JPS6146399A - Belt press type dehydrator - Google Patents

Abstract

PURPOSE:To improve efficiency of dehydrating by providing a low frequency induction heating coil in a dehydrating roller in which two, upper and lower, filter cloths holding sludge to be disposed between are stretched, and making above- mentioned sludge heatable, and thereby lowering viscosity of pore water. CONSTITUTION:The sludge to be disposed is supplied to a throwing port 16 and held between two, upper and lower, beltlike filter cloths 12, 13 and carried to plural dehydrating rollers 14. The sludge held by the filter cloths 12, 13 is dewatered by compressing force etc. between the rollers 14, and at the same time, heated by a low frequency induction heating coil 15. Accordingly, viscosity of pore water between particles contained in the sludge is lowered and becomes easy to extract water.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a belt press type dehydrator, and particularly to a belt press type dehydrator for dehydrating sludge etc. generated from sewage and industrial wastewater to obtain a dehydrated cake. A belt press type dehydrator that heats the sludge using a low-frequency induction heating coil during the process of pressurizing and dewatering the sludge to reduce the viscosity of the water contained in it and increase dewatering efficiency. It is related to.

[Prior Art] A belt press type dehydrator is known as one of the devices for dewatering sludge generated from municipal sewage and industrial wastewater to produce a dehydrated cake.

A conventional belt press type dewatering machine employs the configuration shown in Fig. 4. As shown in the figure, the belt press type dehydrator 1 mainly consists of two upper and lower filter cloths 2.3 formed in an endless shape, and a dewatering roller 4 for wrapping the filter cloths 2 and 3 over each other to press them. It is composed of.

Furthermore, an input port 5 is formed in one of the two upper and lower filter cloths 2 and 3 so that the space between them is set large, and the sludge to be treated is received between the filter cloths 2 and 3. Further, the input port 5 is provided with an input tank 6 for inputting sludge to be treated. On the other hand,
On the opposite side of the input port 5, upper and lower filter cloths 2 and 3 are separated at a predetermined interval to form a dehydrated cake discharge lower. The dewatering roller 4 extends from the input port 5 side to the discharge lower side, and includes a plurality of rollers 8.9, 10°11 whose diameters are successively smaller.
．． 12, 13, etc., and is configured to sequentially increase the pressing force between the filter cloths 2 and 3 that are alternately stretched over these cloths. Therefore, while the sludge to be treated inputted from the input port 5 is sandwiched between the filter cloths 2 and 3 and transferred between the dewatering rollers 4, the surface pressure and the The sludge sandwiched between 2 and 3 is sequentially dehydrated by the shear force generated, and is discharged as a dehydrated cake from the discharge lower.

For example, when municipal sewage sludge is treated with this belt press type dehydrator, the resulting dehydrated cake has a moisture content of about 78 to 70%.

[Problems to be Solved by the Invention] In the belt press type dehydrator having the above configuration, the filter cloth 2,
The surface pressure generated between 3 and the dewatering roller 4 is Q/a between 7 and 8.
It was believed that it was not possible to obtain a dehydrated cake with an even lower water content.

In particular, even if pressurization or shear force is simply applied to the sludge sandwiched between the filter cloths 2 and 3 between the dewatering rows 54, the viscosity of the pore water existing between the sludge particles can be sufficiently reduced. There was a problem that it was impossible to improve the dewatering efficiency.

[Object of the Invention] The present invention was devised to effectively solve the problems of conventional belt press type dehydrators.

An object of the present invention is to provide a belt press type dehydrator that can reduce the viscosity of pore water existing between particles of sludge to be treated and increase dewatering efficiency as much as possible.

[Summary of the invention] In order to achieve the above object, the present inventors discovered that the viscosity of the pore water existing between particles of sludge to be treated decreases as the temperature rises, and the inventors applied low frequency M4 heating to the dewatering roller. The present invention is configured by providing a coil, and the sludge to be treated that is sandwiched between filter cloths and transferred under pressure is heated or heated to dehydrate it.

[Example] Next, one embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a belt press type dehydrator 11 according to the present invention has two upper and lower filter cloths 12.
13, a dewatering roller 514 for overlapping these filter cloths 12 and 13 to pressurize them, and sludge to be treated that is attached to these dewatering rollers 14 and transferred while being sandwiched between the filter cloths 12 and 13. It is mainly composed of a low-frequency induction heating coil 15 for heating.

An inlet 16 is formed in one of the two upper and lower filter cloths 12 and 13, with a large gap therebetween, for charging the sludge to be treated between the filter cloths 12 and 13. In addition, the input port 16
Input M! is used to input the sludge to be treated. 17 are provided. A stirring blade 18 for stirring the sludge to be treated is provided in the input tank 17, and is configured to supply the stirred sludge to the input port 16.

On the other hand, on the opposite side of the inlet 16, there is formed a water supply outlet 19 in which upper and lower filter cloths 12 and 13 are spaced apart at a predetermined interval.

Similar to the conventional example, the dewatering roller 14 is composed of a plurality of rollers 20, 21, 22, 23, 24, 25, etc. whose diameters are successively reduced from the input port 16 side to the discharge port 19 side, and rollers 20, 21, 22, 23, 24, 25, etc. are applied alternately to It is configured to sequentially increase the pressure between the passed filter cloths 12 and 13.

The feature of the present invention is these dehydration rows.

14, as shown in FIG. 2, a low frequency induction heating coil 15 is installed.
The reason is that the . As shown in FIG. 2, a low-frequency induction heating coil 15 is attached to the dewatering roller 14 in a spiral manner along its axial direction. Further, one side of the rotating shaft 27 of the dehydration row 514 is extended to the outside of the phase receiver 26, and a power supply device !28 for supplying power to the low frequency induction heating coil 15 is provided thereon. ing.

Next, the operation of the present invention will be explained.

As shown in FIG. 1, the sludge to be treated is supplied from the input tank 17 to the input 016, sandwiched between the upper and lower filter cloths 12 and 13, and transferred between the dewatering rollers 14. As shown in FIGS. 2 and 3, the sludge to be treated is sandwiched between the dewatering row 514 by the upper and lower filter cloths 12, 13.
The compressing force generated between the rollers 14 and the shearing force due to the speed difference between the upper and lower filter cloths 12 and 13 is used to process the low circumference 3! It is heated by the induction heating coil 15.

In particular, the viscosity of the pore water between sludge particles is 1.002 (
CE)), 0.653 (Cl)) at 40°C, 80
Since the temperature decreases as the temperature rises to 355 (cp) at 0.degree. C., the sludge to be treated is specifically heated from 40.degree. C. to 80.degree. C. using the low frequency induction heating coil 15. Therefore, the interparticle water contained in the sludge to be treated is separated (this means that a dehydrated cake with a sufficiently low water content is released from the discharge port 19).
4 will be obtained continuously.

Furthermore, although the low frequency induction heating coil 15 is provided on all the dewatering rollers 14 in the illustrated example, it is only necessary if the sludge to be treated can be heated to the desired temperature.

[Effects of the Invention] As is clear from what has been described in detail above, the present invention exhibits the following excellent effects.

(1) While dewatering the sludge while pressurizing it with a dewatering roller, it can be warmed or heated to reduce the viscosity of interparticle water and dehydrate, making it possible to produce a dehydrated cake with a low water content. Obtainable.

■ By simply attaching a low-frequency induction heating coil to the dewatering roller, the sludge to be treated can be pressurized and heated during dewatering.It has a simple configuration and is highly versatile as it can be easily adopted in existing dewatering machines of this type. .

[Brief explanation of the drawing]

Fig. 1 is a schematic side sectional view showing one embodiment of the present invention, Fig. 2 is an enlarged plan view of the main part, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, and Fig. 4 is a conventional example. FIG. The Qν1 of Ru 771 is 7 (reminai L)
14 is a dehydration O-ra, 15 is a low frequency M4 heating coil, 1
6 is a sludge inlet, and 19 is a dehydrated cake outlet. Patent applicant: Ishikawajimaban 1ffl Kogyo Co., Ltd. Agent Patent attorney Nobuo Kinutani, Yukiko Ko, 1z1 Koyo Tei Kennaka, IJ Shima 11 Naka, Figure 2, 27'-Figure 4

Claims (1)

[Claims] In a belt press type dewatering machine, two belt-shaped filter cloths (upper and lower) are alternately stretched between a plurality of dewatering rollers, and the sludge to be treated is sandwiched between these filter cloths and transferred while being pressurized between the rollers for dewatering. A belt press type dehydrator, characterized in that the dewatering roller is provided with a low frequency induction heating coil for heating the sludge to be treated, which is sandwiched between the filter cloths and transferred under pressure.