Pretreatment device and kitchen waste treatment system

Abstract

The utility model discloses a pretreatment device and a kitchen waste treatment system. The pretreatment device comprises an impurity removal unit, an adjusting unit and a sand discharge unit, the impurity removal unit is provided with an impurity removal inlet end and an impurity removal outlet end and is used for removing settled sand; the adjusting unit is provided with an adjusting cavity, and the adjusting cavity is communicated with the impurity removal outlet end and is provided with a discharge hole communicated with the anaerobic device; the sand discharging unit comprises a stirring structure, an output pipe and a pump body, the stirring structure is arranged on the adjusting unit and located at the bottom of the adjusting cavity, the liquid outlet end of the output pipe communicates with the impurity removal inlet end, the liquid inlet end of the output pipe communicates with the bottom of the adjusting cavity, and the pump body is arranged on the output pipe. According to the pretreatment device in the scheme, non-stop cleaning of accumulated materials at the bottom of the adjusting unit can be achieved, the treatment efficiency of kitchen waste is improved, recycling of the cleaned materials is achieved, and therefore the recycling rate of the kitchen waste is increased.

Description

Technical Field

[0001] This utility model relates to the field of food waste treatment technology, specifically to a pretreatment device and a food waste treatment system. Background Technology

[0002] Currently, most food waste treatment processes involve pretreatment first. The pretreated materials, after sorting, removing impurities, heating to remove oil and sand, are then sent to an equalization tank. After the water quality and quantity are balanced in the equalization tank, the waste is transported to an anaerobic fermentation unit, where it ferments to produce biogas.

[0003] CN220351938U discloses an anaerobic treatment device for kitchen waste, which connects a three-phase separator, an equalization tank, an anaerobic digestion reactor, and a biogas slurry storage tank in sequence. The kitchen waste is first transported to the three-phase separator, where solid phases such as sediment and grease are removed. The separated slurry is then transported to the equalization tank and the anaerobic digestion reactor in sequence, where it is decomposed into biogas and stored in the biogas slurry storage tank.

[0004] However, during prolonged operation, fine sand and stored materials accumulate at the bottom of the equalization tank, leading to scaling and a gradual reduction in its volume, potentially even clogging the output pipes. Currently, periodic shutdowns of the equalization tank and the introduction of external water to flush away the sediment and accumulated materials at the bottom, followed by the transfer of the cleaned material to a three-phase separator for recycling, reduce the efficiency of food waste treatment. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a pretreatment device to solve the technical problem in the prior art that the treatment efficiency of kitchen waste is reduced by periodically stopping the operation of the equalization tank and introducing an external water source to wash and clean the sediment and accumulated materials at the bottom of the equalization tank, and then sending the cleaned materials to a three-phase separator for recycling.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, this utility model provides a pretreatment device, comprising:

[0008] The impurity removal unit has an impurity removal inlet and an impurity removal outlet, and is used to remove sediment.

[0009] The regulating unit has a regulating cavity connected to the impurity removal outlet end and is provided with an outlet for connecting to the anaerobic device; and

[0010] The sand removal unit includes a stirring structure, an output pipe, and a pump body. The stirring structure is located in the regulating unit and at the bottom of the regulating cavity. The liquid outlet of the output pipe is connected to the impurity removal inlet, and its liquid inlet is connected to the bottom of the regulating cavity. The pump body is located in the output pipe.

[0011] In some embodiments, the sand discharge unit further includes an output valve, which is disposed on the output pipe and located on the side of the pump body away from the regulating chamber;

[0012] The stirring structure includes a circulation pipe that connects to the output pipe, and the connection point between the circulation pipe and the output pipe is located between the pump body and the output valve, and its internal channel also connects to the bottom of the regulating chamber.

[0013] In some embodiments, the stirring structure further includes a plurality of stirring tubes, the circulation tube is connected to the plurality of stirring tubes respectively, and is connected to the bottom of the regulating cavity via the plurality of stirring tubes, the communication ports of the plurality of stirring tubes and the inner wall of the regulating cavity are arranged at intervals along the circumference of the regulating cavity.

[0014] In some embodiments, the adjustment cavity is cylindrical, and the tangent at the connection between its inner wall and each of the stirring tubes is an indicator tangent.

[0015] The stirring tube has a stirring section extending into the regulating cavity. Each stirring section is set at an angle to the adjacent indicator tangent, and multiple stirring sections are arranged sequentially along the circumference of the regulating cavity.

[0016] In some embodiments, the stirring structure further includes a circulation valve disposed in the circulation pipe.

[0017] In some embodiments, the pretreatment device further includes an oil drain pipe and an oil drain valve, wherein the internal channel of the oil drain pipe connects the impurity removal inlet end with the upper part of the regulating chamber, and the oil drain valve is disposed on the oil drain pipe.

[0018] In some embodiments, the upper part of the inner wall of the regulating cavity has an oil outlet for communication with the oil drain pipe, and the inner wall of the regulating cavity is also provided with an inclined skimming groove, the lower end of which is connected to the oil outlet.

[0019] In some embodiments, the bottom wall of the adjustment cavity is inclined downward from the periphery to the middle;

[0020] The connection between the internal channel of the output tube and the regulating cavity is located at the bottom center of the regulating cavity.

[0021] In some embodiments, the output tube has a sand discharge section extending into the regulating cavity, the sand discharge section extending from the side wall of the regulating cavity to the middle and spaced apart from the bottom wall of the regulating cavity.

[0022] In some embodiments, the discharge port is located at the bottom of the regulating cavity;

[0023] The pretreatment device also includes an input pipe, the internal channel of which is connected to the impurity removal outlet end, and one end of which extends into the interior of the adjustment cavity and is located at the top of the adjustment cavity, and has a downwardly inclined bent section.

[0024] Secondly, this utility model also provides a kitchen waste treatment system, which includes the pretreatment device described in any of the above-mentioned items.

[0025] Compared with existing technologies, the pretreatment device provided by this utility model, during normal system operation, the impurity removal unit transports the slurry after sand and grease removal to the regulating chamber of the regulating unit, and after the regulating unit balances the water quality and quantity, it is transported to the anaerobic device. During this process, the stirring structure continuously agitates the material at the bottom of the regulating unit, preventing scaling. After the regulating unit has been running for a certain period, the material at its bottom accumulates to a preset amount, and then the material is pumped through the pump body to the impurity removal unit via the output pipe. The impurity removal unit then removes sediment and unusable materials again, and the separated slurry is returned to the regulating unit for reuse.

[0026] Thus, the pretreatment device in this solution can clean the accumulated material at the bottom of the adjustment unit without stopping production, improve the treatment efficiency of kitchen waste, and realize the recycling of the cleaned material, thereby improving the recycling rate of kitchen waste. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the pretreatment device provided in an embodiment of the present utility model;

[0028] Figure 2 yes Figure 1 A partial schematic diagram of the pretreatment unit;

[0029] Figure 3 yes Figure 1 Top view of the pretreatment unit (showing the sand removal unit section);

[0030] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0031] Figure 5 yes Figure 1 A partial schematic diagram of the pretreatment device.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Adjustment unit; 1a. Adjustment chamber; 1b. Discharge port; 1c. Skimming trough; 11. Indicating tangent; 2. Sand discharge unit; 21. Stirring structure; 211. Circulation pipe; 212. Stirring pipe; 2121. Stirring section; 213. Circulation valve; 22. Output pipe; 221. Sand discharge section; 23. Pump body; 24. Output valve; 3. Oil discharge pipe; 4. Oil discharge valve; 5. Input pipe; 51. Bend section; 52. Extension section. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0035] To address the technical problem in existing technologies where periodic shutdowns of the equalization tank are used to flush and clean the sediment and accumulated materials at the bottom of the tank with external water, followed by the transfer of the cleaned materials to a three-phase separator for recycling, thus reducing the efficiency of food waste treatment, this invention provides a pretreatment device that enables continuous cleaning of the accumulated materials at the bottom of the equalization unit, improving the efficiency of food waste treatment and enabling the recycling of the cleaned materials, thereby increasing the recycling rate of food waste.

[0036] It should be noted that the pretreatment device described in this utility model is used in, but not limited to, food waste treatment systems. For ease of explanation, this utility model only uses the application of the pretreatment device in a food waste treatment system as an example. The principle of the pretreatment device in other types of equipment is essentially the same as that in the food waste treatment system, and will not be described in detail here.

[0037] Please see Figures 1 to 3 , Figures 1 to 3 This is a schematic diagram of the pretreatment device in one embodiment of the present invention. The pretreatment device includes a purification unit, an adjustment unit 1, and a sand discharge unit 2. The purification unit has a purification inlet end and a purification outlet end for removing sediment. The adjustment unit 1 has an adjustment cavity 1a, which is connected to the purification outlet end and is provided with an outlet 1b for connecting to the anaerobic device. The sand discharge unit 2 includes a stirring structure 21, an output pipe 22, and a pump body 23. The stirring structure 21 is located in the adjustment unit 1 and at the bottom of the adjustment cavity 1a for agitating the material at the bottom of the adjustment cavity 1a. The liquid outlet end of the output pipe 22 is connected to the purification inlet end, and its liquid inlet end is connected to the bottom of the adjustment cavity 1a. The pump body 23 is located in the output pipe 22.

[0038] In the pretreatment device provided by this utility model, during normal system operation, the impurity removal unit transports the slurry after sand and grease removal to the regulating chamber 1a of the regulating unit 1, and after the water quality and quantity are balanced by the regulating unit 1, it is transported to the anaerobic device. During this process, the material at the bottom of the regulating unit 1 can be continuously disturbed by the stirring structure 21 to prevent scaling. After the regulating unit 1 has been running for a certain period of time, the material at the bottom of the regulating unit 1 accumulates to a preset amount, and then the material at the bottom of the regulating unit 1 is pumped to the impurity removal unit through the output pipe 22 by the pump body 23, so that the impurity removal unit can remove the sediment and unusable material again, and the separated slurry is transported back to the regulating unit 1 for reuse.

[0039] Thus, the pretreatment device in this solution can clean the accumulated material at the bottom of the adjustment unit 1 without stopping, improve the treatment efficiency of kitchen waste, and realize the recycling of the cleaned material, thereby improving the recycling rate of kitchen waste.

[0040] It should be noted that the impurity removal unit can be configured as a combination of a grit chamber and an oil removal chamber, a combination of a grit removal filter and an oil removal filter, or a three-phase processor; no limitation is imposed here. Furthermore, the regulating unit 1 can be configured as a regulating tank, regulating vessel, or regulating vessel. Additionally, the inlet end of the outlet pipe 22 introduces the material inside the regulating chamber 1a into it, and the material is returned to the impurity removal inlet end of the impurity removal unit via its outlet end.

[0041] Specifically, in this solution, the impurity removal unit is configured as a three-phase processor to achieve thorough impurity, oil, and sand removal, and to fully separate the solid and liquid phases; in addition, the regulating unit 1 is configured as a regulating tank. It should be understood that the specific structure and principle of the three-phase processor are existing technologies and are not limited herein.

[0042] In one embodiment, the sand discharge unit 2 further includes an output valve 24, which is located on the output pipe 22 and on the side of the pump body 23 away from the regulating chamber 1a; the stirring structure 21 includes a circulation pipe 211, which is connected to the output pipe 22, and the connection between the circulation pipe 21 and the output pipe 22 is located between the pump body 23 and the output valve 24, and its internal channel is also connected to the bottom of the regulating chamber 1a.

[0043] In this embodiment, the stirring structure 21 is configured as a circulation pipe 211. When the accumulated material at the bottom of the regulating unit 1 is not being cleaned, the output valve 24 on the output pipe 22 is closed, preventing material from flowing back to the impurity removal unit via the output pipe 22. Instead, the material returns to the bottom of the regulating unit 1 via the circulation pipe 211, disturbing the material at the bottom of the regulating unit 1 and preventing scaling. Thus, while disturbing the material at the bottom of the regulating unit 1, an external water source is not required, avoiding disruption of the balance within the regulating unit 1. The structure is simple and reliable. Furthermore, when it is necessary to remove the material from the bottom of the regulating unit 1, the output valve 24 only needs to be opened periodically.

[0044] In one embodiment, please refer to Figure 3 and Figure 4 The stirring structure 21 also includes multiple stirring tubes 212. The circulation tube 211 is connected to the multiple stirring tubes 212 respectively, and is connected to the bottom of the regulating cavity 1a through the multiple stirring tubes 212. The multiple stirring tubes 212 and the communication ports of the inner wall of the regulating cavity 1a are arranged at intervals along the circumference of the regulating cavity 1a.

[0045] In this embodiment, multiple stirring tubes 212 are arranged at intervals along the circumference of the regulating unit 1, and the multiple stirring tubes 212 are respectively inserted into the regulating cavity 1a to improve the stirring capacity and uniformity of the material at the bottom of the regulating unit 1. It should be noted that the number of stirring tubes 212 can be two, three, four, or other numbers greater than two, and is not limited here. Specifically, in this solution, two stirring tubes 212 are provided, and the two stirring tubes 212 are located on opposite sides of the regulating cavity 1a.

[0046] In one embodiment, the regulating cavity 1a is cylindrical, and the tangent at the connection between its inner wall and each stirring tube 212 is an indicator tangent 11; the stirring tube 212 has a stirring section 2121 extending into the regulating cavity 1a, each stirring section 2121 is set at an angle with the adjacent indicator tangent 11, and multiple stirring sections 2121 are arranged sequentially along the circumference of the regulating cavity 1a.

[0047] In this embodiment, the stirring section 2121 and the indicator tangent 11 are set at an angle, so that the circulating water flow input from the stirring section 2121 can disturb the material at the bottom of the regulating unit 1 as much as possible. Specifically, in this solution, the stirring section 2121 and the indicator tangent 11 are set at a 30° angle, which allows the water flow circulating into the regulating unit 1 to form a vortex, while also allowing the circulating water flow from multiple stirring sections 2121 to cover all parts of the bottom of the regulating unit 1, effectively preventing scale buildup at the bottom of the regulating unit 1.

[0048] It should be noted that in this scheme, the multiple stirring sections 2121 are arranged sequentially along the circumference of the regulating cavity 1a, meaning that the orientation of the multiple stirring sections 2121 is simultaneously in a clockwise or counterclockwise direction. Specifically, in the example in the attached drawing, the multiple stirring sections 2121 are arranged simultaneously in a counterclockwise direction.

[0049] In one embodiment, the stirring structure 21 further includes a circulation valve 213, which is disposed in the circulation pipe 211.

[0050] In this embodiment, a circulation valve 213 is also provided on the circulation pipe 211, so that the opening of the circulation valve 213 can be flexibly adjusted according to the working time, thereby flexibly adjusting the disturbance capability at the bottom of the regulating unit 1. It should be noted that in this solution, both the circulation valve 213 and the output valve 24 are set as solenoid valves.

[0051] In one embodiment, the pretreatment device further includes an oil drain pipe 3 and an oil drain valve 4. The internal channel of the oil drain pipe 3 connects the impurity removal inlet end with the upper part of the regulating chamber 1a, and the oil drain valve 4 is located at the oil drain.

[0052] In this embodiment, an oil drain pipe 3 is also provided on the regulating unit 1 to periodically drain the floating oil accumulated at the top of the regulating tank. Specifically, in this design, the connection point between the oil drain pipe 3 and the regulating unit 1 is set at 2 / 3 of the height of the regulating unit 1, which is usually the floating oil level. Furthermore, it should be noted that the oil drain pipe 3 can be connected separately to the impurity removal inlet of the impurity removal unit, or it can be connected to the impurity removal inlet via the output pipe 22. To improve the flexibility of oil draining, in one embodiment, the oil drain pipe 3 is connected separately to the impurity removal inlet.

[0053] In one embodiment, the upper part of the inner wall of the regulating cavity 1a has an oil outlet for the oil drain pipe 3 to connect to, and the inner wall of the regulating cavity 1a is also provided with an inclined skimming groove 1c, the lower end of which is connected to the oil outlet.

[0054] In this embodiment, a skimming trough 1c is also provided on the inner wall of the regulating cavity 1a to guide the floating oil and scum out of the oil drain pipe 3. Specifically, based on the above embodiment where the multiple stirring sections 2121 are arranged in a counterclockwise direction, in this solution, the skimming trough 1c is also inclined downward in a counterclockwise direction to further facilitate the discharge of scum and floating oil along the skimming trough 1c.

[0055] In one embodiment, the bottom wall of the regulating cavity 1a is inclined downward from the periphery to the middle; the connection between the internal channel of the output pipe 22 and the regulating cavity 1a is located at the bottom middle of the regulating cavity 1a.

[0056] In this embodiment, the bottom of the regulating cavity 1a is also set to be tapered downwards, so that the material and sediment at the bottom of the regulating unit 1 can be relatively concentrated at the bottom of the regulating cavity 1a, thereby facilitating the material at the bottom of the regulating unit 1 to be transported to the impurity removal unit via the output pipe 22, and improving the material discharge efficiency.

[0057] In one embodiment, the output pipe 22 has a sand discharge section 221 extending into the regulating cavity 1a. The sand discharge section 221 extends from the side wall of the regulating cavity 1a to the middle and is spaced apart from the bottom wall of the regulating cavity 1a.

[0058] In this embodiment, the sand discharge section 221 is configured such that the material collected in the middle of the bottom of the regulating chamber 1a is discharged through the sand discharge section 221, while also preventing the material from being driven by its own weight to collect at the inlet end of the sand discharge section 221 and causing blockage. This ensures that the material enters the sand discharge section 221 with a certain kinetic energy only under the disturbance of water flow, thus avoiding blockage of the sand discharge pipe.

[0059] In one embodiment, please refer to Figure 1 and Figure 5 The discharge port 1b is located at the bottom of the regulating cavity 1a; the pretreatment device also includes an input pipe 5, the internal channel of the input pipe 5 is connected to the impurity removal outlet end, and one end extends into the interior of the regulating cavity 1a and is located at the top of the regulating cavity 1a, and has a downwardly inclined bent section 51.

[0060] In this embodiment, the bent section 51 is inclined toward the floating oil, so that the material entering the regulating chamber 1a can directly impact the floating oil, which is convenient to break the possible scum layer and enter the regulating chamber 1a. During the material settling process, the oil automatically gathers upward and the heavy material sinks. After being homogenized by the bottom hydraulic stirring, it enters the anaerobic device through the discharge port 1b.

[0061] Specifically, in this scheme, the input pipe 5 also has an extension section 52, which is horizontally arranged and parallel to the floating oil at 180°. The bending section 51 connects to the extension section 52 and is set at a 45° angle with the extension section 52.

[0062] Furthermore, this utility model also provides a food waste treatment system, which includes the pretreatment device described above. It should be noted that the detailed structure of the pretreatment device in the food waste treatment system can be found in the embodiments described above, and will not be repeated here. Since the pretreatment device described above is used in the food waste treatment system of this utility model, the embodiments of the food waste treatment system of this utility model include all the technical solutions of all the embodiments of the pretreatment device described above, and the achieved technical effects are completely the same, and will not be repeated here.

[0063] To better understand this utility model, the following is combined with... Figures 1 to 5 The technical solution of this utility model is described in detail below:

[0064] In this embodiment, the material from the impurity removal unit is fed from a high position through the input pipe 5, and enters the regulating chamber 1a of the regulating unit 1 through the extension section 52 and the bending section 51. Since the bending section 51 is set downward at 45°, the material can impact and destroy any scum layer that may form in the regulating chamber 1a. During the material settling process, the oil automatically gathers upward, while the heavy matter sinks. After being homogenized by the bottom hydraulic stirring, the material enters the anaerobic device.

[0065] The sand discharge section 221 at the bottom of the regulating chamber 1a serves as the inlet side of the pump body 23, the circulation pipe 211 serves as the circulation outlet side of the pump body 23, and the end of the output pipe 22 connected to the impurity removal unit serves as the return outlet side of the pump body 23. Thus, hydraulic circulation can be achieved at the bottom of the regulating unit 1 via the circulation pipe 211, and the circulation valve 213 can be kept open for continuous circulation. When it is necessary to discharge material from the bottom of the regulating unit 1, the output valve 24 can be opened according to specified requirements to discharge the bottom material to the impurity removal unit. Furthermore, by switching valves, the oil-rich material at the top of the regulating unit 1 can be discharged to the impurity removal unit via the oil discharge pipe 3.

[0066] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A pretreatment apparatus, characterized in that, include: The impurity removal unit has an impurity removal inlet and an impurity removal outlet, and is used to remove sediment. The regulating unit has an regulating cavity, which is connected to the impurity removal outlet end and is provided with an outlet for connecting to the anaerobic device; and The sand removal unit includes a stirring structure, an output pipe, and a pump body. The stirring structure is located in the regulating unit and at the bottom of the regulating cavity. The liquid outlet of the output pipe is connected to the impurity removal inlet, and its liquid inlet is connected to the bottom of the regulating cavity. The pump body is located in the output pipe.

2. The pretreatment apparatus according to claim 1, characterized in that, The sand discharge unit also includes an output valve, which is located on the output pipe and on the side of the pump body away from the regulating chamber. The stirring structure includes a circulation pipe that connects to the output pipe, and the connection point between the circulation pipe and the output pipe is located between the pump body and the output valve, and its internal channel also connects to the bottom of the regulating chamber.

3. The pretreatment apparatus according to claim 2, characterized in that, The stirring structure also includes multiple stirring tubes, and the circulation pipe is connected to the multiple stirring tubes respectively, and is connected to the bottom of the regulating cavity through the multiple stirring tubes. The communication ports between the multiple stirring tubes and the inner wall of the regulating cavity are arranged at intervals along the circumference of the regulating cavity.

4. The pretreatment apparatus according to claim 3, characterized in that, The regulating cavity is cylindrical, and the tangent at the connection between its inner wall and each of the stirring tubes is the indicator tangent. The stirring tube has a stirring section extending into the regulating cavity. Each stirring section is arranged at an angle to the adjacent indicator tangent, and multiple stirring sections are arranged sequentially along the circumference of the regulating cavity.

5. The pretreatment apparatus according to claim 2, characterized in that, The stirring structure also includes a circulation valve, which is located in the circulation pipe.

6. The pretreatment apparatus according to any one of claims 1 to 5, characterized in that, The pretreatment device also includes an oil drain pipe and an oil drain valve. The internal channel of the oil drain pipe connects the impurity removal inlet end with the upper part of the regulating chamber, and the oil drain valve is located on the oil drain pipe.

7. The pretreatment apparatus according to claim 6, characterized in that, The upper part of the inner wall of the regulating cavity has an oil outlet for the oil drain pipe to connect to, and the inner wall of the regulating cavity is also provided with an inclined skimming groove, the lower end of which is connected to the oil outlet.

8. The pretreatment apparatus according to claim 1, characterized in that, The bottom wall of the adjustment cavity is inclined downward from the periphery to the middle; The connection between the internal channel of the output tube and the regulating cavity is located at the bottom center of the regulating cavity.

9. The pretreatment apparatus according to claim 8, characterized in that, The output pipe has a sand discharge section that extends into the regulating cavity. The sand discharge section extends from the side wall of the regulating cavity to the middle and is spaced apart from the bottom wall of the regulating cavity.

10. A food waste treatment system, characterized in that, Includes the pretreatment apparatus as described in any one of claims 1-9.

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