JPS6333897B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a mixing tank with a vertically oriented cylindrical portion and a right-centered conical bottom portion that is continuous with the lower part of the vertically oriented cylindrical portion, and in which the cylindrical portion is provided with The present invention relates to a mixing device equipped with a first nozzle for spouting the liquid to be treated extracted from the mixing tank in order to cause the liquid to swirl around the vertical axis.

As mentioned above, when mixing is performed using the swirling flow caused by the liquid ejected from the nozzle, for example, if the bottom of the mixing tank is made of a flat plate, the inner wall of the mixing tank acts as a brake, especially at the bottom corners. The swirling flow velocity of the pipe is greatly reduced, and caulking material and slurry particles are deposited on the bottom corners, but such problems can be suppressed by providing a conical bottom with a straight core as described above.
However, when the liquid to be treated is extracted from the lower end of the conical bottom for circulation, as is commonly done in the past, air bubbles tend to flow into the extraction channel from the air core due to swirling flow, and Pump problems are likely to occur, and in addition, if the angle between the inner surfaces of the cylindrical part and the conical bottom is made relatively small in order to reduce the overall height of the mixing tank, caulking material and slurry particles may adhere to the corners and accumulate. cannot be avoided.

In view of the above-mentioned circumstances, the present invention aims to effectively prevent air bubbles from flowing into the liquid extraction channel and prevent slurry particles from adhering to the inner surface of the mixing tank due to coking material. purpose.

Next, embodiments of the present invention will be described with reference to illustrative figures.

A vertically oriented cylindrical portion 1a, a right-centered conical bottom portion 1b that narrows downward, and a ceiling portion 1c.
A mixing tank 1 is formed by forming a mixing tank 1, and a supply pipe 2 that continuously supplies a liquid to be treated such as a liquid with a strong coking tendency or slurry in a quantitative manner is connected to the upper part of the mixing tank 1. In order to make the liquid to be treated swirl around the vertical axis, a first nozzle 4 for spouting out the liquid to be treated drawn out from the mixing tank 1 through a pipe line 3 with a first pump is attached, and a first nozzle 4 is attached to the conical bottom part 1b. A second nozzle 5 for blowing up the liquid to be treated from the first pump-equipped pipe line 3 is attached to the lower end, and the second nozzle 5 rotates around the central axis within the conical bottom 1b near the lower end of the conical bottom 1b. Two third nozzles 7a and 7b are provided to eject the liquid to be treated extracted from the mixing tank 1 through separate conduits 6a and 6b with second pumps in order to cause the liquid to flow upward while the liquid is being treated quantitatively. A discharge pipe 8 for continuous discharge is connected to the mixing tank 1, thereby forming an apparatus for continuous mixing treatment and reaction treatment as required.

Each of the first and third nozzles 4, 7a, 7b is provided such that its tip does not protrude into the mixing tank 1 and is oriented substantially tangentially to the inner peripheral surface of the mixing tank 1, This prevents coking substances and slurry particles from adhering and accumulating due to the nozzles 4, 7a, and 7b, and enables efficient swirling of the liquid to be treated within the mixing tank 1.

Said first and second pumped pipe lines 3, 6a, 6
b, and the cylindrical portion 1a and the conical bottom portion 1b in a state in which the inlet of the discharge pipe 8 does not protrude into the mixing tank 1 and is oriented substantially tangentially to the inner peripheral surface of the mixing tank 1. It is arranged near the boundary part A to prevent coking substances and slurry particles from adhering and accumulating due to the inlet side parts of these pipes 3, 6a, 6b, and 8, and to prevent The cylindrical portion 1a and the conical bottom portion 1b
Even if the angle θ between the inner surfaces of the mixing tank is made relatively small and the total height l of the mixing tank is made small, the coking substance can prevent slurry particles from adhering and accumulating near the boundary A.

As mentioned above, when the liquid to be treated from the first pump conduit 3 is distributed and supplied to the first and second nozzles 4 and 5, the liquid to be treated with high concentration can be distributed to the upper and lower parts of the mixing tank 1. This is advantageous in terms of uniform mixing, but for example, it is possible to connect the first pump-equipped pipe 3 to only one of the first and second nozzles 4 and 5, and connect the other pump-equipped pipe to the other. Alternatively, by omitting the second pump-equipped pipelines 6a and 6b, the first pump-equipped pipeline 3 is connected to the first to third nozzles 4, 5, 6a, 6.
b. It is possible to connect to all of the pipes 3 or 6, or to change the flow path configuration in various ways. In short, it is possible to connect to all of
a, 6b may be connected at or near the boundary A between the cylindrical portion 1a and the conical bottom portion 1b.

A plurality of the first nozzles 4 may be provided, or one third nozzle 7 may be provided, and further,
When a plurality of nozzles are provided, the same type of nozzles may be arranged at different positions in the circumferential direction or the vertical direction of the mixing tank 1.

The shapes of the cylindrical portion 1a and the conical bottom portion 1b are not strictly limited to geometrical concepts, and can be changed without impairing the technical idea of the present invention.

In summary, the present invention provides the above-mentioned mixing device, in which the mixing tank 1 is
A second nozzle 5 is provided in the interior of the mixing tank 1 to blow up the liquid to be treated, which is drawn out from the mixing tank 1, so that the liquid to be treated flows upwardly while rotating around its central axis within the conical bottom 1b. The conical bottom 1
A third nozzle 7 ejecting into the mixing tank 1 is provided at or near the boundary A between the cylindrical portion 1a and the conical bottom portion 1b, and a conduit 3 for taking out the liquid to be treated in the mixing tank 1 for circulation. Alternatively, it is characterized in that 6a and 6b are connected.

That is, by maintaining a high flow velocity at the lower end of the conical bottom part 1b by the action of the second nozzle 5, and by maintaining a high flow velocity near the inner surface of the conical bottom part 1b by the action of the third nozzle 7, It is now possible to effectively prevent the adhesion and accumulation of caulking substances and slurry particles on the conical bottom part 1b, and furthermore, the cooperative action of the second and third nozzles 5 and 7 allows the liquid to be treated in the conical bottom part 1b to be removed. By causing the liquid to flow toward the cylindrical portion 1a side and discharging the liquid from the boundary portion A between the cylindrical portion 1a and the conical bottom portion 1b or its vicinity, even if the liquid is Even if the angle θ between the inner surfaces is made relatively small and the total height l of the mixing tank is made small, the flow velocity at and near the boundary portion A can also be maintained high;
The adhesion and accumulation of coking substances and slurry particles can also be effectively prevented, and as a whole, equipment troubles and uneven mixing caused by adhesion and accumulation of caulking substances and slurry particles can be prevented, and good mixing can be ensured. It became like that.

In addition, a pipe line 3 or 6a for taking out the liquid to be treated to be circulated to the mixing tank 1 for uniform mixing;
6b is connected to the mixing tank 1 at a position laterally away from the liquid swirling center, so air bubbles do not flow into the pipes 3 or 6a and 6b from the air core caused by liquid swirling, which prevents problems with the circulation pump. This also effectively suppresses the amount of heat generated, making it possible to ensure even more stable operation of the device.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the mixing device according to the present invention, and FIG. 1 is a schematic longitudinal sectional view, and FIG. 2 is a sectional view taken along the line -- in FIG. 1. 1... Mixing tank, 1a... Cylindrical part, 1b...
Conical bottom, 3 or 6a, 6b...take-out pipe,
4...First nozzle, 5...Second nozzle, 7...Third nozzle, A...Boundary portion.

Claims (1)

[Claims] 1. The mixing tank 1 is equipped with a vertically oriented cylindrical portion 1a and a right-centered conical bottom portion 1b that is continuous at the bottom and narrows downward, and the liquid to be treated is distributed inside the cylindrical portion 1a around the vertical axis. The mixing device is equipped with a first nozzle 4 for spouting out the liquid to be treated extracted from the mixing tank 1 in order to swirl and flow the liquid into the mixing tank 1 from the lower end of the conical bottom 1b. A second nozzle 5 is provided to blow up the liquid to be treated extracted from the mixing tank 1, and the liquid to be treated drawn from the mixing tank 1 is directed upwardly in the conical bottom part 1b while rotating around its central axis. A third nozzle 7 ejecting into the shaped bottom part 1b is provided at or near the boundary part A between the cylindrical part 1a and the conical bottom part 1b,
A mixing device characterized in that a pipe line 3 or 6a, 6b is connected to take out the liquid to be treated in the mixing tank 1 for circulation.