Complete mixing and plug flow integrated composite anaerobic fermentation reactor

Abstract

The present application discloses a complete mixing and plug flow integrated composite anaerobic fermentation reactor, and relates to the field of reactors, the complete mixing and plug flow integrated composite anaerobic fermentation reactor comprises a reactor outer tank, and the peripheral outer walls of the reactor outer tank are respectively provided with a feed pipe and a return pipe structure. According to the invention, a plurality of return pipes are arranged on the periphery of the bottom of the reactor outer tank, and materials in the reactor outer tank flow back to the front of the feed pipe and then enter the reactor outer tank through the feed pipe, so that the number and activity of strains of the whole reactor are ensured; compared with a single plug flow type reactor, the method has the advantages that the anaerobic fermentation staying time is long, the problems of low volume gas production rate, short material flow and the like are avoided, and compared with the single plug flow type reactor, the technology adopts the fermentation liquor which is subjected to anaerobic fermentation by the CSTR to flow back, and meanwhile, the CSTR can be used for diluting toxic substances; and the number and activity of strains in the reactor are ensured.

Description

Technical Field

[0001] The present application relates to the field of reactors, and in particular to a composite anaerobic fermentation reactor integrating full mixing and plug flow. Background Art

[0002] Anaerobic fermentation is a biochemical reaction that takes place in an oxygen-free environment. Microorganisms produce energy and waste during the decomposition of organic matter. Anaerobic fermentation refers to a complex biochemical process in which organic matter (such as human, livestock and poultry feces, straw, weeds, etc.) is decomposed and metabolized by a wide variety of microorganisms with huge numbers and different functions under certain moisture, temperature and anaerobic conditions, ultimately forming a mixed gas such as methane and carbon dioxide.

[0003] At present, the anaerobic fermentation technology for treating organic solid waste can be divided into three types according to the feed concentration: dry anaerobic fermentation, semi-dry anaerobic fermentation and wet anaerobic fermentation. The feed concentration of dry anaerobic fermentation technology is relatively high, and the anaerobic reactor adopts a plug flow reactor with a high volumetric gas production rate, but there are problems such as the inability to guarantee the number and activity of bacteria in the reactor; the feed concentration of semi-dry anaerobic fermentation and wet anaerobic fermentation is relatively low, and the anaerobic reactor adopts a CSTR fully mixed reactor, which can dilute the toxic substances in the material, but the daily discharge will take away some new materials that have not been fully fermented, resulting in a certain loss of gas production, that is, there are problems such as low volumetric gas production rate and material short flow. Utility Model Content

[0004] In order to ensure the quantity and activity of bacteria in the reactor, dilute toxic substances in the material, avoid short flow of materials, and ensure a high volumetric gas production rate, the present application provides a composite anaerobic fermentation reactor integrating full mixing and plug flow.

[0005] The present application provides a composite anaerobic fermentation reactor integrating full mixing and plug flow, which adopts the following technical solution: a composite anaerobic fermentation reactor integrating full mixing and plug flow, comprising an outer reactor tank, wherein the outer walls of the outer reactor tank are respectively provided with a feed pipe and a return pipe, a mounting cover is detachably mounted on the outer reactor tank, a reactor inner tank is disposed within the outer reactor tank, and a stirring mechanism is disposed within the inner reactor tank;

[0006] The stirring mechanism includes a motor arranged on a mounting cover, the output end of the motor passes through the top outer wall of the mounting cover through a coupling and is fixedly mounted with a stirring column, a plurality of stirring rods are fixedly mounted on the stirring column, and a plurality of groups of stirring rods are fixedly mounted with a mounting frame, a plurality of bevel teeth are fixedly mounted on the mounting frame, two connecting rods are symmetrically fixedly mounted on the outer surface of the stirring column, and a scraper can be detachably mounted on one side of the two connecting rods, a conical bottom is provided on the bottom inner wall of the reactor outer tank, and a supporting foot is fixedly mounted on the bottom outer wall of the reactor outer tank.

[0007] By adopting the above technical solution, multiple reflux pipes are set around the bottom of the outer tank of the reactor to reflux the material in the outer tank of the reactor to the front of the feed pipe, and then enter the outer tank of the reactor through the feed pipe, which ensures the number and activity of the bacterial strains in the entire reactor. Compared with a single CSTR fully mixed anaerobic reactor, this technology first passes through the CSTR fully mixed anaerobic reactor and then enters the plug flow reactor. The anaerobic fermentation residence time is long, avoiding problems such as low volumetric gas production rate and material short flow. Compared with a single plug flow reactor, this technology uses the fermentation liquid after anaerobic fermentation in the CSTR fully mixed anaerobic reactor to reflux. At the same time, the CSTR fully mixed anaerobic reactor can dilute toxic substances, thereby ensuring the number and activity of bacterial strains in the reactor.

[0008] Preferably, a mounting bracket is fixedly mounted on the top outer wall of the mounting cover, and the motor is fixedly mounted on the mounting bracket.

[0009] By adopting the above technical solution, the motor can be fixedly installed by providing a mounting frame.

[0010] Preferably, a T-shaped slot is provided on the top outer wall of the connecting rod, a T-shaped block is slidably installed in the T-shaped slot, and the T-shaped block is fixedly connected to the scraper.

[0011] By adopting the above technical solution, the T-slot and T-block are provided to assist in installation.

[0012] Preferably, a positioning plate is provided on the connecting rod, a fixing bolt is screwed onto the positioning plate, and the positioning plate is located above the T-block.

[0013] By adopting the above technical solution, the fixed installation of the positioning plate can be released by rotating the fixing bolt, thereby facilitating the disassembly of the scraper.

[0014] Preferably, a viewing mirror is provided above one side of the outer tank of the reactor for viewing.

[0015] By adopting the above technical solution, a viewing mirror is provided to facilitate observation.

[0016] Preferably, a manhole for the reactor outer tank is provided below one side of the reactor outer tank, a manhole for the reactor inner tank is provided below one side of the reactor inner tank, a discharge pipe is provided on one side of the reactor outer tank, and one end of the discharge pipe is located inside the reactor inner tank.

[0017] By adopting the above technical solution, discharging can be carried out by setting a discharging pipe.

[0018] Preferably, mounting ears are fixedly mounted on the outer surfaces of both sides of the reactor outer tank and the mounting cover, and both mounting ears are provided with latches.

[0019] By adopting the above technical solution, the fixed installation of the two mounting ears can be released by moving the pin, and then the mounting cover can be disassembled. At this time, the mounting cover can be pulled and the entire stirring mechanism can be disassembled.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. This application adopts the cooperation of reflux pipes, etc., and multiple reflux pipes are set around the bottom of the outer tank of the reactor to reflux the material in the outer tank of the reactor to the front of the feed pipe, and then enter the outer tank of the reactor through the feed pipe. This ensures the number and activity of bacteria in the entire reactor. Compared with a single CSTR fully mixed anaerobic reactor, this technology first passes through the CSTR fully mixed anaerobic reactor and then enters the plug flow reactor. The anaerobic fermentation residence time is long, avoiding problems such as low volumetric gas production rate and material short flow. Compared with a single plug flow reactor, this technology uses the fermentation liquid after anaerobic fermentation in the CSTR fully mixed anaerobic reactor to reflux. At the same time, the CSTR fully mixed anaerobic reactor can dilute toxic substances, thereby ensuring the number and activity of bacteria in the reactor.

[0022] 2. This application adopts the cooperation of the manhole of the inner tank of the reactor, etc., and sets a sight glass above the liquid level on the outside of the tank wall of the outer tank of the reactor of the composite anaerobic fermentation reactor to facilitate observation of the height of the liquid level in the reactor. A manhole for the outer tank of the reactor is set at the outer bottom of the tank wall of the outer tank of the reactor, and a manhole for the inner tank of the reactor is also set at the outer bottom of the tank wall of the inner tank of the reactor. The manholes are set in the inner and outer tanks to facilitate installation inside the tank and later tank maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of a composite anaerobic fermentation reactor integrating full mixing and plug flow according to an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram showing the internal structure of the reactor outer tank according to an embodiment of the present application;

[0025] Figure 3This is a schematic diagram mainly showing the overall cross-sectional structure of an embodiment of the present application;

[0026] Figure 4 This is a partial expansion diagram of the stirring structure of the embodiment of the present application;

[0027] Figure 5 This is a partial expanded schematic diagram of the reactor outer tank structure mainly embodies the embodiment of the present application.

[0028] Figure markings: 1. Feed pipe; 2. Reactor outer tank; 3. Reactor inner tank; 4. Reflux pipe; 5. Discharge pipe; 6. Mounting cover; 7. Sight glass; 8. Manhole of reactor outer tank; 9. Manhole of reactor inner tank; 10. Conical bottom; 11. Support foot; 12. Mounting ear; 13. Latch; 14. Mounting frame; 15. Motor; 16. Stirring column; 17. Stirring rod; 18. Mounting frame; 19. Conical gear; 20. Connecting rod; 21. Scraper; 22. T-slot; 23. T-block; 24. Positioning plate; 25. Fixing bolt. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-Figure 5 This application is described in further detail.

[0030] The embodiments of the present application disclose a composite anaerobic fermentation reactor integrating full mixing and plug flow.

[0031] Reference Figure 1-3 A composite anaerobic fermentation reactor integrating full mixing and plug flow, comprising an outer reactor tank 2, a plurality of feed pipes 1 and return pipes 4 arranged on the outer walls of the outer reactor tank 2, a mounting cover 6 detachably mounted on the outer reactor tank 2, an inner reactor tank 3 arranged in the outer reactor tank 2, a stirring mechanism arranged in the inner reactor tank 3, and a positioning mechanism arranged on the stirring mechanism;

[0032] 2. The stirring mechanism includes a mounting frame 14 fixedly mounted on the mounting cover 6, a motor 15 fixedly mounted on the mounting frame 14, and the output end of the motor 15 passes through the top outer wall of the mounting cover 6 through a coupling and is fixedly mounted with a stirring column 16, a plurality of stirring rods 17 fixedly mounted on the stirring column 16, and a plurality of groups of stirring rods 17 are fixedly mounted with a mounting frame 18, a plurality of bevel teeth 19 fixedly mounted on the mounting frame 18, two connecting rods 20 fixedly mounted on the outer surface of the stirring column 16, and a scraper 21 is detachably mounted on one side of the two connecting rods 20, and a stirring rod 17 is fixedly mounted on the outer surface of the stirring column 16. A conical bottom 10 is provided on the inner wall of the bottom of the reactor outer tank 2, a supporting foot 11 is fixedly installed on the outer wall of the bottom of the reactor outer tank 2, a T-slot 22 is provided on the outer wall of the top of the connecting rod 20, a T-block 23 is slidably installed in the T-slot 22, and the T-block 23 is fixedly connected to the scraper 21, a sight glass 7 for viewing is provided above one side of the reactor outer tank 2, a reactor outer tank manhole 8 is provided below one side of the reactor outer tank 2, a reactor inner tank manhole 9 is provided below one side of the reactor inner tank 3, and a discharge pipe 5 is provided on one side of the reactor outer tank 2, and one end of the discharge pipe 5 is located in the reactor inner tank 3.

[0033] During use, organic solid waste enters the reactor outer tank 2 through the feed pipe 1, is transported to the liquid level height of the reactor through the pipeline and gushes out, and the material slowly fills the reactor outer tank 2 to the liquid level height. A plurality of feed pipes 1 are arranged around the reactor outer tank 2 to ensure that the materials in the reactor outer tank 2 are evenly mixed. Therefore, the reactor outer tank 2 is a CSTR fully mixed reactor. At the same time, a plurality of reflux pipes 4 are arranged around the bottom of the reactor outer tank 2 to reflux the materials in the reactor outer tank 2 to the front of the feed pipe 1, and then enter the reactor outer tank 2 through the feed pipe 1, thereby ensuring the number and activity of the bacterial strains in the entire reactor.

[0034] By controlling the start motor 15, the output end of the motor 15 will drive the stirring column 16 to rotate, and the stirring column 16 will rotate and drive multiple stirring rods 17 to rotate as well. The rotation of multiple stirring rods 17 will also drive the mounting frame 18 and the bevel gear 19 to rotate. The rotation of the bevel gear 19 will crush larger materials. While the stirring column 16 rotates, it will also drive the connecting rod 20 and the scraper 21 to rotate. The scraper 21 rotates and cleans the inner wall of the reactor inner tank 3. The materials are mixed evenly under the action of stirring; the materials in the reactor inner tank 3 are continuously fed and discharged from top to bottom. The materials in the tank gradually move forward while fermenting and producing gas until they move to the bottom discharge pipe 5. Therefore, the reactor inner tank 3 is a plug flow reactor. Multiple discharge pipes 5 are set at the bottom of the tank, and a conical bottom 10 is set at the same time, so that the sand at the bottom of the tank is gathered at the center of the bottom of the tank and discharged out of the tank together with the materials through the discharge pipe 5.

[0035] Reference Figure 3-5The positioning mechanism includes a positioning plate 24 arranged on the connecting rod 20, a fixing bolt 25 screwed on the positioning plate 24, and the positioning plate 24 is located above the T-block 23, two mounting ears 12 fixedly mounted on the outer surfaces of the reactor outer tank 2 and the mounting cover 6 on both sides, and a pin 13 arranged on the two mounting ears 12.

[0036] During use, the two mounting ears 12 can be released from their fixed installation by moving the latch 13, and the mounting cover 6 can be disassembled. At this time, the mounting cover 6 can be pulled and the entire stirring mechanism can be removed. The positioning plate 24 can be released from its fixed installation by rotating the fixing bolt 25, making it easier to disassemble the scraper 21.

[0037] The implementation principle of the composite anaerobic fermentation reactor integrating full mixing and plug flow in the embodiment of the present application is as follows: when in use, organic solid waste enters the reactor outer tank 2 through the feed pipe 1, is transported through the pipeline to the liquid level height of the reactor and gushes out, and the material slowly fills the reactor outer tank 2 to the liquid level height. A plurality of feed pipes 1 are arranged around the reactor outer tank 2 to ensure that the materials in the reactor outer tank 2 are evenly mixed. Therefore, the reactor outer tank 2 is a CSTR fully mixed reactor. At the same time, a plurality of reflux pipes 4 are arranged around the bottom of the reactor outer tank 2 to reflux the materials in the reactor outer tank 2 to the front of the feed pipe 1, and then enter the reactor outer tank 2 through the feed pipe 1, thereby ensuring the number and activity of bacteria in the entire reactor;

[0038] When the outer tank 2 of the reactor is filled to the liquid level, the material will overflow into the inner tank 3 of the reactor during feeding. By controlling the starting motor 15, the output end of the motor 15 will drive the stirring column 16 to rotate. The stirring column 16 rotates and drives multiple stirring rods 17 to rotate. The rotation of multiple stirring rods 17 will also drive the mounting frame 18 and the bevel gear 19 to rotate. The rotation of the bevel gear 19 will crush the larger materials. While the stirring column 16 rotates, it will also drive the connecting rod 20 and the scraper 21 to rotate. The scraper 21 rotates and cleans the inner wall of the reactor inner tank 3. The materials are mixed evenly under the action of stirring. The materials in the reactor inner tank 3 are continuously fed and discharged from top to bottom. The materials in the tank gradually move forward while fermenting and producing gas until they move to the bottom discharge pipe 5. Therefore, the reactor inner tank 3 is a plug flow reactor. Multiple discharge pipes 5 are set at the bottom of the tank, and a conical bottom 10 is set at the same time, so that the sand at the bottom of the tank is gathered at the center of the bottom of the tank and discharged out of the tank together with the materials through the discharge pipe 5.

[0039] A sight glass 7 is provided on the outer wall of the outer tank 2 of the composite anaerobic fermentation reactor above the liquid level to facilitate observation of the height of the liquid level in the reactor. A manhole 8 is provided on the outer bottom of the outer tank 2 of the reactor, and a manhole 9 is also provided on the outer bottom of the inner tank 3 of the reactor. The manholes of the inner and outer tanks are provided to facilitate installation in the tank and later maintenance of the tank body. Compared with a single CSTR fully mixed anaerobic reactor, this technology first passes through a CSTR fully mixed anaerobic reactor and then enters a plug flow reactor. The anaerobic fermentation residence time is long, which avoids problems such as low volumetric gas production rate and material short flow. Compared with a single plug flow reactor, the present invention first passes through a CSTR fully mixed anaerobic reactor and then enters a plug flow reactor. The anaerobic fermentation residence time is long, which avoids problems such as low volumetric gas production rate and material short flow. Compared with the CSTR fully mixed anaerobic reactor, this technology uses the fermentation liquid that has been anaerobic fermented in the CSTR fully mixed anaerobic reactor to return. At the same time, the CSTR fully mixed anaerobic reactor can dilute toxic substances, ensuring the number and activity of bacteria in the reactor. For certain specific materials, it is necessary to set up both "fully mixed" and "plug flow" anaerobic reactors at the same time, which has the problems of complex design process and plant area, and large overall footprint. This technology only needs to set up one anaerobic reactor but has the functions of both "fully mixed" and "plug flow" anaerobic reactors, which has the advantages of simple design process and plant environment, and small overall footprint.

[0040] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A composite anaerobic fermentation reactor integrating full mixing and plug flow, comprising a reactor outer tank (2), characterized in that: The outer walls of the reactor outer tank (2) are respectively provided with a feed pipe (1) and a reflux pipe (4); a mounting cover (6) is detachably mounted on the reactor outer tank (2); a reactor inner tank (3) is disposed within the reactor outer tank (2); and a stirring mechanism is disposed within the reactor inner tank (3); The stirring mechanism comprises a motor (15) arranged on a mounting cover (6), an output end of the motor (15) passes through the top outer wall of the mounting cover (6) through a coupling and is fixedly mounted with a stirring column (16), a plurality of stirring rods (17) are fixedly mounted on the stirring column (16), a plurality of groups of stirring rods (17) are fixedly mounted with a mounting frame (18), a plurality of bevel teeth (19) are fixedly mounted on the mounting frame (18), two connecting rods (20) are symmetrically fixedly mounted on the outer surface of the stirring column (16), a scraper (21) is detachably mounted on one side of the two connecting rods (20), a conical bottom (10) is provided on the bottom inner wall of the reactor outer tank (2), and a supporting foot (11) is fixedly mounted on the bottom outer wall of the reactor outer tank (2).

2. The composite anaerobic fermentation reactor integrating full mixing and plug flow according to claim 1, characterized in that: A mounting frame (14) is fixedly mounted on the top outer wall of the mounting cover (6), and the motor (15) is fixedly mounted on the mounting frame (14).

3. The composite anaerobic fermentation reactor integrating full mixing and plug flow according to claim 1, characterized in that: A T-shaped slot (22) is provided on the top outer wall of the connecting rod (20), a T-shaped block (23) is slidably installed in the T-shaped slot (22), and the T-shaped block (23) is fixedly connected to the scraper (21).

4. The composite anaerobic fermentation reactor integrating full mixing and plug flow according to claim 3, characterized in that: A positioning plate (24) is provided on the connecting rod (20), a fixing bolt (25) is screwed onto the positioning plate (24), and the positioning plate (24) is located above the T-shaped block (23).

5. The composite anaerobic fermentation reactor integrating full mixing and plug flow according to claim 1, characterized in that: A viewing mirror (7) for viewing is provided above one side of the reactor outer tank (2).

6. The composite anaerobic fermentation reactor integrating full mixing and plug flow according to claim 1, characterized in that: A reactor outer tank manhole (8) is provided below one side of the reactor outer tank (2), a reactor inner tank manhole (9) is provided below one side of the reactor inner tank (3), a discharge pipe (5) is provided on one side of the reactor outer tank (2), and one end of the discharge pipe (5) is located inside the reactor inner tank (3).

7. The composite anaerobic fermentation reactor integrating full mixing and plug flow according to claim 1, characterized in that: Mounting ears (12) are fixedly mounted on the outer surfaces of both sides of the reactor outer tank (2) and the mounting cover (6), and latches (13) are provided on the two mounting ears (12).

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