JPS5811016A - Belt press type dehydrator - Google Patents

Abstract

PURPOSE:To improve dehydration efficiency and to compress the entire part of sludge surface evenly by making it possible to exert pressure upon the sludge irrespectively of the tension of filter cloths and using diaphragms. CONSTITUTION:When the leading end 11a of the sludge 11 supplied and inserted between filter cloths 1 and 2 arrives at the trailing end 3a of a compressing mechanism 3, the progression of the filter cloths, 1, 2 and the supply of the sludge are stopped; at the same time, pressurized water is injected between a diaphragm plate 9 and a diaphragm 10 to bring the filter cloths 1, 2 into press contact with the stationary plate 6 in a stationary part 4, thereby dehydrating the sludge. Upon lapse of the preset pressure and time, the injection of the pressurized water is stopped and the pressurized water is discharged to release the press-contacting of the filter cloths 1, 2, then the supply of the sludge and the progression of the filter cloths 1, 2 are resumed. When the filter cloths 1, 2 advance by the distance equivalent to the length of a compressing mechanism 3, a pressurizing part operates and the sludge is dehydrated in the same manner as mentioned above. The dehydrated sludge 11 is stripped in the position where the filter cloths 1, 2 separate in the advance direction, and the stripped sludge is removed to the outside.

Description

[Detailed description of the invention] The present invention relates to a belt press type dehydrator.

For example, if sludge with a high moisture content is disposed of as it is, it will pollute rivers, oceans, etc., and effective treatment of sewage sludge is desired from the viewpoint of preventing pollution.

Normally, sludge is dehydrated under pressure and then incinerated or directly disposed of, but in conventional dewatering mechanisms, sewage sludge, such as sewage sludge, is separated between two sheets of cloth under tension by multiple rolls. A dewatering machine is widely used, in which sludge is inserted and R cloth is rotated in the same direction to sequentially dewater the sludge using the compression pressure of two P cloths. There are two types of dehydrators: one that relies only on the tension of two sheets of p-cloth as described above, and one that uses rolls directly facing each other and in contact with each other. In the former method, the maximum tension is applied to the relatively soft sludge, taking into account the protrusion of the sludge from both sides of the f cloth, and the maximum pressure possible is applied to the sludge. The operational limit is that the P fabric breaks when a tension above a certain level is applied to the R fabric. This limit is 30
It is about K9, and the pressure on one cloth on the roll obtained from this tension depends on the roll diameter, but the roll diameter is 100 to 30.
In the case of zero exposure, it is 2 to 3 Kg/cr/l. There is a limit to how many types of sludge can be dehydrated in response to such pressure, and this has been considered the limit of belt press type dewatering machines.

As an improvement to the above, a mechanism has been developed in which a high-tension belt, such as the ■ belt, is pressed from the outside via three rolls to the rolls around which two sheets of P cloth circulate. This method uses a belt with higher tension than one piece of cloth, so
Although the compression pressure is higher than that of the cloth itself, there is a limit to this, and the actual pressure measured is 4 to 5 Kg/cr/l. Therefore, since the subsequent operation is a thermal operation such as drying or incineration, even stronger compression pressure is required if the water in the sludge is to be removed as much as possible to save energy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dehydrator that overcomes the drawbacks of the prior art as described above and meets the requirements as described above.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is an overall view showing one embodiment of the dehydrator of the present invention, in which two upper and lower endless f-cloths 1 and 2 are arranged between a plurality of rollers so that they can overlap in parallel while traveling in the same direction. It is set up on. A squeezing mechanism 6 is installed at the parallel overlapping portion of the two pieces of 1-cloth 1.2. As shown in FIG. 2, this squeezing mechanism 6 has a structure in which a fixing part 4 and a pressing part 5 are disposed opposite each other with cloths 1 and 2 interposed therebetween.

The fixing part 4 has a metal flat fixing plate 6 parallel to the cloths 1 and 2.
The periphery of the fixing plate 6 may be reinforced and supported by a fixing frame 7, and chevron-shaped or uneven grooves may be formed in parallel on the entire surface of the fixing plate 6 facing the f cloth 2. A large number of through holes 8 may be formed as shown in FIG. Further, the pressurizing part 5 is located on the inner surface of a metal diaphragm plate 9 parallel to the r cloth 1.degree. are closely fixed, and pressurized water can be injected and discharged between the diaphragm plate 9 and the diaphragm 10.

While cloth 1 and cloth 2 advance, cloth 2 may slide in contact with fixed plate 6, but a gap should be formed between cloth P 1 and diaphragm plate 9 and diaphragm 10 of pressurizing section 5. .

The present invention has the above configuration, and the usage state will be explained next.

The sludge 11, which looks like sewage sludge, is currently being separated into two upper and lower sheets.
Before the fabric 1.2 is polymerized, it is continuously supplied onto the 1 fabric 2, and is inserted between the P fabrics 1.2 and advances. If the cloths 1 and 2 are stretched around a plurality of intermediate rollers in the process of reaching the squeezing mechanism B, the sludge 11 can be made into a viscous body that has been dehydrated to some extent by the pressing action of each roller. When the leading end 11a of the sludge 11 fed and inserted between the P cloths 1 and 2 reaches the rear end 3a of the squeezing mechanism 6 in the advancing direction, the advancement of the Sawa cloths 1 and 2 and the supply of sludge are stopped, and at the same time the diaphragm plate 9 By injecting pressurized water between the diaphragm 10 and the diaphragm 10, the diaphragm 10 bulges outward, and the sludge is inserted into the P cloth 1.
, 2 are pressed against the fixing plate B of the fixing part 4 to remove water contained in the sludge. After the preset pressure and time have elapsed, the injection of pressurized water is stopped and the pressurized water is discharged, so that the diaphragm 10 contracts and releases the pressurized contact between cloths 1 and 2, and sludge is supplied and cloths 1 and 2 advance. is restarted, and when the f cloths 1 and 2 have advanced the distance of the length of the pressing mechanism B, the pressurizing section 5 is activated and the sludge is dewatered in the same manner as described above. Therefore, if the sludge supply and stop, the advance and stop of the P cloth 1゜2, and the pressurization and release of the squeezing mechanism 6 are operated synchronously, the sludge dewatering process can be automated and continuous. can be done. The sludge 11 after dewatering is covered with two pieces of r cloth 1,
2 is separated in the direction of travel and taken out to the outside.

FIG. 3 shows another embodiment of the fixing part 4, in which the same parts as those described above are given the same reference numerals.

In this embodiment, the lower surface of the fixing plate B having a large number of through holes 8, that is, the entire surface of the fixing plate 6 opposite to the surface facing the P cloth 2 is covered with a cover 12 to form the squeezed liquid outlet 13. It is characterized by the fact that it has been formed.

By configuring the fixing part 4 as described above, the diaphragm 1
The r cloth 1.2 into which the sludge has been inserted is pressed against the fixing plate 6, and when the sludge is dehydrated, the dewatering liquid is introduced into the cover unit 12 through the through hole 8 of the fixing plate 6 and from the discharge port 16. The drained dehydrated liquid is discharged from a discharge pipe (not shown) between the P cloth 2 and the fixing plate 6.
There is no chance of water falling into the surrounding area and getting the equipment wet.

However, if the discharge port 16 is directly connected to, for example, a vacuum pump, the dehydrated liquid can be forcibly sucked and discharged, and water will not be absorbed back into the dehydrated sludge.

According to the present invention described in Section 2, pressure can be applied to the sludge regardless of the tension of the cloth, so the dewatering efficiency is extremely good, and since the diaphragm is flexible, the sludge surface has an uneven surface. The entire surface can be squeezed evenly.

Similarly, in the above description, the case where the squeezing mechanism is installed horizontally has been explained, but it goes without saying that it may be installed slanted or vertically. Furthermore, a plurality of squeezing mechanisms may be installed in the traveling direction of the r-cloth to perform primary dewatering, secondary dewatering, etc. depending on the state of the sludge.

The drawings show one embodiment of the present invention; FIG. 1 is a front view of the entire device of the present invention, FIG. 2 is an enlarged cross-sectional view with a part of the squeezing mechanism omitted, and FIG. 3 is a view of other parts of the fixing part. It is a sectional view showing an example.

1.2 is r cloth, 6 is a compression mechanism, 4 is a fixed part, 5 is a pressurizing part, 6 is a fixed plate, 8 is a through hole, 9 is a diaphragm plate, 10 is a diaphragm, 12 is a cover integrated, 16 is a press This is a liquid outlet.

Patent applicant: Tsukishima Kikai Co., Ltd. Agent Patent Attorney Product 1) Tadashi Teru

Claims (1)

[Claims] (1) A squeezing mechanism 6 is installed at the parallel overlapping part of two R cloths 1 and 2 stretched so that sludge can be supplied and inserted and circulated intermittently. 6, the periphery of the diaphragm 10 made of a flexible material is closely fixed to the diaphragm plate 9, and the pressurizing part 5, which is capable of injecting and discharging pressurized water, is connected via cloths 1 and 2. A bell 1-press type dehydrator characterized in that it is formed in a parallel shape. (2. In the Bell i-press type dehydrator described in claim 1, the fixing part 4 is the entire surface of the fixing plate 6, which has a large number of through holes 8, opposite to the surface facing the saw cloth 2. The cover 1
A belt press type dehydrator characterized in that the belt press type dehydrator is coated with a compressed liquid discharge port 16.