JPS62501430A - Method and apparatus for continuously treating pipes with treatment liquid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Continuously fill the valve with treatment liquid The law and sophistication of □ The invention provides at least two rotatable webs of cellulosic material in a processing zone. Valves that supply and remove processing fluids from the web in successive processing stages. The present invention relates to a method for continuously treating rubs with a treatment liquid. The present invention also implements this method. Regarding equipment for The term "treatment" refers to valve cleaning, bleaching or some other Applies to chemical processing.

During the manufacture of valves, wood chips or other crushed cellulosic materials are Cooking is done by a bulging process that contains chemicals that dissolve some of the material. Then this By reducing the pressure on the material mechanically or with the equipment used for melting the material. defibrate. Before using the fibers thus produced, chemical and dissolving The material must be separated from the fibers, which is achieved by cleaning the valve. It will be done. Initially, this cleaning was performed using the same equipment used for deflating. Recently, the following A technology like this has been developed. That is, the valve is diluted with liquid and attached to a rotating filter. Once the web has formed, it is washed using the exclusion method. Then the web Dehydrate, dissolve and send to the next filter. The cleaning liquid flows countercurrently. chemicals Recovery required improved cleaning techniques, so the liquid had to be evaporated before combustion. There wasn't. Thus, each time water is added, this water must be removed by evaporation. Therefore, it is of paramount importance to recover chemicals with minimal dilution. It's here. Increasing energy and chemical costs will result in lower recovery and This increases the need for interpretation.

When cooking is carried out continuously, cleaning is preferably carried out at the bottom of the digester.

This cleaning is extremely efficient due to the high temperature and compressed fiber bed. Typically, the environment and For economic reasons, cleaning is required even after cleaning in the digester. Such cleaning can be done by e.g. For example, with a filter or other similar equipment, the web is It is formed from a dilute suspension produced by Dilution itself has no effect on cleaning results .

Additionally, the filter is an open unit and has associated problems.

Therefore, cleaning operations are carried out using what are known as continuous diffusion washers and pressure diffusers. In the process, a cleaning technique was developed to surround the valve.

In some cases, both presses, i.e. screw presses and roller presses, are cleaned Used in conjunction with process. Also, some roller presses are equipped with an exclusion zone, which allows the actual The removal is completed with a pressure nip. These presses are known as cleaning presses. It is. This type of cleaning device has a rotatable drum with perforated surrounding surface. If high dryness is desired at the end of the cleaning process or for some other reason, e.g. It is undoubtedly suitable before the oxygen gas phase. Examples of such devices are SE No. 31 No. 8182, No. 318183, No. 349340, No. 413685 and No. No. 434859.

゜ A special device for exchanging one type of liquid with another is listed in SR No. 157240. Are listed. The rejected liquid is transported by gravity between the different rejection zones and these The exclusion zones are at different heights in that the web transport path runs in steps. The web passes through multiple pools of liquid formed by rollers through which the wire passes.

The liquid is continuously forced through the web in the same direction, and before a later rejection stage. , no compression of the web is carried out to achieve a high degree of dryness.

The tiered structure of such devices is relatively long and therefore requires considerable space. . This book specifies how cleaning and υY can be applied to one horn or the other. When one nog is between two conveyors so that the direction (5 rows -), 2 and 1 are formed, j4S base says that it is possible to change the direction of processing and change the direction of processing. Below the conveyor, the liquid A body container is provided with a liquid boule which supplies liquid from above to the tube. After passing, the liquid is forced up from the liquid container through the web. proposed for this purpose. 4 Such devices extend horizontally and are therefore rather long. It is not possible to compress the web every time it is fed.

According to Finnish Patent No. 1 No. 834486, the wire runs at: m-y. It is known to clean valve fibers in a longitudinal tank, which Multiple chambers filled with "Haraning" placed in the ear and placed under the wire It is divided into a corresponding number of suction chambers. As the wire moves forward, the water The fibrous layer is suctioned through the wire to form a fibrous layer, and the fibrous layer is pink? whelk On the way to the roll, it is cleaned by the countercurrent principle, and the surrounding surface of the above-mentioned roll and the wire are cleaned. The water is compressed between the 8 washers and reaches the screw conveyor. Is the wire made in the same direction at the stage? Heavily supported and completely surrounded by liquid Compression of the washed web is not possible between each washing stage.

Recently, a wire cleaning machine using one wire (toe) and therefore generally known as a fourdrinier wire cleaner has been developed. New types of cleaning equipment have come into use.

With such a Fourdrinier wire cleaner, relatively thin '', 7, T, and tubercles are formed well. Made well. The web is then washed in countercurrent, with the liquid being transferred to the wire. Add and collect along flow path C1-. This equipment is relatively simple and easy to use. control and extremely efficient.

The main drawback about this technique is the wire and suction required to remove the water. Due to friction with the pull box, the wire undergoes considerable wear. Master the lifespan i - C'fiA. 1M expensive! i degree is 〒40- 7. I used it for 2 years (1, 2). Tomoichi 1"-ri and 2, replace this material 1 with other (::l 4..1) Experiments are currently underway. , -'s RT-type wire type washer is: 1 special type 1 part-10 No. 14.736, No. 4.046,621υ, No. 4.154.64L'; Permission I9.0 No. 7)) Corresponding to No. 112.85-1-), ・'+25f395, Tappi Jour nal) 6 G (7), 2 generations in 43rd to 45th breath.

Most of these known cleaners have a diameter of (11y).

The major advantages of Fourdrinier cleaning technology are: 1. and extremely good results with minimal bounds. Achieving cleaning results, you can do two things. Go, #1. i,i high energy 1st stroke is extremely important today in terms of increases.

The object of the present invention is to use the minimum amount of processing liquid that can be achieved with known Fourdrinier wire technology. ``ζEfficient?'', which further increases the possibility of two-way processing, also includes wires and suction bottles. Kusu 7 no 1? Removes the flaws of rubbing. Continuously process the two knobs with the processing solution 1) provides a novel 4c method;

The method of the present invention for processing Koyoro Velvet continuously at night is as follows: 47 people surrounded by the Bell River - Love, a song that runs downwards or upwards. Move along the winding path. In the second treatment stage, the blood on the first surface 31 is 1, and l: the belt moves around the first and 20-l. During the first treatment stage, the liquid is compressed between the belts. From said second surface, in a second treatment step, said liquid is removed from said first surface. Find a means to drain the liquid from the surrounding surface of the guide roller, or from the surrounding surface of the guide roller. the web towards the enclosing surface ζ of the guided roller Relatively high dryness is achieved by each liquid displacement compaction, and the liquid is removed by constant guide rollers. The liquid is removed immediately after or in the opposite direction to the flow direction of the liquid at the guide roller of Zugu II. It is characterized by occurring in the direction of flow through the web.

A device for carrying out this method is arranged so that the belt follows a tortuous path. Mouths in the form of l-ra are provided at different heights within the treatment area, and the spreading device In the first treatment zone, the liquid is applied to the web and on the surface of the web in the second treatment zone. a second surface thereof opposite the surface, and a bell l- and a guide rod. compression of the web enclosed between rollers or belts and removal of liquid from the web. They are characterized in that they are arranged to cooperate with each other in order to perform the operations.

A preferred embodiment of the apparatus according to the invention comprises a formation located in the IL (above the processing area). This formation directs the jet of fiber suspension before the belts approach each other. It has a head box arranged to feed one of the parts.

FIG. 1 is a schematic diagram of an apparatus according to a first embodiment of the present invention; FIG. 2 is a schematic diagram of a device according to a second embodiment of the present invention. FIG.

The apparatus shown in FIG. 1 comprises a forming area 1 and a processing area 2. The apparatus shown in FIG.

Two belts 3.4 pass through these parts to guide rollers and tension rollers. It runs in an endless loop over a plurality of rollers equipped with rollers 6, and each loop is formed Outer loop portion 7.8 and inner loop portion 9 for zone 1 and treatment zone 2 ．． I am drawing 10. The two outer loop parts 7.8 form the forming area 1 and the processing area spaced apart from each other, one on each side of the two. Inner loop part of the belt 9.1 0 run together in contact with each other in front of processing area 2 and at the end of processing area 2. They are arranged so that they run away from each other. ...ruto 3.4 is liquid Toru j1,5. Preferably, the belt is used for forming wire of the same type or of similar properties. Become. It can be seen that the belt is advanced at a speed of 1°.

In the illustrated embodiment, the forming I-shaped area l is of the k3j713 twirling type and - ＼If Nodopo Nox 11, suspension of cellulose-based substance Ia if ! ! 'Take the cloudy liquid 12, go to it'51ε 2 doors from the box 11. - i.e. a series νE of a predetermined thickness in the forming zone 13 by flowing onto the lower belt 3; Form the knob 14 in a downward direction. Immediately before the formation zone 13, the base Ruto 30 running direction 1i] is one of the above-mentioned rollers in the form of Shitost [11-ra 15]. can be changed by one. Below the belt 3, there are one or more suction boxes 6. A drainage device of the form is provided in the forming zone 13. The suction box draws the suspension; ・To suck it out from the 7th part through the belt 3, move 11 times under a vacuum for -)- minutes. word "Vacuum" as used herein means a pressure below atmospheric pressure.

In the illustrated embodiment, the processing area 2 includes four rotatable guides 10 on both belts 3. - fj' the ra 5a, 5b, 5C25d. These guy 1' rollers have different heights. The belts supported by and approaching each other have their inner loop portions 9.10. They are alternately displaced relative to each other in a winding path. The fruit shown In the embodiment, the guide rollers include two vertical rows spaced apart from each other by a predetermined distance. None provided.

Viewed in the running direction of the belt, the three guide rollers 5a, 5b, 5C of the processing zone 2 In front of each is a dispersion device 1 for the processing liquid to be supplied to the advancing web over its width. 7 is provided. Each spreading device 17 is connected to an associated guide roller 5a, 5b, 5C. They are spaced apart from each other, and behind each spraying device 17. Drain the liquid from the web. one or more suction pumps operating under a vacuum of A drainage device in the form of a draw box 18 is provided below the belt. Each one is the previous group. Two consecutive spreading devices located immediately after the idle rollers 5d, 5a, 5b, 5c Between 17 and 17 is the position where the belt is moving tangentially from the guide roller immediately in front of it. Start by supplying the processing liquid to the web, and after the web has been washed, the guide roller By compressing the web between the belts as it passes through the belts 5a, 5b, 5c, Then, the liquid is discharged from the sea urchin and 2 pumps at the guide rollers. A processing band is provided for each processing step. Thus, the flat fruit of the processing band The qualitatively horizontal 12-ear section can be defined as the fourdrinier wire section. I get it In this way, one belt 3 and the other belt 4 alternately provide support for the surrounding tube. Acts as a device and coating device. In the illustrated embodiment, the treatment area is a supplementary treatment area. This supplementary treatment area is equipped with an equivalent dispensing device 20 of the new treatment solution. and a drainage device in the form of one or more suction boxes 21. Guidero -ra5a.

The surrounding surfaces of 5b, 5c, 5d, i.e. the cylindrical walls, are solid, so that the liquid is displaced through the web in a direction away from the surrounding surface. Saw with guide roller The liquid from the displacement is collected in the lower receptacle 19 and the upstream treatment The top suction box 21 and the next two The liquid from the suction box 18 of carried to. Processing thus takes place on the principle of countercurrent flow, with fresh processing liquid flowing last. therefore, in this last processing step, the guide roller rotation is Do not perform further compression.

As the web and belt advance upwards, the processing liquid can be sent by gravity. The finished web 14 is collected in a trough 22 , a 2:3 screw, etc.

Before starting the first full treatment step with treatment liquid J] and compression, the The first guide in the area is compressed to C rather than O-ra 5D to compress this U-chotsubu to a relatively high dryness. It is 17 in this year. Liquid from this initial compression is transferred from the formation zone 1:3 and into the first Together with the liquid υ1 discharged from the cleaning zone, the liquid is collected in section 24, and then transferred to the tank. '125. Modification Example J. As soon as the web is formed, the first The processing Rk from the web is provided to the web at point 1) of the first guide v1-ra5d. 1. or<jl, then;-(a complete process substantially similar to the processing step) The logical stage (1) is carried out.

FIG. 2 shows another embodiment of the device according to the invention. In both examples, the same For similar elements and parts, the same reference is made; The apparatus comprises a forming zone l and a processing zone C'. 2 belts; 3.4 These run in the other) 2I direction, and the inside of the C belt ((11 loop part) Minute? , 1(] turns from the Tri part - the above except that it goes 8 downwards on the course In the same manner as in the example, run the loop r and H and follow the sections l and 2. .

Formation area 1. Jl: The head box 11 is positioned 1- from the processing area 2. 7, liquid box 30 J[a state n!l] ni device is guide loan 5c, 5", 5g, 5! Provided at 1ζ of the belt in each processing zone just before 1.51. The second roller has a solid surrounding surface. Processing liquid liquid box :30, and thus the processing liquid is passed through the web.

In the embodiment shown in FIG. 2, each treatment zone is also equipped with a treatment liquid spraying device: 31. The wetting device 831 is located immediately after each guide roller 7, and after the spreading device 31 there is a wetting device 7. a suction box to drain the fluid in the same flow direction as the guide roller immediately in front of it. A space 32 is provided. Liquid handling is based on the countercurrent principle, but in this case too, the liquid is The signal is sent to a higher level processing band by the amplifier 33.

As an example of a modification, supplementary treatment devices in the form of a spreading device 31 and a suction box 32 can be omitted. Therefore, the two vertical rows of guide rollers may be placed very close to each other, e.g. For example, they can be placed immediately adjacent or uniformly on a common vertical line.

Instead of supplying the processing liquid through the liquid box"30, the processing liquid is routed through the guide 11-l. A spray nozzle is inserted into each guide 11-ra to spray the nip between the It may be placed under the belt in front of the belt.

In a further embodiment (not shown) of the apparatus according to FIG. The liquid is supplied from above by means of a 41 device. In this case, the surrounding surface of the guide roller is Means are provided by which liquid can be drained at the surrounding surface. For example, The surrounding surface may be perforated or provided with channels, thus Bell Webb) l? f], the liquid is directed towards the surrounding surface of the roller. and pass it through the web. In this case, each guide roller is the same as the belt. jll running at the same speed (suitably to cooperate with the impermeable pressure strip at the end) This stub is arranged to prevent liquid from flowing out in the radial direction. The contact circle with the guide roller is arranged to press sealingly against the belt in the sector: ξ It will be done. Pressure strips are preferably applied to all guide rollers in vertical rows. It is common to all.

The device according to the invention, in a construction in which the treatment zones are arranged directly above or below each other, Its particular feature of washing cellulosic materials is to achieve consistently high dryness and At each point, the pH of each two treatment stages or the immediately following treatment stage should be changed in two directions, etc. , since liquid can be displaced with each compression in a highly effective manner. write The web is dehydrated by the belt tension while the web passes through the guide rollers. The pressure created by The long length of the previous design is significantly more expensive than that obtained with ear type washers. desired The compression of can be determined by the selection of the diameter of the Controlled by belt tension selection. Even if the direction of supply of processing liquid changes, By changing the direction of removal, the sea urchins are always on the same side of the belt. 7. Make sure you don't get pushed. Thus, the long wire cleaning device with conventional installation ■ Missing when the processing direction is the same throughout several processing stages) as in The closing of the knob to the bell I, which is a point, is prevented. The web side of each compression transfer Tondo QQ 4t? The side that has been drained is also the side that absorbs the freshly supplied processing liquid. High 6: As an effect of dryness, the cleaning result remains essentially the same even at greatly reduced dilution rates. Being treated like one another.

Each guide 11-ra constitutes a belt drive Mj location. , and Bell I. minimize the force acting on Most of the dehydration occurs at the guide rollers. In ten, it requires less suction box and therefore the need for horizontal space. Reduce. 17 However, because the processing bands are layered as shown in the diagram, Due to the ←'L'* or D arrangement, maximum floor space savings are achieved. mosquito The entire device can be easily assembled to enclose the entire device in a sealed manner. Wear.

Claims (1)

[Claims] 1. The web of cellulosic material runs together on rotatable rollers in the processing area. The processing liquid is transported in an enclosed manner between two belts that are The pulp is continuously treated with a treatment liquid that is fed to and removed from the web. In the method of Travel along the winding path (9, 10) that travels downwards or upwards on the epp (14). The treatment liquid is applied to the first surface of the wap (14) in the first treatment stage in the path. , a second surface of the web opposite the first surface in a second processing step, and the belt (3, 4) move around the first and second guide rollers (5). The liquid is removed in the first treatment stage by compressing the pump (14) between the belts (3, 4). from the second surface, and in a second treatment step, liquid is removed from the first surface; This liquid is discharged from the surrounding surface of the guide roller, which is solid, or the wep (14) towards the surrounding surface of the guide roller provided with the means; , the web (14) obtains a relatively high degree of dryness through each liquid expulsion compression, and a constant gas The liquid is removed by the idle roller at the guide roller (5) immediately after or immediately in front of it. characterized in that it occurs in the flow direction through the web (14) opposite to the flow direction of the liquid. how to. 2. said web (14) is formed in a forming area (1) before a processing area (2); Then, before the belts (3, 4) approach each other, a jet of the fiber suspension (12) is applied to the belts. a head box (11) arranged to feed on one side (3) of the A method according to claim 1, characterized in that: 3. The direction of movement of the belts (3, 4) after the guide roller (5) is the same as the direction of movement of the belts (3, 4) after the guide roller (5). opposite directions of movement, characterized in that these directions of movement are substantially parallel The method according to claim 1 or 2. 4. The web (14) is connected to a drainage device (1) in front of each guide roller (5) in the processing area. Claims 1, 2 or 8) characterized in that the liquid is initially drained through the is the method described in Section 3. 5. The processing is carried out using a processing liquid that is sent in a countercurrent to the direction of movement of the belt. The method according to any one of claims 1 to 4. 6. While passing through the guide rollers (5), the web (14) between the belts is compressed by the rollers. determined from the beginning by the selection of the belt diameter and during operation by the selection of the belt tension. According to any one of claims 1 to 5, the method is controlled by the method of. 7. Claims 1 to 6 for continuously treating pulp with a treatment liquid Apparatus for carrying out the method according to any one of the preceding claims, comprising a processing area and comprising two belts. Between these, a rotatable roller encircles the web and passes through the processing area. A sprayer is installed to supply processing liquid to the web. , in which the processing area has at least two continuous zones, the guide roller ( The rollers of the form 5) are processed so that the belts (3, 4) draw a meandering course. Spreading devices (17) are provided at different heights within the zone and distribute the treatment liquid in the first treatment zone. is applied to the web (14) on its first surface and in a second treatment zone with said first surface. The belts (3, 4) and the guide rollers are provided to feed the opposite second surface. The belt (5) is used to compress and compress the web (14) enclosed between the belts (3, 4). be arranged to cooperate with each other to effect the removal of liquid from the A device featuring: 8. It comprises a forming part (1) located upstream of the treatment zone, said forming part A jet of fiber suspension (12) is applied to one side of the belts (3, 4) before they approach each other. A head box (11) provided above (3) is provided. 8. The device according to claim 7, characterized in that: 9. The guide rollers (5) in the processing area are alternately displaced with respect to each other and the rollers (3, 4) run between the two guide rollers (5) in a substantially horizontal direction. Claim 7 or Apparatus according to paragraph 8. 10. The liquid drainage device (18) has belts (3, 4) running between two guide rollers (5). The belts (3, 4) are associated with regions of the belts (3, 4) running in a substantially horizontal direction. 9. Device according to claim 9, characterized in that it is provided under 4). 11. The belts (3, 4) are arranged to be moved in a winding path extending downwards. and the spreading device is located directly in front of each guide roller (5e-5i) in the processing area (2). A liquid bottle located under the belts (3, 4) across the width of these belts. (30), and the surface of the guide roller is solid. The device according to any one of items 7 to 9 of the scope of request. 12. A drainage device (32) allows the belts (3, 4) to pass between the two guide rollers (5). provided in connection with an area of the belt running in a substantially horizontal direction for dispersing the processing liquid; The device (31) has said drainage device ( 32) arranged immediately after the guide roller (5) so as to form a supplementary processing zone. 12. A device according to claim 11, characterized in that the device is located at: 13. The number of treatment zones equipped with guide rollers is between 3 and 5. The apparatus according to any one of claims 7 to 11, characterized in that: