A straw fermentation device for reducing crusting rate

Abstract

The present invention relates to a straw fermentation device for reducing the crusting rate, comprising a cylinder body and a cover body with an open top, a rectangular fermentation tank is arranged inside the cylinder body, the outer wall of the fermentation tank and the inner wall of the cylinder body are divided into a sediment area and a liquid collection area by a guide slope, and a liquid collection port is arranged at the lower end of the guide slope, and a filter is arranged at the liquid collection port; a pair of scrapers are connected to the bottom of the cover body, and the two ends of the scraper in the length direction are respectively abutted against the two opposite side walls of the fermentation tank, and the bottom of the scraper is lower than the liquid level of the fermentation tank, and a driving mechanism is arranged on the cover body, and the two scrapers can be synchronously moved away from or approached to each other under the action of the driving mechanism; a water pump is also arranged in the liquid collection area, and a return port connected to the water pump is arranged on the side of the fermentation tank. The present invention adopts a scraper to scrape off the scum, which can effectively prevent the scum from floating up and crusting again. In addition, an air guide pipe is arranged in the fermentation tank, which is conducive to the smooth discharge of biogas and improves the gas production rate.

Description

Technical Field

[0001] The invention relates to the technical field of straw fermentation devices, and in particular to a straw fermentation device capable of reducing a crusting rate. Background Art

[0002] Anaerobic fermentation of biogas is carried out with straw as the main material. When the fermentation tank is in a static state, the straw raw material floats due to its large volume and small specific gravity. After the straw raw material slag floats above the liquid surface of the fermentation tank, it is difficult to be decomposed for a long time. The straw raw material gradually lacks water, shrinks and forms a crust.

[0003] A large amount of straw raw materials float up and form crusts, which directly leads to the inability to discharge the biogas produced in the fermentation tank smoothly. It can only gather in the lower part of the crust layer. A large amount of biogas is retained in the fermentation liquid. More carbon dioxide in the biogas dissolves in the fermentation liquid, causing the pH value of the fermentation liquid to decrease, thereby affecting gas production.

[0004] In order to improve the crusting phenomenon, technicians in this field have proposed to break up the crusting layer so that the crusted materials are dispersed and re-contacted with the fermentation liquid. However, the broken crusts still float above the fermentation liquid, which is not conducive to the overflow of biogas, and the risk of re-crusting still exists. Summary of the invention

[0005] In view of the defects in the prior art, the technical problem to be solved by the present invention is to provide a straw fermentation device with reduced crusting rate, which can scrape off the scum on the top of the fermentation tank to reduce the crusting rate, and an air duct is arranged in the fermentation tank to help the biogas to be discharged smoothly and increase the gas production rate.

[0006] In order to solve the above technical problems, the present invention provides a straw fermentation device for reducing the crusting rate, comprising a cylinder with an open top and a cover connected to the open top of the cylinder, a rectangular fermentation tank is arranged inside the cylinder, and a cavity is formed between the outer wall of the fermentation tank and the inner wall of the cylinder, and a guide slope is arranged at the lower part of the cavity, and the guide slope divides the cavity into a sediment area and a liquid collection area from top to bottom, and a liquid collection port is arranged at the lower end of the guide slope, and a filter screen is arranged at the liquid collection port, and the sediment area and the liquid collection area are connected through the liquid collection port; a pair of scrapers are connected to the bottom of the cover, and the two ends of the scraper in the length direction are respectively connected to the two opposite side walls of the fermentation tank The bottom of the scraper is lower than the liquid level of the fermentation tank, and a driving mechanism is arranged on the cover body, and the two scrapers can move away from or approach each other synchronously under the action of the driving mechanism; a hollow air duct is arranged between the two scrapers, the bottom of the air duct is fixedly connected to the bottom wall of the fermentation tank, the top of the air duct extends out of the liquid level of the fermentation tank, a plurality of air holes are arranged on the side of the air duct, and a waterproof and breathable membrane is coated on the outer periphery of the air duct; a water pump is also arranged in the liquid collection area, and a water return port is arranged on the side of the fermentation tank, the water return port is higher than the liquid level of the fermentation tank, and the water return port is connected with the drain port of the water pump through a connecting pipe.

[0007] The present invention arranges a scraper on the top of the fermentation tank. In the actual application process, the driving mechanism can be controlled to work regularly to drive the scraper to move. When the driving mechanism drives the scrapers to move away from each other synchronously, the scrapers can push the straw scum floating on the liquid surface to move toward the boundary of the fermentation tank. As the scrapers gradually approach the side wall of the fermentation tank, the scum and part of the fermented liquid will be pushed by the scrapers to be discharged into the sediment area. Then the driving mechanism drives the scrapers to approach each other synchronously so that the scrapers are reset and wait for the next scraping of scum. The scum and fermented liquid falling into the sediment area move toward the liquid collection port under the action of the guide slope. Since a filter screen is arranged at the liquid collection port, the fermented liquid and the scum will be separated under the action of the filter screen, and the fermented liquid enters the liquid collection area through the filter screen, while the scum remains in the sediment area. The fermented liquid entering the liquid collection area will flow back to the fermentation tank from the return water port under the action of the water pump to prevent the loss of the fermented liquid. It can be seen that the present invention adopts a scraper to scrape off the scum, which can effectively prevent the scum from floating up and crusting again, and can fundamentally reduce the crusting rate. In addition, the present invention arranges an air duct in the fermentation tank, and the biogas generated in the fermentation tank can pass through the waterproof and breathable membrane into the interior of the air duct, which is conducive to the smooth discharge of the biogas and improves the gas production rate.

[0008] Preferably, the cross section of the air duct is a rounded rectangle; the opposite sides of the two scrapers abut against each other, and a notch is provided in the middle of the opposite sides of the scrapers, the notches of the two scrapers enclose to form a clearance portion that can accommodate the air duct, and the sides of the two scrapers away from each other are both flat. The air duct is designed as a rounded rectangle to facilitate the arrangement of the scrapers.

[0009] Preferably, the fermentation tank comprises two first side panels and two second side panels arranged opposite to each other, the bottoms of the first side panels and the second side panels are connected to the bottom wall of the cylinder, the top of the first side panel is higher than the top of the second side panel, and the two sides of the scraper in the length direction are respectively in contact with the two first side panels. The second side panel is designed to be higher than the first side panel, which can guide the scraper; during the movement of the scraper of the present invention, the scum will be pushed toward the direction of the second side panel, so that the scum is discharged from the top of the second side panel to the sediment area.

[0010] Preferably, the upper surface of the second side plate gradually slopes downward in a direction away from the scraper to facilitate smooth discharge of scum.

[0011] Preferably, the driving mechanism includes two driving components symmetrically arranged on both sides of the air guide tube, and the driving component includes a motor mounted on the cover body, the output shaft of the motor is fixedly connected to a bidirectional screw rod, and the outer periphery of the two threaded segments of the bidirectional screw rod is respectively threadedly connected to a nut, and the bottoms of the two nuts are respectively fixedly connected to the two scrapers through connecting rods.

[0012] Preferably, two grooves are provided on the top of the scraper, the two grooves are symmetrically distributed on both sides of the notch, and the connecting rod is connected in the corresponding grooves.

[0013] Preferably, the barrel is provided with a socket at a position corresponding to the liquid collection port, a plug plate is inserted into the socket, an opening is provided on the plug plate, and the filter screen is provided at the opening. With this structural design, it is convenient to take out the plug plate and replace the filter screen.

[0014] Preferably, supporting plates for supporting the plug board are arranged on both sides of the liquid collecting port to prevent the plug board from tilting.

[0015] Preferably, a handle is connected to the outer side of the plug board to facilitate pulling out the plug board. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0017] Figure 1 It is a structural schematic diagram of a straw fermentation device for reducing the crusting rate according to an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the connection structure of the cylinder and the scraper in an embodiment of the present invention;

[0019] Figure 3 Schematic diagram of the structure of the cylinder according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] 1-cylinder; 2-cover; 3-fermentation tank; 31-first side plate; 311-water return port; 32-second side plate; 4-flow guide slope; 41-sludge area; 42-liquid collection area; 43-support plate; 5-insert plate; 51-handle; 52-filter screen; 6-scraper; 61-groove; 7-water pump; 8-air guide pipe; 81-air vent; 82-waterproof breathable membrane; 9-drive assembly; 91-motor; 92-bidirectional screw rod; 93-nut; 94-connecting rod. DETAILED DESCRIPTION

[0022] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0023] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, the present embodiment discloses a straw fermentation device for reducing the crusting rate, comprising a cylinder 1 with an open top and a cover 2 connected to the open top of the cylinder 1, the cylinder 1 comprising a bottom plate and a cylindrical side plate, a rectangular fermentation tank 3 is arranged inside the cylinder 1, the outer wall of the fermentation tank 3 and the inner wall of the cylinder 1 enclose a cavity, a guide slope 4 is arranged at the lower part of the cavity, the guide slope 4 divides the cavity into a sediment area 41 and a liquid collection area 42, and a liquid collection port connecting the sediment area 41 and the liquid collection area 42 is arranged at the lower end of the guide slope 4, a socket is arranged at a position of the cylinder 1 corresponding to the liquid collection port, a plug board 5 is inserted in the socket, a handle 51 is connected to the side of the plug board 5 located outside the cylinder 1, an opening is also arranged on the plug board 5, and a filter screen 52 is arranged at the opening; in addition, supporting plates 43 for supporting the plug board 5 are arranged on both sides of the liquid collection port to prevent the plug board 5 from tilting.

[0025] The fermentation tank 3 comprises two first side panels 31 and two second side panels 32 which are arranged opposite to each other. The bottoms of the first side panels 31 and the second side panels 32 are connected to the bottom wall of the cylinder 1 , and the top of the first side panel 31 is higher than the top of the second side panel 32 .

[0026] A pair of scrapers 6 are connected to the bottom of the cover body 2, and the two ends of the scraper 6 in the length direction are respectively in contact with the two first side plates 31 of the fermentation tank. The bottom of the scraper 6 is lower than the liquid level of the fermentation tank 3, and a driving mechanism is provided on the cover body 2. The two scrapers 6 can move away from or approach each other synchronously under the action of the driving mechanism.

[0027] In this embodiment, a scraper 6 is arranged on the top of the fermentation tank 3. In actual application, the driving mechanism can be controlled to work regularly to drive the scraper 6 to move. When the driving mechanism drives the scrapers 6 to move away from each other synchronously, the scraper 6 can push the straw scum floating on the liquid surface to move toward the second side plate 32. As the scraper 6 and the corresponding second side plate 32 gradually approach each other, the scum and part of the fermented liquid will be pushed by the scraper 6 to be discharged into the sediment area 41. Then the driving mechanism drives the scrapers 6 to move toward each other synchronously so that the scraper 6 is reset and waits for the next scraping of the scum. The scum and fermented liquid falling into the sediment area 41 move toward the liquid collection port under the action of the guide slope 4. Since the filter screen 52 is arranged at the liquid collection port, the fermented liquid and the scum will be separated under the action of the filter screen 52. The fermented liquid enters the liquid collection area 42 through the filter screen 52, while the scum remains in the sediment area 41. In addition, in order to facilitate the smooth discharge of the scum, the upper surface of the second side plate 32 is designed to gradually tilt downward in the direction away from the scraper 6.

[0028] Furthermore, in this embodiment, a water pump 7 is arranged in the liquid collection area 42, and a water return port 311 is arranged on the upper part of the first side plate 31 of the fermentation tank 3, the water return port 311 is higher than the liquid level of the fermentation tank 3, and the water return port 311 is connected to the drain port of the water pump 7 through a connecting pipe. The water return port 311 gradually tilts upward in a direction away from the inside of the fermentation tank 3, so that the fermentation liquid entering the water return port 311 can naturally flow downward along the water return port 311 into the fermentation tank, and in order to facilitate the connection with the connecting pipe of the water pump, in this embodiment, a connecting section connected to the water return port 311 is protrudingly arranged on the outer side of the first side plate 31, and the connecting pipe is sleeved on the outer periphery of the connecting section. Then, the fermentation liquid entering the liquid collection area 42 will flow back from the water return port 311 to the fermentation tank 3 under the action of the water pump 7 to prevent the loss of the fermentation liquid.

[0029] Furthermore, a hollow air duct 8 is provided between the two scrapers 6, the bottom of the air duct 8 is fixedly connected to the bottom wall of the fermentation tank 3, the top of the air duct 8 extends out of the liquid surface of the fermentation tank 3, a plurality of air holes 81 are provided on the side of the air duct 8, and a waterproof air-permeable membrane 82 is coated on the outer periphery of the air duct 8. The waterproof air-permeable membrane 82 can prevent the fermentation liquid or scum from entering the air duct 8, but can allow the biogas generated in the fermentation tank to smoothly enter the air duct 8, so as to be discharged to the outside of the fermentation tank 3 along the air duct 8, which is conducive to the smooth discharge of the biogas.

[0030] Specifically, the cross-section of the air duct 8 is a rounded rectangle; the opposite sides of the two scrapers 6 are in contact with each other, and a notch is provided in the middle of the opposite sides of the scrapers 6, and the notches of the two scrapers 6 are enclosed to form a makeshift portion that can accommodate the air duct 8; the sides of the two scrapers 6 that are away from each other are both flat, and two grooves 61 are provided on the top of the scraper 6, and the two grooves are symmetrically distributed on both sides of the notch.

[0031] The driving mechanism includes two driving components 9 symmetrically arranged on both sides of the air guide tube 8. The driving component 9 includes a motor 91 installed on the cover body 2. The output shaft of the motor 91 is fixedly connected to a bidirectional screw 92. The outer periphery of the two threaded sections of the bidirectional screw 92 is respectively threadedly connected with a nut 93. The bottoms of the two nuts 93 are respectively fixedly connected to the two scrapers 6 through a connecting rod 94. Specifically, the connecting rod 94 is connected to the bottom wall of the corresponding groove 61. In actual application, the motor 91 can be controlled to start regularly to drive the bidirectional screw 92 to rotate. At this time, the nuts 93 on the same bidirectional screw 92 will move away from each other synchronously, thereby driving the two scrapers 6 to move away synchronously to scrape off the scum. In this embodiment, the two ends of the scraper 6 abut against the first side plate 31. Under the action of the two first side plates 31, it can be ensured that the scraper 6 does not deflect.

[0032] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, systems and techniques are not shown in detail so as not to obscure the understanding of this description.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, systems, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, systems, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A straw fermentation device for reducing the crusting rate, comprising a cylinder with an open top and a cover connected to the open top of the cylinder, characterized in that: A rectangular fermentation tank is arranged inside the cylinder, and a cavity is formed between the outer wall of the fermentation tank and the inner wall of the cylinder. A guide slope is arranged at the lower part of the cavity, and the guide slope separates the cavity into a sediment area and a liquid collection area from top to bottom, and a liquid collection port is arranged at the lower end of the guide slope, and a filter screen is arranged at the liquid collection port, and the sediment area and the liquid collection area are connected through the liquid collection port; A pair of scrapers are connected to the bottom of the cover, and the two ends of the scrapers in the length direction are respectively in contact with the two opposite side walls of the fermentation tank, and the bottom of the scrapers is lower than the liquid level of the fermentation tank. A driving mechanism is provided on the cover, and the two scrapers can synchronously move away from each other or synchronously approach each other under the action of the driving mechanism. A hollow air duct is arranged between the two scrapers, the bottom of the air duct is fixedly connected to the bottom wall of the fermentation tank, the top of the air duct extends out of the liquid surface of the fermentation tank, a plurality of air holes are arranged on the side of the air duct, and a waterproof and breathable film is coated on the periphery of the air duct; A water pump is also arranged in the liquid collecting area, and a water return port is arranged on the side of the fermentation tank. The water return port is higher than the liquid level of the fermentation tank, and the water return port is connected with the drainage port of the water pump through a connecting pipe.

2. A straw fermentation device for reducing crusting rate according to claim 1, characterized in that: The cross section of the air guide tube is a rounded rectangle; The opposite sides of the two scrapers abut against each other, and a notch is provided in the middle of the opposite sides of the scrapers. The notches of the two scrapers are combined to form a make-shift portion that can accommodate the air guide tube, and the sides of the two scrapers that are away from each other are both flat.

3. A straw fermentation device for reducing crusting rate according to claim 1, characterized in that: The fermentation tank includes two first side plates arranged opposite to each other and two second side plates arranged opposite to each other, the bottoms of the first side plates and the second side plates are connected to the bottom wall of the cylinder, the top of the first side plate is higher than the top of the second side plate, and the two sides of the scraper in the length direction are respectively abutted against the two first side plates.

4. A straw fermentation device for reducing crusting rate according to claim 3, characterized in that: The upper surface of the second side plate gradually slopes downward in a direction away from the scraper.

5. A straw fermentation device for reducing crusting rate according to claim 2, characterized in that: The driving mechanism includes two driving components symmetrically arranged on both sides of the air guide tube, and the driving component includes a motor installed on the cover body. The output shaft of the motor is fixedly connected to a bidirectional screw rod, and the outer periphery of the two threaded sections of the bidirectional screw rod is respectively threaded with a nut, and the bottoms of the two nuts are respectively fixedly connected to the two scrapers through connecting rods.

6. A straw fermentation device for reducing crusting rate according to claim 5, characterized in that: The top of the scraper is provided with two grooves, the two grooves are symmetrically distributed on both sides of the notch, and the connecting rod is connected in the corresponding grooves.

7. The straw fermentation device for reducing crusting rate according to claim 1, characterized in that: The cylinder is provided with a socket at a position corresponding to the liquid collecting port, a plug plate is plugged into the socket, an opening is provided on the plug plate, and the filter screen is provided at the opening.

8. A straw fermentation device for reducing crusting rate according to claim 7, characterized in that: Support plates for supporting the inserting plate are arranged on both sides of the liquid collecting port.

9. A straw fermentation device for reducing crusting rate according to claim 7, characterized in that: A handle is connected to the outer side of the plug board.

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