Internal circulation stirring device of large anaerobic fermentation tank and anaerobic fermentation tank

Abstract

The utility model provides an internal circulation stirring device of a large anaerobic fermentation tank and the anaerobic fermentation tank. The internal circulation stirring device of the large anaerobic fermentation tank is designed according to fluid mechanics and floating and sedimentation characteristics of materials. Under the pumping action of the pump body, unreacted organic matters in the upper-layer scum in the tank body are pumped into the pump body through the tank top liquid suction pipe, and / or materials at the bottom in the tank body are pumped into the pump body through the tank bottom liquid suction pipe. Unreacted organic matters in the upper-layer scum and / or bottom materials are discharged into the tank body through the liquid outlet pipe, so that the lower-layer materials are always in a suspended flow state, vertical circulation and internal circulation stirring of the materials in the tank body are realized, the contact time of a matrix and microorganisms is prolonged, the degradation rate of the organic matters is improved, and accumulation and crusting of the scum in the tank are reduced; sediment deposition in the tank body is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of anaerobic fermentation, and relates to a large-scale anaerobic fermentation tank internal circulation stirring device and the anaerobic fermentation tank. Background Art

[0002] Biogas is a combustible gas produced by microbial fermentation of organic matter in an anaerobic environment under certain temperature, humidity and pH conditions.

[0003] When using large anaerobic fermentation tanks to prepare biogas, the material stirring of the large anaerobic fermentation tank has an important impact on the anaerobic digestion effect. If the stirring and mixing effect is poor, it will greatly affect the anaerobic digestion effect, and then affect the biogas production. At present, it is common in China to place a stirrer on the top or side of a large anaerobic tank, and use the stirrer to force mechanical stirring of the material to promote the contact between the material and microorganisms for decomposition, and produce biogas, carbon dioxide and other trace gases.

[0004] For anaerobic fermentation tanks with larger tank volumes, it is necessary to deliberately increase the power of the mixer to improve the stirring effect, which results in high energy consumption for stirring. In addition, the top-entry mixer has a slow rotation speed and a relatively low linear speed. Deposits are prone to occur at the bottom of large anaerobic fermentation tanks, resulting in incomplete anaerobic digestion of materials and low degradation efficiency. Due to the characteristics of its structure, the side-entry mixer can only achieve horizontal layer material mixing, and cannot achieve the circulation of upper and lower materials. There is a problem of incomplete reaction of upper layer materials, resulting in a low degradation rate. Utility Model Content

[0005] The utility model aims to provide a large-scale anaerobic fermentation tank internal circulation stirring device and an anaerobic fermentation tank, so as to solve the problems that the existing large-scale anaerobic fermentation tank is easy to deposit mud and sand at the bottom and has a low degradation rate of organic matter when producing biogas.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides an internal circulation stirring device for a large anaerobic fermentation tank, comprising a tank top suction pipe, a tank bottom suction pipe and a liquid outlet pipe all connected with the tank body, wherein the tank top suction pipe, the tank bottom suction pipe and the liquid outlet pipe are all connected with a pump body; the tank top suction pipe is located above the tank bottom suction pipe and the liquid outlet pipe.

[0008] Preferably, valves are provided on the tank top suction pipe, the tank bottom suction pipe and the liquid outlet pipe.

[0009] Preferably, the valve is a one-way valve, wherein the one-way valve on the tank top suction pipe and the tank bottom suction pipe is opened from the tank top suction pipe or the tank bottom suction pipe toward the pump body; the one-way valve on the liquid outlet pipe is opened from the pump body toward the liquid outlet pipe.

[0010] Preferably, there is an angle between the liquid outlet of the liquid outlet pipe and the side wall of the tank body.

[0011] Preferably, the liquid suction pipe opening of the tank top liquid suction pipe is located below the upper liquid level of the tank body.

[0012] Preferably, the tank bottom suction pipe is arranged at the bottom of the tank body or the bottom of the side wall.

[0013] Preferably, the pump body comprises an axial flow pump.

[0014] The utility model also provides an anaerobic fermentation tank, comprising a tank body and a large-scale anaerobic fermentation tank internal circulation stirring device arranged on the tank body.

[0015] Preferably, a plurality of the large-scale anaerobic fermentation tank internal circulation stirring devices are evenly arranged around the tank body.

[0016] The utility model has the following beneficial effects:

[0017] The utility model provides an internal circulation stirring device for a large anaerobic fermentation tank and an anaerobic fermentation tank. The internal circulation stirring device for a large anaerobic fermentation tank is designed based on fluid mechanics and the floating and settling characteristics of the material itself. Under the suction action of the pump body, the unreacted organic matter in the upper layer of scum inside the tank body is pumped into the pump body through the tank top suction pipe, and / or the bottom material inside the tank body is pumped into the pump body through the tank bottom suction pipe. The unreacted organic matter in the upper layer of scum and / or the bottom material are discharged into the interior of the tank body through the liquid outlet pipe, so that the lower layer material is always in a suspended state, realizing the upper and lower circulation of the material inside the tank body and the internal circulation stirring, increasing the contact time between the substrate and the microorganisms, improving the degradation rate of organic matter, reducing the accumulation and crusting of scum in the tank, and preventing the sediment from depositing inside the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a circulating stirring device in a large anaerobic fermentation tank provided in an embodiment of the present application;

[0019] Figure 2 A top view of an anaerobic fermentation tank provided in an embodiment of the present application;

[0020] Symbols represent:

[0021] 1-tank body, 2-tank top suction pipe, 3-tank bottom suction pipe, 4-liquid outlet pipe, 5-pump body, 6-valve, a-large anaerobic fermentation tank internal circulation stirring device. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Please refer to the attached Figure 1 , attached Figure 1 The schematic diagram of the structure of the internal circulation stirring device of the large anaerobic fermentation tank provided in the embodiment of the present application is shown. Figure 1 It can be seen that the internal circulation stirring device of the large anaerobic fermentation tank provided in the embodiment of the present application includes a tank top suction pipe 2, a tank bottom suction pipe 3 and a liquid outlet pipe 4, which are all connected to the tank body 1, and the tank top suction pipe 2, the tank bottom suction pipe 3 and the liquid outlet pipe 4 are also connected to the pump body 5. Thus, the tank body 1, the tank top suction pipe 2, the tank bottom suction pipe 3, the liquid outlet pipe 4 and the pump body 5 form a connected structure. The tank top suction pipe 2, the tank bottom suction pipe 3 and the liquid outlet pipe 4 are all pipe body structures. The tank top suction pipe 2 is located above the tank bottom suction pipe 3 and the liquid outlet pipe 4.

[0024] Specifically, the tank top suction pipe 2 is arranged on one side of the tank body 1, and its suction pipe opening is located below the upper liquid level of the tank body 1. The tank top suction pipe 2 is used to suck the unreacted organic matter in the upper layer of scum inside the tank body 1, and discharge the organic matter into the pump body 5. The tank bottom suction pipe 3 is arranged at the bottom of the tank body 1 or the bottom of the side wall, and is used to suck the bottom material inside the tank body 1, and discharge the bottom material into the pump body 5. The liquid outlet pipe 4 is arranged at the bottom of the side wall of the tank body 1, and is used to continuously spray the material sucked by the pump body 5 into the interior of the tank body 1, so as to promote the mixing and mass transfer of the materials inside the tank body 1. The pump body 5 is a component for extracting the unreacted organic matter and the bottom material in the upper layer of scum from the inside of the tank body 1, and discharging the mixed material, which provides effective kinetic energy for the fermentation and mass transfer of the materials inside the tank body 1. Preferably, the pump body 5 includes an axial flow pump.

[0025] Under the suction action of the pump body 1, the unreacted organic matter in the upper layer of scum inside the tank body 1 is sucked into the pump body 1 through the tank top suction pipe 2, and / or the bottom material inside the tank body 1 is sucked into the pump body 1 through the tank bottom suction pipe 3. Finally, the unreacted organic matter in the upper layer of scum and / or the bottom material are discharged into the tank body 1 through the liquid outlet pipe 4, so that the material inside the tank body 1 can be circulated up and down, the contact time between the substrate and the microorganisms is increased, and the degradation rate of the organic matter is increased, and the phenomenon of accumulation and crusting of scum in the tank can also be reduced. In the process of discharging from the liquid outlet pipe 4 to the inside of the tank body 1, the material inside the tank body 1 will form a plug flow effect, achieving the effect of stirring, and at the same time, it can also increase the contact time between the substrate and the microorganisms.

[0026] There is an angle between the liquid outlet of the liquid outlet pipe 4 and the side wall of the tank body 1. The setting of the angle enables the material inside the pump body 1 to be discharged into the tank body 1 through the liquid outlet pipe 4 at a certain angle, so that the lower layer of material is always in a suspended state, further achieving the purpose of stirring, and at the same time can effectively prevent sediment from being deposited inside the tank body 1.

[0027] In addition, since the tank top suction pipe 2 is located at a higher position, the unreacted organic matter in the upper layer of scum extracted from the tank body 1 by the tank top suction pipe 2 has a certain potential energy. Under the action of the organic matter's own gravity, it can provide a certain kinetic energy for the pump body 5, which can reduce the power of the pump body 1 and minimize the energy consumption of the internal circulation stirring.

[0028] Furthermore, in order to control the flow direction and opening and closing of the materials in the tank top suction pipe 2, the tank bottom suction pipe 3 and the liquid outlet pipe 4, valves 6 are provided on the tank top suction pipe 2, the tank bottom suction pipe 3 and the liquid outlet pipe 4. Preferably, the valve 6 is a one-way valve. That is, the one-way valve on the tank top suction pipe 2 opens from the tank top suction pipe 2 to the pump body 5, the one-way valve on the tank bottom suction pipe 3 opens from the tank bottom suction pipe 3 to the pump body 5, and the one-way valve on the liquid outlet pipe 4 opens from the pump body 5 to the liquid outlet pipe 4.

[0029] Please refer to the attached Figure 2 , attached Figure 2 1 shows a top view of the anaerobic fermentation tank provided in the embodiment of the present application. Figure 1 It can be seen that the anaerobic fermentation tank provided in the embodiment of the present application includes a tank body 1 and a large anaerobic fermentation tank internal circulation stirring device a arranged on the tank body 1, and the large anaerobic fermentation tank internal circulation stirring device a is an attached Figure 1 The internal circulation stirring device shown.

[0030] Furthermore, a plurality of large-scale anaerobic fermentation tank internal circulation stirring devices a are evenly arranged around the tank body 1 to facilitate uniform stirring of the material inside the tank body. The angle between the liquid outlet of the liquid outlet pipe 4 and the side wall of the tank body 1 is specifically set according to the number of large-scale anaerobic fermentation tank internal circulation stirring devices a and the material inside the tank body 1.

[0031] In addition, the internal circulation stirring device a of the large anaerobic fermentation tank provided in the embodiment of the present application can also be applied to other large equipment that requires stirring to improve the stirring capacity of the large equipment.

[0032] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A large-scale anaerobic fermentation tank internal circulation stirring device, characterized in that: The invention comprises a tank top suction pipe (2), a tank bottom suction pipe (3) and a liquid outlet pipe (4) which are all connected to the tank body (1); the tank top suction pipe (2), the tank bottom suction pipe (3) and the liquid outlet pipe (4) are all connected to a pump body (5); and the tank top suction pipe (2) is located above the tank bottom suction pipe (3) and the liquid outlet pipe (4).

2. The large-scale anaerobic fermentation tank internal circulation stirring device according to claim 1 is characterized in that: Valves (6) are provided on the tank top liquid suction pipe (2), the tank bottom liquid suction pipe (3) and the liquid outlet pipe (4).

3. The internal circulation stirring device of the large-scale anaerobic fermentation tank according to claim 2 is characterized in that: The valve (6) is a one-way valve, wherein the one-way valve on the tank top suction pipe (2) and the tank bottom suction pipe (3) is opened from the tank top suction pipe (2) or the tank bottom suction pipe (3) in the direction of the pump body (5); and the one-way valve on the liquid outlet pipe (4) is opened from the pump body (5) in the direction of the liquid outlet pipe (4).

4. The internal circulation stirring device of the large-scale anaerobic fermentation tank according to claim 1 is characterized in that: There is an angle between the liquid outlet of the liquid outlet pipe (4) and the side wall of the tank body (1).

5. The internal circulation stirring device of the large-scale anaerobic fermentation tank according to claim 1 is characterized in that: The liquid suction pipe opening of the tank top liquid suction pipe (2) is located below the upper liquid level of the tank body (1).

6. The internal circulation stirring device of the large-scale anaerobic fermentation tank according to claim 1 is characterized in that: The tank bottom liquid suction pipe (3) is arranged at the bottom of the tank body (1) or at the bottom of the side wall.

7. The internal circulation stirring device of the large-scale anaerobic fermentation tank according to claim 1 is characterized in that: The pump body (5) comprises an axial flow pump.

8. An anaerobic fermentation tank, characterized in that: It comprises a tank body (1) and a large-scale anaerobic fermentation tank internal circulation stirring device (a) as claimed in any one of claims 1 to 7, which is arranged on the tank body (1).

9. The anaerobic fermentation tank according to claim 8, characterized in that: A plurality of large-scale anaerobic fermentation tank internal circulation stirring devices (a) are evenly arranged around the tank body (1).

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