Equipment for extracting oil from kitchen waste slurry

Abstract

The present application relates to the technical field of kitchen waste treatment, and provides a kitchen waste slurry extraction and oil extraction equipment, including a grease concentration device and an extraction and oil extraction device; the grease concentration device includes a first closed reaction container, the left end of the first closed reaction container is provided with a slurry inlet, and the right end is provided with a sewage outlet; a gas releaser is provided in the first sewage layer of the first closed reaction container; a first extractant addition port is provided at the top of the first closed reaction container; a first scum outlet is provided at the left end of the scum layer; the extraction and oil extraction device includes a second closed reaction container, a scum inlet is provided at the left end of the second sewage layer of the second closed reaction container, and a second scum outlet is provided at the right end bottom of the extraction layer; a bubble generator is provided at the bottom of the second sewage layer; a second extractant addition port is provided at the top of the second closed reaction container; a spray assembly is provided in the second gas layer of the second closed reaction container; and an extraction liquid outlet is provided at the left end of the extraction layer. It has the advantages of high safety and low cost.

Description

Technical Field

[0001] The present application belongs to the technical field of food waste treatment, and more specifically, to a food waste slurry extraction and oil extraction device. Background Art

[0002] The food waste collected from restaurants, company canteens and home kitchens is rich in oil, which can be used as a resource after extraction and recycling, such as making biodiesel. The current food waste treatment industry generally pre-treats the food waste to make pulp, and then uses centrifugal, sedimentation or flotation methods to perform preliminary oil extraction on the pulp. The pulp after preliminary oil extraction still contains a certain amount of oil. The oil content of this part is low and is tightly combined with the material. Conventional separation methods are difficult to further separate, while the use of extraction methods has a better separation effect. However, when using existing centrifugal, column or tower, ultrasonic or microwave extraction equipment to extract oil from the pulp, the following problems exist:

[0003] (1) Domestic food waste treatment plants produce hundreds of tons to thousands of tons of food waste slurry every day. If existing extraction equipment is used to extract oil from such a large amount of slurry, there are problems such as large equipment size, high cost, large floor space, high operating cost, and poor economic benefits.

[0004] (2) The content of various types of particulate matter in the slurry is high, which can easily cause problems such as wear of centrifugal extraction equipment and blockage of column extraction equipment.

[0005] (3) The sealing of the equipment is difficult to ensure, and the safety risk is relatively high. The extraction agents used (such as petroleum ether, pentane, hexane, etc.) are volatile, flammable, explosive, toxic and harmful. Therefore, the equipment is required to have good and reliable sealing when used, and the reaction conditions should be mild, avoiding high temperature and high pressure conditions. Current extraction equipment generally uses an electric motor to drive the internal rotor or blades to rotate, thereby stirring or centrifuging the extracted materials. The shaft seal is prone to leakage after a long time, which poses a certain safety risk.

[0006] Therefore, it is necessary to develop a new extraction and oil extraction equipment suitable for kitchen waste slurry to overcome the shortcomings of existing extraction equipment. Utility Model Content

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the embodiments of the present application is to provide a device for extracting oil from kitchen waste slurry.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a food waste slurry extraction and oil extraction equipment, including: a fat concentration device and an extraction and oil extraction device;

[0009] The oil concentration device comprises: a first closed reaction container, wherein the left end of the first closed reaction container is provided with a slurry inlet, and the right end is provided with a sewage outlet; a sediment layer, a first sewage layer, a scum layer and a first gas layer are formed from bottom to top in the first closed reaction container; a gas releaser is provided at the bottom of the first sewage layer; a first extractant addition port is provided at the top of the first closed reaction container; a first scum outlet is provided at the left end of the scum layer, and the first scum outlet is connected to the oil extraction device;

[0010] The extraction and oil extraction device comprises: a second closed reaction container, in which a second sewage layer, an extraction layer and a second gas layer are formed from bottom to top; a scum inlet is provided at the left end of the second sewage layer, and a second scum outlet is provided at the right end bottom of the extraction layer; a bubble generator is provided at the bottom of the second sewage layer; a second extractant addition port is provided at the top of the second closed reaction container; a spray assembly is provided in the second gas layer of the second closed reaction container; and an extraction liquid outlet is provided at the left end of the extraction layer.

[0011] In one embodiment, a plurality of first partitions are arranged in the first closed reaction container to form a plurality of contact chambers, each of the contact chambers is provided with an inclined plate which divides the contact chamber into chamber A and chamber B, the bottoms of chamber A and chamber B are connected, and the top height of each inclined plate increases from left to right; the first sewage layers between adjacent contact chambers are connected by overflowing the top of the first partition, and the scum layers between adjacent contact chambers are connected by overflowing the top of the inclined plate.

[0012] In one embodiment, the first extractant addition port is arranged at the top of the A chamber at the far right end; the gas releaser is arranged at the bottom of the A chamber.

[0013] In one embodiment, each of the gas releasers is connected to an external pressure dissolved gas system through a first pipeline; a gas outlet is provided on the top of the first closed reaction container, an extractant condenser is provided at the gas outlet, and the gas outlet is connected to the pressure dissolved gas system.

[0014] In one embodiment, the sewage outlet is connected to the rightmost chamber B, and the sewage outlet is connected to the pressure dissolved air system through a second pipeline, and a sewage remover is provided on the second pipeline.

[0015] In one embodiment, a plurality of second partitions are arranged in the second closed reaction container to form a plurality of extraction chambers, and a connecting hole is arranged on the second partition at the junction of the second sewage layer and the extraction layer.

[0016] In one embodiment, the extraction layer at the far left end protrudes to the left to form a liquid outlet chamber, and a baffle is provided at the right end of the liquid outlet chamber, and the baffle is located above the left side of the second sewage layer; the extraction liquid outlet is connected to the liquid outlet chamber through a medium gravity settler.

[0017] In one embodiment, the number of the spray assemblies is one less than the number of the extraction chambers; the spray liquid of the spray assembly in the extraction chamber on the left side comes from the adjacent extraction chamber on the right side, and the second extractant addition port is arranged at the top of the extraction chamber at the far right end.

[0018] In one embodiment, the spray assembly includes an inverted U-shaped tube, a pump and a spray head, wherein the two ends of the U-shaped tube are respectively located in two adjacent extraction chambers, and the port at the right end is inserted into the extraction layer, and the port at the left end is provided with a spray head; the pump is arranged on the U-shaped tube and is located outside the second closed reaction container.

[0019] In one embodiment, the second gas layer is connected to the bubble generator via a third pipeline, and the third pipeline is also connected to a second gas supplement pipe.

[0020] The beneficial effects of the food waste slurry extraction and oil extraction equipment provided in the present application are: the extraction equipment first enriches, concentrates and separates the oil-containing substances in the slurry, and then extracts and extracts oil from the concentrate. Compared with directly extracting and extracting oil from the slurry, it can greatly reduce the amount of extraction materials and the consumption of extraction agent, reduce the volume of the extraction equipment, and reduce the equipment cost and operating cost; the overall structure of the equipment is simple, without small holes and high-speed running parts, and is not easy to be blocked and worn; gas agitation is used instead of mechanical agitation, there is no mechanical stirring device, the sealing is good, and the risk of leakage of the extraction agent is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A simplified structural schematic diagram of a fat concentration device in a kitchen waste slurry extraction and oil extraction device provided in an embodiment of the present application;

[0023] Figure 2 This is a simplified structural schematic diagram of the extraction and oil extraction device in the food waste slurry extraction and oil extraction equipment provided in an embodiment of the present application.

[0024] Among them, the reference numerals in the figure are:

[0025] 1. Grease concentration device; 11. First closed reaction vessel; 12. Slurry inlet; 13. Sewage outlet; 14. Gas releaser; 15. First extractant addition port; 16. First scum outlet; 17. First baffle; 18. Inclined plate; 19. Pressure gas dissolution system; 101. Gas outlet; 102. Extractant condenser; 103. Sewage remover; 104. First air supply pipe; 105. First slag discharge pipe; Z. Sludge layer; W1. First sewage layer; F. Scum layer; Q1. First gas Layer; 2, extraction and oil extraction device; 21, second closed reaction container; 22, scum inlet; 23, second scum outlet; 24, bubble generator; 25, second extractant addition port; 26, spray assembly; 261, U-shaped tube; 262, spray head; 27, extraction liquid outlet; 28, second partition; 29, connecting hole; 201, baffle; 202, second air supply pipe; 203, gravity settler; 204, second slag discharge pipe; W2, second sewage layer; C, extraction layer; Q2, second gas layer. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] like Figure 1-Figure 2 As shown, a device for extracting oil from a slurry of food waste provided in an embodiment of the present application is now described. The device for extracting oil from a slurry of food waste comprises: a fat concentration device 1 and an extraction and oil extraction device 2 .

[0031] like Figure 1 As shown, the oil concentration device 1 includes: a first closed reaction container 11, the first closed reaction container 11 has good airtightness, and its internal space is divided into a sediment layer Z, a first sewage layer W1, a scum layer F and a first gas layer Q1 from bottom to top in the vertical direction; wherein the first gas layer Q1 mainly includes a mixed gas such as air, an inert gas, and a gaseous extractant, and the pressure of the first gas layer Q1 is maintained at normal pressure, the scum layer F is mainly a mixture of the extractant and the oil-containing substance in the food waste slurry, the sewage layer is mainly a mixture of water and the hydrophilic substance and suspended matter in the food waste slurry, and the sediment layer Z is large particles in the food waste slurry.

[0032] The left end of the first closed reaction container 11 is provided with a slurry inlet 12 for the entry of kitchen waste slurry; the right end is provided with a sewage outlet 13 for discharging sewage. A gas releaser 14 is provided at the bottom of the first sewage layer W1, and a first scum outlet 16 is provided at the left end of the scum layer F. The first scum outlet 16 is connected to the extraction and oil extraction device 2. The tiny bubbles released by the gas releaser 14 are fully in contact with the slurry. The oil-containing substances in the slurry are insoluble in water and have a lower density than water. They quickly float up under the entrainment and flushing of the tiny bubbles, and combine with the extractant in the scum layer F to form an oil-containing scum layer F. The oil-containing scum flows out from the first scum outlet 16 and enters the extraction and oil extraction device 2. The top of the first closed reaction container 11 is provided with a first extractant addition port 15 for replenishing the extractant. The bottom of the sediment layer Z is provided with a first slag discharge pipe 105 for discharging the precipitated slag.

[0033] Preferably, in this embodiment, a plurality of first partitions 17 are arranged in the first closed reaction container 11, and the first partitions 17 are arranged in the first sewage layer W1. The first closed reaction container 11 is divided into a plurality of contact chambers in the horizontal direction by the plurality of first partitions 17. The leftmost contact chamber connected to the slurry inlet 12 is the first contact chamber, and the second contact chamber, the third contact chamber, ..., the Nth contact chamber are arranged to the right, and N≥1; each contact chamber is provided with an inclined plate 18 for dividing it into chamber A and chamber B, and the inclined plate 18 is located in the scum layer F and the first sewage layer W1. The bottom of chamber A and chamber B are connected, and chamber A and chamber B are funnel-shaped space areas, the area of ​​chamber A is wide at the top and narrow at the bottom, and the area of ​​chamber B is narrow at the top and wide at the bottom; the top height of each inclined plate 18 increases from left to right; that is, the height of the first inclined plate 18 in the first contact chamber is lower than the height of the second inclined plate 18 in the second contact chamber, and the height of the second inclined plate 18 in the second contact chamber is lower than the height of the third inclined plate 18 in the third contact chamber, and so on. Specifically, the height of the first inclined plate 18 is 1-10 cm lower than that of the second inclined plate 18 ; the height of the second inclined plate 18 is 1-10 cm lower than that of the third inclined plate 18 , and so on. The purpose of such arrangement is to facilitate the scum to flow from right to left.

[0034] Specifically, the slurry inlet 12 is arranged at the upper position of the chamber A area of ​​the first contact chamber, and the kitchen waste slurry enters from it. The scum layer F above the slurry inlet 12 is provided with a first scum outlet 16, and the concentrated oily matter flows out from it.

[0035] In this embodiment, the first sewage layers W1 between adjacent contact chambers are connected through the top of the overflow first partition plate 17, and the sewage flows from left to right; the scum layers F between adjacent contact chambers are connected through the top of the overflow inclined plate 18; the scum flows from right to left.

[0036] In this embodiment, the first extractant addition port 15 is arranged at the top of the rightmost chamber A, that is, the first extractant addition port 15 is arranged above the last contact chamber, thereby supplementing the extractant; the sewage outlet 13 is arranged in the chamber B area of ​​the last contact chamber, and the gas releaser 14 is arranged at the bottom of chamber A.

[0037] Specifically, each gas releaser 14 is connected to an external pressure dissolved gas system 19 through a first pipeline; the pressure dissolved gas system 19 is used to generate micro bubbles. A gas outlet 101 is provided at the top of the first closed reaction vessel 11, and the gas outlet 101 is provided with an extractant condenser 102, and the gas outlet 101 is connected to the pressure dissolved gas system 19. The mixed gas in the first gas layer Q1 is cooled by the extractant condenser 102, and the gaseous extractant therein is condensed and liquefied and returned to the first closed reaction vessel 11; the remaining gas after condensation enters the pressure dissolved gas system 19 to generate dissolved gas water, and then passes through the gas releaser 14 to generate micro bubbles.

[0038] In the embodiment, the sewage outlet 13 is connected to the rightmost chamber B, and the sewage outlet 13 is connected to the pressure dissolved gas system 19 through a second pipe. Part of the sewage at the sewage outlet 13 can flow into the pressure dissolved gas system 19 through the second pipe. A sewage remover 103 is provided on the second pipe. The sewage remover 103 can filter and remove large particles of impurities in the sewage to prevent them from clogging the pressure dissolved gas system 19 and the gas releaser 14. A first air supply pipe 104 is also connected to the first pipe. The first air supply pipe 104 is used to provide new air to ensure the pressure balance of the first gas layer Q1.

[0039] The working process of the grease concentration device 1 is as follows: the kitchen waste slurry enters the upper part of the A chamber area of ​​the first contact chamber from the slurry inlet 12, and is fully contacted with the tiny bubbles released by the gas releaser 14. The oily substances in the slurry, which are insoluble in water and have a lower density than water, quickly float up under the entrainment and flushing of the microbubbles, and combine with the extractant in the scum layer F to form an oily scum layer F, and the oily scum flows out from the first scum outlet 16. A small part of the oily substances in the slurry will mix with the sewage, flow from the upper part of the A chamber area to the bottom, and then enter the B chamber area, and flow from the upper part of the B chamber area to the A chamber area of ​​the second contact chamber by overflowing the first partition 17, and again fully contacted with the tiny bubbles released by the bubble generator 24 in this area, and further float the oily substances in the slurry to the scum layer F, and then the slurry flows downward from the A chamber area to the B chamber area, and so on, until it enters the B chamber area of ​​the last contact chamber, and finally flows out from the sewage outlet 13.

[0040] The scum layer F above the last contact chamber is continuously supplemented with extractant through the first extractant addition port 15, and the excess extractant will carry the oil-containing substances in the scum layer F and flow into the scum layer F above the previous contact chamber due to the height difference of the inclined plate 18, and so on, until it flows into the scum layer F above the first contact chamber, and finally flows out from the first scum outlet 16. The gas escaping from the scum layer F enters the first gas layer Q1, and then passes through the extractant condenser 102, which condenses the gaseous extractant in the gas into liquid and refluxes it into the oil and fat concentration device 1, and the remaining gas enters the pressure gas solution system 19. Part of the sewage flowing out of the sewage outlet 13 enters the sewage slag remover 103, which can filter and remove large particle impurities in the sewage to prevent them from clogging the pressure gas dissolution system 19 and the gas releaser 14. The sewage after slag removal enters the pressure gas dissolution system 19, and the pressure gas dissolution system 19 produces dissolved gas water, which is released into the A chamber area of ​​each contact chamber through the gas releaser 14 to form tiny bubbles. The tiny bubbles contact the food waste slurry in the A chamber area, and the oil-containing substances in the slurry float to the scum layer F with the bubbles to form concentrated oil-containing substances. Solid particles with a density greater than that of water in the slurry are deposited in the scum layer Z and discharged through the first slag discharge pipe 105. After the food waste slurry is processed by the above process, 97% of the oil-containing substances can be separated from the slurry and concentrated together. The volume of the concentrated oil-containing substances is reduced by more than half of the total volume of the food waste slurry, which can greatly save the volume, cost and operation cost of the subsequent extraction and oil extraction device 2.

[0041] like Figure 2 As shown, in this embodiment, the extraction and oil extraction device 2 includes: a second closed reaction container 21, the second closed reaction container 21 has good airtightness, and its internal space is divided into a second sewage layer W2, an extraction layer C and a second gas layer Q2 from bottom to top in the vertical direction. The second gas layer Q2 includes a mixed gas such as air, an inert gas, and a gaseous extractant, and the pressure of the second gas layer Q2 is maintained at normal pressure. The extraction layer C includes an extractant and scum, and the water layer is clean water or sewage.

[0042] Specifically, a scum inlet 22 is provided at the leftmost end of the second sewage layer W2, and the scum inlet 22 is connected to the first scum outlet 16 through a pipeline. A second scum outlet 23 is provided at the bottom of the right end of the extraction layer C for discharging the scum after oil extraction. A second scum discharge pipe 204 is provided at the bottom of the second sewage layer W2 for discharging the scum after precipitation.

[0043] In this embodiment, a plurality of second partitions 28 are arranged in the second closed reaction container 21, and the plurality of second partitions 28 form a plurality of extraction chambers in the second closed reaction container 21 in the lateral direction. A connecting hole 29 is arranged on the second partition 28 at the junction of the second sewage layer W2 and the extraction layer C, and the connecting hole 29 allows the scum and sewage to flow to the right. In this embodiment, the extraction chamber at the far left is the first extraction chamber, and the second extraction chamber, the third extraction chamber, and the Nth extraction chamber are arranged to the right, and N≥1. The second partition 28 is also provided with a connecting hole 29 in the second gas layer, and the gas flows freely.

[0044] In this embodiment, a bubble generator 24 is provided at the bottom of the sewage layer of each extraction chamber to form small bubbles in the water layer. A second extractant addition port 25 is provided at the top of the second closed reaction vessel 21; a spray assembly 26 is provided in the second gas layer of the second closed reaction vessel 21; and an extractant outlet 27 is provided at the left end of the extraction layer C. Specifically, the number of spray assemblies 26 is one less than the number of extraction chambers; no spray assembly 26 is provided in the rightmost extraction chamber, wherein the spray liquid of the spray assembly 26 in the left extraction chamber comes from the adjacent right extraction chamber, that is, the spray liquid of the first extraction chamber comes from the second extraction chamber, and the spray liquid of the second extraction chamber comes from the third extraction chamber, and so on. Among them, the second extractant addition port 25 is provided at the top of the rightmost extraction chamber where no spraying crime is provided. The spray assembly 26 includes an inverted U-shaped tube 261, a pump and a spray head 262. The two ends of the U-shaped tube 261 are respectively located in two adjacent extraction chambers, and the port at the right end is located low and inserted into the extraction layer C, and the port at the left end is located high and located in the second gas layer and is provided with a spray head 262; the pump is arranged on the U-shaped tube 261 and located outside the second closed reaction container 21. The function of the spray assembly 26 is to gradually spray the extractant from right to left to achieve extraction and oil extraction.

[0045] In this embodiment, the leftmost extraction layer C protrudes to the left to form a liquid outlet chamber, and a baffle plate 201 is provided at the right end of the liquid outlet chamber, and the baffle plate 201 is located above the left side of the second sewage layer W2, so that the scum will not directly enter the liquid outlet chamber after entering the leftmost extraction chamber, and bubbles are prevented from escaping from the extraction liquid outlet 27. The extraction liquid outlet 27 is connected to the liquid outlet chamber through the medium gravity settler 203, and the flow rate of the extraction liquid in the gravity settler 203 is lower than 0.1 mm / s, so that the scum and the extraction liquid are separated under the action of gravity.

[0046] In this embodiment, the second gas layer Q2 is connected to the bubble generator 24 through a third pipe. The third pipe is provided with an air pump for recycling the gas. At the same time, the third pipe is also connected to a second air supply pipe 202 for replenishing new air to maintain pressure balance.

[0047] The working process of the oil extraction device 2 is as follows: the scum enters the upper part of the second sewage layer W2 of the first extraction chamber (the leftmost extraction chamber) from the scum inlet 22, enters the extraction layer C under the flushing of small bubbles generated by the bubble generator 24 and fully contacts the extractant, and the bubbles can stir the scum carefully and violently, increase the contact area between the scum and the extractant, and improve the mass transfer rate of the oil in the scum to the extractant. As the amount of scum increases, part of the scum will enter the extraction layer C of the second extraction chamber through the connecting hole 29 on the second partition plate 28, continue to fully contact the extractant under the flushing of small bubbles, and so on, until it enters the last extraction chamber and is finally discharged from the second scum outlet 23. The extraction layer C of the rightmost extraction chamber will be continuously replenished with extraction agent, and the excess extraction agent will be drawn out by the spray assembly 26 and sprayed onto the extraction layer C of the previous extraction chamber, and so on, until it is sprayed onto the extraction layer C of the first extraction chamber and discharged from the extraction liquid outlet 27. The above process can realize the efficient and low-cost extraction of oil and fat in the scum.

[0048] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A kitchen waste slurry extraction and oil extraction equipment, characterized in that: include: A fat concentration device (1) and an oil extraction device (2); The oil concentration device (1) comprises: a first closed reaction container (11), wherein the left end of the first closed reaction container (11) is provided with a slurry inlet (12), and the right end is provided with a sewage outlet (13); a sediment layer (Z), a first sewage layer (W1), a scum layer (F) and a first gas layer (Q1) are formed from bottom to top in the first closed reaction container (11); a gas releaser (14) is provided at the bottom of the first sewage layer (W1); a first extractant addition port (15) is provided at the top of the first closed reaction container (11); a first scum outlet (16) is provided at the left end of the scum layer (F), and the first scum outlet (16) is connected to the oil extraction device (2); The oil extraction device (2) comprises: a second sealed reaction container (21), wherein a second sewage layer (W2), an extraction layer (C) and a second gas layer (Q2) are formed from bottom to top in the second sealed reaction container (21); a scum inlet (22) is provided at the left end of the second sewage layer (W2), and a second scum outlet (23) is provided at the right end bottom of the extraction layer (C); a bubble generator (24) is provided at the bottom of the second sewage layer (W2); a second extractant addition port (25) is provided at the top of the second sealed reaction container (21); a spray assembly (26) is provided in the second gas layer (Q2) of the second sealed reaction container (21); and an extractant outlet (27) is provided at the left end of the extraction layer (C).

2. The equipment for extracting oil from kitchen waste slurry according to claim 1, characterized in that: A plurality of first partitions (17) are arranged in the first closed reaction container (11) to form a plurality of contact chambers. Each contact chamber is provided with an inclined plate (18) for dividing the contact chamber into chamber A and chamber B. The bottoms of chamber A and chamber B are connected, and the top heights of the inclined plates (18) increase from left to right. The first sewage layers (W1) between adjacent contact chambers are connected by overflowing the top of the first partition (17), and the scum layers (F) between adjacent contact chambers are connected by overflowing the top of the inclined plate (18).

3. The equipment for extracting oil from kitchen waste slurry as claimed in claim 2, characterized in that: The first extractant addition port (15) is arranged at the top of the A chamber at the rightmost end; the gas releaser (14) is arranged at the bottom of the A chamber.

4. The equipment for extracting oil from kitchen waste slurry as claimed in claim 2, characterized in that: Each of the gas releasers (14) is connected to an external pressure dissolved gas system (19) through a first pipeline; a gas outlet (101) is provided at the top of the first closed reaction container (11), and an extractant condenser (102) is provided at the gas outlet (101), and the gas outlet (101) is connected to the pressure dissolved gas system (19).

5. The equipment for extracting oil from kitchen waste slurry as claimed in claim 4, characterized in that: The sewage outlet (13) is connected to the rightmost chamber B, and the sewage outlet (13) is connected to the pressure gas dissolving system (19) through a second pipeline, and a sewage remover (103) is provided on the second pipeline.

6. The equipment for extracting oil from kitchen waste slurry according to any one of claims 1 to 5, characterized in that: A plurality of second partitions (28) are arranged in the second sealed reaction container (21) to form a plurality of extraction chambers. A connecting hole (29) is arranged on the second partition (28) at the junction of the second sewage layer (W2) and the extraction layer (C).

7. The equipment for extracting oil from kitchen waste slurry as claimed in claim 6, characterized in that: The extraction layer (C) at the leftmost end protrudes to the left to form a liquid outlet chamber, and a baffle (201) is provided at the right end of the liquid outlet chamber, and the baffle (201) is located above the left side of the second sewage layer (W2); the extraction liquid outlet (27) is connected to the liquid outlet chamber through a medium gravity settler (203).

8. The equipment for extracting oil from kitchen waste slurry as claimed in claim 7, characterized in that: The number of the spray assemblies (26) is one less than the number of the extraction chambers; the spray liquid of the spray assembly (26) in the extraction chamber on the left side is derived from the adjacent extraction chamber on the right side, and the second extractant addition port (25) is arranged at the top of the extraction chamber at the far right end.

9. The equipment for extracting oil from kitchen waste slurry as claimed in claim 8, characterized in that: The spray assembly (26) comprises an inverted U-shaped tube (261), a pump and a spray head (262); the two ends of the U-shaped tube (261) are respectively located in two adjacent extraction chambers, and the port at the right end is inserted into the extraction layer (C), and the port at the left end is provided with the spray head (262); the pump is arranged on the U-shaped tube (261) and is located outside the second closed reaction container (21).

10. The equipment for extracting oil from kitchen waste slurry as claimed in claim 8, characterized in that: The second gas layer (Q2) is connected to the bubble generator (24) via a third pipeline, and the third pipeline is also connected to a second gas supply pipe (202).

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