CN115212724B - Filtration system and method for liquid concentration - Google Patents
Filtration system and method for liquid concentration Download PDFInfo
- Publication number
- CN115212724B CN115212724B CN202210836677.3A CN202210836677A CN115212724B CN 115212724 B CN115212724 B CN 115212724B CN 202210836677 A CN202210836677 A CN 202210836677A CN 115212724 B CN115212724 B CN 115212724B
- Authority
- CN
- China
- Prior art keywords
- filter
- filter cylinder
- circulating
- cylinder body
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 95
- 238000001914 filtration Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000000706 filtrate Substances 0.000 claims abstract description 72
- 238000003756 stirring Methods 0.000 claims abstract description 53
- 230000004087 circulation Effects 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 238000011001 backwashing Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 24
- 238000007599 discharging Methods 0.000 claims description 12
- 239000011344 liquid material Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 15
- 238000011010 flushing procedure Methods 0.000 description 9
- 230000008929 regeneration Effects 0.000 description 8
- 238000011069 regeneration method Methods 0.000 description 8
- 238000007789 sealing Methods 0.000 description 6
- 238000013019 agitation Methods 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000010806 kitchen waste Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004089 microcirculation Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000011175 product filtration Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
Abstract
The invention relates to a filtration system and a method for liquid concentration, the filtration system comprising: concentration filter: the filter comprises a filter cylinder body, a rotating shaft, a stirring rotary table, a filter medium and a stirring driving piece, wherein the top of the filter cylinder body is sealed by adopting a filter upper cover, an exhaust port is arranged on the filter upper cover, a dense-phase exhaust port, a raw material liquid inlet and a filtrate outlet are also arranged at the bottom of the filter cylinder body, the rotating shaft is arranged in the filter cylinder body, the bottom end of the rotating shaft penetrates through the bottom of the filter cylinder body and is in driving connection with the stirring driving piece, the stirring rotary table and the filter medium are also fixedly arranged on the rotating shaft, and a filtrate cavity connected with the filtrate outlet is also arranged in the rotating shaft; and (3) a circulation tank: the filter cylinder is also connected with the filter cylinder body through a circulating liquid circulating pipeline and forms circulation. The filtering system is convenient to operate and simple in structure, and effectively solves the problems of uneven concentration process, poor backwashing effect and the like.
Description
Technical Field
The invention belongs to the technical field of filtering and concentrating equipment, and relates to a filtering system and a method for concentrating liquid.
Background
Along with the high-speed development of economy and science and technology in China, a part of the concentration process is indispensable in the fields of foods and medicines and other fine chemical industry, the current common concentration methods comprise evaporation concentration, filtration concentration and the like, wherein the filtration concentration method with lower energy consumption is most widely used, but the membrane concentration effect in the current concentration process is most outstanding, and the effect is most stable. But in the concentration process, along with the progress of process, concentrated material can pile up gradually in the system and sink or come up, cause in the system filter media to receive the pollution of different degree, be unfavorable for the continuous stable of filtration process to go on, moreover because the material pile up the degree at filter media surface difference, after back-flushing or backwash, filter media's regeneration condition liquid is different completely, the filter media that the material pile up serious often can't obtain abundant regeneration, and then influence subsequent filtration process and filter media's life. However, the technology of guaranteeing the filtering process of the concentrated solution and the regeneration effect of the filter medium is rarely met at present, and the aspect of a liquid concentration filtering system which is particularly convenient, quick and easy to operate is still in a blank stage.
Chinese patent 200911000086.3 "system and method for liquid filtration" provides a system having one or more normal flow filtration systems connected to a cartridge at an outlet of a housing in the system. The green pass is internally received in the bowl and preferably depends from the outlet value. The liquid enters the bowl of the housing and contacts the outer surface of the one or more filter cartridges. Impurities are trapped on or in the surface of the cartridge and filtered liquid passes through the filter to the outlet. One or more parameters of flow, differential pressure or time are measured and when a set point is reached, filtration is stopped. The reverse flushing of the filter cartridge is performed to remove impurities on the surface of the filter. The method can be used for long-term product filtration. However, the method cannot avoid the problems of uneven blocking of the filter medium, incomplete regeneration of the filter medium and the like caused by deposition of concentrated materials.
The device provided by Chinese patent 201711382699.2 'a liquid filter treatment device and method', comprising a cylindrical filtering body, wherein the filtering body comprises a base part and a filtering part, the filtering part is fixedly arranged at the center of the top of the base part, input pipes are arranged in the base part and the filtering part, the inlets of the input pipes are positioned at the bottom of the base part and are communicated with an external liquid conveying pipeline, the tops of the foreign language filtering parts of the input pipes are in a spherical structure when the tops of the filtering parts are in a spherical structure, a filtering ring for the filtering body is fixedly arranged around the side surface of the filtering part, an annular recovery groove is formed on the base part, the formed recovery groove surrounds the periphery of the bottom of the filtering part, and a plurality of output pipes communicated with an external liquid output pipeline are arranged in the bottom of the recovery groove; the invention effectively improves the filtering treatment efficiency and effect of the oily liquid, can carry out targeted filtering treatment according to the oily liquid needing to be filtered from different sources, and improves the filtering diversity. But the invention does not have obvious improvement on the regeneration effect of the filtering medium for the concentrated phase liquid after filtration and concentration.
Disclosure of Invention
The invention aims to provide a filtering system and a method for liquid concentration, which ensure the stable operation of the filtering process and ensure that the filtering medium participating in the filtering process is always in a stable and uniform state and the like through the rotation of the filtering medium and the circulation process of concentrated phase materials in the system in the concentration process.
The aim of the invention can be achieved by the following technical scheme:
one of the aspects of the present invention provides a filtration system for liquid concentration comprising:
concentration filter: the filter comprises a filter cylinder body with an open upper part, a rotating shaft, a stirring rotary table, a filter medium and a stirring driving piece, wherein the top of the filter cylinder body is sealed by adopting a filter upper cover, an exhaust port is arranged on the filter upper cover, a concentrated phase exhaust port, a raw material liquid inlet and a filtrate outlet are also arranged at the bottom of the filter cylinder body, the rotating shaft is arranged in the filter cylinder body, the bottom end of the rotating shaft penetrates through the bottom of the filter cylinder body and is in driving connection with the stirring driving piece 8, the stirring rotary table and the filter medium are also fixedly arranged on the rotating shaft, a filtrate cavity connected with the filtrate outlet is also arranged in the rotating shaft, the filtrate cavity is also connected with the filter medium, and filtrate filtered by the filter medium can enter the filtrate cavity;
and (3) a circulation tank: the filter cylinder is also connected with the filter cylinder body through a circulating liquid circulating pipeline and forms circulation.
Furthermore, the side walls of the upper part and the lower part of the filter cylinder body are respectively provided with a circulating interface, the bottom and the side part of the circulating tank are respectively provided with a circulating liquid inlet and a circulating liquid outlet, and the circulating liquid inlet and the circulating liquid outlet are respectively connected with the two circulating interfaces on the filter cylinder body through circulating liquid pipelines.
Furthermore, a back washing liquid branch is also arranged at the filtrate outlet.
Further, the stirring turntable is positioned below the filter medium.
Furthermore, the rotating shaft is provided with a plurality of small holes at the connecting interface part of the filter medium, and the small holes are communicated with the filtrate cavity.
Further, the diameter of the small hole is 2-15 mm.
Further, the bottom of the circulating tank is higher than the upper edge of the filter cylinder, and the height difference between the bottom of the circulating tank and the upper edge of the filter cylinder is 10cm-500cm. Further, an exhaust valve is also arranged on the circulating tank.
Further, the stirring turnplate is a vortex stirring paddle, and the outer edge of the stirring paddle is larger than 15% of the diameter of the filter medium (namely, the diameter of a circle formed by the outer edge of the stirring turnplate is larger than 15% of the diameter of a circle formed by the outer edge of the circular filter medium). Meanwhile, the distance between the nearest filter medium and the stirring rotary table should be greater than or equal to 50% of the length of the radius of the stirring rotary table.
Further, the filter medium is disc-shaped, the surface of the filter medium is a filter surface, the inside of the filter medium is a hollow structure communicated with the filter surface, and the hollow structure is communicated with the filtrate cavity.
Further, the filter medium is provided with a plurality of filter media along the axial direction of the rotating shaft.
Further, the effective volume in the circulating tank is 10-30% of the effective volume in the concentration filter.
Further, a pressure gauge for displaying the internal pressure of the filter cylinder is arranged on the upper cover of the filter.
A second aspect of the present invention provides a filtration method for liquid concentration based on a filtration system as described in any one of the preceding claims, the filtration method comprising the steps of:
(1) The method comprises the steps of opening a raw material liquid inlet, an exhaust port and a filtrate outlet of a filter cylinder, closing other non-related process ports, introducing liquid materials into a concentration filter, starting a rotary driving piece to drive a rotary shaft, a filter medium and a stirring turntable to synchronously rotate, and closing the exhaust port when liquid overflows from the exhaust port, so that the pressure in the filter cylinder rises to a set target value;
(2) After the internal pressure of the filter cylinder reaches a set target value, starting circulation between the circulating tank and the filter cylinder, sucking the material at the bottom of the filter cylinder to the bottom of the circulating tank, and discharging the material from the side of the circulating tank to the upper part of the filter cylinder to form a uniform solid-liquid mixture in the concentrated filter;
(3) And continuously discharging the filtrate filtered by the filter medium through a filtrate outlet, closing a raw material liquid inlet and the filtrate outlet after the material in the filter cylinder body is concentrated, and then opening a concentrated phase discharge outlet to perform discharging operation.
Further, in the above-mentioned filtration operation process, when running for a period of time, it is found that the filtrate outflow rate is reduced or the pressure representation number is increased to be within the guard range, the feed liquid inlet and the filtrate outlet may be closed, the exhaust valve on the circulation tank and the backwash inlet (i.e., the valve port on the backwash liquid branch) may be opened, the backwash operation or the backwash operation may be performed, after the period is ended, the backwash inlet and the exhaust valve may be closed, and the feed liquid inlet and the filtrate outlet may be opened to continue the filtration operation.
Compared with the prior art, the invention has the following advantages:
(1) In the invention, the concentrated materials in the system can be subjected to double functions of stirring in the system, slow flow of the circulating pump and the like in the material concentration process, so that the concentrated solution is uniformly distributed in the system, the pollution degree of each filtering surface of each filtering medium in the process rate process is relatively average, and the stable and continuous filtering rate is ensured.
(2) In the back flushing process of the filter medium, the inside of the system needs to be exhausted outwards, the invention ensures that the liquid in the system can not be exhausted out of the system due to residual pressure in the back flushing or back flushing process, and ensures the back flushing process and the back flushing effect. And after backwashing or back blowing, the cleaning effect of the filtering surface of the filtering medium in the system is basically the same, so that the regeneration effect and the service life of the filtering medium are ensured.
(3) Compared with a general filtering system, the filter medium can play two roles, firstly, the stirring paddle can rapidly expand the rotational flow formed by stirring the concentrated materials in the cylinder body through the blades in the high-speed rotation process of the filter medium, and the occurrence of concentration polarization effect is reduced; second, the high-speed rotation of the paddles also creates an upward liquid flow, avoiding deposition of concentrated phase at the bottom after concentration, while allowing rapid upward flow and transfer of material in the cartridge, providing a portion of dynamic support for the internal microcirculation of the system.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
the figure indicates:
1-exhaust valve, 2-circulation tank, 3-filter upper cover, 4-filter cylinder, 5-circulation pump, 6-raw material liquid inlet, 7-mechanical seal assembly, 8-stirring motor, 9-filtrate outlet, 10-dense phase outlet, 11-stirring turntable, 12-rotation shaft, 13-filter medium, 14-concentration filter, 15-top sealing structure, 16-pressure gauge and 17-exhaust port.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; may be directly connected or indirectly connected through an intermediate medium, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
In order to solve the technical defects of poor diffusion effect of concentrated solution, poor regeneration effect of the filter medium 13 and the like in the prior art, the invention provides a filter system for concentrating liquid, the structure of which is shown in fig. 1, which comprises:
concentration filter 14: the filter comprises a filter cylinder body 4 with an open upper part, a rotating shaft 12, a stirring rotary table 11, a filter medium 13 and a stirring driving piece 8, wherein the top of the filter cylinder body 4 is sealed by a filter upper cover 3, an exhaust port 17 is arranged on the filter upper cover 3, a dense phase exhaust port 10, a raw material liquid inlet 6 and a filtrate outlet 9 are also arranged at the bottom of the filter cylinder body 4, the rotating shaft 12 is arranged in the filter cylinder body 4, the bottom end of the rotating shaft 12 penetrates through the bottom of the filter cylinder body 4 and is in driving connection with the stirring driving piece 8, the stirring rotary table 11 and the filter medium 13 are also fixedly arranged on the rotating shaft 12, a filtrate cavity connected with the filtrate outlet 9 is also arranged in the rotating shaft 12, and the filtrate cavity is also connected with the filter medium 13, so that the filtrate filtered by the filter medium 13 can enter the filtrate cavity;
circulation tank 2: which is also connected to the filter cylinder 4 via a circulation line and constitutes a circulation.
In some specific embodiments, the side walls of the upper part and the lower part of the filter cylinder 4 are also provided with circulation interfaces respectively, the bottom and the side part of the circulation tank 2 are provided with a circulation liquid inlet and a circulation liquid outlet respectively, and the circulation liquid inlet and the circulation liquid outlet are connected with the two circulation interfaces on the filter cylinder 4 respectively through a circulation liquid flow pipeline.
In some embodiments, the filtrate outlet 9 is further provided with a backwash liquid branch.
In some embodiments, the agitator disk 11 is positioned below the filter media 13.
In some embodiments, the rotating shaft 12 is further provided with a plurality of small holes at the connection interface part of the filter medium 13, and the through holes are communicated with the filtrate cavity.
Further, the diameter of the small hole is 2-15 mm.
In some embodiments, the bottom of the circulation tank 2 is higher than the upper edge of the filter cylinder 4, and the height difference between the two is in the range of 10cm-500cm.
In some embodiments, the circulation tank 2 is also provided with an exhaust valve 1.
In some embodiments, the agitator disk 11 is a vortex type agitator blade, and the outer edge of the agitator blade should be greater than 15% of the diameter of the filter media 13 (i.e., the diameter of the circle defined by the outer edge of the agitator disk 11 should be greater than 15% of the diameter of the circle defined by the outer edge of the circular filter media 13). Meanwhile, the filter medium 13 closest to the agitation rotor 11 should be at least 50% of the length of the radius of the agitation rotor 11.
In some specific embodiments, the filter medium 13 is in a disc shape, the surface of the filter medium is a filter surface, the inside of the filter medium is a hollow structure communicated with the filter surface, and the hollow structure is communicated with the filtrate cavity.
In some embodiments, the filter medium 13 is disposed on the rotating shaft 12 along the axial direction thereof.
In some embodiments, the effective volume within the recirculation tank 2 is 10-30% of the effective volume within the concentrate filter 14.
In some embodiments, a pressure gauge 16 is provided on the filter top cover 3 for indicating the pressure inside the filter cartridge 4. Meanwhile, a top sealing structure is further arranged on the upper filter cover 3 and used for sealing the top of the rotating shaft.
In some specific embodiments, a mechanical seal assembly 7 is further arranged between the stirring shaft and the stirring driving piece 8 (which may be composed of the stirring motor 8 and a matched speed reducer), the mechanical seal assembly 7 includes a mechanical seal for sealing the liquid in the cylinder and a rotary bearing assembly for rotary support, which may be a conventional structure for realizing corresponding sealing and rotary support functions in the field, and meanwhile, the lower end of the stirring driving piece 8 is also connected with a filtrate outlet 9.
A second aspect of the present invention provides a filtration method for liquid concentration based on a filtration system as described in any one of the preceding claims, the filtration method comprising the steps of:
(1) The raw material liquid inlet 6, the air outlet 17 and the filtrate outlet 9 of the filter cylinder 4 are all opened, other non-involved process ports are closed, liquid materials are introduced into the concentration filter 14, a rotary driving piece is started to drive the rotary shaft 12, the filter medium 13 and the stirring turntable 11 to synchronously rotate, and when liquid overflows from the air outlet 17, the air outlet 17 is closed, so that the internal pressure of the filter cylinder 4 rises to a set target value;
(2) After the internal pressure of the filter cylinder 4 reaches a set target value, starting the circulation between the circulation tank 2 and the filter cylinder 4, sucking the material at the bottom of the filter cylinder 4 to the bottom of the circulation tank 2, and discharging the material from the side of the circulation tank 2 to the upper part of the filter cylinder 4, so that a uniform solid-liquid mixture is formed in the concentrated filter 14;
(3) The filtrate filtered by the filter medium 13 is continuously discharged through the filtrate outlet 9, after the material in the filter cylinder 4 is concentrated, the raw material liquid inlet 6 and the filtrate outlet 9 are closed, and then the dense phase discharge outlet 10 is opened for discharging operation.
In some specific embodiments, during the above filtering operation, when the filtrate outflow rate is found to be reduced or the number of the pressure gauge 16 is increased to be within the guard range during a period of time, the raw material liquid inlet 6 and the filtrate outlet 9 may be closed, the air outlet valve 1 and the backwash inlet (i.e. the valve ports on the backwash liquid branch) on the circulation tank 2 may be opened, the backwash inlet and the air outlet valve 1 may be closed after the period is completed, and the raw material liquid inlet 6 and the filtrate outlet 9 may be opened to continue the filtering operation.
The above embodiments may be implemented singly or in any combination of two or more.
The above embodiments are specifically described below with reference to specific examples.
Example 1:
in order to solve the technical defects of poor diffusion effect of the concentrated solution, poor regeneration effect of the filter medium 13 and the like in the prior art, the embodiment provides a filter system for concentrating the liquid, the structure of which is shown in fig. 1, comprising:
concentration filter 14: the filter comprises a filter cylinder body 4 with an open upper part, a rotating shaft 12, a stirring rotary table 11, a filter medium 13 and a stirring driving piece 8, wherein the top of the filter cylinder body 4 is sealed by a filter upper cover 3, an exhaust port 17 is arranged on the filter upper cover 3, a dense phase exhaust port 10, a raw material liquid inlet 6 and a filtrate outlet 9 are also arranged at the bottom of the filter cylinder body 4, the rotating shaft 12 is arranged in the filter cylinder body 4, the bottom end of the rotating shaft 12 penetrates through the bottom of the filter cylinder body 4 and is in driving connection with the stirring driving piece 8, the stirring rotary table 11 and the filter medium 13 are also fixedly arranged on the rotating shaft 12, a filtrate cavity connected with the filtrate outlet 9 is also arranged in the rotating shaft 12, the filtrate cavity is also connected with the filter medium 13, and filtrate filtered by the filter medium 13 can enter the filtrate cavity;
circulation tank 2: which is also connected with the filter cylinder 4 through a circulating liquid circulating pipeline and forms circulation.
The side walls of the upper part and the lower part of the filter cylinder body 4 are also respectively provided with a circulating interface, the bottom and the side part of the circulating tank 2 are respectively provided with a circulating liquid inlet and a circulating liquid outlet, and the circulating liquid inlet and the circulating liquid outlet are respectively connected with the two circulating interfaces on the filter cylinder body 4 through circulating liquid flow pipelines.
The filtrate outlet 9 is also provided with a backwash liquid branch, and a backwash inlet is arranged on the backwash liquid branch, and of course, the backwash inlet and the filtrate outlet 9 can be combined and shared. The agitator rotor 11 is located below the filter medium 13. The rotary shaft 12 is further provided with a plurality of small holes at the connection interface portion of the filter medium 13, and the through holes are communicated with the filtrate cavity. The diameter of the small hole is 2-15 mm, and the preferred diameter is about 8mm in this embodiment. The bottom of the circulation tank 2 is higher than the upper edge of the filter cylinder 4 by about 200mm. The circulating tank 2 is also provided with an exhaust valve 1. The stirring rotor 11 is a vortex stirrer, and the outer edge of the stirrer should be greater than 15% of the diameter of the filter medium 13 (i.e. the diameter of the circle formed by the outer edge of the stirring rotor 11 should be greater than 15% of the diameter of the circle formed by the outer edge of the circular filter medium 13), in this embodiment, the diameter of the stirring rotor 11 is about 400nm, and the diameter of the filter medium 13 is about 320mm. Meanwhile, the filter medium 13 closest to the agitation rotor 11 should be at least 50% of the length of the radius of the agitation rotor 11, i.e., the lowermost filter medium 13 is spaced from the agitation rotor 11 by about 150 mm. The filter medium 13 is in a butterfly shape, the surface of the filter medium is a filter surface, the filter precision of the filter surface is about 1 mu m, the inside of the filter medium is a hollow structure communicated with the filter surface, and the hollow structure is communicated with the filtrate cavity, so that the filtrate can be discharged. The filter medium 13 is provided in a plurality on the rotary shaft 12 in the axial direction thereof. The effective volume in the circulation tank 2 is 10 to 30% of the effective volume in the concentration filter 14, and in this embodiment, the effective volume of the circulation tank 2 is 15L, and the effective volume of the concentration filter 14 is 100L. The filter upper cover 3 is provided with a pressure gauge 16 for displaying the pressure inside the filter cylinder 4. And a mechanical seal assembly 7 is further arranged between the stirring shaft and a stirring driving piece 8 (which can be composed of a stirring motor 8 and a matched speed reducer), the mechanical seal assembly 7 comprises components such as a mechanical seal for sealing liquid in the cylinder body, a rotary bearing for rotary support and the like, and meanwhile, the lower end of the stirring driving piece 8 is also connected with a filtrate outlet 9.
The filtering method for liquid concentration of the embodiment specifically comprises the following steps:
(1) Feed and filtration
The raw material liquid inlet 6 and the air outlet 17 are opened, the filtrate outlet 9 is opened, the inlet and outlet of the circulating tank 2 are opened, other process ports are closed, liquid materials are introduced into the concentration filter 14 through the raw material liquid inlet 6, a rotating motor is started, the rotating speed is adjusted to 600r/min, the rotating shaft 12, the filter medium 13 and the stirring turntable 11 are driven to synchronously rotate through the mechanical seal assembly 7, when the air outlet 17 overflows with liquid, the air outlet 17 is closed, the pressure in the filter cylinder 4 rises, and after the pressure gauge 16 on the filter upper cover 3 displays that the pressure reaches 0.2Mpa, the next operation is carried out.
(2) Circulation
After the pressure gauge 16 shows that the pressure reaches 0.2Mpa, the circulating pump 5 is started, the material is sucked from the bottom of the filter cylinder 4 through the micro pressure provided by the circulating pump 5, and is discharged to the filter cylinder 4 from the upper side wall of the circulating tank 2 after passing through the circulating tank 2, so that a relatively uniform solid-liquid mixture is formed inside the concentration filter 14.
(3) Back flushing or backwashing
After a period of time, when the filtrate outflow rate is found to be reduced or the number of the pressure gauge 16 is increased to 0.25Mpa, the raw material liquid inlet 6 and the filtrate outlet 9 are closed, the exhaust valve 1 and the backwash inlet on the circulation tank 2 are opened, the backwash operation is performed, the backwash pressure is 0.3Mpa, the backwash cycle is about 30s, after the backwash cycle is finished, the backwash inlet and the exhaust valve 1 of the circulation tank 2 are closed, and the raw material liquid inlet 6 and the filtrate outlet 9 are opened to continue the filtering operation.
(4) Discharging material
After the concentration of the material in the concentration filter 14 reaches 10 times of the required concentration, the filtration is finished, the raw material liquid inlet 6 and the filtrate outlet 9 are closed, and then the concentrated phase outlet 10 and the exhaust port 17 are opened for discharging operation.
The concentration effect near the surfaces of the upper and lower filter media 13 in the concentration process is relatively uniform through the observation of the barrel view mirror, and the filtration rate can be restored to the filtration rate in the initial stage after back blowing.
Example 2
The system is used for oil-water separation of kitchen waste, and is different from the embodiment 1 in that:
the rotation rate of the motor is adjusted to 150r/min, the filter element in the filter medium 13 is a disc organic film with the precision of 0.2 mu m, the back blowing period is 5s, the feeding pressure is 0.25Mpa, the back blowing pressure is 0.4Mpa,
the implementation process comprises the following steps:
(1) The raw material liquid inlet 6 and the air outlet 17 are opened, the filtrate outlet 9 is opened, the inlet and outlet of the circulating tank 2 are opened, other process ports are closed, liquid materials are introduced into the concentration filter 14, the rotating motor is started, the rotating speed is adjusted to 150r/min, the rotating shaft 12, the filter medium 13 and the stirring turntable 11 are driven to synchronously rotate by the mechanical seal assembly 7, when the air outlet 17 overflows liquid, the air outlet 17 is closed, the pressure in the filter cylinder 4 rises, and after the pressure gauge 16 on the filter upper cover 3 displays that the pressure reaches 0.25Mpa, the next operation is carried out.
(2) Circulation
After the pressure gauge 16 shows that the pressure reaches 0.52Mpa, the circulating pump 5 is started, the material is sucked from the bottom of the cylinder by the micro pressure provided by the circulating pump 5, and is discharged to the filter cylinder 4 from the side wall of the upper part of the circulating tank 2 after passing through the circulating tank 2, so that a relatively uniform solid-liquid mixture is formed inside the concentration filter 14.
(3) Back flushing or backwashing
After a period of time, when the filtrate outflow rate is found to be reduced or the number of the pressure gauge 16 is increased to 0.3Mpa, the raw material liquid inlet 6 and the filtrate outlet 9 are closed, the exhaust valve 1 and the backwash inlet on the circulation tank 2 are opened, the backwash operation is performed, the backwash pressure is 0.4Mpa, the backwash period is about 5s, after the backwash period is finished, the backwash inlet and the exhaust valve 1 are closed, and the raw material liquid inlet 6 and the filtrate outlet 9 are opened to continue the filtering operation.
(7) Discharging material
After the concentration of the material in the concentration filter 14 reaches 5 times of the required concentration, the filtration is finished, the raw material liquid inlet 6 and the filtrate outlet 9 are closed, and then the concentrated phase outlet 10 and the exhaust port 17 are opened for discharging operation.
The upper and lower filter media 13 were similar in surface to example 1 in the concentration process as viewed through the barrel mirror, and the filtration rate was also restored to the initial stage filtration rate after blowback.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (3)
1. A filtration system for liquid concentration, comprising:
concentration filter: the filter comprises a filter cylinder body with an open upper part, a rotating shaft, a stirring rotary table, a filter medium and a stirring driving piece, wherein the top of the filter cylinder body is sealed by adopting a filter upper cover, an exhaust port is arranged on the filter upper cover, a concentrated phase exhaust port, a raw material liquid inlet and a filtrate outlet are also arranged at the bottom of the filter cylinder body, the rotating shaft is arranged in the filter cylinder body, the bottom end of the rotating shaft penetrates through the bottom of the filter cylinder body and is in driving connection with the stirring driving piece, the stirring rotary table and the filter medium are also fixedly arranged on the rotating shaft, a filtrate cavity connected with the filtrate outlet is also arranged in the rotating shaft, the filtrate cavity is also connected with the filter medium, and filtrate filtered by the filter medium can enter the filtrate cavity;
and (3) a circulation tank: the filter cylinder is also connected with the filter cylinder body through a circulating liquid circulating pipeline and forms circulation;
the side walls of the upper part and the lower part of the filter cylinder body are respectively provided with a circulating interface, the bottom and the side part of the circulating tank are respectively provided with a circulating liquid inlet and a circulating liquid outlet, and the circulating liquid inlet and the circulating liquid outlet are respectively connected with the two circulating interfaces on the filter cylinder body through circulating liquid flow pipelines;
the stirring turntable is positioned below the filter medium, the fluid movement direction is upward in the stirring process, the diameter of a circle formed by the periphery of the stirring turntable is larger than 15% of the diameter of the circular outer edge of the filter medium, and the distance between the stirring turntable and the nearest filter medium is larger than or equal to 50% of the radius of the stirring turntable;
the filter medium is disc-shaped, the surface of the filter medium is a filter surface, the inside of the filter medium is a hollow structure communicated with the filter surface, and the hollow structure is communicated with the filtrate cavity;
the filter medium is axially provided with a plurality of filter media on the rotating shaft;
the filtrate outlet is also provided with a backwashing liquid branch;
the rotating shaft is provided with a plurality of small holes at the connecting interface part of the filter medium, and the small holes are communicated with the filtrate cavity;
the bottom of the circulating tank is higher than the upper edge of the filter cylinder, and the height difference between the bottom of the circulating tank and the upper edge of the filter cylinder is 10cm-500cm;
the effective volume in the circulating tank is 10-30% of the effective volume in the concentration filter.
2. A filtration system for concentrating liquids according to claim 1, wherein said small holes have a diameter of 2 to 15mm.
3. A filtration method for liquid concentration based on the filtration system according to claim 1 or 2, characterized in that the filtration method comprises the steps of:
(1) The method comprises the steps of opening a raw material liquid inlet, an exhaust port and a filtrate outlet of a filter cylinder, introducing liquid materials into a concentration filter, starting a rotary driving piece to drive a rotary shaft, a filter medium and a stirring turntable to synchronously rotate, and closing the exhaust port when liquid overflows from the exhaust port, so that the internal pressure of the filter cylinder rises to a set target value;
(2) After the internal pressure of the filter cylinder reaches a set target value, starting circulation between the circulating tank and the filter cylinder, sucking the material at the bottom of the filter cylinder to the bottom of the circulating tank, and discharging the material from the side of the circulating tank to the upper part of the filter cylinder to form a uniform solid-liquid mixture in the concentrated filter;
(3) And continuously discharging the filtrate filtered by the filter medium through a filtrate outlet, closing a raw material liquid inlet and the filtrate outlet after the material in the filter cylinder body is concentrated, and then opening a concentrated phase discharge outlet to perform discharging operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210836677.3A CN115212724B (en) | 2022-07-15 | 2022-07-15 | Filtration system and method for liquid concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210836677.3A CN115212724B (en) | 2022-07-15 | 2022-07-15 | Filtration system and method for liquid concentration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115212724A CN115212724A (en) | 2022-10-21 |
| CN115212724B true CN115212724B (en) | 2024-01-23 |
Family
ID=83611423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210836677.3A Active CN115212724B (en) | 2022-07-15 | 2022-07-15 | Filtration system and method for liquid concentration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115212724B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1024606A (en) * | 1964-04-29 | 1966-03-30 | Schenk Filterbau Gesellshaft M | Improvements in or relating to filter apparatus |
| GB1278629A (en) * | 1968-08-30 | 1972-06-21 | Mta | Continuous filtration process with recirculation |
| CN2766930Y (en) * | 2005-03-04 | 2006-03-29 | 邱宝辰 | Dynamic filtering machine |
| CN101601946A (en) * | 2009-06-25 | 2009-12-16 | 徐柏根 | A kind of rotary dynamic closed filtering process and device |
| CN109331525A (en) * | 2018-11-02 | 2019-02-15 | 四川新叶环保工程股份有限公司 | A kind of dynamic shallow-layer filter device |
| CN212757555U (en) * | 2020-07-31 | 2021-03-23 | 李雨芹 | Sewage treatment device fiber turntable |
| CN215324618U (en) * | 2021-07-27 | 2021-12-28 | 上海爱仑倍思环境科技有限公司 | Storage device of zero-valent iron suspension |
| CN113968595A (en) * | 2021-10-22 | 2022-01-25 | 上海安赐环保科技股份有限公司 | Preparation method of ternary cathode material precursor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2954174B1 (en) * | 2009-12-17 | 2014-04-11 | Otvs A | PROCESS FOR POTABILIZING AND / OR PURIFYING WATER COMPRISING THE REMOVAL OF A TARGET COMPOUND AND FILTRATION WITHIN A FILTER DRUM |
-
2022
- 2022-07-15 CN CN202210836677.3A patent/CN115212724B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1024606A (en) * | 1964-04-29 | 1966-03-30 | Schenk Filterbau Gesellshaft M | Improvements in or relating to filter apparatus |
| GB1278629A (en) * | 1968-08-30 | 1972-06-21 | Mta | Continuous filtration process with recirculation |
| CN2766930Y (en) * | 2005-03-04 | 2006-03-29 | 邱宝辰 | Dynamic filtering machine |
| CN101601946A (en) * | 2009-06-25 | 2009-12-16 | 徐柏根 | A kind of rotary dynamic closed filtering process and device |
| CN109331525A (en) * | 2018-11-02 | 2019-02-15 | 四川新叶环保工程股份有限公司 | A kind of dynamic shallow-layer filter device |
| CN212757555U (en) * | 2020-07-31 | 2021-03-23 | 李雨芹 | Sewage treatment device fiber turntable |
| CN215324618U (en) * | 2021-07-27 | 2021-12-28 | 上海爱仑倍思环境科技有限公司 | Storage device of zero-valent iron suspension |
| CN113968595A (en) * | 2021-10-22 | 2022-01-25 | 上海安赐环保科技股份有限公司 | Preparation method of ternary cathode material precursor |
Non-Patent Citations (1)
| Title |
|---|
| 丁启圣.《新型实用过滤技术》.冶金工业出版社,2011,第177-178页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115212724A (en) | 2022-10-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3402611B2 (en) | Rotating disk type filtration device that can be immersed | |
| CN101700472B (en) | Rotary membrane separation device and application thereof | |
| US5143630A (en) | Rotary disc filtration device | |
| JP3577460B2 (en) | Rotating disk type filtration device equipped with means for reducing axial force | |
| CN108939922A (en) | A kind of rotary type ceramic film is separated by filtration technique and device | |
| CN202237500U (en) | Dynamic filter | |
| CN113788513B (en) | Filtering and separating device and application thereof | |
| CN201586483U (en) | Novel rotary membrane separation device | |
| CN115212724B (en) | Filtration system and method for liquid concentration | |
| CN111495028B (en) | Biological fermentation membrane separation and purification equipment | |
| CN218249912U (en) | Spherical filtering, washing and drying machine | |
| CN204684958U (en) | A kind of modified rotates film sewage filter device | |
| CN204727643U (en) | A kind of rotation film sewage filter device | |
| CN213348408U (en) | A ultrafiltration device for enzyme preparation production | |
| CN112080412B (en) | Ultrafiltration device for enzyme preparation | |
| CN113856476A (en) | Dynamic disc membrane washing system and process | |
| CN107930401A (en) | A kind of rotary organic nanofiltration membrane filtration apparatus | |
| CN204395781U (en) | Pressure reduction revolving horizontal drum isolated by filtration machine | |
| CN215963010U (en) | Dynamic disc film washing system | |
| CN209428509U (en) | A kind of aerobic-anaerobic compound bacteria fermentation purifying tank | |
| CN216419372U (en) | External dynamic separation circulation system | |
| CN215693227U (en) | Separation and purification device | |
| CN215463341U (en) | Self-turbulent flow ceramic membrane filter | |
| CN216395909U (en) | Dynamically rotating axial flow ceramic membrane component | |
| CN219072248U (en) | Suction filtration device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |