WO2013029833A2

WO2013029833A2 - Method for receiving and processing dust in a fiber web production environment and dust extraction system

Info

Publication number: WO2013029833A2
Application number: PCT/EP2012/062681
Authority: WO
Inventors: Marco Popp; Torben Schlieckau
Original assignee: Voith Patent Gmbh
Priority date: 2011-08-31
Filing date: 2012-06-29
Publication date: 2013-03-07
Also published as: WO2013029833A3; DE102011081853A1

Abstract

The invention relates to a method for receiving and treating dust in a fiber web production environment (2), comprising the method steps of: providing a dust extraction system (1) having an extraction unit (5) comprising at least one inlet (4); suctioning dust and or dust-containing gases (SL) and guiding and treating same in the dust extraction system (1). The invention is characterized in that the dust and/or the dust-containing gas (SL) are moistened in the surrounding area (7) of the inlet (4) into the extraction unit (5) and/or within the extraction unit (5) by steam (D). The invention further relates to a dust extraction system.

Description

Method for picking up and processing dust in one

Fibrous web production environment and dedusting system

The invention relates to a method for picking up and treating dust in a fibrous web manufacturing environment, more particularly with the features of the preamble of claim 1. The invention further relates to a dedusting system.

During tissue production, especially in the removal area of the fibrous web from the drying cylinder, fibers and dust are released. These are entrained and transported with the air boundary layers forming on both sides of the fibrous web. The moving air boundary layer is able to carry a lot of dust. The thus released released dust and fibers tend to accumulate on functional elements and units of the machine, resulting in deterioration of the operation of the functional elements and units depending on the degree of deposition / accumulation. The entrained dust also results for the operating personnel in unfavorable environmental conditions. For this reason, a dedusting system is assigned to the surrounding regions of the fibrous web that are particularly prone to contamination. Such systems are previously known in different embodiments from the prior art.

The dedusting system comprises at least one suction device extending over at least a portion of the fibrous web manufacturing environment and having at least one inlet. About the at least one inlet is a suction of dust and / or dust-containing gases, in particular dust-laden air. The sucked dust and / or the sucked dust-containing air are guided in the dedusting system and processed or separated in a treatment and treatment facility. Next However, high suction power required may locally lead to unwanted deposits of the extracted dry dust in the suction itself and the connecting lines between this and the treatment and processing device. These deposits are prone to electrostatic charge and are very quickly ignited by a discharge spark. Partly also dust explosions are to be observed. Therefore, find in the previously known systems flame detectors for the early detection of such a condition and means for deleting fires in the connecting lines application. Furthermore, fire dampers are required in the piping between a single suction device and treatment and processing device.

Dust removal systems which are based on contact of the dust with water are known, for example, from DE 698 06 039 T2, EP 1 169 1 10 B1 and EP 2 060 676 A1.

DE 698 06 039 T2 discloses a device for dedusting with means for forming a curtain of water for lifting and entraining the particles in the air. This design is complex and characterized by large amounts of water required.

EP 1 169 1 10 B1 and EP 2 060 676 A1 disclose embodiments of a dedusting system in which a fluid, in particular water for washing out the dust, is introduced into the suction device. The fluid is guided with the dust in the dedusting system. However, such systems are characterized by a strong tendency to deposit and cause a high maintenance.

The invention has for its object to further develop a method for dedusting fibrous web manufacturing environments and a dedusting system such that the risk of fire and explosion in the exhaust system is minimized and is safer for the operator and the operator. Further the maintenance is to be reduced compared to the known systems.

The solution according to the invention is characterized by the features of claims 1 and 13. Advantageous developments are each in the

Subclaims reproduced.

A method of receiving and treating dust in a fibrous web manufacturing environment, comprising the steps of:

Providing a dedusting system having at least one suction device extending over at least a portion of the fibrous web manufacturing environment and having at least one inlet;

Sucking dust and / or dust-containing gases, in particular dust-laden air into the at least one inlet of the suction device;

Guidance and treatment of the dust and / or dusty gases in the dedusting system;

is characterized according to a first approach, characterized in that the dust and / or the dust-containing gas are moistened in the surrounding area of the inlet to the suction device and / or within the suction device with steam.

Alternatively or additionally, according to a second approach,

the dust and / or dust-containing gas in the surrounding area of the inlet to the suction device are moistened with an atomized fluid.

The term fibrous web manufacturing environment describes the environment of a machine for fibrous web production, in particular the fibrous web when guided by the machine for producing this surrounding area.

Under dust or dust, particles in the form of small solids

or particles understood which in the case of fluidization in gaseous Media are able to hover in these at least temporarily. These can consist of inorganic or organic substances.

The humidification of the dust and / or dusty gas with steam and / or an atomized fluid has the advantage that on the one hand, the dust is very easily bound and the electrostatic charge and the associated tendency to ignite is significantly reduced or avoided. The risk of fire, especially in the pipe system can be minimized thereby, resulting in complex facilities for monitoring the

Dedusting system and fire fighting equipment within the system such as extinguishing equipment and fire dampers can be dispensed with. On the other hand, only temporary exposure of the dusts and / or dust-containing gases to the vapor and / or atomized fluid only moistening, in which a relative humidity of the dusts and / or dust-containing gases, in particular air in the range between 40% and 65%, preferably 55% and 65% is set. This moisture content makes it possible to guide them through the dedusting system while avoiding sooting in the extraction and piping system, since the walls delimiting the flow path are only exposed to moistened media and not directly to a fluid.

Preferably, the dust and / or the dust-containing gas is humidified with steam having the following parameters:

Steam at a pressure p (ü) in the range of 0.1 bar to 16 bar, preferably 0.1 bar to 3 bar, wherein p (ü) = overpressure and overheating in the range of 5 ° C to 100 ° C, preferably 5 ° C to 20 ° C or saturated steam with a pressure p (ü).

The steam used for humidification can have a separate

Steam delivery system can be provided. According to an advantageous development, in cases where the

Faserstoffbahnherstellung environment at least a portion of a machine for producing a fibrous web and the machine at least one steam-heated cylinder and associated therewith a steam / Condensate system comprises, for reasons of functional concentration with optimum utilization of anyway required functional elements and units of steam used for humidification from the steam / condensate system of the at least one steam-heated cylinder of the machine.

In a further particularly advantageous embodiment, in order to improve the energy balance and reduce the external energy consumption additionally or alternatively in embodiments of the fibrous web production machine with at least one hot air operable drying device with at least one exhaust duct, the steam used for humidification using the

Waste heat from the exhaust air can be generated from the dryer operated with hot air.

The humidification with an atomized fluid is preferably carried out with water, which is injected at a pressure of between 50 bar and 100 bar. The water is preferably decalcified.

The following explanations apply to both solutions and can be used individually or in combination with each other.

The moistening of dust and / or dusty gas in one

Surrounding area of an inlet into the suction device takes place in a region which is surrounded by a radius in the range of 15 ° to 180 ° about a

Extension of the inlet over the

Fibrous web manufacturing environment describing the theoretical axis. The humidification within this environmental area ensures entry into the suction with a predefined moisture content, which meets both the requirements of fire protection and the reduction / prevention of rotting tendency of fluid-carrying walls in dedusting. Re-drying until entry into the suction device is almost avoided due to the small distance. Depending on the requirements of the application, the extraction takes place within a fibrous web manufacturing environment, which by a

Surrounding area of a movable along a Bahnführungsweges

Fibrous web is characterized, based on the fibrous web either only on one side, but preferably to ensure adequate dedusting always on both sides.

The dust and / or the dust-containing gas according to a first variant with respect to at least one of the following sizes

- One, the amount at least indirectly characterizing size

- One, the properties at least indirectly characterizing size

a variable having at least indirectly characterizing process parameters with steam and / or atomized fluid, constant over at least a portion of the extent of the fibrous web manufacturing environment transverse to

Guiding direction of the fibrous web and / or applied in the guide direction. With completely uniform loading over the extent of the respective area of the fibrous web production environment, the constructional and control-related expenditure for the provision of the moistening medium and its discharge can be kept low.

According to a second variant of the dust and / or the dust-containing gas with respect to at least one of the following sizes

- One, the amount at least indirectly characterizing size

- One, the properties at least indirectly characterizing size

- One, the process parameters at least indirectly characterizing variable with steam and / or atomized fluid variable, in particular variably adjustable over at least a portion of the extension of the

Fibrous web production environment transverse to the direction of the

Fiber web and / or applied in the guide direction. This embodiment makes it possible to adjust the relative humidity of the dust and / or dusty gas in said directions, which may be constant or characterized by a profile. This version thus allows an optimal Adjusting the moistening power to be applied to different dust concentrations in the pulp web production environment.

In a particularly advantageous further development of the second variant, the moistening of the dust and / or the dust-containing gas is controlled, preferably regulated, over the extent of the fibrous web production environment transversely to and / or in the guide direction of the web. The control takes place in an advantageous embodiment as a function of a variable which at least indirectly characterizes the concentration of dust in the fibrous web production environment.

In terms of apparatus, the dedusting system, in particular dust collection and treatment system for fibrous web environments with at least one over at least a portion of the extension of the

Fibrous web production environment extending and at least one

Inlet-connected suction device, which is connected to at least one treatment and processing device for dust and / or dust-containing gas carried out. In the surrounding area of the inlet into the suction device and / or within the suction device, at least one moistening device which delivers steam and / or atomized fluid is arranged. The advantages apply, as already mentioned for the methods according to the invention.

The at least one moistening device is in this case arranged and designed to be suitable, steam with the following parameters:

Superheated steam at a pressure p (ü) in the range of 0,1 bar to 16 bar, preferably 0,1 bar to 3 bar, where p (ü) = overpressure and overheating in the range of 5 ° C to 100 ° C, preferably 5 ° C to 20 ° C or saturated steam.

The humidification with an atomized fluid is preferably carried out with water, which is injected at a pressure of between 50 bar and 100 bar. The water is preferably decalcified. These parameters ensure a predefined relative humidity of the

Moistened dust and / or dusty air in the suction device and the dedusting system. The single humidifier is located in the vicinity of the inlet of the suction device, which is characterized by a radius in the range from ... to a theoretical axis describing the extent of the inlet in the fibrous web manufacturing environment. This small distance serves to maintain the moisture and prevents re-drying until it enters the suction device.

With regard to the arrangement and design of the individual suction device there are a variety of possibilities. At least one is

Extraction device provided which at least over a partial area, preferably over the entire extent of the

Fibrous web production environment, in particular transversely to the guide direction of the fibrous web is arranged extending.

In a particularly advantageous manner, a plurality of suction devices is provided, wherein the individual suction devices are arranged within the fibrous web production environment in the guide direction of the fibrous web in series one behind the other and / or transverse to the guide direction of the fibrous web in series next to each other. This arrangement allows for a long-range dedusting and also the use of small standardized suction devices, which are summarized to form an overall unit.

In order to avoid malfunctions due to accumulating dust accumulating on functional elements and units in the fibrous web production environment, suction devices are preferably arranged on both sides of the fibrous web. The single aspirator preferably has an inlet extending substantially throughout its extent in the fibrous web manufacturing environment. However, it is also conceivable a plurality of inlets, which are arranged juxtaposed over the extension of the suction device.

The individual moistening device can extend at least over a partial region, preferably over the entire extent of a single suction device, within this or the inlet upstream. The former offers the advantage of using standardized smaller humidifiers. In an advantageous development, a plurality of moistening devices can be provided, which are arranged in series one behind the other in the guide direction of the fibrous web and / or transversely to the guide direction of the fibrous web over the entire extension of the suction device upstream within this or the inlet.

For setting a defined moisture and / or moisture profile in and across the fibrous web guiding direction, at least a part of the individual suction devices and / or moistening devices can be controlled individually or at least part of the individual suction devices and / or

Humidifying devices in groups or jointly controllable.

The dedusting system according to the invention is in a particularly advantageous manner in fibrous web production machines in the form of tissue machines

used.

The solution according to the invention is explained below with reference to figures. The following is shown in detail:

FIG. 1 shows by way of example a dedusting system according to the invention;

FIG. 2 shows a schematic simplified arrangement of a

Suction device with respect to the fibrous web; FIG. 3 shows a schematic simplified arrangement of a

Humidifier before the inlet into a suction device; FIG. 4 shows a schematic simplified arrangement of a

Humidifying device in a suction device;

Figures 5a to 5f show possible in a schematic simplified representation

Arrangements of the suction in the

Fibrous web production environment with respect to the fibrous web in the guide direction of this;

Figures 6a to 6b show possible in a simplified schematic representation

Arrangements of the suction in the

Fibrous web production environment with respect to the fibrous web transversely to the guide direction of this;

Figures 7a and 7b show possible in a simplified schematic representation

Arrangements of moistening devices based on a suction device;

Figure 8 illustrates in a schematically simplified representation of a

Dedusting system associated with control system;

FIG. 9 shows an advantageous use of a device according to the invention

Dedusting system in a tissue machine.

FIG. 1 shows, in a schematically simplified representation, the basic structure and the basic function of a dedusting system 1 for a

Fibrous web production environment 2, in which dust-containing gas, in particular dust-containing air SL is moistened with steam D. The

Dedusting system 1 is a Staubesammei- and treatment system

executed. It is one, not shown here in detail machine for producing a fibrous web F, in particular a tissue machine in

Bahnführungsweg 3 of the fibrous web F assigned. Shown is only a part of a Bahnführungsweges 3 of such a machine for a fibrous web F. To illustrate the individual directions is a

Coordinate system applied to the web guide path 3 of the fibrous web F. The X direction corresponds to the guiding direction through the machine and will therefore also referred to as machine direction MD. The Y direction corresponds to the direction perpendicular to the Bahnführungsweg 3 in the horizontal direction and thus the cross machine direction. The Z direction corresponds to the height direction. The dedusting system 1 comprises at least one suction device 5, which extends over at least one subregion of the fibrous web production environment 2 and has at least one inlet 4. The arrangement of the suction device 5 preferably takes place in the immediate vicinity of

Fiber web F. The at least one suction device 5 is used to suck in dust and / or dust-containing gas, in particular air SL, into the at least one inlet 4 of the at least one suction device 5. The individual suction device 5 is used to generate the suction required

Vacuum coupled to a vacuum source 6. In the case shown, a suction hood 13 is still provided. In this case, each suction device 5 may be assigned a separate vacuum source 6 or all together one

This may, for example, comprise a drivable fan which is arranged in a line system 8 coupled to the individual suction device (s) 5. According to the invention, the dust-containing gas, in particular the dust-containing air according to a first

Solution with steam D moistened. The humidification can in the

Surrounding area 7 of the inlet 4 of the suction device 5, i. before entering the suction device 5 and / or only within the

Suction device 5, i. take place behind the inlet 4, in which case the dust-containing gas sucked in via the inlet 4 is moistened. According to a second approach, the dust-containing gas, in particular the dust-containing air in the surrounding area 7 of the inlet 4 is moistened with a fluid, preferably water. The moistening is carried out by spraying, in which the fluid, atomised, comes into contact with the dust-containing air as an aerosol. For this purpose, the suction device 5 is associated with at least one moistening device 10 such that, as a function of the moistening location, moistening takes place upstream of the inlet 4 and / or takes place within the suction device 5.

Schematically simplified illustrated in Figure 1 is an example of an embodiment according to the first approach with arrangement of the humidifier 10 within a single suction device 5. Not shown off

For reasons of clarity, the coupled with this device for providing the humidifying medium, in particular steam source.

The suction device 5 is preferably designed in the form of a collector, in which the dust and / or dust-containing gas are absorbed. The suction device 5 is connected via a pipe system 8 coupled thereto, comprising at least one pipe to at least one treatment or conditioning device 9, for example in the form of a separator. In this, the separation of dusts from this leading and the line system 8 passing dusty gas SL takes place. The separated dust S can be removed as waste product from the separator. The dust-cleaned gas or the air L is output via at least one exhaust gas outlet 12. Preferably, via the at least one treatment or treatment device 9, the exhaust gases AP from a, the machine for producing the fibrous web F, in particular tissue machine associated pulper 1 1 processed. In particular, in tissue production when the fibrous web F is removed from a drying cylinder by means of a creping knife over the entire width of the fibrous web F dust and fibers are released, which are deposited between creping knife and drying cylinder and / or entrained in both sides of the fibrous web moving air layers and stirred up, it is for reasons of fire safety and the avoidance of unfavorable environmental conditions for the operator required to remove this dust and / or the dusty gases, especially air SL also over the entire width of the fibrous web F and due to the steady attack continuously. Therefore, one or a plurality of suction devices 5 are arranged and designed such that they are suitable for transporting the dust and / or the dust-containing gas, in particular air SL, over the entire width of the fibrous web production environment 2, preferably directly perpendicular to Guide direction of the fibrous web F and thus the web guide path 3 or in the width direction of the fibrous web F to suck. The arrangement of the individual suction device 5 in the fibrous web production environment 2 takes place without contact with respect to the fibrous web, as shown in Figure 2 in detail using the example of an arrangement of a suction device 5 relative to the fibrous web F based on the illustrated by means of arrow and the Bahnführungsweg 3 descriptive guide direction of the fibrous web F. , The suction device 5 is here associated with the bottom Fu of the fibrous web F. The dust-containing air SL in the peripheral region forming the fibrous web manufacturing environment region 2 is drawn in via the at least one inlet 4 of the suction device 5. The suction device 5 is arranged without contact to the fibrous web F. The inlet 4 is arranged at a distance a to the bottom Fu of the fibrous web F. The optimum distance a can be selected as a function of the available suction power. This is for example 15 cm to 2500 cm.

The surrounding area 7 of the inlet 4 can be described by a radius r with respect to the extent of the inlet 4 transversely to the guide direction of the fibrous web F and thus the Bahnführungsweg 3. The arrangement of the at least one humidifying device 10 can be arranged upstream of it in the surrounding area 7 of the inlet 4 or in the interior 17 of the suction device 5 and thus downstream of the inlet 4 in terms of flow.

The suction is due to the position of the inlet 4 with respect to the

Fibrous web F definable. This can be parallel or at an angle to this.

FIGS. 3 and 4 show, by way of example, possible basic arrangements of the at least one humidifying device 10 on the basis of a highly simplified perspective view of a suction device 5. In the embodiment in FIG. 3, the humidifying device 10 is arranged in the surrounding region 7 of the inlet 4. The arrangement takes place at a distance from the inlet 4 Moistening device 10 preferably comprises a plurality of nozzles 24 directed against the inlet 4. These can be arranged in a row transversely to the guide direction of the fibrous web next to one another and / or with an offset in the guide direction relative to one another. Conceivable is alternatively or additionally also an arrangement in rows based on the guide direction of the fibrous web. The arrangement of the moistening device 10 takes place in such a way that it is suitable for moistening the air to be sucked in via the inlet 4 before it enters the inlet 4. Shown is a humidifying device 10, which extends over the entire extent of the inlet 4 of the suction device 5. Also conceivable is an embodiment with a plurality of such moistening devices 10, which by arrangement next to one another extend over the extent of the inlet 4.

The individual humidification device 10 is at least indirectly coupled to a humidification medium supply unit 14, for execution in the form of a steam source according to the first approach, according to the second approach of a fluid source and / or gas source. The coupling takes place in the illustrated case, for example via at least one connecting line 15. In the coupling means 16 for controlling / regulating the

Befeuchtungsmediums, in particular steam D or the fluid to be atomized FL be provided.

In contrast, FIG. 4 illustrates a possible arrangement of a

Humidifying device 10 within the suction device 5, in particular an interior 17 of this. In this case, the moistening device 10 can be designed and arranged in such a way that it absorbs the sucked-in dust

or the sucked dust-laden air to the inlet 4 downstream of steam D acted upon. Preferably, the moistening device 10 has a multiplicity of nozzles, wherein at least one part is arranged and aligned in such a way that the exiting steam jet is directed directly against the dust-containing gas sucked into the inlet 4, in particular the dust-containing air. Also in this embodiment, only one or a plurality of such moistening devices 10 can be provided, which are arranged in series next to each other over the extension of the suction device 5 extending and / or one behind the other.

In both embodiments, the individual moistening device 10 can be coupled to a moistening medium supply unit 14, in FIG. 3 a vapor source or source of a fluid and / or gas, in FIG. 4, to a vapor source. The coupling takes place via corresponding connecting lines 15, wherein the optional coupling / decoupling and / or control / regulation of

exiting humidifying medium via appropriate means 16 takes place. These are, for example, adjusting devices of a

Supply system, in particular steam supply system and / or

Adjustment devices in the connecting line 15 between the

Provision unit 14 and the humidifier 10 and / or

Adjustment of the individual humidifier 10 itself.

With regard to the arrangement of the at least one suction device 5 there are a plurality of possibilities. These are shown in a schematic simplified representation in Figures 5a to 5f.

The arrangement of a single suction device 5 is according to Figure 5a in the fibrous web production environment 2 only one side of the fibrous web F assigned, for example, only on the fibrous web top F ₀ free of contact with this. The arrangement of the suction device 5 according to Figure 5b is assigned only on one side of the fibrous web F, for example, only on the fibrous web bottom Fu free of contact with this.

FIG. 5 c illustrates an advantageous arrangement of suction devices 5 on both sides of the fibrous web F. The arrangement takes place here on both sides of the fibrous web F directly opposite one another, ie on a common perpendicular to the web guiding path 3 of the fibrous web F. In contrast 5d shows an arrangement of suction devices 5 on both sides of the fibrous web F with offset from each other in the guide direction of the fibrous web F, ie in the direction of Bahnführungsweges 3. Figure 5e shows a particularly advantageous arrangement of suction 5 on both sides of the fibrous web F connected in series, as also in Figure 1 shown. The arrangement takes place here in the direction of

Bahnführungsweges 3 on each fibrous web side in series successively and on both sides of the fibrous web F directly opposite each other.

By way of example, two rows are shown, but arrangements with several rows are also conceivable. The optimum distance between them is determined by the degree of soiling of the fibrous web production environment and the suction power of the individual suction device 5. Figure 5f illustrates an embodiment according to Figure 5e with both sides of the

Fibrous web F in the fibrous web production environment 2 in series suction devices 5, wherein the arrangement in the guide direction of the fibrous web F, in particular in the direction of the web guide path 3 viewed with respect to each other.

Combinations of the embodiments shown in Figures 5a to 5f are also conceivable.

The suction is preferably carried out over the entire extent of

Fibrous web production environment 2 transverse to the guide direction of

Fibrous web F, in particular of the web guide path 3. For this purpose, a single suction device 5 completely over the extension of

Fibrous web production environment 2 transverse to the guide direction of

Fibrous web F extending, as shown in Figure 6a, be formed or carried out the extension by juxtaposition of individual suction 5 transversely to the web direction, as shown in Figure 6b. In the The variants shown in FIGS. 6a and 6b can be combined with those in FIGS. 5a to 5f.

In all embodiments shown in the figures, the arrangement of the suction devices 5 is preferably perpendicular to the guide direction of

Fibrous web F. It is also conceivable execution at an angle to

Guide direction.

The individual moistening devices 10 can also be designed to extend over the entire extent of the suction device 5 or extend over only a partial area thereof. FIGS. 7a and 7b illustrate, by way of example, possible assignments of moistening devices 10 to a single suction device 5, wherein the embodiments relate both to the arrangement in the interior 17 and the inlet 4 upstream.

Figure 7a shows an embodiment of a humidifying device 10, which

Suction device 5 over the extent in the

Fibrous web production environment 2 is assigned and also extends over the extension of the suction device 5, in particular the inlet 4 or the inner space 17 and thus the width of the suction device 5 substantially.

Figure 7b shows an embodiment in which the extension over the entire extension of the suction device 5, in particular the width of the

Suction device 5 by juxtaposing a plurality of

Humidifying 10 is realized. The single ones

Humidifying devices are here arranged directly in series over the extension of the suction device 5 free from offset from one another transversely to the width direction. Furthermore, a moistening device 10 may also be assigned to a plurality of suction devices 5, in particular in the case of pre-arrangement with respect to FIGS Admitting 4 more in series juxtaposed suction devices 5, as shown in Figure 6b.

The embodiments shown in Figures 2 to 7 are exemplary and can be combined.

With regard to the detailed design of a single moistening device, reference may be made to prior art embodiments. These may be, for example, individual nozzles or nozzle blocks. The nozzles can be designed as slit nozzles.

In a particularly advantageous manner, the moistening and thus the resulting moisture profile can be controlled and / or regulated. For this purpose, the individual suction devices 5 and / or moistening devices 10 are preferably controllable and / or controllable. The control can be individually, in

Groups or together. 8, there is provided a control system 19 comprising a controller 18 provided with means for acquiring actual values, for example means 20 for detecting at least one of the fiber web production environments at least indirectly, i. directly or through functional relationships or other dependencies characterizing size (for example, a

Device for detecting a variable which at least indirectly characterizes the dust concentration) and / or a device 21 for detecting a variable which at least indirectly characterizes the moisture content of the sucked and humidified gas, in particular air in the dedusting system. In

Depending on at least one of these variables or predetermined actual values, actuating devices are activated. For example, an adjusting device of

Provision unit 14 for the moistening medium and / or a

Adjustment device in the connection between moistening device 10 and delivery unit 14, such as the means 16 and / or an adjusting device of a single or a plurality of moistening devices 10 and / or an adjusting device of a single and / or a plurality of Aspirations 5. The individual manipulated variables are designated here with Y14, Y16, Y10 and Y5.

FIG. 9 illustrates the use and integration of a dedusting system 1 according to the invention in a fibrous web production machine in the form of a tissue machine 25. The drying cylinder 22, from which the fibrous web F is removed, and also a creping knife 23 are shown

Subsequent web guiding area are arranged on both sides of the fibrous web F suction devices 5, which moistening devices 10 are assigned in the manner according to the invention.

LIST OF REFERENCES

1 dedusting system

2 pulp web production environment

3 track guidance path

4 inlet

5 suction device

6 Device for generating a vacuum

7 Ambient area of the inlet

8 line system

9 treatment and treatment facility

10 moistening device

1 1 pulper

12 exhaust outlet

13 exhaust hood

14 deployment unit

15 line

16 funds

17 interior

18 control device

19 control system

20 detection device

21 detection device

22 drying cylinders

23 creping knives

24 nozzle

25 tissue machine

AP exhaust

L air

F fibrous web

FL fluid

SL dusty gas, dusty air manipulated variable

distance

radius

5

Claims

claims

A method of receiving and treating dust in a fibrous web manufacturing environment (2), comprising the steps of: providing a dedusting system (1) having at least one suction device (5) extending over at least a portion of the fibrous web manufacturing environment (2) and having at least one inlet (4) );

Sucking dust and / or dust-containing gases (SL), in particular dust-laden air, into the at least one inlet (4) of the suction device (5);

- Guidance and treatment of dust and / or dust gases (SL) in dedusting system (1);

characterized,

in that the dust and / or the dust-containing gas (SL) in the surrounding area (7) of the inlet (4) in the suction device (5) and / or within the suction device (5) are moistened with steam (D).

Method according to claim 1,

characterized,

that the dust and / or the dusty gas (SL) is moistened with steam (D) with the following parameters:

The method of claim 1 or 2, wherein the

Fibrous web production environment (2) at least a portion of a Machine for producing a fibrous web, in particular

Fibrous web manufacturing machine (25) and the machine comprises at least one with steam (D) heatable cylinder and a steam / condensate system associated therewith;

characterized,

in that the steam (D) used for moistening is taken from the steam / condensate system of the at least one steam-heated cylinder of the machine (25) for producing a fibrous web (F).

Method according to one of the preceding claims, wherein the fibrous web production environment (2) at least a portion of a machine (25) for producing a fibrous web (F), in particular

A fibrous web manufacturing machine, wherein the machine (25) comprises a hot air operable drying device with at least one outlet for exhaust air;

characterized,

in that the steam (D) used for moistening is generated by utilizing the waste heat of the exhaust air from the drying device which can be operated with hot air.

Sucking dust and / or dust-containing gases (SL), in particular air, into the at least one inlet (4) of the suction device (5);

- Guidance and treatment of dust and / or dusty gases (SL) in dedusting system (1);

characterized, that dust and / or dust-containing gas (SL) in the surrounding area (7) of the inlet (4) of the suction device (5) is moistened with an atomized fluid (FL).

Method according to one of the preceding claims,

characterized,

the moistening takes place in such a way that the dust and / or the dust-containing gas (SL) is characterized by a relative humidity in the range from 40% to 65%, preferably 55% to 65%.

Method according to one of the preceding claims,

characterized,

in that the dust and / or the dusty gas (SL) in the surrounding area (7) of the inlet (4) of the suction device (5) is humidified by a radius (r) in the range of 15 ° to 180 ° about one extent of the inlet (4) in the fibrous web manufacturing environment (2) is characterized.

Method according to one of the preceding claims, wherein the

Fibrous web manufacturing environment (2) describes a surrounding area of a fibrous web (F) movable along a web guide path (3);

characterized,

that dust and / or dust-containing gas (SL) is sucked in at least in the fibrous web production environment (2) on one side of the fibrous web (F), preferably on both sides (Fu, F ₀ ) of the fibrous web (F)

Method according to one of the preceding claims,

characterized,

that the dust and / or the dust-containing gas (SL) with respect to at least one of the following sizes

- One, the amount at least indirectly characterizing size - One, the properties at least indirectly characterizing size

one, the process parameters at least indirectly characterizing size

with steam (D) and / or atomized fluid (FL) constant over at least a portion of the extent of the fibrous web production environment (2) transversely to the guide direction and / or in the guide direction of

Fibrous web (F) is acted upon.

Method according to one of the preceding claims,

characterized,

- One, the amount at least indirectly characterizing size

- One, the properties at least indirectly characterizing size

one, the process parameters at least indirectly characterizing size

is applied with steam (D) and / or atomized fluid (FL) variably over at least a portion of the extension of the fibrous web production environment (2) transversely to the guide direction and / or in the guide direction of the fibrous web (F).

Method according to one of the preceding claims,

characterized,

the moistening of the dust and / or the dust-containing gas (SL) is controlled, preferably regulated.

Method according to claim 1 1,

characterized,

in that control is at least indirectly dependent on the concentration of dust in the pulp web environment (2)

characterizing size takes place.

13. dedusting system (1), in particular Staubesammel- and

A treatment system for a fibrous web manufacturing environment (2) comprising at least one suction device (5) extending over at least a portion of the extent of the fibrous web manufacturing environment (2) and having at least one inlet (4), comprising at least one dust treatment and processing device (9) / or dust-containing gas (SL) is connected;

characterized,

in that moistening device (10) discharging at least one vapor (D) and / or atomized fluid (FL) is arranged in the surrounding area (7) of the inlet (4) in the suction device (5) and / or within the suction device (5).

Dedusting system (1) according to claim 13,

characterized,

in that the at least one moistening device (10) is arranged and designed to be suitable for steam (D) with the following parameters:

Steam at a pressure p (ü) in the range of 0.1 bar to 16 bar, preferably 0.1 bar to 3 bar, wherein p (ü) = overpressure and overheating in the range of 5 ° C to 100 ° C, preferably 5 ° C to 20 ° C or saturated steam with a pressure p (ü) or

atomized fluid, in particular water, which is at a pressure between

50 bar to 100 bar is injected,

deploy.

Dedusting system (1) according to claim 13 or 14,

characterized,

in that the individual moistening device (10) is arranged in a surrounding area (7) of the inlet (4) in the suction device (5), which is surrounded by a radius (r) in the range of 15 ° to 180 ° about one, the extent of the Inlet (4) in the fibrous web manufacturing environment descriptive theoretical axis is characterized.

16. dedusting system (1) according to any one of claims 13 to 15,

characterized,

in that at least one suction device (5) is provided, which extends at least over a partial region, preferably over the entire extent of the fibrous web production environment (2), in particular transversely to the guide direction of the fibrous web (F).

17. dedusting system (1) according to any one of claims 13 to 16,

characterized,

in that a plurality of suction devices (5) are provided, wherein the individual suction devices (5) within the fibrous web production environment (2) in the guiding direction of the

Fibrous web (F) viewed in series one behind the other and / or transversely to the guide direction of the fibrous web (F) are arranged in series next to each other. 18. dedusting system (1) according to any one of claims 13 to 17,

characterized,

in that in the fibrous web production environment (2) on both sides of the fibrous web (F) suction devices (5) are arranged. 19. dedusting system (1) according to any one of claims 13 to 18,

characterized,

in that at least one individual moistening device (10) is provided, which extends at least over a partial region, preferably over the entire extent of a single suction device (5), within this or the inlet (4).

20. dedusting system (1) according to any one of claims 13 to 16, characterized,

a plurality of moistening devices (10) are provided which are arranged one behind the other in the guide direction of the fibrous web (F) and / or transversely to the guide direction of the fibrous web (F) over the entire extent of the suction device (5) within the latter or the inlet (4). arranged upstream. Dedusting system (1) according to one of claims 13 to 20,

characterized,

in that a single moistening device (10) and / or a plurality is connected to a supply unit (14) for steam (D) and / or fluid (FL).

Dedusting system (1) according to one of claims 13 to 21,

characterized,

at least part of the individual suction devices (5) and / or humidifying devices (10) can be controlled individually.

Dedusting system (1) according to one of claims 13 to 21,

characterized,

in that at least part of the individual suction devices (5) and / or moistening devices (10) can be activated in groups or jointly.

Use of a dedusting system (1) according to one of Claims 13 to 23 in a fibrous web production machine, in particular

Tissue machine (25).