JPH02175985A - Washing shower for filter - Google Patents

Abstract

PURPOSE:To enable uniform supply of washing water in a rectified state in the width direction of a drum by providing water supply heads for supplying the washing water to a pulp sheet on the surface of a drum filter with a special structure. CONSTITUTION:Water supply heads 8 for supplying washing water to a pulp sheet 11 on the surface of a drum filter having a drum 9 and a wire net 10 are constructed by arranging a long cylindrical unit 1 for each head 8 in the width direction of the drum 9 opposite the surface of the drum 9, forming a long slit 5 in the drum width direction in part of each cylindrical unit 1 opposite the drum, providing a trough 2 on the lower edge of the slit 5 and protrusively installing many guide plates 3 on the top surface of the trough 2 directing to the drum 9. Regulating plates 4 for regulating the slit width are preferably provided between the respective guide plates 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cleaning shower for a drum filter in a pulp manufacturing process.

[Prior art] Conventional cleaning showers for drum filters have a nozzle tip with a hole of a few nanometers or a few nanometers at the tip, and a plate for spreading the cleaning water in a fan shape, or a plate for spreading the cleaning water in a fan shape. A large number of nozzles with fan-shaped holes were lined up in the width direction of the herator, and the nozzles sprayed cleaning water onto the pulp sheet.

[Problems to be Solved by the Invention] Conventional nozzles generally spread the jet of cleaning water into a fan shape for the purpose of uniformly distributing the cleaning water in the width direction.

However, it is difficult to spray the product evenly in the width direction, so it is rare that only one nozzle is used for cleaning.
The cleaning water is often divided into several bottles and used. As a result, the cleaning water is distributed and supplied in small amounts, and is further sprayed in a fan shape, which increases the amount of contact with air and entrains the cleaning water with air bubbles. It is then fed onto a pulp sheet.

It is a well-known fact that cleaning efficiency deteriorates when air bubbles are entrained in the cleaning water, and that foaming of the furnace liquid impairs cleaning in the subsequent filter.

It is also a well-known fact that the cleaning efficiency decreases when the temperature of the cleaning water decreases due to the increased contact between the cleaning water and the air.

The present invention aims to solve these problems of conventional cleaning shower nozzles.

[Means for Solving the Problem] A slit 5 is provided in the longitudinal direction of the header 1, a gutter 2 is joined to the opening of the slit 5, and a partition is created to partition the gutter chain 2 and the slit portion 5 into 5 to 30 cr* in the width direction. This is a filter cleaning shower characterized by being provided with a plate 3.

[Function] In the cleaning shower using this cleaning shower, the cleaning water flows out of the gutter 2 in a rectified state, and after being pooled at the tip of the gutter,
It quickly permeates and absorbs into the pulp sheet.

Therefore, like a cleaning shower using a conventional nozzle,
It does not entrain air and create bubbles, nor does it disturb the surface of the pulp sheet.

Furthermore, even if there is uneven cleaning in the width direction, it can be adjusted as desired and uniform cleaning can be achieved.

[Example] Embodiments of the invention will be described based on the drawings.

The first country is a perspective view of a cleaning shower according to the present invention.

A slit 5 is provided in the header 1, and a gutter 2 partitioned by a partition plate 3 is connected to the slit part.

A regulating plate 4 for adjusting the flow rate of washing water is attached to the opening of the slit in each part partitioned by each partition plate 3. Adjustment plate 4
is attached to the header 1 with fixing fittings 6. The header 1 is made of a gas pipe or a stainless steel pipe for piping, but may also be a square steel pipe.

The larger the pipe diameter, the more uniform the flow rate of cleaning water in the width direction.
There are problems with weight and economy. The diameter should be selected according to the amount of washing water and drum washer surface length, but a diameter of several inches will usually suffice.

If you want to achieve even more uniformity, you can install a partition plate inside this tube or insert a pipe with many holes to make it a double tube.

Reference numeral 2 denotes a gutter that supplies the washing water distributed by the helter to the pulp sheet 11 in a rectified state without being stirred by air.

It is also possible to attach a lip 7 as described later to the tip of this gutter 2.

The partition plate 3 not only reinforces the gutter 2 but also serves as a partition for the flow rate adjustment plate 4 that adjusts the flow rate for each partition.

A fixing metal fitting 6 is attached to the flow rate adjusting plate 4 and the fitting 6 which can be slid along the circumferential direction of the tube 1.

It is desirable that the gutter 2 is horizontal, but if horizontal machining is difficult, the lower part of the gutter 2 should be shaped into a corrugated shape as shown in Figure 4 to prevent the washing water from being supplied unevenly even if there is a slight slope. It is also effective to do so.

FIG. 2 shows the installation of the cleaning shower 8 of the present invention, and this device can be installed anywhere within the range of conventional nozzle installation positions.

The length of the gutter 2 in the width direction is determined by the surface length of the washer drum. Usually, it is preferable to make it the suction width of the drum 9 or several centimeters narrower than that.

The smaller the distance between the tip of the gutter 2 and the pulp sheet 11, the smaller the amount of cleaning water that falls into the vat from between the tip of the gutter 2 and the pulp sheet 11, which is convenient.
If the thickness of the pulp sheet 11 fluctuates, there is a risk that the pulp sheet 11 will hit the tip of the ta2 and damage the wire mesh 10 stretched over the surface of the drum 9, so it is best to set the thickness of the pulp sheet 11 to about 1 cm. If there is a large fluctuation in the amount of water, it is advisable to attach a lip 7 of several centimeters wide to the tip of the gutter 2 using a flexible sheet such as rubber or Teflon, as shown in FIG.

The distance between the tip of the gutter 2 and the pulp sheet 11 is determined by screws attached to both ends of the shower.
It is also possible to install hydraulic or pneumatic cylinders.

The cleaning shower 8 is installed as horizontally and parallel to the surface of the drum 9 as possible, and is set so that the distance between the surface of the pulp sheet 11 and the tip of the gutter 2 is about 1 cm, and cleaning water is supplied.

The angle between the gutter 2 and the surface of the drum 9 is not fixed, and can be adjusted so that the cleaning water permeates the surface of the pulp sheet 11 without disturbing it.
If the washing water is tilted, the washing water may not flow out uniformly, but in that case, adjust it by sliding the adjustment plate 4.

Depending on the drum 9, the thickness of the pulp sheet 11 may differ depending on the position, but in that case, the thickness of the pulp sheet 11 may differ depending on the position.
Adjust so that more water flows through the thicker parts and less water flows through the thinner parts. If a large amount of cleaning water needs to be supplied and the pulp sheet 11 is likely to run down, two or more cleaning showers 8 may be installed to supply the water in a distributed manner.

[Effects of the invention] When this cleaning shower is used in a filter for cleaning unbleached pulp, there is no air entrainment like in the past, and the foaming of the fi liquid is reduced. Even if it is stopped or reduced, the cleaning effect will not decrease.

The cleanliness of the bleached filter also improves and the amount of bleaching chemicals can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the filter cleaning shower of the present invention, Fig. 2 is a side view showing the mounting position of the shower, and Fig. 3 is a perspective view showing the lip attached to the gutter. FIG. 4 is a perspective view showing another embodiment of the gutter. 1... Header 2... Gutter, 3... Partition plate, 4... Flow rate adjustment plate, 5...
Slit, 6...Mounting bracket, 7...Lip,
8...Cleaning shower 9...Drum, 1
0... Wire mesh, 11... Pulp sheet 1f Figure 3 Figure 2 Figure 4rM

Claims (2)

[Claims] (1) In the shower that supplies washing water for the drum filter for pulp washing onto the pulp sheet, a slit 5 is provided in the longitudinal direction of the header 1, and a gutter 2 is provided at one end of the slit.
and connect the gutter and the slit part with a width of 5cm to 30cm.
A cleaning shower for a filter, characterized in that a partition plate 3 is provided to partition the shower. (2) The filter cleaning shower according to claim 1, further comprising a partition plate 4 for adjusting the flow rate of cleaning water between each partition plate 3.