JPS5815520Y2 - Digester - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a digester used for pulping chips and the like.

For example, pulping treatment for C-TMP (chemi-thermomechanical pulp) and C-RMP (chemi-refiner mechanical pulp) consists of a chemical treatment in the first half and a refining treatment in the latter half.

In other words, the yield of C-TMP, C-RMP, etc. is 90%.
In the high-yield pulp manufacturing process, which reaches around 10%, it is required that the chemical treatment in the first half be carried out slowly, and the refining treatment in the latter half be carried out at a high concentration.

The chemical treatment is called cooking and is carried out in a closed digester and in a refining beam finisher.

In Fig. 1, 1 is an inclined tube-shaped digester;
A screw feeder 2 is provided inside it, and
An input port 4 for raw materials (chips) 3 is formed at the bottom, and a discharge port 5 is formed at the top.

Further, a strainer 6 is provided at the bottom of the peripheral wall of the lower half of the cooker 1, and the chemical solution m is kept constant in the cooker 1 so that the bell l
is stored up to.

The chemical solution m is circulated through a tank 7 and a pump p, and is controlled to always be at a constant level l by a control pulp V interposed in the circulation line 8.

The raw material 3 is charged into the digester 1 through the input port 4, heated to a predetermined temperature by steam (2) supplied at the same time, and is cooked as the chemical solution (m) penetrates.

The raw material 3 is then fed upward through the digester 1 by the screw feeder 2 and dropped into the gas phase digester 9 through the outlet 5.

The raw material 3 that has undergone vapor phase cooking is then passed through the discharge screw 10.
The fibers are pushed into the disc rear inner 11 and defibrated.

The present invention provides, in the above-mentioned pulp manufacturing process,
We propose a cooking apparatus that can effectively perform chemical treatment and deliquification after treatment, thereby facilitating subsequent high-concentration refining and obtaining high-quality pulp. will be explained based on FIGS. 2 to 7.

2 and 3 show the first embodiment.

Reference numeral 12 denotes a raw material inputting chute, and a tapered press tube 13 is connected to this chute 12 with its axis horizontally, and a vertically extending push tube 14 is connected to the tip of the press tube 13. The lower end of the pipe 14 is connected to the input port 4 of the evaporation can 1 .

A horizontal screw feeder 15 is provided in the squeeze tube 13, and a pair of vertical screw feeders 16A and 16B are provided in the push tube 14.

17 is a cone valve provided opposite to the communication port 18 between the compressed pipe 13 and the forced pipe 14, and this cone valve 17 is always kept at a constant pressure in the direction in which the communication port 18 is to be closed by the cylinder device 19. is energized by

Note that the chemical liquid level l is controlled to be slightly lower than the communication port 18.

In the above, the raw material 3 introduced through the chute 12
While being transferred by the screw feeder 15, it is gradually compressed in cooperation with the compressing tube 13, and furthermore, it is compressed at this portion by the biasing force of the cone valve 17 at the communication port 18 portion, so that it becomes plug-shaped.

As the transfer of the raw material 3 continues, the transfer pressure becomes greater than the biasing force of the cone valve 17, and the raw material 3 that has been forming a plug moves back the cone valve 17 and is sequentially released into the push tube 14. be discharged.

The raw material 3 thus released and discharged is forced into the chemical solution m by a pair of screw feeders 16A and 16B.

At this time, since raw material 3 exhibits a sponge effect, chemical solution m
The drug solution m is immediately and effectively absorbed upon contact with the drug.

Therefore, a sufficient amount of the chemical solution m for chemical treatment penetrates into the raw material 3 in a short time, and liquid phase cooking can be completed in a short time.

The raw material 3 pushed into the digester 1 is transferred through the can 1 by the screw feeder 2, and is deliquified in the transfer path after the chemical solution m comes out.

Therefore, the deliquified raw material 3 is discharged from the discharge port 5 (see FIG. 1) of the evaporation can 1.

Therefore, the refiner 11 (see FIG. 1) can perform high-concentration refining.

Although the above description uses the twin vertical screw feeders 16A and 16B to push the raw material 3 into the chemical liquid can 1, various other pushing methods can be used.

FIGS. 4 to 7 illustrate a method of pushing in from the horizontal direction.

FIGS. 4 and 5 show a second embodiment.

Reference numeral 20 denotes a constricted push-in tube, the tip of which is inlet 21 facing the upper part of the starting end of the transfer path of the screw feeder 2 provided in the digester 1, and a cone valve 22 is provided to face the inlet 21. ing.

Reference numeral 23 denotes a cylinder device that urges the input port 22 with a constant pressure of the cone valve 22.

This cone valve 23 functions similarly to the cone valve 17 described in FIGS. 2 and 3.

The push tube 20 is provided horizontally in a direction perpendicular to the screw feeder 2, and a screw feeder 24 is provided concentrically therein.

According to the above, the raw material 3 that is sequentially fed by the screw feeder 24 is formed into a plug at the input port 21 by the shape of the push tube 20 being tapered and by compression by the biasing force of the cone valve 22. It is put into the cooking iron 1.

Therefore, after the raw material 3 is squeezed and put into the chemical solution m, it immediately absorbs the chemical solution m due to its sponge effect.

The subsequent steps are the same as those described above.

FIGS. 6 and 7 show a third embodiment.

In this embodiment, the screw feeders 25 arranged in the digester 1 are of a twin type consisting of a pair of mutually parallel screw feeders 25A and 25B, and each screw feeder 2
The blade portions of 5A and 25B are lapped together.

In addition, regarding the method of pushing the raw material 3, the shape of the pushing tube 26, the screw feeder 27 disposed in the pushing tube 26, the cone valve 28, and the cylinder device 29,
Since this is the same as the embodiment, the explanation will be omitted.

As for the screw feeders 25A and 25B, the helical directions of their blade portions are opposite as shown in the figure, and the rotation directions are also opposite.

In this way, the raw material 3 input from the input port 30 can be transferred while being crushed, so that the chemical solution can penetrate into the raw material 3 even better, in addition to the sponge effect of the raw material 3 itself. becomes.

It also exhibits a sufficient deliquification effect on the raw materials discharged from the chemical solution m.

The blade portions of the screw feeders 25A and 25B do not necessarily have to overlap each other or have a reverse helical direction.

In addition, in the first to third embodiments, the screw feeders 16A, 16B, and 24.27 are examples of pressing devices.

As explained above in the embodiments, according to the present invention, a squeezing and pushing device is provided, which includes a screw feeder for pushing the raw material into the inlet of the chemical liquid can and a cone valve for squeezing the pushed raw material with biasing force. Therefore, the raw material pushed in by the screw feeder can be compressed into a plug shape by the biasing force of the cone valve, thereby creating a large sponging effect on the raw material and allowing a sufficient amount of chemical solution to be applied to the raw material in a short time. can be penetrated.

Therefore, cooking can be carried out in a short time.

The present invention is applicable not only to pulping raw material chips but also to pulping non-wood raw materials such as bagasse.
Wear.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway schematic side view of the liquid phase digester, Fig. 2 is a vertical sectional side view of the main part of the first embodiment, and Fig. 3 is A-A in Fig. 2.
FIG. 4 is an enlarged view taken along arrows, FIG. 4 is a vertical sectional side view of the main part of the second embodiment, FIG. 5 is an enlarged view taken along the line B-B in FIG. , FIG. 7 is an enlarged view taken along the line CC in FIG. 6. 1... Cooking iron, 2... Screw feeder, 3... Raw material, 4, 21.30...
・Input port, 5... Outlet port, 13... Pressing pipe, 14, 20.26... Pushing pipe, 15.1
6 A, 16 B, 24゜27... Screw feeder for pushing, 17, 22゜28... Cone valve, m... Chemical solution.

Claims (1)

[Scope of utility model registration request] A tilted screw feeder is installed inside the slanted tube-shaped chemical line with an input port at the bottom and a discharge port at the top, and the screw feeder pushes the raw material into the input port of the chemical can and compresses the pushed raw material with a biasing force. A cooking device characterized by being equipped with a pressing device made of corn pulp.