Efficient pretreatment system and treatment method for kitchen waste

Abstract

The invention discloses an efficient pretreatment system and method for kitchen waste, and the pretreatment system comprises a material receiving and conveying unit, a first-stage hydraulic pulping and sorting unit, a second-stage hydraulic pulping and sorting unit, a solid-liquid separation unit, a desanding unit, an oil-water separation unit and an impurity conveying unit. According to the system, kitchen waste can be efficiently crushed into fine slurry through the two-stage hydraulic pulping and sorting unit, the pulping effect and the impurity removal rate are improved, organic matter loss is reduced, the fine slurry is subjected to deslagging and refining through the solid-liquid separation unit and the sand removal unit in sequence, follow-up equipment blockage or damage can be avoided, the operation safety of the system is improved, and the service life of the system is prolonged. According to the system, solid-liquid separation and oil-water separation of the kitchen waste can be effectively realized, so that convenience is provided for subsequent resource utilization, and the resource utilization efficiency is improved; when the system is applied to kitchen waste treatment, the pulping effect can be improved, follow-up treatment is facilitated, the follow-up treatment process is simplified, and the kitchen waste treatment speed and efficiency are improved.

Description

Technical Field

[0001] The present application relates to the technical field of food waste treatment, and in particular to a pretreatment system and treatment method capable of completely separating usable materials in food waste, maximizing resource utilization and reducing operating costs. Background Art

[0002] As waste generated from residents' daily lives and activities such as food processing and catering services, food waste has the characteristics of high moisture content, high organic matter content and easy perishability. If not handled properly, it can easily produce odor and pollute the environment. However, after scientific pretreatment and processing, food waste can also be converted into valuable resources, such as fertilizer, feed, biofuel and biogas.

[0003] The restaurant waste resource treatment industry currently uses the following restaurant waste treatment technology: before the restaurant waste enters the main treatment system, necessary pre-treatment processes such as storage, bag breaking, sorting, impurity removal, solid-liquid separation, etc. are adopted to remove inorganic impurities such as glass, ceramics, metals, plastics, rubber, sand and gravel from the restaurant waste, and then the organic matter in the restaurant waste is treated as a resource. The restaurant waste pre-treatment system is generally composed of receiving equipment, sorting equipment, crushing equipment and solid-liquid separation equipment, etc., which performs preliminary treatment on the restaurant waste to make it more suitable for subsequent deep treatment, such as anaerobic fermentation, high temperature hydrolysis treatment, aerobic fermentation, composting treatment, etc.

[0004] First, the collected food waste is transported to the processing plant by a special garbage collection truck and unloaded into the receiving hopper. The receiving hopper generally has a large volume and can temporarily store a certain amount of garbage. Its structural design can prevent the scattering of garbage and the overflow of odor. Garbage reception is an important process link in the treatment of food waste, which means the beginning of the transition from garbage collection to factory-based treatment. Garbage reception plays a role of connecting the past and the future, ensuring that the food waste collected by the garbage collection truck enters the receiving device smoothly, steadily, safely and environmentally friendly, and is transferred to the back-end processing equipment after preliminary drainage.

[0005] Sorting equipment is mainly used to separate large impurities in kitchen waste, such as plastic bottles, plastic bags, cans, glass bottles, tableware, fabrics and other inorganic components. If these impurities are not removed, they will affect the normal operation of subsequent processing equipment. Sorting generally adopts manual sorting or mechanical sorting. Although mechanical sorting can greatly improve sorting efficiency, there is a risk of missing selection, which affects the operating stability of the back-end equipment.

[0006] Crushing equipment generally adopts coarse crushing, fine crushing, hydraulic crushing and other methods to crush large pieces of kitchen waste after sorting, such as bones, large pieces of vegetable roots, etc., to reduce their size and facilitate subsequent further processing. The cutters of crushing equipment are generally strong and can withstand large impact forces. For example, a double-axis shearing crusher uses cutters on two relatively rotating shafts to shear and crush the garbage. Sometimes, in order to meet the needs of extracting oils and further recycling organic matter, it is necessary to crush the garbage more finely, break it into smaller particles, and make the particle size of the garbage more uniform. Crushing equipment generally has problems such as easy wear, poor sealing effect, and high operating failure rate.

[0007] Solid-liquid separation equipment generally uses high-speed centrifugal dehydration and extrusion dehydration to separate the solid residue and slurry of the crushed food waste. In actual operation, there is a common problem of incomplete solid-liquid separation, high water content of solid residue, and more solid residue impurities in the slurry, which affects the operating energy consumption and stability of the back-end food waste treatment equipment.

[0008] In addition to the above equipment, the food waste pretreatment system also needs to be equipped with the conveying equipment connected to the above equipment. The process equipment is complex, the operation efficiency is low, the equipment occupies a large area, and the equipment investment cost is very high. In addition, the traditional food waste pretreatment system equipment has problems such as easy clogging, odor leakage, rapid equipment wear, high energy consumption, complex process, low processing efficiency and poor pretreatment effect in specific applications, which affect the operation stability of the food waste treatment plant. Therefore, there are still many problems in the current process and equipment for the resource treatment of food waste. It is necessary to propose a new technical solution to solve the problems existing in the existing technology. Summary of the invention

[0009] The present application provides a highly efficient pretreatment system and treatment method for kitchen waste, which are used to solve the problem that the current kitchen waste resource treatment process is complex and inefficient.

[0010] In order to achieve the above objectives, this application provides the following technical solutions:

[0011] On the one hand, the present application provides an efficient pretreatment system for kitchen waste, including a material receiving and conveying unit, a primary hydraulic pulping and sorting unit, a secondary hydraulic pulping and sorting unit, a solid-liquid separation unit, a sand removal unit, an oil-water separation unit and an impurity conveying unit, wherein:

[0012] The material receiving and conveying unit is used for receiving the food waste and conveying the food waste to the feed port of the first-level hydraulic pulping and sorting unit; the first-level hydraulic pulping and sorting unit is used for crushing the food waste therein into coarse pulp and screening and removing impurities; the second-level hydraulic pulping and sorting unit is used for receiving the coarse pulp after screening and removing impurities and crushing it into fine pulp for a second time; the solid-liquid separation unit is used for separating the slurry and solid phase in the fine slurry; the sand removal unit receives the separated slurry and removes the sandy heavy residue in the slurry; the oil-water separation unit includes a pyrolysis tank and a three-phase centrifuge, the pyrolysis tank is used for receiving the slurry discharged from the sand removal unit and heating and keeping it warm, the three-phase centrifuge is used for receiving the slurry output from the pyrolysis tank and separating it into oil phase, liquid phase and solid phase; the impurity conveying unit is used for conveying the separated impurities to the target treatment point.

[0013] The above technical solution further includes a solid-liquid extrusion unit, and the filter residue screened from the coarse slurry is separated into solid residue and slurry by the solid-liquid extrusion unit, and the slurry is sent to the feed port of the first-level hydraulic pulping and sorting unit.

[0014] Furthermore, the material receiving and conveying unit includes a unloading platform, a collecting bin and a conveying device; the unloading platform is used to receive food waste transported by a food waste collection and transportation vehicle; the collecting bin is used to store the food waste and to roughly crush the food waste by a crushing mechanism arranged therein, and the crushing mechanism includes a rotating cutter disc and a crushing knife arranged on the rotating cutter disc; the conveying device is used to transport the food waste in the collecting bin to the feed inlet of the primary hydraulic pulping and sorting unit.

[0015] Furthermore, the first-stage hydraulic pulping and sorting unit includes a feeding device, a rotary hydraulic pulping device, a labyrinth-type discharging device and a rotary sorting device, wherein:

[0016] The feeding device comprises a barrel, a spiral rotor is horizontally arranged in the barrel, one end of the spiral rotor extends out of the barrel and is connected to the gear reducer, a feeding port is provided on the barrel, and the discharge end of the barrel is rotatably connected to the inlet end of the rotary hydraulic pulping device and is sealed by a sealing device;

[0017] The rotary hydraulic pulping equipment comprises a rotary drum, a rotary drive device for driving the rotary drum to rotate, and a plurality of disturbing bag breaking devices arranged in a spiral line along the central axis direction of the rotary drum; the disturbing bag breaking device comprises a support plate, a disturbing plate arranged on one side of the support plate, and a bag breaking knife installed on the disturbing plate, the disturbing plate is arranged obliquely in the rotary drum and forms an angle with the central axis of the rotary drum, and the disturbing plate is inclined toward the discharging direction of the rotary drum to push the material outward;

[0018] The labyrinth discharging equipment includes a plurality of discharging baffles, which are arranged in sequence at intervals at the discharging port of the rotary cylinder, each discharging baffle is provided with a discharging hole, and the discharging holes on any two adjacent discharging baffles are staggered;

[0019] The rotary sorting equipment includes an outer shell and a rotary screen arranged in the outer shell, a spiral belt is arranged in the rotary screen, a slurry collection area is formed between the rotary screen and the inner wall of the outer shell, and both ends of the rotary screen are sealed with the outer shell through labyrinth seals respectively; the inlet end of the rotary screen is connected with the outlet end of the labyrinth discharging equipment, the outlet end of the rotary screen is provided with a closing structure, and a screen-surface material discharging conveyor is arranged below the outlet end of the rotary screen, and a screen-surface material discharging port for outputting coarse slurry is arranged at the bottom of the outer shell.

[0020] Furthermore, the rotary drive device includes a rotary drive motor and a driving gear connected to the output end of the rotary drive motor. A rotary gear is arranged on the outer wall of the rotary cylinder. The disk surface of the rotary gear is arranged along the radial direction of the rotary cylinder. The driving gear and the rotary gear are adapted to mesh and transmit. The lower part of the rotary cylinder is supported by a supporting wheel, and the upper part of the rotary cylinder is positioned by an upper pressure wheel installed on a pressure wheel mounting frame. The feeding equipment, supporting wheel, rotary drive device and rotary sorting equipment are all installed on the equipment base.

[0021] Furthermore, the discharge holes on any two adjacent discharge baffles are staggered up and down and do not overlap each other, the discharge hole on one discharge baffle is close to the upper part of the rotating cylinder, and the discharge hole on the other discharge baffle is close to the lower part of the rotating cylinder.

[0022] Furthermore, the apertures of the sieve holes on the rotary sieve range from 25 mm to 80 mm;

[0023] Furthermore, a maintenance manhole is provided on the rotary drum, and an inspection quick-opening door is provided on the outer shell of the rotary sorting equipment.

[0024] Furthermore, the secondary hydraulic pulping and sorting unit includes a fine pulping device and a fine pulping drive device; the fine pulping device includes an equipment housing and a pulping main shaft horizontally arranged in the equipment housing, the passive end of the pulping main shaft passes through the equipment housing and is fitted and installed with the passive end bearing seat, the active end of the pulping main shaft passes through the equipment housing and is fitted and installed with the active end bearing seat, a sealing side cover is provided at the connection between the pulping main shaft and the equipment housing, a feed conveying spiral blade is provided on the side wall of the pulping main shaft near its active end, a discharge spiral blade and a discharge reverse spiral blade are provided on the side wall of the pulping main shaft near its passive end, a number of crushing chains are arranged in sequence between the discharge spiral blade and the feed conveying spiral blade, and the crushing chain is fastened to the pulping main shaft by fixing bolts.

[0025] Furthermore, an inlet is opened on the side wall of the equipment shell near the active end of the pulping main shaft, and the inlet is used to receive the coarse pulp output from the first-level hydraulic pulping and sorting unit. An upper outlet and a lower outlet are arranged on the outer wall of the equipment shell near its discharge end, and a control valve is arranged at the lower outlet.

[0026] Furthermore, the fine pulping driving device includes a fine pulping driving motor and a motor pulley connected to the output end of the fine pulping driving motor, and the motor pulley is connected to the driven pulley at the driving end of the pulping main shaft through a belt transmission.

[0027] Furthermore, the solid-liquid separation unit includes a solid-liquid separator.

[0028] Furthermore, the desander unit includes a cyclone desander and a high-concentration desander connected in sequence.

[0029] Furthermore, the pyrolysis tank includes a tank body and an interlayer arranged outside the tank body, a heating coil is arranged between the interlayer and the tank body, and a heat medium is poured into the heating coil.

[0030] On the other hand, the present application also provides a method for efficiently preprocessing kitchen waste, using the above-mentioned efficient kitchen waste preprocessing system, the method for efficiently preprocessing kitchen waste comprises the following steps:

[0031] S1: The food waste is transported to the primary hydraulic pulping and sorting unit through the material receiving and conveying unit. The primary hydraulic pulping and sorting unit crushes the food waste into coarse pulp and screens and removes impurities to obtain coarse pulp and filter residue;

[0032] S2: The coarse pulp is sent to the secondary hydraulic pulping and sorting unit for secondary crushing to obtain fine pulp;

[0033] S3: sending the fine slurry into a solid-liquid separation unit to separate the slurry and the solid phase;

[0034] S4: sending the slurry separated by the solid-liquid separation unit to the sand removal unit to remove the sandy heavy residue in the slurry;

[0035] S5: sending the slurry outputted from the sand removal unit into a pyrolysis tank for heating and heat preservation, and sending the slurry in the pyrolysis tank into a three-phase centrifuge for three-phase separation of oil phase, liquid phase and solid phase;

[0036] S6: The liquid phase separated by the three-phase centrifuge is sent to the primary hydraulic pulping and sorting unit for re-pulping and sorting.

[0037] In the above technical solution, the filter residue obtained in step S1 is further sent to a solid-liquid extrusion unit for extrusion treatment to obtain residue and slurry, and the extruded slurry is sent to a primary hydraulic pulping and sorting unit for re-pulping and sorting.

[0038] Compared with the prior art, this application has at least the following beneficial effects:

[0039] 1. The efficient pretreatment system for kitchen waste provided by the present application mainly includes a material receiving and conveying unit, a primary hydraulic pulping and sorting unit, a secondary hydraulic pulping and sorting unit, a solid-liquid separation unit, a sand removal unit, an oil-water separation unit and an impurity conveying unit. The system can efficiently crush the kitchen waste into fine slurry through the two-stage hydraulic pulping and sorting unit, improve the pulping effect and impurity removal rate, and reduce the loss of organic matter. The fine slurry is then successively deslagging and refined by the solid-liquid separation unit and the sand removal unit to avoid equipment blockage or damage, protect the three-phase separator, and improve the operating safety of the system. The oil-water separation unit can effectively realize the solid-liquid separation and oil-water separation of kitchen waste, provide convenience for subsequent resource utilization, and improve the efficiency of material utilization; furthermore, the system can ensure that the organic matter in the kitchen waste is as slurried as possible through the two-stage hydraulic pulping and sorting unit, which is convenient for subsequent treatment, simplifies the subsequent treatment process, and improves the treatment speed and efficiency of kitchen waste.

[0040] 2. The present application also uses a solid-liquid extrusion unit to extrude and dehydrate the filter residue after screening by the first-level hydraulic pulping and sorting unit. The extruded slurry can be sent to the first-level hydraulic pulping and sorting unit to continue to be used for pulping and sorting, thereby reducing the addition of external process water, reducing the amount of sewage treatment, and recycling the organic matter in the kitchen waste as much as possible. The residue after extrusion can be sent to the subsequent organic silo for recycling and treatment, thereby realizing efficient utilization of resources.

[0041] 3. In the present application, a crushing mechanism capable of coarsely crushing the food waste is arranged in the receiving bin of the material receiving and conveying unit, which can coarsely crush the food waste put into the two-stage hydraulic pulping and sorting unit to reduce the presence of large pieces of material, which can not only reduce the risk of transportation blockage and improve the stability of the system, but also make the material entering the subsequent hydraulic pulping and sorting unit more uniform, thereby improving the pulping and sorting efficiency.

[0042] 4. The first-level hydraulic pulping and sorting unit in this application adopts a segmented structure design and has multiple functional modules, including a feeding device, a rotary hydraulic pulping device, a labyrinth discharging device and a rotary sorting device in sequence. This segmented design can reduce the risk of system failure and improve the reliability of the overall operation, wherein: a spiral rotor is arranged in the barrel of the feeding device, which can effectively promote the uniform conveying and mixing of materials, improve the feeding speed and the continuity of material processing; a disturbance bag breaking device is arranged in the rotary hydraulic pulping device, which can effectively break the bagged materials, promote the decomposition of the materials and the generation of slurry, thereby improving the pulping efficiency; the labyrinth discharging device has a discharge hole on each discharge baffle plate, and any The discharge holes on two adjacent discharge baffles are staggered up and down and do not overlap with each other. For example, the discharge holes on adjacent discharge baffles are arranged at 180° to form a maze-like channel, which can effectively control the flow of slurry, enable the rotary hydraulic pulping equipment to maintain a high liquid level, and ensure the hydraulic pulping effect of the material; the setting of the rotary screen in the rotary sorting equipment can provide a larger screening area and promote the discharge of solid slag under the conveying action of the screw belt; the system can effectively prevent material leakage and avoid the spread of odor during the processing process through the sealing design between the barrel and the rotary hydraulic pulping equipment and the rotary screen, thereby reducing the failure rate during system operation and improving the overall stability and hygienic safety.

[0043] 5. The aperture of the sieve holes on the rotary screen in this application ranges from 25 mm to 80 mm. In specific applications, it can be configured according to process requirements. The larger the aperture, the less material on the sieve and the less organic matter loss.

[0044] 6. The secondary hydraulic pulping and sorting unit in the present application includes a fine pulping device and a fine pulping driving device. The feeding and conveying spiral blades are arranged on the pulping main shaft of the fine pulping device, which helps to improve the material conveying efficiency, ensure that the raw materials can quickly and evenly enter the pulping area, and reduce the risk of blockage; the discharge spiral blades on the pulping main shaft can help the slurry to maintain uniform distribution during the discharge process, ensure that the material can be discharged smoothly, and avoid blockage. At the same time, the discharge reverse spiral blades on the pulping main shaft can create a reverse flow direction, provide additional driving force during the material flow process, and help the slurry flow backward, thereby preventing Prevent the backflow or retention of materials; in addition, a crushing chain is arranged between the discharging spiral blade and the feeding conveying spiral blade, which can effectively increase the crushing force of the material and promote the full pulping of the material, thereby improving the fineness and uniformity of the slurry; an upper and a lower discharge port is arranged on the equipment shell of the fine pulping equipment. During normal operation, the material is discharged through the upper discharge port, and the shell of the fine pulping equipment can be controlled to be filled with slurry. The material can be repeatedly beaten and pulped. The lower discharge port is controlled by the control valve. When the equipment is to be shut down, the control valve is opened to empty the material in the shell of the fine pulping equipment so that the secondary fine pulping unit can be started smoothly when it is started again.

[0045] 7. The pyrolysis tank in the oil-water separation unit of the present application includes a tank body and an interlayer arranged outside the tank body. The interlayer heating method can avoid increasing the condensed water in the slurry, avoid excessive process water entering the material, and reduce the amount of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 creative work. It should be understood that the specific shapes and structures shown in the drawings should not usually be regarded as limiting conditions for implementing the present application; for example, based on the technical concepts and exemplary drawings disclosed in the present application, those skilled in the art are able to easily make routine adjustments or further optimizations to the increase / decrease / attribution division, specific shapes, positional relationships, connection methods, and dimensional ratios of certain units (components).

[0047] Figure 1 It is a structural schematic diagram of two-stage linkage hydraulic pulping and separation in the efficient pretreatment system of kitchen waste provided by the present application in one embodiment;

[0048] Figure 2 for Figure 1 A schematic diagram of the left view of the structure shown;

[0049] Figure 3 for Figure 1 A schematic diagram of the right side structure of the structure shown;

[0050] Figure 4 This is a schematic diagram of the structure of the feeding device in the present application in one embodiment;

[0051] Figure 5 It is a side view schematic diagram of the installation state of the disturbance bag breaking device in the present application in an embodiment in a rotary hydraulic pulping equipment;

[0052] Figure 6 This is a schematic diagram of the structure of six discharge baffles constituting the labyrinth-type discharge device of the present application in one embodiment;

[0053] Figure 7 A schematic diagram of the installation position of the spiral belt in the rotary screen in one embodiment;

[0054] Figure 8 This is a schematic diagram of the structure of a disturbance bag breaking device in an embodiment;

[0055] Fig. 9 for Figure 8 A schematic diagram of a top view structure;

[0056] Fig.10 A schematic diagram of the internal structure of a fine pulping device in an embodiment;

[0057] Fig.11 It is a schematic diagram of the structure of a fine pulping driving device in an embodiment.

[0058] Fig.12 The present invention is a process flow chart of a pretreatment method provided by the present application in one embodiment.

[0059] Description of reference numerals:

[0060] 1. Feeding equipment; 101. Gear reducer; 102. Feeding port; 103. Screw rotor; 104. Equipment bracket;

[0061] 2. Sealing device;

[0062] 3. Rotary hydraulic pulping equipment;

[0063] 4. Inspection manhole;

[0064] 5. Rotating gear;

[0065] 6. Disturbance bag breaking device; 601. Bag breaking knife; 602. Disturbance plate; 603. Support plate; 604. Bag breaking knife fixing bolt;

[0066] 7. Labyrinth discharging device; 701. First discharging baffle; 702. Second discharging baffle; 703. Third discharging baffle; 704. Fourth discharging baffle; 705. Fifth discharging baffle; 706. Sixth discharging baffle;

[0067] 8. Rotary screen; 801. Screw belt;

[0068] 9. Labyrinth seal;

[0069] 10. Rotary sorting equipment housing;

[0070] 11. Check the quick-open door;

[0071] 12. Discharging conveyor for screened material;

[0072] 13. Equipment base;

[0073] 14. Screened material discharge port;

[0074] 15. Fine pulping driving device; 1501. Fine pulping driving motor; 1502. Motor base; 1503. Motor pulley; 1504. Belt;

[0075] 16. Fine pulping equipment; 1601. Passive end bearing seat; 1602. Discharging reverse spiral blade; 1603. Discharging spiral blade; 1604. Crushing chain; 1605. Crushing chain mounting seat; 1606. Crushing chain fixing bolt; 1607. Pulping main shaft; 1608. Feeding and conveying spiral blade; 1609. Active end bearing seat; 1610. Sealing side cover; 1611. Driven pulley;

[0076] 17. Fine pulping equipment housing;

[0077] 18. Rotary drive device;

[0078] 19. Support wheel;

[0079] 20. Lower discharge port;

[0080] 21. Upper discharge port;

[0081] 22. Control valve;

[0082] 23. Upper pressing wheel;

[0083] 24. Upper pressure wheel mounting frame. DETAILED DESCRIPTION

[0084] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0085] In the description of this application: unless otherwise specified, "multiple" and "several" mean two or more. The terms "including", "comprising", "having" and the like in this application also mean "not limited to" (certain units, components, materials, steps, etc.).

[0086] The terms such as "upper", "lower", "left", "right", "middle", etc. used in this application are usually used to facilitate intuitive understanding by comparing with the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.

[0087] The present application provides an energy-saving and easy-to-maintain efficient pretreatment system and treatment method for food waste, which improves the food waste treatment efficiency and resource utilization rate through system structure optimization design and process improvement, and achieves the purpose of full utilization of the oil phase, solid phase and liquid phase in the food waste. The efficient pretreatment system and treatment method for food waste provided by the present application are described in detail through specific embodiments.

[0088] Embodiment 1

[0089] The present embodiment provides a high-efficiency pretreatment system for food waste, which is mainly composed of a material receiving and conveying unit, a primary hydraulic pulping and sorting unit, a secondary hydraulic pulping and sorting unit, a solid-liquid separation unit, a sand removal unit, an oil-water separation unit and an impurity conveying unit, wherein: the material receiving and conveying unit is used to receive food waste and convey the food waste to the feed inlet of the primary hydraulic pulping and sorting unit; the primary hydraulic pulping and sorting unit is used to crush the food waste therein into a coarse pulp and screen and remove impurities; the secondary hydraulic pulping and sorting unit is used to crush the food waste therein into a coarse pulp and screen and remove impurities; It is used to receive the coarse slurry after screening and impurity removal and crush it into fine slurry for the second time; the solid-liquid separation unit is used to separate the slurry and solid phase in the fine slurry; the sand removal unit receives the separated slurry and removes the sandy heavy residue in the slurry; the oil-water separation unit includes a pyrolysis tank and a three-phase centrifuge, the pyrolysis tank is used to receive the slurry discharged from the sand removal unit and heat it, the three-phase centrifuge is used to receive the slurry output from the pyrolysis tank and separate it into oil phase, liquid phase and solid phase; the impurity transport unit is used to transport the separated impurities to the target treatment point. The structure and function of each unit are described in detail below.

[0090] 1. Material receiving and conveying unit

[0091] In this embodiment, the material receiving and conveying unit mainly includes a discharge platform, a receiving bin and a conveying device, wherein: the discharge platform is used to receive food waste transported by a food waste collection and transportation vehicle; the receiving bin is used to store the food waste and to roughly crush the food waste by a crushing mechanism arranged therein, and the crushing mechanism includes a rotating cutter disc and a crushing knife arranged on the rotating cutter disc; the conveying device is used to transport the food waste in the receiving bin to the feed port of the primary hydraulic pulping and sorting unit.

[0092] In a specific application example, the food waste collection and transportation vehicle enters the factory and enters the unloading room after being weighed by the scale. The door of the unloading room is closed, and the vehicle opens the fast rolling door at the unloading chute to unload the material. This serves as the front end of the pretreatment process and also the front end of the treatment system. The material receiving and conveying unit in this application has a certain capacity, which can realize continuous or intermittent feeding of the food waste collection and transportation vehicle. The food waste collection and transportation vehicle unloads the food waste into the receiving bin through the unloading platform. The unloading platform acts as a buffer, and all materials enter the material receiving and conveying unit through the unloading platform. The discharging equipment of the material receiving and conveying unit can realize continuous discharging and conveying with adjustable flow rate to ensure the continuous operation of the back-end equipment.

[0093] The material receiving and conveying unit in the present application is provided with a crushing mechanism which combines a rotating cutter disc and a crushing knife, so as to coarsely crush the food waste and reduce the presence of large pieces of material. This can not only reduce the risk of conveying blockage and improve system stability, but also make the material entering the subsequent hydraulic pulping and sorting unit more uniform, thereby improving the pulping and sorting efficiency.

[0094] 2. Primary hydraulic pulping and separation unit

[0095] In this embodiment, the first-level hydraulic pulping and sorting unit mainly includes a feeding device 1, a rotary hydraulic pulping device 3, a labyrinth type discharging device 7 and a rotary sorting device.

[0096] See also Figure 1 , 4 The feeding device 1 includes a barrel, a spiral rotor 103 is horizontally arranged in the barrel, one end of the spiral rotor 103 extends out of the barrel and is connected to the gear reducer 101, and a feed port 102 is provided on the barrel. The food waste delivered by the front-end material receiving and conveying unit and the recycled sewage from the rear-end three-phase separator enter the primary hydraulic pulping and sorting unit from the feed port. Since there are more solids in the food waste, the feeding device 1 adopts the spiral rotor 103 for feeding, so that the food waste can smoothly enter the rotary hydraulic pulping device 3.

[0097] The discharge end of the barrel of the feed device 1 is rotatably connected to the inlet end of the rotary hydraulic pulping device 3 and is sealed via a sealing device 2. The setting of the sealing device 2 prevents the slurry inside the rotary hydraulic pulping device 3 from leaking when the rotary hydraulic pulping device 3 rotates.

[0098] See also Figure 1 , 5 The rotary hydraulic pulping equipment 3 mainly includes a rotary drum, a rotary drive device 18 for driving the rotary drum to rotate, and a plurality of disturbing bag breaking devices 6 arranged in a spiral line along the central axis direction of the rotary drum. The rotary drum can rotate under the driving action of the rotary drive device 18, so that the internal food waste rotates under the stirring action of the disturbing bag breaking device 6, and the organic solids in the food waste are beaten and rubbed under the action of water power, and the particle size gradually becomes smaller to form slurry.

[0099] See also Figure 5 , 8 9. The disturbance bag breaking device 6 mainly includes a support plate 603, a disturbance plate 602 arranged on one side of the support plate 603, and a bag breaking knife 601 installed on the disturbance plate 602. The disturbance plate 602 is arranged obliquely in the rotating cylinder and forms an angle with the central axis of the rotating cylinder. The disturbance plate 602 is inclined toward the discharging direction of the rotating cylinder to push the material out. In this application, the disturbance bag breaking device 6 is arranged in a spiral line, and the disturbance plate 602 is arranged obliquely to push the material to move from left to right. The bag breaking knife 601 on the disturbance bag breaking device can cut some bagged garbage in the kitchen garbage and release the garbage in the bag.

[0100] See also Figure 1 A maintenance manhole 4 is provided on the rotary hydraulic pulping equipment 3 to facilitate personnel to inspect and repair the disturbing bag breaking device 6.

[0101] See also Figure 1-3The rotary drive device 18 mainly includes a rotary drive motor and a driving gear connected to the output end of the rotary drive motor. A rotary gear 5 is arranged on the outer wall of the rotary cylinder. The disk of the rotary gear 5 is arranged along the radial direction of the rotary cylinder. The driving gear and the rotary gear 5 are adapted to mesh and transmit. The lower part of the rotary cylinder is supported by the supporting wheel 19, and the upper part of the rotary cylinder is positioned by the upper pressure wheel 23 installed on the pressure wheel installation frame, so as to ensure that the rotary hydraulic pulping equipment 3 can rotate rapidly under the driving action of the rotary drive device 18. The aforementioned feeding equipment 1, supporting wheel 19, rotary drive device 18 and rotary sorting equipment are all installed on the equipment base 13.

[0102] See also Figure 1 and Figure 6 The labyrinth discharging device 7 mainly includes a plurality of discharging baffles, which are arranged at intervals at the discharging port of the rotating cylinder. Each discharging baffle has a discharging hole, and the discharging holes on any two adjacent discharging baffles are staggered. In a specific embodiment, the discharging holes on any two adjacent discharging baffles are staggered up and down and do not overlap each other. The discharging hole on one discharging baffle is close to the upper part of the rotating cylinder, and the discharging hole on the other discharging baffle is close to the lower part of the rotating cylinder. Figure 6 In (a)-(f), in one example, a six-layer discharge baffle can be used, and the discharge holes on any two adjacent discharge baffles are arranged at 180 degrees to form a maze-like channel, which can enable the rotary hydraulic pulping equipment 3 to maintain a high liquid level and ensure the hydraulic pulping effect of the material.

[0103] See also Figure 1 , 7 The rotary sorting equipment mainly includes a rotary sorting equipment shell 10 and a rotary screen 8 arranged in the rotary sorting equipment shell 10, a spiral belt 801 is arranged in the rotary screen 8, a slurry collection area is formed between the rotary screen 8 and the inner wall of the shell, and both ends of the rotary screen 8 are sealed and connected to the shell through a labyrinth seal 9; the inlet end of the rotary screen 8 is connected to the outlet end of the labyrinth discharging device 7, the outlet end of the rotary screen 8 is provided with a closing structure, and a screen-surface material discharging conveyor 12 is arranged below the outlet end of the rotary screen 8, and a screen-surface material discharging port 14 for outputting coarse slurry is arranged at the bottom of the shell.

[0104] During the processing, the slurry is discharged from the labyrinth discharge device 7 to the rotary screen 8 of the rotary sorting device. The slurry with a smaller aperture than the rotary screen 8 passes through the rotary screen 8 and enters the rotary sorting screen under-screen discharge port 14 at the lower end. The solid matter with a larger aperture than the rotary screen 8 moves to the right under the conveying action of the screw belt 801 and falls into the screen over-screen discharge conveyor 12, and then is transported to the rear-end collection device or dehydration device by the screen over-screen discharge conveyor 12. In a specific application example, the aperture range of the rotary screen 8 is 25 to 80 mm, which can be configured according to actual process requirements. The larger the aperture, the less the screen over-screen amount and the less organic matter loss.

[0105] The present application sets a closing structure at the outlet end of the rotary screen 8, such as Figure 1 When the oversize material is transported, it needs to be lifted to a certain height before it can fall into the oversize material discharge conveyor 12 to prevent the slurry from flowing directly into the oversize material discharge conveyor 12.

[0106] In the present application, the rotary sorting device housing 10 is a slurry collection device, which is connected to the device base 13. The rotary sorting device housing 10 is connected to the rotary screen 8 through a labyrinth seal 9 to reduce the overflow of the slurry. The rotary sorting device housing 10 is provided with an inspection quick-opening door 11. Figure 1 , 3 , the lock can be opened to open the door to check the operation of the rotary screen 8 according to the operation needs.

[0107] Three, two-stage hydraulic pulping and sorting unit

[0108] In this embodiment, the secondary hydraulic pulping and separation unit mainly includes a fine pulping device 16 and a fine pulping driving device 15 .

[0109] like Figure 1 , 10 The fine pulping equipment 16 includes an equipment shell and a pulping main shaft 1607 horizontally arranged in the equipment shell. The passive end of the pulping main shaft 1607 passes through the equipment shell and is adapted to be installed with the passive end bearing seat 1601. The active end of the pulping main shaft 1607 passes through the equipment shell and is adapted to be installed with the active end bearing seat 1609. A sealing side cover 1610 is provided at the connection between the pulping main shaft 1607 and the equipment shell. A feeding and conveying spiral blade 1608 is provided on the side wall of the pulping main shaft 1607 near its active end. A discharging spiral blade 1603 and a discharging reverse spiral blade 1602 are provided on the side wall of the pulping main shaft 1607 near its passive end. A plurality of crushing chains 1604 are arranged in sequence between the discharging spiral blade 1603 and the feeding and conveying spiral blade 1608. The crushing chain 1604 is fastened to the pulping main shaft 1607 by fixing bolts.

[0110] In the present application, the secondary hydraulic pulping and sorting unit adopts a combination design of a spiral conveyor and a crushing chain 1604 to ensure that the undersize material entering from the rotary sorting undersize material outlet 14 is further crushed and pulped. Fig.11 The fine pulping drive device 15 includes a fine pulping drive motor 1501 and a motor pulley 1503 connected to the output end of the fine pulping drive motor 1501. The motor pulley 1503 is connected to a driven pulley 1611 at the active end of the pulping main shaft 1607 through a belt transmission. The pulping main shaft 1607 is driven by the fine pulping drive motor 1501 fixed on the motor base. The motor pulley 1503 drives the driven pulley 1611 on the pulping main shaft 1607 to rotate at a high speed through the belt 1504. The screened material entering from the rotary sorting screened material discharge port 14 is transported to the crushing chain 1604 setting area by the feeding conveying spiral blade 1608, and is repeatedly beaten by the crushing chain 1604 to become a slurry, and then discharged by the discharge reverse spiral blade 1602 and the discharge spiral blade 1603.

[0111] The equipment shell of the fine pulping equipment 16 is provided with an inlet on the side wall near the active end of the pulping main shaft 1607, and the inlet is used to receive the coarse pulp output from the primary hydraulic pulping and sorting unit. The outer wall of the fine pulping equipment shell 17 near its discharge end is provided with an upper discharge port 21 and a lower discharge port 20, and a control valve 22 is provided at the lower discharge port 20. When the equipment is operating normally, the material is discharged through the upper discharge port 21, and the equipment shell of the fine pulping equipment 16 can be controlled to be filled with slurry, and the material can be repeatedly beaten and pulped. The lower discharge port 20 is controlled by the control valve 22. When the equipment is to be shut down, the control valve 22 is opened to empty the material in the equipment shell, so that the secondary hydraulic pulping and sorting unit can be started smoothly when it is started again.

[0112] 4. Solid-liquid separation unit

[0113] The solid-liquid separation unit in the present application includes any specifications and models of solid-liquid separators that separate solid particles from liquids by physical, mechanical or chemical methods, such as gravity, centrifugal force or screening, such as sedimentation separators, filter presses or screening machines with solid-liquid separation functions.

[0114] 5. Sand removal unit

[0115] The desander unit in this application can use a cyclone desander and a high-concentration desander to remove sandy heavy materials (i.e., residues) in the slurry. The combination of the cyclone desander and the high-concentration desander can protect the three-phase centrifuge, improve separation efficiency, and extend the service life of the equipment.

[0116] During specific installation and application, the desander unit can be equipped with an automatic control system to monitor the desander effect and adjust the working parameters of the desander.

[0117] 6. Oil-water separation unit

[0118] In this embodiment, the oil-water separation unit mainly includes a pyrolysis tank and a three-phase centrifuge. The pyrolysis tank is used to receive the slurry discharged from the desanding unit and heat and insulate it. The three-phase centrifuge is used to receive the slurry output from the pyrolysis tank and separate it into an oil phase, a liquid phase and a solid phase. The pyrolysis tank mainly includes a tank body and an interlayer arranged outside the tank body. A heating coil is arranged between the interlayer and the tank body, and a heat medium is poured into the heating coil.

[0119] In a specific application example, the heating coil device in the oil-water separation unit of the present application can adopt an energy-saving and efficient heating method to reduce energy consumption and leachate. The pyrolysis tank can heat the slurry through the heat medium in the interlayer and maintain the heat preservation for 30-60 minutes, and then enter the three-phase centrifuge to achieve the separation of oil phase, solid phase and liquid phase, store the separated oil and fat, and the separated solid phase and liquid phase can be subsequently processed and applied.

[0120] 7. Impurity conveying unit

[0121] The impurity transport unit in the present application can be any device that can play a transmission role. The impurities separated during the processing of the system can be transported to the target processing point through the impurity transport unit, such as sending the impurities after sand removal and oil-water separation to the target processing point.

[0122] In a specific application installation example, a backup and override design can be added to the efficient pretreatment system for kitchen waste provided in this application to ensure that the equipment is easy to inspect and maintain, and that the system can continue to operate when some equipment is under maintenance or fails, without affecting the overall processing efficiency. For example, two pretreatment systems are configured at the same time, and a connection is provided between the equipment of the two systems so that when a certain equipment in a certain system fails, the corresponding equipment of the other system can be used as a backup; at the same time, for equipment that is prone to failure (such as sand removal units, etc.), in order to prevent the equipment of the two systems from failing at the same time, an override setting is adopted. By setting pipes and valves, it is possible to skip a certain process equipment or process through valve switching during the overall process, and troubleshooting can be completed as soon as possible without stopping the machine.

[0123] In addition, an intelligent monitoring system can be added to the system to monitor the operating status of each unit in real time and automatically adjust operating parameters as needed to improve processing efficiency and stability.

[0124] From the above, it can be seen that the efficient pretreatment system for food waste provided by the present application mainly includes the following functional modules: food waste unloading and receiving, two-stage hydraulic pulping and sorting, solid-liquid separation and sand removal, and thermal decomposition three-phase separation. In the present application, the first-stage hydraulic pulping and sorting unit integrates the pulping and screening into a structurally integrated design to achieve efficient pulping. After receiving the food waste, the two-stage hydraulic pulping and sorting unit first performs hydraulic crushing and coarse pulping through the first-stage pulping equipment, and screens and removes impurities from the coarsely crushed pulping slurry. The slurry after screening and impurity removal enters the second-stage pulping equipment to achieve further crushing and refinement of the slurry after screening and impurity removal, ensuring that the organic matter in the food waste is as slurried as possible, improving the pulping effect, and reducing the loss of organic matter; further, after the two-stage hydraulic pulping, The fine slurry obtained after sorting can be removed and refined in turn by the solid-liquid separation unit and the sand removal unit to avoid equipment blockage or damage, protect the three-phase separator, and improve the operating safety of the system; the oil-water separation unit can effectively realize the solid-liquid separation and oil-water separation of food waste, provide convenience for subsequent resource utilization, and improve the efficiency of material utilization; in addition, the system can ensure that the organic matter in the food waste is as slurried as possible through the two-stage hydraulic pulping and sorting unit, which is convenient for subsequent treatment, simplifies the subsequent treatment process, and improves the treatment speed and efficiency of food waste.

[0125] Embodiment 2

[0126] Compared with Example 1, the efficient pretreatment system for food waste provided in this embodiment adds a solid-liquid extrusion unit, which can separate the filter residue screened from the coarse slurry into solid residue and slurry. The extruded slurry can be sent to the feed inlet of the first-level hydraulic pulping and sorting unit to continue to be used for pulping and sorting, thereby reducing the addition of external process water, reducing the amount of sewage treatment, and recycling the organic matter in the food waste as much as possible. The residue after extrusion can be sent to the subsequent organic silo for recycling and treatment, thereby realizing efficient utilization of resources.

[0127] Embodiment 3

[0128] This embodiment provides a method for efficiently pre-treating food waste. The method is implemented by the efficient pre-treating system for food waste described in the first or second embodiment. Fig.12 , the main steps of the preprocessing method are as follows:

[0129] S1: The food waste is transported to the primary hydraulic pulping and sorting unit through the material receiving and conveying unit. The primary hydraulic pulping and sorting unit crushes the food waste into coarse pulp and screens and removes impurities to obtain coarse pulp and filter residue;

[0130] S2: The coarse pulp is sent to the secondary hydraulic pulping and sorting unit for secondary crushing to obtain fine pulp;

[0131] S3: sending the fine slurry into a solid-liquid separation unit to separate the slurry and the solid phase;

[0132] S4: sending the slurry separated by the solid-liquid separation unit to the sand removal unit to remove the sandy heavy residue in the slurry;

[0133] S5: sending the slurry outputted from the sand removal unit into a pyrolysis tank for heating and heat preservation, and sending the slurry in the pyrolysis tank into a three-phase centrifuge for three-phase separation of oil phase, liquid phase and solid phase;

[0134] S6: The liquid phase separated by the three-phase centrifuge is sent to the primary hydraulic pulping and sorting unit for re-pulping and sorting.

[0135] The filter residue obtained in step S1 can be sent to a solid-liquid extrusion unit for extrusion treatment to obtain residue and slurry, and the extruded slurry is sent to a primary hydraulic pulping and sorting unit for re-pulping and sorting.

[0136] It can be seen that the efficient pretreatment method for food waste provided in the present application mainly includes unloading and receiving, two-stage linkage hydraulic pulping and sorting, solid-liquid separation and sand removal, and pyrolysis three-phase separation.

[0137] The following is a detailed description of the process of pre-treating kitchen waste using the efficient kitchen waste pre-treatment system provided by the present application.

[0138] (1) The food waste collection and transportation truck enters the factory and is weighed on the scale before entering the unloading room. The door of the unloading room is closed, and the vehicle opens the fast rolling door at the unloading chute to unload the materials. As the front end of the pretreatment process, all materials enter the material receiving and conveying unit through the unloading platform for coarse crushing and are then sent to the primary hydraulic pulping and sorting unit.

[0139] (2) After the kitchen waste enters the rotary hydraulic pulping device 3 from the feeding device 1, it is broken up by the disturbance bag breaking device 6. The broken slurry passes through the labyrinth discharging device 7 and enters the rotary screen 8 of the rotary sorting device. The slurry enters the secondary hydraulic pulping and sorting unit below from the rotary sorting underscreen discharge port 14. The overscreen material is conveyed from the overscreen discharge conveyor 12 to the rear-end collection device or dewatering device.

[0140] (3) After the slurry enters the secondary hydraulic pulping and sorting unit, the slurry is further broken up by the rotation of the pulping main shaft 1607 and the crushing chain 1604. As the raw materials of the primary pulping enter, the slurry after the secondary pulping is first discharged from the upper discharge port 21 of the fine pulping equipment 16 to enter the next process. After all the primary crushed materials enter the secondary pulping, the lower discharge port 20 of the fine pulping equipment 16 is opened to discharge the slurry to enter the next process.

[0141] (4) The crushed slurry enters the solid-liquid separation unit, and the separated solid phase can be transported into the organic silo using a conveying device, and the liquid phase can be sent to the cyclone desander and the high-concentration desander for two-stage deslagging to remove the sandy heavy matter (residue) in the slurry. The residue enters the garbage transfer box, and the liquid phase is pumped into the pyrolysis tank.

[0142] (5) The slurry pumped into the pyrolysis tank is heated to 60-80°C through the interlayer and maintained for 30-60 minutes, and then pumped into a three-phase centrifuge to separate the oil phase, solid phase and liquid phase. The separated oil enters the oil storage tank for storage; the solid phase is transported into the organic silo using a conveying device; the separated liquid phase is partially cached in the regulating tank and partially enters the leachate storage tank.

[0143] In summary, the use of the high-efficiency food waste pretreatment system provided by the present application for food waste pretreatment can significantly improve the pulping effect and impurity removal rate through the two-stage hydraulic pulping technology, thereby improving the processing efficiency. The external interlayer heating method of the pyrolysis tank can prevent excessive process water from entering the material, reduce the amount of sewage treatment, and save water. In addition, the present application also effectively separates oil, organic matter, etc. through solid-liquid separation and sand removal and pyrolysis three-phase separation, thereby improving the efficiency of resource utilization.

[0144] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0145] The above is a relatively specific and detailed description of the present application through general description and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the scope of protection of the claims of the present application.

Claims

1. A highly efficient pretreatment system for kitchen waste, characterized in that: It includes material receiving and conveying unit, primary hydraulic pulping and sorting unit, secondary hydraulic pulping and sorting unit, solid-liquid separation unit, sand removal unit, oil-water separation unit and impurity conveying unit, among which: The material receiving and conveying unit is used to receive the food waste and convey the food waste to the feed port of the first-level hydraulic pulping and sorting unit; the first-level hydraulic pulping and sorting unit is used to crush the food waste therein into coarse pulp and screen and remove impurities; the second-level hydraulic pulping and sorting unit is used to receive the coarse slurry after screening and impurity removal and crush it into fine slurry for a second time; the solid-liquid separation unit is used to separate the slurry and solid phase in the fine slurry; the sand removal unit receives the separated slurry and removes the sandy heavy residue in the slurry; the oil-water separation unit includes a pyrolysis tank and a three-phase centrifuge, the pyrolysis tank is used to receive the slurry discharged from the sand removal unit and heat and keep it warm, and the three-phase centrifuge is used to receive the slurry output from the pyrolysis tank and separate it into oil phase, liquid phase and solid phase; the impurity conveying unit is used to convey the separated impurities to the target treatment point.

2. The efficient pretreatment system for kitchen waste according to claim 1, characterized in that: It also includes a solid-liquid extrusion unit, and the filter residue screened from the coarse slurry is separated into solid phase residue and slurry through the solid-liquid extrusion unit, and the slurry is sent to the feed port of the first-level hydraulic pulping and sorting unit.

3. The efficient pretreatment system for kitchen waste according to claim 1, characterized in that: The material receiving and conveying unit includes a discharge platform, a receiving bin and a conveying device; the discharge platform is used to receive food waste transported by a food waste collection and transportation vehicle; the receiving bin is used to store the food waste and to roughly crush the food waste by a crushing mechanism arranged therein, wherein the crushing mechanism includes a rotating cutter disc and a crushing knife arranged on the rotating cutter disc; the conveying device is used to convey the food waste in the receiving bin to the feed inlet of the primary hydraulic pulping and sorting unit.

4. The efficient pretreatment system for kitchen waste according to claim 1, characterized in that: The first-stage hydraulic pulping and sorting unit includes a feeding device, a rotary hydraulic pulping device, a labyrinth-type discharging device and a rotary sorting device, wherein: The feeding device comprises a barrel, a spiral rotor is horizontally arranged in the barrel, one end of the spiral rotor extends out of the barrel and is connected to a gear reducer, a feeding port is provided on the barrel, and the discharge end of the barrel is rotationally connected to the inlet end of the rotary hydraulic pulping device and is sealed by a sealing device; The rotary hydraulic pulping equipment comprises a rotary cylinder, a rotary drive device for driving the rotary cylinder to rotate, and a plurality of disturbing bag-breaking devices arranged in a spiral line along the central axis direction of the rotary cylinder; the disturbing bag-breaking device comprises a support plate, a disturbing plate arranged on one side of the support plate, and a bag-breaking knife installed on the disturbing plate, the disturbing plate is arranged obliquely in the rotary cylinder and forms an angle with the central axis of the rotary cylinder, and the disturbing plate is inclined toward the discharging direction of the rotary cylinder to push the material to be discharged; The labyrinth discharging device comprises a plurality of discharging baffles, which are arranged in sequence at intervals at the discharging port of the rotary cylinder, each of which is provided with a discharging hole, and the discharging holes on any two adjacent discharging baffles are staggered; The rotary sorting equipment includes a shell and a rotary screen arranged in the shell, a spiral belt is arranged in the rotary screen, a slurry collection area is formed between the rotary screen and the inner wall of the shell, and both ends of the rotary screen are sealed with the shell through labyrinth seals; the inlet end of the rotary screen is connected to the outlet end of the labyrinth discharging equipment, the outlet end of the rotary screen is provided with a closing structure, and a screen-surface material discharging conveyor is provided below the outlet end of the rotary screen, and a screen-surface material discharging port for outputting coarse slurry is provided at the bottom of the shell.

5. The efficient pretreatment system for kitchen waste according to claim 4, characterized in that: The rotary drive device includes a rotary drive motor and a driving gear connected to the output end of the rotary drive motor. A rotary gear is arranged on the outer wall of the rotary cylinder. The disk surface of the rotary gear is arranged along the radial direction of the rotary cylinder. The driving gear and the rotary gear are adapted to mesh and transmit. The lower part of the rotary cylinder is supported by a supporting wheel, and the upper part of the rotary cylinder is positioned by an upper pressure wheel installed on a pressure wheel mounting frame. The feeding equipment, supporting wheel, rotary drive device and rotary sorting equipment are all installed on the equipment base.

6. The efficient pretreatment system for kitchen waste according to claim 4 or 5, characterized in that: The discharge holes on any two adjacent discharge baffles are staggered and do not overlap each other, the discharge hole on one discharge baffle is close to the upper part of the rotary cylinder, and the discharge hole on the other discharge baffle is close to the lower part of the rotary cylinder; The aperture of the sieve holes on the rotary sieve is in the range of 25 mm to 80 mm; The rotary cylinder is provided with an inspection manhole, and the outer shell of the rotary sorting equipment is provided with an inspection quick-opening door.

7. The efficient pretreatment system for kitchen waste according to claim 1, characterized in that: The secondary hydraulic pulping and separation unit includes a fine pulping device and a fine pulping driving device; The fine pulping equipment comprises an equipment housing and a pulping main shaft horizontally arranged in the equipment housing, the passive end of the pulping main shaft passes through the equipment housing and is fitted with the passive end bearing seat, the active end of the pulping main shaft passes through the equipment housing and is fitted with the active end bearing seat, a sealing side cover is arranged at the connection between the pulping main shaft and the equipment housing, a feeding and conveying spiral blade is arranged on the side wall of the pulping main shaft close to its active end, a discharging spiral blade and a discharging reverse spiral blade are arranged on the side wall of the pulping main shaft close to its passive end, a plurality of crushing chains are arranged in sequence between the discharging spiral blade and the feeding and conveying spiral blade, and the crushing chain is fastened to the pulping main shaft by fixing bolts; An inlet is provided on the side wall of the equipment housing near the active end of the pulping main shaft, and the inlet is used to receive the coarse pulp output from the first-level hydraulic pulping and sorting unit. An upper outlet and a lower outlet are provided on the outer wall of the equipment housing near the discharge end thereof, and a control valve is provided at the lower outlet; The fine pulping driving device comprises a fine pulping driving motor and a motor pulley connected to the output end of the fine pulping driving motor, and the motor pulley is connected to the driven pulley at the driving end of the pulping main shaft through a belt transmission.

8. The efficient pretreatment system for kitchen waste according to claim 1, characterized in that: The solid-liquid separation unit comprises a solid-liquid separator; The desander unit comprises a cyclone desander and a high-concentration desander connected in sequence; The pyrolysis tank comprises a tank body and an interlayer arranged outside the tank body, a heating coil is arranged between the interlayer and the tank body, and a heat medium is poured into the heating coil.

9. A method for efficiently pretreating kitchen waste, characterized in that: The efficient food waste pretreatment system according to any one of claims 1 to 8 is adopted, and the efficient food waste pretreatment method comprises the following steps: S1: conveying the food waste to the primary hydraulic pulping and sorting unit through the material receiving and conveying unit, wherein the primary hydraulic pulping and sorting unit crushes the food waste into coarse pulp and screens and removes impurities to obtain coarse pulp and filter residue; S2: sending the coarse pulp into the secondary hydraulic pulping and separation unit for secondary crushing to obtain fine pulp; S3: sending the fine slurry into the solid-liquid separation unit to separate the slurry and the solid phase; S4: sending the slurry separated by the solid-liquid separation unit to the sand removal unit to remove sandy heavy residue in the slurry; S5: sending the slurry outputted from the desanding unit into the pyrolysis tank for heating and heat preservation, and sending the slurry in the pyrolysis tank into the three-phase centrifuge for three-phase separation of oil phase, liquid phase and solid phase; S6: sending the liquid phase separated by the three-phase centrifuge to the primary hydraulic pulping and sorting unit for re-pulping and sorting.

10. The method for efficient pretreatment of kitchen waste according to claim 9, characterized in that: The filter residue obtained in step S1 is sent to a solid-liquid extrusion unit for extrusion treatment to obtain residue and slurry, and the extruded slurry is sent to the first-level hydraulic pulping and sorting unit for re-pulping and sorting.

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