JPS634499Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device that granulates and separates suspended solids from a suspension containing suspended solids into granular solids, and allows the separated liquid and granules to flow out separately. be.

In the past, many devices have been devised and put to practical use in order to convert suspended solids in suspension into pellet-like solids that are easy to handle, but as the scale of practical use has expanded, new devices Similar problems have also emerged.

That is, the concentration of solids in the tank plays an important role as a condition for pellet production, and it was difficult to produce pellets at a solid content of 30 g/min or less. however,
Many industrially generated suspensions have a solids concentration of 30
g/ or less. Even if the solids concentration is low, if the true specific gravity of the solids is high, the specific gravity of the pellets will also increase and the pellets will be concentrated in the tank, so there is no problem. The true specific gravity of is also usually small.

In such cases, it is quite difficult to maintain a concentration of 30 g/min or more in the tank, and good pellets are often not produced.

Overcoming these difficulties, the suspended solids concentration can be reduced to 30
A granulating device with a concentrating mechanism as shown in Japanese Utility Model Application Publication No. 165215/1983 has been devised as a device that can be applied to suspensions with a low concentration of less than 100 g/g/g/g/g/g/g/g/g/g/g/g/g/g/g/g/g/g/g/g/kg or less.
This device certainly concentrates suspended solids in the tank,
It is possible to produce better pellets than before, but when the liquid that has been concentrated in the tank and formed pellets overflows to the outside of the tank, in a steady state the solids concentration of the overflow liquid is lower than that of the supplied liquid. The concentration of solids became equal to the concentration of solids, and the load on the gravity dewatering process, especially due to screens at the subsequent stage, had a non-negligible effect.

The object of the present invention is to provide an apparatus that can dramatically improve concentration performance compared to the conventional apparatus, produce extremely good pellets, and reduce the burden of the subsequent dehydration process.

That is, the present invention is configured such that the suspension liquid and the granulating agent can be supplied into the tank body for granulating and separating the suspended substances by causing a suspension liquid containing suspended substances to flow therein. A rotor is provided in the lower part of the tank body to generate a swirling flow, and a guide hollow cylinder is provided above the rotor and below the liquid surface, and inside the guide hollow cylinder and An internal hollow cylinder is provided so that its upper end is located above the liquid level, and a separated liquid outflow pipe is provided so that the separated liquid in the tank body flows out from inside the internal hollow cylinder, and a granulation flow is supplied to the tank body. It is characterized by having an exit pipe.

An embodiment of the present invention will be described with reference to the drawings.The tank body 1 has a cylindrical shape with no obstacles inside, or a similar cylindrical shape or other shape suitable for swirling flow. A suspension supply pipe 2 and a granulating agent injection pipe 3 are connected to the lower part of the tank body 1. It is also possible to open in 2. Further, a rotary blade 5 is provided at the lower part of the tank body 1 to generate a swirling flow in the liquid in the tank, and a guide hollow cylinder 6 is provided above the rotor blade 5, the upper end of which is slightly below the liquid level. Deploy it so that it is located at The shape of the rotary blade 5 may be any shape as long as it imparts a swirling flow to the liquid in the tank. For example, a paddle-shaped blade or the like is used, and the number of stages thereof is determined as appropriate. The guide hollow cylinder 6 has a cylindrical shape similar to the tank body or a cylinder shape similar to this, and is supported by a rib (not shown) on the rotating shaft 9 of the rotor blade 5, or is suspended from above the tank or fixedly supported on the tank inner wall. , it is reasonable to set the outer diameter to the length of the rotor blade 5 or around it, and it is possible to arbitrarily select a rotating or fixed guide tube.

Further, an internal hollow cylinder 7 is provided inside the guide hollow cylinder 6 above the rotor blade 5 so that its upper end protrudes above the liquid surface, and above the internal hollow cylinder 7, a separated liquid outflow pipe 4 is connected in an open manner. It has been done. The inner diameter of this internal hollow cylinder 7 is smaller than that of the guide hollow cylinder 6, and
The inner diameter must be at least 30 to 70 mm larger than the inner diameter of the guiding hollow cylinder 6.
% is preferable. In the illustrated example, the internal hollow cylinder 7 and the guide hollow cylinder 6 are both cylindrical bodies, and are arranged concentrically.

Further, a granulated material outflow pipe 8 is connected to the tank body 1 through an opening, and the opening of this granulated material outflow pipe 8 is preferably at approximately the same level as the opening of the separated liquid outflow pipe 4, and its installation direction is shown in the figure. It is not necessarily in the tangential direction as in the example shown, but can be chosen arbitrarily along with its location.

In the figure, 9 is a rotating shaft that supports the rotor blade 5, and 10 is a drive device.

Therefore, when the suspension is supplied from the supply pipe 2 to the lower part of the tank 1 and at the same time an appropriate amount of granulation agent is injected from the injection pipe 3, the extrusion flow by the rotary blades 5 and the circulation flow by the guiding hollow cylinder 6 occur. , a pellet is gradually formed. In the internal hollow cylinder 7, since the sedimentation speed of the pellets exceeds the upward flow rate, the pellets settle upwards in the tank, and only the separated liquid is discharged through the outflow pipe 4.

On the other hand, from the granulate outflow pipe 8, a liquid with a concentration almost equal to the concentration of the supplied suspension is discharged at first, but the concentration of solids in the tank gradually increases, and eventually the liquid is discharged. An equilibrium state is reached at a concentration that is balanced with the amount of separated liquid used, and from then on, pellets concentrated to that concentration are continuously discharged.

As described above, the present invention is configured to actively cause concentration in the granulation tank and to take out the separated liquid and the concentrated liquid containing the granules separately. It produces beneficial effects.

Large processing capacity per unit capacity.

The processing capacity is determined by the rising flow rate inside the internal hollow cylinder (called the separation zone), and in order for separation to occur, it must be lower than the sedimentation rate of the pellets, but in this invention, only the separated liquid is taken out from the separation zone. As a result, the load is reduced and more suspension can be supplied accordingly.

The concentration rate of the suspension in the tank increases.

If the amount of liquid to be supplied is constant, the upward flow rate in the separation zone will be small, making it easier for solid-liquid separation to occur, increasing the concentration rate and improving the quality of pellets.

The load on the gravity dewatering process due to the subsequent screen, etc. is reduced.

There is no need to treat the clarified separated liquid, and only the concentrated pellets need be subjected to gravity dehydration, which simplifies the process.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a longitudinal sectional view and FIG. 2 being a plan view. DESCRIPTION OF SYMBOLS 1... Tank body, 2... Supply pipe, 3... Injection pipe, 4... Separated liquid outflow pipe, 5... Rotating blade, 6... Guide hollow cylinder, 7... Internal hollow cylinder, 8... Granule outflow pipe, 9... Rotation axis, 10
...Drive device.

Claims (1)

[Claims for Utility Model Registration] 1. A tank body for granulating and separating suspended substances by introducing a suspension liquid containing suspended substances into the tank body, capable of supplying the suspension liquid and a granulating agent into the tank body. A rotary blade is provided in the lower part of the tank body to generate a swirling flow, and a guide hollow cylinder is provided above the rotor blade and located below the liquid surface, and the guide hollow cylinder is configured as follows. An internal hollow cylinder is provided so that the upper end is located on the inside of the tank body, and a separated liquid outflow pipe is provided so that the separated liquid in the tank body flows out from inside the internal hollow cylinder. A suspension concentration type granulation device, characterized in that a granulation material outflow pipe is provided in the granulation device. 2. The suspension concentration type granulating device according to claim 1, wherein the openings of the separated liquid outflow pipe and the granulated material outflow pipe are set at substantially the same level. 3. The granulation device according to claim 1, wherein the internal hollow cylinder and the guide hollow cylinder are both cylindrical. 4 Utility model registration claim 3, in which the internal hollow cylinder and the guide hollow cylinder are arranged concentrically.
The granulation device described in Section 1. 5. The granulation device according to claim 1, 2, 3, or 4, wherein the inner diameter of the inner hollow cylinder is 30 to 70% of the inner diameter of the guide hollow cylinder.