistance, the advancement of the screw conveyor 2 will cause the raw material to be continuously squeezed, not only discharging the air in the raw material, but also discharging the moisture in the raw material, thereby reducing the water content of the raw material. Therefore, the sealed feeding device of the present embodiment can be used to squeeze and drain the raw material with a water content of no more than 70%, and then transport it into the reactor 4 and use it for dry anaerobic fermentation.

[0039] In the prior art, the feeding devices currently used for dry anaerobic fermentation are generally divided into two types, one is to use an injection pump to feed, and the other is to use a screw feeder inserted below the liquid level 41 in the tank. These two feeding devices will cause the air in the raw material to enter the reactor 4 together with the raw material during feeding, causing the anaerobic environment in the tank to be destroyed and the material in the tank to become acidified; at the same time, the biogas in the tank will also leak from the feed port 23 during feeding, which may cause poisoning or environmental pollution, and the injection pump is expensive and difficult to maintain. Even if a horizontal dry anaerobic fermentation reactor 4 feeding and discharging and reflux system such as patent application number CN202210521804.0 can prevent biogas in the reactor 4 from escaping to the feed side through the spiral, when the feeding screw conveyor 2 is inserted below the liquid level 41 of the reactor 4, the liquid in the reactor 4 needs to decompose the dry material, making the liquid in the reactor 4 have strong corrosiveness, and is in contact with the liquid in the reactor 4 for a long time, which easily corrodes the feeding screw conveyor 2, so that the number of times the screw conveyor 2 is maintained is long, which reduces production efficiency. At the same time, this type of screw machine feeding, which is inserted below the liquid level 41 in the tank, uses the gravity of the raw material itself as power. Since the screw machine is inserted below the liquid level 41 in the tank when feeding, the screw machine only serves to transport the raw materials, and does not have the function of squeezing the raw materials to expel moisture and air from the raw materials.

[0040] The sealed feeding device adopted in this embodiment is different from the structure of the prior art. The screw conveyor 2 of this embodiment moves only in the straight pipe 11. The movement of the screw conveyor 2 can squeeze the raw material and push the raw material into the reactor 4. The screw conveyor 2 outputs a thrust to push the raw material into the curved pipe 12 and the reactor 4. Secondly, by setting the structure of the feed pipe 1 to be divided into two parts, the straight pipe 11 and the curved pipe 12, the curved pipe 12 is inclined relative to the straight pipe 11. When the raw material moves on the curved pipe 12, the gravity of the raw material itself and the pressure of the reactor 4 itself are used as resistance during feeding. The resistance and thrust are used to squeeze the raw material together, so that the raw material is continuously squeezed out of water and air during the feeding process, so as to achieve the effect of simultaneously draining the water of the raw material and discharging the air in the raw material. At this time, the pressure generated on the raw material in the reactor 4 mainly comes from the resistance of the gas (such as biogas) in the reactor 4. The thrust of the screw conveyor 2 is greater than the resistance. One side of the screw conveyor 2 squeezes the raw material so that the gas in the reactor 4 does not escape to the other side of the screw conveyor 2.

[0041] Secondly, the screw conveyor 2 only moves in the straight pipe 11 and does not need to contact the liquid surface 41 in the reactor 4, which reduces corrosion to the screw conveyor 2 and further reduces the maintenance frequency of the screw conveyor 2, thereby improving production efficiency.

[0042] At the same time, the screw conveyor 2 will discharge the moisture in the raw materials while squeezing the raw materials. Therefore, the raw materials are not necessarily dry materials. The standards for selecting raw materials can be appropriately improved, that is, the raw materials can be placed in the sealed feeding device of this embodiment and conveyed to the reactor 4 when the moisture content is not more than 70%. At the same time, the moisture in the raw materials is discharged, so that the raw materials are in a dry material state when entering the reactor 4, thereby achieving the purpose of dry anaerobic fermentation reaction when the raw materials enter the reactor 4.

[0043] Moreover, for materials of different types and densities, the screw conveyor 2 can adjust the position and thrust of the screw conveyor 2 in the feed pipe 1 based on the feedback information from the pressure sensor 5, which can directly represent the thrust value of the screw conveyor 2. This allows the raw material pressure in the feed pipe 1 to meet the requirements for discharging moisture and air, and ensures that the gas in the reactor 4 does not overflow from one side of the screw conveyor 2.

[0044] How to use this embodiment

[0045] The raw materials enter from the feed port 23 of the screw conveyor, and under the action of the thrust shaft 21 and the variable pitch spiral blades 22, the raw materials are output from the discharge end and enter the straight pipe 11. The raw materials are subjected to the resistance of the bend 12 of the feed pipe 1, the reverse pressure formed by the air pressure in the tank, and the gravity of the raw materials themselves. At this time, the raw materials are gradually accumulated in the feed pipe 1 under the action of these forces. As the raw materials continue to accumulate in the feed pipe 1, foreign air will remain between the raw materials. The raw materials are squeezed by the thrust and resistance of the screw conveyor 2, and the foreign air will be continuously discharged; until the raw materials accumulate to a certain state and the thrust is greater than the resistance of the raw materials, the raw materials enter the reactor 4 from the connection between the bend 12 and the reactor 4, completing the feeding and effectively preventing the residual air in the raw materials from entering the reactor 4, thereby protecting the anaerobic environment in the reactor 4.

[0046] Moreover, the types of raw materials are numerous and complex, and the air content between different raw materials is different. When the air in the raw materials is discharged, the compression volume is different, and the required thrust is different. The air pressure in the tank remains unchanged. When different raw materials enter the screw conveyor 2, the compression amount is different. At this time, the pressure sensor 5 at the left end of the thrust shaft 21 of the screw conveyor 2 feeds back to the propulsion cylinder 33 according to the set parameters. The propulsion cylinder 33 adjusts the position of the screw conveyor 2, increases or decreases the raw material accommodation space between the screw conveyor 2 and the inside of the feed pipe 1, and better squeezes out the air in the material.

[0047] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the product of the present invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0048] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0049] It should be understood that the term "and / or" as used herein is simply a term used to describe the existence of three possible relationships between related objects. For example, "A and / or B" can represent the existence of A alone, the existence of both A and B, and the existence of B alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0050] Although the subject matter has been described in language specific to structural features and / or methodological logical acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims.

[0051] The above is only an embodiment of the present utility model. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the scope of protection of the utility model. These will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A sealed feeding device for dry anaerobic fermentation, comprising a workbench and a screw conveyor, wherein the screw conveyor is fixedly mounted on the workbench, characterized in that: It also includes a feed pipe with an obtuse-angle structure, one end of which is connected to a reactor for dry anaerobic fermentation, and the other end is connected to the discharge end of a screw conveyor. The screw conveyor moves axially along the other end of the feed pipe; the end of the feed pipe connected to the reactor is higher than the position of axial movement of the screw conveyor; the connection between the feed pipe and the reactor is located at the top of the reactor.

2. A sealed feeding device for dry anaerobic fermentation according to claim 1, characterized in that: The feed pipe includes a straight pipe and a curved pipe, and the straight pipe and the curved pipe are fixedly connected; The straight pipe is coaxially arranged with the screw conveyor; the curved pipe has an obtuse angle structure with a circular arc.

3. A sealed feeding device for dry anaerobic fermentation according to claim 2, characterized in that: It also includes a sealing ring, which is located in the feed pipe, with an outer ring of the sealing ring pressed against the inner surface of the feed pipe and an inner ring pressed against the outer surface of the screw conveyor.

4. A sealed feeding device for dry anaerobic fermentation according to claim 2, characterized in that: The length of the elbow is 600 mm.

5. A sealed feeding device for dry anaerobic fermentation according to any one of claims 1 to 4, characterized in that: The feeding pipe has an obtuse angle structure, and the obtuse angle is 150°.

6. A sealed feeding device for dry anaerobic fermentation according to claim 1, characterized in that: A pressure sensor is provided at one end of the screw conveyor away from the feed pipe.

7. The sealed feeding device for dry anaerobic fermentation according to claim 1, characterized in that: It includes a propulsion electric cylinder; the propulsion electric cylinder is fixedly installed on the workbench, the propulsion electric cylinder is connected to the screw conveyor, and the propulsion electric cylinder is used to push the screw conveyor to perform axial movement in the feed pipe.

8. The sealed feeding device for dry anaerobic fermentation according to claim 1, characterized in that: The screw conveyor includes a feed port which is circular and has a diameter of 650 mm.

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