Screening and deslagging equipment and waste edible oil and fat purification device

Abstract

The embodiment of the utility model relates to the technical field of grease chemical equipment, and discloses screening and deslagging equipment and a waste edible grease purification device. The driving assembly is arranged in the shell; the straight cylinder type screen is fixed in the shell and is used for filtering the materials; and the rotating shaft penetrates through the straight cylinder type screen, one end of the rotating shaft is connected with the driving assembly, the other end of the rotating shaft is rotationally connected to the shell, and the rotating shaft is driven by the driving assembly to rotate at the rotating speed not lower than a preset rotating speed threshold value to form a centrifugal effect on materials in the straight cylinder type screen. By means of the mode, the fine particle impurity separation efficiency of the screening and deslagging equipment is improved while stable operation of the screening and deslagging equipment is kept.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and fat chemical equipment, in particular to a screening and slag removing device and a waste edible oil purification device. BACKGROUND

[0002] Waste water discharged by the catering industry contains rich animal and vegetable oils. If these oils are not treated and directly enter the municipal sewage pipe network, it will bring many troubles to sewage treatment. Therefore, this kind of waste water will pass through a specially set oil separation tank. The oil separation tank needs to be cleaned every period of time. The cleaned material is solid oil, liquid oil, water and waste edible oil. The waste edible oil has high oil content. The oil in the waste edible oil is recovered to produce bio-diesel and other products, which has economic value. However, the first step is to treat the waste edible oil and extract high-purity crude oil therefrom.

[0003] In the prior art, the method for removing fine particle impurities is usually to use a drum screen or a rotary drum grating machine to screen the fine particle impurities. However, the trench oil discharged by the catering industry still has certain viscosity after being heated by steam in the receiving hopper, which reduces the operation efficiency of the screening and slag removing device such as the drum screen or the rotary drum grating machine.

[0004] Therefore, how to improve the separation efficiency of fine particle impurities has become a technical problem to be solved. CONTENT OF THE INVENTION

[0005] In view of the above problems, the present application provides a screening and slag removing device and a waste edible oil purification device for improving the separation efficiency of fine particle impurities.

[0006] According to one aspect of the present application, a screening and slag removing device is provided for screening and slag removing of waste edible oil material. The screening and slag removing device comprises: a shell; a driving assembly arranged inside the shell; a straight cylinder type screen fixed inside the shell for filtering the material; a rotating shaft penetrating through the straight cylinder type screen, one end of the rotating shaft being connected with the driving assembly, and the other end of the rotating shaft being rotatably connected with the shell, for rotating at a rotation speed not lower than a preset rotation speed threshold under the driving of the driving assembly to form a centrifugal action on the material in the straight cylinder type screen.

[0007] Preferably, the top of the shell is provided with a feeding port, the bottom of the shell is provided with a discharging port, and the side of the shell is provided with a slagging port, which is close to the barrel opening of the straight-cylinder sieve; the part of the rotating shaft outside the straight-cylinder sieve is provided with first spiral blades, which are aligned with the feeding port and used to stir the material falling from the feeding port into the straight-cylinder sieve; the discharging port is aligned with the screen surface of the straight-cylinder sieve and used to collect the filtrate after impurity removal by the straight-cylinder sieve; the part of the rotating shaft inside the straight-cylinder sieve is provided with second spiral blades, the pitch of the second spiral blades is wider than that of the first spiral blades, and the second spiral blades are aligned with the slagging port and used to stir the material in the straight-cylinder sieve to the slagging port.

[0008] Preferably, the screening and slagging device further comprises a receiving hopper, which is clamped to the discharging port.

[0009] Preferably, the screening and slagging device further comprises a baffle, which is used to divide the internal space of the shell into a first space and a second space; the driving assembly is arranged in the first space, the straight-cylinder sieve and the rotating shaft are arranged in the second space, and one end of the rotating shaft is rotationally connected to the baffle.

[0010] Preferably, the rotating speed of the rotating shaft ranges from 800 r / min to 1500 r / min.

[0011] Preferably, the screen aperture of the straight-cylinder sieve is 6 mm, and the rotating speed of the rotating shaft is 1200 r / min.

[0012] According to another aspect of the embodiments of the present application, a waste edible oil purification device is provided, which comprises: a receiving hopper, which is internally provided with a steam direct injection pipe, a bottom provided with a sieve, and a bottom surface provided with a discharging port, the steam direct injection pipe being used to heat the waste edible oil entering the receiving hopper, and the sieve being used to separate impurities in the heated waste edible oil; a screening and slagging device as described in any of the above embodiments, which is provided with a feeding port at the top and a discharging port at the bottom, and the feeding port of the screening and slagging device is connected with the discharging port of the receiving hopper, and is used to flow in the waste edible oil that has been heated and separated by the receiving hopper; a slurry buffer tank, which is connected with the discharging port of the screening and slagging device, and is used to collect the waste edible oil that has been processed by the screening and slagging device, and to deliver the waste edible oil stored in the slurry buffer tank to a heating tank; the heating tank, which is connected with the slurry buffer tank, and is used to heat the waste edible oil delivered from the slurry buffer tank; and a three-phase centrifuge, which is provided with an oil phase outlet and connected with the heating tank, and is used to perform centrifugal processing on the waste edible oil delivered from the slurry buffer tank, and separate out oil phase substances; and an oil and fat buffer tank, which is connected with the oil phase outlet, and is used to store the oil phase substances flowing in from the oil phase outlet.

[0013] Preferably, the waste edible oil purification device further comprises an oil storage tank, a first three-way valve, a second three-way valve and a third three-way valve; the first three-way valve comprises a fluid inlet connected with the oil phase outlet, a first fluid outlet connected with the oil storage tank, and a second fluid outlet connected with the slurry storage tank; the second three-way valve comprises a fluid inlet connected with the oil storage tank, a first fluid outlet connected with the oil storage tank, and a second fluid outlet connected with the slurry storage tank; the third three-way valve comprises a fluid inlet connected with the oil storage tank, a first fluid outlet connected with an external oil tank truck, and a second fluid outlet connected with the slurry storage tank.

[0014] Preferably, a glass sight glass is arranged at the fluid inlet of the first three-way valve, the second three-way valve and the third three-way valve.

[0015] Preferably, the receiving hopper is further provided with a hydraulic cover plate and a temperature sensor.

[0016] The embodiment of the present application keeps the straight cylinder sieve screen stationary by fixing the straight cylinder sieve screen inside the shell, sets a rotating shaft in the straight cylinder sieve screen, and sets the rotating shaft to rotate at high speed to form a centrifugal effect on the materials in the sieve screen. The waste edible oil and other materials move at high speed under the centrifugal force and are difficult to adhere to the sieve screen, thereby reducing the probability of the waste edible oil and other materials adhering to the sieve screen as much as possible, improving the separation efficiency of the fine particle impurities by the screening and slag removing equipment, and further improving the purification efficiency of the waste edible oil purification device.

[0017] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, the present application can be implemented in accordance with the content of the specification, and in order to enable the above and other purposes, features and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the attached drawings refer to the same or similar components. In the drawings:

[0019] Figure 1 A perspective view of the screening and slag removing equipment provided by the embodiment of the present application is shown;

[0020] Figure 2 A side view of the screening and slag removing equipment provided by the embodiment of the present application is shown;

[0021] Figure 3 A sectional view of the embodiment of the present application along the direction A-A is shown; Figure 2 ​

[0022] Figure 4 An exploded view of the straight cylinder screen and the rotating shaft is shown;

[0023] Figure 5 A structural diagram of the waste edible oil purification device is shown.

[0024] The reference signs in the detailed description are as follows:

[0025] 1. A screening and slagging device;

[0026] 11. A housing; 111, a feeding port; 112, a discharging port; 113, a slagging port; 114, a first space; 115, a second space;

[0027] 12. A driving assembly; 13, a straight cylinder screen; 14, a rotating shaft; 141, a first spiral blade; 142, a second spiral blade; 15, a receiving hopper; 16, a baffle plate;

[0028] 2. A waste edible oil purification device;

[0029] 21. A receiving hopper; 22, a slurry buffer tank; 23, a heating tank; 24, a three-phase centrifuge; 25, an oil buffer tank; 26, an oil storage tank; 27, a first three-way valve; 28, a second three-way valve; 29, a third three-way valve. DETAILED DESCRIPTION

[0030] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0033] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0034] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A, A and B, and B. In addition, the character“ / ” herein generally means that the front and rear associated objects are in an“or” relationship.

[0035] In the description of the embodiments of the application, the term“a plurality of” means two or more (including two), and similarly, “a plurality of groups” means two or more groups (including two groups), and “a plurality of pieces” means two or more pieces (including two pieces).

[0036] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0037] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0038] The existing screening and slag removal equipment usually selects a shaftless roller screen to filter the materials. However, the shaftless roller screen has a low rotating speed, and the waste edible oil and other materials are easy to adhere to the screen, so that the running efficiency of the screening and slag removal equipment is low.

[0039] To address the specific problem that waste cooking oil and other materials easily stick to the screen, the inventors of this application first increased the rotation speed of the shaftless drum screen, so that the materials sticking to the screen could be thrown out of the screen.

[0040] However, the inventors of this application discovered in actual improvements that connecting one end face of the shaftless drum screen to the drive assembly, limited by the volume and weight of the shaftless drum screen, can easily lead to instability in the operation of the screening and slag removal equipment due to rapid rotation of the shaftless drum screen, thus causing equipment failure.

[0041] Based on this, the inventors of this application discovered that by fixing the screen and keeping it stationary, a rotating shaft can be set inside the screen and made to rotate at high speed to create a centrifugal force on the material inside the screen. Waste edible oil and other materials move at high speed under centrifugal force, making it difficult for them to stick to the screen. Thus, while maintaining the stable operation of the screening and slag removal equipment, the probability of waste edible oil and other materials sticking to the screen is reduced as much as possible, thereby improving the separation efficiency of the screening and slag removal equipment for fine particulate impurities.

[0042] Specifically, you can refer to Figures 1-4 The screening and slag removal equipment 1 is used to screen and remove slag from waste edible oil. The screening and slag removal equipment 1 includes: a shell 11; a drive assembly 12, which is located inside the shell 11; a cylindrical screen 13, which is fixed inside the shell 11 and used to filter the material; and a rotating shaft 14, which passes through the cylindrical screen 13, with one end connected to the drive assembly 12 and the other end rotatably connected to the shell 11. The shaft is used to rotate at a speed not lower than a preset speed threshold under the drive of the drive assembly 12, thereby creating a centrifugal effect on the material inside the cylindrical screen 13.

[0043] The outer casing 11 has a feed inlet 111 at the top, a discharge outlet 112 at the bottom, and a slag outlet 113 on the side, which is close to the opening of the cylindrical screen 13. The rotating shaft 14 has a first spiral blade 141 on the part outside the cylindrical screen 13, which is aligned with the feed inlet 111 and is used to stir the material falling from the feed inlet 111 into the cylindrical screen 13. The discharge outlet 112 is aligned with the screen surface of the cylindrical screen 13 and is used to collect the filtrate after impurity removal by the cylindrical screen 13. The rotating shaft 14 has a second spiral blade 142 on the part inside the cylindrical screen 13, which has a wider pitch than the first spiral blade 141 and is aligned with the slag outlet 113, which is used to stir the material from the cylindrical screen 13 to the slag outlet 113.

[0044] The first spiral blade 141 is provided with a narrow pitch to quickly stir the material falling from the feed port 111 into the straight cylinder screen 13; the second spiral blade 142 is provided with a wide pitch to prevent the straight cylinder screen 13 from being easily blocked, and the material in the straight cylinder screen 13 can move to the slag outlet 113 more smoothly while being separated by centrifugal force.

[0045] The screening and slag removal equipment 1 further comprises a receiving hopper 15 which is clamped to the discharge port 112 to improve the collection efficiency of the filtrate obtained by filtering the straight cylinder screen 13.

[0046] The screening and slag removal equipment 1 further comprises a baffle 16 which is used to divide the internal space of the shell 11 into a first space 114 and a second space 115; the driving assembly 12 is arranged in the first space 114, and the straight cylinder screen 13 and the rotating shaft 14 are arranged in the second space 115, one end of the rotating shaft 14 being rotatably connected to the baffle 16 to dry-wet separate the internal space of the shell 11 through the baffle 16, so as to avoid the filtrate filtered by the straight cylinder screen 13 from splashing onto the driving assembly 12 and causing the driving assembly 12 to malfunction.

[0047] Preferably, the screen aperture of the straight cylinder screen 13 is 6 mm, and the rotating speed of the rotating shaft 14 is 1200 r / min. The rotating speed of the rotating shaft 14 is not less than 800 r / min to ensure the formation of centrifugal force as much as possible, and the rotating speed of the rotating shaft 14 is not more than 1500 r / min to ensure the stability of the operation of the screening and slag removal equipment 1.

[0048] After the large impurities in the waste edible oil are preliminarily separated, the waste edible oil after removing the large impurities enters the screening and slag removal equipment 1 through the feed port 111, and under the driving of the driving motor of the driving assembly 12, the first spiral blade 141 and the second spiral blade 142 rotate at a high speed, and the material falls from the feed port 111 into the first spiral blade 141, which pushes the material into the interior of the straight cylinder screen 13. If the aperture of the straight cylinder screen 13 is 6 mm, the impurities with a particle diameter greater than 6 mm are intercepted in the interior of the straight cylinder screen 13 and are pushed to the slag outlet 113 by the second spiral blade 142 for output and transportation, and the slurry with a particle diameter less than 6 mm is discharged from the discharge port 112 through the screen hole.

[0049] For the separation of fine particles, the high-speed rotating screening and dreg removal device 1 is used to replace the low-speed rotating drum screen or drum grating machine in the prior art. The screening and dreg removal device 1 is in a high-speed rotating state during operation to form a centrifugal force on the impurities in the screen, so that the amount of material passing through the screen per unit time is greatly increased, the waste edible oil is not easy to adhere to the screen of the device, the cleaning frequency of the screen is reduced to a certain extent, the separation efficiency of fine particles is improved, and the influence of the viscosity of the waste edible oil on the screen of the device is reduced.

[0050] Please refer to Figure 5 The waste edible oil purification device 2 provided by the embodiment of the present application comprises: a receiving hopper 21, which is internally provided with a steam direct injection pipe, is provided at the bottom with a screen, and is provided at the bottom surface with a discharge port 112; the steam direct injection pipe is used to heat the waste edible oil entering the receiving hopper 21, and the screen is used to separate the impurities in the heated waste edible oil; the screening and dreg removal device 1 as described in any of the above embodiments, which is provided at the top with a feed inlet 111 and at the bottom with a discharge port 112; the feed inlet 111 of the screening and dreg removal device 1 is connected with the discharge port 112 of the receiving hopper 21, and is used to flow in the waste edible oil that has been heated and separated by the receiving hopper 21; a slurry buffer tank 22, which is connected with the discharge port 112 of the screening and dreg removal device 1, is used to collect the waste edible oil treated by the screening and dreg removal device 1, and to transport the waste edible oil stored in the slurry buffer tank 22 to a heating tank 23; the heating tank 23, which is connected with the slurry buffer tank 22, is used to heat the waste edible oil transported from the slurry buffer tank 22; a three-phase centrifuge 24, which is provided with an oil phase outlet and is connected with the heating tank 23, is used to perform centrifugal treatment on the waste edible oil transported from the slurry buffer tank 22, and to separate out oil phase substances; and an oil storage tank 25, which is connected with the oil phase outlet, is used to store the oil phase substances flowing in from the oil phase outlet.

[0051] Preferably, the waste edible oil purification device 2 further comprises an oil storage tank 26, a first three-way valve 27, a second three-way valve 28, and a third three-way valve 29; the first three-way valve 27 comprises a fluid inlet connected with the oil phase outlet, a first fluid outlet connected with the oil storage tank 25, and a second fluid outlet connected with the slurry buffer tank 22; the second three-way valve 28 comprises a fluid inlet connected with the oil storage tank 25, a first fluid outlet connected with the oil storage tank 26, and a second fluid outlet connected with the slurry buffer tank 22; and the third three-way valve 29 comprises a fluid inlet connected with the oil storage tank 26, a first fluid outlet connected with an external oil tank truck, and a second fluid outlet connected with the slurry buffer tank 22; a glass sight glass is arranged at the fluid inlet of each of the first three-way valve 27, the second three-way valve 28, and the third three-way valve 29.

[0052] Preferably, the receiving hopper 21 is further provided with a hydraulic cover plate and a temperature sensor.

[0053] Preferably, the heating temperature of the heating tank 23 is 80℃.

[0054] The waste edible oil purification device 2 realizes the automatic purification of waste edible oil through the processes of material receiving and heating, residue removal by screening, slurry heating, three-phase separation, and oil storage.

[0055] During the material receiving and heating, the waste edible oil is unloaded into the receiving hopper 21 by a dumper or a dumper barrel. The bottom of the receiving hopper 21 is provided with a steam direct injection pipe, and a plurality of 10mm through holes are arranged on the steam pipe.

[0056] The waste edible oil is heated and melted by the steam direct injection pipe in the receiving hopper 21. In some cold areas or winter, due to the low temperature, the waste edible oil is easy to solidify into blocks, which causes blockage when unloaded into the receiving hopper 21, and thus cannot smoothly enter the next process. The steam direct injection heating ensures the continuity and stability of the operation of the waste edible oil purification device 2.

[0057] The waste edible oil is initially heated and demulsified. Due to the complex composition of the waste edible oil, part of the oil appears emulsification phenomenon. If demulsification is not performed, the oil dispersed in water in the subsequent oil extraction process cannot be extracted, which reduces the oil extraction rate of the entire waste edible oil purification device 2. The steam in the receiving hopper 21 demulsifies the oil, improving the efficiency of the subsequent process.

[0058] The receiving hopper 21 is provided with a hydraulic cover plate and a temperature sensor, and the steam pipe is controlled to open and close by an automatic valve. During the heating and demulsification process, the cover plate is closed for a period of time. The interlocking of the temperature sensor and the steam automatic valve makes the entire process completely automatic, reduces manual operation, and improves the stability and convenience of the waste edible oil purification device 2.

[0059] At the same time, the bottom of the receiving hopper 21 is also provided with a screen to preliminarily separate large impurities in the waste edible oil, preventing large impurities from entering the subsequent processing process.

[0060] In the process of screening and deslagging, the waste edible oil after removing large impurities is discharged from the bottom of the receiving hopper 21 through the automatic valve control and flows into the inlet 111. The flow rate of the inlet can be manually adjusted through the lower inlet manual regulating valve. The middle part of the screening and deslagging equipment 1 is provided with a straight cylinder screen 13. When the first spiral blade 141 and the second spiral blade 142 are rotated at high speed under the drive of the motor, the material falls into the first spiral blade 141 from the inlet 111, and the material is pushed into the inside of the screen by the first spiral blade 141. The screen aperture is 6 mm, and the impurities with a particle diameter greater than 6 mm are intercepted in the inside of the screen and are pushed to the deslagging outlet 113 for output and transportation. The slurry with a particle diameter less than 6 mm passes through the screen hole and is discharged from the outlet 112 to the slurry buffer tank 22 for buffering.

[0061] The slurry buffer tank 22 is also provided with a steam direct injection pipe, which is manually opened and closed. When the temperature condition is low, the front steam valve is opened to heat the slurry in the tank, so that the waste edible oil maintains a medium temperature condition in the whole front end treatment process, thereby saving time for heating before oil extraction by the three-phase centrifuge 24.

[0062] In the process of slurry heating, the buffered slurry is lifted from the slurry buffer tank 22 to the heating tank 23 by the lifting pump. This stage is the key stage for improving the oil extraction efficiency of the waste edible oil. Through steam heating and the temperature sensor provided on the heating tank 23, the temperature of the slurry in the tank is maintained at about 80℃. The slurry is cooked in the tank for a period of time, and at the same time, the solid organic matter in the slurry is maximized to separate into the liquid phase by the action of the agitator on the top of the tank, which is beneficial to the recycling of the organic matter and reduces the final deslagging amount of the waste edible oil purification device 2, thereby saving a part of the solid residue disposal cost.

[0063] Meanwhile, the bottom of the heating tank 23 is provided with a conical bottom, and the lowest point of the conical bottom is provided with a sand discharge port and a manual sand discharge valve. The sand in the tank is discharged regularly to prevent sand from entering the rear-end three-phase centrifuge 24, thereby reducing the risk of wear and tear of the equipment in the waste edible oil purification device 2 and prolonging the service life of the equipment.

[0064] In the process of three-phase separation, the cooked organic slurry is transported to the three-phase centrifuge 24 for three-phase separation by the lifting pump. The rotating drum of the three-phase centrifuge 24 generates centrifugal force by rotating at a high speed of 3200r / min, so that the water phase, the oil phase and the solid phase with different densities are separated. The separated water phase and solid phase are output from the system for subsequent treatment.

[0065] The separated oil phase outlet of the three-phase centrifuge 24 is provided with a glass sight glass and a first three-way valve 27. Since the oil extraction efficiency of the three-phase centrifuge 24 will be reduced during the start-up and shutdown stages, the quality of the oil phase can be observed through the sight glass during the running stage, that is, the water and impurities in the oil phase are visually observed, and if the quality is poor, the first three-way valve 27 is switched to return the oil to the front slurry buffer tank 22 for reprocessing. When the three-phase centrifuge 24 is running stably, the purity of the purified oil can reach more than 95%, at which time the three-way ball valve of the first three-way valve 27 is switched to the oil buffer tank 25 to save the purified oil.

[0066] During the storage of the oil, the bottom of the oil buffer tank 25 is conical, the lowest point of the conical bottom is provided with a discharge port, and a glass sight glass is provided in the discharge pipeline, and a manual switch valve is provided after the discharge lifting pump.

[0067] The volume of the oil buffer tank 25 is designed by calculation to store one day of purified oil. After the entire waste edible oil system is running, the purified oil is placed in the oil buffer tank 25 for about 12 hours. After standing, the water and impurities in the oil phase settle at the bottom of the tank. As with the oil phase outlet of the three-phase centrifuge 24, the water and impurities at the bottom of the tank are discharged to the front slurry buffer tank 22 for reprocessing by observing the discharge port sight glass and switching the second three-way valve 28 after the pump. The purity of the oil after the water and impurities are discharged is further improved to more than 97%, and the oil is transported to the oil storage tank 26 by the lifting pump.

[0068] Generally, the capacity of the oil storage tank 26 can store at least 30 days of purified oil. Since the storage time is relatively long, the third stage of water and impurities can be discharged during this period. That is, a glass sight glass and a third three-way valve 29 after the lifting pump are also provided at the discharge port of the oil storage tank 26. The water and impurities at the bottom of the tank are discharged to the front slurry buffer tank 22 for reprocessing before the oil is transported to the external oil tank truck. The purity of the oil after the water and impurities are discharged can be further improved to more than 98%.

[0069] By switching the three-way ball valves of the first three-way valve 27, the second three-way valve 28 and the third three-way valve 29, the fluid outlet can be switched, the oil from the oil phase outlet is returned to the slurry buffer tank 22, the oil from the oil buffer tank 25 is returned to the slurry buffer tank 22, and the oil from the oil storage tank 26 is returned to the slurry buffer tank 22, so as to reprocess the slurry heating and three-phase separation, thereby improving the purity of the oil.

[0070] The embodiment of the application keeps the straight cylinder sieve 13 stationary by fixing the straight cylinder sieve 13 inside the shell 11, sets a rotating shaft 14 in the straight cylinder sieve 13, and sets the rotating shaft 14 to rotate at high speed to form a centrifugal action on the materials in the sieve. The waste edible oil and other materials move at high speed under the centrifugal force and are difficult to stick to the sieve, thereby reducing the probability of the waste edible oil and other materials sticking to the sieve as much as possible while keeping the screening and slag removing equipment 1 running stably, improving the separation efficiency of the screening and slag removing equipment 1 on fine particle impurities, and further improving the purification efficiency of the waste edible oil purification device 2.

[0071] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the specification of the application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A screening and slag removal device for screening and removing slag from waste edible oil, characterized in that, The screening and slag-removing device comprises: a housing; a driving assembly arranged inside the housing; a straight-cylinder screen fixed inside the housing and used for filtering materials; a rotating shaft penetrating through the straight-cylinder screen, one end of which is connected with the driving assembly and the other end of which is rotatably connected with the housing, and used for rotating at a rotating speed not lower than a preset rotating speed threshold under the driving of the driving assembly to form a centrifugal action on the materials in the straight-cylinder screen.

2. The sizing and dewatering apparatus of claim 1, wherein, A feeding port is arranged at the top of the housing, a discharging port is arranged at the bottom of the housing, and a slag discharging port is arranged at the side of the housing, the slag discharging port being close to the cylinder port of the straight-cylinder screen; a first helical blade is arranged on the part of the rotating shaft outside the straight-cylinder screen, the first helical blade being aligned with the feeding port and used for stirring the materials falling from the feeding port into the straight-cylinder screen; the discharging port is aligned with the screen surface of the straight-cylinder screen and used for collecting the filtrate after the materials in the straight-cylinder screen are removed; a second helical blade is arranged on the part of the rotating shaft inside the straight-cylinder screen, the pitch of the second helical blade being wider than that of the first helical blade, the second helical blade being aligned with the slag discharging port and used for stirring the materials in the straight-cylinder screen to the slag discharging port.

3. The sizing and dewatering apparatus of claim 2, wherein, The screening and slag-removing device further comprises a receiving hopper which is clamped to the discharging port.

4. The sizing and dewatering apparatus of claim 1, wherein, The screening and slag-removing device further comprises a baffle which is used for dividing the internal space of the housing into a first space and a second space; the driving assembly is arranged in the first space, the straight-cylinder screen and the rotating shaft are arranged in the second space, and one end of the rotating shaft is rotatably connected with the baffle.

5. The sizing and dewatering apparatus of claim 1, wherein, The rotating speed of the rotating shaft ranges from 800 r / min to 1500 r / min.

6. The sizing and dewatering apparatus of claim 1, wherein, The screen aperture of the straight-cylinder screen is 6 mm, and the rotating speed of the rotating shaft is 1200 r / min.

7. A waste cooking oil purification apparatus characterized by comprising: The screening and slag-removing device comprises: a receiving hopper, the inside of which is provided with a steam direct injection pipe, the bottom of which is provided with a screen, and the bottom surface of which is provided with a discharging port, the steam direct injection pipe being used for heating the waste edible oil entering the receiving hopper, and the screen being used for separating the impurities in the heated waste edible oil; The screening and slag-removing device according to any one of claims 1 to 6 is provided with a feeding port at the top and a discharging port at the bottom, the feeding port of the screening and slag-removing device is connected with the discharging port of the receiving hopper, and is used for flowing in the waste edible oil which has been heated and separated by the receiving hopper; a slurry buffer tank which is connected with the discharging port of the screening and slag-removing device and is used for collecting the waste edible oil processed by the screening and slag-removing device; a heating tank which is connected with the slurry buffer tank and is used for heating the waste edible oil delivered from the slurry buffer tank; a three-phase centrifugal machine which is provided with an oil phase outlet and is connected with the heating tank, and is used for performing centrifugal processing on the waste edible oil delivered from the slurry buffer tank to separate out oil phase substances; an oil and fat buffer tank which is connected with the oil phase outlet and is used for storing the oil phase substances flowing in from the oil phase outlet.

8. The waste edible oil purification device according to claim 7, characterized in that, The waste edible oil purification device further comprises an oil storage tank, a first three-way valve, a second three-way valve and a third three-way valve. The first three-way valve comprises a fluid inlet connected with the oil outlet, a first fluid outlet connected with the oil storage tank and a second fluid outlet connected with the slurry storage tank. The second three-way valve comprises a fluid inlet connected with the oil storage tank, a first fluid outlet connected with the oil storage tank and a second fluid outlet connected with the slurry storage tank. The third three-way valve comprises a fluid inlet connected with the oil storage tank, a first fluid outlet connected with an external oil tank truck and a second fluid outlet connected with the slurry storage tank.

9. The waste cooking oil purification apparatus according to claim 8, wherein Glass view mirrors are arranged at the fluid inlets of the first three-way valve, the second three-way valve and the third three-way valve.

10. The waste cooking oil purification apparatus according to claim 7, wherein The receiving hopper is further provided with a hydraulic cover plate and a temperature sensor.

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