Kitchen crude oil dehydration and impurity removal system

Abstract

The invention relates to the technical field of grease purification, and provides a kitchen crude grease dehydration and impurity removal system which comprises a grease buffer tank used for receiving and storing a crude grease incoming material; the plurality of heating kettles are arranged in parallel and are used for heating, stirring and settling separation treatment of the crude oil; the conveying pump is connected between the grease buffer tank and the heating kettle and is used for conveying the crude grease from the buffer tank to the heating kettle; the purified oil collecting pipeline is connected with the purified oil outlets of the heating kettles and is used for collecting the purified oil treated by the heating kettles; and the control system is electrically connected with the heating kettle and the conveying pump. By adopting the design of temporary storage and homogenization of the oil buffer tank, heating settling separation of the heating kettle and subsequent clean oil collection, automatic continuous treatment of kitchen crude oil, water and slag separation can be realized, the treatment effect of dehydration and impurity removal and the water and slag separation efficiency are improved, and the problem of high content of kitchen crude oil, water and slag is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of oil purification technology, and in particular to a system for dehydrating and removing impurities from crude kitchen oil. Background Technology

[0002] Food waste can be processed to extract crude oil, which is an important raw material for the production of biodiesel and industrial greases. However, the crude oil initially separated from food waste usually contains a high proportion of water and solid impurities (water residue), typically ranging from 3% to 10% or even higher. This high water and impurity content not only reduces the economic value of the crude oil but also creates difficulties in subsequent refining or chemical applications, such as increased energy consumption, equipment corrosion, and reduced catalyst activity. Therefore, before selling crude oil as a qualified raw material or undergoing further processing, it must undergo effective dehydration and impurity removal pretreatment to stably reduce its water and impurity content to a low level, thereby improving its quality and economic value.

[0003] Current methods for dehydrating and removing impurities from crude kitchen grease mostly employ a single-tank heating and settling process, or combine it with a simple conveying and collection pipeline to form a processing system. This type of processing method generally has the following technical defects: single-tank processing is a batch operation, which cannot achieve continuous production; the crude grease processing efficiency is low and the effect is poor, which easily leads to the accumulation of incoming materials; and the automation level of the entire processing system is low, relying heavily on manual operation to control the start and stop of each process and parameter adjustment, resulting in unstable processing effect. Summary of the Invention

[0004] This invention provides a system for dehydrating and removing impurities from crude kitchen grease, which solves the problems of poor water and sludge removal and low automation in the existing technology for dehydrating and removing impurities from crude kitchen grease.

[0005] This invention provides a system for dehydrating and removing impurities from crude kitchen grease, comprising: Grease buffer tank, used to receive and store crude grease; Multiple heating vessels, arranged in parallel, are used for heating, stirring, and sedimentation separation of crude oil; A delivery pump, connected between the grease buffer tank and the heating vessel, is used to deliver crude grease from the grease buffer tank to the heating vessel; The clean oil collection pipeline is connected to the clean oil outlet of each of the heating kettles and is used to collect the clean oil after it has been treated by the heating kettles; The control system is electrically connected to the heating vessel and the delivery pump.

[0006] According to the kitchen grease dehydration and impurity removal system provided by the present invention, the grease buffer tank is equipped with a level gauge and a temperature sensor, both of which are electrically connected to the control system.

[0007] According to the kitchen crude oil dehydration and impurity removal system provided by the present invention, the delivery pump is a variable frequency pump, and the control system is configured to adjust the speed of the delivery pump according to the liquid level signal of the oil buffer tank so as to stably supply material to the heating kettle (2).

[0008] According to the kitchen crude oil dehydration and impurity removal system provided by the present invention, the heating vessel is a steam heating vessel, and the heating vessel is provided with a jacketed inner coil steam heating structure and a stirrer.

[0009] According to the kitchen crude oil dehydration and impurity removal system provided by the present invention, the heating vessel is equipped with a stirrer, the stirrer is a frame stirrer, and the stirring paddle of the stirrer is provided with a wall scraping structure.

[0010] The dehydration and impurity removal system for crude kitchen grease provided by the present invention further includes a water and impurity treatment unit, which includes a collection tank and a screw conveyor. The collection tank is located below the drain outlet of the heating kettle, and the screw conveyor is connected to the collection tank for conveying water sludge material.

[0011] The dehydration and impurity removal system for crude kitchen grease provided by the present invention further includes a steam pipeline, which includes a first main pipeline and a plurality of first branch pipelines. The first main pipeline is provided with a pressure reducing valve, and the first branch pipelines are connected between the heating vessel and the first main pipeline. Each first branch pipeline of the heating vessel is provided with an electric regulating valve, and the electric regulating valve is electrically connected to the control system.

[0012] The kitchen grease dehydration and impurity removal system provided by the present invention further includes a condensate recovery pipeline, which is connected to the condensate outlet of each of the heating kettles and is used to collect the condensate from each of the heating kettles and send it to the rinsing water tank.

[0013] The kitchen grease dehydration and impurity removal system provided by the present invention further includes a clean oil collection pipeline, which includes a second main pipeline and a plurality of second branch pipelines. The two ends of the second branch pipelines are respectively connected to the oil outlet of the heating kettle and the first main pipeline. The second main pipeline is connected to a grease storage tank. Each second branch pipeline is equipped with an electric gate valve, which is electrically connected to the control system.

[0014] According to the kitchen crude oil dehydration and impurity removal system provided by the present invention, the drain port of the heating kettle is connected to a drain electric valve, the drain electric valve is electrically connected to the control system, and the control system is used to control the drain electric valve to drain impurities in an intermittent mode, including opening for a first preset time and then closing, and closing for a second preset time and then opening, wherein the first preset time is less than the second preset time.

[0015] This invention provides a system for dehydrating and removing impurities from crude kitchen oil, comprising an oil buffer tank, multiple heating kettles, a delivery pump, a clean oil collection pipeline, and a control system. By employing a design that utilizes a buffer tank for temporary homogenization, heating and sedimentation separation in the heating kettles, and subsequent clean oil collection, this invention enables automated and continuous processing of water and sludge separation in crude kitchen oil. This improves the dehydration and impurity removal effect and water-sludge separation efficiency, effectively solving the problem of high water and sludge content in crude kitchen oil. It can stably reduce the water and sludge content in crude oil from 3-10% to below 1.5%, improving the quality of kitchen bio-oil and meeting the raw material requirements for subsequent refining processing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a front view of a kitchen oil dehydration and impurity removal system provided in an embodiment of the present invention.

[0018] Figure 2 This is a top view of a kitchen oil dehydration and impurity removal system provided in an embodiment of the present invention.

[0019] Figure label: 1. Grease buffer tank; 2. Heating vessel; 3. Transfer pump; 4. Screw conveyor; 5. First main line; 6. First branch line; 7. Second main line; 8. Second branch line; 9. Condensate recovery pipeline; 10. Electric regulating valve; 11. Electric gate valve. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] The following is combined Figures 1 to 2 This invention describes a system for dehydrating and removing impurities from crude grease in kitchens.

[0022] This embodiment provides a system for dehydrating and removing impurities from crude kitchen grease, comprising: a grease buffer tank 1, multiple heating kettles 2, a delivery pump 3, a clean oil collection pipeline, and a control system.

[0023] Among them, the grease buffer tank 1 is used to receive and store crude grease. Specifically, the grease buffer tank 1 is used to receive and temporarily store uneven crude grease, so as to provide a stable and continuous supply for subsequent heating kettle 2 processing, avoid interruption of processing due to fluctuation of incoming material, ensure the overall system operation stability, and at the same time, it can also achieve preliminary static stratification of crude grease, so as to achieve subsequent dehydration and impurity removal pretreatment.

[0024] Multiple heating kettles are connected in parallel to heat, stir, and separate crude oil. By arranging multiple heating vessels 2 in parallel, a batch cycle mode can be achieved where some heating vessels 2 are in operation, some are on standby, and some are used for feeding or settling. This avoids the entire system from shutting down due to the failure of a single heating vessel 2, enabling continuous crude oil processing and improving overall processing efficiency.

[0025] The transfer pump 3 is connected between the grease buffer tank 1 and the heating vessel 2 to transfer crude grease from the buffer tank to the heating vessel 2. By placing the transfer pump 3 between the grease buffer tank 1 and the heating vessel 2, the directional and stable transfer of crude grease can be achieved, ensuring the stable operation of the system.

[0026] The clean oil collection pipeline is connected to the clean oil outlet of each heating vessel 2 to collect the clean oil after it has been treated by the heating vessel 2. By connecting the clean oil collection pipeline to the clean oil outlet of each heating vessel 2, the clean oil after it has been treated by multiple heating vessels 2 can be collected in a centralized manner. For example, the heating vessels 2 can be connected in parallel through pipelines, and each pipeline can be equipped with an electric valve to achieve automatic control by the control system. Then, they can be connected to a main pipeline, which simplifies the pipeline layout for clean oil collection, reduces the loss during the clean oil transportation process, and improves the convenience and efficiency of clean oil collection.

[0027] The control system is electrically connected to the heating kettle 2 and the conveying pump 3 to realize intelligent control of the working process. By electrically connecting the control system to the heating kettle 2 and the conveying pump 3, the material conveying rate, heating, stirring and settling of the heating kettle 2 and other process links can be centrally controlled, replacing manual operation, reducing human error and ensuring the consistency and stability of dehydration and impurity removal effect.

[0028] As can be seen from the above scheme, the present invention, by adopting the design of temporary homogenization in the oil buffer tank 1, heating sedimentation separation in the heating kettle 2, and subsequent collection of purified oil, can realize the automated continuous processing of water and sludge separation of crude cooking oil, improve the dehydration and impurity removal effect and water and sludge separation efficiency, effectively solve the problem of high water and sludge content in crude cooking oil, and can stably reduce the water and sludge content in crude oil from 3~10% to below 1.5%, improve the quality of cooking bio-oil, and meet the raw material requirements for subsequent refining and processing.

[0029] In some embodiments, the system also includes an oil storage tank connected to a clean oil collection pipeline, i.e., connected to the end of the main pipe, for collecting and storing clean oil after it has been treated by the heating vessel 2; optionally, the oil storage tank is positioned lower than the heating vessel 2, so that the clean oil can flow to the oil storage tank by gravity.

[0030] In this embodiment, the grease buffer tank 1 is equipped with a level gauge and a temperature sensor. Both the level gauge and the temperature sensor are electrically connected to the control system. The level gauge can be a high-precision radar level gauge or a hydrostatic level transmitter, which can continuously output a 4-20mA signal to the control system for precise control of the liquid level in the buffer tank.

[0031] In some embodiments, the grease buffer tank 1 described above has a vertical cylindrical conical bottom structure with a conical bottom angle greater than or equal to 60°, and is equipped with a stirrer.

[0032] like Figure 2 As shown, at least two transfer pumps 3 are configured, with the two transfer pumps 3 connected in parallel to form a one-in-use and one-in-standby configuration. They share the same oil inlet and outlet manifold. Each rotor pump is independently equipped with a self-control valve, a manual maintenance valve, and a check valve at its inlet and outlet ends. The control circuits and power lines of the two transfer pumps 3 are independent of each other. When a single pump fails and needs maintenance, its corresponding manual maintenance valve can be closed to achieve complete isolation from the system pipeline, and the other transfer pump 3 can be started without affecting the overall operation of the system.

[0033] Optionally, the aforementioned delivery pump 3 is a variable frequency pump, and the control system is configured to adjust the speed of the delivery pump 3 according to the liquid level signal of the grease buffer tank 1 in order to stably supply material to the heating vessel 2.

[0034] In some embodiments, the heating vessel 2 is a steam heating vessel. The heating vessel 2 is equipped with a jacketed inner coil steam heating structure and a stirrer. The stirrer is a frame stirrer, and the stirring paddle of the stirrer is equipped with a wall scraping structure. The operating speed is 30-60 rpm to ensure uniform heating and prevent local overheating.

[0035] Specifically, the jacket of the steam heating vessel is a sealed structure integrally welded with the vessel body. The jacket is made of stainless steel. A heating chamber is formed between the jacket and the outer wall of the vessel body. A spiral coil is installed in the heating chamber. The steam inlet end of the coil is connected to the upper part of the jacket, and the condensate outlet end of the coil is connected to the lower part of the jacket. The outer side of the jacket is covered with a heat insulation layer. The jacket is also equipped with a pressure gauge interface and a drain port.

[0036] like Figure 1 As shown, the bottom of the steam heating vessel is a conical head, and a drain outlet is provided at the bottom of the conical head. An oil drain outlet is provided on the lower side of the steam heating vessel, above the drain outlet. The steam heating vessel is also equipped with a PT100 temperature sensor, a sight glass and observation light, a steam inlet and a condensate outlet.

[0037] It should be noted that the steam heating kettle is a product of existing technology, and its structure and principle are not the focus of this article, so they will not be discussed further here.

[0038] Optionally, strip-shaped scrapers are provided on both sides of the vertical outer frame of the frame-type stirring paddle along the length direction. The height of the strip-shaped scrapers is adapted to the effective liquid height in the steam heating vessel. The strip-shaped scrapers can be made of wear-resistant polytetrafluoroethylene material, with rounded chamfers at the ends to avoid scratching the polished inner wall of the vessel. The scrapers are detachably fixed to the stirring paddle by bolts. Bolt mounting holes are preset at corresponding positions on the stirring paddle. Long strip-shaped adjustment holes are opened on the scrapers. The gap between the scrapers and the inner wall of the vessel can be finely adjusted by adjusting the position of the bolts in the long strip-shaped holes.

[0039] In this embodiment, the control system sequentially performs feeding, heating and stirring, static settling, drainage of impurities, and oil discharge processes on a single heating vessel 2. Preferably, the number of heating vessels 2 is at least four, arranged in a rectangular array, and can operate in a mode of at least two in use and two in standby. That is, the control system controls two of the heating vessels 2 to be in the heating or settling process, and the other two heating vessels 2 to be in the feeding, drainage of impurities, or oil discharge process. In other words, the corresponding processes of each heating vessel 2 are staggered in time, so that at any given time at least one heating vessel 2 is in the feeding or oil discharge state, so that the system can continuously process crude oil from the oil buffer tank 1.

[0040] Furthermore, the control system can flexibly adjust the number of heating kettles 2 in operation according to the amount of crude oil supplied. For example, it can start 3 or 4 heating kettles 2 in parallel to stagger peak operations, or it can start only 1 heating kettle 2 while the rest are in standby (empty kettles waiting to be started).

[0041] Specifically, under normal conditions, the control system controls two heating vessels 2 as the main operating vessels to execute the above complete batch cycle. The other two vessels serve as auxiliary regulating vessels, dynamically switching between feeding, settling, or standby states according to the process progress of the main operating vessels, ensuring that there are always two heating vessels 2 in the system in an effective processing state of heating and stirring or static settling.

[0042] For example, when any main operating vessel completes heating and stirring and enters the settling stage, an auxiliary regulating vessel simultaneously starts its feeding process; when any main operating vessel enters the drainage or oil discharge stage, another auxiliary regulating vessel simultaneously enters the heating and stirring stage, achieving staggered operation of the processes. When any main operating vessel malfunctions, the control system can immediately trigger a fault alarm, automatically close all branch valves of the faulty vessel to isolate it from the system pipeline, and switch the nearest auxiliary regulating vessel to the main operating vessel, automatically starting subsequent processes according to preset process parameters to ensure uninterrupted processing.

[0043] In this embodiment, a water and impurity treatment unit is also included. The water and impurity treatment unit includes a liquid collection tank and a screw conveyor 4. The liquid collection tank is located below the drain outlet of the heating kettle 2. The screw conveyor 4 is connected to the liquid collection tank and is used to transport water slag material.

[0044] Optionally, the collection tank is made of stainless steel with a polished inner wall. The bottom is designed as an inclined surface towards the feed end of the screw conveyor 4 to ensure that the water and slag materials in the tank automatically flow by gravity. The top of the tank is equipped with a removable protective cover to prevent debris from falling in. The collection tank has a discharge port at the flow end, which can be connected to the feed port of the screw conveyor 4 by a flange seal. The collection tank is equipped with a cleaning port that can be connected to a flushing water pipeline for easy cleaning of the tank later.

[0045] The screw conveyor 4 is a shaftless screw conveyor, horizontally arranged at the discharge end of the liquid collection tank. It relies on the gravity flow of the liquid collection tank to achieve automatic feeding without the need for additional feeding power. By adopting a shaftless structure design, the phenomenon of water slag material entanglement and jamming is avoided. The screw blades adopt a wear-resistant and thickened design, and the conveying speed is adjustable at low speed (5-15 rpm) to ensure stable conveying of water slag material. The outer shell of the conveyor is a closed tubular structure to isolate the material from contact with the outside.

[0046] This configuration, by arranging the liquid collection tank below the drainage outlet, solves the problem of material splashing and dripping during the drainage process of the heating kettle 2, avoids water slag contaminating the equipment and the ground, and reduces the amount of subsequent cleaning work; the screw conveyor 4 directs the water slag material of the heating kettle 2 to the designated collection location, realizing the centralized collection and treatment of water slag, and the shaftless screw conveyor is suitable for the characteristics of high viscosity, easy entanglement, and high water content of kitchen crude oil water slag, avoiding the problem of entanglement and jamming, and ensuring that there is no water slag material residue.

[0047] In some embodiments, the collection tank is an integral tank structure, arranged linearly below the drain outlets of the four heating vessels 2, simultaneously receiving the slag material from the four heating vessels 2. The drain outlet of each heating vessel 2 corresponds directly to an independent receiving area of ​​the collection tank, ensuring that there is no leakage or overflow of material during the drainage process, and that the drainage of slag from one vessel does not affect the material receiving of other vessels. Then, the slag material from the four heating vessels 2 is directionally transported to a designated collection unit by a screw conveyor 4, realizing centralized collection and unified treatment of slag, and avoiding random piling of slag.

[0048] like Figure 2 As shown, a pair of first conveyors and a second conveyor are provided. The pair of first conveyors are arranged parallel to each other along the first direction and correspond to the two heating kettles 2 respectively. The second conveyor is arranged along the second direction and corresponds to the discharge end of the first conveyor. It is used to collect the water and impurities conveyed by the two first conveyors. The second direction is perpendicular to the first direction.

[0049] In this embodiment, the drain port of the heating vessel 2 is connected to a drain electric valve, which is electrically connected to the control system. The control system is used to control the drain electric valve to drain impurities in an intermittent mode, including opening for a first preset time and then closing, and closing for a second preset time and then opening, wherein the first preset time is less than the second preset time.

[0050] Preferably, the screw conveyor 4 and the drain valve of the heating vessel 2 are electrically connected through the control system and start and stop in tandem. When the heating vessel 2 opens the drain valve, the conveyor starts automatically. After the heating vessel 2 has drained the waste and closed the valve, the conveyor stops after a delay of 10-20 seconds to ensure that all the water and slag material in the collection tank has been transported out without any residue.

[0051] In this embodiment, a steam pipeline is also included. The steam pipeline includes a first main pipeline 5 and multiple first branch pipelines 6. The first main pipeline 5 is equipped with a pressure reducing valve. The first branch pipelines 6 are connected between the heating vessel 2 and the first main pipeline 5. Each first branch pipeline 6 of the heating vessel 2 is equipped with an electric regulating valve 10. The electric regulating valve 10 is electrically connected to the control system.

[0052] This configuration, by equipping each heating vessel 2 with an independent first branch 6 and an electric regulating valve 10, combined with the electrical connection between the regulating valve and the control system, allows for individual and precise PID regulation of the steam input of a single heating vessel 2. This perfectly adapts to the staggered, independent operation characteristics of the four heating vessels 2, allowing each vessel to flexibly adjust its steam input according to its own process stage. The control system automatically adjusts the opening of the corresponding electric regulating valve 10 in the first branch 6 based on the real-time temperature feedback from the PT100 temperature sensor of each heating vessel 2, achieving precise temperature control. This ensures that the crude oil in each heating vessel 2 is stably heated to the preset process temperature, with minimal temperature deviation during the constant temperature phase. This effectively guarantees consistent dehydration and impurity removal effects for crude oil processed in different batches and different vessels, ensuring that the water and slag content is stably reduced to below 1.5%.

[0053] In this embodiment, a condensate recovery pipeline 9 is also included. The condensate recovery pipeline 9 is connected to the condensate outlet of each heating vessel 2 and is used to collect the condensate from each heating vessel 2 and send it to the rinsing water tank.

[0054] With this setup, the condensate from each heating vessel 2 after heat exchange is collected and transported to the rinsing water tank via a recovery pipeline. This can replace fresh water as the system's rinsing water, reducing the consumption of fresh industrial water and lowering costs. Compared to using room temperature fresh water, the residual heat in the recovered condensate reduces the energy consumption for subsequent rinsing water heating and minimizes energy waste caused by direct heat emissions.

[0055] In this embodiment, a clean oil collection pipeline is also included. The clean oil collection pipeline includes a second main pipeline 7 and multiple second branch pipelines 8. The two ends of the second branch pipelines 8 are respectively connected to the oil outlet of the heating vessel 2 and the first main pipeline. The second main pipeline 7 is connected to an oil storage tank. Each second branch pipeline 8 is equipped with an electric gate valve 11, which is electrically connected to the control system.

[0056] With this setup, the purified oil flows by gravity along the second branch 8 and the second main branch 7 to the grease storage tank, eliminating the need for separate purified oil storage and conveying devices for each heating vessel 2. This significantly simplifies on-site pipeline laying and reduces the amount of pipe joints, valves, and other accessories used. Simultaneously, the unified confluence method shortens the purified oil conveying path, reduces residual oil loss in the pipeline, and decreases the workload and cost of subsequent pipeline maintenance and cleaning. Each second branch 8 is equipped with an independent electric gate valve 11 electrically connected to the control system. The control system automatically and precisely opens and closes the valves according to the process progress of the heating vessel 2. The electric gate valve 11 is only opened after the corresponding vessel has completed drainage and settling; otherwise, it remains closed. This prevents cross-mixing of oil and unseparated water-sludge media from different vessels, while also preventing purified oil backflow, effectively ensuring the purity of the collected purified oil and ensuring that the water-sludge content is stably controlled below 1.5%.

[0057] In this embodiment, the control system includes a PLC main controller and an HMI (Human Machine Interface) touchscreen. The PLC main controller is electrically connected to the HMI touchscreen, field monitoring instruments, and actuators. The field monitoring instruments are sensors for each device, and the actuators are the drive components for valves, pumps, and agitators in each device. The HMI of the control system can display the real-time operating status and process parameters of the four heating reactors 2. The operating status includes feeding, heating and stirring, settling, draining impurities, draining oil, standby, and fault.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for dehydrating and removing impurities from crude kitchen grease, characterized in that, include: Grease buffer tank (1), used to receive and store crude grease; Multiple heating vessels (2) are connected in parallel for heating, stirring and settling separation of crude oil; A delivery pump (3) is connected between the grease buffer tank (1) and the heating vessel (2) for conveying crude grease from the grease buffer tank (1) to the heating vessel (2). The clean oil collection pipeline is connected to the clean oil outlet of each of the heating kettles (2) and is used to collect the clean oil after it has been treated by the heating kettles (2); The control system is electrically connected to the heating vessel (2) and the delivery pump (3).

2. The kitchen grease dehydration and impurity removal system according to claim 1, characterized in that, The grease buffer tank (1) is equipped with a level gauge and a temperature sensor, both of which are electrically connected to the control system.

3. The kitchen grease dehydration and impurity removal system according to claim 2, characterized in that, The delivery pump (3) is a variable frequency pump, and the control system is configured to adjust the speed of the delivery pump (3) according to the liquid level signal of the grease buffer tank (1) in order to stably supply material to the heating vessel (2).

4. The kitchen grease dehydration and impurity removal system according to claim 1, characterized in that, The heating vessel (2) is a steam heating vessel, and the heating vessel (2) is equipped with a jacketed inner coil steam heating structure and a stirrer.

5. The kitchen grease dehydration and impurity removal system according to claim 4, characterized in that, The heating vessel (2) is equipped with a stirrer, which is a frame stirrer, and the stirring paddle of the stirrer is equipped with a wall scraping structure.

6. The system for dehydrating and removing impurities from crude kitchen grease according to any one of claims 1-5, characterized in that, It also includes a water and impurity treatment unit, which includes a liquid collection tank and a screw conveyor (4). The liquid collection tank is located below the drain outlet of the heating kettle (2), and the screw conveyor (4) is connected to the liquid collection tank for conveying water slag material.

7. The system for dehydrating and removing impurities from crude kitchen grease according to any one of claims 1-5, characterized in that, It also includes a steam pipeline, which includes a first main pipeline (5) and multiple first branch pipelines (6). The first main pipeline (5) is equipped with a pressure reducing valve. The first branch pipelines (6) are connected between the heating vessel (2) and the first main pipeline (5). Each of the first branch pipelines (6) of the heating vessel (2) is equipped with an electric regulating valve (10). The electric regulating valve (10) is electrically connected to the control system.

8. The kitchen grease dehydration and impurity removal system according to claim 7, characterized in that, It also includes a condensate recovery pipeline (9), which is connected to the condensate outlet of each of the heating vessels (2) and is used to collect the condensate from each of the heating vessels (2) and send it to the rinsing water tank.

9. The kitchen grease dehydration and impurity removal system according to claim 7, characterized in that, It also includes a clean oil collection pipeline, which includes a second main pipeline (7) and multiple second branch pipelines (8). The two ends of the second branch pipelines (8) are respectively connected to the oil outlet of the heating vessel (2) and the second main pipeline (7). The second main pipeline (7) is connected to an oil storage tank. Each second branch pipeline (8) is equipped with an electric gate valve (11), which is electrically connected to the control system.

10. The kitchen grease dehydration and impurity removal system according to claim 6, characterized in that, The drain port of the heating vessel (2) is connected to a drain valve, which is electrically connected to the control system. The control system is used to control the drain valve to drain impurities in an intermittent mode, including opening for a first preset time and then closing, and closing for a second preset time and then opening, wherein the first preset time is less than the second preset time.

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