EP1727935A1 - Vorrichtung und verfahren zur reduzierung eines dampfverlustes in einem geschlossenen system - Google Patents
Vorrichtung und verfahren zur reduzierung eines dampfverlustes in einem geschlossenen systemInfo
- Publication number
- EP1727935A1 EP1727935A1 EP05700813A EP05700813A EP1727935A1 EP 1727935 A1 EP1727935 A1 EP 1727935A1 EP 05700813 A EP05700813 A EP 05700813A EP 05700813 A EP05700813 A EP 05700813A EP 1727935 A1 EP1727935 A1 EP 1727935A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- steam
- screw
- gas
- solid
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 61
- 239000007787 solid Substances 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 35
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000011261 inert gas Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 43
- 239000010893 paper waste Substances 0.000 claims description 19
- 238000012545 processing Methods 0.000 claims description 18
- 238000009833 condensation Methods 0.000 claims description 16
- 230000005494 condensation Effects 0.000 claims description 16
- 238000010790 dilution Methods 0.000 claims description 14
- 239000012895 dilution Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 230000029087 digestion Effects 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 abstract description 22
- 238000004064 recycling Methods 0.000 abstract 2
- 239000002657 fibrous material Substances 0.000 description 46
- 239000002023 wood Substances 0.000 description 18
- 239000000463 material Substances 0.000 description 16
- 238000004659 sterilization and disinfection Methods 0.000 description 10
- 239000000126 substance Substances 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 5
- 239000007795 chemical reaction product Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 229920001131 Pulp (paper) Polymers 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000011093 chipboard Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000001954 sterilising effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000010327 methods by industry Methods 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 1
- 101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000002761 deinking Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000249 desinfective effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
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- 238000005194 fractionation Methods 0.000 description 1
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- 238000000227 grinding Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
Definitions
- the present invention relates generally to an apparatus and method for reducing steam loss in a closed system.
- the device and the method of the present invention are used in particular in the field of the extraction of primary fiber materials (pulping), the processing of secondary fiber materials from waste paper, the material processing in general and the defibration for the production of chipboard.
- pulp primary fiber materials
- secondary fiber materials from waste paper
- defibration for the production of chipboard.
- other process engineering uses are also conceivable.
- FIG. B a system for processing secondary fiber from waste paper is shown schematically in FIG. B. is described in DE-A-197 42 729. Only components for disinfection, fractionation or grinding and thinning of the fibrous material are shown in the system. However, it is obvious to the person skilled in the art that such systems can also contain other further components (for example for bleaching, for so-called "deinking", etc.).
- the system shown in FIG. 1 is a closed system with a material input 1 and a material output 2.
- the solid introduced into the system is a fibrous material which, for example, has a certain consistency of approx. 35% OTRO (oven-dry; DIN EN 20 638) and has a temperature of approx. 40 ° C.
- the fibrous material is introduced into a heating screw 3 via the material entry 1.
- the heating screw is supplied with live steam by means of a device for supplying live steam 4, so that an environment with a pressure of approximately 1.7 bar and a temperature of 105 to 115 ° C. is established in the heating screw.
- the fiber material can be effectively sterilized, which is transported or conveyed in the heating screw and has an appropriate residence time in the screw of, for example, approximately 20 minutes.
- the material is preferably introduced by means of a stuffing screw, so that the stuffing screw closes the printing system on the side of the material input.
- the fibrous material After staying in the Heating screw, during which the fibrous material is continuously conveyed, the fibrous material is discharged from the heating screw and introduced into a disperser 6 via a screw 5. After disinfection, disruptive contents remaining in the fibrous material are dispersed in the disperger 6 and divided into small pieces, so that the end product is not adversely affected by the remaining constituents.
- the fibrous material is then discharged from the disperser 6 and introduced into a discharge container 8 via a screw conveyor 7.
- a device for introducing dilution water 9 is used to introduce dilution water into the discharge container 8 in order to make the highly consistent fibrous material pumpable.
- the pumpable, medium-consistency fibrous material is then discharged from the discharge container 8 via a pump 10 and has a consistency of, for example, approximately 13% OTRO.
- the fibrous material is thus conveyed in the conveying direction in the system from the material input 1 to the material output 2.
- This system is a closed pressure system, which is closed on the one hand by the stuffing screw (not shown) at the material feed and on the other hand by the pumpable fibrous material (essentially a liquid section) by the MC pump at the material discharge.
- dilution water is supplied to the discharge container 8 via the device for supplying dilution water 9 in order to make the fibrous material pumpable, so that in a second section 13 of the discharge container 8 there is essentially a fibrous substance-liquid mixture.
- an intermediate section 14 is formed between the first section 12 and the second section 13, in which a mixing zone is formed from an essentially fiber-vapor-liquid mixture.
- the technical problem on which the present invention is based is therefore to provide a device and a method which makes it possible to reduce the loss of steam in closed systems and thereby to improve the energy balance of the overall system.
- the device of the present invention is characterized in that it has a container which defines an enclosed space and through which solid transport takes place in a conveying direction from an inlet to an outlet.
- the solid can be, for example, fiber, wood pulp, wood chips, etc. However, other solids are also conceivable.
- the container of the device according to the invention is divided in the conveying direction into three sections, of which essentially a solid-steam mixture in a first section, essentially a solid-liquid mixture in a second section and essentially an intermediate section Solid-steam-liquid mixture is present.
- the device of the present invention further comprises at least one location of the container means for introducing a substantially non-condensable gas into the closed space, whereby the condensation of the steam in the container is reduced and therefore the steam loss of a closed system with the device according to the invention is reduced can.
- the device for introducing a substantially non-condensable gas is advantageously arranged in the closed space in such a way that the gas can be introduced into the first section, ie the section with the solid-steam mixture.
- the non-condensable gas forms a kind of isolation barrier zone from the steam, which effectively reduces the steam condensation in the container.
- a kind of displacement body is formed by the gas, which forces the entrained steam back from the condensation surface.
- the device for introducing a substantially non-condensable gas into the closed space is designed such that the gas can be introduced into the closed space under pressure. This is particularly necessary when the device of the present invention is used in a pressure system so that this pressure has to be overcome in order to introduce the gas.
- Air, inert gas, reactive gas or ozone is advantageously used as the non-condensable gas.
- the selection of the gas to be used is subject to various considerations, including taking into account the overall system in which the device according to the invention is used. If, for example, a system for processing secondary pulp from waste paper is used, which also includes a bleaching step, it must be taken into account that some gases, such as oxygen, could react with the bleach. This could affect the corresponding process. However, a gas that is reactive could also be used to cause chemical reactions that are useful and beneficial in the process, such as Carbon dioxide to reduce pulp pH. Another possibility is the use of inert gases such as argon, helium, krypton and other gases such as nitrogen. Another factor in the selection is the cost of the gas to be used, for example the production of ozone is comparatively expensive. However, it is essential that the gas is a so-called non-condensable gas.
- the inlet is arranged in such a way that it is connected to the first section, that is to say the section with the pulp / fiber mixture, and the outlet is arranged in such a way that it is connected to the second section, that is to say the section with the solid-liquid mixture. This ensures that the solids are transported in the conveying direction from the first section via the intermediate section to the second section.
- the inlet could also be arranged in such a way that it is connected to the second section, that is to say the section with the solid-liquid mixture, the outlet being arranged in such a way that it is connected to the first section, that is to say the section with the solid-steam mixture.
- the solids transport would then take place in a reverse direction and thus in the conveying direction from the second section via the intermediate section to the first section.
- the gas of the present invention is advantageously selected such that when the gas is introduced into the container, the condensation of the steam in the closed space, in particular in the intermediate section and the second section, is reduced.
- the gas fed in can be expediently discharged from the outlet with the solid in the conveying direction, so that it does not remain in the device. In this case, the gas has to be tracked continuously.
- the gas can also be output elsewhere.
- the present invention proposes a device for stock preparation, in particular for waste paper processing, which has a closed system with a heating screw and a discharge container, with a solid being transported in the conveying direction from the heating screw to the discharge container.
- the discharge container of this device is a device as described above.
- the device for stock preparation also has a disperser, which is arranged downstream of the heating screw and arranged upstream of the discharge container in order to cause the pulp to be ground or fragmented, so that remaining constituents can be comminuted so that they can be separated into no longer have a negative impact on the end product.
- a screw conveyor is arranged between the heating screw and the discharge container or the disperser and the discharge container.
- This screw conveyor is, for example, a stuffing screw, but can alternatively also be an inexpensive, conventional screw conveyor which has the function of a valve which is only partially open.
- the system is advantageously a printing system.
- the heating screw advantageously has a device for supplying live steam into the heating screw, for example in order to provide the temperatures which are necessary for disinfection.
- a device for supplying dilution water into the discharge container can be provided in order to form the second section and to make highly consistent fibrous material pumpable.
- the present invention also proposes a device for digestion in a closed system with a refiner and a discharge container.
- the solids are transported in the conveying direction from the refiner to the discharge container, which according to the invention is a device as described at the beginning of the summary of the invention.
- the device according to the invention can advantageously have a cyclone and a heat exchanger for digestion, the cyclone being connected downstream of the refiner and is arranged upstream of the discharge container and the heat exchanger is arranged downstream of the cyclone in another conveying branch.
- the cyclone is essentially connected directly to the discharge container.
- the present invention proposes a device for defibration in a closed system.
- fiberization is to be understood as a device in which wood chips (wood chips) are processed so that they For example, can be processed into chipboard.
- This device according to the present invention has a feed screw and a steam room.
- the feed screw is advantageously connected to the steam chamber and there is a transport of solids in the conveying direction from the feed screw to the steam room.
- the feed screw of the device for defibrating the present invention is a device as described at the beginning.
- the feed screw of the fiberizing device advantageously has an inlet for solids mixed with liquid and a device for removing the liquid from the heating screw.
- the feed screw is connected to the steam room and forms the pressure seal for the system at the material feed.
- a solids transport is generated in a conveying direction from an inlet to an outlet of a container, which defines an enclosed space and is divided into three sections in the conveying direction.
- the three sections correspond to the three sections of the container described at the beginning.
- an essentially non-condensable gas is introduced into the closed space at at least one point of the container.
- the developments of the method according to the invention essentially correspond to the developments of the device according to the invention, which was described at the beginning.
- the method according to the invention for example in a method, can be used for stock preparation, in particular for processing waste paper, for digestion or for defibration.
- Figure 1 is a schematic representation of a system for processing secondary fiber from waste paper according to the prior art
- Figure 2 is a schematic view of the device according to the invention.
- Figure 3 is a schematic view of a system for processing secondary pulp from waste paper according to the present invention.
- FIG. 4 shows a schematic view of a discharge container of the system for processing secondary fiber from waste paper from FIG. 3;
- FIG. 5 shows a schematic view of a digestion system according to the present invention
- FIG. 6 is a schematic view of a fiberization system in accordance with the present invention. 5. Detailed description of the invention
- FIG. 1 A device of the present invention is shown purely schematically in FIG.
- the device has a container 20 which defines an enclosed space.
- an "inlet” 21a and 21b and an “outlet” 22a and 22b are provided.
- solids are introduced via inlet 21a, whereas solids are discharged via outlet 22a.
- This variant is shown by the solid arrows 23 and 24.
- the substance can also be introduced through the inlet 21b and the substance can be discharged via the outlet 22b. This variant is shown by the dashed arrows 25 and 26.
- the closed space defined by the container 20 is divided into three sections 12 to 14, of which a solid-steam mixture is present in a first section 12 and a solid-liquid mixture is present in a second section 13.
- a solid-steam mixture is present in a first section 12
- a solid-liquid mixture is present in a second section 13.
- an intermediate section 14 arranged between them, there is a kind of mixing zone from the two sections 12, 13, so that a solid-steam-liquid mixture is formed.
- These mixed states can also contain other components in small amounts, such as chemical residues or other contaminants. It will also be apparent to those skilled in the art that the boundaries between the sections are fluid and rather correspond to further areas and zones.
- the solids transport takes place on the one hand through the inlet 21a in the direction 23 in the order of the first section 12, the intermediate section 14 and the second section 13 from the outlet 22a in the direction 24.
- the solids transport follows exactly in the reverse direction, namely through the inlet 21b in the direction 25 in the order of the second section 13, via the intermediate section 14 and the first section 12 from the outlet 22b in the direction 26.
- the device has a device for introducing a non-condensable gas 27 which, in the embodiment shown, which corresponds to the first embodiment variant with the inlet 21a and the outlet 22a, is connected to the first section 12.
- a device for introducing a liquid medium 28 is also provided, which is connected to the section 13 and can serve to form the sections.
- this device 28 is not absolutely necessary.
- a substance can also be introduced in a solid-liquid mixture and steam can flow in through the outlet in order to form the sections.
- a device for discharging liquid would have to be provided.
- the arrangement shown applies only to a solids transport in the direction of the arrows 23, 24. If the solids transport takes place in the opposite direction according to the arrows 25, 26, the device for introducing the non-condensable gas according to this exemplary embodiment would be with the section 12 arranged in connection.
- a type of "insulation barrier layer” is built up, which vapor condensation of steam, which is carried along with the solid when the solid is introduced, ie introduced into the container, on the surface of the liquid medium both in the intermediate section 14 , as well as the second section 13 is reduced.
- This can effectively prevent the steam condensation from causing a sudden pressure drop in the container 20, which would cause undesired steam flow into the device of the present invention could result.
- steam loss through the condensation can be prevented effectively. Consequently, the steam loss in a closed system can be effectively reduced with this device.
- FIG. 3 the present invention is described purely by way of example using a system for processing secondary fiber material from waste paper and the advantages and mode of operation are explained in more detail.
- the system shown in FIG. 3 essentially corresponds to the schematic system that was explained with reference to FIG. 1 in the introduction to the description.
- the system shown is a closed system, in which a solid input in the form of a fiber with a certain consistency, such as 35% OTRO, is introduced.
- This fibrous material is conveyed through several devices until it is finally introduced into a discharge container 8.
- Dilution water is fed to this discharge container 8 via a device 28 in order to make the fibrous material pumpable, so that a solids discharge or fibrous substance discharge, for example a medium-consistent fibrous substance with approx. 13% OTRO, can take place via a pump 10.
- the device for feeding in the dilution water 28 preferably comprises four feed lines for the dilution water, which are positioned tangentially on the application container 8, which has a substantially circular cross section.
- the feed lines are distributed over the edge or the circumference of the container and are each offset by an angle of approximately 90 °. Furthermore, they are positioned in a step-like shape in the axial direction of the container. In other words, the feed lines are connected to the container at different heights, which differ approximately in a range from 100 mm to 500 mm, in particular by 300 mm.
- the system shown also has a heating screw 3, which is supplied with live steam to sterilize the fiber (secondary fiber from waste paper).
- the live steam used for the feed has, for example, a temperature of approximately 135 ° C. and a pressure of 3.5 bar. As a result, temperatures between 105 ° C. and 115 ° C.
- the residence time of the fibrous material during sterilization is between approximately 10 to 30 minutes, in particular approximately 20 minutes, which is considered sufficient.
- the fibrous material is continuously conveyed in the heating screw 3 until it is discharged from the heating screw 3.
- the heating screw 3 is connected via a screw 5 to a disperser 6, which serves to comminute and distribute remaining constituents in the fibrous material such as, for example, ink particles adhering to the fibers or distributed between the fibers, so that they have no negative effects on the end product .
- the disperger 6 is connected to the discharge container 8 via a screw conveyor 7, which according to a preferred embodiment has the function of a partially open valve.
- a steam return line 11 is connected on the one hand downstream of the disperger and on the other hand connected to the heating screw 3, so that a Steam can be returned from a position downstream of the disperser to the heating screw.
- a fiber / steam mixture essentially forms in a first section 12, this first section 12 being arranged in the uppermost region of the discharge container 8 at which the solids are introduced into the discharge container 8.
- Another area is the area 13, in which essentially a fiber-liquid mixture is formed, which can be discharged from the discharge container 8 in the direction 2 by means of a medium consistency pump 10.
- a mixing zone is formed between the two sections 12 and 13, in which both fiber material and steam and liquid are present.
- the solid according to the invention is a fibrous material.
- FIG. 4 shows the discharge container 8 of the system from FIG. 3 in an enlarged view and the three sections have been visualized schematically.
- the Introducing dilution water into the discharge container 8 forms the three sections mentioned above.
- the device for supplying dilution water can be formed above or below the boundary between the intermediate section 14 and the section 13 of the solid-liquid mixture.
- the surface of the section with the solid-liquid mixture and the surface of the liquid portions in the intermediate section 14 form in the discharge container 8 a "colder" condensation surface in comparison to the temperature of the supplied pulp and the steam.
- the vapor introduced into the discharge container 8 with the fibrous material would therefore tend to condense on this surface, so that a sudden pressure drop would occur in the discharge container 8 during the condensation.
- This pressure drop would lead to an increased steam flow from the heating screw 3 into the discharge container 8, so that the steam would escape from the heating screw 3, which in turn would have the consequence that new live steam 4 is introduced into the heating screw via the device for supplying live steam would.
- the generation of live steam requires a large amount of energy, so that this effect would be disadvantageous and should be avoided.
- the discharge container 8 is assigned a device for introducing a non-condensable gas for this purpose, which is connected to the section 12 in the exemplary embodiment. Since the present system is a pressure system, the gas, for example air, is pressed against the pressure in the system. The non-condensable gas tends to flow to a cold surface. In the present case, the section 13 and the liquid components in the intermediate section 14 form the cold surface to which the non-condensable gas flows. This forms in the Discharge container 8 a kind of insulation barrier layer, which reduces the condensation of the steam in the discharge container 8 on the previously described condensation surface.
- the pressure drop in the discharge container 8 can be reduced or even excluded, so that the increased (compared to the prior art) steam flow from the heating screw 3 into the discharge container 8 is avoided.
- the live steam introduced into the heating screw 3 can be used more effectively for disinfection and less live steam has to be supplied via the device 4. Therefore, the energy requirement of the system according to the invention is significantly lower compared to a comparable system of the prior art. As a result, a significant amount of energy costs are saved.
- the solids input 1 was made with a fibrous material which had a consistency of approx. 35% OTRO and was 12 tons per hour (t / h) in the comparative tests.
- the temperature of the dispensed fiber was about 80 ° C, whereas the temperature of the dispensed fiber in a plant according to the present invention was between about 66 ° C and about 70 ° C.
- FIG. 5 shows another exemplary embodiment of a device for digestion according to the present invention.
- the system shown schematically represents a TMP or CTMP method for digestion.
- the digestion system shown in FIG. 5 represents a closed system. In the system there is a material input 1 in the form of wood chips into an entry screw 34. In this screw 34, the wood chips are heated to 160 ° C., for example.
- the present system is also a pressure system that operates at between about 5 to about 8 bar.
- the wood chips (solid) are introduced into a refiner 6.
- This refiner is driven by a motor M and generally requires a large amount of energy.
- the wood chips are crushed in the refiner 6 and cut into small pieces.
- the wood chips are broken down as completely as possible into individual fibers by the refiner work introduced in accordance with the process objective. Since this is a technical process that has an impact on efficiency, this is only possible to a certain extent.
- a part of the wood chips remains as a chip material (chips are fiber bundles), which is then treated in a subsequent process step with a similar workflow with the same basic objective (multi-stage).
- the fibrous material with the steam is then conveyed further into a cyclone 29 in which the steam is to be separated from the fibrous material.
- the cyclone 29 is connected on the one hand to a further delivery line in its upper region, which is to discharge the steam via a heat exchanger 30, so that its heat can be reused or used in another process of the system.
- the cyclone 29 is connected to a discharge container 8.
- connection between the cyclone 29 and the discharge container 8 is preferably made via a stuffing screw, another conventional screw conveyor or similar systems.
- the discharge container in the prior art is always designed to be open, so that steam which is fed into the container via the screw with the fiber material escapes and is lost.
- the cyclone 29 is connected directly to the discharge container 8.
- the discharge container 8 is, however, designed to be closed.
- the connection between the cyclone and the order container could take place in a manner similar to that described in FIG. 3 via a screw conveyor, which has the mode of operation of a partially open valve. Alternatively, this could also be achieved by designing the opening between the cyclone and the discharge container.
- a device for introducing a non-condensable gas into the discharge container 8 is provided.
- a type of insulation barrier layer is generated which reduces the steam condensation in the discharge container 8, so that the pressure in the discharge container 8 can be kept essentially constant. This prevents an increased flow of steam in the direction of the discharge container 8 and the steam in the system can be used effectively via the heat exchanger 30. This significantly improves the overall energy balance of the closed system and reduces the loss of steam due to condensation.
- FIG. 6 shows a device for defibering
- the end product after the defibering can be used for processing chipboard or pressed wood panels (MDF), for example.
- MDF pressed wood panels
- Such devices have an entry screw 31 and a steam room 32.
- This system is also a closed system, in which the wood chips (wood chips, chips) in the steam room are defibrated at a pressure of approx. 10 to approx. 15 bar and a temperature of approx. 170 ° C before they are removed the steam room. Subsequently, these wood chips are ground in a refiner, for example, and blown out directly from them in order to be further processed.
- fresh steam is supplied to the steam room, specifically via a device 4.
- a stuffing screw has been provided in the prior art, which is a considerable one Size and has an enormous energy requirement in the order of 1000 KW.
- the device according to the present invention has a conventional feed screw, which is smaller than a stuffing screw and has a much lower energy requirement of the order of 200 KW.
- the wood chips are introduced via the material input 1 with a high liquid content, so that a section 13 is formed with a solid (wood chip) / liquid mixture which is similar to the system 3 forms the conclusion.
- the wood chips are subsequently conveyed from the feed screw 31 into the steam room 32.
- the feed screw 31 of the exemplary embodiment in FIG. 6 furthermore has a device 33 for removing the liquid introduced with the wood chips from the feed screw. Steam flows in from the steam room through the outlet of the feed screw. Thus, three sections 12 to 14 also form in the feed screw 31.
- a section 13 there will be essentially a solid-liquid mixture, whereas in a section 12 there will essentially be a solid-vapor mixture.
- a mixing zone is also formed in an intermediate section 14, in which there is essentially a solid-vapor-liquid mixture. Consequently, even in such a system there would be the problem that the live steam introduced into the vapor space 32 would condense on the liquid surface in the feed screw 31. This would lead to a pressure drop in the feed screw 31, so that an increased steam flow from the steam space 32 into the feed screw would take place. However, this would result in increased steam loss and therefore increased Lead energy amount because more live steam 4 would have to be supplied.
- the present device has a device for feeding a non-condensable gas into the feed screw 31.
- the non-condensable gas is preferably fed in in section 12 or section 14.
- the non-condensable gas forms a type of insulation barrier layer in the feed screw 31, which prevents the condensation of the vapor on the liquid surface in the feed screw 31 (in the sections 12, 14) is reduced so that the pressure in the feed screw 31 remains essentially constant. Consequently, an increased steam flow from the steam chamber 32 into the feed screw 31 is also reduced. As a result, the total amount of energy required to generate the live steam is reduced, which leads to an improved energy balance of the overall system.
- the connection between the feed screw 31 and the steam chamber 32 is designed, for example, in the form of a partially open valve in order to prevent the gas fed in from escaping into the steam chamber.
- the device according to the invention is advantageous over the prior art because the system can be terminated via a conventional feed screw in the broadest sense and does not have to be via a stuffing screw. Since the energy requirement of a conventional feed screw is significantly lower than that of a stuffing screw, this also reduces the energy requirement of the overall system. In addition, both the size and the cost of the overall system are reduced by the device according to the invention.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05700813A EP1727935B1 (de) | 2004-03-03 | 2005-01-11 | Vorrichtung und verfahren zur reduzierung eines dampfverlustes in einem geschlossenen system |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04004959A EP1571255A1 (de) | 2004-03-03 | 2004-03-03 | Vorrichtung und Verfahren zur Reduzierung eines Dampfverlustes in einem geschlossenen System |
EP05700813A EP1727935B1 (de) | 2004-03-03 | 2005-01-11 | Vorrichtung und verfahren zur reduzierung eines dampfverlustes in einem geschlossenen system |
PCT/EP2005/000180 WO2005085519A1 (de) | 2004-03-03 | 2005-01-11 | Vorrichtung und verfahren zur reduzierung eines dampfverlustes in einem geschlossenen system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1727935A1 true EP1727935A1 (de) | 2006-12-06 |
EP1727935B1 EP1727935B1 (de) | 2008-01-02 |
Family
ID=34745991
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04004959A Withdrawn EP1571255A1 (de) | 2004-03-03 | 2004-03-03 | Vorrichtung und Verfahren zur Reduzierung eines Dampfverlustes in einem geschlossenen System |
EP05700813A Active EP1727935B1 (de) | 2004-03-03 | 2005-01-11 | Vorrichtung und verfahren zur reduzierung eines dampfverlustes in einem geschlossenen system |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04004959A Withdrawn EP1571255A1 (de) | 2004-03-03 | 2004-03-03 | Vorrichtung und Verfahren zur Reduzierung eines Dampfverlustes in einem geschlossenen System |
Country Status (5)
Country | Link |
---|---|
EP (2) | EP1571255A1 (de) |
AT (1) | ATE382733T1 (de) |
DE (1) | DE502005002412D1 (de) |
ES (1) | ES2298992T3 (de) |
WO (1) | WO2005085519A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2876777B2 (de) † | 2013-09-04 | 2023-05-31 | K/S Himpp | Tragbare vorrichtung, ladesystem, stromversorgungsplatine etc. |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115341400A (zh) * | 2022-08-02 | 2022-11-15 | 安徽永利纸业有限公司 | 一种纱管纸生产用原料粉碎装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE359332B (de) * | 1971-12-20 | 1973-08-27 | Reinhall Rolf | |
SE455314B (sv) * | 1985-09-03 | 1988-07-04 | Punya B Chaudhuri | Framstellning av cellulosamassa innefattande kemisk forbehandling och defibrering genom expansion |
-
2004
- 2004-03-03 EP EP04004959A patent/EP1571255A1/de not_active Withdrawn
-
2005
- 2005-01-11 EP EP05700813A patent/EP1727935B1/de active Active
- 2005-01-11 DE DE502005002412T patent/DE502005002412D1/de active Active
- 2005-01-11 ES ES05700813T patent/ES2298992T3/es active Active
- 2005-01-11 WO PCT/EP2005/000180 patent/WO2005085519A1/de active IP Right Grant
- 2005-01-11 AT AT05700813T patent/ATE382733T1/de active
Non-Patent Citations (1)
Title |
---|
See references of WO2005085519A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2876777B2 (de) † | 2013-09-04 | 2023-05-31 | K/S Himpp | Tragbare vorrichtung, ladesystem, stromversorgungsplatine etc. |
Also Published As
Publication number | Publication date |
---|---|
DE502005002412D1 (de) | 2008-02-14 |
ATE382733T1 (de) | 2008-01-15 |
ES2298992T3 (es) | 2008-05-16 |
WO2005085519A1 (de) | 2005-09-15 |
EP1571255A1 (de) | 2005-09-07 |
EP1727935B1 (de) | 2008-01-02 |
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