JPS62230499A - Operating method for sludge dehydrator - Google Patents

Abstract

PURPOSE:To improve dehydration efficiency by providing planetary rollers revolving in circumscription with a sun roller and making the revolving direction of the planetary rollers to coincide with the traveling direction of filter cloth belts. CONSTITUTION:The sun roller 13 and the planetary rollers 14 are freely rotatably provided to supporting members 17. The outside peripheral gear parts of the members 17 are engaged with pinion gears 20 driven by variable speed motors. The members 17 are rotated by a chain wheel 18 and the gears 20. The planetary rollers 14 revolve around the sun roller 13. Sludge 1 is pressurized and dehydrated by press rollers 8 and while the sludge is held sandwiched by the filter cloth belts 3, 4, the sludge travels on the outside of the rollers 14 and receives shearing force by the rollers 14. The revolving speed of the rollers 14 and the traveling speed of the belts 3, 4 are in the same direction and are freely adjustable. The backward movement of the water in the sludge 1 is, therefore, prevented and the bleeding of the sludge is prevented. The dehydration efficiency is improved by the above-mentioned method.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of operating an apparatus for continuously dewatering sludge generated in the treatment of water, sewage, industrial wastewater, and other water.

[Conventional technology]

There are many types of dewatering apparatuses in which an endless filter cloth belt is movably hung around a plurality of roller groups in a face-to-face polymerized state, and sludge is pressurized and dewatered while being held between these filter cloth belts. Among such dewatering devices, a shearing dewatering section is provided with a plurality of shearing rollers following the pressurizing dewatering section, and the shearing rollers apply shearing force to the sludge that has been pressurized and dehydrated between the furnace cloth belts. A device that performs shear dewatering with improved dehydration effects is attracting attention.

[Problem that the invention seeks to solve]

However, the number of times of shearing in such a shear dewatering section is determined by the number of shearing rollers, but since the sludge is soft, it tends to protrude from the furnace cloth belt, and in order to prevent this sludge from protruding, high-pressure dewatering must be performed immediately. In many cases, the expected dehydration did not occur.

The present invention makes it possible to appropriately adjust the number of times of shearing by a shearing roller in the shearing dewatering section of the sludge dewatering device in order to prevent sludge from protruding and to perform accurate dewatering in accordance with the properties of the sludge. This is an attempt to improve sludge dewatering efficiency.

[Means for solving problems]

In the present invention, an endless cloth belt is movably hung around a plurality of roller groups in a face-to-face polymerized state, and the sludge is compressed between these furnace cloth healds and sheared while applying shearing force using a plurality of shearing rollers. In the 1T3 mud dehydration apparatus, a shearing dehydration section is provided to perform dewatering, and the shearing dehydration section consists of a sun roller and a planetary roller that circumscribes the sun roller and applies the shearing force. This invention provides a method for operating a mud skin dewatering apparatus, characterized in that the apparatus is operated with the revolution direction being the same as the running direction of the cloth belt.

[Effect]

The operation of the present invention will be explained with reference to the drawings showing one embodiment of the present invention. Fig. 1 is an explanatory view of the overall configuration, and shows an endless filter cloth belt 3 provided with a supply section 2 for sludge l, , lη
An endless filter cloth heald 4 that is not supplied with mud 1 is connected to a drive device 5 and rotates at the same speed as a drive roller 6.6.
& a plurality of roller groups 7, 7, . . . so as to be able to run in parallel in a face-to-face overlapping state.

In addition, opposing pressure rollers 8.8 are provided at the overlapping portion of the furnace cloth healds 3 and 4.
．． Following the running direction of 4, a shearing dehydration section S consisting of a sun roller 13 and a plurality of planetary rollers 14, which will be described later, is provided, and a fabric belt 3.4 runs over this shearing and dehydration section S for polymerization, and then is compressed. After passing through the rollers 9, the cloth belts 3 and 4 are separated, and the dehydrated cake 10 is rolled and falls onto a conveyor 11.

In the figure, reference numeral 12 indicates a cleaning device for each cloth belt 3.4.

Furthermore, as shown in FIGS. 2 and 3, the structure of the shear dewatering section S includes a sun roller 13 and a plurality of 'A's circumscribing the sun roller 13.
Both ends of the rotating shaft 15 of the sun roller 13 are rotatably held by a frame 16, and both the sun roller 13 and the planetary rollers 14 are provided with a circular support member having gears formed on the outer periphery. The outer gear portion of the support member 17 is meshed with a pinion gear 20 that is rotated by a chain wheel 18 connected to a variable speed motor (not shown) via a chain 19. That is, the variable speed motor rotates the support member 17 via the chain wheel I8 and the pinion gear 20, and along with the rotation, the planetary roller 1
4 will revolve around the sun roller 13.

The sludge l to be dewatered travels from the supply section 2, is fed onto the fabric belt 3, is transported while being dehydrated by gravity, is turned and polymerizes face-to-face with the furnace fabric belt 4, and sludge 1 While being held between the cloth belts 3 and 4, the water reaches the pressure roller 8 and is dehydrated under pressure.

Next, the pressurized and dewatered sludge reaches the shear dewatering section S while being held between the furnace cloth belts 3.4, runs outside the plurality of planetary rollers 14 under tension, At this time, by rotating the support member 17 with a motor, the superposition running at the revolution speed (2) of the planetary roller 14 shown in FIG. becomes possible. Therefore, the contact portion between the planetary roller 14 and the polymerization furnace cloth belts 3, 4 moves by the relative speed caused by the difference between the revolution speed vl of the planetary roller 14 and the running speed v2 of the polymerization cloth heald 3.4, and Efficient dewatering is performed by increasing or decreasing the number of times of shearing by the rollers 14.

Further, in the above embodiment, the support member 17 is driven to cause the roller 14 to revolve around the sun roller 13, but the sun roller 13 is driven to rotate, and the support member 17 is rotated in relation to this rotation. The Mm roller 14 can also revolve together with the Mm roller 17.

Furthermore, in the present invention, since the direction of revolution of the planetary roller 14 is the same as the running direction of the cloth healds 3 and 4, as shown by the arrow in FIG. The sludge moves to the outlet side of the dewatered cake without moving backwards to the side, thereby preventing an increase in moisture on the side where the sludge is trapped.As a result, sludge is prevented from protruding from the furnace cloth belts 3 and 4. be done.

The sludge that has undergone pressure dewatering and shear dewatering in this way is
The cloth belt 3 is then compressed by a pressing roller 9.
4 is separated, and the dehydrated cake 10 peels off and falls and is conveyed by the conveyor 11.

Although the shearing and dewatering section S is arranged at one location in the illustrated example, it can also be arranged at multiple locations along the running path of the polymerized fabric belt 3.4.

〔Effect of the invention〕

As described above, according to the present invention, the number of times of shearing in the shearing dewatering section can be adjusted without being limited by the number of shearing rollers, and while preventing sludge from spilling out, it is always possible to adjust to the properties of the sludge. This makes it possible to improve dehydration efficiency.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is an explanatory diagram of the overall configuration, FIG. 2 is a partially cutaway front view of the shear dewatering section, FIG. 3 is a sectional view taken along the line 1-1 in FIG. 2, and FIG. The figure is an explanatory diagram of the action of the shear dewatering section. 1...lη mud, 2...supply section, 3, 4...furnace belt, 5...drive! A position, 6... Drive roller, 7.
... Roller group, 8 ... Pressure roller, 9 ... Squeezing roller, 10 ... Dehydrated cake, 11 ... Conveyor, 12
...Cleaning device, 13...Sun roller, 14...t
IL roller, 16... Frame, 17... Support member, 18... Chain wheel, 19... Chain, 20... Pinion float, S... Shearing dewatering section.

Claims (1)

[Claims] (1) An endless filter cloth belt is movably hung over a group of rollers in a face-to-face polymerized state, and the sludge is held between these filter cloth belts and sheared while applying shearing force using a plurality of shearing rollers. A sludge dewatering device is provided with a shearing dehydration section that performs dewatering, and the shearing dehydration section is composed of a sun roller and a planetary roller that circumscribes the sun roller and applies the shearing force. A method of operating a sludge dewatering device, characterized in that the device is operated in the same direction as the running direction of the filter cloth belt.