JPS6059191A - Legless drum filter for paper pulp - 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 The present invention relates to improvements in regress type drum filters for paper/solp applications.

The conventionally used drum filter of this building has the configuration shown in Figure 1.
The top of the partition l between the drum pad 3 and the drum l
Mizuko line 0.L passing through the center of
Therefore, the level of the processing liquid that overflowed this partition ≠ and flowed into the drum pad 3 is 0.000000000000,000 on the horizontal line passing through the center of the drum 1, as shown in FIG. The angle is θ1 with respect to L. The reason for this is, as shown in Figure 3B, the angle θ between the tangential line and the horizontal line at the point of contact with the treated liquid water surface of the drum L.
(Degree of immersion) When the degree of immersion is less than O0, the separation between the liquid level and the pulp 11 goes smoothly, and when this angle θ exceeds 20° (Fig. 3 A), it is affected by fluctuations in the liquid level. However, it is currently not used because it has a major drawback in that it does not adhere uniformly to the drum.

The present inventors have succeeded in developing the present invention as a result of various research experiments aimed at improving the processing capacity of conventional methods of this type. However, a detailed explanation will be given based on FIG. 2 showing a specific example of the present invention.

In the drum filter of the present invention, a partition plate j is provided at the top of the partition part g, and the top of the partition plate j is aligned with the drum center horizontal plane 0. L, positioned higher up. Incidentally, the partition plate j may have a variable adjustment mechanism so that its effectiveness can be adjusted as required. Adjustment of the height of the partition plate is made depending on the nature of the pulp material being treated and changes in the inlet concentration.

By adopting the above configuration, you can create a partition plate! Table 1 shows the change in processing capacity as the immersion degree changed by 0°C.

Table 1 As is clear from Table 1, it is clear that when the degree of immersion θ° exceeds lzaOo, the treatment gap is improved by 2θ% or more.

By adopting the configuration of the present invention, the water flow head difference (ΔH) of the processing liquid from the supply axis λ to the drum notch 3 can be reduced.
When the treatment liquid was gradually changed, the results of the occurrence of the Western species as shown in the table were obtained. The fibers St in the fibers, kl, and nolp solution aggregate to form a plate-like or lump-like shape, which obstructs filtration.

Table 2 (Phenomenon of Western species generation) In Table 2: ×... Western species are generated. Q... Western species are not generated. By setting the water flow head (ΔH) to 20 wM or more, it is possible to suppress the generation of foreign species, achieve sufficient mixing of the Noronurso solution, promote adsorption of the processing solution to the drum surface, and improve processing capacity. 'Two can be done.

As is clear from the above description, by using the $f# configuration of the present invention, the following functions and effects are mainly achieved.

(In order to make the immersion angle θ0 of the re-drum more than 1100, the processing capacity can be greatly improved.

(g) By providing the treated pulp liquid with a water flow difference greater than or equal to 0, it was possible to prevent the generation of grains and improve the processing capacity.

(3) Improved processing capacity made it possible to reduce the size of the filter itself, that is, to reduce the filter area.

(Along with the miniaturization mentioned in item (3) above, power is reduced, and both equipment costs and operating costs are lowered, leading to cost reductions.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a conventional drum filter, FIG. 2 is a schematic sectional view of the drum filter of the present invention, and FIGS. 3A and 3B are schematic views illustrating the contact points between the treatment liquid water surface and the drum.
l is the drum, C is the processing liquid supply number, 3 is the drum knot, ≠ is the partition, j is the partition plate, O, L are the drum center level, and ΔH is the processing liquid water flow head. Third garden A

Claims (2)

[Claims] (1) In a drum filter, a partition plate is provided at the upper part of the partition between the processing liquid supplying thorn rhamnosets, and the top of the partition plate is located above the horizontal plane of the drum center. Legless type tram filter. (2) The legless drum filter for paper pulp according to claim 1, further comprising a variable height adjustment mechanism for the partition plate.