Kitchen waste pretreatment device and pretreatment method

Abstract

The present invention provides a kitchen waste pretreatment device and a pretreatment method, which can sort out non-degradable substances in kitchen waste, improve the efficiency of anaerobic fermentation, and extend the life of anaerobic fermentation equipment. The bag breaker is connected to a manual sorting belt conveyor; the manual sorting belt conveyor is connected to an extruder feeding belt conveyor; the extruder feeding belt conveyor is connected to an extruder; the extruder is connected to an extrusion dry material discharge belt conveyor and an extrusion wet material collection and conveying screw machine; the extrusion dry material discharge belt conveyor is connected to a dry material buffer belt bin; the extrusion wet material collection and conveying screw machine is connected to a slurry inlet; the hydraulic pulp washer is connected to a sand and water separator; the fine grid is connected to a screw press; the sand and water separator is connected to a kitchen waste desanding tank and a garbage bin; the kitchen waste desanding tank is connected to a circulating sand discharge pump; the circulating sand discharge pump is connected to a cyclone desanding device; the kitchen waste desanding tank is connected to a discharge screw pump, and the discharge screw pump is connected to an anaerobic system; the cyclone desanding device is connected to the kitchen waste desanding tank.

Description

Technical Field

[0001] The invention relates to a kitchen waste pretreatment device and a pretreatment method, which are mainly used for kitchen waste treatment. Background Art

[0002] Kitchen waste mainly refers to the waste generated in daily life and catering services, including discarded vegetable leaves, fruit peels, eggshells, bones, fruit cores and other food waste and food residues. Compared with other domestic waste, kitchen waste is rich in organic matter and high in water content. It is easy to rot and stink in a short time, breed mosquitoes and flies, and pollute the surrounding environment. In daily life, people usually mix kitchen waste with domestic waste, put it in plastic bags and throw it into the trash can, send it to the incinerator for incineration or landfill. It is not appropriate to mix kitchen waste and domestic waste together. If it is treated by direct incineration, because the moisture content of kitchen waste is high and the calorific value is low, it will cause incomplete combustion in the incinerator and produce harmful substances such as dioxins; if it is treated by landfill, because the moisture content and salt content of kitchen waste are high, it is easy to produce a large amount of leachate, which may affect groundwater and soil. Therefore, it is necessary to carry out special treatment of kitchen waste.

[0003] At present, the mainstream kitchen waste treatment technology in China is anaerobic fermentation. The organic matter in the kitchen waste is degraded into small molecular organic acids under the action of anaerobic bacteria and finally converted into biogas. However, the collected kitchen waste usually contains other non-degradable household waste, such as plastic sheets, glass bottles, etc. These substances cannot participate in the anaerobic fermentation reaction; in addition, the kitchen waste also contains small particles of inert substances such as sand and gravel, which will wear out the anaerobic reactor and accumulate in the anaerobic reactor, affecting the efficiency of anaerobic fermentation. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a kitchen waste pretreatment device and pretreatment method with a reasonable structural design, which can sort out non-degradable substances in kitchen waste, improve the efficiency of anaerobic fermentation, and extend the life of anaerobic fermentation equipment.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: a kitchen waste pre-treatment device, characterized in that: it comprises a kitchen waste pre-treatment system and a kitchen waste wet material pre-treatment system;

[0006] The kitchen waste pre-treatment system includes a garbage grab crane, a chain conveyor, a bag breaker, a manual sorting belt conveyor, an iron remover 1, an iron material buffer bin 1, a transfer belt conveyor, an extruder feeding belt conveyor, an extruder, an extruded dry material discharging belt conveyor, an iron remover 2, an iron material buffer bin 2, a dry material buffer bin, an extruded wet material collecting and conveying screw 1 and an extruded wet material collecting and conveying screw 2; the garbage grab crane cooperates with the bag breaker through the chain conveyor; the bag breaker is connected to the manual sorting belt conveyor; the manual sorting belt conveyor is provided with an iron remover 1; The first iron remover is connected to the first iron material buffer bin; the manual sorting belt conveyor is connected to the extruder feeding belt conveyor through the transfer belt conveyor; the extruder feeding belt conveyor is connected to the inlet of the extruder; the dry material outlet of the extruder is connected to the extrusion dry material discharging belt conveyor, and the wet material outlet is connected to the extrusion wet material collecting and conveying screw one; the extrusion dry material discharging belt conveyor is provided with the second iron remover; the second iron remover is connected to the second iron material buffer bin; the extrusion dry material discharging belt conveyor is connected to the dry material buffer belt bin; the extrusion wet material collecting and conveying screw one is connected to the extrusion wet material collecting and conveying screw two;

[0007] The kitchen waste wet material pre-treatment system includes a hydraulic pulp washer, a top pulp outlet control valve, a lower pulp outlet control valve, an industrial water tank, an industrial water control valve, a screen channel, a fine screen, a screw press, a garbage bin one, a sand conveying screw conveyor, a sand-water separator, a shaftless screw conveyor, a garbage bin two, a kitchen waste sand removal tank, a circulating sand discharge pump, a cyclone desander, a stop valve, a gate valve, a reflux valve, a discharge screw pump, a discharge control valve and an anaerobic system; the hydraulic pulp washer is provided with a water inlet, a pulp inlet, a sand discharge port, a top pulp outlet and a lower pulp outlet, the top pulp outlet is located at the top of the hydraulic pulp washer, and the lower pulp outlet is located at the bottom of the hydraulic pulp washer; the second squeezing wet material collection and conveying screw is connected to the pulp inlet; the industrial water tank is connected to the water inlet of the hydraulic pulp washer through the industrial water control valve; the top pulp outlet is connected to the water inlet of the hydraulic pulp washer through the industrial water control valve The top slurry outlet control valve is connected to the grid channel; the lower slurry outlet is connected to the sand-water separator through the lower slurry outlet control valve; the sand outlet of the hydraulic pulp washer is connected to the sand-water separator through the sand conveying screw conveyor; a fine grid is provided in the grid channel, the fine grid is connected to the screw press, and the screw press is connected to the garbage bin one; the outlet at the end of the grid channel is connected to the kitchen waste desanding tank; the overflow port of the sand-water separator is connected to the kitchen waste desanding tank; the sand-water separator is connected to the garbage bin two through the shaftless screw conveyor; the sand outlet of the kitchen waste desanding tank is connected to the circulating sand discharge pump through the stop valve; the circulating sand discharge pump is connected to the cyclone desanding device through the gate valve, and the circulating sand discharge pump is also connected to the slurry inlet of the kitchen waste desanding tank through the reflux valve; the slurry outlet of the kitchen waste desanding tank is connected to the discharge screw pump through the discharge control valve, and the discharge screw pump is connected to the anaerobic system; the water outlet of the cyclone desanding device is connected to the kitchen waste desanding tank, and the sand outlet is connected to the sand-water separator.

[0008] The kitchen waste pre-treatment system of the present invention also includes a waste box, and a manual sorting belt conveyor cooperates with the waste box.

[0009] The present invention provides two top slurry outlets, which are arranged up and down. The top slurry outlet control valves include top slurry outlet control valve 1 and top slurry outlet control valve 2. The two top slurry outlets are connected to the grid channel through top slurry outlet control valve 1 and top slurry outlet control valve 2, respectively.

[0010] The bottom of the hydraulic pulp washer described in the present invention is provided with a vent valve 1.

[0011] The hydraulic pulp washer described in the present invention is also provided with an overflow pipe.

[0012] The bottom of the sand-water separator of the present invention is provided with a second vent valve.

[0013] The shaftless screw conveyor of the present invention is arranged at the bottom of the sand-water separator.

[0014] A method for preprocessing kitchen waste, using the above-mentioned kitchen waste preprocessing device, comprises the following steps:

[0015] The kitchen waste material is loaded by a garbage grab crane onto a chain conveyor and then transported to a bag breaker to puncture the plastic bags of the kitchen waste; the crushed material is transported to a manual sorting belt conveyor, where large inorganic materials are manually sorted out and magnetically separated by a first iron remover. The iron material magnetically separated by the first iron remover is sent to an iron material buffer bin one; the manually sorted material is transported to the extruder through a transfer belt conveyor and an extruder feeding belt conveyor; the extruder squeezes the kitchen waste into dry material and wet material, and the extruded dry material is transported to an extrusion dry material discharging belt conveyor, and after magnetic separation by a second iron remover, it falls into a dry material buffer belt bin; the iron material magnetically separated by the second iron remover is sent to an iron material buffer bin two; the extruded wet material is sent to the pulp inlet of the hydraulic pulp washer through an extrusion wet material collecting and conveying screw one and an extrusion wet material collecting and conveying screw two;

[0016] The industrial water in the industrial water tank is input into the water inlet of the hydraulic pulp washer under the action of the industrial water control valve, and the industrial water and pulp are mixed in the hydraulic pulp washer; the pulp at the top of the hydraulic pulp washer is transported to the screen channel, and the light scum is separated by the fine screen and the screw press and transported to the garbage bin, and the rest of the pulp in the screen channel flows into the kitchen waste sand removal pool; the pulp at the bottom of the hydraulic pulp washer is transported to the sand-water separator for sand-water separation; the sand at the bottom of the hydraulic pulp washer is also transported to the sand-water separator through the sand conveying screw conveyor; the sand in the sand-water separator is precipitated and transported to the garbage bin through the shaftless screw conveyor The remaining slurry overflows into the food waste desanding tank; the sediment at the bottom of the food waste desanding tank is sucked out by the circulating sand discharge pump and sent to the cyclone desanding device for sand and water separation, and the separated slurry is discharged from the sand discharge port at the bottom of the cyclone desanding device to the sand and water separator, and the slurry after desanding flows back to the food waste desanding tank from the water outlet of the cyclone desanding device; the slurry at the bottom of the food waste desanding tank can also be directly transported back to the food waste desanding tank through the circulating sand discharge pump to even the slurry in the food waste desanding tank; the slurry in the food waste desanding tank is transported to the anaerobic system through the discharge control valve and the discharge screw pump.

[0017] Compared with the prior art, the present invention has the following advantages and effects: the process flow of the present invention is reasonably designed, has low energy consumption, high efficiency, can effectively extract organic slurry from kitchen waste and remove impurities such as sand and gravel in the slurry, improve the efficiency of anaerobic fermentation, and extend the life of anaerobic fermentation equipment. Specifically, in the process flow of kitchen waste pretreatment, the kitchen waste bags are broken, and large garbage, glass bottles, metals and other non-degradable materials are removed to ensure the efficient operation of the extruder. Subsequently, the extruder is used to effectively separate the dry and wet materials of the garbage. The dry materials can be sent for incineration and power generation, and the wet materials can be used for anaerobic fermentation to produce biogas and fertilizer. In order to further refine the slurry, the kitchen waste wet material pretreatment system removes heavy impurities and light scum in the slurry through a hydraulic pulp washer, and the slurry of the hydraulic pulp washer is further separated from impurities through a grid and a sand-water separator and then transported to a kitchen waste sand removal tank. The slurry at the bottom of the food waste desanding tank is continuously pumped to the cyclone desanding device for further desanding through the circulating sand discharge pump. The slurry after desanding flows back to the food waste desanding tank, and finally a uniformly mixed organic slurry with low impurity content is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of an embodiment of the present invention DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0020] See also Figure 1 The kitchen waste pretreatment device of the embodiment of the present invention includes a kitchen waste pretreatment system A and a kitchen waste wet material pretreatment system B.

[0021] The kitchen waste pre-treatment system A is used to break the kitchen waste bags and remove large pieces of garbage, metals, glass bottles and other non-degradable materials to ensure the efficient operation of the extruder. The extruder is then used to effectively separate the dry and wet materials of the garbage. The dry materials can be sent for incineration to generate electricity, and the wet materials can be used for anaerobic fermentation to produce biogas and fertilizer.

[0022] The kitchen waste pre-treatment system A includes a garbage grab crane A1, a chain conveyor A2, a bag breaker A3, a manual sorting belt conveyor A4, a waste bin A5, an iron remover A6, an iron material buffer bin A7, a transfer belt conveyor A8, an extruder feeding belt conveyor A9, an extruder A10, an extruded dry material discharging belt conveyor A11, an iron remover II A12, an iron material buffer bin II A13, a dry material buffer belt bin A14, an extruded wet material collecting and conveying screw I A15 and an extruded wet material collecting and conveying screw II A16.

[0023] The garbage grab crane A1 cooperates with the bag breaker A3 through the chain conveyor A2; the bag breaker A3 is connected to the manual sorting belt conveyor A4; an iron remover A6 is arranged above the head roller of the manual sorting belt conveyor A4; the iron remover A6 is connected to the iron material buffer bin A7 through a chute; the manual sorting belt conveyor A4 cooperates with the waste bin A5; the manual sorting belt conveyor A4 is connected to the extruder feeding belt conveyor A9 through the transfer belt conveyor A8; the extruder feeding belt conveyor A9 is connected to the inlet of the extruder A10 Connection; the dry material outlet of the extruder A10 is connected to the extrusion dry material discharge belt conveyor A11, and the wet material outlet is connected to the extrusion wet material collecting and conveying screw A15; an iron remover A12 is arranged above the head roller of the extrusion dry material discharge belt conveyor A11; the iron remover A12 is connected to the iron material buffer bin A13 through a chute; the extrusion dry material discharge belt conveyor A11 is connected to the dry material buffer belt bin A14; the extrusion wet material collecting and conveying screw A15 is connected to the extrusion wet material collecting and conveying screw A16.

[0024] The bag breaker A3 is equipped with two horizontally arranged rollers, on which are wing-shaped blades that pierce the garbage bags, helping to improve the extruder's ability to separate dry and wet materials.

[0025] Extruder A10 can pulp organic matter such as fruits, vegetables, and meat in kitchen waste, and extrude it under high pressure, so that the organic matter forms a wet component that is separated from the kitchen waste, and the remaining material is dehydrated under high pressure to form a dry component.

[0026] The kitchen waste wet material pretreatment system B is used to further refine the slurry and remove solid impurities such as fine sand and plastic pieces in the slurry to obtain an organic slurry that is evenly mixed and low in impurities.

[0027] The kitchen waste wet material pre-treatment system B includes a hydraulic pulp washer B1, a top pulp outlet control valve, a bottom pulp outlet control valve B6, an industrial water tank B2, an industrial water control valve B3, a screen channel B7, a fine screen B8, a screw press B9, a garbage bin B10, a vent valve B11, a sand conveying screw conveyor B12, a sand-water separator B13, a shaftless screw conveyor B27, a garbage bin B14, a vent valve B15, a kitchen waste sand removal tank B16, a circulating sand removal pump B17, a cyclone sand remover B18, a stop valve B19, a gate valve B20, a reflux valve B21, a discharge screw pump, a discharge control valve and an anaerobic system B26. The discharge screw pump includes a discharge screw pump B23 and a discharge screw pump B25, and the discharge control valve includes a discharge control valve B22 and a discharge control valve B24.

[0028] The hydraulic pulp washer B1 is provided with a water inlet, a slurry inlet, a sand outlet, a top slurry outlet and a bottom slurry outlet. The top slurry outlet is located at the top of the hydraulic pulp washer B1, and the bottom slurry outlet is located at the bottom of the hydraulic pulp washer B1; the extruded wet material collection and conveying screw A16 is connected to the slurry inlet; the industrial water tank B2 is connected to the water inlet of the hydraulic pulp washer B1 through the industrial water control valve B3; there are two top slurry outlets, which are arranged up and down, and the top slurry outlet control valves include top slurry outlet control valve 1 B4 and top slurry outlet control valve 2 B5. The two top slurry outlets are connected to the grid channel B7 through the top slurry outlet control valve 1 B4 and the top slurry outlet control valve 2 B5 respectively; the bottom slurry outlet is connected to the sand-water separator B13 through the bottom slurry outlet control valve B6. The sand outlet at the bottom of the hydraulic pulp washer B1 is connected to the sand-water separator B13 through the sand conveying screw conveyor B12. A vent valve B11 is provided at the bottom of the hydraulic pulp washer B1. The hydraulic pulp washer B1 is also provided with an overflow pipe.

[0029] A fine grid B8 is provided in the grid channel B7 for separating light scum, and the fine grid B8 is connected to a screw press B9, and the screw press B9 is connected to a garbage bin B10. The outlet at the end of the grid channel B7 is connected to a kitchen waste desanding pool B16.

[0030] The overflow port of the sand-water separator B13 is connected to the kitchen waste sand removal pool B16; a drain valve B15 is provided at the bottom of the sand-water separator B13. A shaftless screw conveyor B27 is provided at the bottom of the sand-water separator B13, and the shaftless screw conveyor B27 is connected to the garbage bin B14. The sand particles sink into the shaftless screw conveyor B27 due to their own weight and are lifted to the garbage bin by the shaftless screw conveyor B27.

[0031] A sand suction pipe is provided at the bottom of the kitchen waste sand removal pool B16. The sand discharge port of the sand suction pipe is connected to the circulating sand discharge pump B17 through a stop valve B19. The stop valve B19 is used to cut off the pipeline of the slurry inlet when the circulating sand discharge pump B17 is overhauled; the circulating sand discharge pump B17 is connected to the cyclone desander B18 through a gate valve B20. The circulating sand discharge pump B17 is also connected to the slurry inlet of the kitchen waste sand removal pool B16 through a reflux valve B21. The gate valve B20 and the reflux valve B21 are used to realize The outlet slurry of the circulating sand removal pump B17 goes to the cyclone desander B18 or flows back to the food waste desanding tank B16; the slurry outlet of the food waste desanding tank B16 is connected to the discharge screw pump B23 through the discharge control valve B22, and the discharge screw pump B23 is connected to the anaerobic system B26; the slurry outlet of the food waste desanding tank B16 is also connected to the discharge screw pump B25 through the discharge control valve B24, and the discharge screw pump B25 is connected to the anaerobic system B26.

[0032] The water outlet of the cyclone desander B18 is connected to the kitchen waste desander pool B16. The sand outlet of the cyclone desander B18 is connected to the sand-water separator B13. The cyclone desander B18 is based on the principle of centrifugal sedimentation and density difference. When the slurry enters the equipment tangentially from the desander inlet under a certain pressure, it generates a strong rotational motion. Due to the different densities of sand and slurry, the slurry with low density rises and is discharged from the water outlet due to the different forces under the action of centrifugal force, centripetal buoyancy and fluid drag, and the sand with high density is discharged from the bottom sand outlet.

[0033] The hydraulic pulp washer B1 can remove sand and scum from the pulp, improve the efficiency of anaerobic fermentation, and reduce the problem of sand accumulation in the anaerobic reactor.

[0034] A method for preprocessing kitchen waste, using the above-mentioned kitchen waste preprocessing device, comprises the following steps:

[0035] The kitchen waste is unloaded into the kitchen waste storage pit by sanitation vehicles. After the material is loaded into the receiving hopper of the chain conveyor A2 by the garbage grab crane A1, it is transported to the bag breaker A3 to puncture the plastic bags of the kitchen waste, so as to improve the working efficiency of the subsequent extruder. The broken materials are transported to the manual sorting belt conveyor A4, and glass bottles, large objects and other materials that may affect the operation of the extruder are manually sorted out and magnetically separated by the iron remover A6. The manually sorted glass bottles, large objects and other materials fall into the waste bin A5. The iron materials magnetically separated by the iron remover A6 are sent to the iron material buffer bin A7 through the chute. The manually sorted materials are transported to the extruder A10 through the transfer belt conveyor A8 and the extruder feeding belt conveyor A9. The extruder A10 can separate the kitchen waste into dry materials and wet materials by extrusion. The extruded dry materials are transported to the extrusion dry material discharging belt conveyor A11, and after magnetic separation by the iron remover A12, they fall into the dry material buffer belt bin A14, and then are loaded and transported to the incineration plant for incineration and power generation. The iron materials magnetically separated by the iron remover A12 are sent to the iron material buffer bin A13 through the chute; the extruded wet materials are sent to the kitchen waste wet material pre-treatment system B through the extrusion wet material collection and conveying screw A15 and the extrusion wet material collection and conveying screw A16.

[0036] The wet food waste material enters the slurry inlet of the hydraulic pulp washer B1, and at the same time, the industrial water in the industrial water tank B2 is input into the water inlet of the hydraulic pulp washer B1 under the action of the industrial water control valve B3; the industrial water and slurry are stirred and mixed in the hydraulic pulp washer B1; the hydraulic pulp washer B1 controls the discharge of slurry at different liquid levels through the top slurry outlet control valve B4, the top slurry outlet control valve B5 and the bottom slurry outlet control valve B6; the slurry at the top of the hydraulic pulp washer B1 is transported to the grid channel B7, and the light scum is separated by the fine grid B8 and the screw press B9 and transported to the garbage bin B10, and the remaining slurry in the grid channel B7 flows into the food waste desanding pool B16; the slurry at the bottom of the hydraulic pulp washer B1 is transported to the sand-water separator B13 for sand-water separation; the sand at the bottom of the hydraulic pulp washer B1 is also transported to the sand-water separator B13 through the sand conveying screw conveyor B12; the sand and water After the sand in the separator B13 is precipitated, it is sent to the second garbage bin B14 through the shaftless screw conveyor B27, and the remaining slurry overflows to the kitchen waste desanding pool B16; the sediment at the bottom of the kitchen waste desanding pool B16 is sucked out by the circulating sand discharge pump B17 and sent to the cyclone desanding device B18 for sand and water separation. The separated mud and sand are discharged from the sand discharge port at the bottom of the cyclone desanding device B18 to the sand and water separator B13, and the slurry after desanding is discharged from the cyclone desanding device The water outlet of the sand container B18 flows back to the kitchen waste desanding tank B16; the slurry at the bottom of the kitchen waste desanding tank B16 can also be directly transported back to the kitchen waste desanding tank B16 through the circulating sand discharge pump B17, so as to make the slurry in the kitchen waste desanding tank B16 uniform; the slurry in the kitchen waste desanding tank B16 is transported to the anaerobic system B26 through the discharge control valve 1 B22 and the discharge screw pump 1 B23 or the discharge control valve 2 B24 and the discharge screw pump 2 B25.

[0037] The present invention can effectively separate dry materials and wet materials in garbage by breaking bags, manual sorting and squeezing, and can further remove sand and scum in wet materials through hydraulic pulp washer, sand-water separator and cyclone desander, so as to obtain organic slurry with uniform mixing and less impurities, which is convenient for subsequent anaerobic fermentation process and can also reduce problems such as wear of oxidation reactor.

[0038] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A kitchen waste pretreatment device, Features: Including kitchen waste pre-treatment system and kitchen waste wet material pre-treatment system; The kitchen waste pre-treatment system includes a garbage grab crane, a chain conveyor, a bag breaker, a manual sorting belt conveyor, an iron remover 1, an iron material buffer bin 1, a transfer belt conveyor, an extruder feeding belt conveyor, an extruder, an extruded dry material discharging belt conveyor, an iron remover 2, an iron material buffer bin 2, a dry material buffer bin, an extruded wet material collecting and conveying screw 1 and an extruded wet material collecting and conveying screw 2; the garbage grab crane cooperates with the bag breaker through the chain conveyor; the bag breaker is connected to the manual sorting belt conveyor; the manual sorting belt conveyor is provided with an iron remover 1; The first iron remover is connected to the first iron material buffer bin; the manual sorting belt conveyor is connected to the extruder feeding belt conveyor through the transfer belt conveyor; the extruder feeding belt conveyor is connected to the inlet of the extruder; the dry material outlet of the extruder is connected to the extrusion dry material discharging belt conveyor, and the wet material outlet is connected to the extrusion wet material collecting and conveying screw one; the extrusion dry material discharging belt conveyor is provided with the second iron remover; the second iron remover is connected to the second iron material buffer bin; the extrusion dry material discharging belt conveyor is connected to the dry material buffer belt bin; the extrusion wet material collecting and conveying screw one is connected to the extrusion wet material collecting and conveying screw two; The kitchen waste wet material pre-treatment system includes a hydraulic pulp washer, a top pulp outlet control valve, a lower pulp outlet control valve, an industrial water tank, an industrial water control valve, a screen channel, a fine screen, a screw press, a garbage bin one, a sand conveying screw conveyor, a sand-water separator, a shaftless screw conveyor, a garbage bin two, a kitchen waste sand removal tank, a circulating sand discharge pump, a cyclone desander, a stop valve, a gate valve, a reflux valve, a discharge screw pump, a discharge control valve and an anaerobic system; the hydraulic pulp washer is provided with a water inlet, a pulp inlet, a sand discharge port, a top pulp outlet and a lower pulp outlet, the top pulp outlet is located at the top of the hydraulic pulp washer, and the lower pulp outlet is located at the bottom of the hydraulic pulp washer; the second squeezing wet material collection and conveying screw is connected to the pulp inlet; the industrial water tank is connected to the water inlet of the hydraulic pulp washer through the industrial water control valve; the top pulp outlet is connected to the water inlet of the hydraulic pulp washer through the industrial water control valve The top slurry outlet control valve is connected to the grid channel; the lower slurry outlet is connected to the sand-water separator through the lower slurry outlet control valve; the sand outlet of the hydraulic pulp washer is connected to the sand-water separator through the sand conveying screw conveyor; a fine grid is provided in the grid channel, the fine grid is connected to the screw press, and the screw press is connected to the garbage bin one; the outlet at the end of the grid channel is connected to the kitchen waste desanding tank; the overflow port of the sand-water separator is connected to the kitchen waste desanding tank; the sand-water separator is connected to the garbage bin two through the shaftless screw conveyor; the sand outlet of the kitchen waste desanding tank is connected to the circulating sand discharge pump through the stop valve; the circulating sand discharge pump is connected to the cyclone desanding device through the gate valve, and the circulating sand discharge pump is also connected to the slurry inlet of the kitchen waste desanding tank through the reflux valve; the slurry outlet of the kitchen waste desanding tank is connected to the discharge screw pump through the discharge control valve, and the discharge screw pump is connected to the anaerobic system; the water outlet of the cyclone desanding device is connected to the kitchen waste desanding tank, and the sand outlet is connected to the sand-water separator.

2. The kitchen waste pretreatment device according to claim 1, Features: The kitchen waste pre-treatment system also includes a waste box, and a manual sorting belt conveyor cooperates with the waste box.

3. The kitchen waste pretreatment device according to claim 1, Features: There are two top slurry outlets, which are arranged up and down. The top slurry outlet control valves include top slurry outlet control valve 1 and top slurry outlet control valve 2. The two top slurry outlets are connected to the grid channel through top slurry outlet control valve 1 and top slurry outlet control valve 2 respectively.

4. The kitchen waste pretreatment device according to claim 1, Features: A vent valve is provided at the bottom of the hydraulic pulp washer.

5. The kitchen waste pretreatment device according to claim 1, Features: The hydraulic pulp washer is also provided with an overflow pipe.

6. The kitchen waste pretreatment device according to claim 1, Features: A second vent valve is provided at the bottom of the sand-water separator.

7. The kitchen waste pretreatment device according to claim 1, Features: The shaftless screw conveyor is arranged at the bottom of the sand-water separator.

8. A method for pre-processing kitchen waste, Features: The method is carried out using the kitchen waste pretreatment device according to any one of claims 1 to 7, comprising the following steps: The kitchen waste material is loaded by the garbage grab crane onto the chain conveyor and then transported to the bag breaker to puncture the plastic bags of the kitchen waste; the crushed material is transported to the manual sorting belt conveyor for manual sorting and magnetic separation by the iron remover 1, and the iron material magnetically separated by the iron remover 1 is sent to the iron material buffer bin 1; the manually sorted material is transported to the extruder through the transfer belt conveyor and the extruder feeding belt conveyor; the extruder squeezes the kitchen waste into dry material and wet material, and the extruded dry material is transported to the extrusion dry material discharging belt conveyor, and after magnetic separation by the iron remover 2, it falls into the dry material buffer belt bin; the iron material magnetically separated by the iron remover 2 is sent to the iron material buffer bin 2; the extruded wet material is sent to the pulp inlet of the hydraulic pulp washer through the extrusion wet material collection and conveying screw 1 and the extrusion wet material collection and conveying screw 2; The industrial water in the industrial water tank is input into the water inlet of the hydraulic pulp washer under the action of the industrial water control valve, and the industrial water and pulp are mixed in the hydraulic pulp washer; the pulp at the top of the hydraulic pulp washer is transported to the screen channel, and the light scum is separated by the fine screen and the screw press and then transported to the garbage bin 1, and the rest of the pulp in the screen channel flows into the kitchen waste sand removal pool; the pulp at the bottom of the hydraulic pulp washer is transported to the sand-water separator for sand-water separation; the sand at the bottom of the hydraulic pulp washer is also transported to the sand-water separator through the sand conveying screw conveyor; the sand sediment in the sand-water separator is transported to the Garbage bin two, the remaining slurry overflows into the food waste desanding tank; the sediment at the bottom of the food waste desanding tank is sucked out by the circulating sand discharge pump and sent to the cyclone desanding device for sand and water separation, and the separated mud and sand are discharged from the sand discharge port at the bottom of the cyclone desanding device to the sand-water separator, and the slurry after desanding flows back to the food waste desanding tank from the water outlet of the cyclone desanding device; the slurry at the bottom of the food waste desanding tank is directly transported back to the food waste desanding tank through the circulating sand discharge pump to even the slurry in the food waste desanding tank; the slurry in the food waste desanding tank is transported to the anaerobic system through the discharge control valve and the discharge screw pump.

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