FI120551B - Projection arrangement of a paper machine or equivalent - Google Patents

Description

The present invention relates to a wrinkle system for a wet end of a paper machine or the like having a dry solids content of the web of <60% and comprising at least a forming part of the web and a pressing part, and preferably a drying part of the web. between the unloading point and the wreck tower, and comprising at least one stacking means arranged below the paper machine or the like to receive the wreck from the wreck unloading points, receive the wreck track wreck from each wreck assembly -kyradalta.

15

For the purposes of this application, a papermaking machine or the like means a paper, board, tissue or pulp drying machine.

Generally, at the wet end of a papermaking machine, the wreck is discharged at several points of the wreck discharge e.g. in the wire section, i.e. the web forming section in the edge strip cutting, in the case of web breaks in the pressing section and at the beginning of the drying section, in open openings of the papermaking machine between the various sections and generally when the web is unreadable from below.

In known wreck systems, the principle is that the wreck in the pulper below the paper machine is mixed with water so that the consistency of the resulting stock is typically about 3%. The stock is then pumped into a wrecking tower, from where it is taken back to the paper machine, either as part of the pulp or, in extreme situations, using only wreckage.

30 2

Typically, the wreck is pulverized in the powders below the machine to a consistency that is pumped at the machine's production rate, which is usually between 4% and 5%. The disintegrated stock is usually pumped through the pulper of the wire section to the wreckage and the peripheral wreckage of the wire section is continuously pumped through the wreck thickener to the wrecker 5 or into the thickener. The coated wreck containing the ash from the coating, the amount of which is to be adjusted in the paper, is kept separate from the bottom paper wreck and stored on the wrecked tom of the coated paper. The wreck is sorted eg. due to poor degradation of the coated wreck. Sorting can be done on any wreck, whereby the uncoated and coated wreck is proportional to the amount of ash coming from the wreck to the bottom 10 first to the wreck dosing tank, from where they are pumped through the pulp dosing. Prior to dispensing to the papermaking machine, the wreck is thickened with a gravity thickener, which may be in the bottom line of the bottom shelf or as its own thickener in connection with the wreck tower. The wreck is usually dosed to a paper machine at 5-20% of the machine's output. When wrecking atoms are run 15 empty, for example prior to shutdown, the dosing can be up to 50-60% of machine output from time to time.

An essential problem with known wreck systems is that the use of the wreck cannot be scheduled at the best time of production. In addition, large wreckage atoms, large volume of water in their wreckage systems and time delays affecting production are also problematic. In connection with the problems, it can also be noted that since the wreck produced by the wet and dry ends of the paper machine is the result of problems with the pulp properties or chemistry, it would be most advantageous to run the paper machine with fresh pulps. However, this is not possible if the wreck cannot be recovered. In addition to driving problems, preparing for the wreck increases the investment, as storage tanks and dilution water tanks have to be built to preserve the wreck. In addition, the pulp does not remain in the tank consistency for extended periods and, on the other hand, the tanks must be emptied as quickly as possible in order to maintain readiness for handling the next break, 30 3

It is a primary object of the present invention to provide a novel wreck system, particularly for the wet end of a papermaking machine, which would eliminate or at least substantially reduce the above-mentioned problems and disadvantages associated with conventional wreck systems. In particular, the object of the present invention 5 is to reduce the mixing of the wreck with water. According to a further aspect of the present invention, the object is to eliminate the need to use a pulper and to provide a pre-treatment for the wreck to direct all machine wreckage wreckage to a constant consistency and subsequently decompose and dilute to a pumped consistency in the wreck tower.

10

The wreck system according to the invention is characterized in that the intermediate conveyor and / or each conveyor means included in each collecting means is provided with means for mixing the dilution water with the wreck to such an extent that the wreckage dilutes between 6-20%, preferably 10-15%. unloads the diluted debris mass into the debris tomato.

According to a preferred embodiment of the invention, the wreckage web extends at least to the wet end of the paper machine and discharges the wreck either directly or via an intermediate conveyor to the wreckage. For the purpose of the invention, the seal tomato may be placed freely, however, it is preferred that it be placed near the paper machine.

It is further advantageous for the preferred embodiment of the invention that the first wreck assembly means is disposed below the end of the forming section of the web, and that the second assembly means is arranged at least below the press section. In this case, it is preferable that each assembly means comprise at least one conveyor means for transferring the wreckage from the wreck unloading site below and in the center of the paper machine or on one or both sides of the machine.

To achieve a substantially uniform consistency, regardless of where the wreck is discharged, it is inherent in the invention that dilution water is mixed with the wreck in the intermediate conveyor and / or in each conveyor means of each assembly means such that the wreck has a consistency of 6-20%, more preferably 10-15%. where the consistency of the wreck track or intermediate conveyor discharges the diluted wreck mass to the wreck tower. According to the invention, the dilution water is then drawn from the first dilution water tube.

5

In order to stabilize the consistency in the wreck tower between 6-20%, more preferably between 10-15%, the dilution water can also be fed directly to the wreck tower according to the invention.

According to an embodiment of the preferred embodiment of the invention, it is preferable that the conveyor means for laterally moving the wreck with the stacking means below and in the middle or on both sides of the paper machine or the like is two-fold such that obliquely transversely. In this case, the conveyor means discharges the debris through the opposite ends of the debris web in the center of the paper machine or the like, or through the offset ends to the debris web on the sides of the paper machine or the like.

According to another embodiment of the preferred embodiment of the invention, the conveyor means for laterally moving the wreck with the stacking means on the side of the papermaking machine is one-piece such that its center line parallel to the transfer direction of the wreck runs at right angles or obliquely.

25

According to the invention, it is preferred that the wreck track, which is a belt conveyor or the like, introduces the wreck mass into the intermediate conveyor which is diluting the wreckage. For the same purpose, i. It is also advantageous for the conveyor means of the conveying means to be screw conveyors for mixing the dilution water and the pulp and achieving the desired consistency.

It is further advantageous for the invention, in particular to ensure collection of the wreck from the wreck unloading point 5 and to facilitate post-treatment, that each assembly means includes mechanical wreck disintegrating means arranged prior to the conveyor means included in the assembly means and a receiving receptacle or container an edge portion and a funnel-shaped and / or inclined sliding 10 base portion inclined towards the mechanical wreck dismantling means with an outlet through which the wreck drops into the conveying means of the wreck assembly. According to one embodiment, the mechanical wreck disintegrating means consists of a pair of wrecking or tearing rolls, the roller axes being at right angles or obliquely to the MD direction, and wherein at least one outer roller surface is wrecking or tearing to reduce the wreckage. According to another embodiment of the invention, the mechanical wreck disintegrating means consist of water jets.

According to the invention, the amount of dilution water supplied to the conveyor conveyor or conveyor is determined in order to obtain a wreck mass of the desired consistency, which is fed to the wreck track or spacer jet, and thus controlled by the wreck position and width information.

Among the advantages of the invention, it can be mentioned that the wreck generated in the paper machine can be used exactly when it is reasonable for the runnability of the paper machine and / or the paper quality, and that the wrecker included in the wreck system of the invention simplifies and accelerates handling. Driving problems can be solved quicker by using fresh pulp, whereby the efficiency of the paper machine is substantially improved. The wreck system according to the invention can, if desired, accommodate in a low basement space without the need for large wreck towers on a paper machine, whereby the investment is 6 and the wreck system is substantially more compact than conventional wreck systems. In addition, the wreck system of the invention is faster and more accurate due to lower mass contents and continuous operation. The invention also opens up the possibility of using the resulting discard as a raw material on another paper machine or the like.

The invention will now be explained in more detail by means of a preferred embodiment thereof, with reference to the accompanying drawings, in which FIG. 1 schematically illustrates a wreck system for treating a wreck at a wet end of a papermaking machine according to the invention, FIG. 2 schematically illustrates a preferred embodiment of a wreck system assembly means, and FIG. 3 schematically illustrates another preferred embodiment of a wreck system assembly means.

15

Referring to Figure 1, which illustrates a wreck system according to the invention at the wet end of a paper machine for receiving wreckage from wreck discharge sites and for transporting wreckage to wreckage 6.

For the sake of clarity, several different wreck discharge points are represented in Fig. 1 by the wreck discharge point between the web forming or wire part WS and the first press unit PS1 of the press part; and a wreck discharge point between the first press unit PS1 and the second press unit PS2 of the press section or the wreck discharge point between the first press unit PS1 of the press section and the drying section DS 25.

More generally, wreckage occurs, for example, as a result of edge strip cutting, web break, every open export, any part of the paper machine where the web R is unsupported, and in each intermediate zone between different parts of the paper machine such as em between the first compression unit PS1 of the compression part, between the compression units PS1, PS2 of the compression part or between the first compression unit PS1 of the compression part and the drying part DS.

In the embodiment of Figure 1, the wreck system of the invention is provided below the papermaking machine in connection with the beginning of the web forming section WS, the first pressing section PS1 of the subsequent pressing section and the second pressing unit PS2 or drying section DS. In a typical paper machine, the dry solids content of the web after the web forming part is usually <20%, typically between 10-20%. It is common for papermaking machines to have a jet drop jet in the forming part of the web with a consistency of about 10%. After the press section, the dry matter content is usually <60%, typically between 40 and 55%.

The wreck system according to the invention includes first wreck assembly means 1 disposed below the end of the web forming member WS and second assembly means 2 arranged below the press member PS1, PS2. According to the invention, the collecting means 1, 2 dismantle the debris on the debris web 3 which extends substantially to the wet end of the paper machine WS, PS1, PS2 / DS. The wrecking track 3 in turn discharges the wreck further downstream of the wrecking track 3 to the wrecking conveyor 4. The intermediate conveyor 4 is mixed with dilution water from the first dilution-20 water pipe 5, then led to a desired consistency of 6-20%, more preferably 10-15% In order to stabilize the consistency to a consistency of between 6 and 20%, more preferably between 10 and 15%, in the wreckage 6, the dilution water according to the invention can also be led directly to the wreckage tower.

25

In the rejection mass 6, the rejection mass is broken down and diluted in the lower part 9 of the rejection atom 6 to a consistency which is typically pumped with dilution water fed through a second dilution water pipe 7, typically about 4-5%. In order to eliminate the need for pulper, the rejection mass to be pumped out of the outlet tube 9 of the lower portion 6 is further diluted 30 through the third dilution water tube 8 to provide a stock consistency of about 3%.

8

The dilution water suitable for the first, second and third dilution water pipes 5, 7 and 8 is preferably obtained from filtrate-free water.

The first wreck size means 1 extend in the advancing or MD direction of the web below the forming member WS and in the CD direction transverse to the width of the paper machine. Similarly, the second wreck assembly means 2 extends backwardly under the clamping portion PS1, PS2 in the MD direction and in the CD direction transverse to the MD machine width.

10

Preferably, the assembly means 1, 2 each include at least one conveyor means, such as a belt conveyor or the like, which allows for the receipt of a track-width wreck on a paper machine and for post-treatment of the wreck in the wreck system. Alternatively, the assembly means 1, 2 may each include a single screw conveyor or the like, which allows for the receipt of a track-width wreck on a paper machine and for the transfer of the wreck for post-treatment in the wreck system of the invention,

According to the invention, the aim is to move the wreckage from the dismantling point of the wreck with the assembly means 1, 2 below and in the middle of the paper machine or, if there is room in the machine hall, to both sides of the machine or only one side.

For transverse displacement of the wreck either in the center of the machine or on both sides, the conveyor means 11 of the assembling means 1,2 is such that the center lines of the conveying means 11 of the conveyor means 11 extend at right angles or obliquely to the MD. through the ends to the wrecking track 3 in the center of the machine or through the ends spaced apart to the wrecking tracks 3 on the sides of the machine.

30 9

For transverse displacement of the wreck, only one side of the paper machine conveyor means 1, 2 may be integral with its center line perpendicular to the MD direction perpendicular to the MD direction or obliquely transverse to the paper machine web. may be assembled underneath the paper machine, preferably in the center of the paper machine, or if there is sufficient space in the paper machine hall, to one side or both sides of the paper machine and transferred by stacking means to a wreck web 3 preferably formed by a belt, tray or similar conveyor. The sealing track 3 and its displacement direction preferably extend at least from the end of the press section PS1, PS2 or the beginning of the drying section DS in a direction opposite to the MD direction past the beginning of the papermaking section WS.

At the end of the wreckage track 3, the wreck can be guided directly to the wreckage storehouse 6 below the end of the wreckage track. However, to implement the basic principle of the invention, the end of the wreckage track 3 extends above the wreckage conveyor 4.

Since the basic principle of the invention is to store the debris from the various parts of the papermaking machine in a disintegrating stock 6, in a uniform dry solids content, according to a preferred embodiment of the invention, the conveyor 4 , whereby the consistency of the pulp, i.e. the dry matter content, can be diluted between 6 and 20%, more preferably between 10 and 15%. To facilitate the mixing of the water, the wreck intermediate conveyor 4 is, for example, a screw conveyor for mixing the bulk material. According to another preferred embodiment of the invention, the dilution water can be introduced directly to the wreck tower 6 to stabilize the wreck tower to between 6-20%, preferably between 30 and 15%.

10

Because in a paper machine process or the like, substantially all of the fiber suspension is fed into the process via a headbox; since it is known in advance that the evolution of the dry solids content of the web in the process, for spatial information; since, on the other hand, an edge band-type wreck occurs only at a precisely predetermined 5 locations, i.e.. latitude and / or latitude; and since as a result of a continuous web orbit the wreckage of the webs of the web can occur only in one place, i.e.. latitude and / or location, the dry matter content of the wreck is known to be a problem. Thus, the amount of dilution water input can be quickly and accurately determined to the desired consistency, i.e.. 6 to 20%, more preferably 10 to 15%, to produce a diluted debris mass 10 in conveyor means 11, 2 or conveyor 4 of assembly means 1, 2, whereby dilute debris diluted to the desired consistency can be fed to the debris tomato 6.

Referring to Figure 2, to aid in the handling of the wreckage, it is desirable to provide the stacking means 1, 2 also with mechanical wreck disintegrating means 12. The disintegrating means are preferably located before the conveyor means 11 included in the forming means 1, 2.

The mechanical wreck disintegrating means 12 preferably consists of a pair of wrecking or tearing rolls, the roller shafts being at right angles or obliquely to the MD direction, and wherein at least one outer roller surface is wrecking or tearing to reduce the wreck preferably to flake-like shredding. To ensure recovery of all wreckage from the wreck discharge site, it is preferred that the wreck assembly means 1, 2 also include a wreck receiving vessel 13 which is open at the top comprising a continuous peripheral portion 14 and a funnel and / or 25 inclined sliding bottom portion 15 16, through which the wreck drops onto the transport means 11 of the wreck assembly means 1, 2.

Naturally, the shredding or shredding pair of rollers of Figure 2 may be replaced by another equivalent yielding device. Figure 3 illustrates one such embodiment. In order to disintegrate the wreck, water jets 12 'are shown within the pair of rollers which cut and disintegrate the web with its flow. The advantage of such an embodiment is that the amount of water used to tear the web together with the conveying means 11, which preferably consists of a screw conveyor, can be adjusted so that it is no longer necessary to supply the dilution water 5 or to arrange an intermediate conveyor 4 6.

The invention has been described above by way of example only in some preferred embodiments and embodiments thereof. This, of course, is not intended to limit the invention in any way, but as will be apparent to one skilled in the art, many alternative solutions and variations are possible within the scope of the inventive idea and the scope of the appended claims.

Claims (13)

A wetting arrangement for the hydrogen end of a paper machine or equivalent, in which the dry matter content of the web is <60% and comprises at least one web forming portion (WS) and a pressing portion (PS1, PS2) and advantageously a portion of a drying portion (DS), which projecting arrangements are arranged between a dispensing point for projections and a projecting frame and comprising arranged under the paper machine or equivalent (WP, PS1, PS2, DS) at least one collection means (1, 2) for receiving projections from the places for dispensing, a projection path 10 (3) for receiving projections from each and a means (1, 2) for collecting projections and for transporting projections past the web forming portion (WP) to the front end of the paper machine or the corresponding and a projecting body (6) for receiving of commutes transported by the projection path (3) either directly or via an intermediate conveyor (4) from the projection path (3), characterized in that the intermediate conveyor (4) and / or a transport means (11) belonging to each of a collection means (1,2) is provided with means for mixing dilution water in the project to the extent that the thickness of the project is diluted to between 6 and 20%, advantageously between and 15%, at which the thickness of the projecting web (3) or the intermediate conveyor (4) discharges the diluted projecting mass into the projecting tower (6). 20 The projection arrangement according to claim 1, characterized in that the projection path (3) extends substantially over the length of the liquid end of the paper machine (WP, PS1, PS2, DS), and that the projection path (3) discharges the projection either directly or via the intermediate conveyor (4). to the projecting tower (6). 25 The projection arrangement according to claim 1 or 2, characterized in that the first means (1) for collecting projections are arranged below the end of the web forming portion (WS) and the second collecting means (2) are arranged below the press portion (PS 1, PS2). ). 30 The projection arrangement according to claim 3, characterized in that each and every collection means (1,2) comprises at least one transport means (11) for transporting from the place of dispensing of the projections under the paper machine to the center or to one or the other. both sides of the machine. 5 The projection arrangement according to any of claims 1-4, characterized in that dilution water is measured directly to the projection body (6) to make the thickness colisti in the projection body. Leaching device according to any one of claims 1-4, characterized in that the dilution water is led to the transport means (11) in the collecting means (1, 2) or to the intermediate conveyor (4) from a first dilution water pipe (5). A projection arrangement according to any one of claims 1-6, characterized in that for transporting the projections in the lateral direction with the collecting means (1, 2) from the place of dispensing of projections below and to the center of the paper machine or corresponding or to both sides the conveying means (11) belonging to the collecting means two-parted in such a way that the central lines parallel to the transport direction of the projection extend at right angles or obliquely with respect to the MD-direction, which means transport out projections via the facing each other or the opposite ends of the projecting web (3), which is at the center of the paper machine or equivalent or which are correspondingly located at the sides of the paper machine or the like. A projection arrangement according to any one of claims 1-6, characterized in that for transporting the projection in the lateral direction with the collecting means (1,2) from the place of dispensing of projections to the side of the paper machine or correspondingly, the transport means (11) belonging to the collecting means have a part in such a way that its centerline parallel to the direction of transport of the project extends at right angles or obliquely transversely with respect to the MD direction. The projection arrangement according to any one of claims 1-8, characterized in that it stores storage masses having different thicknesses at the places for dispensing of projections having a substantially uniform thickness in the projecting tower (6) which transports the projecting path (3). is a belt conveyor or equivalent, the projecting masses 5 to the intermediate conveyor (4), which, to promote mixing of the dilution water, is a screw conveyor which mixes the projecting mass and the dilution water. Projection arrangement according to any of claims 1-9, characterized in that each collection means (1, 2) comprises mechanical means (12, 12 ') for disintegrating projections which are arranged before the conveying means belonging to the collecting means. (11), and a receptacle (13) for receiving projections, which is open at the top and comprises a continuous edge portion (14) and a funnel-shaped and / or against the mechanical means (12, 12 ') for disintegrating projections a sliding bottom portion (15) having an exit (16) through which the projection 15 descends on the transport means belonging to the projection means. A projection arrangement according to claim 10, characterized in that the mechanical means (12) for the disintegration of the project consists of a pair of rollers which hack or tear the project, in which a pair of the roller shafts are at right angles or oblique in relation to the MD. direction and in which the outer surface of the at least one roller is one which cuts or tears the project for atomizing the project advantageously to flake chopping. A projection arrangement according to claim 10, characterized in that the mechanical means (12 ') for disintegrating projections consist of water jets which disintegrate the projections. Projection arrangement according to any of claims 1-12, characterized in that the amount of dilution water supplied to the conveying means (11) in the collecting means (1,2) or to the intermediate conveyor (4) is based on the position and width data of the committee. at the place of discharge of the committee.