JPS5855804B2 - Powder and liquid mixing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder-liquid mixing device installed in front of a dissolution tank for dissolving highly hygroscopic powder into a liquid.

Conventionally, when dissolving a powder (e.g., a polymer flocculant) in a liquid such as water, it is difficult to properly disperse and mix it in the liquid, which tends to form steplets, so the mixing means shown in Figure 1 has been used. He had been hired.

1 is a mixing tank, and a predetermined liquid is supplied into the mixing tank 1 from a liquid supply pipe 4. As shown in FIG.

A funnel-shaped mixing member 5 is installed in the center of the mixing member 5 with its bottom opening protruding outward, so that the liquid that has exceeded its upper edge flows down the inner surface in the form of a film.

In this state, powder 3 is introduced from above the mixing member 5 and mixed and dispersed in the liquid.

In this way, the surface area of the liquid can be increased, and the dispersion effect can be improved accordingly.
Since the liquid film is thin, if too much powder is supplied, it will adhere to the surface of the mixing member, which may actually reduce the mixing effect.

This invention was made in order to eliminate the above-mentioned drawbacks, and by using a cyclone type mixing tank, it is possible to create a mixing device for powder and liquid that has a large surface area (which can increase the supply amount). The purpose is to provide.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

Reference numeral 6 denotes a cyclone-shaped mixing tank with a bulging center and small diameter openings at both upper and lower ends, and is composed of an upper body 6a and a lower body 6b connected by a flange portion 11.

The flange portion 11 is fastened with bolts, for example, and is separable.

A liquid supply pipe 10 is installed in the upper part of the mixing tank 6 in a tangential direction.
are connected.

A guide plate 13 is attached to the outlet of the tank for urging the flow of the supplied liquid downward.

Further, a hood 12 is provided above the opening lower, and as shown in FIG. 3, a predetermined powder is supplied from a screw feeder 15 below the powder supply tank 14 in response to opening and closing of a valve 16.

The valve 16 is optionally driven, for example by a cylinder 16a.

Furthermore, a rotary vane 14a is provided inside the powder supply tank 14 to facilitate discharge of the powder, and is driven by a motor M at the bottom.

The reduced state of the powder can be visually observed from the outside using a powder level meter 14b.

On the other hand, an L-shaped liquid level detection tube 9 is connected to the side surface of the mixing tank 6 from above, into which a sensor electrode rod (not shown) is inserted.

This electrode detects, for example, a liquid level above a predetermined value, operates the cylinder 16, closes the valve 16, and generates a signal to stop the supply of powder and the supply of liquid.

Therefore, the liquid supplied from the combined liquid supply pipe 10 into the mixing tank 6 enters downward from the tangential direction, forms a cyclone-like thin flow as shown, and descends.

Therefore, the flow rate of the liquid is very high, the liquid surface is wide (and the layer thickness is sufficient).

In this state, when the powder 3 is introduced from above, it is reliably mixed and dispersed in the liquid by the above soot flow.

The mixed liquid is then discharged from the lower opening 8.

The mixed liquid is further stirred in the stirring storage tank to completely dissolve the powder and stored.

Such a powder-liquid dissolving device is ideal for adjusting a polymer flocculant solution to be added to sludge supplied to a dehydrator, for example, in a sludge treatment process at a sewage treatment plant.

However, it goes without saying that the invention is not limited to this.

As described above, according to the present invention, the mixing tank is shaped like a cyclone, and the lower opening is smaller than the upper opening, so that a wide-area thin flow can be formed in the tank by filling the lower opening.

Therefore, the following effects can be obtained.

(1) Even if a large amount of powder is supplied, it can be sufficiently mixed.

(2) Since the flow rate is fast, the powder does not become step-like, and the dispersion effect is high.

(3) Since the fluid layer can be made thicker, it will not adhere to the container.

(4) Since the lower opening is filled with the solvent liquid, the powder will not be directly discharged.

(5) If a guide plate is provided, an upward flow toward the chemical input port will not occur.

Therefore, it is possible to increase the flow velocity considerably.

(6) Providing a liquid level detector can prevent liquid from overflowing even if the lower opening is blocked.

(7) By making the dissolution tank divisible, internal inspection and cleaning become easier.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional powder-liquid mixing device;
The figure is a cross-sectional view of the main parts of a powder-liquid mixing device according to an embodiment of the present invention, and FIG. 3 is a front view showing the overall configuration of the embodiment. 3...Powder, 6...Mixing tank, 7.
...Top opening, 8...Bottom opening, 9...
...Liquid level detection tube, 10...Liquid supply pipe, 11
...Flange part, 13...Guide plate.

Claims (1)

[Scope of Claims] 1. A cyclone-type mixing tank having a bulging center and small-diameter openings at both ends of the upper and lower parts, a liquid supply pipe that supplies liquid from a tangential direction to the upper part of this mixing tank, and the above-mentioned liquid supply pipe. and a liquid level detection unit that detects the liquid level in the mixing tank and stops feeding the powder into the mixing tank when the liquid level rises above a predetermined value, A mixing device for powder and liquid, wherein the powder is mixed by a thin flow formed in the mixing tank and discharged from the lower opening. 2. The powder and liquid mixing device according to claim 1, wherein the mixing tank is configured to be divided into upper and lower halves.