DE19946575A1 - Assembly for the separation of gas from a fiber suspension has a main and a secondary dividing wall in the container with underpressure to recirculate the suspension and direct gas-free suspension into a dwell zone - Google Patents

Abstract

The appts. (1) for the removal of gas from a fiber suspension (2) has a longitudinal container (3), with an underpressure, for the suspension to flow (S) through, with a main dividing wall (16) forming an upper overflow edge (17) forming an overflow (15), and a secondary dividing wall (24) with an upper edge (25) for the gas-free suspension (2) to the outlet (21). The back-up height (HSH) of the main dividing wall (16) is higher than the back-up height (NSH) of the secondary dividing wall (24). The outlet (21) for the gas-free suspension (2) is followed by a hydraulic stabilizer (28). The hydraulic stabilizer (28) for the gas-free suspension (2) is a dwell vessel to give a set dwell time and dwell vol., with an inner contour structured for the optimum suspension flow characteristics. The inner contour is pref. a longitudinal and prone cylinder, or a conical tube (29) aligned on the suspension flow direction (S). The horizontal cylinder, as a hydraulic stabilizer, has an inlet for the fiber suspension (2) from the overflow formed by the secondary dividing wall (24) into the outlet (21), defined by a leading (22) and a trailing (23) edge. The secondary dividing wall (24) is at the same level as the leading edge (22) of the outlet (21) for the gas-free suspension. The hydraulic stabilizer is directly or indirectly after the outlet (21) from the gas removal stage, with a tube or hose link. The suspension dwell time in the stabilizer is 2-60 secs. and pref. 5-20 secs. The vol. of gas-free suspension dwelling in the stabilizer is 0.8-100.0 m<3> and pref. 4-70 m<3>. The overflow from the main dividing wall (16) passes through an outlet (16) for recirculation, where the wall is at the same level as the leading edge (19) of the outlet and at the same level as the trailing edge (23) of the outlet (21) for gas-free suspension. The upper edges (17,25) of the main (16) and/or secondary (24) dividing walls are aligned against the direction (S) of the suspension (2) flow, using divided walls where their upper sections can be pitched at the required angles. The main (16) and/or secondary (24) dividing walls, on a vertical plane in relation to the suspension level (6), are in parallel with a curvature or an angle, and the edges (22,23) of the outlet (21) for gas-free suspension are rounded (26) or chamfered. The underpressure is generated within the container (3) by an underpressure connection (9), an underpressure channel (10) and at least one underpressure pump (11) and channel (12). A number of jets (13) moisten the inner surfaces (14) of the container (3) where the fiber suspension (2) is not in contact.

Description

The invention relates to a device for degassing fiber suspension according to the preamble of claims 1, 2 and 5.

The quality of a finished paper or cardboard is next to the basic ones Properties that change according to the area of application of the paper or cardboard change, essentially by the uniformity of these properties over the ge determined across the entire surface. This includes the same mass ver as possible division over the area and, with the same mass per area, also the same moderate distribution of ingredients, such as fibers and ash, and the spatial orientation of the fibers (formation or fiber ori cross profile). In order to achieve this, one tries to get one as possible to produce a uniform pulp suspension flow and to the headbox a paper or board machine. This pulp suspension stream on the one hand, must be as constant as possible with regard to its volume and mass flow, so be free of pulsations. On the other hand, the pulp suspension stream the same composition as possible also over the flow cross-section have, that is, in other words, it should in the pulp suspension stream there are no signs of segregation.

Various and complex measures are known, which are unequal moderate distribution of solids in the fiber suspension in the area of Compensate headbox and thus not equalizing one to achieve optimal basis weight cross-section. In this regard, at playfully on the German laid-open documents DE 37 41 603 A1 (PA 04490 DE),  DE 40 19 593 A1 (PA 04598 DE) or DE 196 50 588 A1 (PA 10446 DE) der Applicant pointed out.

Different devices for avoidance or for sub Binding of pulsations in the pulp suspension stream are also out of number known publications. On the one hand it is possible to use the existing pulsa in the feed system to the headbox, consisting of pipes and Pumping, to reduce, on the other hand, it is also possible to prevent the emergence of Pulsations at the point of origin, for example in the device for ent gases from fiber suspension to prevent. Pulsation devices Reduction in the feed system to the headbox are for example from the two unpublished German patent applications DE 198 19 330.0 (PA 10721 DE) and DE 198 45 898.3 (PA 10780 DE) of the applicant, where on the other hand, devices for preventing pulsations in devices for Degassing of fiber suspensions from the two German disclosures publications DE 32 19 740 A1 and DE 42 34 522 A1 and the US patent 5,868,905 (PA 10542 US) are known.

It can be generally stated that devices for degassing of fiber suspensions best among the experts in the industry the brand A.Ahlstrom Corporation DECULATOR® are known. Your The devices are said to degas pulp suspensions. Soon other light impurities are also removed from the devices at an early stage that would otherwise disrupt paper or cardboard manufacturing. The before directions are large containers that the paper or board machine opens giving fiber suspension is fed as a thin mixture. The radio tion principle of the device is the fiber suspension under sub to let the pressure boil and thereby the gas into a so-called gas space and to separate from the container and the other light contaminants the liquid surface in the container. The paper on the other hand, fibrous material suspension to be fed in is fed through  taken an opening in the bottom of the container, which of course with the thought is connected, if possible, to remove gas-free fiber suspension from the container conduct. In order to maximize the degassing ability of the device, Be container generates a negative pressure by means of a pump, the gas through the Un terdruckpumpe (vacuum pump) escapes from the container with line. About that In addition, the degassing ability is improved by the added gas containing fiber suspension through jet pipes above the liquid stands in the container is entered, which in the added fiber suspension gas possibly present as bubbles is already separated, be before the added fiber suspension with the existing fiber material suspension comes into contact. Except for stabilizing the liquid stands becomes the (only) overflow for removal on the liquid surface surface of the container is used to collect light contaminants do not get to the paper or cardboard machine. The light impurities flow over the (single) overflow to the outlet and then to the further processing action where efforts are made to separate them from the fiber suspension and return the pulp suspension to the cycle.

The aforementioned German published patent application DE 32 19 740 A1 discloses one Device for degassing pulp suspension according to the aforementioned Preamble of the present invention. The distribution pipe and the flow in the The interior of the same are opposed to the flow inside the container directs, the flow cross-section of area in the container in the Rich direction decreases to the end where the jet pipes are and the decreasing flow cross section at least over the area of a jet pipe extends.

The disadvantage of this device is that complete prevention of ent standing pulsations due to the direct spatial connection between the gas-free fiber suspension in the tank bottom and the Outlet connection including drain pipe for the gas-free fiber suspension not possible is. The disclosed invention has a positive effect on the prevention of  arising pulsations, but can completely prevent the not guarantee the same.

Furthermore, a German Ent is published in DE 42 34 522 A1 Gassing container, consisting of the container itself, an arranged therein, the partition forming the overflow and connecting piece arranged in the container jacket for input medium, gas-free medium, separated gas and by means of the Medium overflow separated, disclosed. The partition is essentially level with the rear edge of the outlet connection for gas-free medium arranged.

The disclosed device has the disadvantage that, as already mentioned in the DE 32 19 740 A1, a complete suppression of the resulting Pulsations due to the direct spatial connection between the in the Be contain gas-free fiber suspension and the outlet nozzle including drain pipe for the gas-free fiber suspension is not possible.

Furthermore, US Pat. No. 5,868,905 discloses a device for degassing of fiber suspension with one each before the outlet nozzle for the abge different medium and for the gas-free medium attached partition, where the gas-free fiber suspension in the tank bottom from the outside the spigot for the gas-free medium is spatially separated and therefore the widest no pulsations are transmitted.

The partition in front of the outlet connection for the gas-free medium partially prevents the development of pulsations, but it can due to the lack of buffer capacity for the gas-free medium in the following Do not completely stop the pipeline.

It is therefore an object of the invention to provide a device of the type mentioned to create with which the development of pulsations in the area of the device device for degassing fiber suspension at the simplest possible, cost cheap and reliable way is prevented, the quality of the  Pulp suspension to be fed to paper or board machine and the Uniformity of the process or the aforementioned properties improved and also in the end product, i.e. the paper or the cardboard, even none due to the malfunctions of the device for degassing from Quality problems related to suspension of the suspension occur.

According to the invention, this object is achieved in a device according to the Oberbe handle of claims 1 and 2 solved in that the accumulation height of the main partition wall is greater than the damming height of the secondary partition and that the outlet a hydraulic stabilizer for gas-free fiber suspension is arranged.

This results in the aerodynamic advantages that first of all outlet connection through the secondary partition from which are in the bottom of the container the gas-free fiber suspension is spatially and effectively separated that secondly, "calmed" gas-free fiber suspension is fed to the outlet nozzle is, the gas-free, but with slight impurities, such as Plastics and the like, provided fiber suspension over the main partition is separated, and that third, the hydraulic stabilizer Has buffer capacity for the gas-free fiber suspension and thereby prevents the occurrence of pulsations.

In a continuation of the inventive concept, the hydraulic stabilizer is for the gas-free fiber suspension is a retention tank with a certain Ver dwelling time and with a certain dwell volume, whereby it also flows technically optimal inner contour. The optimal flow technology Inner contour is the contour of an elongated or lying cylinder or a conical aligned in the flow direction of the fiber suspension Tube. This hydraulic stabilizer is particularly suitable for new systems for degassing fiber suspensions, their constructive basis for the respective container construction in the aforementioned US patent 5,868,905 (PA 10542 US) are disclosed.  

Furthermore, this object is achieved in a device according to the invention Preamble of claim 5 solved in that the outlet nozzle for gas-free Fibrous suspension a retention tank in the form of a hydraulic stabilizer sators with a certain dwell time and with a certain dwell time volume is subordinate, consisting of an elongated and lying cylindrical container, at least one inlet nozzle for inserting from the - upstream - seen in the flow direction of the fiber suspension Device coming fiber suspension into the container, one - in stream seen direction of the fiber suspension - nachge the inlet nozzle arranged, an overflow forming secondary partition with an upper edge and with a damming height, one - seen in the flow direction of the fiber suspension - outlet connection for gas-free fiber stock downstream of the secondary partition pension with a leading edge and a trailing edge, one - in the direction of flow seen the fiber suspension - the outlet nozzle for gas-free fiber main partition with an upper edge and a Damming height, the damming height of the main partition wall being greater than the damming height the secondary partition, a - ge in the flow direction of the fiber suspension see - the outlet connection downstream of the main partition for returning the excess fiber suspension that has entered the container back into the Circuit with a leading edge and means for generating a vacuum in the Container.

This gives the fluidic advantage that the location of the possible Emergence of pulsations both spatially and effectively from the Ent take point of the gas-free fiber suspension is separated. It also affects the existing secondary partition also had a positive effect on the prevention of Pulsa tion. The outlet port of the hydraulic stabilizer is "be calmed "gas-free fiber suspension, the gas-free, but with light impurities, such as plastics and the like, ver see fiber suspension is separated over the main partition. About this gives the hydraulic stabilizer a buffer capacity for the gas-free company  Hydrogen suspension, which also causes the formation of pulsations is prevented.

This second hydraulic stabilizer according to the invention is particularly suitable for conversions or extensions of existing ones Devices for degassing fiber suspensions, such as those are disclosed in the aforementioned German published patent application DE 32 19 740 A1.

In a further continuation of the inventive concept, it is also proposed that the hydraulic stabilizer the outlet nozzle for gas-free pulp pension is subordinated directly or indirectly.

The preferred agent according to the invention between the outlet port for gas free fiber suspension and the hydraulic stabilizer is at least one Hose or a pipe, since both means mentioned advantages in terms of Bring investment costs, maintenance intensity and operational security.

In a further embodiment of the invention it is provided that, based on design considerations for the constant part of a paper or board machine, the residence time of the fiber suspension in the hydraulic stabilizer is between 2 and 60 seconds, preferably between 5 and 20 seconds, and the residence volume of the gas-free fiber suspension in the hydraulic stabilizer between 0.8 and 100 m ³ , preferably between 4 and 70 m ³ . These dimensions have the advantage that they ensure an optimal design of the above constant part and an optimal operation of the paper or board machine with regard to runnability and the like.

In further embodiments of the invention it is provided that the main separator wall was substantially level with the front edge of the outlet port to return the excess pulp that has entered the container Pension is arranged back in the circuit or that the main partition is on same height with the front edge of the outlet nozzle to return the in  Excess fiber suspension entered back into the container Circuit is arranged, and / or that the main partition essentially on same height with the rear edge of the outlet connection for gas-free fiber material Suspension is arranged or that the main partition with the same height the rear edge of the outlet nozzle for gas-free fiber suspension is net, and / or that the secondary partition is at substantially the same height the front edge of the outlet nozzle for gas-free pulp suspension net or that the secondary partition is level with the front edge of the Outlet connector for gas-free fiber suspension is arranged. This attached further embodiments of the invention all result in the advantage of a further improved device for degassing fiber suspension visually the fluidic properties, with maintenance friendliness and the runnability of the device can be improved.

In a preferred embodiment of the invention it is provided that the upper edge the main partition and / or the secondary partition against the flow direction of the fiber suspension is directed. Advantageous in this orientation is that they both the functional reliability of the device according to the invention positively supported as well as fluidic advantages with regard to the sub binding of pulsations.

It is also advantageous if the main partition and / or the secondary Partition is composed of at least two partitions, which are in one Angular position are arranged to each other. This will make the constructive and static requirements, in particular the rigidity, of the device very well taken care of.

Regarding the course of the main partition and / or the secondary partition it turned out to be advantageous if - in vertical, perpendicular to the liquid level seen in the plane of the container - parallel, at an angle,  are curved or angled because all of these courses are the tie-down by promoting pulsations.

In a further special embodiment for positively influencing the Un Connection of pulsations is suggested, the leading edge and the trailing edge edge of the outlet nozzle for gas-free fiber suspension with a curve or a chamfer, as this is an optimal flow technology Show edge profile.

It is also advantageous according to the invention if the means for generating the Vacuum in the container one vacuum connection, one vacuum line and are at least one vacuum pump with line. It goes without saying that several vacuum connections each individually with a separate sub pressure line and a separate vacuum pump with line as well individual vacuum lines and a common vacuum pump with Line can be operated.

In a further advantageous embodiment of the invention it is provided that in upper interior of the container several nozzles for moistening the not Fibrous suspension touching the container inner surface are attached where due to the process of degassing the fiber pulp in the container sion is positively influenced in terms of process speed and efficiency.

It is understood that the above and below still apply purifying features of the invention not only in the specified combination nation, but can also be used in other combinations or alone are without departing from the scope of the invention.

Further features and advantages of the invention result from the Unteran say and the following description of preferred embodiments with reference to the drawing.  

Show it

Figure 1 is a schematic and sectional side view of a geous embodiment of the device according to the invention for degassing a fiber suspension.

Fig. 2 is a schematic and sectional side view of a second advantageous embodiment of the device according to the invention for degassing a fiber suspension;

Fig. 3 is a schematic and sectional side view of a third advantageous embodiment of the device according to the invention for degassing a fiber suspension;

Fig. 4 is a schematic and sectional side view of a four th advantageous embodiment of the device according to the invention for degassing a fiber suspension, similar to Fig. 3;

Figure 5 is a schematic and sectional side view of a five th advantageous embodiment of the device according to the invention for degassing a fiber suspension. and

Fig. 6 is a schematic and sectional side view of a sixteenth most advantageous embodiment of the apparatus of the invention for degassing a fibrous suspension, similar to Fig. 5.

Fig. 1, according to the apparatus 1 according to the invention consists for degassing a fibrous suspension 2 of an elongated and horizontal cylindrical container 3 with a container axis 3 a, to which the paper or board machine discontinued pulp suspension 2 as a thin mixture of at least one to the container axis 3 a parallel Distribution pipe 4 , from which a plurality of successive jet pipes 5 for introducing fiber suspension 2 into the container 3 , is fed. The flow direction S of the fiber suspension 2 is shown with an arrow above. In order to improve the degassing ability of the device 1 , the supplied, still gas-containing fibrous suspension 2 is entered through jet pipes 5 above the liquid level 6 in the container 3 , the gas 7 possibly present as bubbles in the added fiber suspension 2 already being separated, before the added pulp suspension 2 is used in conjunction with the already existing in the container 3 pulp suspension. 2 The jet tubes 5 end in the illustrated and preferred embodiment shortly before the container ceiling 8 , whereby the degassing process of the fibrous suspension 2 is again supported positively, since the fibrous suspension 2 collides with the container ceiling 8 . The fiber suspension 2 can also be supplied by means of a chamber system, as shown in FIG. 3 and described in more detail. In the upper area of the container ceiling 8 , a vacuum connection 9 with a vacuum line 10 is attached, which in turn is connected to a vacuum pump 11 with a further line 12 , not shown completely; the vacuum connection 9 can alternatively also be attached in the lateral region of the container ceiling 8 . By connecting the container 3 to the vacuum pump 11 , the degassing ability of the device 1 is maximized, the gas 7 being pumped out of the container 3 by the vacuum pump 11 . Furthermore, in the area of the container ceiling 8 facing away from the jet pipes 7, a plurality of nozzles 13 (not shown in more detail) for moistening the container inner surface 14 not in contact with the fiber suspension 2 are attached. By this measure, the degassing process taking place in the container 3 of the solvent suspension 2 is positively influenced in terms of process speed and efficiency. In the part of the container 3 facing away from the distribution pipe 4 there is a main partition 16 forming an overflow 15 with an upper edge 17 and with a storage height H _SH . Downstream of the main partition 16 - seen in the direction of flow of the fiber suspension 2 - is an outlet connection 18 with a front edge 19 . The outlet nozzle 18 is an initially shown line system 20 for returning the excess 3 s in the container 3 , mixed with light impurities fiber suspension 2 back into the circuit, not shown, but known to the skilled worker. The main partition 16 is arranged upstream - seen in the flow direction of the fiber suspension - an outlet nozzle 21 for gas-free fiber suspension 2 with a front edge 22 and a rear edge 23 , the outlet nozzle 21 - viewed in the flow direction of the fiber suspension - an auxiliary partition 24 with an upper edge 25 and is pre-arranged with a storage height N _SH . The rear edge 22 and the front edge 23 are provided in FIG. 1 with a curve 26 , alternatively both edges 22 , 23 can also be provided with a chamfer 27 , as can be seen, for example, in FIG. 5. With regard to the arrangement of the outlet ports 18 and 21 together with their front edges 19 and 22 and rear edge 23 and the partitions 16 and 24 , the above statements made in the descriptive general part of the present invention apply.

According to the invention, the device 1 is now characterized in that the accumulation height H _{SH of} the main partition 16 is greater than the accumulation height N _{SH of} the secondary partition 24 and that a hydraulic stabilizer 28 is arranged downstream of the outlet connection 21 for gas-free fiber suspension 2 . In Fig. 1 it is shown that the hydraulic stabilizer 28 is immediately downstream of the outlet port 21 . The hydraulic stabilizer 28 shown for the gas-free pulp suspension 2 is used as a retention tank and has the shape of a conical tube 29 aligned in the flow direction S of the pulp suspension 2 . The hydraulic stabilizer 28 is designed according to the invention such that the residence time V _{D of} the gas-free fiber suspension 2 in it is between 2 and 60 seconds, preferably between 5 and 20 seconds, and that the residence volume V _{V of} the gas-free fiber suspension 2 in it is between 0. 8 and 100 m ³ , preferably between 4 and 70 m ³ . The hydraulic stabilizer 28 is arranged after a pump, not shown, which feeds the fiber suspension 2 to the headbox, not shown, of a paper or board machine under pressure. A sifter, in particular a vertical sifter, can be arranged between the hydraulic stabilizer 28 and the pump (not shown) in order to improve the quality of the fiber suspension 2 .

FIG. 2 shows a schematic and sectional side view of a second advantageous embodiment of the device 1 according to the invention for degassing a fiber suspension 2 , the container 3 , apart from a few small structural differences, being identical to the container 3 according to FIG. 1. The small design differences are, for example, the lateral arrangement of the vacuum system with vacuum connection 9 , vacuum line 10 , vacuum pump 11 and line 12 , or the lateral attachment of the outlet connector 18 , its front edge 19 and the following line system 20th

The "larger" difference according to the invention from Fig. 1 is that in Fig. 2 the immediately downstream of the outlet connector 21 hydraulic Stabili sator 28 is also designed as a retention tank, but which has the shape of an elongated and lying cylindrical container 30 . In Fig. 2 bil the container axis 3 a and the longitudinal axis of the container 30, not shown, an angle of 90 ° to each other; it goes without saying that the said angle can have any value between 0 ° and 360 °. With regard to the design of the elongated and lying cylindrical container 30 according to the invention, the comments made on FIG. 1 apply.

For the sake of completeness, it should be pointed out that the container 3 described in FIGS. 1 and 2 together with a large part of the components and groups which are connected to it are sufficiently known to the person skilled in the art, for example from the aforementioned US patent 5,868,905 or the "Multi Retention DECULATOR®" brochure from Ahlstrom Machinery Corporation.

A schematic and sectional side view of a third advantageous embodiment of the device 1 according to the invention for degassing a fiber suspension 2 is shown in FIG. 3. The container 3 together with the components and groups of the device 1 shown is known to the person skilled in the art as the "Fly ing Wing DECULATOR®" from Ahlstrom Machinery Corporation, which is also described in US Pat. No. 3,538,680 (≈ DE-A 17 61 496). is disclosed. The content of this US patent is hereby made the subject of this description. The supply of the fibrous suspension 2 into the container 3 takes place by means of four chamber 31 communicating with the container 3 and supplying it to the fibrous suspension 2 , only two chambers 31 being indicated schematically. The communicating chambers 31 are above the liquid level 6 of the supplied fiber suspension 2 in the container 3 . As already be described in FIG. 1, a main partition 16 and a secondary partition 24 are disposed in the container 3, in turn, are in the manner already described, with the outlet port 18 and 21 in combination. According to preferred embodiments of the invention, the main partition 16 is curved, the secondary partition 24 consists of two partition parts 32 a and 32 b, where the partition wall part 32 b of the secondary partition 24 is directed against the flow direction S of the fiber suspension 2 . The outlet connection 18 is arranged as in FIG. 2.

According to the outlet port 21 is a hydraulic Stabili sator 28 immediately downstream, which is also designed as a retention tank and which has the shape of an elongated and lying cylindrical container 30 . The hydraulic stabilizer 28 in FIG. 3 is structurally identical to the hydraulic stabilizer 28 shown in FIG. 2 and therefore does not require any further description. The container axis 3 a and the longitudinal axis of the container 30 , not shown, form an angle of 90 ° to one another.

Fig. 4 shows the device 1 according to the invention for degassing a fiber suspension 2 similar to Fig. 3, wherein the two partitions 16 and 24 are integrally and linearly formed, the outlet nozzle 18 runs directly down and the angle between the container axis 3 a and the longitudinal axis 33 of the hydraulic stabilizer 28 in the form of an elongated and lying container 30 is 180 °.

In FIG. 5 is a schematic and sectional side view of a fifth advantageous embodiment of the device 1 according to the invention is for unloading a fibrous suspension 2 gases shown. This embodiment of the hy draulic stabilizer 28 is particularly suitable for the conversion or for the expansion of an already existing device 1 for degassing fiber suspension 2 , as disclosed, for example, in the aforementioned German published patent application DE 32 19 740 A1.

The device 1 according to the invention for degassing fibrous suspension 2 consists of an elongated and lying cylindrical container 3 with a container axis 3 a, to which the fibrous suspension 2 to be fed to the paper or board machine is used as a thin mixture via at least one distribution pipe 4 , of which a plurality of successive jet pipes 5 for introducing fiber suspension 2 into the container 3 , is supplied. With regard to the other structural properties as referred to the container 3 shown in Fig. 1. An outlet connection 21 for gas-free fiber suspension 2 with a front edge 22 and a rear edge 23 in the container 3 in its container base 34 is assigned. Furthermore, means for generating a negative pressure in the container 3 in the form of a negative pressure connection 9 , a negative pressure line 10 , a negative pressure pump 11 and a further line 12 are arranged in the vicinity of the container ceiling 8 . Furthermore, the container cover are internally surface to moisten the non-touched with pulp suspension 2 the container 8 is mounted a plurality of nozzles, not shown in the jet pipes 13 14 7 from facing area.

According to the invention, the device 1 is now characterized in that the outlet connection 21 for gas-free fiber suspension 2 is followed by a dwell tank in the form of a hydraulic stabilizer 28 with a certain dwell time V _D and with a certain dwell volume V _V by means 35 . This hydraulic stabilizer 28 consists of an elongated and lying cylindrical container 30 with at least one inlet nozzle 36 for introducing coming from the - see in the flow direction S of the fibrous suspension 2 - upstream device 1 coming fibrous suspension 2 in the container 30th In the container 30 - as seen in the flow direction S of the fibrous suspension 2 - a secondary partition 24 downstream of the inlet connection 36 is arranged with an upper edge 25 and with a damming height N _SH . Furthermore, the secondary partition wall 24 - seen ge in the flow direction of the fibrous suspension - an outlet nozzle 21 for gas-free fibrous suspension 2 with a leading edge 22 and a trailing edge 23 , and this outlet nozzle 21 - seen in the flow direction S of the fibrous suspension 2 - is again a main partition 16 with an upper edge 17 and with an accumulation height H _SH , where the accumulation height H _{SH of} the main partition wall 16 is greater than the accumulation height N _{SH of} the secondary partition wall 24 . Finally - seen in the flow direction of the fibrous suspension - the main partition 16 has an outlet connection 18 with a leading edge 19 and an initially shown conduit system 20 for returning the excess fibrous suspension 2 that has occurred in the container 3 back to the circuit, not shown. In the upper area of the container ceiling 8 Be a vacuum connection 9 is introduced with a vacuum line 10 , which in turn is connected to a vacuum pump 11 with a further, not fully shown line 12 ; the vacuum connection 9 can alternatively be attached in the lateral region of the container ceiling 8 . As shown in Fig. 5, the means for He generating a negative pressure in the containers 3 and 30 may be formed jointly by a single vacuum pump 11. The gas-free fiber suspension can, as already mentioned above, be fed directly or indirectly to the headbox of a paper or board machine.

Fig. 6 shows a schematic and sectional side view of a sixth advantageous embodiment of the device 1 according to the invention for degassing a fibrous suspension 2 , similar to FIG. 5. The container 3 shown corresponds to the container 3 shown in FIG. 3 in a different view; with regard to its description, reference is therefore made to FIG. 3. The container 30 shown corresponds to the container 30 shown in Figure 5 in the same view. with regard to its description, reference is therefore made to FIG. 5. This embodiment of the hydraulic stabilizer 28 is particularly suitable for the conversion or extension of an existing device 1 for degassing fiber suspension 2 , as disclosed, for example, in the aforementioned German published patent application DE 32 19 740 A1.

In summary, it should be noted that by the invention a device of is created with which the emergence of Pulsa tion in the area of the device for degassing fiber suspensions is prevented as simply, cheaply and reliably as possible, the quality of the fiber to be fed to the paper or board machine stock suspension and the uniformity of the process or the aforementioned Properties are improved, and also in the end product, that is the Pa pier or the carton itself, none due to the malfunction of the device quality problems related to the degassing of the fiber suspension occur.  

Reference list

1

Device (for degassing fiber suspension)

2nd

Fibrous suspension

3rd

container

3rd

a container axis

4th

Manifold

5

Nozzle

6

Fluid level

7

gas

8th

Container ceiling

9

Vacuum connection

10th

Vacuum line

11

Vacuum pump

12th

management

13

jet

14

Inner surface of the container

15

Overflow

16

Main partition

17th

Top edge

18th

Outlet connection

19th

Leading edge

20th

Pipe system

21

Outlet connection

22

Leading edge

23

Trailing edge

24th

Secondary partition

25th

Top edge

26

Rounding

27

Chamfer

28

Hydraulic stabilizer

29

Tapered tube

30th

container

31

chamber

32

a,

32

b Part of the partition

33

Longitudinal axis

34

Tank bottom

35

medium

36

Inlet connection
H _SH

Damming height
N _SH

; Damming height
S flow direction
V _D

Length of stay
V _V

Dwell volume

Claims (22)

1. Device ( 1 ) for degassing fiber suspension ( 2 ) consisting of

• - An elongated and lying cylindrical container ( 3 ) with a container axis ( 3 a);
• - At least one to the container axis ( 3 a) parallel or approximately parallel distribution tube ( 4 ) which is outside or inside the container ( 3 ) and from which a plurality of successive jet tubes ( 5 ) for introducing fiber suspension ( 2 ) in the Run out container ( 3 );
• - In the container ( 3 ) arranged, an overflow ( 15 ) forming the main partition ( 16 ) with an upper edge ( 17 ) and with a storage height (H _SH );
• - a - seen in the flow direction (S) of the fibrous suspension (2) - the main partition (16) downstream outlet nozzle (18) for to the occurrence in the container (3) excess fibrous recirculate suspension (2) back into the cycle having a leading edge (19 );
• - One - seen in the flow direction (S) of the fiber suspension ( 2 ) - the main partition ( 16 ) upstream outlet connector ( 21 ) for gas-free fiber suspension ( 2 ) with a front edge ( 22 ) and a rear edge ( 23 );
• - One - seen in the flow direction (S) of the fibrous suspension ( 2 ) - the outlet connection ( 21 ) for gas-free fibrous suspension ( 2 ) vorgeord Neten side partition ( 24 ) with an upper edge ( 25 ) and with a damming height (N _SH );
• - Means for generating a vacuum in the container ( 3 );

characterized by
that the accumulation height (H _SH ) of the main partition ( 16 ) is greater than the accumulation height (N _SH ) of the secondary partition ( 24 ) and
that the outlet port ( 21 ) for gas-free fiber suspension ( 2 ) is a hy draulic stabilizer ( 28 ). 2. Device ( 1 ) for degassing fiber suspension ( 2 ), consisting of

• - An elongated and lying cylindrical container ( 3 );
• - At least one with the container ( 3 ) communicating and their fiber suspension ( 2 ) feeding chamber ( 31 ), the communicating chamber ( 31 ) above the liquid level ( 6 ) of the supplied fiber suspension ( 2 ) in the container ( 3 ) ;
• - In the container ( 3 ) arranged, an overflow ( 15 ) forming the main partition ( 16 ) with an upper edge ( 17 ) and with a storage height (H _SH );
• - a - seen in the flow direction (S) of the fibrous suspension (2) - the main partition (16) downstream outlet nozzle (18) for to the occurrence in the container (3) excess fibrous recirculate suspension (2) back into the cycle having a leading edge (19 );
• - One - seen in the flow direction ( 5 ) of the fiber suspension ( 2 ) - the main partition ( 16 ) upstream outlet connector ( 21 ) for gas-free fiber suspension ( 2 ) with a front edge ( 22 ) and a rear edge ( 23 );
• - One - seen in the flow direction (S) of the fibrous suspension ( 2 ) - the outlet connection ( 21 ) for gas-free fibrous suspension ( 2 ) vorgeord Neten side partition ( 24 ) with an upper edge ( 25 ) and with a damming height (N _SH );
• - Means for generating a vacuum in the container ( 3 );

characterized,
that the accumulation height (H _SH ) of the main partition ( 16 ) is greater than the accumulation height (N _SH ) of the secondary partition ( 24 ) and
that the outlet port ( 21 ) for gas-free fiber suspension ( 2 ) is a hy draulic stabilizer ( 28 ). 3. Device ( 1 ) one of the preceding claims, characterized in that the hydraulic stabilizer ( 28 ) for the gas-free fiber suspension ( 2 ) is a retention tank with a certain residence time V _D and with a certain retention volume V _V and a flow-technically optimal In nenkontur having. 4. The device ( 1 ) according to claim 3, characterized in that the aerodynamically optimal inner contour is the contour of an elongated and lying cylinder or one in the flow direction (S) of the fiber suspension ( 2 ) aligned conical tube ( 29 ). 5. Device ( 1 ) for degassing fiber suspension ( 2 ) consisting of

• - An elongated and lying cylindrical container ( 3 ) with a container axis ( 3 a);
• - With at least one to the container axis ( 3 a) parallel or at approximately parallel distribution pipe ( 4 ), which is outside or inside the container ( 3 ) and from which a plurality of successive jet pipes ( 5 ) for introducing fiber suspension ( 2 ) in Be the container ( 3 ) go out, or with at least one with the container ( 3 ) communicating and its fiber suspension ( 2 ) feeding chamber ( 31 ), the communicating chamber ( 31 ) above the liquid level ( 6 ) of the fiber suspension ( 2 ) is in the container ( 3 );
• - With an outlet nozzle ( 21 ) for gas-free fiber suspension ( 2 ) with a front edge ( 22 ) and a rear edge ( 23 );
• - Means for generating a vacuum in the container ( 3 );

characterized in that the outlet nozzle ( 21 ) for gas-free fiber suspension ( 2 ) is a Ver because container in the form of a hydraulic stabilizer ( 28 ) with a certain dwell time V _D and with a certain dwell volume V _V , downstream, consisting of

• - An elongated and lying cylindrical container ( 30 );
• - At least one inlet nozzle ( 36 ) for introducing from the - viewed in the flow direction (S) of the fiber suspension ( 2 ) - upstream device ( 1 ) coming fiber suspension ( 2 ) into the container ( 30 );
• - An - seen in the flow direction (S) of the fibrous suspension ( 2 ) - the inlet connection ( 36 ) downstream, an overflow ( 15 ) forming secondary partition wall ( 24 ) with an upper edge ( 25 ) and with a damming height (N _SH )
• - One - seen in the flow direction (S) of the fiber suspension ( 2 ) - the secondary partition ( 24 ) downstream outlet connector ( 21 ) for gas-free fiber suspension ( 2 ) with a front edge ( 22 ) and a rear edge ( 23 );
• - One - seen in the flow direction (S) of the fibrous suspension ( 2 ) - the outlet connection ( 21 ) for gas-free fibrous suspension ( 2 ) downstream main partition ( 16 ) with an upper edge ( 17 ) and with a damming height (H _SH ), the damming height (H _SH ) of the main partition ( 16 ) is greater than the accumulation height (N _SH ) of the secondary partition ( 24 );
• - a - seen in the flow direction (S) of the fibrous suspension (2) - the main partition (16) downstream outlet nozzle (18) for to the occurrence in the container (3) excess fibrous recirculate suspension (2) back into the cycle having a leading edge (19 );
• - Means for generating a vacuum in the container ( 3 ).

6. Device ( 1 ) according to one of the preceding claims, characterized in that the hydraulic stabilizer ( 28 ) is directly downstream of the outlet nozzle ( 21 ) for gas-free fiber suspension ( 2 ). 7. Device ( 1 ) according to one of the preceding claims 1 to 5, characterized in that the hydraulic stabilizer ( 28 ) is indirectly arranged downstream of the outlet connection ( 21 ) for gas-free fiber suspension ( 2 ). 8. The device ( 1 ) according to claim 7, characterized in that the means between the outlet nozzle ( 21 ) for gas-free fiber suspension ( 2 ) and the hydraulic stabilizer ( 28 ) is at least one hose or a pipe. 9. Device ( 1 ) according to one of the preceding claims 3 to 8, characterized in that the residence time V _{D of} the fiber suspension ( 2 ) in the hydraulic sta bilizer ( 28 ) is between 2 and 60 seconds, preferably between 5 and 20 seconds. 10. The device ( 1 ) according to any one of the preceding claims 3 to 9, characterized in that the dwell volume V _{V of} the gas-free fiber suspension ( 2 ) in the hy draulic stabilizer ( 28 ) between 0.8 and 100 m ³ , preferably between 4 and 70 m ³ . 11. The device ( 1 ) according to any one of the preceding claims, characterized in that the main partition ( 16 ) substantially at the same level with the front edge ( 19 ) of the outlet port ( 18 ) for returning the excess fiber suspension ( 3 ) which has occurred in the container ( 3 ). 2 ) is placed back in the cycle. 12. The device ( 1 ) according to claim 11, characterized in that the main partition ( 16 ) is arranged at the same height with the front edge ( 19 ) of the outlet nozzle ( 18 ) for returning the excess fiber suspension ( 2 ) in the container back into the circuit is. 13. Device ( 1 ) according to one of the preceding claims, characterized in that the main partition ( 16 ) is arranged substantially at the same level with the rear edge ( 23 ) of the outlet nozzle ( 21 ) for gas-free fiber suspension ( 2 ). 14. The device ( 1 ) according to claim 13, characterized in that the main partition ( 16 ) is arranged at the same height with the rear edge ( 23 ) of the outlet nozzle ( 21 ) for gas-free fiber suspension ( 2 ). 15. The device ( 1 ) according to any one of the preceding claims, characterized in that the secondary partition ( 24 ) is arranged substantially at the same level with the front edge ( 22 ) of the outlet nozzle ( 21 ) for gas-free fiber suspension ( 2 ). 16. The device ( 1 ) according to claim 15, characterized in that the secondary partition ( 24 ) is arranged at the same height with the front edge ( 22 ) of the outlet nozzle ( 21 ) for gas-free fiber suspension ( 2 ). 17. The device ( 1 ) according to any one of the preceding claims, characterized in that the upper edge ( 17 , 25 ) of the main partition ( 16 ) and / or the secondary partition ( 24 ) directed against the flow direction (S) of the fibrous material suspension ( 2 ) is. 18. Device ( 1 ) according to one of the preceding claims, characterized in that the main partition ( 16 ) and / or the secondary partition ( 24 ) each consist of at least two partition parts ( 32 a, 32 b) which are arranged in an angular position to one another are. 19. Device ( 1 ) according to one of the preceding claims, characterized in that the main partition ( 16 ) and / or the secondary partition ( 24 ) - seen in verti cal, perpendicular to the liquid level ( 6 ) in the container ( 3 ) extending plane - parallel , runs at an angle, curved or angled. 20. The device ( 1 ) according to any one of the preceding claims, characterized in that the front edge ( 22 ) and the rear edge ( 23 ) of the outlet nozzle ( 21 ) for gas-free fiber suspension ( 2 ) with a curve ( 26 ) or a chamfer ( 27 ) is provided. 21. The device ( 1 ) according to any one of the preceding claims, characterized in that the means for generating the vacuum in the container ( 3 , 30 ) each have a vacuum connection ( 9 ), a vacuum line ( 10 ) and at least one vacuum pump ( 11 ) with line ( 12 ). 22. Device ( 1 ) according to one of the preceding claims, characterized in that in the upper inner region of the container ( 3 , 30 ) a plurality of nozzles ( 13 ) for moistening the non-fibrous suspension ( 2 ) container inner surface ( 14 ) are attached.