CN118001832A - Filter element-filter material combined cross-flow filtering method and device - Google Patents
Filter element-filter material combined cross-flow filtering method and device Download PDFInfo
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- CN118001832A CN118001832A CN202410257102.5A CN202410257102A CN118001832A CN 118001832 A CN118001832 A CN 118001832A CN 202410257102 A CN202410257102 A CN 202410257102A CN 118001832 A CN118001832 A CN 118001832A
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Abstract
The disclosure belongs to the field of liquid-solid separation, relates to a filter element-filter material combined cross-flow filtration method and a device, and provides a filter element-filter material combined cross-flow filtration method, which comprises the following steps: the filter element and the filter material are arranged in a specific mode, and the high-efficiency removal of the particles in the liquid is realized through the interception and adsorption of the filter material; the filter cake layer on the upper layer of the filter medium is taken away by utilizing the transverse flow of the fluid on the surface of the filter medium so as to reduce the thickness of the filter cake layer; after the serious blocking flux of the pore canal of the filter material is reduced and the pressure difference is increased, the filter element is cleaned and the filter material is regenerated through water and air mixed backwashing. A filter element-filter material combined cross-flow filter device for the method is also provided. The method is adopted to carry out purification treatment on the high-concentration wastewater containing the particles, can rapidly and effectively remove micron-sized and submicron-sized particle pollutants in the liquid, simultaneously continuously produce concentrated solution, and can remove pollutants in pore channels among filter materials by backwashing the filter materials, thereby prolonging the operation period.
Description
Technical Field
The disclosure belongs to the field of liquid-solid separation, and relates to a filter element-filter material combined cross-flow filtration method for separating fine particles in liquid, which is suitable for separating and concentrating low-concentration fine particles in liquid. The disclosure also provides a filter element-filter material combined cross-flow filter device for separating fine particles in a liquid.
Background
Since the 60 s of the 20 th century, the problem of wastewater reuse has mentioned the agenda due to the serious shortage of water resources. In order to obtain high quality effluent, filtration techniques are widely used for advanced treatment of contaminated (waste) water. Filtration is a common heterogeneous separation method, and a method for separating liquid and solid insoluble in liquid by utilizing the solubility difference of substances can be used in the field of liquid-solid separation. Currently, the main filtering methods are of three types: surface layer filtration, wherein solid particles are intercepted by using the surface of a filter medium or the surface of a filter cake generated in the filtration process, so that solids and liquid are separated; precoating and filtering, namely, pre-coating filter aids such as cellulose, diatomite and the like on the surfaces of a filter tube, a filter disc or a filter plate to form a filter medium containing innumerable capillary channels, so that solids and liquid are separated; depth filtration, which is to say that when the particle size is smaller than the diameter of the medium pore canal, a filter cake cannot be formed on the surface of the filter medium, and the particles enter the medium, approach the pore canal wall surface through inertia and diffusion action, and are deposited under the action of static electricity and surface force so as to be separated from fluid.
The deep filtration is applicable to the medium with low concentration of filtered particles, and the equipment has the advantages of difficult blockage, long service period, simple structure, low cost, high filtration efficiency and the like, and is widely applied to the fields of biological pharmacy, sewage treatment and the like. However, the traditional deep filtration method has the problems of large equipment volume, small filtration area, low bed utilization rate and the like.
Cross flow filtration, also called cross flow filtration, is a type of surface layer filtration and its principle is that feed liquid flows parallel to the membrane surface under the pushing of pressure difference, unlike dead end filtration, the shearing force generated when feed liquid flows through the membrane surface takes away particles retained on the membrane surface, thus keeping the pollution layer at a thinner level. The cross-flow filtration can realize the filtration of feed liquid with solid content higher than 0.5%. With the development of cross-flow filtration technology, there is a trend in many fields to replace dead-end filtration. However, as the cross-flow filtration adopts the filter element with fixed pore canal to realize the filtration of the particulate matters in the materials, when the separation precision is required to be higher, the filter element with higher precision is usually used, and the problem of the blockage of the pore canal of the filter element easily occurs when the medium containing the oil-containing waxy pollutants with complex pollutant components is treated.
Chinese patent application CN116492726 a discloses a method and apparatus for separating filter core from filter material by combining filter core and filter material to increase the filtering area, but because the filter core is reused for dead-end filtration, the problem of filter core blockage is easy to occur when filtering liquid with higher concentration of particulate matters, and the regeneration of the filter material is more frequent.
Accordingly, there is a strong need in the art to develop a combined filter cartridge-filter media cross-flow filtration method for separating fine particles from liquids that overcomes the above-described deficiencies of the prior art.
Disclosure of Invention
The invention provides a novel filter element-filter material combined cross-flow filtering method and device for removing fine particles in liquid, which realize the rapid and efficient removal of low-concentration fine particles in liquid.
In one aspect, the present disclosure provides a cartridge-filter material combination cross-flow filtration method comprising the steps of:
(a) The mixed liquid containing the particulate matters is sent to a filter element-filter material combined cross-flow filter unit, wherein the mixed liquid enters a feed cavity from a feed main pipe of the filter element-filter material combined cross-flow filter unit, is distributed to a plurality of feed branch pipes from the feed main pipe, and is distributed to a plurality of vertically installed separation filter elements from the feed branch pipes;
(b) After the mixed liquid enters the separation filter element, the mixed liquid passes through a cavity in the separation filter element from top to bottom, and passes through the cavity, and simultaneously, under the interception action of the separation filter element and the filter material outside the separation filter element, the liquid phase transversely passes through the pores of the separation filter element and the filter material bed, the solid phase is intercepted by the separation filter element and the filter material bed, most of the solid phase is left on the inner surface of the separation filter element to form a filter cake layer, and a small part of the solid phase is left in the filter material bed;
(c) The mixed liquid passes through the cavity from top to bottom, and simultaneously, a filter cake layer formed on the inner surface of the separation filter element falls off by utilizing the shearing force of the liquid and the inner surface of the separation filter element, and as the liquid phase transversely passes through the pores of the separation filter element, the flow of the mixed liquid in the filter element from top to bottom is gradually reduced, and the concentration of particulate matters is gradually increased, so that the concentrated mixed liquid is obtained;
(d) Concentrated mixed liquid flows out from the lower end of each separation filter element, is collected to a plurality of concentrated liquid branch pipes, is collected to a concentrated liquid main pipe by the plurality of concentrated liquid branch pipes, and flows out from a concentrated liquid outlet;
(e) The filtered clear liquid passes through the separation filter element and the filter material bed layer and then enters a plurality of clear liquid collecting filter elements which are vertically arranged and are parallel to the separation filter element;
(f) After the filtered clear liquid enters a clear liquid collecting filter element, the clear liquid is collected into a plurality of clear liquid branch pipes, and then is collected into a clear liquid main pipe through the plurality of clear liquid branch pipes, and then flows out from a clear liquid outlet; and
(G) After the filtration is carried out for a set time or a set pressure difference, the feeding and clear liquid valves are closed, the regeneration valve, the regeneration air inlet valve and the regeneration discharge valve are opened, and the cleaning of the filter element and the regeneration of the filter material are realized through liquid and gas mixed backwashing, so that the filtration pressure difference is restored to an initial state.
In a preferred embodiment, in step (a), the particulate matter-containing mixture has a solid particle content of 0.01 to 10.0g/L and a solid particle size in the range of 0.1 to 1000. Mu.m.
In another preferred embodiment, in step (b), the flow rate of the mixed liquor passing through the separation filter element from top to bottom is 0.01-3m/s, while the flow rate of the liquid phase flowing transversely through the separation filter element and the filter bed is 0.001-0.02m/s, both processes being carried out simultaneously, and the flow ratio of the clear liquor to the concentrated liquor being controlled by a concentrate outlet regulating valve.
In another preferred embodiment, in the step (g), the pressure loss of the filter element-filter material combined cross-flow filtration unit is 0.02-0.40MPa, and after the pressure difference is higher than the set range, the back flushing is performed by passing filtered clear liquid or clear water to pressurize compressed air, compressed nitrogen or steam.
In another aspect, the present disclosure provides a cartridge-filter media combination cross-flow filtration device for use in the above method, the device comprising:
The vertical container shell is arranged on the feeding main pipe at the upper part of the shell, a plurality of feeding branch pipes connected with the feeding main pipe respectively, a plurality of vertically installed separation filter cores connected with the feeding branch pipes respectively, a filter material bed layer, a plurality of concentrated solution branch pipes connected with the lower end of the separation filter core, a concentrated solution main pipe connected with the concentrated solution branch pipes, a plurality of vertically installed clear liquid collecting filter cores arranged in parallel with the separation filter cores, a plurality of clear liquid branch pipes connected with the lower end of the clear liquid collecting filter core, a clear liquid main pipe connected with the clear liquid branch pipes, a backwash distribution device arranged at the bottom in the shell and a backwash filter material filtering and recycling device arranged at the upper part in the shell or outside the shell.
In a preferred embodiment, the separation filter element and the clear liquid collecting filter element are arranged in parallel and alternately in the vertical direction, two ends of the separation filter element are respectively connected with the feeding branch pipe and the concentrated liquid branch pipe, one end of the clear liquid collecting filter element is plugged, and the other end of the clear liquid collecting filter element is connected with the clear liquid branch pipe.
In another preferred embodiment, the separation cartridge and the supernatant collection cartridge comprise: stainless steel wire-wound filter cores, metal powder sintering filter cores, metal wire sintering filter cores, ceramic filter cores and polymer fiber filter cores with the pore diameters smaller than the diameter of the filter materials or the combination of the stainless steel wire-wound filter cores, the metal powder sintering filter cores, the metal wire sintering filter cores and the ceramic filter cores are vertically arranged on the feeding branch pipe and the clear liquid branch pipe respectively, and are uniformly distributed on the feeding branch pipe and the clear liquid branch pipe.
In another preferred embodiment, the filter material bed layer adopts granular filter materials, the particle size of the filter materials is 0.1-5.0mm, and the filter materials are organic or inorganic materials.
In another preferred embodiment, the filter media filtration recovery device comprises: t-shaped or star-shaped wire-wound pipe water distributors, cloth bag type filter cores, cyclone separators, inertial separators or combinations thereof.
In another preferred embodiment, the concentrated solution branch pipe and the clear solution branch pipe are horizontally arranged at the position of the shell barrel close to the sealing head, the feeding branch pipe is horizontally arranged at the upper part of the shell barrel, and the feeding branch pipes are uniformly staggered in the horizontal direction.
The beneficial effects are that:
(1) The method disclosed by the disclosure combines the filter element separation method and the filter material separation method in series, so that the problem that the separation efficiency of the single filter element and the single filter material filtration method is insufficient for particles smaller than 10 mu m is solved, the defect that the separation capacity of the filter material bed layer for wastewater with higher solid content is also solved, and the two separation methods are mutually complemented.
(2) The method disclosed by the invention utilizes a filter element-filter material combination method to purify the mixed liquid, and the combined action of the filter element and the filter material is used for sieving, intercepting, adsorbing and the like particles in the liquid, so that the content of the particles in the mixed liquid is gradually reduced along with the depth of a filter layer.
(3) Compared with a dead-end filtering method, the method adopts the cross-flow filtering principle, and the method reduces the accumulation of filter cakes on the surface of the filter element by flushing the inner surface of the filter element by stock solution, so that the filtering period is prolonged, the risk of filter element blockage is reduced, and the mixed solution with higher particulate matter content can be filtered, so that the application range is wider.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification.
Fig. 1 is a general flow diagram of a cartridge-filter media combination cross-flow filtration method according to a preferred embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a cartridge-filter media combination cross-flow filtration device according to a preferred embodiment of the present disclosure.
Fig. 3 is a front view of a cartridge-filter media combination cross-flow filtration device according to a preferred embodiment of the present disclosure.
Fig. 4 is a top view of the cartridge-filter media combination cross-flow filtration device of fig. 3 taken along lines A-A and B-B.
Fig. 5 is a schematic diagram of a cartridge-filter media combination cross-flow filtration according to a preferred embodiment of the present disclosure.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The inventor of the application is through extensive and intensive research, in order to traditional cross-flow filtration to realize the filtration of the particulate matters in the material by adopting the fixed filter core of the pore canal, when the separation precision is required to be higher, usually will use the filter core with higher precision, and the problem that the pore canal of the filter core is blocked easily when handling the medium of the complex component of the pollutant and containing the oily waxy pollutant, and CN 116492726A's filter core-filter material combination type micro-channel separation method because the filter core reuse is dead-end filtration, therefore when filtering the liquid with higher concentration of the particulate matters, the filter core blocking problem easily appears, and the filter material regeneration is more frequent defect, the application proposes a filter core-filter material combination type cross-flow filtration method and device for separating the fine particles in the liquid, utilize filter core and filter material combination to realize the high-efficient removal of the fine particulate matters; the filter cake on the surface of the filter element is controlled in a lower range by utilizing the cross-flow filtration principle, so that the operation period is prolonged; the regeneration of the filter material is realized by utilizing water-air backwashing; the filter elements are arranged in a staggered combination way, so that the increase of the filtering area is realized; according to the application, a cross-flow filtration method is adopted, and through flushing of stock solution on the inner surface of the filter element, the accumulation of filter cakes on the surface of the filter element is reduced, so that the filtration period is prolonged, the risk of filter element blockage is reduced, and the mixed solution with higher particulate matter content can be filtered, so that the application range is wider compared with that of CN 116492726A.
The technical conception of the invention is as follows:
The filter element and the filter material are arranged in a specific mode, and the high-efficiency removal of the particles in the liquid is realized through the interception and adsorption of the filter material; the filter cake layer on the upper layer of the filter medium is taken away by utilizing the transverse flow of the fluid on the surface of the filter medium so as to reduce the thickness of the filter cake layer; after the serious blocking flux of the pore canal of the filter material is reduced and the pressure difference is increased, the filter element is cleaned and the filter material is regenerated through water and air mixed backwashing.
In a first aspect of the present disclosure, there is provided a cartridge-filter material combination cross-flow filtration method for fine particle removal in a liquid, the method comprising the steps of:
(a) Pressurizing mixed liquid containing particles and then delivering the pressurized mixed liquid to a filter element-filter material combined cross-flow filter unit, wherein the mixed liquid enters a feeding cavity from a feeding main pipe of the filter element-filter material combined cross-flow filter unit, is distributed to a plurality of feeding branch pipes from the feeding main pipe, and is distributed to a plurality of vertically installed separation filter elements from the feeding branch pipes;
(b) After the mixed liquid enters the separation filter element, the mixed liquid passes through a cavity in the separation filter element from top to bottom, and passes through the cavity, and simultaneously, under the interception action of the separation filter element and the filter material outside the separation filter element, the liquid phase transversely passes through the pores of the separation filter element and the filter material bed, the solid phase is intercepted by the separation filter element and the filter material bed, most of the solid phase is left on the inner surface of the separation filter element to form a filter cake layer, and a small part of the solid phase is left in the filter material bed;
(c) The mixed liquid passes through the cavity from top to bottom, and simultaneously, a filter cake layer formed on the inner surface of the separation filter element falls off by utilizing the shearing force of the liquid and the inner surface of the separation filter element, and as the liquid phase transversely passes through the pores of the separation filter element, the flow of the mixed liquid in the filter element from top to bottom is gradually reduced, and the concentration of particulate matters is gradually increased, so that the concentrated mixed liquid is obtained;
(d) Concentrated mixed liquid flows out from the lower end of each separation filter element, is collected to a plurality of concentrated liquid branch pipes, is collected to a concentrated liquid main pipe by the plurality of concentrated liquid branch pipes, and flows out from a concentrated liquid outlet;
(e) The filtered clear liquid passes through the separation filter element and the filter material bed layer and then enters a plurality of clear liquid collecting filter elements which are vertically arranged and are parallel to the separation filter element;
(f) After the filtered clear liquid enters a clear liquid collecting filter element, the clear liquid is collected into a plurality of clear liquid branch pipes, and then is collected into a clear liquid main pipe through the plurality of clear liquid branch pipes, and then flows out from a clear liquid outlet; and
(G) After the filtration is carried out for a set time or a set pressure difference, the feeding and clear liquid valves are closed, the regeneration valve, the regeneration air inlet valve and the regeneration discharge valve are opened, and the cleaning of the filter element and the regeneration of the filter material are realized through liquid and gas mixed backwashing, so that the filtration pressure difference is restored to an initial state.
In the present disclosure, in the step (a), the solid particle content of the particulate matter-containing mixed liquid is 0.01 to 10.0g/L, and the solid particle diameter ranges from 0.1 to 1000 μm.
In the present disclosure, in step (b), the flow rate of the mixed liquor passing through the separation filter element from top to bottom is 0.01-3m/s, while the flow rate of the liquid phase transversely flowing through the separation filter element and the filter material bed is 0.001-0.02m/s, and the two processes are performed simultaneously, and the flow ratio of the clear liquor to the concentrated liquor is controlled through the concentrated liquor outlet regulating valve.
In the disclosure, in the step (g), the pressure loss of the filter element-filter material combined cross-flow filter unit is 0.02-0.40MPa, and when the pressure difference is higher than a set range, the back flushing is performed by filtering the filtered clear liquid or clear water to compress compressed air, compressed nitrogen or steam.
In a second aspect of the present disclosure, there is provided a cartridge-filter material combination cross-flow filtration device for use in the above method, the device comprising:
The vertical container shell is arranged on the feeding main pipe at the upper part of the shell, a plurality of feeding branch pipes connected with the feeding main pipe respectively, a plurality of vertically installed separation filter cores connected with the feeding branch pipes respectively, a filter material bed layer, a plurality of concentrated solution branch pipes connected with the lower end of the separation filter core, a concentrated solution main pipe connected with the concentrated solution branch pipes, a plurality of vertically installed clear liquid collecting filter cores arranged in parallel with the separation filter cores, a plurality of clear liquid branch pipes connected with the lower end of the clear liquid collecting filter core, a clear liquid main pipe connected with the clear liquid branch pipes, a backwash distribution device arranged at the bottom in the shell and a backwash filter material filtering and recycling device arranged at the upper part in the shell or outside the shell.
In the present disclosure, the concentrated solution branch pipe and the clear solution branch pipe are horizontally installed at the position of the shell cylinder close to the end socket, the feeding branch pipe is horizontally installed at the upper part of the shell cylinder, and the horizontal directions are uniformly staggered.
In this disclosure, separation filter core and clear liquid collect the filter core and are vertical direction parallel alternate arrangement, and separation filter core both ends link to each other with feed branch pipe and concentrate branch pipe respectively, and filter core one end shutoff is collected to the clear liquid, and the other end links to each other with the clear liquid branch pipe.
In the present disclosure, the separation cartridge and the supernatant collection cartridge include: stainless steel wire-wound filter cores, metal powder sintering filter cores, metal wire sintering filter cores, ceramic filter cores and polymer fiber filter cores with the pore diameters smaller than the diameter of the filter materials or the combination of the stainless steel wire-wound filter cores, the metal powder sintering filter cores, the metal wire sintering filter cores and the ceramic filter cores are vertically arranged on the feeding branch pipe and the clear liquid branch pipe respectively, and are uniformly distributed on the feeding branch pipe and the clear liquid branch pipe.
In the method, the filter material bed layer adopts a granular filter material, the particle size of the filter material is 0.1-5.0mm, and the filter material is an organic or inorganic material with adsorptivity to particles or other pollutants to be removed in the mixed liquid; the separating medium can be quartz sand, anthracite, zeolite, shell, active carbon, carbon sphere or ceramic sphere, or can be a combination of various separating mediums, and the content of particles in the liquid is gradually reduced along with the depth of the filtering layer by the screening, interception, adsorption and other actions of the separating medium on the particles in the liquid, so that the mixed liquid is purified.
In the present disclosure, the backwash distribution device and filter material filtration recovery device include: t-shaped or star-shaped wire-wound pipe water distributors, cloth bag type filter cores, cyclone separators, inertial separators or combinations thereof are used for recovering regenerated liquid to carry filter material particles.
In the present disclosure, the liquid and gas for regeneration enter the filter material bed from the backwash distribution device at the bottom, after loosening and fluidizing the filter material bed, the concentrated regeneration liquid carries pollutant particles, and after the pollutant particles intercept the filter material by the top backwash filter material filtering and recycling device, the filter material is sent out by the sending device.
In the present disclosure, the filter element-filter material combined cross-flow filtration device regenerates the filter element-filter material by reverse washing liquid/gas: under the condition of using for a certain time or reaching a certain pressure, the system enters a regeneration stage; in the backwash liquid/gas introducing equipment, innumerable regenerated water vapor is separated from the backwash distribution device, the filter material bed is loosened and fluidized, impurities carried by the filter material are sucked out at high temperature, the impurities are brought to the top backwash filter material filtering and recovering device by backwash water, and after filtration, turbid liquid and waste gas can be discharged to a treatment backwash concentrated liquid/waste gas unit, so that the cleaning of the filter element and the regeneration of the filter material are realized, and the normal operation of the filter element-filter material combined type cross-flow filtering device is ensured.
Reference is made to the accompanying drawings.
Fig. 1 is a general flow diagram of a cartridge-filter media combination cross-flow filtration method according to a preferred embodiment of the present disclosure. As shown in fig. 1, a production flow is being generated, under the closed-loop control of a raw liquid flow meter 1-2A and an inlet valve 1-4, the feeding amount of mixed liquid (raw liquid) is automatically controlled, the mixed liquid enters a device 1 through a feeding branch pipe gate valve 1-10, filtered clear liquid is sent out through a clear liquid discharging switch valve 1-5 through a clear liquid branch pipe gate valve 1-12 (when the filtering effect is poor, the clear liquid discharging switch valve 1-5 is closed, a positive washing liquid discharging switch valve 1-6 is opened, the positive washing liquid is sent to a processing unit), the outlet pressure of concentrated liquid is monitored by a concentrated liquid pressure table 1-3B, under the closed-loop control of a concentrated liquid flow meter 1-2B and a concentrated liquid discharging switch valve 1-2, the discharging amount of concentrated liquid is automatically controlled, and the filtered clear liquid is sent out through a concentrated liquid branch pipe gate valve 1-11; when the system operates for a period of time or the pressure difference between the raw liquid pressure table 1-3A and the clear liquid pressure table 1-3C reaches a certain value, the inlet valve 1-4, the feeding branch pipe gate valve 1-10 and the clear liquid branch pipe gate valve 1-12 are closed, the backwash air inlet 1-7 is opened, the flow is automatically controlled by the backwash air flowmeter 1-2C, the backwash air inlet 1-8 is opened, the flow is automatically controlled by the backwash air flowmeter 1-2D, the last hand valve of the device is opened, the regenerated mixed liquid enters the device, the equipment enters the regeneration stage, the backwash concentrated liquid/waste gas outlet valve 1-9 is opened to discharge backwash concentrated liquid/waste gas to the disposal unit, the normal production flow is recovered after the regeneration period of time or the pressure difference is reduced to a certain value, and the device operates normally.
Fig. 2 is a schematic diagram of a cartridge-filter media combination cross-flow filtration device according to a preferred embodiment of the present disclosure. As shown in fig. 2, the filter element-filter material combined cross-flow filter device mainly comprises: the vertical type container comprises a vertical type container shell 2-8, a feeding main pipe 2-1, a feeding branch pipe 2-2, a separation filter element 2-3, a filter material bed layer 2-4, a clear liquid collecting filter element 2-5, a clear liquid branch pipe 2-6, a clear liquid main pipe 2-7, a concentrated liquid branch pipe 2-15, a concentrated liquid main pipe 2-14, a backwashing distribution device 2-9, a backwashing filter material filtering and recycling device 2-10, a manhole 2-11, a backwashing gas/liquid inlet 2-12 and a backwashing concentrated liquid/waste gas outlet 2-13; during separation operation, the mixed liquid enters a feeding main pipe of the filter element-filter material combined cross-flow filtering unit, is distributed to a plurality of feeding branch pipes by the main pipe, and is distributed to a plurality of vertically installed and horizontally arranged separation filter elements by the feeding branch pipes; the mixed liquid passes through the pores of the separation filter element and enters the granular filter material bed, wherein the liquid phase transversely flows through the filter material bed, and the solid granular phase is left in the filter material bed under the interception and adsorption actions of the filter material bed; the filtered clear liquid passes through the filter material bed layer and then enters a plurality of clear liquid collecting filter elements which are vertically arranged and are parallel to the separating filter elements; after passing through a horizontally arranged separating filter element from top to bottom, the filtered concentrated solution is gathered into a plurality of concentrated solution branch pipes, and then is gathered into a concentrated solution main pipe by the plurality of concentrated solution branch pipes and is sent out; after the filtered clear liquid enters a clear liquid collecting filter element, the clear liquid is collected into a plurality of clear liquid branch pipes, and then is collected into a clear liquid main pipe by the plurality of clear liquid branch pipes and is sent out; during regeneration operation, backwash water/gas enters the device through the backwash gas/liquid inlet, flows through the backwash distribution device to fluidize the filter material bed, and after being filtered by the backwash filter material filtering and recycling device, backwash water/gas carries impurities and is discharged out of the system from the backwash concentrated liquid/waste gas outlet.
Fig. 3 is a front view of a cartridge-filter media combination cross-flow filtration device according to a preferred embodiment of the present disclosure. As shown in fig. 3, the filter element-filter material combined cross-flow filter device mainly comprises: the vertical type container comprises a vertical type container shell 2-8, a feeding main pipe 2-1, a feeding branch pipe 2-2, a separation filter element 2-3, a filter material bed layer 2-4, a clear liquid collecting filter element 2-5, a clear liquid branch pipe 2-6, a clear liquid main pipe 2-7, a concentrated liquid branch pipe 2-15, a concentrated liquid main pipe 2-14, a backwashing distribution device 2-9, a backwashing filter material filtering and recycling device 2-10, a manhole 2-11, a backwashing gas/liquid inlet 2-12 and a backwashing concentrated liquid/waste gas outlet 2-13; during separation operation, the mixed liquid enters a feeding main pipe of the filter element-filter material combined cross-flow filtering unit, is distributed to a plurality of feeding branch pipes by the main pipe, and is distributed to a plurality of vertically installed and horizontally arranged separation filter elements by the feeding branch pipes; the mixed liquid passes through the pores of the separation filter element and enters the granular filter material bed, wherein the liquid phase transversely flows through the filter material bed, and the solid granular phase is left in the filter material bed under the interception and adsorption actions of the filter material bed; the filtered clear liquid passes through the filter material bed layer and then enters a plurality of clear liquid collecting filter elements which are vertically arranged and are parallel to the separating filter elements; after passing through a horizontally arranged separating filter element from top to bottom, the filtered concentrated solution is gathered into a plurality of concentrated solution branch pipes, and then is gathered into a concentrated solution main pipe by the plurality of concentrated solution branch pipes and is sent out; after the filtered clear liquid enters a clear liquid collecting filter element, the clear liquid is collected into a plurality of clear liquid branch pipes, and then is collected into a clear liquid main pipe by the plurality of clear liquid branch pipes and is sent out; during regeneration operation, backwash water/gas enters the device through the backwash gas/liquid inlet, flows through the backwash distribution device to fluidize the filter material bed, and after being filtered by the backwash filter material filtering and recycling device, backwash water/gas carries impurities and is discharged out of the system from the backwash concentrated liquid/waste gas outlet.
Fig. 4 is a top view of the cartridge-filter media combination cross-flow filtration device of fig. 3 taken along lines A-A and B-B. As shown in fig. 4, the filter element-filter material combined cross-flow filter device mainly comprises: the device comprises a vertical container shell, a feeding main pipe 2-1, a feeding branch pipe 2-2, a separation filter element 2-3, a filter material bed layer 2-4, a clear liquid collecting filter element 2-5, a clear liquid branch pipe 2-6, a clear liquid main pipe 2-7, a concentrated liquid branch pipe 2-15, a concentrated liquid main pipe 2-14, a backwashing distribution device, a backwashing filter material filtering and recycling device, a manhole, a backwashing gas/liquid inlet and a backwashing concentrated liquid/waste gas outlet; during separation operation, the mixed liquid enters a feeding main pipe of the filter element-filter material combined cross-flow filtering unit, is distributed to a plurality of feeding branch pipes by the main pipe, and is distributed to a plurality of vertically installed and horizontally arranged separation filter elements by the feeding branch pipes; the mixed liquid passes through the pores of the separation filter element and enters the granular filter material bed, wherein the liquid phase transversely flows through the filter material bed, and the solid granular phase is left in the filter material bed under the interception and adsorption actions of the filter material bed; the filtered clear liquid passes through the filter material bed layer and then enters a plurality of clear liquid collecting filter elements which are vertically arranged and are parallel to the separating filter elements; after passing through a horizontally arranged separating filter element from top to bottom, the filtered concentrated solution is gathered into a plurality of concentrated solution branch pipes, and then is gathered into a concentrated solution main pipe by the plurality of concentrated solution branch pipes and is sent out; after the filtered clear liquid enters a clear liquid collecting filter element, the clear liquid is collected into a plurality of clear liquid branch pipes, and then is collected into a clear liquid main pipe by the plurality of clear liquid branch pipes and is sent out; during regeneration operation, backwash water/gas enters the device through the backwash gas/liquid inlet, flows through the backwash distribution device to fluidize the filter material bed, and after being filtered by the backwash filter material filtering and recycling device, backwash water/gas carries impurities and is discharged out of the system from the backwash concentrated liquid/waste gas outlet.
Fig. 5 is a schematic diagram of a cartridge-filter media combination cross-flow filtration according to a preferred embodiment of the present disclosure. As shown in fig. 5, after the mixed liquid feed enters the separation filter element 2-3, the mixed liquid feed passes through a cavity in the separation filter element from top to bottom, and passes through the cavity of the separation filter element, and simultaneously, under the interception effect of the separation filter element and the filter material bed layer 2-4 outside the filter element, the liquid phase transversely passes through the pores of the filter element and the filter material bed layer, the solid phase is intercepted by the separation filter element and the filter material bed layer, most of the solid phase is left on the inner surface of the separation filter element to form a filter cake layer, and a small amount of the solid phase is left in the filter material bed layer; the mixed liquid passes through the cavity of the separation filter element from top to bottom, and simultaneously, the shearing force of the liquid and the inner surface of the separation filter element is utilized to enable a filter cake layer on the inner surface of the separation filter element to fall off, and as part of liquid phase passes through the pore canal of the separation filter element, the flow of the mixed liquid in the separation filter element from top to bottom is gradually reduced, and the concentration of particulate matters is gradually increased; the filtered concentrated solution passes through a horizontally arranged separation filter element from top to bottom, and the filtered clear solution enters a clear solution collecting filter element.
Examples
The invention is further illustrated below in connection with specific examples. It is to be understood that these examples are illustrative of the present invention and are not to be construed as limiting the scope of the present invention. The test methods in the following examples, in which specific conditions are not specified, are generally conducted under conventional conditions or under conditions recommended by the manufacturer. All percentages and parts are by weight unless otherwise indicated.
Example 1:
In a catalytic cracking process, according to the method of the invention, a filter element-filter material combined cross-flow filtration method experimental device is adopted, and is used for carrying out a separation side line test on reaction wastewater of a methanol-to-propylene (MTP) device containing particles, a small amount of aromatic hydrocarbon and alkane, and the specific operation process and effect are as follows:
1. material properties and related parameters
The waste water of the methanol-to-propylene (MTP) device is a liquid-solid mixture, and the water contains fine particles and a small amount of oily matters (mainly aromatic hydrocarbon and alkane), wherein the water is a continuous phase, and the particles and the oil are dispersed phase media. The experimental device treatment amount: 5m 3/h, operating temperature: 105 ℃, particulate matter content: 100mg/L, average particle size of particulate matter: 2 μm.
MTP waste water purifying device
The device uses twelve filter element separators with the inner diameter of 50mm to be connected in parallel, the separation medium used by the microchannel separator is modified quartz sand with the particle diameter of 0.3-0.5 mm, the interval between filter elements is 300mm, and the treatment capacity is 5m 3/h.
3. Process of implementation
After the wastewater of the methanol-to-propylene device containing a small amount of particles is sent to a filter element-filter material cross-flow filtration separation experimental device for purification, the content of the particles in the clear liquid is reduced to be below 5mg/L and discharged, and the content of the particles in the concentrated liquid is 10g/L-50 g/L; after the continuous operation until the pressure difference of the equipment is increased to 0.4MPa, the regeneration operation is switched, and the regeneration period is 24 hours.
4. Analysis of results
The solid content of the wastewater of the methanol-to-propylene device is reduced from 100mg/L to below 5mg/L by the combination and purification of the cross-flow filtration and separation of the filter element and the filter material, and the average pressure drop of the equipment operation is 0.1MPa; the super-initial separation effect can be continuously maintained after 500 hours of continuous operation and 10 backwashing regeneration operations are carried out during the test period.
The above-listed embodiments are merely preferred embodiments of the present disclosure and are not intended to limit the scope of the present disclosure. Equivalent changes and modifications are intended to be within the scope of this disclosure.
All documents mentioned in this disclosure are incorporated by reference in the present disclosure as if each were individually incorporated by reference. Further, it will be appreciated that various changes or modifications may be made to the present disclosure by those skilled in the art after reading the above teachings, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
Claims (10)
1. A filter element-filter material combined cross-flow filtration method, comprising the following steps:
(a) The mixed liquid containing the particulate matters is sent to a filter element-filter material combined cross-flow filter unit, wherein the mixed liquid enters a feed cavity from a feed main pipe of the filter element-filter material combined cross-flow filter unit, is distributed to a plurality of feed branch pipes from the feed main pipe, and is distributed to a plurality of vertically installed separation filter elements from the feed branch pipes;
(b) After the mixed liquid enters the separation filter element, the mixed liquid passes through a cavity in the separation filter element from top to bottom, and passes through the cavity, and simultaneously, under the interception action of the separation filter element and the filter material outside the separation filter element, the liquid phase transversely passes through the pores of the separation filter element and the filter material bed, the solid phase is intercepted by the separation filter element and the filter material bed, most of the solid phase is left on the inner surface of the separation filter element to form a filter cake layer, and a small part of the solid phase is left in the filter material bed;
(c) The mixed liquid passes through the cavity from top to bottom, and simultaneously, a filter cake layer formed on the inner surface of the separation filter element falls off by utilizing the shearing force of the liquid and the inner surface of the separation filter element, and as the liquid phase transversely passes through the pores of the separation filter element, the flow of the mixed liquid in the filter element from top to bottom is gradually reduced, and the concentration of particulate matters is gradually increased, so that the concentrated mixed liquid is obtained;
(d) Concentrated mixed liquid flows out from the lower end of each separation filter element, is collected to a plurality of concentrated liquid branch pipes, is collected to a concentrated liquid main pipe by the plurality of concentrated liquid branch pipes, and flows out from a concentrated liquid outlet;
(e) The filtered clear liquid passes through the separation filter element and the filter material bed layer and then enters a plurality of clear liquid collecting filter elements which are vertically arranged and are parallel to the separation filter element;
(f) After the filtered clear liquid enters a clear liquid collecting filter element, the clear liquid is collected into a plurality of clear liquid branch pipes, and then is collected into a clear liquid main pipe through the plurality of clear liquid branch pipes, and then flows out from a clear liquid outlet; and
(G) After the filtration is carried out for a set time or a set pressure difference, the feeding and clear liquid valves are closed, the regeneration valve, the regeneration air inlet valve and the regeneration discharge valve are opened, and the cleaning of the filter element and the regeneration of the filter material are realized through liquid and gas mixed backwashing, so that the filtration pressure difference is restored to an initial state.
2. The method according to claim 1, wherein in the step (a), the solid particle content of the particulate matter-containing mixed liquid is 0.01 to 10.0g/L, and the solid particle diameter is in the range of 0.1 to 1000 μm.
3. The method of claim 1, wherein in step (b), the flow rate of the mixed liquor passing through the separation cartridge from top to bottom is 0.01 to 3m/s, the flow rate of the liquid phase flowing laterally through the separation cartridge and the filter bed is 0.001 to 0.02m/s, both processes are performed simultaneously, and the flow ratio of the clear liquor to the concentrate is controlled by a concentrate outlet regulator valve.
4. The method according to claim 1, wherein in the step (g), the pressure loss of the filter element-filter material combined cross-flow filtration unit is 0.02-0.40MPa, and when the pressure difference is higher than the set range, back flushing is performed by passing filtered clear liquid or clear water pressurized compressed air, compressed nitrogen or steam.
5. A cartridge-filter media combination cross-flow filtration device for use in the method of any one of claims 1-4, the device comprising:
The vertical type filter comprises a vertical container shell (2-8), a feeding main pipe (2-1) arranged at the upper part of the shell, a plurality of feeding branch pipes (2-2) connected with the feeding main pipe respectively, a plurality of vertically installed separation filter cores (2-3) connected with the feeding branch pipes respectively, a filter material bed layer (2-4), a plurality of concentrated solution branch pipes (2-15) connected with the lower ends of the separation filter cores, a concentrated solution main pipe (2-14) connected with the concentrated solution branch pipes, a plurality of clear solution collecting filter cores (2-5) vertically installed and arranged in parallel with the separation filter cores, a plurality of clear solution branch pipes (2-6) connected with the lower ends of the clear solution collecting filter cores, a clear solution main pipe (2-7) connected with the clear solution branch pipes, a backwash distribution device (2-9) arranged at the bottom in the shell, and a backwash filter material filtering and recycling device (2-10) arranged at the upper part in the shell or outside the shell.
6. The device of claim 5, wherein the separation filter element and the clear liquid collecting filter element are arranged alternately in parallel in the vertical direction, two ends of the separation filter element are respectively connected with the feeding branch pipe and the concentrated liquid branch pipe, one end of the clear liquid collecting filter element is blocked, and the other end of the clear liquid collecting filter element is connected with the clear liquid branch pipe.
7. The apparatus of claim 5 or 6, wherein the separation cartridge and supernatant collection cartridge comprise: stainless steel wire-wound filter cores, metal powder sintering filter cores, metal wire sintering filter cores, ceramic filter cores and polymer fiber filter cores with the pore diameters smaller than the diameter of the filter materials or the combination of the stainless steel wire-wound filter cores, the metal powder sintering filter cores, the metal wire sintering filter cores and the ceramic filter cores are vertically arranged on the feeding branch pipe and the clear liquid branch pipe respectively, and are uniformly distributed on the feeding branch pipe and the clear liquid branch pipe.
8. The device of claim 5, wherein the filter material bed layer adopts granular filter materials, the particle size of the filter materials is 0.1-5.0mm, and the filter materials are organic or inorganic materials.
9. The apparatus of claim 5, wherein the filter media filtration recovery apparatus comprises: t-shaped or star-shaped wire-wound pipe water distributors, cloth bag type filter cores, cyclone separators, inertial separators or combinations thereof.
10. The apparatus of claim 5, wherein the concentrate manifold and the clear solution manifold are horizontally arranged at the position of the housing cylinder close to the end socket, and the feed manifold is horizontally arranged at the upper part of the housing cylinder and uniformly staggered in the horizontal direction.
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