JPH0448909A - Belt press roll draining device - 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] Industrial applications The present invention relates to a roll draining device for a belt press.

BACKGROUND OF THE INVENTION Conventionally, belt presses have been used for solid-liquid separation of various sludges and slurries. A belt press consists of multiple rolls and a pair of upper and lower bands (reticular filter cloth) stretched between the rolls.The sludge sandwiched between the bands is dehydrated by being pressed by the rolls and surface pressure, and the sludge is separated from the sludge. The separated desorbed liquid was discharged to the outside through a band. Then, in the final step, the bands are separated from each other, and the dehydrated cake is peeled off from the bands and discharged outside the machine.

Problems to be Solved by the Invention However, in the conventional configuration described above, the amount of desorbed liquid gradually decreases as dehydration progresses through a plurality of rolls.
It is included in the band. For this reason, in the roll where the dehydration process has proceeded, the desorbed liquid impregnated into the band cannot be drained off by its own weight, which has been a problem in reducing the water content of the dehydrated cake.

The present invention solves the above-mentioned problems, and aims to provide a roll draining device for a belt press that can drain the desorbed liquid that is pressed by the rolls and floats on the band.

Means for Solving the Problems In order to solve the above problems, the present invention provides two-ply belt-shaped filter cloths stretched between a plurality of rolls, and applies rut pressure and In a belt press that dewaters by pressing with surface pressure, a highly absorbent water-absorbing cloth is suspended so as to contact the filter cloth at the upper edge thereof, and is provided at a position where the filter cloth and the roll contact each other. It is something.

Function In the above configuration, the desorbed liquid that is separated from the sludge between the filter cloths under layer pressure and surface pressure by the rolls falls from the filter cloth due to its own weight at the beginning of the dewatering process, and is dehydrated after passing through a plurality of rolls. As it progresses, it gradually decreases to the extent that it is contained in the filter cloth. At this time, the desorbed liquid contained in the filter cloth is sucked by the water-absorbing cloth in contact with the filter cloth by capillary suction force. The desorbed liquid sucked from the upper edge of the water-absorbing cloth passes through the water-absorbing cloth, collects at the lower edge, and falls as droplets.

Therefore, the desorbed liquid that cannot be drained from the filter cloth due to gravity is collected by the water-absorbing cloth, and the water content of the dehydrated cake is reduced.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In Figures to Figure 2, a belt press 1 has a plurality of rolls 2.
A pair of upper and lower belt-shaped filter cloths 3 are provided endlessly between each roll 2. Moreover, a rotary mixer 6 is provided above the belt press 1 to mix the sludge 4 with a flocculant 5 and supply the mixture. Furthermore, the belt press 1 is formed with a compression dehydration zone A and a shear dehydration zone B. In the compression dehydration zone A, rutting pressure is applied by the roll 2, and in the shear dehydration zone B, the surface pressure and shear force are applied by the roll 2. It adds

A water-absorbing fabric 7 is supported by a fixing member 8 and suspended below the roll 2 located on the rear side of the process among the rolls 2 disposed in the shear dehydration zone B, and the water-absorbing fabric 7 is filtered at its upper edge. It is in contact with cloth 3. This water-absorbing cloth 7 is made of a highly water-absorbing cloth with a large capillary suction force, and is formed so that its lower edge is inclined toward one side.

The effects of the above configuration will be explained below.

The sludge 4 mixed with the flocculant 5 in the rotary mixer 6 is supplied between the filter cloths 3 of the belt press 1, and while the filter cloth 3 moves between the plurality of rolls 2, the rutting pressure by the rolls 2 and the surface Dehydrated under pressure.

The desorbed liquid 9, which is separated from the sludge 4 between the filter cloths 3 under the layer pressure and surface pressure by the rolls 2, falls from the filter cloth 3 due to its own weight in the early stage of the dewatering process, and is transferred to the plurality of rolls 2. As dehydration progresses, it gradually decreases to the extent that it is contained in the filter cloth 3.

At this time, the desorbed 1111E9 contained in the filter cloth 3 is removed from the filter cloth 3.
The water is sucked by capillary suction force to the water-absorbing cloth 7 that is in contact with the water absorbent cloth 7.

Then, the desorbed liquid 9 sucked from the upper edge of the water-absorbing cloth 7 passes through the water-absorbing cloth 7, collects at the lower edge, and falls as droplets from one side of the lower edge. Therefore, depending on the gravity, the filter cloth 3
The desorbed liquid 9 that cannot be drained is collected by the water-absorbing cloth 7, and the water content of the dehydrated cake sandwiched between the filter cloths 3 is reduced.

Effects of the Invention As described above, according to the present invention, by sucking the desorbed liquid contained in the filter cloth to the water-absorbing cloth in contact with the filter cloth using capillary suction force, the desorbed liquid that cannot be drained from the filter cloth due to gravity can be removed. The liquid can be collected to reduce the moisture content of the dehydrated cake.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of the X section in FIG. 1. 2...Roll, 3...Filter cloth, 7...Water absorbing cloth.

Claims (1)

[Claims] 1. In a belt press, a two-ply belt-shaped filter cloth is placed across a plurality of rolls, and the sludge sandwiched between the two-ply filter cloths is pressed and dewatered by the roll pressure and surface pressure. A roll draining device for a belt press, characterized in that a highly absorbent water-absorbing cloth that hangs down in contact with the cloth is provided at a position where the filter cloth and the roll come into contact.