CN100473444C - Method for regenerating filter fabric and regenerated filter fabric therefrom - Google Patents
Method for regenerating filter fabric and regenerated filter fabric therefrom Download PDFInfo
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- CN100473444C CN100473444C CNB2004800277521A CN200480027752A CN100473444C CN 100473444 C CN100473444 C CN 100473444C CN B2004800277521 A CNB2004800277521 A CN B2004800277521A CN 200480027752 A CN200480027752 A CN 200480027752A CN 100473444 C CN100473444 C CN 100473444C
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D41/00—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids
- B01D41/04—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids of rigid self-supporting filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Nonwoven Fabrics (AREA)
Abstract
An inexpensive highly practicable method of regenerating a spent filter fabric, in which a regenerated filter fabric retains the same pressure loss and collection capability characteristics as those of a new one and with the use thereof in no way limited, can be used at high temperature in chemically very poor environment; and an inexpensive regenerated filter fabric obtained by the method. In particular, there is provided a method (1) of regenerating a filter fabric, comprising at least a fibrillation operation of fibrillating a spent filter fabric and a nonwoven fabric forming operation of converting the fibers resulting from the fibrillation operation to a nonwoven fabric. In this method, (2) a dust removing operation of removing any dust adhering to the fibers resulting from the fibrillation operation may be performed prior to the above nonwoven fabric forming operation. Further, in this method of regenerating a filter fabric, it is preferred from the viewpoint of efficient regeneration that (3) the fibrillation operation be performed by passage through an autofibrillation machine.
Description
Technical field
The present invention relates to regenerate and used the renovation process of filter cloth, and the filter cloth that will use renovation and the regenerated filter fabric that obtains.
Background technology
Most of filter clothes in the past are because of the reason on troublesome poeration or the expense, and in fact major part is all thrown away.But filter cloth may be stained with as harmful substances such as dioxin sometimes because of using.The burning disposal of carrying out or bury is ruined and is handled cost certain manpower and material resources for this reason, and earth environment is not had benefit.For this Background Cause, so urgently need utilizing again effectively to the filter cloth that used.
Had as former filter cloth regeneration technology, wait water or clean medicament to wash the washing renovation process of accompanying dirt off to the filter cloth surface bath that uses.
(for example, the spy opens the 2003-103128 communique).
But above-mentioned method for washing can only be removed and be bonded at the part that filter cloth constitutes the dirt on fiber top layer, will be residual and be penetrated into inner most dirts.Therefore the regenerated filter fabric that utilizes washing and obtain is obviously bigger to the consumption of pressure than new product, and in the result of the test as shown in table 1, with respect to the initial stage pressure consumption (70Pa) of new product, its initial stage pressure consumption is 106Pa.Filter cloth after the regeneration fails to realize the initial stage pressure consumption same with new product as mentioned above.
In addition, because of the residual dirt filter cloth inside of the inside accumulation dirt easily that becomes, thereby this type of utilize washing and pressure consumption that the regenerated filter fabric that obtains becomes rise very fast, the hole is easily stifled.In the result of the test as shown in table 1, though frequent carrying out prevent the backwash that the hole is blocked, using 8 as a child, still with respect to the initial stage pressure consumption (70Pa) of new product, its initial stage pressure consumption is 302Pa.Filter cloth after the regeneration fails to realize the service life same with new product as mentioned above.
And, because of its Kong Yi is blocked,, need frequent the carrying out direction opposite to be blown into air with its circulating direction in order to reduce the pressure consumption, remove the backwash of dirt.And when backwash, the crosslinked meeting between the fiber cloth is temporary transient become a little less than, and then can cause flowing out to Way out under the effect of dirt that (in filter cloth inside) be captured because of the air that contains dust.In the result of the test as shown in table 1, using 8 as a child, the accumulative total waste concentration of outlet is with respect to new product (1.173mg/m
3), its concentration is 2.15mg/m
3As mentioned above, when backwash became frequent, its outlet waste concentration can increase, and the filter cloth after the regeneration fails to realize the capturing efficiency same with new product.
Add the high hydraulic pressure that the filter cloth top layer is born, under above-mentioned frequent backwash, a little less than crosslinked the becoming between the fiber cloth, intensity and degree of drawing are compared with new product and are inferior.
Other filter cloth regeneration technology has, and scribbles the renewable filter cloth (spy opens flat 9-253432 communique, the spy opens the 2001-336054 communique) of heat of solution bonding resin or solvent solubility bonding resin.This type of filter cloth can use heat treated after using or to the solution immersion treatment, simple and effective bonding resin is come along with dirt removed.Therefore pressure consumption after utilizing again and rise time thereof can reach with the new product same degree and, can guarantee capturing efficiency, to constitute fiber harmless, can guarantee intensity.
But because of it is the renovation process that utilizes heating for dissolving or chemical reaction, thus can't be at high temperature or take place easily to use under the environment of chemical reaction, and usability has limitation.
In addition, use special technology that special bonding resin at high price is coated on the filter cloth, and when utilizing again, pass through special separating technology it is removed, so its manufacturing expense is not cheap.Though in addition can be when utilizing filter cloth again from the fiber removal dirt, removing dirt and reach utilizing again of bonding resin itself from bonding resin is very difficult problem.So because of the practicality of the reason regenerated filter fabric of cost etc. very low.
In view of the foregoing, research topic of the present invention is, also guarantee to have with new product filter cloth same pressure consumption after utilizing again and catch performance, and can be at high temperature or easily take place to use under the environment of chemical reaction be not subjected to environmental limitations, the renovation process that uses filter cloth that low price, practicality are high and utilize this method that low-cost regenerated filter fabric is provided.
Summary of the invention
For solving above-mentioned problem, the present invention has adopted the method for following (1)～(12).
(1) filter cloth regeneration method of the present invention comprises at least, separating of breaking of the filter cloth of usefulness is spun handled and will make the nonwoven processing of nonwoven through separating the fiber that spins processing.
Of the present invention separate to spin to handle be meant that the filter cloth that will use splits into the processing of fiber monomer.Nonwoven processing of the present invention is meant that main utilization separated the fiber that spins, and it is made the processing of required nonwoven by wrap up in, twine or fixing, connection etc.
Therefore, through separating the fiber unit of spinning and obtaining,, can separate the dirt of its adhesion effectively no matter be that filter cloth before utilizing again constitutes fiber surface partly or interior section.
By said method, can remove indissociable in aforesaid WATER-WASHING METHOD, as to be penetrated into formation fibrous inside dirt, and then the pressure consumption and the rise time thereof of the filter cloth after the regeneration, catch performance and can reach the degree same with new product.And, there is not the crosslinked situation about dying down of formation fiber that causes because of washing, can guarantee intensity with the same degree of new product.
Moreover, because of nonwoven processing fiber crosslinked becomes firmly, compare, more near the intensity of new product filter cloth with aforesaid WATER-WASHING METHOD.
In addition, handle the renovation process of conciliating the nonwoven processing of spinning the gained fiber, need not to use bonding resins such as aforesaid heating for dissolving or chemical reactivity resin, just can utilize again by separating to spin.So can be at high temperature or easily take place also can utilize under the environment of chemical reaction, like above-mentioned bonding resin filter cloth, environment for use does not have limitation.
And, need not to use the bonding resin of above-mentioned high price, do not need special painting process yet, to compare with the filter cloth of above-mentioned use bonding resin, it utilizes again, and price is low, practicality is high.
(2) or, above-mentioned filter cloth regeneration method of the present invention is also passable, before above-mentioned nonwoven processing, carries out handling separating attached to separating the dust separation of spinning the dust on the fiber of handling gained.That is, this filter cloth regeneration method can be to comprise at least: processing is spun in separating that the filter cloth that will use is broken; Separation is separated the dust separation of spinning the dust on the gained fiber attached to this and is handled; The nonwoven processing that to make nonwoven through the fiber that this dust separation is handled.
In said method, also carry out dust separation after spinning and handle because of separating, so can separate more dirt, acquisition good aeration degree and seizure property.
In addition, become firmly, compare, more near the intensity of new product filter cloth with aforesaid WATER-WASHING METHOD because of the nonwoven processing makes the crosslinked of fiber.
(3) moreover, processing is spun in separating of above-mentioned filter cloth regeneration method of the present invention, for its utilization ratio and be preferably use and separate frame automatically again.
As mentioned above, utilize separating automatically of machinery to spin, can easier eliminating impurities, have and realize the regeneration or even the possibility of regeneration with low cost more simply.
(4) in the above-mentioned filter cloth regeneration method of the present invention, the filter cloth of usefulness preferably is, has added the medicament that decomposes dioxin and origin thing thereof, the filter cloth that uses when the control dioxin adheres to.
Dioxin origin thing of the present invention is meant the precursor of dioxin such as chlorophenol, chlorobenzene.
If use above-mentioned filter cloth, because of the former filter cloth user mode of usefulness, the medicament that is added can decompose the dioxin in the dust laden air and the thing that originates from thereof, reduction dioxin concentration.Therefore, can control the absolute number of the contained dioxin of dirt that contacts with filter cloth, the control dioxin adheres to filter cloth.Adhere to the filter cloth of fiber as above-mentioned control dioxin, separated as the filter cloth of usefulness and spin, and then the regenerated filter fabric that can almost not had dioxin to adhere to.
Therefore, even unserviceable in the past, utilize raw material to use again containing also can be used as with filter cloth of being used under the dioxin environment.Even, reduced and handled used expense of filter cloth and the operation that is stained with dioxin, realized cheapness and the high renovation process of practicality.
(5) in the above-mentioned renovation process, the filter cloth of usefulness is preferably, is main component with the PTFE fiber.
Above-mentioned filter cloth can obtain intensity and the seizure performance is good, the regenerated filter fabric that resistance to pressure or hear resistance are strong.
(6) or in the above-mentioned filter cloth regeneration method, the filter cloth of usefulness is preferably, contain PTFE fiber and inorfil at least.
After above-mentioned filter cloth is reused, separate the inorfil that spins because of containing, it is caught performance and improves.In addition, can save, can efficiently obtain to contain the regenerated filter fabric of inorfil in the expense and the operation of separating the separation inorfil before spinning processing.
(7) regenerated filter fabric of the present invention possesses at least, through separating the filter cloth that spins usefulness separate and spin the seizure layer that fiber is a main body.
(8) in addition, above-mentioned regenerated filter fabric also can possess fixing base cloth of catching layer, that is, above-mentioned filter cloth also can be, has possessed at least through separating to spin seizure layer that the filter cloth of usefulness obtains and fix the regenerated filter fabric that this catches the base cloth of layer.
The intensity that this type of filter cloth, Yin Jibu become more high is even backwash in use also can be kept and the crosslinked intensity of formation fiber more than the new product filter cloth equal extent.
(9) above-mentioned regenerated filter fabric also can be, it is caught layer and spins mixing subsidy fiber formation in the fiber with above-mentioned separating.
Promptly, above-mentioned regenerated filter fabric also can be, at least the filter cloth that has possessed the seizure layer that in separating the fiber that spins the filter cloth gained of usefulness, mixes the subsidy fiber and form, or, possessed the seizure layer and the fixing regenerated filter fabric of catching the base cloth of layer that in separating the fiber that spins the filter cloth gained of usefulness, mix the subsidy fiber and form at least.
This type of filter cloth is because of the mixing of subsidizing fiber obtains intensity and the high regenerated filter fabric of degree of stretching.
(10) above-mentioned filter cloth also can be, catches layer and constitutes with the fiber of nonwoven formation its (the corresponding layer of catching) self.
That is, separate spin the filter cloth gained of usefulness fiber through the seizure layer that nonwovenization obtains, perhaps separate to spin in the fiber that the filter cloth of usefulness has obtained and mix the subsidy fiber, the seizure layer that its nonwovenization is obtained.
(11) in the above-mentioned regenerated filter fabric, the filter cloth of usefulness is a main component for being preferably with the PTFE fiber.
(12) or, in the above-mentioned regenerated filter fabric, the filter cloth of usefulness is preferably, contains PTFE fiber and inorfil at least.
The method of above-mentioned by using (1)～(12), also consume after can having obtained guaranteeing utilizing again and seizure property with new product filter cloth uniform pressure, and, its purposes is not limited to, can be at high temperature or use under the environment of chemical reaction, cheapness easily take place and the filter cloth regeneration method and the regenerated filter fabric of the high usefulness of practicality.
Description of drawings
Fig. 1 is the embodiment flow chart of filter cloth regeneration method of the present invention.
Fig. 2 is the electron micrograph of embodiment of the invention gained regenerated filter fabric.
Fig. 3 is the electron micrograph of new product filter cloth.
The specific embodiment
Below, based on figure and the photo of embodiment, describe the present invention in detail.Fig. 1 is the embodiment flow chart of filter cloth regeneration method of the present invention, Fig. 2 enlarges photos for of the present invention through separating 1000 times of electron microscopes that spin the gained fiber, and Fig. 3 enlarges pictures for the 1000 times of electron microscopes without separating the fiber that spins processing that take with Fig. 2 comparison.
Filter cloth that the present invention is used and regenerated filter fabric are the filter cloth that is used to catch powdered object.Especially in following embodiment be, in burning facility, be fixed on filtration from the filter dust collector of the smog of incinerator ejection, be used for high temperature promptly more than 150 ℃ under the condition, filter to catch and contain dioxin, the filter cloth of the dirt dust of harmful substances such as heavy metal.
Harmful dirt is meant, being filtered as dust in the middle of the dirt of seizure, from environmental protection; the goods and materials that the viewpoint of health is considered to be harmful to, as, because of relevant statutory regulation; limit its discharge rate or human intake's amount, need prevent to disseminate the material of processing when discarded to environment.
Especially, in the middle of harmful dirt, the toxicity assessment height of dioxin is not only environmental criteria, even the supervision of its pollution and removal method are also by specific.In the past, the filter cloth that uses under the dioxin environment was because of can't effectively utilizing, so all take buried processing again.Be directed to this,, then not only help earth environment and can prevent harmful substance accumulating and reduce disposal cost and operation at human body if use filter cloth regeneration method of the present invention in having caught utilizing again of the filter cloth that contains the dioxin dirt with practicality.
And the heavy metal in harmful dirt also all is a problem as the processing method of mercury, cadmium, lead etc. or by environment accumulating in human body.Be directed to this,, then help earth environment and can prevent harmful substance accumulating at human body if use filter cloth regeneration method of the present invention in the utilization again of the filter cloth of having heavy metal with practicality.
It is the seizure layer of main component that filter cloth in the present embodiment and regenerated filter fabric possess at least with the PTFE fiber.The PTFE fiber has preferably resistance to chemical reagents, hear resistance, electric charge retentivity and intensive properties and is applicable to filter and catches layer.On the other hand, the PTFE fiber generates hydrogen fluoride in burning process.Fluoridize the pernicious gas headed by the fluorinated compound of charcoal etc., face the discarded problem identical, so the PTFE fiber belongs to the fiber that especially needs it to utilize again with above-mentioned dioxin.
This PTFE fiber constitutes the filter cloth of catching layer, and the high temperature that can be used as more than 150 ℃ uses with filter cloth, and the heat that scribbles before therefore can catching is melted the high temperature control of dust that bonding resin can't be caught.
The fiber of catching layer can be glass fibre, PPS, polyimides, meta-aromatic polyamide etc. also except the PTFE fiber, or they are mixed into the fiber of PTFE fiber.Especially, the seizure layer fiber after utilizing again is preferably, and is main component with the regenerated fiber, again the fiber of one or more of mixing subsidy chain cloth performance (intensity, degree of stretching or seizure performance).
The subsidy fiber is preferably new product (use) fiber, and concrete having of being fit to use can be used inorfils such as the PTFE fiber that is suitable for regenerated filter fabric or silicon, aluminium, glass fibre.Other subsidizes fiber and preferably constitutes the long or thin fiber of fiber than other.It is mixed in " subsidy fiber mixed processes " described later that the filter cloth of usefulness has utilized the subsidy fiber in the process more.
(renovation process for example)
The filter cloth regeneration method of present embodiment is as Fig. 1, comprising: run well and starting, when stopping, adding medicament and remove harmful dirt composition at incinerator, add the medicament that prevents to adhere or generates and add processing; With reclaim the filter cloth of usefulness from precipitron unloading, to the filter cloth that has separated metal etc. wash, dry water system handles; The filter cloth of usefulness separated to spin to separating of each fiber spin processing; Separating the dust separation of this dust through separating the fiber that spins gained and being stained with handles; The nonwoven processing that the fiber of handling through dust separation is made nonwoven; The fiber of this nonwoven is fixed on the processing in groups of base cloth with needle point method; Fiber through handling is in groups prevented accurately machined fine finishining processing fibre shedding, that improve intensity.Below will describe each processing in detail.
(1 adds chemicals treatment)
Adding chemicals treatment is, in the middle of stove and precipitron running, promptly the filter cloth in using adds the processing of medicament.Specifically comprise: when incinerator runs well, for preventing that harmful dirt from generating and removing harmful dirt and carrying out the processing just often that medicine scatters; With incinerator starting and when stopping, scattering the starting that harmful dirt decomposes remover.Processing when stopping.Handle by this, can reduce the harmful dirt absolute number in the dust laden air, the harmful dirt of control uses filter cloth under the situation of the adhesion of filter cloth.
In the present embodiment, above-mentioned medicament be for can decomposing the medicament of dioxin and dioxin origin material simultaneously, be controlled in through adding adhering to harmful dirt of filter cloth of chemicals treatment, and be below the 3ng-TEQ/g as dioxin.
In addition, adding chemicals treatment is need carry out when producing with the harmful dirt headed by dioxin and the origin material thereof, and this type of harmful dirt need not the processing carried out when not producing.
Processing just often be at cooling tower before precipitron, regular, scatter with spray pattern and to prevent that harmful dirt from generating the processing of agent.For this reason, can prevent in the incinerator operation process generation of harmful dirt of generating with minute quantity, harmful dirt is removed in absorption in precipitron in addition.
Harmful dirt generates and prevents that agent from being, when harmful dirt is gaseous state or solid-state dioxin, is the medicament of main component with the active carbon or the white lime of adsorbable this gaseous state or solid-state dioxin.As " the superior lime CD (trade name) " that use field lime Co., Ltd. to make." TAMAKARUKU (trade name) " that also can use field lime Co., Ltd. to make.The harmful dirt that is scattered generates and prevents that agent from passing through to form the thick harmful dirt of number μ m on the filter cloth in precipitron and removing layer, therefore, can prevent solid dioxin the adhering at filter cloth of harmful dirt.
Processing when starting stops is when the incinerator starting stops, and scatters the processing of harmful dirt decomposition remover of medicament in the mode of spraying to cooling tower, flue and precipitron.By this processing dust laden air institute is become harmful dirt decomposition through whole paths and remove layer, the harmful dirt of decomposition and the thing that originates from thereof.Be specially, pass through 300/Nm
3The dioxin and the origin thing thereof of high concentration 300 ℃ of following conditions, that generate when stopping in the incinerator starting are decomposed in the spraying of degree in flue, precipitron.
At this, described starting is to be comprised in the part of incinerator and precipitron duration of runs when stopping.The concrete period is, for more large-scale burning facility, is meant the time period of the hardware check that common about every three months carries out, and for smaller burning facility, is meant that per 7 or 10 days degree carry out the time period that shuts down once.
Dioxin origin material is meant the precursor of dioxin such as chlorophenol, chlorobenzene.The precursor of these dioxin is that the dioxin secondary that generates dioxin outside incinerator generates the origin thing.
Harmful dirt decomposes remover, as " ASYONAITOMATIRU A (trade name) " of chestnut field Co., Ltd. manufacturing.When the harmful dirt that is scattered decomposes remover and decomposes the dioxin of gaseous state and solid-state harmful dirt, decompose the generation that dioxin origin thing prevents harmful dirt.Therefore, when preventing the increase of the dioxin in the dust laden air, reduce the concentration of dioxin and dioxin origin thing self.And then prevent the accumulation of these things and adhering to filter cloth.
(2 washings are handled)
Washing is handled and to be, sloughs the filter cloth that has used from precipitron, carry out the separation of metal etc. after, put into water by the filter cloth that will use, the clean processing of dirt that can simple separation.Be preferably, mixed interface activating agent in the water of use is with chemical mode sorption eliminating impurities.Be specially and use the washing of double drum type rinsing machine, drying.
The filter cloth that has used is meant, fixing filter cloth can't be brought into play filter cloth as the effect of filter cloth because of continuous use on the precipitron under state fixing on the precipitron.Be meant that specifically the w as a result that when carrying out the backwash by forced air combustion fumes is filtered control of dust is the state that solid dirt is stacked into filter cloth inside.Refer to venting quality 1cc/cm in addition
2/ sec following or running in pressure consumption be that 1800Pa is above, cause the filter cloth of the state that a part of mesh is blocked at least, also refer to, catch the filter cloth of performance self problem by visual and definite surface or inner breakage or fiber avalanche etc.This seizure performance self problem is meant that leak has appearred at least a portion, the state that the waste concentration that exports during running becomes very severe.As, because of using for a long time, the part of filter cloth fluffs, and the state of the filter cloth adjunct emersion that waits from the metal (guard ring) that keeps shape also comprises, because of crosslinked the relaxing or the state of breach of fiber appears in a filter cloth part of using serious contraction.The common high temperature control of dust that utilizes precipitron then 5 months to 5 years degree continuous running and become and use filter cloth, especially the filtration of the smog of incinerator then, 3 years to the running of 5 years degree and become the filter cloth of usefulness.
This type of washing drying that has the chemical mode separation is than under the state that is fixed on the precipitron, by the wash degree height of forced air backwash.And carry out before spinning processing because of separating, make to utilize and separate the dirt separation of the spinning processing high efficiency that becomes in aftermentioned.But, because of the enough hydraulic pressure part beyond to the filter cloth top layer can't be provided, so be not properly cleaned the dirt that constitutes fiber only attached to inside.
(3 separate spin processing)
Separating and spinning processing is to separate to spin by the filter cloth that will use to be each fiber, separate to constitute fibrous inside, when being clipped in the dirt between the fiber, the physical pressure when spinning and apply methods separation such as impacts, vibration with the processing of static behaviour attached to the dirt of each fiber by separating.Therefore can obtain high performance regenerated filter fabric simply, at an easy rate, the regeneration with practicality becomes possibility.Separating in the present embodiment spun to be treated to by separating frame automatically and undertaken.
Automatically separate frame and be meant, carry out automatically with the power beyond manually fiber disintegration separate frame, promptly refer to, except only with the frame of separating manually.Specifically be to send to and separate frame with separating filter cloth before spinning; Separating of the filter cloth of sending to spun; And passing through manual power in addition, perhaps manual and manual power is in addition finished continuously.As, the universe formula of use combing roll forming formula etc. is separated frame automatically, till fiber block does not exist, obtains the long 10～50mm of fiber by separating frame automatically repeatedly, is preferably the fiber that respectively disintegrates of 20～40mm.The combing roll forming can be roll formings arbitrarily such as the roll forming of pin sword, garnet roll forming.
Carry out this and separate when spinning processing, also can be added on the subsidy fiber that mixes in the aftermentioned subsidy fiber mixed process, will separate to spin to handle and carry out simultaneously with subsidy fiber mixed processes.
(processing of 4 dust separation)
Dust separation is handled the known dust separation machine that is to use, and separation is attached to the processing of the dirt of each fiber of Xie Fanghou.The separation known machine has, " hundred sounds reach remover " that mechanical Co., Ltd. makes on " the Wal gram force that " that " close Krona of match Ba Erte (trade mark) (MS-1) ", Osaka machine worker Co., Ltd. that makes as the close Krona Co., Ltd. in thin river makes, the pond etc.Also can use the universe formula separator of the wet separation device of above-mentioned water scrubber etc. and vibration bearing separate mode, airflow diversion mode etc.By the fiber of separating after spinning being carried out dust separation, the accompanying dirt of further high efficiency separation unit fiber.Therefore, separated backwash and the renovation process that passes through washing in the past dirt that can't clean, that be accumulated in filter cloth inside.In addition, dust separation is handled also and can be finished by washing.
(5 nonwoven processing)
The nonwoven processing comprises, separates the fiber that spins to the quilt of majority and mixes the subsidy fiber mixed processes of subsidy fiber and these fibers are formed the chemical industry preface as the film that the seizure layer of regenerated filter fabric is shaped.
Subsidy fiber mixed processes is, the fiber that the fiber after mixing ratio is separated and spun is long makes the strong of each fiber crosslinked change each other after the nonwovenization, improves the intensity of the seizure layer that utilizes again and the operation of degree of stretching.Be specially, 50～70 fiber is long, and the subsidy fiber of diameter 5～20 μ m is with weight 20～70%, and 30～60% the degree of being preferably is evenly added.
The material of subsidy fiber is, be in the present embodiment and utilize again before the identical PTFE fiber of seizure layer, use and be not used as the new product fiber that filter cloth was used.In addition, the subsidy fiber also can be the material different with catching layer in useful life is fit to scope, as the inorfil (silicon, aluminium, glass fibre etc.) than PTFE fiber minor diameter.By this subsidy fiber mixed processes, the crosslinked of seizure layer after utilizing again becomes strong.More by combined fiberglass, can improve electrostatic efficiency, the capturing efficiency after utilizing again also can improve.
The fibrousness of subsidy fiber is 1～15dtex, is preferably 3～10dtex, fibrousness 1dtex less than the subsidy fiber less, and the pressure consumption of the above subsidy fiber of 15dtex is bigger.By the less subsidy fiber of composite fibre diameter, to catch all fiber diameter of layer and diminish, pressure consumption reduces.
The film forming process is will separate the fiber that spins and subsidy fiber as required to twine mixedly mutually, makes the regeneration filter course of desired shape.Desired filter course is meant, can bring into play the shape of catching layer effect as tabular, sheet, laminar etc.Except using the compression roll forming to be compressed into the cassette of the laminar overlapping manufacturing in back, to attract by air can also use known shaping processing such as copying master mode the air type of sheet.In order to prevent static and friction, can add finish etc. during shaping.
(6 handle in groups)
Handle being meant in groups, utilize needle point method,, catch the fixing operation of layer along this with the groups of fibers of shapingization seizure layer of forming and the base cloth that improves intensity and degree of stretching.Perhaps, as required, need not with base cloth etc. along the limit, the seizure layer that the groups of fibers of shapingization is formed carries out the processing of acupuncture separately.By acupuncture, constitute crosslinked between the fiber of groups of fibers and become strong, in addition, carry out along the limit under the situation of acupuncture with base cloth, its intensity and degree of stretching have tremendous raising.
Base cloth is preferably and catches the PTFE of layer with material.The PTFE system then has good hear resistance, drug resistance, and also has high-purity after utilizing again.In addition, if use base cloth unlike material or that sneaked into unlike material reduces cost when then can guarantee necessary strength.In addition, more than the intensity 100N/cm width of cloth, degree of stretching is preferred below 40%.
(7 fine finishining processing)
Fine finishining is treated to the fixedly processing of the form of the regenerated filter fabric of bonded fabricization.Arbitrarily carry out as required.Be specially, comprise, with the process of resin operation on process of resin surface and the heat treatment step of heat-treating.
The process of resin operation is, to the seizure laminar surface adhered resin of shapingization, prevents the random operation that the seizure pull-up of each fiber after utilize again falls.Adhering to processing except invading bubble can also be known methods such as spraying coating, coating liquid resinous dip-coating.
Heat treatment step is 200～300 ℃ the heat treatment step that carries out for the form of stable regeneration filter cloth, purposes such as uses arbitrarily to carry out according to high temperature.The fiber that takes place in the time of can preventing that by this processing regenerated filter fabric is used under the high temperature more than 150 ℃ bursts apart.
(feature of end product)
Below will set forth the feature of the regenerated filter fabric of the present invention that utilizes above-mentioned renovation process and regenerate.Regenerated filter fabric of the present invention possesses at least, through separating the filter cloth that spins usefulness separate and spin the seizure layer that fiber is a main body.Or, possessed at least through separating and spun the regenerated filter fabric of the filter cloth of usefulness seizure layer that obtains and the base cloth of fixing this seizure layer.
The filter cloth of usefulness contains the PTFE fiber at least, and being preferably with the PTFE fiber is main component.Or be preferably and contain PTFE fiber and be inorfil at least.
Catching the preferred of layer is the fiber of nonwovenization for constituting the fiber of catching layer.The fiber of constitute catching layer self is for to spin fiber be main body through separating separating of spinning that the filter cloth of usefulness gets.This constitutes the fiber of catching layer also can be to spin the fiber that fiber mixing subsidy fiber constitutes to above-mentioned through separating.
Base cloth is in order to ensure body maintenance, intensity, the degree of stretching of catching layer, is fixed on as required to catch layer.When mixing the subsidy fiber by catching layer, nonwoven seizure layer constitutes fiber etc., when reaching the intensity that needs, not as the requisite item requirement.
That is, the formation state as the regenerated filter fabric that reaches the intensity that needs has following two states.Separate the fiber that spins the filter cloth gained of usefulness and mix the subsidy fiber, its nonwovenization is obtained catching the regenerated filter fabric that layer constitutes, or separate the fiber that spins the filter cloth gained of usefulness regenerated filter fabric through the nonwoven formation.
In addition, as the state of the intensity of better guaranteeing to be fit to, have to possess to understand and spin the fiber that the filter cloth of usefulness obtains and mix the seizure layer and fixing regenerated filter fabric of catching the base cloth of layer that the subsidy fiber constitutes.
Regenerated filter fabric of the present invention was spun because of once separating, so incessantly on the surface of catching layer, its thickness direction forms thicker fibrillation layer also approximately equably by fibrillation.
Fibrillation approximately uniformly described herein is meant as shown in Figure 2, according to visualization, with respect to per 1 the dried fiber before the branch, the state of the fiber branch below 10 is arranged.
Fig. 2 enlarges photo for 1000 times of electron microscopes through separating the fibrillation fiber that spins gained of the present invention, reference as a comparison, Fig. 3 be for Fig. 2 comparison photograph spin processing without separating, 1000 times of electron microscopes that do not carry out the fiber of fibrillation enlarge photos.
Regenerated filter fabric of the present invention is the regeneration gains that adhere to the filter cloth of dirt because of use, also can residual some dirts by renovation process of the present invention.Be specially, can residual 1g/m on the seizure layer of regenerated filter fabric
2The dirt of following degree is to I haven't seen you for ages residual mg/m
2Above dirt.Though but the residual fraction dirt, initial stage throughput and the same degree of new product filter cloth, it is no problem that actual use is gone up.Result of the test as shown in table 1, the 135Pa after the use in 8 hours also is the value that can use in practice fully.
The fiber length through separating the fiber that spins gained of regenerated filter fabric of the present invention is 20～40mm.The longest also below the 50mm.This is by separating the mechanical constraint of frame automatically.
The mesh amount of filter cloth (total mesh amount of the filter cloth that base cloth and seizure layer constitute) is 300～1000g/m
2(filter cloth that base cloth is especially arranged is 400g/m to degree
2More than), be preferably 600～800g/m
2
The regenerated filter fabric of present embodiment is to separate by the mechanicalness of separating frame automatically to spin, as shown in Figure 2, and approximately equably by fibrillation.This by separating of fibrillation spin fiber through crosslinked by nonwovenization, so, with 400g/m
2The low mesh amount of degree also can obtain desired catch rate.Therefore, can obtain a large amount of regenerated fibers, reduce, can access low-cost regenerated fiber by raw-material cost with a spot of fibrillation amount.
On the other hand, catch the mesh amount of layer at 500g/m
2More than, 700g/m more preferably
2When above, can obtain the regenerated fiber of the high mesh amount that the even fibrillation fiber by high mesh amount constitutes, the dirt in the particulate that can't catch before can catching footpath.Or, catch under the relatively thinner situation of layer thickness also can the controlled pressure loss time, guarantee high catch rate.Therefore can obtain low-cost regenerated fiber.
In addition, separate the part of spinning fiber, many than the fiber bodies parts of fine through fibrillation.Therefore, the pressure consumption of fibrillation part is below evaluated error, than the seizure layer of only using without the fiber formation of fibrillation, capturing efficiency height.
The seizure layer of the regenerated filter fabric of present embodiment, not only on the surface of catching layer, to the approximately even fibrillation of its thickness direction, as, the fibrillation layer in table does not form the phenomenon of tomography, does not have situation about descending because of the inertia catch rate by the air of the different layers between the fibrillation layer in its table yet.Therefore, can realize that dirt effectively catches, have good capturing efficiency.
The concrete formation of various piece of the present invention, comprise machinery and method, be confined to the foregoing description incessantly, as long as be at least have separate spin processing then as the medicament of above-mentioned embodiment add handle, washing is handled, dust separation is handled, processing and fine finishining processing or the like can be selected arbitrarily by the purposes of filter cloth in groups, the processing stage of can being combined to each of renovation process according to necessity.Same, can add other processing according to the purposes of regenerated filter fabric.In the scope that does not break away from main idea of the present invention, can carry out the combination of various distortion and each engineering.
(comparative test)
Carried out following comparative test at embodiments of the invention 1.Comparison other is a comparative example of only washing processing in the renovation process of new product filter cloth and embodiment 1.
Embodiment 1
The embodiments of the invention 1 that are used for comparative test are, be recovered in and used on the TQPJ type filter dust separator that the close Krona Co., Ltd. in thin river makes 6 months, it is fibroplastic with PTFE to catch layer and base cloth, the filter cloth BF-800 that Hosokawa Micron KK makes, after the scrubber washing, dry (washing is handled), it is separated frame automatically with the universe formula that Hosokawa Micron KK makes, under the fast 500rpm of revolution, liberate into the fiber (separate and spin processing) below the 40mm, with its MS-1 that makes with Hosokawa Micron KK, eliminating impurities under the rotating speed 2100rpm of rotor (dust separation processing), it being used roller card film shapeization (nonwoven processing) on the market, is the 750N/5cm width of cloth with needle point method with intensity more again, degree of stretching is the filter cloth that 25% the base cloth thickness that obtains fixed thereon is 1.3mm.
(comparative example 1 (new product filter cloth))
The new product filter cloth of comparative example 1 is the filter cloth BF-800 that Hosokawa Micron KK makes.
(comparative example 2 (regenerated filter fabric that the method for washing with water obtains)
Comparative example 2 is the filter cloth that does not carry out dust separation processing, nonwoven processing, combined treatment and fine finishining processing in the foregoing description 1.
(content of comparative test and measurement result)
In the comparative test, be benchmark with German VDI3926, measured initial stage venting quality, final venting quality, outlet waste concentration, condition determination is, rate of filtration 3.0m/min, and the waste concentration of inlet is 5.0g/m
3, dirt is JIS10 kind (floating dust).In addition, when venting quality reaches 1000Pa, blow forced air at any time, carry out backwash, turn round continuously with 8 hours test periods.
The initial stage venting quality is the venting quality after the finger to finger test at the beginning.Final venting quality is meant the venting quality after 8 hours test period.The outlet waste concentration is meant in 8 hours running, and the total amount of contaminants that obtains in outlet is removed the value in 8 hours total blast volume.Result such as table 1.
Table 1
| Measured value | Embodiment 1 (regenerated filter fabric of the present invention) | Comparative example 1 (new product filter cloth) | Comparative example 2 (the regenerated filter fabric of WATER-WASHING METHOD |
| Initial stage venting quality (Pa) | 70 | 70 | 106 |
| Final venting quality (Pa) | 135 | 122 | 302 |
| Outlet waste concentration (mg/m 3) | 0.812 | 1.173 | 2.15 |
As known from Table 1, the initial stage venting quality of the regenerated filter fabric of embodiments of the invention 1 is 70Pa, shows the pressure consumption identical with new product filter cloth (70Pa).This means that renovation process of the present invention can obtain the regenerated filter fabric dirt separation performance, that have practicality with new product filter cloth equal extent.In addition, compare, obviously have a large amount of dirts separated with the regenerated filter fabric (106Pa) of the comparative example that only washes with water.
In addition, the pressure consumption when using in 8 hours is 135Pa, though compare numerically greatly slightly, is not to be blocked easily with new product filter cloth (122Pa) in practicality, has and the life-span of new product filter cloth with degree.Compare then with the regenerated filter fabric of comparative example, embodiments of the invention 1 obviously are difficult for stifled, as regenerated filter fabric, and long service life.
In the measurement result shown in the table 1, the outlet waste concentration of embodiment 1 is 0.812mg/m
3, not only be higher than comparative example (2.15mg/m
3), than new product filter cloth (1.173mg/m
3) also high, shown high seizure.Its reason may be because of as shown in Figure 2, the result of fibrillation.
The possibility of utilizing in the production
Filter cloth regeneration method of the present invention and regenerated filter fabric are used in, such as the filter dust separator in the waste incineration field etc. In addition also be applicable to, be connected to pulverizer, grader, drying machine, coatings tank, pitch facility, build on room and the various stoves etc., from the various filtration controls of dust that air is carried, the powder manufacturing begins.
Claims (11)
1, a kind of filter cloth regeneration method is characterized by, and comprises at least separating of breaking of the filter cloth of usefulness spun handling and will spinning the nonwoven processing that the fiber of handling gained is made nonwoven through separating.
2, filter cloth regeneration method as claimed in claim 1 is characterized by, and comprises before above-mentioned nonwoven processing, is used to separate attached to separating the dust separation of spinning the dust on the fiber of handling gained handle.
3, filter cloth regeneration method as claimed in claim 1 is characterized by, and separates to spin processing and undertaken by separating frame automatically.
4, filter cloth regeneration method as claimed in claim 1 is characterized by, and the filter cloth of usefulness is to have added the medicament that decomposes dioxin and origin thing thereof simultaneously, the filter cloth that is used when the control dioxin adheres to.
5, filter cloth regeneration method as claimed in claim 1 is characterized by, and the filter cloth of usefulness is a main component with the PTFE fiber.
6, filter cloth regeneration method as claimed in claim 1 is characterized by, and the filter cloth of usefulness contains PTFE fiber and inorfil at least.
7, a kind of regenerated filter fabric is characterized by, have at least based on through separating the filter cloth that spins usefulness separate the seizure layer that spins fiber, described seizure layer is to constitute by the fiber that constitutes himself is carried out nonwovenization.
8, regenerated filter fabric as claimed in claim 7 is characterized by, and has to be used for fixing the base cloth of catching layer.
9, regenerated filter fabric as claimed in claim 7 is characterized by, catch layer by above-mentioned separate to spin mix the subsidy fiber in the fiber and constitute.
10, regenerated filter fabric as claimed in claim 7 is characterized by, and the filter cloth of usefulness is a main component with the PTFE fiber.
11, regenerated filter fabric as claimed in claim 7 is characterized by, and the filter cloth of usefulness contains PTFE fiber and inorfil at least.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003352123 | 2003-10-10 | ||
| JP352123/2003 | 2003-10-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1856348A CN1856348A (en) | 2006-11-01 |
| CN100473444C true CN100473444C (en) | 2009-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800277521A Expired - Fee Related CN100473444C (en) | 2003-10-10 | 2004-05-24 | Method for regenerating filter fabric and regenerated filter fabric therefrom |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20080229564A1 (en) |
| JP (1) | JPWO2005035098A1 (en) |
| KR (1) | KR100818866B1 (en) |
| CN (1) | CN100473444C (en) |
| WO (1) | WO2005035098A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101474516A (en) * | 2008-12-24 | 2009-07-08 | 天津渤海化工有限责任公司天津碱厂 | Cloth bag recovery method of lime burner powder precipitator |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE793479A (en) * | 1972-06-20 | 1973-04-16 | Rudloff Bernard | DEVICE FOR OPENING AND INDIVIDUALIZING TEXTILE OR SIMILAR FIBERS |
| US3873411A (en) * | 1973-06-29 | 1975-03-25 | Johnson & Johnson | Methods of recovering reusable fibers |
| DE4424805C1 (en) * | 1994-07-14 | 1995-08-24 | Daimler Benz Ag | Two-part automotive dust filter frame |
| JP3660940B2 (en) * | 1996-03-25 | 2005-06-15 | 独立行政法人産業技術総合研究所 | Recyclable filter and its regeneration method |
| US6010785A (en) * | 1998-02-25 | 2000-01-04 | E. I. Du Pont De Nemours And Company | Cardable blends of dual glass fibers |
| JP2001336054A (en) * | 2000-05-24 | 2001-12-07 | Toray Ind Inc | Recyclable nonwoven fabric structure |
| JP2002066222A (en) * | 2000-09-01 | 2002-03-05 | Osaka City | Air filter |
| JP4953535B2 (en) * | 2001-09-28 | 2012-06-13 | ホソカワミクロン株式会社 | Filter cleaning apparatus and granulation apparatus provided with the same |
-
2004
- 2004-05-24 US US10/572,992 patent/US20080229564A1/en not_active Abandoned
- 2004-05-24 KR KR1020067006111A patent/KR100818866B1/en not_active IP Right Cessation
- 2004-05-24 WO PCT/JP2004/007083 patent/WO2005035098A1/en active Application Filing
- 2004-05-24 CN CNB2004800277521A patent/CN100473444C/en not_active Expired - Fee Related
- 2004-05-24 JP JP2005514524A patent/JPWO2005035098A1/en active Pending
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|---|---|
| KR20060069869A (en) | 2006-06-22 |
| KR100818866B1 (en) | 2008-04-02 |
| WO2005035098A1 (en) | 2005-04-21 |
| CN1856348A (en) | 2006-11-01 |
| US20080229564A1 (en) | 2008-09-25 |
| JPWO2005035098A1 (en) | 2007-11-15 |
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