JPS5814806B2 - Slurry water dewatering equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a slurry water dewatering device.

For example, trains or conveyors are generally used to transport coal.

However, for long-distance transportation to remote locations, slurry transportation is superior in terms of equipment costs and transportation costs.

When transporting coal slurry, the coal is pulverized to a particle size suitable for transport, thereby saving the power required for transport and reducing tube wear.

Before burning the transported coal, it is necessary to separate the coal slurry into coal and slurry water.

Slurry water separation methods include gravity dewatering, mechanical dehydration,
There are various methods such as centrifugal dehydration, but gravity dehydration is the simplest method.

When coal slurry is dehydrated by gravity, the slurry water passes through a conduit in which gaps between coal particles are formed continuously, but this conduit is very narrow and capillary action occurs, so the gravity acting on the slurry water is A phenomenon occurs in which the surface tension of the slurry water and the surface tension of the slurry water are balanced at a certain level, and it is known that water in this range cannot be dehydrated by the action of gravity alone.

The present invention has been devised to eliminate such inconveniences, and embodiments thereof will be described below with reference to FIGS. 1 to 4.

In FIGS. 1 and 2, 1 is a slurry tank,
The terminal end of the slurry delivery pipe 2 faces the top thereof.

A large number of holes are bored in the bottom plate 3 of the slurry storage tank 1 at predetermined intervals, and a vertical drain pipe 5 is provided between these holes 3A and a collecting pipe 4 arranged at the lower part of the bottom plate 3.

The drain pipe 5 has a length l of about 1 m downward from the bottom of the slurry storage tank 1, and as shown in FIG. ing.

When in the closed state, it acts as a drain pipe 5.

Reference numeral 7 denotes bolts and nuts for connecting the two half-cylindrical members 5A and 5B.

Reference numeral 8 denotes a compressed air supply pipe, which communicates with a jet nozzle 9 attached to the bottom plate 3 and directed toward the inside of the tank via a branch pipe 8A.

10 is a matte filter. This mat-like filter 10 is constructed by putting sand 11 with excellent water permeability into a bag-like fiber filter 12 to form a mat-like shape of a constant thickness, and then stitching this into a quilting type.

According to such a mat-like filter 10, the sand 1 is
1 can be prevented from clumping together.

The mat-like filter 10 is laid on the bottom plate 3 so as to cover the entire bottom surface of the slurry reservoir 1, as shown in FIG.

Reference numeral 13 denotes a columnar filter, and like the matte filter 10, sand 14 having excellent water permeability is placed inside a bag-shaped fiber filter 15 to form a columnar shape.

This columnar filter 13 is loaded inside the drain pipe 5 over its entire height.

The drain pipe 5 is opened as shown by the imaginary line in FIG.

Note that 16 is a crimp wire mesh that covers the hole 3A of the bottom plate 3.

Here, the total filter pressure L due to the mat filter 10 and the columnar filter 13 is within a range where the surface tension of the slurry water and the action of gravity are balanced and dewatering is impossible when the slurry water is gravity dehydrated. It is at least larger than the layer thickness.

In the above process, the coal slurry S is introduced into the slurry reservoir tank 1 from the slurry delivery pipe 2 and left to stand still.

vinegar. In the coal slurry S in the rally tank 1, while the coal particles settle and accumulate, the slurry water W passes through the mat filter 10 and the columnar filter 13 by gravity, reaches the collecting pipe 4, and is then collected for reuse. Sent to processing equipment.

In this way, the slurry water W is dehydrated from the coal seam C, but a portion of the slurry water remains in the mat filter 10 or columnar filter 13 within the range where the surface tension of the slurry water and gravity are balanced. do.

However, since this slurry water has been dehydrated from the coal seam C, the dehydration effect of the coal seam C is excellent.

As mentioned at the beginning, dewatering is carried out through capillary channels between coal particles in coal seam C, but if these are blocked during dehydration, dewatering stops and dewatering efficiency decreases.

In such a case, compressed air A is sent from the air supply pipe 8 to the jet nozzle 9, and the air is supplied from the nozzle 9 into the inside of the coal seam C.

As a result, a capillary path is formed in the coal seam C, so that dewatering efficiency can be prevented from decreasing.

Such air supply may be performed at regular intervals, or may be performed by visually monitoring the water level in the slurry tank 1 and when the water level has accumulated.

The best air supply interval and air supply duration are 1 slurry tank.
This can be confirmed experimentally from the dimensions of

Although the case where the coal slurry is dehydrated has been described above, the same applies to the dehydration of other slurries containing solid content.

As described above, according to the present invention, the solid content layer within the range where slurry water balances its surface tension and gravity can be replaced with a mat-like filter and a columnar filter, so that at least the solid content layer contains slurry water. No accumulation occurs.

Therefore, despite gravity dehydration, the water content ratio of the solid layer can be lowered.

Furthermore, since compressed air can be supplied into the solid content layer, it is possible to constantly form a dehydration pipe in the solid content layer.

Therefore, dewatering efficiency is also improved.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a view taken along the line X-X in FIG. Partial cutaway perspective view, Figure 4 is the 1st
It is an enlarged view taken along the Y-Y arrow in the figure. 1...Slurry tank, 2...Slurry delivery pipe, 3...
・Bottom plate, 4... Collecting pipe, 5... Drain pipe, 8... Compressed air supply pipe, 9... Fumes nozzle, 10... Matt filter, 13... Column filter, S. ...Coal slurry, W...Slurry water, A...Compressed air,
C...Coal seam.

Claims (1)

[Claims] 1 A slurry tank, a drain pipe extending downward from the bottom of the slurry tank, a mat-like filter laid on the bottom of the slurry tank, a columnar filter loaded inside the drain pipe, and a jet nozzle attached to the bottom of the slurry tank to collect slurry. A slurry water dewatering device characterized by having a compressed air common supply pipe that supplies compressed air into a storage tank.