Scum removing device for large straw biogas project

Abstract

The utility model discloses a scum removing device for a large straw biogas project, which relates to the technical field of biogas project facilities and comprises a stirring shaft arranged at the top of a fermentation tank and deviating from the center by a preset distance, a motor is arranged at the top of the stirring shaft, and the motor is in transmission connection with the stirring shaft through a speed reducer; a transverse compensator is arranged at the upper part of the stirring shaft and above the liquid level in the fermentation tank, stirring teeth are arranged on the transverse compensator, and the lower parts of the stirring teeth extend below the liquid level in the fermentation tank; stirrers are arranged at the bottoms of the stirring shafts; the stirrer is used for stirring and breaking shells of scum and materials at the lower part of the fermentation tank and pushing the scum at the lower part to the upper part of the fermentation tank; the transverse compensator is used for driving the stirring teeth to rotate; the stirring teeth are used for breaking shells of scum at the upper part of the fermentation tank. According to the utility model, the technical problem that the material input is influenced by scum and top material crusting in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of biogas engineering facilities, and particularly relates to a floating dregs eliminating device for large straw biogas engineering. BACKGROUND

[0002] At present, with the state gradually paying attention to the harmless and resource utilization of agricultural and forestry wastes (straw, livestock and poultry manure, etc.), the biogas anaerobic fermentation engineering has entered a period of rapid development. In the operation process of the biogas engineering, the floating dregs in the fermentation tank is an important factor affecting the fermentation of the fermentation system, gas production and the safety of system operation. The central stirring system mainly changes the flow field of the system through the stirring system, and at the same time, the whole floating dregs is crushed by using the metal material stirring device. The central stirring can crush the whole floating dregs with crust to promote the fermentation material and microorganisms to be in a completely mixed state, increase the contact area of the raw materials and microorganisms, promote the anaerobic fermentation process, and the central stirring system is the most core system for removing the crust floating dregs to ensure the stable operation of the biogas fermentation system. Especially in the straw biogas engineering, due to the low specific gravity and strong hydrophobicity of the straw, the stirring system plays a crucial role. However, the stirring system in the current straw biogas engineering in China has the following problems: the floating dregs and the top material crust affect the normal operation of the equipment and process, affect the input of the material, reduce the fermentation efficiency of the material, reduce the gas production efficiency of the material, reduce the tank capacity and reduce the volumetric gas production rate. SUMMARY

[0003] The utility model discloses a floating dregs eliminating device for large straw biogas engineering.

[0004] In a first aspect, the utility model discloses a floating dregs eliminating device for large straw biogas engineering, which is applied to the fermentation tank of the straw biogas engineering. The device comprises a stirring shaft arranged at a preset distance from the center of the top of the fermentation tank, a motor arranged at the top of the stirring shaft, and a speed reducer connecting the motor and the stirring shaft. A horizontal compensator is arranged above the liquid level in the upper part of the stirring shaft and the inside of the fermentation tank. A stirring tooth is arranged on the horizontal compensator, and the lower part of the stirring tooth extends below the liquid level in the fermentation tank. A stirrer is arranged at the bottom of the stirring shaft. The stirrer is used to stir and break the crust of the floating dregs and the material in the lower part of the fermentation tank, and to push the floating dregs in the lower part to the upper part of the fermentation tank. The horizontal compensator is used to drive the stirring tooth to rotate. The stirring tooth is used to break the crust of the floating dregs in the upper part of the fermentation tank.

[0005] Further, the stirring shaft is arranged through the top of the fermentation tank, and the motor and the speed reducer are arranged outside the top of the fermentation tank.

[0006] Further, the mounting base is arranged outside the top of the fermentation tank, a rack is arranged on the mounting base, the rack is arranged on the top of the speed reducer, and the motor is arranged on the side of the speed reducer; a shaft coupling is connected below the speed reducer, and the shaft coupling is connected with the stirring shaft below.

[0007] Further, a tank opening flange assembly is arranged on the inner wall of the top of the fermentation tank, and the tank opening flange assembly is connected with the mounting base through a tank opening flange reinforcing assembly.

[0008] Further, the impeller direction of the stirrer is arranged perpendicularly to the extension direction of the transverse compensator.

[0009] Further, the sweeping area of the transverse compensator is not less than half of the top plane area of the fermentation tank.

[0010] Further, the arrangement mode of the stirring teeth on the transverse compensator comprises: being asymmetrically arranged on both sides with the center of the transverse compensator as a boundary.

[0011] Further, the stirring teeth and the transverse compensator are connected through bolts.

[0012] Further, the transverse compensator is a hollow structure and is made of stainless steel.

[0013] Further, the stirrer is a hollow quadrangular prism structure, and the island-shaped blade is arranged on the side of the hollow quadrangular prism structure.

[0014] The floating slag elimination device for large straw biogas engineering provided by the utility model has the advantages that: the problems of floating slag and top material crust in the straw biogas engineering are solved, and the feeding difficulty is relieved; the gas production efficiency of the material is improved, and the gas production potential of the material is fully utilized; the problems of tank capacity reduction and volume gas production rate reduction are eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 A side view of the floating slag elimination device for large straw biogas engineering provided by the utility model embodiment is provided.

[0017] Figure 2The utility model provides a kind of top view of the floating dross elimination device of large-scale straw biogas engineering according to the utility model embodiment.

[0018] In the drawing: 1, stirring shaft, 2, motor, 3, speed reducer, 4, transverse compensator, 5, stirring tooth, 6, stirrer, 7, mounting bottom plate, 8, rack, 9, shaft coupling, 10, water seal outer sleeve, 11, tank mouth flange assembly, 12, tank mouth flange reinforcement assembly. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0020] Figure 1 It is a side view of the floating dross elimination device of large-scale straw biogas engineering according to the utility model embodiment, Figure 2 It is a top view of the floating dross elimination device of large-scale straw biogas engineering according to the utility model embodiment, and the device is applied to the fermentation tank of straw biogas engineering.

[0021] As shown in Figure 1 and Figure 2 , the device comprises: a stirring shaft 1 arranged at a top of the fermentation tank and deviated from a central position by a preset distance, a motor 2 arranged at a top of the stirring shaft 1, and the motor 2 and the stirring shaft 1 connected in transmission through a speed reducer 3; a transverse compensator 4 arranged at an upper portion of the stirring shaft 1 and above a liquid level in the fermentation tank, a stirring tooth 5 arranged on the transverse compensator 4, and a lower portion of the stirring tooth 5 extended below the liquid level in the fermentation tank; and a stirrer 6 arranged at a bottom of the stirring shaft 1.

[0022] Specifically, the stirrer 6 is used for stirring and breaking the floating dross and material in the lower portion of the fermentation tank, and pushing the floating dross in the lower portion to the upper portion of the fermentation tank.

[0023] The transverse compensator 4 is used for driving the stirring tooth 5 to rotate.

[0024] The stirring tooth 5 is used for breaking the floating dross in the upper portion of the fermentation tank.

[0025] Preferably, the motor 2 comprises a variable-frequency explosion-proof motor.

[0026] Preferably, the device provided in this embodiment of the present invention is designed for situations where scum is formed, i.e., the upper part of the scum is large and the scum is dry. For materials that are prone to scum formation, a 6.7m long transverse compensator 4 is installed at a position 0.46m to the left of the center of the fermentation tank at a liquid level height of 1-2m above the top of the material. When the transverse compensator 4 is operating normally, it is at the liquid level.

[0027] In this embodiment of the invention, since the top of the fermentation tank is supported by a steel structure and the center is a steel beam of the top fermentation tank steel structure, which cannot be opened, the invention sets the transverse compensator 4 at the left side of the top of the fermentation tank, which can facilitate inspection and maintenance through the opening at the top.

[0028] Preferably, to reduce energy consumption and decrease the load on motor 2, the lateral compensator 4 is a hollow structure; optionally, the diameter of the lateral compensator 4 is 133mm, the wall thickness is 10mm, and the length is configured in conjunction with the tank design. Under normal operation, to avoid corrosion, the lateral compensator 4 is made of stainless steel.

[0029] Preferably, in order to improve the scum removal effect, the sweeping area of ​​the transverse compensator 4 is not less than half of the top plane area of ​​the fermenter.

[0030] Preferably, the arrangement of the stirring teeth 5 on the transverse compensator 4 includes: asymmetrical arrangement on both sides with the center of the transverse compensator 4 as the boundary.

[0031] In one optional embodiment of this utility model, the net distance between the stirring teeth 5 on the transverse compensator 4 is 500mm; in order to improve the shell-breaking effect of the stirring teeth 5, the stirring teeth 5 are arranged asymmetrically on both sides of the transverse compensator 4, so as to increase the effective contact points between the stirring teeth 5 and the scum layer.

[0032] As the main component for removing solid scum from the liquid surface and above it, the stirring tooth 5 has a vertical angle of 45 degrees with the lateral compensator 4 to reduce stress and improve its service life.

[0033] Preferably, during normal operation, about 50% of the length of the stirring teeth 5 is below the liquid surface and scum. When there is a lot of scum, the length of the stirring teeth 5 above the liquid surface and scum can be increased by indicating the liquid level height, thereby improving the scum removal effect.

[0034] Preferably, the stirring teeth 5 and the transverse compensator 4 are connected by bolts, which facilitates loading and unloading during inspection and maintenance.

[0035] Specifically, such as Figure 1 As shown, the stirring shaft 1 is installed through the top of the fermentation tank, and the motor 2 and the reducer 3 are installed on the outside of the top of the fermentation tank.

[0036] Specifically, the mounting base plate 7 is arranged outside the top of the fermentation tank, the rack 8 is arranged on the mounting base plate 7, the speed reducer 3 is arranged on the top of the rack 8, and the motor 2 is arranged on the side of the speed reducer 3; the speed reducer 3 is connected with the shaft coupling 9 below, and the shaft coupling 9 is connected with the stirring shaft 1 below.

[0037] Preferably, the mounting base plate 7 is a rectangular base plate.

[0038] Preferably, as shown in the drawings, Figure 1 The water seal sleeve 10 is further arranged at the connecting position between the mounting base plate 7 and the stirring shaft 1.

[0039] Specifically, as shown in the drawings, Figure 1 The tank opening flange assembly 11 is arranged on the inner wall of the top of the fermentation tank, and the tank opening flange assembly 11 is connected with the mounting base plate 7 through the tank opening flange reinforcing assembly 12.

[0040] Preferably, the tank opening flange assembly 11 is composed of a flange, a rib plate and a connecting pipe; and the tank opening flange reinforcing assembly 12 is composed of an I-beam, a vertical rib, a coaming and a rib plate.

[0041] Preferably, the tank opening flange reinforcing assembly 12 and the mounting base plate 7 are connected through bolts.

[0042] Preferably, as shown in the drawings, Figure 2 The impeller direction of the stirrer 6 is arranged perpendicularly to the extension direction of the transverse compensator 4.

[0043] Preferably, the stirrer 6 is a hollow quadrangular prism structure, and the island-shaped structure blades are arranged on the side of the hollow quadrangular prism structure.

[0044] In the embodiment of the utility model, the device is increased with 3000mm stirring device 6, hollow quadrangular prism structure, blade island structure. Among them, the stirring effect of stirring device 6 includes: 1) the lower part of the relatively wet, less range of dregs and the dregs of the material that will float are stirred and broken; 2) the flow field effect generated by the operation mode of this stirring device is to lift the lower material to the upper part of the stirring device, which helps to push the lower dregs and the material that will float to the stirring teeth for stirring and breaking.

[0045] In the embodiment of the utility model, the whole device is supported by the top of the fermentation tank, so that the fermentation tank material and the strain do not need to be emptied when the device is inspected and maintained, and the tank strain culture and debugging do not need to be performed again when the device is inspected and maintained.

[0046] As can be seen from the above description, the utility model provides a dregs eliminating device for large straw biogas engineering, and has the following beneficial effects compared with the prior art:

[0047] (1) the asymmetric stirring teeth are arranged on the transverse compensator, floating dregs and crusts are broken through stirring, the contact area of the fermentation liquid and the crust material is promoted, the fermentation liquid and the crust material are mixed, homogenized and degraded through stirring, and the floating dregs under the liquid surface are lifted to the contact area of the stirring teeth through the stirring effect of the lower stirrer, the problems of floating dregs and top material crust in the straw biogas engineering are solved, and the problem of difficult feeding is relieved;

[0048] (2) the floating dregs and crusts are dried, and the microorganisms in the fermentation liquid cannot contact the raw materials in the floating dregs and crusts, the device provided by the utility model releases the raw materials in the floating dregs and crusts, and the raw materials are fermented and gasified after contacting the microorganisms in the fermentation liquid, so that the gasification efficiency of the materials is improved, and the gasification potential of the materials is fully utilized;

[0049] (3) because the floating dregs and crusts occupy the volume of the fermentation tank, the floating dregs and crusts cannot produce gas, and belong to invalid gas production area, the device provided by the utility model breaks the floating dregs and crusts, releases the floating dregs and crusts area, and becomes an effective gas production area, so that the problems of reducing the tank capacity and reducing the volume gas production rate are eliminated.

[0050] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0051] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A floating sludge removing device for a large-scale straw biogas project, characterized in that, The application discloses a fermentation tank applied to a straw biogas engineering, which comprises a stirring shaft arranged at a top of the fermentation tank and deviated from a center position by a preset distance, a motor arranged at a top of the stirring shaft, and a speed reducer connected with the stirring shaft through transmission. The stirring shaft is provided with a stirrer at a bottom thereof, and the stirrer is used for stirring and breaking a shell of upper scum and materials in the fermentation tank and pushing the upper scum to an upper portion of the fermentation tank. The transverse compensator is used for driving the stirring teeth to rotate. The stirring teeth are used for breaking a shell of the upper scum in the fermentation tank.

2. The scum elimination device for a large-scale straw methane project according to claim 1, characterized in that: The stirring shaft is arranged through the top of the fermentation tank, and the motor and the speed reducer are arranged outside the top of the fermentation tank.

3. The scum elimination device for a large-scale straw methane project according to claim 2, characterized in that: An installation base plate is arranged outside the top of the fermentation tank, a rack is arranged on the installation base plate, the speed reducer is arranged at a top of the rack, and the motor is arranged at a side of the speed reducer.

4. The scum elimination device for a large-scale straw methane project according to claim 3, characterized in that: A shaft coupling is connected below the speed reducer, and the stirring shaft is connected below the shaft coupling.

5. The scum elimination device for a large-scale straw methane project according to claim 1, characterized in that: A tank opening flange assembly is arranged on an inner wall of the top of the fermentation tank, and the tank opening flange assembly is connected with the installation base plate through a tank opening flange reinforcing assembly.

6. The scum elimination device for a large-scale straw methane project according to claim 1, characterized in that: A direction of the impeller of the stirrer is arranged perpendicularly to an extension direction of the transverse compensator.

7. The scum elimination device for a large-scale straw methane project according to claim 1, characterized in that: A sweeping area of the transverse compensator is not less than half of a top plane area of the fermentation tank.

8. The scum elimination device for a large-scale straw methane project according to claim 1, characterized in that: An arrangement mode of the stirring teeth on the transverse compensator comprises that a center of the transverse compensator is taken as a boundary, and both sides are arranged asymmetrically.

9. The scum eliminating device for large-scale straw methane engineering according to claim 1, characterized in that: The stirring teeth and the transverse compensator are connected through bolts.

10. The scum elimination device for a large-scale straw methane project according to claim 1, characterized in that: The transverse compensator is a hollow structure and is made of stainless steel. The stirrer is a hollow quadrangular prism structure, and island-shaped blades are arranged at side edges of the hollow quadrangular prism structure.

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