CN114832476B - Residual filter cake removing equipment and system with air blowing effect - Google Patents
Residual filter cake removing equipment and system with air blowing effect Download PDFInfo
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- CN114832476B CN114832476B CN202210260181.6A CN202210260181A CN114832476B CN 114832476 B CN114832476 B CN 114832476B CN 202210260181 A CN202210260181 A CN 202210260181A CN 114832476 B CN114832476 B CN 114832476B
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- 238000007664 blowing Methods 0.000 title claims abstract description 68
- 230000000694 effects Effects 0.000 title claims abstract description 30
- 238000007790 scraping Methods 0.000 claims abstract description 41
- 238000000926 separation method Methods 0.000 claims abstract description 17
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 5
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
- B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
- B01D29/6446—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles with a rotary movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
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Abstract
The invention belongs to the technical field of residual filter cake treatment, and particularly relates to residual filter cake removal equipment and system with an air blowing effect. The invention comprises a separation kettle and a scraping assembly, wherein the scraping assembly comprises a rotary shaft coaxially arranged in the separation kettle, a scraping knife rest is arranged at the bottom of the rotary shaft, and a blade is arranged on the scraping knife rest; the scraping assembly further comprises a knife back nozzle arranged at the scraping knife rest, the air flow spraying direction of the knife back nozzle points to the back surface of the blade, and the shape of the back surface of the blade is a cambered surface shape which is convenient for air flow to flow along the wall surface, so that the air flow finally flows to the blade edge; the invention also comprises a back-blowing assembly, wherein the back-blowing assembly comprises a back-blowing air pipe positioned below the filter disc, a back-blowing nozzle is arranged on the back-blowing air pipe, and the air flow jet direction of the back-blowing nozzle points to the direction of the filter disc from bottom to top. The invention can well complete the purging and cleaning purposes of the residual filter cake, has high filter cake removal rate, remarkably improves the filtration efficiency and correspondingly prolongs the cycle period of the filtration medium.
Description
Technical Field
The invention belongs to the technical field of residual filter cake treatment, and particularly relates to residual filter cake removal equipment and system with an air blowing effect.
Background
Filtration is one of the most common and effective chemical unit operations for separating liquid/solid heterogeneous mixtures, and is in the form of air press filtration, vacuum filtration, mechanical extrusion, etc. in industrial production. During filtration, the liquid in the mixture passes through the meshes of the filter medium, and the solid materials in the mixture are trapped on the surfaces of the filter medium such as filter cloth, a metal filter screen or a filter element, so that the purpose of solid-liquid separation is achieved. In the filtering operation, as the filtering process is carried out, the thickness of the solid particle layer, namely the filter cake, is continuously increased, so that the filtering resistance is continuously increased, and the filtering rate is continuously reduced, therefore, the thickness of the filter cake is one of key factors influencing the filtering rate. In the production, the filter equipment can achieve the purpose of removing filter cakes through various structural modes, such as a scraper/scraping plate structure, a vibrating structure, a filter bag overturning structure, a flushing structure and the like; the filter cake discharging mode of the filter equipment with wider application range, such as a multifunctional filter washing drying integrated machine, a flat plate type scraper lower discharging centrifugal machine and the like, is scraper discharging, namely the scraper scrapes and discharges the filter cake layer by rotating and penetrating. In order to protect the filter medium from being scratched, a gap of about 10mm is finally formed between the scraper and the filter medium, and the filter cake remained in the gap is a residual filter cake and cannot be removed by the scraper. According to the above, the residual filter cake can reduce the next filtration rate, and can also cause cross-use and mixing between each batch of materials, and the residual filter cake has to be removed by manual cleaning in production practice. In the filtering equipment with larger specification and model, the residual filter cake reaches hundreds of kilograms, which not only greatly reduces the production efficiency, but also has larger labor intensity; if the materials are toxic or flammable and explosive, certain potential safety hazards are also provided for manual removal, and the problem needs to be solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides residual filter cake removing equipment which is compact in structure, convenient and reliable to use and has an air blowing effect.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the residual filter cake removing device with the air blowing effect comprises a separating kettle with a scraping component, wherein the scraping component comprises a rotating shaft coaxially arranged in the separating kettle, the top of the rotating shaft penetrates through a kettle cover of the separating kettle and is connected with a power source, a scraping knife rest is arranged at the bottom of the rotating shaft, which is positioned in a kettle cavity of the separating kettle, and a blade for scraping materials is arranged above a filter disc; the method is characterized in that:
the scraping assembly further comprises a knife back nozzle arranged at the scraper rest, the air flow spraying direction of the knife back nozzle points to the back surface of the blade, and the shape of the back surface of the blade is a cambered surface shape which is convenient for air flow to flow along the wall surface, so that the air flow finally flows to the blade edge;
the device also comprises a back-blowing assembly, wherein the back-blowing assembly comprises a back-blowing air pipe positioned below the filter disc, back-blowing nozzles are arranged on the back-blowing air pipe, and the air flow jet direction of the back-blowing nozzles points to the direction of the filter disc from bottom to top.
Preferably, the blade is arc tile-shaped, and the arc opening of the blade faces to the advancing direction of the blade; the curvature k=0.015 to 0.03 of the blade.
Preferably, the scraper rest and the rotary shaft are provided with hollow sealing cavities which are communicated with each other, so that the cavities of the scraper rest form a connecting cavity which is communicated with the inner cavity of the rotary shaft and the nozzle spraying cavity of the knife back; the air source is communicated with the inner cavity of the rotary shaft through a rotary joint positioned at the top end of the rotary shaft until the air flow is conveyed to the position of the knife back nozzle.
Preferably, the shape of the scraper frame is a regular triangular table with thin top and thick bottom, the bottom surface of the scraper frame is fixed at the rotary shaft, the blade is arranged at the front side plate of the scraper frame, the blade back nozzle is arranged at the lower side plate of the scraper frame, and the height of the front edge formed by the cooperation of the front side plate and the lower side plate is lower than that of the rear edge formed by the cooperation of the rear side plate and the lower side plate.
Preferably, the number of the scraping knife rest is two, and the scraping knife rest is circumferentially and uniformly distributed along the axis of the rotary shaft; the blades are more than two groups and are sequentially arranged along the length direction of the corresponding scraper rest, and the advancing paths of all the blades are matched with each other to form a circular cleaning surface which is matched with the shape of the filter cake.
Preferably, bottom nozzles communicated with the inner cavity of the rotary shaft are arranged on the bottom surface of the rotary shaft, and the bottom nozzles are more than two groups and are axially symmetrically arranged relative to the axis of the rotary shaft; in a plan view parallel to the axis of the rotary shaft, the bottom nozzles are formed in a scroll-like arrangement, and the injection direction of the bottom nozzles is directed in the direction of rotation of the rotary shaft.
Preferably, the bottom nozzle and the knife back nozzle are both high-pressure fan-shaped nozzles.
Preferably, the back-blowing air pipe comprises an inner collecting pipe and an outer collecting pipe, wherein the inner collecting pipe and the outer collecting pipe are arranged in concentric rings, the inner collecting pipe and the outer collecting pipe are arranged on the same plane, and the inner collecting pipe and the outer collecting pipe are connected with each other through connecting pipes extending in the radial direction; the blowback nozzles are uniformly distributed on the upper ring surface of the inner collecting pipe and the outer collecting pipe.
Preferably, the filter disc comprises filter media which are arranged in a stacked manner from top to bottom and an orifice plate for fixing the filter media in a partitioning manner, and a supporting frame with a rigidity reinforcing effect is arranged on the bottom surface of the orifice plate.
Preferably, a system using said residual cake removal device is characterized in that: the system also comprises an air supply pipeline for supplying air to the scraping component and the back blowing component, wherein the air supply pipeline comprises an air source, and the air source is divided into a high-pressure branch and a low-pressure branch after passing through an air source triple piece; the high-pressure branch is communicated with the inner cavity of the rotary shaft after passing through the overflow pressure reducing valve RV1, the pressure gauge P1, the adjustable one-way throttle valve TV1 and the electromagnetic valve MGV1 in sequence, and the low-pressure branch is communicated with the back-blowing air pipe after passing through the overflow pressure reducing valve RV2, the pressure gauge P2, the adjustable one-way throttle valve TV2 and the electromagnetic valve MGV2 in sequence.
The invention has the beneficial effects that:
1) The invention can well complete the purging and cleaning of the residual filter cake by means of the cooperation of the upper air flow prying and sweeping and the lower interlocking pulse air flow back blowing; the filter cake removal rate is up to more than 80%, the filtering efficiency is improved, and the cycle period of the filtering medium is prolonged.
Specifically, on one hand, the scraper component is arranged above the filter disc, and the blade on the scraper component is matched with the blade back nozzle to realize the function of redirecting and advancing the airflow at the blade back nozzle, so that the high-pressure airflow is finally sprayed to the cutting edge area along the arc-shaped blade back, and an air blowing blade structure is formed. The high-pressure air flow redirected to the cutting edge of the blade can compensate and act on the matching gap between the cutting edge of the blade and the filter plate, so that vortex-shaped air flow force of prying upwards is generated on the residual filter cake at the matching gap, and the purpose of prying up the residual filter cake is achieved. On the other hand, a series of back-blowing nozzles are arranged below the filter disc, namely on the back surface of the residual filter cake, and the residual filter cake is blown through interlocking pulse air flow to loosen the hardening condition of the residual filter cake. So far, through the upper prying and lower blowing structure, the sweeping and discharging functions of the whole residual filter cake surface can be completed under the action of high-pressure airflow and even the rotary shoveling action of the blade per se along with the rotary action of the rotary shaft and the scraper rest.
2) As a preferable scheme of the scheme, the blade can utilize high-pressure gas to meet an arc-shaped blade back with a certain curvature so as to generate a wall attaching effect, achieve the function of changing the airflow direction, finally give out air along the lower surface of the blade edge, generate an 'prying-up' vortex airflow force on the residual filter cake from the surface to the inner layer, and pry the residual filter cake layer by layer. Based on the above description, the blade of the present invention may be an arc-shaped blade with a certain curvature as a whole, so as to improve the convenience of use and processing.
3) In practical use, the blade of the present invention may be independently mounted on a certain side shaft or may be directly mounted on a stirring shaft as a rotation shaft. During actual assembly, the air source can pass through the inner cavity of the rotating shaft and the scraper overhead cavity to the position of the knife back nozzle due to the actual requirement of the knife back nozzle on high-pressure air flow, so that the high-pressure air flow running function is realized. Meanwhile, due to the special regular triangular platform structure of the scraper frame, when the scraper frame rotates, the part close to the center of the rotating shaft can be contacted with the material first, and the part far away from the center of the rotating shaft is contacted with the material later, so that the effect of pushing the material outwards from the center is achieved. On the other hand, the front edge height formed by the cooperation of the front side plate and the lower side plate of the scraper rest is lower than the rear edge height formed by the cooperation of the rear side plate and the lower side plate, so that the front inclined layout can be naturally formed when the blade is installed, the scraping function of the blade is ensured, and meanwhile, the back nozzle can be sprayed to the back of the blade at a proper angle after the blade is installed, thereby realizing the wall-along flow effect of high-pressure air flow, and achieving multiple purposes.
4) When the blades are used, the blades are set to be left and right complementary, the back of each blade is provided with a high-pressure gas nozzle to form a plurality of gas blowing surfaces, and the blowing and discharging of the whole residual filter cake surface are completed through left and right complementary, so that the blowing reaction force of the integral structure is reduced.
5) In order to protect filter media in the filter disc and ensure reliable loosening effect on residual filter cakes, and further to ensure that the back-flushing air flow at the back-flushing assembly is generally in pulse operation, the back-flushing period can be set according to the hardening condition of materials, the thickness of residual filter cakes and the like. The cooperation between the forward blowing and the backward blowing can be set by an automatic program and can be freely combined so as to adapt to different materials and different working conditions and obtain the best effect.
Drawings
FIG. 1 is an assembled state diagram of the present invention;
FIG. 2 is a schematic view of a scraping assembly;
FIG. 3 is a schematic bottom view of FIG. 2;
FIG. 4 is a schematic view of the blade in operation;
fig. 5 is an arrangement state diagram of the blowback assembly.
The actual correspondence between each label and the component name of the invention is as follows:
a-residual cake
10-scraping component 11-rotating shaft 12-scraper frame
12 a-front side plate 12 b-lower side plate 12 c-rear side plate
13-blade 14-back of blade nozzle 15-bottom nozzle
20-separation kettle 21-filter disc
30-blowback assembly
31-inner header 32-outer header 33-connecting pipe 34-blowback nozzle
40-air source 50-air source triplet
61-high pressure branch 62-low pressure branch
Detailed Description
For ease of understanding, the specific structure and operation of the present invention will be further described herein with reference to FIGS. 1-5:
typically, to protect the filter media from damage by the scraping mechanism, a gap, typically 10mm, is left between the blade of the scraping mechanism and the filter media; the gap of the separation kettle with high technical parameters is larger. Therefore, the residual cake a in the gap is deposited on the surface of the filter medium in the separation vessel more uniformly, and needs to be removed by other means. Based on the above, the invention adopts a mode of combining forward blowing and reverse blowing as shown in fig. 1-2 to realize the function of quickly purging and removing the residual filter cake A.
In actual design, if the residual filter cake A shown in the figure 4 is directly purged by adopting high-pressure gas, the effect is poor; the main reason is that the residual filter cake A is the bottommost layer of the filter cake, the compression is larger, and the filter cake is in a harder state. The high pressure gas directly sweeps the filter cake surface, instead compacting to some extent the residual filter cake a, especially the filter cake formed by the compressible material, and thus it is difficult to obtain the desired effect. To obtain a good purging effect, the original hardening state of the residual filter cake a is first changed to loosen, which can be achieved by the blowback assembly 30 of the present invention. Secondly, the high pressure gas cannot directly sweep the surface of the filter cake, but is vented along the lower surface of the cutting edge of the blade 13, so that the filter cake is "pried" layer by layer without directly compacting the residual filter cake a under high pressure, which can be achieved by the scraping assembly 10 of the present invention. Again, pneumatic purging is to cover the entire residual cake area and push the purged residual cake a to the discharge outlet, which can be accomplished by virtue of the cooperative engagement of the scraping assembly 10 and the blowback assembly 30 of the present invention.
More specifically, as shown in fig. 1, the main structure of the present invention includes a separation tank 20 for performing a corresponding separation operation, a scraping assembly 10 and a blowback assembly 30 are disposed at the separation tank 20, and the scraping assembly 10 and the blowback assembly 30 are both connected to a gas source 40 through a series of pipes. Wherein:
the scraping assembly 10 includes a rotary shaft 11, a scraper blade 12, a blade 13 on the scraper blade 12, a back nozzle 14, and a bottom nozzle 15. As shown in fig. 2 to 3, the doctor frame 12 is divided into a left bracket and a right bracket, and is integrally formed in a straight-line structure; the left bracket and the right bracket are of regular triangular platform-shaped design structures with wide positions close to the rotating shaft 11 and narrow positions far away from the rotating shaft 11 in overlook view. The included angle beta formed by the edges of the left bracket and the right bracket and the top surface or the bottom surface of the scraper frame 12 is 85-89 degrees, or the included angle beta is 1-5 degrees with a plumb line vertical to the top surface of the scraper frame 12; therefore, when the scraper frame 12 rotates clockwise, the part close to the rotating shaft 11 contacts the material first, and the part far away from the rotating shaft 11 contacts the material later, so that the effect of pushing the material outwards from the center is achieved. And finally, the materials reach a discharge hole arranged on the side surface of the barrel body of the separation kettle 20, so that the discharging effect is realized. The rotation of the scraper holder 12 is realized by a power source such as a power motor or the like driving the rotary shaft 11 via a transmission system.
The scraper rest 12 is of a hollow triangular platform structure, and has light weight and good rigidity. Illustrated in fig. 3-4: the front side plate 12a, the rear side plate 12c, and the lower side plate 12b constituting the doctor blade holder 12 are welded to each other in a regular triangular table shape, and the doctor blade holder 12 in the regular triangular table shape has a design structure in which a portion close to the rotation shaft 11 is wide and a portion away from the rotation shaft 11 is narrow. The bottom end, namely the large end, of the scraper rest 12 is welded with the scraper rest 12, and the small end, namely the top end, is sealed by a sealing plate, so that a closed cavity is formed. In order to reduce friction between the scraper rest 12 and the material during scraping, the angle alpha between the lower side plate 12b and the horizontal plane is generally 8-12 degrees when the left bracket is welded with the scraper rest 12; the right bracket structure is similar to the above structure, and is not described, but when the right bracket is welded with the scraper frame 12, the left bracket and the right bracket form a structure uniformly distributed along the circumference of the rotating shaft 11.
The blade 13 is arc-shaped with a certain curvature, and the arc opening faces the rotation direction of the scraper holder 12, and can be generally fixed on the front side plate 12a by means of bolts, welding, and the like. According to the technical parameters of the separating kettle 20, more than five blades 13 can be arranged on the front side plates 12a of the left bracket and the right bracket in a certain order. In order to make the stress of each blade 13 smaller when scraping materials, the width of each blade 13 is limited, each blade 13 is only responsible for scraping annular fields with certain sizes, and the blades 13 are staggered and mutually complemented to form a 'complementary' blade 13 layout so as to scrape all materials. The number of complementary blades 13 in fig. 1-3 is six.
In the conventional operation, in the lifting system of the separating kettle 20 from top to bottom, the scraping assembly 10 can correspondingly generate lifting motion, so that most of materials are normally discharged. Subsequently, in order to protect the filter medium, a residual cake remains, which can only be removed completely by means of the combination of forward blowing and reverse blowing according to the invention.
In the case of a positive blowing arrangement, i.e. the scraping element 10, the invention is provided with high-pressure nozzles, i.e. the back nozzle 14 and the bottom nozzle 15, on the rear side of the blade 13 and on the bottom side of the rotary shaft 11. The axis of the knife back nozzle 14 is at a certain angle with the lower side plate 12b and is at a certain distance from the back of the blade 13, so that the air flow emitted by the knife back nozzle 14 changes the direction of the air flow when flowing through a cambered surface with a certain curvature on the back of the blade 13, and a 'prying-up' vortex-shaped air flow force can be formed when the air flow enters the surface of the residual filter cake, so that the residual filter cake is pried up, and the residual filter cake is prevented from being compacted by direct blowing of the air flow. In actual manufacturing, the back nozzle 14 may be connected to the lower side plate 12b by a screw connection, and the distance between the back nozzle 14 and the back of the blade 13 may be appropriately adjusted by adjusting the screw. A large number of application practices prove that when the curvature k=0.015-0.03 of the blade 13 is in the range of 60-150 mm, the processing difficulty of the blade 13 is small, the air flow generates an adsorption effect after flowing through the curved surface, a certain acceleration is obtained after the air flow deflects, and the air flow 'prying-up' effect is most obvious.
In order to purge the whole residual filter cake surface by the knife back nozzles 14, the back of each blade 13 is provided with a corresponding knife back nozzle 14. The air flow generated by all the knife back nozzles 14 rotates through the rotary shaft 11 to form an annular surface, the stress is limited, and the annular surfaces of all the knife back nozzles 14 are mutually complemented and staggered. In order to prevent the residual filter cake at the bottom of the scraper holder 12 from forming a purge dead zone, the bottom nozzle 15 disposed at the bottom of the rotary shaft 11 may compensate for the purge dead zone, so that the air flow direction ejected from the bottom nozzle 15 is consistent with the air flow direction ejected from the knife back nozzle 14 at the corresponding side, that is, all the air flow directions are oriented to the rotary direction of the rotary shaft 11. Under the combined action of the air flow generated by the knife back nozzle 14 and the bottom surface nozzle 15, the air flow action range of the invention covers the whole residual filter cake surface, the residual filter cake A is blown to the discharge valve arranged on the side surface of the barrel of the separation kettle 20, and finally is discharged through the filter cake discharge port.
In practical design, each high-pressure nozzle is a fan-shaped nozzle, the fan-shaped surface is acted on the surface of the residual filter cake by the maximum radian, and the material of the fan-shaped surface can be selected according to the material property.
After the high-pressure nozzle is installed, the internal air passage of the high-pressure nozzle is communicated with the air dividing passage of the lower side plate 12 b; the hollow space of the scraper holder 12 communicates with the air dividing duct and also with the inner space of the hollow rotary shaft 11. The rotary shaft 11 is a hollow shaft, the top end of the rotary shaft is connected with a rotary joint, and the tail end of the rotary shaft is provided with a left transverse channel and a right transverse channel which are respectively communicated with a left bracket and a right bracket. The gas with certain pressure enters the inner cavity of the rotary shaft 11 through the rotary joint, and enters the back nozzle 14 and the bottom nozzle 15 through the scraper frame 12, so that the air flow spraying and sweeping purpose is finally realized.
In production, the residual filter cake is at the bottom of the whole filter cake, the compression time is longest, and the hardening is generally compared. Therefore, before the air flow at the scraping assembly 10 blows and prys, the residual filter cake should be loosened for the best blowing effect. In contrast, in the present invention, as shown in fig. 1 and 5, a back-blowing module 30 is provided on the back surface of the filter disc 21, and a series of back-blowing nozzles 34 provided in a back-blowing air pipe of the back-blowing module 30 directly act on the back surface of the residual cake. The back-flushing air flow pressure of the back-flushing assembly 30 is generally not high and ranges from 0.1 MPa to 0.3MPa. To protect the filter media in the filter tray 21 from back-flushing air pressure, it is necessary to fix the filter media within a certain size range, typically a maximum length of not more than 500mm. Thus, in the separating tank 20 provided with the blowback assembly, the filter media of the filter disc 21 is fixed on the orifice plate in a partitioning manner and is fixedly connected with the supporting frame at the bottom of the orifice plate, so that the rigidity and the strength are increased. The back of each zone-fixed filter media is provided with a blowback nozzle 34. The blowback nozzles 34 are arranged on the inner header pipe 31 and the outer header pipe 32; the inner collecting main 31 and the outer collecting main 32 are communicated with each other through a connecting pipe 33 and are communicated with the blowback air pipe.
In actual operation, before the scraping assembly 10 performs air flow purging, under the control of an automatic control system program, the back-blowing air with lower pressure enters from a back-blowing air pipe, respectively enters into the inner collecting pipe 31 and the outer collecting pipe 32 through the connecting pipe 33, and finally is sprayed out from each back-blowing nozzle 34, and then the air flow passes through the liquid outlet holes of the pore plate and the meshes of the filter medium to act on the bottom of the residual filter cake so as to promote loosening of the residual filter cake. In order to protect the filter medium, the back-flushing air flow is generally operated in a pulse mode, and the implementation period is set according to the hardening condition of materials, the thickness of residual filter cakes and the like. After the blowback component has been purged for one or more circles and the corresponding scraping operation is correspondingly performed by the scraping component 10, if the residual filter cake still remains, pulse blowback can be performed again. The cooperation between the forward blowing and the backward blowing can be set by an automatic program and can be freely combined so as to adapt to different materials and different working conditions and obtain the best effect.
In the above structure, the air flow purging of the knife back nozzle 14 and the bottom surface nozzle 15 requires a relatively high air pressure, generally 0.3-0.6 MPa; the pressure required by the blowback assembly 30 is typically low, in the range of 0.1 to 0.3MPa. Therefore, it is necessary to provide a gas supply line to obtain the two different pressures. The pressure of the high-pressure air source 40 is generally 0.6-0.8 MPa, the air pressure is stable, and the air quantity is sufficient. The air source 40 enters the air source triple piece 50 through the main air passage, oil and water are removed, so that a clean air source 40 is obtained, and the air source 40 is treated, and the corresponding treatment is carried out according to the material treatment requirement of the separation kettle 20. After a clean air source meeting the process requirements is obtained, one path of air source passes through the high-pressure branch 61, the advanced overflow pressure reducing valve RV1, the pressure value is timely displayed by the pressure gauge P1, the flow speed is regulated by the adjustable one-way throttle valve TV1, the stable air flow is obtained, the on-off of the air flow is controlled by the electromagnetic valve MGV1, and the air flow enters the rotary shaft 11 through the rotary joint until reaching the bottom surface nozzle 15 and the knife back nozzle 14, so that the function of blowing the residual filter cake in the front surface is realized. The other path of low-pressure branch 62 is also regulated by an overflow pressure reducing valve RV2 to obtain lower air pressure, the pressure value is timely displayed by a pressure gauge P2, the flow rate is regulated by an adjustable one-way throttle valve TV2 to obtain stable air flow, the on-off of the air flow is controlled by an electromagnetic valve MGV2, and finally the air flow enters the separation kettle 20 through a back-blowing air pipe to loosen a residual filter cake on the back surface.
The invention can well complete the purging and cleaning of the residual filter cake, the filter cake removal rate is up to more than 80%, the filtration efficiency is improved, and the cycle period of the filter medium is prolonged. When necessary, the device can adapt to different residual filter cakes by changing blades 13 with different curvatures, changing the rotating speed and the height of the rotating shaft 11, changing the number of nozzles, changing the operating parameters of the forward blowing gas pressure and the backward blowing gas pressure and the like, and has extremely strong material adaptability and remarkable effect.
It will be understood by those skilled in the art that the present invention is not limited to the details of the foregoing exemplary embodiments, but includes other specific forms of the same or similar structures that may be embodied without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art.
Claims (9)
1. The utility model provides a residual filter cake removing equipment with air blowing effect, includes separation cauldron (20) that possess scraping subassembly (10), scraping subassembly (10) are including coaxial rotary shaft (11) that arranges in separation cauldron (20), and rotary shaft (11) top runs through separation cauldron (20) kettle cover and connect the power supply, and scraping knife rest (12) are arranged to the bottom that is located separation cauldron (20) kettle intracavity of rotary shaft (11), arranges blade (13) that are used for scraping above filter disc (21) on scraping knife rest (12); the method is characterized in that:
the scraping assembly (10) further comprises a knife back nozzle (14) arranged at the scraper rest (12), the air flow jet direction of the knife back nozzle (14) points to the back of the blade (13), and the shape of the back of the blade (13) is in a cambered surface shape which is convenient for air flow to flow along the wall surface, so that the air flow finally flows to the cutting edge of the blade (13);
the device also comprises a back-blowing assembly (30), wherein the back-blowing assembly (30) comprises a back-blowing air pipe positioned below the filter disc (21), a back-blowing nozzle (34) is arranged on the back-blowing air pipe, and the air flow injection direction of the back-blowing nozzle (34) points to the direction of the filter disc (21) from bottom to top;
the blade (13) is in an arc tile shape, and an arc opening of the blade (13) faces to the advancing direction of the blade (13); the curvature k of the blade (13) is 0.015-0.03.
2. The residual cake removal device with air blowing effect according to claim 1, wherein: the scraper frame (12) and the rotary shaft (11) are provided with hollow sealing cavities which are communicated with each other, so that the cavities of the scraper frame (12) form a connecting cavity which is communicated with the inner cavity of the rotary shaft (11) and the spraying cavity of the knife back nozzle (14); the air source (40) is communicated with the inner cavity of the rotary shaft (11) through a rotary joint positioned at the top end of the rotary shaft (11) until the air flow is conveyed to the position of the knife back nozzle (14).
3. The residual cake removal device with air blowing effect according to claim 2, characterized in that: the appearance of the scraper frame (12) is in a regular triangular platform shape with thin top and thick bottom, the bottom surface of the scraper frame (12) is fixed at the rotary shaft (11), the blade (13) is arranged at the front side plate (12 a) of the scraper frame (12), the blade back nozzle (14) is arranged at the lower side plate (12 b) of the scraper frame (12), and the front edge height formed by the cooperation of the front side plate (12 a) and the lower side plate (12 b) is lower than the rear edge height formed by the cooperation of the rear side plate (12 c) and the lower side plate (12 b).
4. A residual cake removal device with air blowing effect according to claim 3, characterized in that: the scraper frames (12) are two groups and are circumferentially and uniformly distributed along the axis of the rotary shaft (11); the blades (13) are more than two groups and are sequentially arranged along the length direction of the corresponding scraper rest (12), and the travelling paths of all the blades (13) are matched with each other to form a circular cleaning surface which is matched with the shape of the filter cake.
5. The residual cake removing device with air blowing effect according to claim 2 or 3 or 4, characterized in that: the bottom surface of the rotary shaft (11) is provided with bottom surface nozzles (15) communicated with the inner cavity of the rotary shaft (11), and the bottom surface nozzles (15) are more than two groups and are axially symmetrically arranged relative to the axis of the rotary shaft (11); in a plan view parallel to the axis of the rotary shaft (11), the bottom nozzles (15) are arranged in a spiral pattern, and the injection direction of each bottom nozzle (15) is directed in the rotation direction of the rotary shaft (11).
6. The residual cake removal device with air blowing effect of claim 5, wherein: the bottom surface nozzle (15) and the knife back nozzle (14) are all high-pressure fan-shaped nozzles.
7. The residual cake removing device with air blowing effect according to claim 1 or 2 or 3 or 4, characterized in that: the back-blowing air pipe comprises an inner collecting pipe (31) and an outer collecting pipe (32), wherein the inner collecting pipe (31) and the outer collecting pipe (32) are arranged in concentric rings, the inner collecting pipe (31) and the outer collecting pipe (32) are positioned on the same plane, and the inner collecting pipe and the outer collecting pipe are connected with each other through a connecting pipe (33) extending in the radial direction; the blowback nozzles (34) are uniformly distributed on the upper ring surfaces of the inner collecting pipe (31) and the outer collecting pipe (32).
8. The residual cake removal device with air blowing effect of claim 7, wherein: the filter disc (21) comprises filter media and pore plates for fixing the filter media in a partitioning mode, wherein the filter media are arranged in a stacked mode from top to bottom, and supporting frames with a rigidity reinforcing effect are arranged on the bottom surfaces of the pore plates.
9. A system employing a residual cake removal device having a blowing effect as claimed in claim 1 or 2 or 3 or 4, characterized by: the system comprises an air supply pipeline for supplying air to a scraping assembly (10) and a back blowing assembly (30), wherein the air supply pipeline comprises an air source (40), and the air source (40) is divided into a high-pressure branch (61) and a low-pressure branch (62) after passing through an air source triple piece (50); the high-pressure branch (61) is communicated with the inner cavity of the rotary shaft (11) after passing through the overflow pressure reducing valve RV1, the pressure gauge P1, the adjustable one-way throttle valve TV1 and the electromagnetic valve MGV1 in sequence, and the low-pressure branch (62) is communicated with the back blowing air pipe after passing through the overflow pressure reducing valve RV2, the pressure gauge P2, the adjustable one-way throttle valve TV2 and the electromagnetic valve MGV2 in sequence.
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