CN109810776B - Grease decoloring system and process containing vertical leaf filter - Google Patents
Grease decoloring system and process containing vertical leaf filter Download PDFInfo
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- CN109810776B CN109810776B CN201910253480.5A CN201910253480A CN109810776B CN 109810776 B CN109810776 B CN 109810776B CN 201910253480 A CN201910253480 A CN 201910253480A CN 109810776 B CN109810776 B CN 109810776B
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- 241000638935 Senecio crassissimus Species 0.000 title claims abstract description 58
- 239000004519 grease Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000008569 process Effects 0.000 title claims abstract description 30
- 239000004927 clay Substances 0.000 claims abstract description 80
- 238000001914 filtration Methods 0.000 claims abstract description 58
- 239000012065 filter cake Substances 0.000 claims abstract description 55
- 239000000203 mixture Substances 0.000 claims abstract description 23
- 239000002689 soil Substances 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000004891 communication Methods 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 81
- 239000007788 liquid Substances 0.000 claims description 24
- 238000004042 decolorization Methods 0.000 claims description 19
- 239000000706 filtrate Substances 0.000 claims description 19
- 238000003860 storage Methods 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 238000007781 pre-processing Methods 0.000 claims description 4
- 239000010724 circulating oil Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000003925 fat Substances 0.000 claims 4
- 235000014593 oils and fats Nutrition 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 8
- 238000004904 shortening Methods 0.000 abstract description 5
- 230000009471 action Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000019197 fats Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003264 margarine Substances 0.000 description 1
- 235000013310 margarine Nutrition 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-UHFFFAOYSA-N 0.000 description 1
- 125000005457 triglyceride group Chemical group 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/74—Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes
Abstract
The invention discloses a grease decoloring system and a process containing a vertical leaf filter, wherein the grease decoloring system comprises: clay mixing unit; a decoloring tower; a vertical leaf filter in communication with the decolorizing column; the pretreatment unit comprises a second clay mixer communicated with the vertical leaf filter, a circulating assembly for circulating the oil prefiltered by the vertical leaf filter to the second clay mixer, and a detection device arranged on an oil outlet pipeline of the vertical leaf filter, wherein when the detection result of the detection device meets the decoloring requirement, a cake is formed on a filter screen of the filter, and the oil-soil mixture in the decoloring tower enters the filter for filtering. According to the invention, a filter cake layer is formed on the filter screen of the filter while the decoloring tower is in decoloring state, so that the oil-soil mixture discharged from the decoloring tower is directly filtered by the filter cake layer and the filter screen, thereby greatly shortening the time of decoloring the oil and improving the decoloring efficiency and the processing capacity of a decoloring system.
Description
Technical Field
The invention belongs to the technical field of grease decolorization, and particularly relates to a grease decolorization system containing a vertical leaf filter, and a grease decolorization process containing the vertical leaf filter.
Background
At present, the vertical leaf filter is used as a novel filter, is widely applied to the filtering process of industries such as food, grease and the like, is an important device for solid-liquid separation, and gradually replaces a plate-frame filter with low filtering speed, high labor intensity and high grease loss.
In the processing of food or grease, there is often a problem of separation between components of different compositions and different forms, with the aim of removing harmful or useless components, retaining the active components for processing use, or separating components of different properties for processing use separately. Wherein solid-liquid separation is one of the common unit operations, and filtration is a traditional chemical unit operation, and the principle is that solid suspended matters are separated from solution when feed liquid passes through a solid filter medium.
In the process of grease preparation and processing, the technological processes of crude oil purification, grease decolorization, winterization degreasing dewaxing and the like are all carried out by filtering operation, and various filtering equipment such as a plate-frame filter, a box-type filter, a centrifugal filter, a bag filter and the like are often used. Plate and frame filters are a conventional type of filter device, with the filter plates and frames being generally square and also circular (most for small devices). The circular plate frame filter pressing is characterized in that under the condition of equal filtering areas, the sealing periphery is shortest, so that the needed pressing force is minimum, but under the condition of the same filtering areas, the external dimension is larger. The plate-frame filter is divided into an open flow type and a hidden flow type. The filtrate directly flows out from the outlet of each filter plate and is in open flow type; the filtrate is concentrated to flow out from the outlet of the fixed end plate in a dark flow mode. For example, in the winterization dewaxing process in grease processing, a plate-frame filter is used, while crude oil filtration is mostly performed by using a clarifying oil tank, etc., and the filtering machines have the advantages of low investment and suitability for small-batch production, and the defects are mainly expressed in that: continuous operation cannot be realized in the separation process, the filtration efficiency is low, the content of residual grease in a filter cake is high, the loss is large, the labor intensity is large, the single production capacity is small, and a plurality of filter cakes are used to occupy large factory building area, so that the management is not facilitated.
Along with the continuous improvement of the performance of the filter, the vertical leaf filter is widely selected for filtering by manufacturers at present, and has the advantages of stable performance of the plate and frame filter, closed continuous production, large treatment capacity and good economic benefit. Compared with a plate-frame filter, the vertical leaf filter has the advantages of compact structure, small occupied area, mechanical automatic deslagging, cleanness, sanitation, small pollution, full-automatic operation, continuous closed production realized by two parallel and alternate use, great reduction of labor intensity of workers and field management optimization.
The working process of the vertical leaf filter is generally automatically controlled by a computer, and each cycle comprises the following stages:
(1) In the feeding stage, the solid-liquid mixture is fed into the filter body, and when the overflow port has liquid flow, the filter body of the vertical leaf filter is filled with filtrate, and the overflow port can be closed to enter the filter screen cake hanging stage.
(2) And in the cake hanging stage, filtrate passes through the filter screen, the filtrate passing through the filter screen is turbid liquid, the filtrate is returned to the filtrate to be filtered, and after the turbid liquid becomes clear, the reflux channel is closed to enter a normal filtering stage. This stage typically takes around 30 minutes.
(3) The normal filtering stage usually takes about 2-4 hours, and when the pressure of the tank body reaches a specified limit value, the filtering should be stopped, and the thickness of the filter cake on the filter screen reaches the limit value and can not be filtered.
(4) And in the deslagging stage, the valve acts more, the auxiliary working time is shortened, the filter tank is emptied, the filter cake is dried, the filter cake is removed, and the valve is closed after the filter cake is discharged, so that the filter cake is ready for the next filtration.
The grease decoloring process using the vertical blade filter is simple, as shown in fig. 1, after the oil to be decolored passes through the clay mixer, the oil enters a decoloring tower to be decolored, after the decoloring is finished, the oil-soil mixture is pumped into the filter for filtering, and then the refined filter is used for fine filtering and flows into an oil storage tank.
However, the main component of the grease is triglyceride, and pure triglyceride is colorless in liquid state and white in solid state. However, the common grease has different colors, which is because the grease contains different pigments with different amounts and varieties, most pigments are nontoxic, but the appearance of the grease is affected. Therefore, to produce higher grade grease products such as national standard first grade oil, margarine stock oil, and certain cosmetic stock oils, etc., the grease must be decolorized. The most widely used method for decoloring oil is adsorption decoloring method as shown in the process of fig. 1, however, the filtering machine generally has no problem when filtering crude oil, but when decoloring oil and filtering clay, the clay has the characteristics of: the clay particles are tiny, the viscosity of the oil-containing clay is very high, so that problems are easy to occur in operation, the most obvious disadvantage is that the cake hanging time is too long, the operation strength and difficulty of equipment are increased, meanwhile, as the filtering time is prolonged, the filter cake on the filter screen is compact, the filtering channel is tiny, the normal filtering time is reduced, and therefore, the decoloring efficiency of grease is very low.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing an improved grease decoloring system containing a vertical blade filter, which can form a filter cake layer on a filter screen of the vertical blade filter while a decoloring tower is in decoloring state, so that the oil-soil mixture discharged from the decoloring tower directly completes the filtration of high-quality grease under the cooperation of the filter cake layer and the filter screen, thereby greatly shortening the time of grease decoloring treatment and improving the decoloring efficiency and the processing capacity of the decoloring system.
Meanwhile, the invention also provides a grease decoloring process containing the vertical leaf filter, which can greatly shorten the decoloring time and ensure the quality of filtered oil.
In order to solve the technical problems, the invention adopts the following technical scheme:
a grease decoloring system comprising a vertical leaf filter comprising: the clay mixing unit comprises a first clay mixer and a clay adding device which are communicated with a pipeline of the oil to be decolorized;
a decolorization tower communicated with the first clay mixer;
a vertical leaf filter which is communicated with the decoloring tower and is used for solid-liquid separation of the oil-soil mixture;
the pretreatment unit is used for carrying out filtering pretreatment on the vertical leaf filter and comprises a second clay mixer communicated with the vertical leaf filter, a circulating assembly for circulating oil pre-filtered by the vertical leaf filter to the second clay mixer, and a detection device which is arranged on an oil outlet pipeline of the vertical leaf filter and used for carrying out on-line detection on the color and/or the soil content of the oil, wherein when the detection result of the detection device meets the decolorization requirement, a cake hanging is formed on a filter screen of the vertical leaf filter, the circulating assembly stops working, and an oil-soil mixture in the decolorization tower enters the vertical leaf filter formed with the cake hanging for filtering.
Preferably, the second clay mixer is also in communication with the decolorizing column. After cake hanging is formed by the vertical blade filter, the second clay mixer can be communicated with the decoloring tower, so that the oil-soil mixture is further decolored in the decoloring tower. Greatly improves the grease decoloring efficiency.
According to a specific implementation and preferred aspect of the present invention, a vertical leaf filter comprises a tank arranged vertically and having a feed inlet, a discharge outlet and a slag discharge outlet; the vertical filter blade that sets up in the jar body, and wherein the jar body includes jar body, cover and tank bottoms, filter blade sets up on the lateral wall of jar body from both sides portion detachably.
Preferably, the horizontal section of the tank body is circular, the filter blades are provided with a plurality of groups, and the filter blades are sequentially and alternately distributed in the circular along the extending direction of the same diameter of the circular.
Further, each group of filter blades comprises a rectangular filter frame and filter screens positioned on two opposite sides of the filter frame, wherein filter cavities are formed in the filter screens and the filter frames, and the vertical blade filter further comprises an oil collecting pipeline for communicating the filter cavities with each other from the filter frames, an oil outlet pipeline for communicating the oil collecting pipeline with a discharge port and an oil storage tank.
Specifically, the filter frame is a hollow pipeline, communicating pipes which are used for communicating the inner cavities of the plurality of hollow pipelines are further arranged among the plurality of hollow pipelines, wherein through holes are formed in the inner wall of each hollow pipeline forming the filter cavity, and filtered oil can flow in the hollow pipeline from the through holes and flow to the oil collecting pipeline. Greatly improves the filtering efficiency.
Preferably, the filter frames of the groups of filter blades are equal in height and uniformly spaced.
According to a further specific and preferred aspect of the present invention, the vertical vane filter further comprises a bracket detachably provided inside the tank body, and a vibrator provided outside the bracket, wherein the filter vane is detachably connected to the bracket from upper and lower ends, an output end of the vibrator is communicated with the bracket, and when cleaning, vibration of the vibrator is transmitted to the bracket, and the filter vane vibrates accordingly to make the cake fall off.
Preferably, the tank cover is detachably arranged at the opening part of the tank body, and the tank bottom is tapered with gradually smaller outer diameter from top to bottom.
In addition, the slag discharging port is positioned at the bottom of the tank bottom, the feeding port is positioned at the side part of the tank bottom, and two slag discharging ports are arranged; the feeding hole is positioned at the side part of the tank body, and the overflow hole is further formed in the side part of the tank body above the feeding hole.
The working process of the vertical leaf filter is as follows: pumping the oil-soil mixture into a tank body, allowing filtrate to pass through filter surfaces on two sides of a blade to enter a blade filter cavity under the action of pressure, allowing partial small particles smaller than the holes of a filter screen to pass through the filter screen at the initial stage of filtration to enter filtrate, allowing undesirable filtrate to return to the filtrate to form a closed cycle, allowing solid impurities in the filtrate to be gradually trapped on the filter screen to form a filter cake, allowing the filter cake to be clear and qualified at a liquid outlet until a stable and effective filter cake is established on the filter screen, allowing the vertical blade filter to complete the pretreatment of filtration, pumping the oil-soil mixture discharged from a decolorizing tower into the tank body, allowing decolorized oil to flow to an oil storage tank under the action of the filter cake and the filter screen, and allowing the vertical blade filter to enter an effective filtration stage; however, along with the extension of the filtering time, the amount of filter cakes accumulated on the filter screen is gradually increased, after a certain amount of filter cakes are reached, the effective filtering stage is ended, the compressed air is used for discharging the filter cakes to be filtered in the filter tank, the residual liquid in the filter cakes is dried by steam (or compressed air), the butterfly valve at the bottom of the tank body is opened, the vibrator is started to drive the filter screen to vibrate so as to shake the filter cakes of the filter screen, and the filter cakes are discharged out of the tank body. And after the filter cake is discharged, the butterfly valve is closed, so that preparation is made for the next filtration.
The other technical scheme of the invention is as follows: the grease decoloring process with the vertical leaf filter adopts the grease decoloring system to perform grease decoloring treatment, and comprises the following specific steps:
1) Oil to be decolorized is pumped to a first clay mixer after being heated, clay added to the first clay mixer by a clay adding device is mixed and then sent to a decolorizing tower;
2) Heating oil to be decolorized in a decolorizing tower, pumping the heated oil to a second clay mixer, adding clay of the second clay mixer by a clay adding device for mixing, then conveying the clay mixture to a vertical blade filter for filtering, returning the filtered oil to the second clay mixer, and circulating the process until the result measured by a detecting device meets the decolorizing requirement, and stopping circulating until a filter cake layer is formed on a filter screen of the vertical blade filter;
3) And opening an oil discharge channel of the decolorizing tower, filtering the oil-soil mixture in a vertical blade filter with a filter cake layer, and flowing the filtered oil into an oil storage tank.
Preferably, in step 3), as the filtration time is prolonged, the filter cake layer accumulated on the filter screen is thickened gradually, and when the oil outlet speed of the vertical blade filter is slowed, the filtration is stopped, then the residual liquid in the filter cake is dried by using the compressed air, then the filter cake is vibrated by opening the butterfly valve at the bottom, the vibrator drives the filter screen to vibrate and the filter cake layer of the filter screen is vibrated, and then the vertical blade filter is discharged, and then the circulation process in step 2) is repeated, the filter cake layer is reformed, and then the next filtration is performed.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
the invention can form a filter cake layer on the filter screen of the vertical blade filter while the decolorizing tower is in decolorizing, so that the oil-soil mixture discharged from the decolorizing tower directly filters high-quality grease under the cooperation of the filter cake layer and the filter screen, thereby greatly shortening the time of grease decolorizing treatment and improving the decolorizing efficiency and the treating capacity of a decolorizing system.
Drawings
The invention will now be described in further detail with reference to the drawings and to specific examples.
FIG. 1 is a schematic diagram of a grease decolorization process in the prior art;
FIG. 2 is a schematic diagram of the oil decolorization system of the present invention;
FIG. 3 is a schematic view of a partial structure of a vertical vane filter of the present invention;
FIG. 4 is an enlarged schematic cross-sectional view of one of the filter vanes of FIG. 3;
FIG. 5 is a schematic diagram of the grease decoloring process according to the present invention;
wherein: 1. clay mixing unit; 10. a first clay mixer; 11. clay adding device; 2. a decoloring tower; 3. vertical leaf filter; 30. a tank body; 30a, can body; 30b, can lid; 30c, tank bottom; a. a feed inlet; b. a discharge port; c. a slag outlet; d. an overflow port; 31. a filter blade; 310. a filter frame; 311. a filter screen; q, through holes; 32. an oil collecting pipeline; 33. a bracket; 34. a vibrator; 35. an oil storage tank; 4. a preprocessing unit; 40. a second clay mixer; 41. a circulation assembly; 42. a detection device; B. a cake layer (cake hanging); x, oil to be decolorized.
Detailed Description
Referring to fig. 2, the fat decolorizing system including a vertical leaf filter according to the present embodiment includes a clay mixing unit 1, a decolorizing tower 2, a vertical leaf filter 3, and a pretreatment unit 4 for pretreating the vertical leaf filter 3 to form a cake (or cake layer). Specifically, the clay mixing unit 1 comprises a first clay mixer 10 and a clay adding device 11 which are communicated with a pipeline of oil X to be decolorized, wherein the first clay mixer 10 is communicated with a decolorizing tower 2, and the decolorizing tower 2 is communicated with a vertical blade filter 3.
A vertical blade filter 3 for solid-liquid separation of the oil-soil mixture.
The pretreatment unit 4 comprises a second clay mixer 40 communicated with the vertical leaf filter 3, a circulating component 41 for circulating the oil pre-filtered by the vertical leaf filter 3 to the second clay mixer 40, and a detection device 42 which is arranged on an oil outlet pipeline of the vertical leaf filter 3 and is used for detecting the color and/or the soil content of the oil on line, wherein when the detection result of the detection device 42 meets the decolorizing requirement, a cake (filter cake layer) B is formed on a filter screen of the vertical leaf filter 3, the circulating component 41 stops working, and the oil-soil mixture in the decolorizing tower 2 enters the vertical leaf filter 3 formed with the cake to be filtered, namely, the cake forming process is completed.
In general, the detection device 42 may observe whether the filtered oil is clear or not, and it is needless to say that the quality of the filtered oil may be determined by analyzing the soil content of the oil by automatic sampling. Meanwhile, the detecting device 42 belongs to common equipment for monitoring oil quality, and can be directly purchased externally, and detailed description thereof is omitted.
The circulation assembly 41 mainly includes a circulation pump and a circulation line.
Meanwhile, a second clay mixer 40 is also provided in communication with the decolorizing column 2. That is, after cake formation by the vertical leaf filter 3, the second clay mixer 40 may be connected to the decolorizing column so that the clay mixture is further decolorized in the decolorizing column 2. Greatly improves the grease decoloring efficiency.
Referring to fig. 3, the vertical vane filter 3 includes a tank 30 vertically provided and having a feed port a, a discharge port b, and a slag discharge port c; filter blades 31 are vertically provided in the can 30, wherein the can 30 includes a can body 30a, a can lid 30b and a can bottom 30c, and the filter blades 31 are detachably provided on the side walls of the can body 30a from both side portions.
In this example, the can body 30a is cylindrical, the can bottom 30c is tapered with an outer diameter gradually decreasing from top to bottom, and the can lid 30b is detachably provided at the mouth of the can body 30 a.
Specifically, the horizontal cross section of the can body 30a is circular, and the filter blades 31 have a plurality of groups and are sequentially and alternately distributed inside the circular shape along the extending direction of the same diameter of the circular shape.
As shown in fig. 4, each set of filter blades 31 includes a rectangular filter frame 310, filter screens 311 positioned at opposite sides of the filter frame 310, wherein the filter screens 311 and the inside of the filter frame 310 form filter chambers, the vertical blade filter further includes an oil collecting pipe 32 for connecting the filter chambers to each other from the filter frame 310, an oil outlet pipe (not shown but not easily understood) for connecting the oil collecting pipe 32 to the discharge port b, and an oil storage tank 35.
In this example, the filter frame 310 is a hollow pipe, and a communicating pipe for communicating the inner cavities of the hollow pipes is further disposed between the hollow pipes, wherein a through hole q is formed on the inner wall of each hollow pipe forming the filter cavity, and the filtered oil can flow in the hollow pipe from the through hole q and flow to the oil collecting pipeline 32. Greatly improves the filtering efficiency.
In this example, the filter frames of the plurality of sets of filter blades 31 are equal in height and uniformly spaced.
The vertical vane filter 3 further comprises a bracket 33 detachably arranged in the tank body 30a and a vibrator 34 arranged outside the bracket 33, wherein the filter vane 31 is detachably connected to the bracket 33 from the upper end and the lower end, the output end of the vibrator 34 is communicated with the bracket 33, when cleaning, the vibration of the vibrator 34 is transmitted to the bracket 33, and the filter vane 31 vibrates along with the bracket to enable the hanging cake to fall off.
In addition, a slag discharging port c is positioned at the bottom of the tank bottom 30c, and two feeding ports a are positioned at the side part of the tank bottom 30 c; the feed inlet a is positioned at the side part of the tank body 30a, and an overflow port d is further arranged at the side part of the tank body 30a above the feed inlet, wherein the overflow port d is arranged, so that when the vertical blade filter 3 passes through the feed inlet d in the feed stage, the overflow port d indicates that the vertical blade filter 3 is full of filtrate, and the overflow port can be closed to enter the filter screen cake hanging stage.
In this example, the working process of the vertical leaf filter is: pumping the oil-soil mixture into a tank body, allowing filtrate to pass through filter surfaces on two sides of a blade to enter a blade filter cavity under the action of pressure, allowing partial small particles smaller than the holes of a filter screen to pass through the filter screen at the initial stage of filtration to enter filtrate, allowing undesirable filtrate to return to the filtrate to form a closed cycle, allowing solid impurities in the filtrate to be gradually trapped on the filter screen to form a filter cake layer, allowing the filter cake layer to be obtained at a liquid outlet after a stable and effective filter cake is established on the filter screen, allowing the vertical blade filter to complete pretreatment of filtration, pumping the oil-soil mixture discharged from a decolorizing tower into the tank body, allowing decolorized oil to flow to an oil storage tank under the action of the filter cake and the filter screen, and allowing the vertical blade filter to enter an effective filtration stage; however, along with the extension of the filtering time, the amount of filter cakes accumulated on the filter screen is gradually increased, after a certain amount of filter cakes are reached, the effective filtering stage is ended, the compressed air is used for discharging the filter cakes to be filtered in the filter tank, the residual liquid in the filter cakes is dried by steam (or compressed air), the butterfly valve at the bottom of the tank body is opened, the vibrator is started to drive the filter screen to vibrate so as to shake the filter cakes of the filter screen, and the filter cakes are discharged out of the tank body. And after the filter cake is discharged, the butterfly valve is closed, so that preparation is made for the next filtration.
Meanwhile, in order to further ensure the filtering effect, a fine filter can be arranged between the vertical leaf filter and the oil storage tank.
The decoloring process (see fig. 5):
after the decolorized oil is heated by a heater, pumping the decolorized oil into a clay mixer 1, mixing the decolorized oil with clay added by a clay adding device (clay adding device), pumping the oil-clay mixed solution into a decolorization tower after the decolorization tower is fully mixed, and adsorbing substances such as pigment in the oil by clay under the stirring action in the decolorization tower; simultaneously, the other part of the heated oil to be decolorized is pumped into a clay mixer 2 and mixed with clay added by a clay adding device (clay adder), the clay concentration is greatly increased in the oil-clay mixed liquid formed in the clay mixer 2, the clay concentration of the oil-clay mixed liquid corresponding to a decolorization tower is greatly increased, the high-concentration oil-clay mixed liquid fully mixed in the clay mixer 2 is pumped into a vertical blade filter to finish the operation of a feeding stage and a cake hanging stage of the vertical blade filter, the reflux of the cyclic operation of the cake hanging stage returns to the clay mixer 2, the cake hanging is finished, a stable filter layer is formed by a filter screen, the normal filtering stage can be entered, at the moment, a channel of the clay mixer 2 for feeding oil to the vertical blade filter is closed, the oil feeding channel of the decolorization tower to the vertical blade filter is opened, the decolorized mixed liquid is filtered, and the filtered oil is finely filtered by a safety filter (fine filter) after being cooled, so that the decolorized oil is obtained.
In the process, the vertical leaf filter is subjected to periodic operation in four stages like the original decoloring process, the feeding stage, the filtering stage and the deslagging stage are basically unchanged, the most obvious change is the cake hanging stage, the original process is that the oil-clay mixed liquid of the decoloring tower is input into the vertical leaf filter for cake hanging, the clay concentration is low, the cake hanging time is long, the special equipment is changed into the special equipment to supply the high-concentration oil-clay mixed liquid to the vertical leaf filter for circulation, the cake hanging speed is greatly accelerated, the cake hanging time is reduced by more than half, the oil flow channel of a filter cake layer on the filter screen is loose and smooth along with the great shortening of the cake hanging time, the oil is easy to pass through, the clay is blocked by the filter cake layer, and thus the normal filtering time is prolonged, therefore, the filter screen is required to be cleaned, the filter cake is particularly dried by using compressed air, the butterfly valve at the bottom of a tank body is opened after the residual liquid is dried, the filter screen is driven by a vibrator to vibrate by starting the vibrator to vibrate the filter screen, the filter cake is discharged, the tank body is closed, and the filter cake is ready for next filtering.
Therefore, along with shortening cake hanging time, the operation intensity and difficulty of equipment are reduced, and meanwhile, because the decolorization of the decolorization tower and the feeding of the vertical blade filter are simultaneously carried out, the original technology is to decolorize firstly and then feed the cake hanging, so that after the system of the application is adopted, the time of a technological process is obviously shortened, and the processing capacity of the equipment is improved.
The present invention has been described in detail with the purpose of enabling those skilled in the art to understand and practice the present invention, but not to limit the scope of the present invention, and the present invention is not limited to the above-described embodiments, and all equivalent changes or modifications according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (10)
1. A grease decoloring system comprising a vertical leaf filter comprising: the clay mixing unit comprises a first clay mixer and a clay adding device which are communicated with a pipeline of the oil to be decolorized;
a decolorization tower in communication with the first clay mixer;
a vertical leaf filter which is communicated with the decoloring tower and is used for solid-liquid separation of the oil-soil mixture;
the method is characterized in that: the grease decoloring system also comprises a preprocessing unit for filtering and preprocessing the vertical leaf filter to form a cake, wherein the preprocessing unit comprises a second clay mixer communicated with the vertical leaf filter, a circulating assembly for circulating oil prefiltered by the vertical leaf filter to the second clay mixer, and a detection device which is arranged on an oil outlet pipeline of the vertical leaf filter and used for detecting the color and/or the soil content of the oil on line, wherein when the detected result of the detection device meets the decoloring requirement, the cake is formed on a filter screen of the vertical leaf filter, the circulating assembly stops working, and an oil-soil mixture in the decoloring tower enters the vertical leaf filter formed with the cake for filtering.
2. The fat decolorization system with vertical leaf filter according to claim 1, wherein: the second clay mixer is also communicated with the decoloring tower.
3. The fat decolorization system with vertical leaf filter according to claim 1, wherein: the vertical blade filter comprises a tank body which is vertically arranged and provided with a feed inlet, a discharge outlet and a slag discharge outlet; the vertical setting is in the internal filter leaf of jar, wherein the jar body includes jar body, cover and tank bottoms, filter leaf sets up from both sides portion detachably on the lateral wall of jar body.
4. A grease decoloring system comprising a vertical leaf filter according to claim 3 wherein: the horizontal cross section of the tank body is circular, the filter blades are provided with a plurality of groups, and the filter blades are sequentially and uniformly distributed in the circular along the extending direction of the same diameter of the circular shape at intervals.
5. The fat decolorizing system comprising a vertical leaf filter of claim 4 wherein: each group of filter blades comprises a rectangular filter frame and filter screens positioned on two opposite sides of the filter frame, wherein filter cavities are formed in the filter screens and the filter frames, and the vertical blade filter further comprises an oil collecting pipeline, an oil outlet pipeline and an oil storage tank, wherein the oil collecting pipeline is used for mutually communicating a plurality of filter cavities with the filter frames, and the oil outlet pipeline is used for communicating the oil collecting pipeline with the discharge port.
6. The fat decolorizing system comprising a vertical leaf filter of claim 5 wherein: the filter frame is a hollow pipeline, a plurality of communicating pipes which are used for communicating the inner cavities of the hollow pipelines are further arranged among the hollow pipelines, wherein through holes are formed in the inner wall of each hollow pipeline which forms the filter cavity, and filtered oil can flow from the through holes to the oil collecting pipeline in the hollow pipelines.
7. A grease decoloring system comprising a vertical leaf filter according to claim 3 wherein: the vertical blade filter also comprises a support which is detachably arranged in the tank body and a vibrator which is arranged outside the support, wherein the filter blade is detachably connected to the support from the upper end part and the lower end part, the output end part of the vibrator is communicated with the support, when the filter blade is clean, the filter blade is driven to the support by the vibration of the vibrator, and the filter blade vibrates along with the support so that the hanging cake falls off.
8. A grease decoloring system comprising a vertical leaf filter according to claim 3 wherein: the slag discharging port is positioned at the bottom of the tank bottom, and the feeding ports are positioned at the side parts of the tank bottom and are two; the feeding hole is positioned at the side part of the tank body, and the overflow hole is further formed in the side part of the tank body above the feeding hole.
9. A grease decoloring process containing a vertical leaf filter is characterized in that: the process adopts the grease decoloring system as set forth in any one of claims 1 to 8 for grease decoloring treatment, and comprises the following specific steps:
1) Oil to be decolorized is pumped to a first clay mixer after being heated, clay added to the first clay mixer by a clay adding device is mixed and then sent to a decolorizing tower;
2) Heating oil to be decolorized in a decolorizing tower, pumping the heated oil to a second clay mixer, adding clay of the second clay mixer by a clay adding device for mixing, then conveying the clay mixture to a vertical blade filter for filtering, returning the filtered oil to the second clay mixer, and circulating the process until the result measured by a detecting device meets the decolorizing requirement, and stopping circulating until a filter cake layer is formed on a filter screen of the vertical blade filter;
3) And opening an oil discharge channel of the decolorizing tower, filtering the oil-soil mixture in a vertical blade filter with a filter cake layer, and flowing the filtered oil into an oil storage tank.
10. The process for decoloring oils and fats containing a vertical leaf filter according to claim 9, wherein: in the step 3), along with the extension of the filtering time, the filter cake layer accumulated on the filter screen gradually becomes thicker, and when the oil outlet speed of the vertical blade filter is slow, the filtering is stopped, then the compressed air is used for discharging the filtrate to be filtered in the vertical blade filter, then the residual liquid in the filter cake is dried by steam, the butterfly valve at the bottom is opened, the vibrator is started to drive the filter screen to vibrate and fall the filter cake layer of the filter screen, and the vertical blade filter is discharged, then the circulating process in the step 2) is repeated, the filter cake layer is formed again, and then the next filtering is performed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910253480.5A CN109810776B (en) | 2019-03-29 | 2019-03-29 | Grease decoloring system and process containing vertical leaf filter |
| CN202311803969.8A CN117821159A (en) | 2019-03-29 | 2019-03-29 | Grease decoloring technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910253480.5A CN109810776B (en) | 2019-03-29 | 2019-03-29 | Grease decoloring system and process containing vertical leaf filter |
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| CN201910253480.5A Active CN109810776B (en) | 2019-03-29 | 2019-03-29 | Grease decoloring system and process containing vertical leaf filter |
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| CN115651759A (en) * | 2022-11-07 | 2023-01-31 | 山东凯斯达机械制造有限公司 | Automatic filtering system for grease decoloring and use method thereof |
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| CN117821159A (en) | 2024-04-05 |
| CN109810776A (en) | 2019-05-28 |
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