EP1891266A1 - Procede pour traiter des matieres fibreuses non entrelacees et dispositif de blanchiment - Google Patents

Procede pour traiter des matieres fibreuses non entrelacees et dispositif de blanchiment

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Publication number
EP1891266A1
EP1891266A1 EP06763710A EP06763710A EP1891266A1 EP 1891266 A1 EP1891266 A1 EP 1891266A1 EP 06763710 A EP06763710 A EP 06763710A EP 06763710 A EP06763710 A EP 06763710A EP 1891266 A1 EP1891266 A1 EP 1891266A1
Authority
EP
European Patent Office
Prior art keywords
suspension
plasma
electrode
pulp
bleaching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06763710A
Other languages
German (de)
English (en)
Other versions
EP1891266B1 (fr
Inventor
Helmut Figalist
Werner Hartmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1891266A1 publication Critical patent/EP1891266A1/fr
Application granted granted Critical
Publication of EP1891266B1 publication Critical patent/EP1891266B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/007—Modification of pulp properties by mechanical or physical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating

Definitions

  • the invention is in the field of industrial treatment of fibrous materials.
  • the invention relates to a device for bleaching unwound fibrous materials in a suspension, in particular as pulp or pulp, in or on a treatment volume given by boundary walls, wherein the suspension can be filled or flowed through in the treatment volume.
  • the invention relates to a method for treating unwoven fibers in a suspension, in particular as pulp or pulp, preferably for the operation of the bleaching apparatus according to the invention.
  • One goal in the treatment of unwoven pulps is the bleaching of the pulps.
  • the bleaching of pulp for example, it is, inter alia, a goal that tene in the pulp contained ⁇ lignin to remove or certain "colored" molecular groups ⁇ destroy.
  • This type of treatment leads preference as to a higher degree of whiteness of the pulp.
  • Today's bleaching processes are based on the chemical treatment of the fibrous material.
  • Typical bleaching chemicals are Chlorine, chlorine dioxide, sulphurous acids, extraction with caustic soda, oxygen, hydrogen peroxide and ozone.
  • ⁇ are conditions required by the method used.
  • Modern bleaching methods often use various bleaching stages in which various bleaching chemicals are used, each bleaching stage typi ⁇ cally from a mixing unit and a subsequent re ⁇ action exists storm.
  • the sometimes highly toxic (chlorine dioxide) or highly corrosive acids, alkalis or reagents must be transported in large quantities, stored and after the end of the process also worked up again or ent ⁇ worries.
  • Effectiveness of the bleaching process generally depends on the proper concentration of certain reagents in a fibrous suspension.
  • the effectiveness of the bleaching process depends very much on the concentration of a perhydroxide (HOO " ).
  • a reaction rate depends inter alia on a pH and a temperature of the suspension.
  • a typical value for the temperature is for example 6O 0 C to 7O 0 C and a typical value for a pH is about 10.5.
  • the pH is usually controlled by the addition of additional chemicals such as sodium hydroxide or sodium silicate. Some procedures be ⁇ use pressure and higher temperatures is a necessary residence time in, for example, a reaction tower to reduce.
  • a significant cost factor in a bleaching process depends to a large extent on the type and amount of chemicals used and their further treatment, such as separation or disposal.
  • the invention is based on the object, a tung Vorrich ⁇ and to provide a method available to the on set of chemicals in the bleaching of fibrous materials to reduce the non-interwoven.
  • the object is based on the aforementioned Vorrich ⁇ device according to the invention solved by one with a first Electrode connected high voltage pulse generator with which in the treatment volume and / or in the immediate vicinity of a plasma can be generated. Since the process of plasma generation in the bleaching apparatus is well controllable and has short reaction times, an easy-to-control, improved bleaching process is obtained in a bleaching apparatus.
  • the plasma is generated at a distance of ⁇ 20 cm, preferably ⁇ 10 cm, preferably ⁇ 5 cm, from the treatment volume.
  • the direct treatment of the fibers, preferably pulp fibers, with - preferably cold - plasma generated in the suspension certain radicals. These radicals result in bleaching chemical reactions.
  • the bleaching device for fibrous materials is suitable for the production of paper, paperboard or cardboard and / or the fibrous materials can be fed to such a production process as process material.
  • the treatment volume is suitable for filling or flowing through the suspension, preferably a starting material in paper, paperboard or paperboard production, in particular a pulp to be bleached or a pulp to be bleached.
  • Another preferred embodiment is that at least one second electrode for plasma generation is present.
  • the generated piasm ma or the generated gas discharge can be applied specifically to the suspension or in the suspension.
  • a further gradient of the bleaching result is achieved in that at least one of the electrodes is arranged in such a way that it comes into contact with the suspension when the suspension is filled in or flows through the treatment volume.
  • At least one of the electrodes is arranged such that the plasma is preferably largely generated before ⁇ in a near-surface volume below or above the surface of the filled suspension.
  • the electrodes are formed flat, wherein in particular the second electrode is at least partially submersed in the suspension and / or the first electrode is arranged parallel to the second electrode outside the suspension.
  • Such an arrangement preferably causes a hybrid discharge.
  • the electrodes are planar forms excluded, wherein the first electrode and the second Elect ⁇ rode are arranged parallel to one another in the region near the surface of the suspension.
  • An area ausgestaltetes electrode system the plasma advantageously is, applied at ⁇ play, in the vicinity of a bleaching tub. Flowing the suspension, preferably in the pierher ein Pa ⁇ , on a screen and is thus distributed area, as a bleaching device can be applied to a sheet-like electrode system with advantage.
  • a Begren ⁇ is Zung wall of the treatment volume prepared as an electrode.
  • the apparatus may be configured such that the treatment volume is taltet as a pipeline, in particular a connecting element for the transport of the suspensionavailables ⁇ .
  • a device for transporting the suspension can thus be advantageously used both as a transport device and as a bleaching device.
  • At least one electrode is designed as a plate.
  • the electrodes are arranged as at least two opposite, preferably parallel, plates.
  • At least one electrode is designed as a wire.
  • At least one electrode is staltet as a wire mesh, in particular as a wire mesh ⁇ out.
  • the bleaching apparatus may be prepared in such a way furthermore that at least one electrode as a grid, in particular ⁇ sondere as an array of up healthcarewinklig or obliquely intersecting rods and / or flat strips, is preferably configured in the form of a sieve.
  • the electrodes are at least two opposing, preferably parallel to each other, grid angeord ⁇ net.
  • the electrode arrangement can be used with advantage for a two-sided application of plasma to the suspension curtain.
  • At least one electrode has one or more tips. It is known to occur at the electrode tips with particularly high field strengths, which are used here in an advantageous manner for plasma formation nen Kings ⁇ .
  • an electrode is preferably at least designed as a tube from ⁇ .
  • a discharge opening of the bleaching apparatus expediently opens into the pipe.
  • the suspension in particular the fibers or pulps contained therein, can be bleached by means of the tube designed as an electrode.
  • the bleaching device has a means for injecting gas, in particular air or oxygen, preferably pure oxygen or oxygen with, for example, noble gas as the carrier gas, into the treatment volume. Due to this advantageous arrangement, preferably finely distributed air ⁇ be blown or oxygen or oxygen with a carrier gas such as argon, is flowed into the suspension.
  • gas in particular air or oxygen, preferably pure oxygen or oxygen with, for example, noble gas as the carrier gas
  • a carrier gas such as argon
  • the direct treatment of the suspension or of the dilution water, in particular pulp fibers, with "cold plasma” generates radicals in the suspension or in the dilution water, which cause bleaching chemical reactions in the suspension or in the fibers.
  • the suspension is suitable for the production of paper, cardboard or cardboard.
  • a preferably deposited suspension may be used as a moist or wet leaf.
  • the wet or wet sheet is treated with plasma.
  • high-voltage pulses having a duration of less than 10 ⁇ s are generated between electrodes to produce the plasma or the gas discharge.
  • RF radio frequency
  • the plasma or the gas discharge is applied, in particular during passage through or over a sieve ⁇ device before and / or during the sheet formation on the suspension. It is advantageous here that the plasma or the gas discharge is applied at different locations within a papermaking process.
  • the suspension is brought into contact with the plasma on both sides or treated by means of the gas discharge.
  • the plasma or the gas discharge is used for bleaching the suspension, the pulp or the pulp, in particular in a digester, in a bleaching container or in a conduit.
  • the suspension, the pulp or pulp is brought into contact with at least one electrode for generating the plasma or the gas discharge.
  • the plasma or the gas discharge is generated in the suspension.
  • the plasma immersion directly into the Suspen ⁇ to generate short high-voltage single pulses.
  • the method is applied to various types or states of suspensions.
  • the content of carrier liquid, special into ⁇ water is, in the suspension in the range between 40% and 99, 9%, preferably in the range between 80% and 98% and in particular in the range between 85% and 98%.
  • radicals are generated in the plasma or by means of the gas discharge, which act on the fibers. These radicals trigger bleaching chemical Reaktio ⁇ nen out, replaced by either bleaching chemicals or whose consumption can be greatly reduced.
  • suspensions in a paper, board or board production process in particular at different process stages, to use radicals of different types or compositions.
  • Possible process stages especially in a papermaking process, can be: cooking, painting, bleaching, sifting, pressing.
  • the suspension can be treated with plasma or a gas discharge.
  • screening which is the precursor to sheet formation in a papermaking process, the suspension is preferably treated with a different type of radical than used in cooking.
  • the suspension is Pier within a process stage in a patent or board manufacturing process, radical difference ⁇ Licher type or composition exposed, preferably temporally successively.
  • radical difference ⁇ Licher type or composition exposed, preferably temporally successively.
  • H 2 O 3 ozone
  • H 2 O 2 hydroxyl radicals
  • HO 2 hydroxyl radicals
  • HO 2 hydroxyl radicals
  • HO 2 hydroxyl radicals
  • the plasma or the gas discharge is applied in such a way that as radicals increased ozone (O 3 ) and / or hydrogen peroxide (H 2 O 2 ) is formed.
  • the plasma or the gas discharge is preferably applied during sieving and / or in / in the areal distributed suspension or pulp or pulp or in the forming or formed, still unpressed sheet in such a way that as radicals increased hydroxyl radicals, HO 2 and / or HO 2 "is formed.
  • a generation rate of the radicals and / or the composition of the radicals generated be controlled by influencing an amplitude, a pulse duration and / or a pulse repetition rate of the high voltage pulses. Since the concentration of radicals is generated by an electrical process and thus very easily controllable in real time, such a method is very economical and can be readjusted within a very short time for different treatment results.
  • a concentration of the generated radicals is measured to control and regulate the rate of generation and / or the type of radicals generated.
  • a property of the suspension preferably a quality property, in particular its opacity, gloss, whiteness, fluorescence or color point
  • a feedback message is obtained which allows optimal control of the treatment process.
  • concentration or the property "online” is measured.
  • the repetition rate of the high-voltage pulses at kon ⁇ stant amplitude changed.
  • a further increase in the treatment result, in particular a bleaching result, is achieved by enriching the suspension, the pulp, or the pulp, preferably with oxygen, for bleaching in the plasma-exposed area.
  • a high-voltage pulse duration of less than 100 ns is used in the suspension, in the pulp or in the pulp, preferably for bleaching. Is at ⁇ game as the electrode system of a bleaching device com- pletely inside the suspension arranged, it is due to the high conductivity of the suspension very beneficial to work with small high-voltage pulse durations.
  • a high-voltage amplitude corresponding to at least twice the value, preferably at least three times the value, of a corona threshold voltage the electrodes are applied.
  • the plasma or the Koro ⁇ na-discharge can be a DC corona discharge is produced for the generation and the DC voltage corona discharge is superimposed on the high voltage pulses.
  • the superposition of the high voltage pulses on a DC voltage has the particular advantage that the high-energy high-voltage pulses can start from a very high energy level.
  • a pulse repetition rate between 10 Hz and 5 kHz ⁇ , in particular from the range of 10Hz to 1OkHz, is used.
  • high-voltage pulses having a duration of less than 3 microseconds, preferably less than 1 microseconds, preferably ⁇ less than 500 ns applied.
  • a DC voltage of such a height is used that a stable DC corona discharge is formed in the plasma only in conjunction with überla ⁇ siege high voltage pulses.
  • the DC voltage used is particularly advantageous under the voltage for stable operation without high-voltage pulse superimposition.
  • the total used ⁇ amplitude (DC voltage + pulse amplitude) lies above the static breakdown voltage of the electrode assembly.
  • the amplitude of the high ⁇ voltage pulses is between 10% and 1000% of the DC voltage used.
  • a further increase of a treatment outcome or egg ⁇ nes bleaching process is preferably achieved in that a gas flow is produced perpendicular to the electrode assembly.
  • Impurities formed in the suspension by organic dyes, biocatalytic substances and / or microorganisms and / or other biological material are reduced.
  • Impurities in the sense of the invention are, for example, dissolved organic substances which are undesirable in the suspension or generally in a water system of a bleaching apparatus or a papermaking plant.
  • a reaction of the impurities with chemical aids can lead to the formation of undesired deposits. These deposits can eventually lead to spots and holes in the paper at a papermaking facility.
  • Colored impurities are caused by the dyes used in today's printing process, for example, which are largely water-soluble.
  • a high water solubility of the dyes used, particularly when using waste paper as starting material, resulting in that not even be completely ⁇ can be batht in a flotation process, the dyes.
  • Especially water-soluble red dyes are responsible for that the water takes on a rötli ⁇ che tint which on the end product, preferably ⁇ as a paper, carries over.
  • a high desired whiteness for example in the production of white papers, can not be achieved with colored water. In particular, under conditions of restricted water cycles, an increased increase of the microorganisms contained in the water is generally observed.
  • the dissolved oxygen present in the water is rapidly consumed and this can lead to the formation of anerobic conditions in the water.
  • the microorganisms can then multiply rapidly and metabolic products of these microorganisms, for example, lead to strong odor in the form of hydrogen sulfide and / or organic acids or yeasts and bacteria.
  • metabolic products of the anerobic microorganisms corrosion of plant parts.
  • causes are in particular microorganisms which, inter alia, carbohydrate-splitting enzymes, such as the enzyme cellulase with which, which is decomposed in the papermaking process preferably cellulose as a fiber base and serves as a decomposed, short-chain carbohydrate as food for the microorganisms.
  • carbohydrate-splitting enzymes such as the enzyme cellulase with which, which is decomposed in the papermaking process preferably cellulose as a fiber base and serves as a decomposed, short-chain carbohydrate as food for the microorganisms.
  • adhesive impurities are reduced.
  • dissolved and very finely divided "stickies" from the waste paper pass into the papermaking plant.
  • "Stickies” is a term for small Hotmelt- or adhesive Verunrei ⁇ ments, which later appear as a mistake in the paper or in cardboard as, for example, disturbing stains.
  • the water used for this purpose is heavily contaminated.
  • the stickies in a pulp or fiber suspension as an intermediate and in the general circulation water of a paper manufacturing plant tend to example nenbepositionen to Textilmaschi ⁇ such as felts and wires, as well as deposit on cylinders and rollers.
  • the dilution water is additionally treated with the plasma or the gas discharge before the dilution water is added to the suspension.
  • the dilution water is additionally treated with cold plasma or a gas discharge chemical reactions are triggered in the dilution water or in the fabric suspension formed with the dilution water, which already at an early stage, for example ⁇ in one of the bleaching device upstream stock preparation plant, the quality properties of the later significantly improve the suspension used.
  • the dilution water thus treated can be used in addition to the bleaching of the pulps also for reducing impurities.
  • FIG Air parallel plate or tube assembly with wire overlaid with pulsed high voltage
  • FIG 5 to FIG 10 electrode assemblies and electrode systems for generating corona discharges plate-plate, plate-wire plate, coaxial wire tube, tip plate, multi-tip plate, grid plate (tube), grid lattice arrangements,
  • FIG 11 is a hybrid discharge, wherein one electrode det completely above the medium on the sieve befin ⁇ , whereas the second electrode through the screen itself is formed,
  • FIG. 14 shows a pulsed corona discharge system with a coaxial wire tube, with embedded, finely distributed gas bubbles, so that finest gas beads are present in the discharge region and streamer formation takes place predominantly in the gas bubbles,
  • FIG. 15 shows a schematic representation of a stock preparation plant with plasma reactors
  • FIG. 16 Plasma reactor for a dilution water.
  • the papermaking plant 1 shows a schematic representation of a complex Pa ⁇ pierher einsstrom 1, as used in present-day paper mills. Their construction and the combination of different aggregates are determined by the type of paper, cardboard and paperboard types to be produced as well as the raw materials used.
  • the papermaking plant 1 has a spatial extent of about 10 m in width and about 120 m in length. Per minute, the paper ⁇ produces manufacturing facility up to 1400 m of paper 27. It takes only we ⁇ nige seconds from the first impact of the suspension or of the pulp 39 on the sieving device 9 to the finished paper 27, which is ultimately wound up in a reel 15 °.
  • the Fa ⁇ hydro- 30 is applied together with excipients on the screening device 9 with the wire 10 degrees.
  • the fibers are like on the screen 10 side by side and on each other.
  • White water 23 can flow by means of several Saughunt Schemee 24 ⁇ or sucked. In this way, a uniform fiber composite is formed, which is further dewatered by mechanical pressure in a press device 11 and with the aid of steam heat. The entire papermaking process is essentially subdivided into the areas of substance preparation , paper machine, finishing and equipment.
  • Waste paper and, as a rule, pulp also reach the paper factory in dry form, while wood pulp is normally produced in the same factory and pumped into the material center 3 as a fiber / water mixture, ie a suspension of unvarnished pulp.
  • Waste paper and pulp 30 (see FIG. 2) are likewise dissolved with the addition of water in a fiber trough 35 (FIG. 2).
  • Non-paper components are ⁇ the discharged via different sorting aggregates (not shown here).
  • the mixture of different raw materials are also added here to improve paper quality and increase productivity.
  • the headbox 7 of the papermaking plant 1 distributes the pulp suspension uniformly over the entire sieve width.
  • the paper web 27 still contains about 80% water.
  • Another dewatering process is carried out by mechanical pressure in the press device 11.
  • the paper web 27 is guided by means of an absorbent endless felt cloth between rolls of steel, granite or hard rubber and thereby dehydrated.
  • the white water 23 taken up by the suction chamber region 24 is fed to a sorter 5 in part and returned to another part to a fabric scavenger 17.
  • To the press apparatus 11 joins ei ⁇ ne drying plant. 13
  • the remaining residual water is evaporated in the drying plant 13.
  • Slalom-like the paper web 27 passes through several steam-heated drying cylinders. In the end, the paper 27 has a residual moisture of a few percent.
  • the water vapor produced in the drying plant 13 is sucked off and fed into a heat recovery unit (not shown).
  • a first electrode arranged to the initial region of the screening device 43 of the screening device 9, and a two ⁇ th electrode 44 through the screening apparatus.
  • the electrodes 43 and 44 are arranged such that the surface-distributed fiber suspension 39 extends between them.
  • Fiber suspension 39 can be generated, the electrodes 43 and 44 are connected to a high voltage pulse generator 46.
  • a high-voltage pulse generator 46 With the aid of this high-voltage pulse generator 46, a large-volume plasma with a large cross section and with high power density is produced between the electrodes 43 and 44.
  • a plasma density is homogeneously distributed over the treatment area which is covered by the electrodes 43 and 44.
  • this large-volume plasma with high power density is produced by superimposing intensive, short-lasting high-voltage pulses having a high pulse repetition rate of 1 kHz on a DC corona discharge. With this operation, an externa ⁇ tremely homogeneous, large-volume plasma with a high performance generated without the plasma constrictions known in DC corona discharges.
  • oxygen with argon as the carrier gas in the treatmen ⁇ lung space between the electrodes 43 and 44 are introduced by means of a gas distributor 81st
  • a gas distributor 81st oxygen with argon as the carrier gas in the treatmen ⁇ lung space between the electrodes 43 and 44
  • hydroxyl radicals are particularly aggressive and oxidizing, thereby a bleaching effect is achieved at the only a few seconds in the treatment area between the electrodes 43 and 44 lingering fiber suspension.
  • an electrode system 47, 48 in the press device 11 generates a large-area plasma for the treatment of the paper web 27.
  • the first electrode 47 in the press device 11 is designed as a half-round grid electrode. Through the semicircular Ausges ⁇ taltung the electrode 47 can follow the course of the paper web on a transport roller 12th
  • the second electrode 48 in the press device 11 is designed as a plate electrode made ⁇ and arranged so that the transport roller can be passed between the electrodes 12 and 47 48th
  • the plasma treatment area is optionally also flowed via the gas distributor 81 with the gas line 80 with an oxygen-argon mixture here.
  • the pressing process compresses the paper structure, a strength increases and a surface quality is decisively influenced.
  • the molecular structure of the paper surface is further changed ⁇ changed.
  • the strength of the paper 27 is increased and improved printability.
  • a streamer is a special form of a linearly moving plasma cloud or a developing discharge channel that forms due to the excited high external field strength. An assembly of such streamer takes place within less than 10 ns and merges very quickly into a thermal breakdown channel.
  • Previous arrangements of the electrode systems, with the paper web 27 between the electrodes used for streamer discharge is particularly advantageous, as the paper 27 thereby acts in part as a dielectric barrier, thereby suppressing the transition from the streamer puncture.
  • a raw material 30, in particular pulp is conveyed via a conveyor belt 33 in a Fa ⁇ sertrog 35th In the fiber trough 35, the raw material 30 is mixed with water and pumped via a pipeline 36 into a bleaching trough 37.
  • a first electrode 43 'and second electrode 44' are each designed as a circular planar Git ⁇ terelektrode.
  • the first electrode 43 ' is arranged in the gas space ⁇ of the filled into the bleaching trough 37 pulp fiber suspension 39.
  • the second electrode 44 ' is in ⁇ Neren the bleaching tray 37 is arranged and is thus completeness, ⁇ dig covered by the pulp fiber suspension. 39 Between the two electrodes 43 'and 44', a large-area cold plasma is generated by means of the high-voltage pulse generator 46.
  • the radicals OH “ , HOO " , O, O 3 are preferably produced in the suspension 39. These radicals trigger a bleaching chemical reaction.
  • the high-voltage pulse tension ⁇ generator 46 is operated such that it high voltage pulses with a duration of 1 s between the Elect ⁇ roden 43 'and 44' generated.
  • One for the production of radica- len and ozone in the pulp fiber suspension necessary DC voltage is approximately at some 10 kV to 100 kV.
  • the high voltage pulses are superimposed on the DC voltage to form a total amplitude of a few 10 kV to over 100 kV.
  • the radicals are generated in situ.
  • large total amounts of radicals can be introduced into the suspension 39.
  • the radicals are generated in a finely dispersed manner in the suspension, so that the hitherto necessary expense for mixing chemicals with the suspension can also be reduced.
  • an oxygen-argon mixture which has been treated in a gas distributor 81, is introduced into the bleaching trough 37 via a gas line 80.
  • FIG 3 shows a third embodiment of a Thomasdar ⁇ position of a bleaching vessel.
  • a high voltage electrode 50 is arranged in the middle of the bleaching vessel.
  • Therelyman ⁇ th of the bleaching vessel is as a counter electrode directed 51 Herge ⁇ .
  • Herge ⁇ In the bleaching vessel is a Zellstofffa ⁇ ser suspension 39.
  • a streamer 53 is shown between the electrodes 50 and 51.
  • 59 radicals are produced by streamers in that high-energy electrons with Wassermole ⁇ cules or collide suspension molecules and these dissociate or excite. Upon dissociation, radicals 59 are released immediately, while UV light is produced upon excitation by a subsequent radiant transition. This generated UV light in turn reacts with water molecules and dissociates them.
  • the bleaching vessel shown in FIG. 3 can also be used as a device for the passage of the suspension 39.
  • the device is notadedstal ⁇ as a bleaching vessel tet, but as a kind of tubular reactor, ie without a bottom. With this tube reactor, a passage of the suspension can be carried out with simultaneous plasma generation.
  • these radicals 59 and oxidants 57 directly attack the high-molecular-weight dyes and destroy them to such an extent that the color effect of the molecules is eliminated.
  • Microorganisms which release, for example, carbohydrate-cleaved enzymes, such as the cellulase enzyme, which decompose the cellulose present in the suspension 39 as a fiber base and serve as the decomposed, short-chain carbohydrate for the microorganisms, are also inhibited or completely destroyed.
  • the microorganisms are killed, minimizing cellulase production.
  • concurrent degradation of a catalase can build 2 ⁇ 2 concentration in addition to the radicals, a H. This in turn contributes to the direct cellulase degradation as well as to the sterilization of the microorganisms produced by the cellulase.
  • FIG 4 the voltage profile of the high-tension voltage pulses ⁇ used is shown.
  • the abscissa shows the time in ms and the ordinate the voltage in kV.
  • the units are chosen arbitrarily.
  • a level of about 100 kV DC voltage coincides with the abscissa shown.
  • the illustrated pulse voltage is thus superimposed on the DC voltage.
  • the result is a total amplitude of about 500 kV.
  • the pulses 66 and 67 have a pulse width 62 of less than 1 ⁇ s, wherein the individual pulses 66, 67 have a high rising edge with a rise time 64 and a less steeply sloping edge.
  • the pulse repetition time ⁇ 63 is typically between 10 microseconds and 100 milliseconds.
  • the individual pulses 66, 67 such total ⁇ amplitude that more than the predetermined DC voltage, a predetermined energy density is achieved.
  • the pulse rise time 64 is usually short compared to the pulse drop time. By such a kind of pulses, it is ⁇ sufficient that electrical breakdowns that would lead to spatial and temporal disturbances in the homogeneous plasma density distribution can be avoided.
  • Figures 5 to 10 show further examples of Elektrodensys ⁇ systems for generating corona discharges, preferably in aqueous media, especially for alternative use in the aforementioned embodiments.
  • a plate-plate assembly of a first plate 70a as an electrode and a second plate 70b as an electrode Darge ⁇ provides.
  • the first plate 70a and the second plate 70b are arranged parallel to each other.
  • the first plate 70a forms the high voltage electrode and is connected to the high voltage pulse generator 46 via a high voltage cable.
  • the second plate 70b forms the counter electrode and is connected as ge ⁇ grounded electrode with the high voltage pulse generator 46 in connection.
  • FIG. 70 A corresponding arrangement with specially flat plate electrodes is shown in FIG. Again there are two solid plate electrodes 70a and 70c at a fixed distance with a high voltage electrode 71 in the middle.
  • the high-voltage tion electrode 71 designed as a solid wire and connected to the high voltage output of the high voltage pulse generator 46.
  • the grounded plates 70a, 70c are also in communication with the high voltage pulse generator.
  • FIG. 7 shows a wire-tube arrangement as an electrode system.
  • a cylindrical electrode 72 projects centrally a high ⁇ voltage electrode 71 inside.
  • As the high voltage electrode 71 ⁇ is implemented as a solid wire and connected to the high voltage pulse generator 46 in FIG. 6
  • the cylindrical electrode 72 which is preferably configured as a braid Drahtge ⁇ is grounded and is connected to the high voltage pulse generator 46 in ⁇ compound.
  • FIG. 8 shows a tip-plate arrangement as Elektrodensys ⁇ tem.
  • the example three peaks 73 are connected via a high ⁇ voltage line to the high voltage pulse generator 46.
  • the tips 73 are arranged at right angles to a grounded plate electrode 74.
  • the spacing of the Spitzenelekt- roden 73 to the plate electrode 74 is adjustable and can thus be adapted for different process conditions ⁇ the.
  • FIG. 9 shows an electrode system arrangement comprising 3 plates 70a, 70d and 70e.
  • the first plate 70a which is connected as a high-voltage electrode to the high-voltage pulse generator 46, is arranged centrally between two solid plates 70d and 70e.
  • the plates 70a and 70b are connected via ei ⁇ nen plate connector 70f. Since the plate 70d as a grounded counter electrode is in communication with the high voltage pulse generator 46, the plate 70e above the plate connector 70f also functions as a grounded counter electrode.
  • FIG. 10 shows an electrode system as a grid-grid Anord ⁇ tion.
  • a first grid 75a and a second grid 75b are parallel to one another here.
  • the first Git ⁇ ter 75a here forms the high voltage electrode and is the high voltage pulse generator 46 connected.
  • the second grid 75b forms the grounded counter electrode and communicates with the high voltage pulse generator 46.
  • a hybrid discharge wherein one electrode is fully 75a ⁇ constantly outside a to be bleached pulp 39, and a second electrode 76b fully or partially in the pulp 39 is submerged, is produced with the arrangement in Fig. 11
  • the electrode 76a is designed as a grid electrode and is connected to the high-voltage pulse generator 46.
  • the grounded counter-electrode 76b is also designed as a grid electrode.
  • a first charge cloud 68a is formed.
  • chemically active substances can enter the suspension 39 and eliminate unwanted addition to the bleaching effect contaminants.
  • the charge clouds 68a, 68b, 68c release in the suspension 39 radicals, such as O, OH, HOO, but above all strong oxidants such as ozone and / or H 2 O 2 .
  • these chemically active substances destroy microorganisms such as bacteria and yeasts with high efficiency.
  • a Bleichbot ⁇ tich is shown with a vessel wall 77 in a plan view as another embodiment.
  • a plate or grid arrangement with curved surfaces for adaptation to the vessel walls or use of the vessel walls is used as the electrode.
  • a multiple wire electrode 79 is designed as a concentric electric de, following the course of the vessel wall 77 and is connected to the high voltage pulse generator 46 in connection. It faces two counterelectrodes: on the one hand the vessel wall 77 and on the other hand a plate electrode 78.
  • the high voltage electrode 79 is arranged without contact between the vessel wall 77 and the plate electrode 78.
  • the vessel ⁇ wall 77 and the plate electrode 78 are electrically conductively connected to one another and thus form the earthed counter-electrodes, which are associated with the high voltage pulse generator 46 in connection.
  • a high voltage electrode 50 includes a plurality of electrically connected mitein ⁇ other rod electrodes and is arranged in the near-surface gas space 39 of the pulp such that their rods extend pa rallel ⁇ to the surface.
  • a grounded counter electrode 51 is designed as a solid plate and arranged in distributed over the entire surface equidistant distances to the high voltage electrode 50.
  • 39 charge clouds develop at the boundary layer between air and suspension, as indicated for example by the charge clouds 68d and 68e.
  • the charge clouds also ensure penetration of the chemically active substances into the suspension 39.
  • the suspension 39 is guided in this case in an upwardly open suspension channel 37a.
  • the wall of the slurries ⁇ onskanals 37a is also connected to the counter electrode 51 ver ⁇ .
  • FIG 14 shows a final embodiment, a ge ⁇ pulstes corona discharge system in an aqueous solution of the pulp o- 39.
  • the electrode system is formed similar to the FIG 3 as a coaxial wire tube electrode system.
  • the high voltage electrode 50 is disposed coaxially with the counter electrode 51 forming the vessel wall.
  • very fine gas pearls are introduced into the discharge via a gas line 80 by means of a gas distributor 81.
  • FIG 15 is a schematic illustration of a treatment plant Stoffaufbe ⁇ Ia.
  • a dissolver 90 fibrous materials are suspended in an aqueous binder at the beginning of the stock preparation process.
  • the dissolution apparatus 90 is connected to a chemical addition device 91 via a piping system. Further, the piping between the dissolver 90 and the chemical addition device 91 is connected to a first dilution water inlet 26a.
  • the chemical addition device 91 is connected to a first purification stage 92 via a pipe system.
  • the first cleaning stage 92 is further connected to a flotation stage 93 via a pipe system. Between the first purification stage 92 and the flotation stage 93, a second dilution water inlet 26b is arranged.
  • a second treatment stage 94 closes, connected by a piping system ⁇ , the flotation stage 93 at.
  • the suspension or pulp likewise passes via a pipeline system into a thickening device 95.
  • the thickening device 95 is connected to a bleaching container 96 via a pipeline system.
  • the bleaching container 96 From the bleaching container 96, the suspension or pulp 39 is pumped into a chest 97. From the tub 97, the treatable ⁇ th fibrous materials or the pulp 39 in a further machining process are available.
  • the chemical addition device 5 may add various chemical adjuvants, including bleaches to supplement ei ⁇ nes plasma-generated bleaching effect.
  • dilution water 26 is added at locations 26a and 26b.
  • material resolution of fibrous materials in the dissolution apparatus 3 is preferably carried out with a consistency of up to 17%. Thereafter, the suspension of fibrous materials for the subsequent chemical addition device 91 and the first purification stage 92 with the dilution water 26 at the dilution water inlet 26a is diluted to about 5.8 to 6%.
  • the dilution water 26 is treated at the first dilution water inlet 19a by means of a first plasma reactor 23a with a cold plasma or a gas discharge.
  • a first plasma reactor 23a By treating the dilution water 26 before the actual dilution point at which the dilution water 26 is mixed with the suspension in the pipeline system, certain radicals are generated in the dilution water 26 (OH “ , HOO " , 0, O 3 ).
  • These radicals which come into the stock suspension by the thinners ⁇ planning water 26 already solved at the beginning of the stock preparation process bleaching chemi ⁇ cal reactions in the stock suspension from. They can also mask or eliminate sticky impurities in the fibers.
  • These bleaching chemical reactions or radicals act directly on the fibrous materials and thus provide the desired bleaching result.
  • the pulp suspension between the first cleaning stage 92 and the flotation stage 93 through a second dilution water inlet 26b to about 1 to 1.3% ⁇ ver. Also at the point 26b, the dilution water 26 is treated via a second plasma ⁇ reactor 23b prior to mixing with the suspension with a cold plasma or a gas discharge.
  • the plasma reactors 98a and 98b are preferably arranged in the immediate vicinity of the respective feed points of the dilution water 26, in particular at a distance that the remaining length of tubing to the feed point preferably a few meters, preferably around 50 cm, insbesonde ⁇ re only a few cm, is.
  • the fabric 39 is ⁇ suspension having a consistency of about 1% in a one dickungsvorraum 13 thickened.
  • a further treatment with a kneading disperger, for the reduction of, for example, residual color particles, can optionally be used at this point.
  • FIG. 16 shows, in a first exemplary embodiment, one of the two plasma reactors 98a and 98b known from FIG. 15 in a sectional illustration.
  • the plasma reactor 23 is prepared such that an unimpeded flow of the thinners is ⁇ allows water drying 26th
  • the dilution water flows or falls 26 - is by an intermediate space, which pass through two spaced-apart electrodes 43 "and 44" ge ⁇ - as a free water jet in the direction of flow S, preferably.
  • the first electrode 43 is connected via a high tension ⁇ voltage line with a high voltage pulse generator 46 in combination.
  • a corona discharge or a gas discharge between the two electrodes 43" and 44 is also the second electrode 44 via a

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un dispositif de blanchiment (38) et un procédé pour blanchir des matières fibreuses non entrelacées dans une suspension, notamment sous forme de pulpe ou de pâte fibreuse, dans un volume de traitement défini par des parois de délimitation, ladite suspension pouvant être introduite dans le volume de traitement ou passer à travers ce dernier. Ce dispositif présente au moins une première électrode (43'). Un générateur d'impulsions haute tension (46) raccordé à la première électrode (43') et permettant de produire un plasma dans le volume de traitement ou dans l'environnement immédiat (15) de ce dernier provoque un effet de blanchiment. Par rapport à la technique antérieure, l'invention permet de réduire davantage l'utilisation de produits chimiques lors du blanchiment de matières fibreuses.
EP06763710.8A 2005-06-16 2006-06-14 Procede pour traiter des matieres fibreuses non entrelacees et dispositif de blanchiment Not-in-force EP1891266B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005028046 2005-06-16
DE102005049230A DE102005049230A1 (de) 2005-06-16 2005-10-14 Verfahren zur Behandlung unverwobener Faserstoffe und Vorrichtung zum Bleichen
PCT/EP2006/063209 WO2006134127A1 (fr) 2005-06-16 2006-06-14 Procede pour traiter des matieres fibreuses non entrelacees et dispositif de blanchiment

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EP1891266A1 true EP1891266A1 (fr) 2008-02-27
EP1891266B1 EP1891266B1 (fr) 2014-07-30

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DE (1) DE102005049230A1 (fr)
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DE102006024404A1 (de) * 2006-05-24 2007-11-29 Siemens Ag Verfahren zur Verbesserung der Qualität einer Faser-Suspension
DE102006024405A1 (de) * 2006-05-24 2007-11-29 Siemens Ag Verfahren zur Reduzierung klebender Verunreinigungen bei der Papierherstellung
US9382633B2 (en) * 2012-12-21 2016-07-05 Colorado Energy Research Technologies, LLC Systems and methods of improved fermentation
CN106042113A (zh) * 2016-08-05 2016-10-26 沭阳县旺强木制品有限公司 一种木粉漂白机装置
CN107941897B (zh) * 2017-11-30 2024-01-02 北京市北分仪器技术有限责任公司 一种双极性可控脉冲电晕放电电离源及其离子迁移谱仪

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CA973660A (en) * 1972-05-29 1975-09-02 Thomas Joachimides Treatment of cellulosic matter with active nitrogen
CZ281826B6 (cs) * 1993-10-27 1997-02-12 Masarykova Univerzita V Brně Katedra Fyzikální Elektroniky Přírod. Fakulty Způsob bělení a zvyšování adheze vlákenných materiálů k barvivům
JPH11247098A (ja) * 1998-03-03 1999-09-14 Toppan Printing Co Ltd 紫外線カット紙およびその製造方法
DE19836669A1 (de) * 1998-08-13 2000-02-24 Kuesters Eduard Maschf Verfahren zur Oberflächen-Vorbehandlung von Papier oder Karton
AU2003234058A1 (en) * 2003-05-13 2004-12-03 Stazione Sperimentale Carta Cartoni E Paste Per Carte Method for plasma treating paper and cardboards

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Title
See references of WO2006134127A1 *

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DE102005049230A1 (de) 2006-12-28
WO2006134127A1 (fr) 2006-12-21
ES2520891T3 (es) 2014-11-12
EP1891266B1 (fr) 2014-07-30

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