A device for extracting and recovering VFA in kitchen waste acidification fermentation liquid

Abstract

The application relates to a device for extracting and recovering VFAs in kitchen waste acidification fermentation liquid, and relates to the technical field of VFAs extraction and recovery equipment, which comprises a recovery tank, a first ultrafiltration membrane, a mounting frame, a sealing assembly, a blocking plate, a first air bellow, a first air baffle, a condensing assembly and a heating tank; the recovery tank is provided with an inlet and a water outlet, and a valve is arranged in the inlet; the first ultrafiltration membrane is arranged in the mounting frame; the mounting frame is connected in the recovery tank and divides the recovery tank into two parts; the sealing assembly is arranged around the mounting frame and seals between the mounting frame and the inner side wall of the recovery tank; the blocking plate is arranged above the first ultrafiltration membrane and is connected with the inner top of the recovery tank through a first telescopic unit, and the first telescopic unit is used for driving the blocking plate to move up and down; the first air bellow is arranged at the top end of the recovery tank; the first air baffle is connected below the blocking plate and is communicated with the first air bellow through a pipeline; the device can collect the VFAs remaining on the surface of the first ultrafiltration membrane, so that the recovery efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of VFAs extraction and recovery equipment technology, specifically to a device for extracting and recovering VFAs from acidification and fermentation liquid of kitchen waste. Background Technology

[0002] Food waste treatment can effectively improve the resource utilization level of food waste. On the basis of obtaining crude oil from traditional food waste treatment, it can further obtain a large amount of VFAs composite carbon source, thereby utilizing food waste, promoting low-carbon and sustainable development, and creating economic benefits.

[0003] In existing technologies, when using membrane methods to extract VFAs from food waste, the VFAs filtered through ultrafiltration membranes are often directly discharged. However, some VFAs still adhere to the surface of the ultrafiltration membrane, which reduces the final extraction efficiency of VFAs. Summary of the Invention

[0004] This invention provides a device for extracting and recovering VFAs from acidification and fermentation liquid of kitchen waste.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an extraction and recovery device for VFAs in acidification fermentation liquid of kitchen waste, including a recovery box, a first ultrafiltration membrane, an installation frame, a sealing component, a baffle plate, a first air box, a first air plate, a condensation component and an electric heating box;

[0006] The recycling bin has an inlet and an outlet, and a valve is installed inside the inlet;

[0007] The first ultrafiltration membrane is disposed within the mounting frame;

[0008] The mounting frame is connected inside the recycling bin and divides the inside of the recycling bin into upper and lower parts;

[0009] The sealing assembly is disposed around the mounting frame and is used to seal the mounting frame and the inner wall of the recycling bin.

[0010] The barrier plate is located above the first ultrafiltration membrane and is connected to the inner top of the recycling box through a first telescopic unit. The first telescopic unit is used to drive the barrier plate to move up and down.

[0011] The first air box is installed on top of the recycling box;

[0012] The first air plate is connected to the bottom of the baffle plate and is connected to the first air box through a pipe. A valve is installed on the pipe. The first air plate is provided with an absorption channel for adsorbing and recovering the gas volatilized in the box and connected to the condensation component.

[0013] The electric heating box is connected to the recycling box.

[0014] The condensation assembly includes a water bath condensation box, a condenser tube, and a storage box. The water bath condensation box is installed on the top of the recovery box, and the storage box is installed on the side wall of the recovery box and is lower than the water bath condensation box. The two ends of the condenser tube are connected to the water bath condensation box and the storage box, respectively. The first air box is connected to the condenser tube through a pipe, and the pipe passes through the water bath condensation box.

[0015] The first air plate is provided with a slag suction channel for adsorbing waste residue, and the first air box is provided with a first storage box. The slag suction channel is connected to the first storage box through a pipe.

[0016] The bottom surface of the baffle plate is provided with a first sliding groove, and a first electric slider is slidably installed in the first sliding groove. The bottom end of the first electric slider is connected to the first air plate through a second telescopic unit.

[0017] The baffle plate is arc-shaped, and the first groove extends along the arc surface of the baffle plate.

[0018] There are two first air plates, and the first air box corresponds to the first air plate. The adsorption channel and the sludge suction channel are located in one of the first air plates, and the other first air plate can blow air into the recovery box through the first air box corresponding to it.

[0019] The recycling bin is equipped with a rotating unit for driving the mounting frame to rotate. The axis around which the mounting frame rotates is parallel to one side of the frame and can rotate to a vertical position.

[0020] The recycling bin has two inner sidewalls that are opposite to each other, each with a second sliding groove extending along the height of the recycling bin. A second electric slider is slidably installed in each of the two second sliding grooves, and the rotating unit is mounted on the second electric slider.

[0021] The sealing assembly includes two first sealing plates and two second sealing plates. The two first sealing plates and the two second sealing plates are disposed opposite to each other on the outside of the mounting frame, and each first sealing plate and each second sealing plate corresponds to one side of the mounting frame. The second sealing plate is provided with a recess for the second electric slider to extend out.

[0022] The mounting frame has a first mounting groove that slides with the first sealing plate at each of the two corresponding positions of the first sealing plate. A third telescopic unit for driving the first sealing plate to move is installed in the first mounting groove. The mounting frame has a second mounting groove that slides with the second sealing plate at each of the two corresponding positions of the second sealing plate. A fourth telescopic unit for driving the second sealing plate to move is installed in the second mounting groove.

[0023] The first sealing plate and the second sealing plate form an outer contour surface that is adapted to the inner contour surface of the recycling bin and abuts against each other.

[0024] The second sealing plate is provided with a third sealing block, which is located above the second electric slider and inserted into the second groove.

[0025] The mounting frame is provided with partitions that correspond one-to-one with each of its sides, and the partitions are connected end to end.

[0026] The bottom of the recycling bin is provided with a support plate and a second air plate. Both the support plate and the second air plate are inclined and connected at the downward inclined ends. A second air box is installed at the bottom of the recycling bin. The second air box is connected to the second air plate through a pipe and is used to make the second air plate draw in air.

[0027] The bottom of the second air box is connected to a second storage box for collecting waste residue.

[0028] There are two second air boxes. Both second air boxes are connected to the second air plate through pipes, and valves are installed in both pipes. One second air box is used to draw air into the second air plate, and the other second air box is used to blow air out of the second air plate.

[0029] The outer wall of the recycling bin is rotatably connected to a door.

[0030] By employing the above technical solutions, the present invention has the following beneficial effects compared to the prior art:

[0031] 1. By setting up a first ultrafiltration membrane and a first air plate, the inside of the recovery box is heated, which causes the VFAs on the surface of the first ultrafiltration membrane to volatilize. The first air plate can adsorb the volatilized VFAs inside the recovery box. The adsorbed VFAs enter the water bath condenser through a conduit. The water bath condenser condenses the volatilized VFAs, turning the gaseous VFAs into liquid, thereby collecting the VFAs remaining on the surface of the first ultrafiltration membrane and improving the recovery efficiency.

[0032] 2. While the first air plate cleans the top of the first ultrafiltration membrane, it also adsorbs and discharges impurities. By rotating the mounting frame and the first ultrafiltration membrane through the rotating unit, the other side of the first ultrafiltration membrane is cleaned. At the same time, the mounting frame and the first ultrafiltration membrane are rotated to be perpendicular to the bottom of the recovery box, which can further improve the collection efficiency of volatile gases. The portion of VFAs that are not filtered by the first ultrafiltration membrane at the bottom of the recovery box can also be volatilized and collected.

[0033] 3. By setting up a sealing component and a partition, the sealing component ensures the sealing of the first ultrafiltration membrane and provides rotation conditions for the first ultrafiltration membrane to rotate; the partition can block VFAs in the fermentation broth during the filtration process of the first ultrafiltration membrane, preventing the fermentation broth from overflowing into the gap between the first sealing plate and the second sealing plate and the partition during the pouring process. Attached Figure Description

[0034] The invention will be further described below with reference to the accompanying drawings.

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 This is a schematic diagram illustrating the internal structure of the recycling bin according to the present invention;

[0037] Figure 3 This is a schematic diagram illustrating the structure of the water outlet of the present invention;

[0038] Figure 4 This is a schematic diagram illustrating the structure of the feed inlet of the present invention;

[0039] Figure 5 This is a schematic diagram illustrating the structure of the resist plate in this invention;

[0040] Figure 6 This is an exploded view illustrating the first air panel of the present invention;

[0041] Figure 7 This is a schematic diagram illustrating the structure of the mounting frame and the rotating rod in this invention;

[0042] Figure 8 This is a schematic diagram illustrating the structure of the first sealing plate and the second sealing plate of the present invention;

[0043] Figure 9 This is a schematic diagram illustrating the structure of the third sealing block in this invention.

[0044] In the diagram: 1. Recycling box; 2. First air box; 3. Water bath condenser box; 4. Box door; 5. Support leg; 6. Baffle plate; 7. Mounting plate; 8. Second slide rail; 9. First ultrafiltration membrane; 10. Second air deflector; 11. Support plate; 12. Electric heating box; 14. Condenser pipe; 15. Storage box; 16. Water outlet; 17. Second air box; 18. Second electric slider; 19. Partition plate; 20. First sealing plate; 21. Second sealing plate; 22. First mounting groove; 23. Second mounting groove; 24. Third sealing block; 25. First slide rail; 26. First electric slider; 27. Second telescopic unit; 28. First air deflector; 29. ​​First telescopic unit; 30. Rotating rod. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings. In the description of this application, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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 orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of the present invention.

[0046] like Figures 1 to 9 As shown, the present invention provides an extraction and recovery device for VFAs in acidification fermentation liquid of kitchen waste, comprising a recovery box 1, a first ultrafiltration membrane 9, an installation frame, a sealing assembly, a baffle plate 6, a first air box 2, a first air plate 28, a condensation assembly, and an electric heating box 12.

[0047] like Figure 3 and Figure 4 As shown, the recycling tank 1 has an inlet and an outlet 16. A valve is installed inside the inlet, and the outlet 16 is located at the bottom of the recycling tank 1, with a second ultrafiltration membrane installed inside the outlet 16. An electric heating box 12 is connected to the top of an outer wall of the recycling tank 1. A door 4 for closing the opening is rotatably connected to the outer wall of the recycling tank 1, and support legs 5 are provided at the bottom of the recycling tank 1 for support.

[0048] like Figure 5 and Figure 6 As shown, the baffle plate 6 is arc-shaped and located inside the recycling bin 1. The baffle plate 6 is connected to the inner top of the recycling bin 1 via a first telescopic unit 29, which drives the baffle plate 6 to move up and down. The bottom surface of the baffle plate 6 has a first groove 25 extending along its arc direction. Two first electric sliders 26 are slidably installed in the first groove 25. The bottom ends of the two first electric sliders 26 are provided with second telescopic units 27. There are two first air plates 28, and the two first air plates 28 are respectively connected to the two second telescopic units 27. The second telescopic units 27 drive the first air plates 28 to move up and down.

[0049] like Figure 2As shown, there are two first air boxes 2, both installed on top of the recovery box 1. Each first air box 2 corresponds to one of the two first air plates 28. Both first air boxes 2 are connected to their respective first air plates 28 via pipes, and valves are installed on both pipes. One of the first air plates 28 has an independent absorption channel and a sludge suction channel. The absorption channel is used to adsorb the gases volatilized in the recovery box 1 and transport them to the condensation assembly. The sludge suction channel is used to adsorb the waste residue on the surface of the first ultrafiltration membrane 9. A first storage box is provided on the first air box 2 corresponding to the sludge suction channel. The sludge suction channel is connected to the first storage box via a pipe, and the first storage box is used to collect the waste residue adsorbed by the sludge suction channel. The other first air plate 28 can blow air into the recovery box 1 through its corresponding first air box 2.

[0050] The condensation assembly includes a water bath condenser 3, a condenser pipe 14, and a storage tank 15. The water bath condenser 3 is installed on the top of the recovery tank 1, and the storage tank 15 is installed on the side wall of the recovery tank 1 and is lower than the water bath condenser 3. One end of the top of the storage tank 15 is connected to an exhaust port. The two ends of the condenser pipe 14 are connected to the water bath condenser 3 and the storage tank 15 respectively. The first air box 2 is connected to the condenser pipe 14 through a pipe, and the pipe passes through the water bath condenser 3.

[0051] like Figure 2 and Figure 8 As shown, the mounting frame is rectangular and connected inside the recovery box 1. The mounting frame is located below the baffle plate 6, and the first ultrafiltration membrane 9 is placed inside the mounting frame, dividing the interior of the recovery box 1 into upper and lower parts. The mounting frame is equipped with partitions 19 corresponding to each of its sides. These partitions 19 are connected end-to-end, forming a rectangular area corresponding to the first ultrafiltration membrane 9. The partitions 19 can block and collect the VFAs filtered from the fermentation broth during the filtration process of the first ultrafiltration membrane 9.

[0052] like Figure 8 and Figure 9 As shown, the sealing assembly is disposed around the periphery of the mounting frame to seal the space between the mounting frame and the inner wall of the recycling bin 1. The sealing assembly includes two first sealing plates 20 and two second sealing plates 21, which are disposed opposite to each other on the outer side of the mounting frame, and each first sealing plate 20 and each second sealing plate 21 corresponds to one side of the mounting frame.

[0053] The mounting frame has first mounting grooves 22 at the positions corresponding to the two first sealing plates 20, which slide and engage with the first sealing plates 20. A third telescopic unit for driving the movement of the first sealing plates 20 is installed in each first mounting groove 22. The mounting frame also has second mounting grooves 23 at the positions corresponding to the two second sealing plates 21, which slide and engage with the second sealing plates 21. A fourth telescopic unit for driving the movement of the second sealing plates 21 is installed in each second mounting groove 23. Under the control of the third and fourth telescopic units respectively, the outer contour surfaces of the first sealing plates 20 and 21 are adapted to and abut against the inner contour surface of the recovery box 1, ensuring the sealing performance of the first ultrafiltration membrane 9.

[0054] The first telescopic unit 29, the second telescopic unit 27, the third telescopic unit, and the fourth telescopic unit are all electric telescopic rods. In addition, displacement drive components such as electric cylinders and servo cylinders can also be used.

[0055] like Figure 2 , Figure 7 and Figure 8 As shown, each of the two opposing inner sidewalls of the recycling bin 1 has a second sliding groove 8 extending along the height direction of the recycling bin 1. A second electric slider 18 is slidably installed in each of the two second sliding grooves 8. Both second electric sliders 18 are connected to the mounting frame via a rotating unit. The rotating unit can drive the mounting frame to rotate, with the axis of rotation parallel to one side of the mounting frame and capable of rotating to a vertical position. The second electric sliders 18 drive the mounting frame to move up and down. During the upward sliding of the mounting frame, the first sealing plate 20 and the second sealing plate 21 can scrape and clean the inner wall of the recycling bin 1.

[0056] The second sealing plate 21 has a recess for the second electric slider 18 to extend out, and the second sealing plate 21 has a third sealing block 24 at the corresponding recess position. The third sealing block 24 is located above the second electric slider 18 and is inserted into the second groove 8 for sealing.

[0057] The rotating unit includes two rotating rods 30 and two rotating motors. The rotating rods 30 are fixed to opposite sides of the two second electric sliders 18. Each rotating motor corresponds to one of the rotating rods 30 and is installed inside the rotating rod 30. The motor shaft of the rotating motor is connected to the side wall of the mounting frame. The rotating motor drives the rotating shaft to rotate, which in turn causes the mounting frame to rotate.

[0058] like Figure 2 and Figure 3As shown, the bottom of the recycling bin 1 is provided with a support plate 11 and a second air deflector 10. Both the support plate 11 and the second air deflector 10 are inclined and connected at their downward-inclined ends. Two second air boxes 17 are installed at the bottom of the recycling bin 1. Both second air boxes 17 are connected to the second air deflector 10 through pipes, and valves are installed in both pipes. One second air box 17 is used to draw air from the second air deflector 10, and the other second air box 17 is used to blow air from the second air deflector 10. A second collection box for collecting waste residue is installed at the bottom of the second air box 17 used to draw air from the second air deflector 10.

[0059] The principle of this embodiment is as follows: In use, the frame and the first ultrafiltration membrane 9 are mounted by two second electric sliders 18 sliding upward inside the second slide groove 8, so that the first ultrafiltration membrane 9 is located below the feed inlet. The valve inside the feed inlet is opened, and the fermentation liquid is filtered through the first ultrafiltration membrane 9 and poured into the recovery tank 1. The first ultrafiltration membrane 9 filters out the VFAs in the fermentation liquid. At the same time, the valve inside the outlet 16 is opened, and the filtered waste liquid is discharged and collected through the outlet 16 until the fermentation liquid is completely filtered.

[0060] After the first ultrafiltration membrane 9 completely filters the VFAs in the fermentation broth, the filtered VFAs remain on the top surface of the first ultrafiltration membrane 9. At this time, all valves are closed to ensure the overall sealing of the recovery box 1. The electric heating box 12 is then powered on to heat the inside of the recovery box 1. After heating to a temperature that allows the VFAs on the surface of the first ultrafiltration membrane 9 to evaporate, the liquid VFAs will evaporate into gas. At this time, the electric telescopic rod corresponding to the first telescopic unit 29 is extended downward, and the baffle plate 6, together with the two first air plates 28 at its bottom, is extended downward to the top of the first ultrafiltration membrane 9. The first air box 2 with the air intake function is activated, and the valve of the absorption pipe inside the corresponding first air plate 28 is opened. The first air plate 28 adsorbs the volatilized VFAs inside the recovery box 1. The adsorbed VFAs enter the water bath condenser 3 through the conduit. The water bath condenser 3 condenses the volatilized VFAs, condensing the gaseous VFAs into liquid, and discharges them into the storage box 15 for collection through the condenser pipe 14.

[0061] If the air content inside the recovery box 1 is low due to adsorption by the first air plate 28 during the adsorption of VFAs, filtered clean air can be blown into the recovery box 1 through a combination of another first air plate 28 and a first air box 2 with a blowing function to ensure the adsorption efficiency of VFAs and to thoroughly collect the volatilized VFAs. In addition, the exhaust port connected to the top of the storage box 15 can discharge excess gas inside the storage box 15.

[0062] After all VFAs adhering to the surface of the first ultrafiltration membrane 9 have been collected, there is still filtered waste residue on the surface of the first ultrafiltration membrane 9. The first air plate 28 with suction function can be moved downward by the electric telescopic rod corresponding to the second telescopic unit 27 until the bottom of the first air plate 28 can contact the top of the first ultrafiltration membrane 9. Then, the first air plate 28 is moved by the corresponding first electric slider 26 inside the first slide groove 25. At the same time, the first air box 2 with suction function is activated. The first air plate 28 can scrape and clean the top of the first ultrafiltration membrane 9, and at the same time, it can adsorb the waste residue through the sludge suction channel inside the first air plate 28. The waste residue is then discharged into the first storage box for storage after being adsorbed by the first air plate 28.

[0063] After one side of the first ultrafiltration membrane 9 is cleaned, the other side of the first ultrafiltration membrane 9 is cleaned by rotating the mounting frame by rotating the motor. During the rotation, the first sealing plate 20 and the second sealing plate 21 are stored to provide the conditions for the rotation of the first ultrafiltration membrane 9.

[0064] After the waste residue is collected and cleaned, at the contact point between the waste residue and the top of the first ultrafiltration membrane 9, some VFAs have not completely volatilized due to the obstruction of the waste residue, and some VFAs are still attached to the surface of the first ultrafiltration membrane 9. By rotating the motor, the first ultrafiltration membrane 9 is rotated to a position perpendicular to the bottom of the recovery box 1, which further improves the collection efficiency of volatile gases and makes the first ultrafiltration membrane 9 heat up evenly. When the first ultrafiltration membrane 9 is rotated to a position perpendicular to the bottom of the recovery box 1, the VFAs that have not been filtered by the first ultrafiltration membrane 9 at the bottom of the recovery box 1 can also be volatilized and collected.

[0065] The inclined design of the support plate 11 allows waste residue that has not been filtered by the first ultrafiltration membrane 9 to roll off the inclined surface of the second air plate 10 due to gravity. After the adsorption and cleaning of impurities on the surface of the first ultrafiltration membrane 9 is completed, the second air box 17 with adsorption function is activated, and the bottom of the recovery box 1 is adsorbed and cleaned through the cleaning pipe inside the second air plate 10. At the same time, the waste residue that falls to the bottom of the recovery box 1 due to the rotation of the first ultrafiltration membrane 9 during the volatilization process will also be adsorbed and cleaned by the second air plate 10.

[0066] When the inside of the recovery box 1 is purged with air to ensure the adsorption efficiency of the first air plate 28, the second air box 17 with the air purging function is activated. Filtered air can be blown into the inside of the recovery box 1 through another pipe of the second air plate 10, which can improve the air injection efficiency.

[0067] When the device needs to be cleaned or repaired after a period of use, the fermentation liquid has an odor that can affect the cleaning and maintenance work. To address this, the first air box 2 and the second air box 17 with blowing function are activated, blowing air into the recycling box 1 through the corresponding first air plate 28 and the second air plate 10. The first air box 2 and the second air box 17 with suction function are also activated, sucking out the gas inside the recycling box 1 through the corresponding first air plate 28 and the second air plate 10. The absorbed gas can be discharged from the exhaust holes of the first and second storage boxes, respectively, which can circulate the air inside the recycling box 1 and reduce the impact of the odor inside the recycling box 1.

[0068] The second ultrafiltration membrane installed inside the outlet 16 can filter the discharged waste liquid and is connected to the storage tank 15 through a conduit. This can prevent the unfiltered VFAs from the first ultrafiltration membrane 9 from being discharged directly with the waste liquid, thus affecting the filtration efficiency.

[0069] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0070] The meaning of "and / or" as used in this application includes situations where each exists alone or both exist simultaneously.

[0071] The term "connection" as used in this application can mean a direct connection between components or an indirect connection between components through other components.

[0072] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A device for extracting and recovering VFAs from acidification and fermentation liquid of kitchen waste, characterized in that, It includes a recovery box (1), a first ultrafiltration membrane (9), a mounting frame, a sealing assembly, a baffle plate (6), a first air box (2), a first air plate (28), a condensation assembly, and an electric heating box (12); The recycling bin (1) has an inlet and an outlet (16), and a valve is installed in the inlet; The first ultrafiltration membrane (9) is disposed within the mounting frame; The mounting frame is connected inside the recycling bin (1) and divides the inside of the recycling bin (1) into upper and lower parts; The sealing assembly is disposed around the mounting frame and is used to seal the mounting frame with the inner wall of the recycling bin (1); The baffle plate (6) is located above the first ultrafiltration membrane (9) and is connected to the inner top of the recycling box (1) through the first telescopic unit (29). The first telescopic unit (29) is used to drive the baffle plate (6) to move up and down. The first bellows (2) is installed on top of the recycling box (1); The first air plate (28) is connected to the bottom of the baffle plate (6) and communicates with the first air box (2) through a pipe. A valve is installed on the pipe. The first air plate (28) is provided with an absorption channel for adsorbing the gas volatilized in the recovery box (1) and communicating with the condensation component. The electric heating box (12) is connected to the recycling box (1).

2. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 1, characterized in that, The condensation assembly includes a water bath condenser (3), a condenser pipe (14), and a storage tank (15). The water bath condenser (3) is installed on the top of the recovery tank (1). The storage tank (15) is installed on the side wall of the recovery tank (1) and is lower than the water bath condenser (3). The two ends of the condenser pipe (14) are connected to the water bath condenser (3) and the storage tank (15) respectively. The first air box (2) is connected to the condenser pipe (14) through a pipe, and the pipe passes through the water bath condenser (3).

3. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 1, characterized in that, The first air plate (28) is provided with a slag suction channel for adsorbing waste residue, and the first air box (2) is provided with a first storage box. The slag suction channel is connected to the first storage box through a pipe.

4. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 3, characterized in that, The bottom surface of the baffle plate (6) is provided with a first sliding groove (25), and a first electric slider (26) is slidably installed in the first sliding groove (25). The bottom end of the first electric slider (26) is connected to the first wind plate (28) through a second telescopic unit (27).

5. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 4, characterized in that, The baffle plate (6) is arc-shaped, and the first groove (25) extends along the arc surface of the baffle plate (6).

6. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 4, characterized in that, There are two first air plates (28), and the first air box (2) corresponds to the first air plate (28) one by one. The absorption channel and the slag suction channel are located in one of the first air plates (28), and the other first air plate (28) can blow air into the recovery box (1) through the first air box (2) corresponding to it.

7. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 1, characterized in that, The recycling bin (1) is equipped with a rotating unit for driving the mounting frame to rotate. The axis around which the mounting frame rotates is parallel to one side of the mounting frame, and the mounting frame can rotate to a vertical position.

8. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 7, characterized in that, The recycling bin (1) has two inner sidewalls that are opposite to each other, each having a second sliding groove (8) extending along the height direction of the recycling bin (1). A second electric slider (18) is slidably installed in each of the two second sliding grooves (8), and the rotating unit is set on the second electric slider (18).

9. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 8, characterized in that, The sealing assembly includes two first sealing plates (20) and two second sealing plates (21). The two first sealing plates (20) and the two second sealing plates (21) are disposed opposite to each other on the outside of the mounting frame, and each first sealing plate (20) and each second sealing plate (21) corresponds to one side of the mounting frame. The second sealing plate (21) is provided with a recess for the second electric slider (18) to extend out. The mounting frame has a first mounting groove (22) that slides with the first sealing plate (20) at each of the two corresponding positions of the first sealing plate (20). A third telescopic unit for driving the first sealing plate (20) to move is installed in the first mounting groove (22). The mounting frame has a second mounting groove (23) that slides with the second sealing plate (21) at each of the two corresponding positions of the second sealing plate (21). A fourth telescopic unit for driving the second sealing plate (21) to move is installed in the second mounting groove (23). The first sealing plate (20) and the second sealing plate (21) form an outer contour surface that is adapted to the inner contour surface of the recycling box (1) and abuts against each other.

10. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 9, characterized in that, The second sealing plate (21) is provided with a third sealing block (24), which is located above the second electric slider (18) and inserted into the second groove (8).

11. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 1, characterized in that, The mounting frame is provided with partitions (19) that correspond one-to-one with each of its sides, and the partitions (19) are connected end to end.

12. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 1, characterized in that, The bottom of the recycling bin (1) is provided with a support plate (11) and a second air plate (10). The support plate (11) and the second air plate (10) are both inclined and connected at the inclined downward end. A second air box (17) is installed at the bottom of the recycling bin (1). The second air box (17) is connected to the second air plate (10) through a pipe to make the second air plate (10) draw in air.

13. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 12, characterized in that, The bottom of the second air box (17) is connected to a second storage box for collecting waste residue.

14. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 13, characterized in that, There are two second air boxes (17). Both second air boxes (17) are connected to the second air plate (10) through pipes, and valves are installed in both pipes. One second air box (17) is used to draw air into the second air plate (10), and the other second air box (17) is used to blow air out of the second air plate (10).

15. The device for extracting and recovering VFAs from acidification fermentation liquid of kitchen waste according to claim 1, characterized in that, The outer wall of the recycling bin (1) is rotatably connected to a bin door (4).

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