JPH0739739A - Ash mixer - Google Patents

Abstract

PURPOSE:To provide an ash mixer wherein diffusion of ashes and dust is reduced and mixing efficiency is increased and solidification and adhesion of ashes are not caused. CONSTITUTION:The upper part is formed into a cylindrical shape so as to receive falling ashes 7. The lower part has both a funnelform outer shell 2 connected to a discharge pipe 6 and an upper end opening 3a which is opened in a trumpetlike shape from the upper end of the outer shell 2 to the prescribed position of the lower part. The lower end opening 3d is so formed that the prescribed clearance 5 is interposed between the external circumferential surface thereof and the internal circumferential surface of the lower end part of the outer shell 2. A water supply nozzle 4 is provided to the outer shell 2 so as to inject water in the horizontal direction of a tangent line in the height position near to the upper end part of a funnelform inner shell 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention is for treating ash discharged from a boiler, which uses pulverized coal or a mixture of pulverized coal and heavy oil as fuel, in water in a thermal power plant or the like to form a slurry and process it. The present invention relates to an ash mixing device.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional ash mixer. Figure 2
In the apparatus shown in (A), the ash 7 in the hopper 21 is dropped from the discharge port 22 into the water in the water tank 23, stirred by the stirrer 24 to mix the ash with water to form a slurry, and the treated by a transport pipe or the like not shown. Send to the place. In the apparatus shown in FIG. 2 (B), the ash 7 in the hopper 21 is put into the vibration mixer 25 through the discharge port 22 and water 27 is added while vibrating, and the humidified ash 28 is loaded on the truck 26 and sent to the treatment plant. .

[0003]

Although the conventional ash mixing apparatus is as described above, in the apparatus shown in FIG. 2 (A), when the ash 7 is dropped from the discharge port 22 into the water tank 23, dust of the ash 7 is generated. Is scattered in the air, drifts and diffuses, which is a problem for hygiene and the environment. Moreover, a defective mixing portion is likely to be formed in a corner of the water tank 23. The apparatus shown in FIG. 2B has a problem that the equipment and operation cost of the vibration mixer 25 are high and the humidified ash 28 is transported by the truck 26, so that the transportation efficiency is poor.

The present invention has been made in order to solve the above problems, and has a simple structure, high mixing efficiency, little diffusion of ash dust, slurries and highly efficient transportation by a transportation pipe. The purpose is to obtain a mixing device.

[0005]

In the ash mixing apparatus according to the present invention, an upper part is formed in a cylindrical shape so as to receive falling ash, and a lower end discharge port has a funnel-shaped outer shell connected to a discharge pipe. It has a trumpet-shaped upper end opening at a predetermined position below the upper end of the outer shell, and the lower end opening is formed so that a predetermined gap is interposed between the outer peripheral surface and the inner peripheral surface of the lower end portion of the outer shell. And a water supply nozzle provided so that water is incident on the outer shell in a tangential horizontal direction at a height position near the upper end of the inner shell.

[0006]

When water is injected from the water supply nozzle of the ash mixing device according to the present invention into the outer shell, the water supply nozzle is provided tangentially to the outer shell, so that the water flows down while swirling in the outer shell to form a funnel shape. Flows into the discharge pipe through the gap between the lower end of the outer shell and the lower opening of the inner shell. If the amount of water supplied is larger than the amount of water flowing out from this gap, the water level of the swirling flow rises, flows into the inner shell beyond the upper opening of the inner shell that opens like a trumpet, and swirls along the inner wall of the inner shell. While flowing down, it flows out to the discharge pipe through the lower opening of the inner shell. If the ash is dropped into the ash mixing device in this state, the ash is entrained by the swirling flow to be mixed, and the ash flows out as a slurry. The water that is mixing ash in this ash mixing device is a swirling flow, and the flow velocity is high with respect to the inner wall surface of the outer and inner hulls. It does not cause the phenomenon such as solidification and adherence or residual of high concentration area of poor mixing. In addition, since the swirling flow flows as a large vortex along the inner wall of the inner hull, the center line becomes a low pressure, and the air containing ash dust on this ash mixing device is sucked down and flows down, and the ash dust is diffused. To be prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1A is a side sectional view and FIG. 1B is a plan view. In FIG. 1, 2 is an outer shell, 3 is an inner shell, and 4 is a water supply nozzle. As shown in FIG. 1, the outer shell 2 has a funnel shape, a position of an upper end opening 2a of the outer shell 2 is provided so as to approach an ash dropping point (not shown), and the upper portion of the outer shell 2 holds the falling ash 7 as much as possible. In order to receive it without scattering to the outside, it is formed in a cylindrical shape with a required diameter and as deep as possible. The funnel-shaped lower end opening 2d of the outer shell 2 is connected to a discharge pipe 6, and the discharge pipe 6 is connected to a transport pipe laid to a treatment site (not shown), and transports ash slurry produced by this ash mixing device (not shown). It is provided to be transported by a pump or the like.

As shown in FIG. 1, the inner shell 3 is formed in a funnel shape smaller than the outer shell 2, and is provided inside the outer shell 2 with the same axis, and the upper end of the inner shell 3 is opened like a trumpet. The upper end opening 3a, which is formed in a tucked shape with a considerable distance from the inner peripheral surface of the outer shell 2 and opens like a trumpet, prevents the ash 7 from scattering as much as possible. It is formed so as to be located considerably below the opening 2a. The lower end opening 3d of the inner shell 3 is the lower end opening 2 of the outer shell 2.
The opening is at the same height as d, and the lower end opening 2 of the outer shell 2
The diameter is slightly smaller than d, and the lower end opening 2 of the outer shell 2 is formed.
An outflow gap 5 is formed between the inner peripheral surface of d and the outer peripheral surface of the lower end opening 3d of the inner shell 3. The outflow gap 5 is a narrow gap to the extent that the ash slurry is never clogged.

As shown in FIG. 1, the water supply nozzle 4 has an outer shell 2
It is attached so as to penetrate in the horizontal tangential direction on the peripheral surface of
The height position of the water supply nozzle 4 is near or slightly below the upper end opening 3a of the inner shell 3. The water supply nozzle 4 is connected to a discharge port of a water supply pump or the like (not shown), and the diameter of the water supply nozzle 4 is determined so that a required amount of water supply can be obtained. The diameter of the injection port 4t into the outer shell 2 of the water supply nozzle 4 may be gradually reduced, if necessary, to increase the water ejection speed.

Next, the operation of the embodiment shown in FIG. 1 will be described. Water is sent from a water supply pump (not shown), and the water is ejected from the injection port 4t into the outer shell 2 through the water supply nozzle 4.
Since the injection port 4t of the water supply nozzle 4 ejects water in the horizontal tangential direction of the outer periphery of the outer shell 2, no special swirling stirring device or the like is required, and the water swirls in the outer shell 2 as indicated by the arrow. Form a large vortex. While swirling, the water flows down in the outer shell 2, passes through the outflow gap 5, and falls. When the amount of water supplied from the injection port 4t into the outer shell 2 is larger than the amount of water passing through the outflow gap 5, the water level in the outer shell 2 rises, and the edge of the upper end opening 3a of the inner shell 3 as shown in the figure. Over the inner wall of the inner shell 3 and smoothly flows into the inner shell 3 along the smooth curved surface of the inner shell 3 which opens like a trumpet. The water flowing into the inner shell 3 naturally becomes a swirling flow as indicated by an arrow due to the inertia of the swirling flow.

Normally, as shown in FIG. 1, the ash 7 is dropped from above while water is flowing into the inner shell 3. The falling ash 7 falls into the space surrounded by the cylindrical portion in the upper part of the outer shell 2 and therefore reaches the water surface in the outer shell 2 or the inner shell 3 without being scattered so much. The ash 7 that has fallen to the water surface is caught in the swirling water in the outer shell 2 or the inner shell 3 and mixed by the swirling water while flowing down in the outer shell 2 or the inner shell 3. The distribution of the falling ash 7 is large in the central portion, and because it is caught in the swirling flow and flows into the inner shell 3, the ash concentration in the inner shell 3 is relatively high. The ash is entrained in the swirling water and flows down while mixing, becoming ash slurry, and flows out from the lower end opening 3d of the inner shell 3 or the outflow gap 5 to the discharge pipe 6. Further, since the water in the inner shell 3 swirls and flows down as a vortex, the pressure near the center line becomes low, and the water flowing as an inverted conical water surface sucks in the air near the center line as shown in the figure. Run down. By sucking the air, the ash floating on the water surface in the upper portion of the outer shell 2 of the ash mixing device is also sucked into the flowing water. As a result, the amount of ash dust diffused from the ash mixing device to the outside is reduced.

As described above, the swirling water flows down with a large horizontal partial velocity due to the swirl while contacting the inner surfaces of the outer shell 2 and the inner shell 3, so that even if ash tries to adhere to the inner surface of the outer shell 2 or the inner shell 3, , It has the ability to peel it off, and there is no high concentration area of poor mixing in water, and there is no dry and wet coexistence area that causes ash solidification and adhesion. Further, since the ash concentration of the slurry flowing outside the inner shell 3 is lower than the concentration in the inner shell 3, the flow discharged from the outflow gap 5 becomes a jet flow, which is high near the outflow gap 5 and on the inner surface of the discharge pipe 6. Since the ash slurry having a high concentration is not allowed to adhere and the inner surface of the pipe is maintained in a clean state, the ash slurry can be transported smoothly.

Although only one water supply nozzle 4 is provided in FIG. 1, for example, in FIG. 1 (B), the water supply nozzle 4 is sprayed from left to right on the lower side of the outer circumference of the outer shell 2 in the figure.
It is also possible to provide a swirl flow more strongly in the counterclockwise direction together with the upper water supply nozzle 4.

[0014]

As described above, according to the present invention, a swirling flow is generated in the outer and inner shells by the incident water in the tangential direction of the water supply nozzle. High mixing ability is exhibited without any residue. Also, due to the intake of air on the centerline of the swirling flow,
The diffusion of ash floating in the air is prevented.

[Brief description of drawings]

FIG. 1 shows an ash mixing device according to an embodiment of the present invention,
(A) is a side sectional view and (B) is a plan view.

FIG. 2 shows a conventional ash mixing means, (A) is a side sectional view of a stirrer type, and (B) is a side sectional view of a vibration mixer type.

[Explanation of symbols]

2: outer shell, 2a: upper opening, 2d: lower opening,
3: inner contour, 3a: upper opening, 3d: lower opening,
4: Water supply nozzle, 4t: Injection port, 5: Outflow gap,
6: Discharge pipe, 7: Ash.

Front page continuation (72) Inventor Kenichi Katayama 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe Sanryo Heavy Industries Ltd. Kobe Shipyard

Claims (1)

[Claims] 1. An upper part is formed in a cylindrical shape so as to receive falling ash, and a lower end discharge port has a funnel-shaped outer shell connected to a discharge pipe and a trumpet-shaped opening at a predetermined position below the upper end of the outer shell. Has an upper end opening, and the lower end opening has a funnel-shaped inner shell formed so that a predetermined gap is present between the outer peripheral surface and the inner peripheral surface of the lower end of the outer shell, and the upper end of this inner shell. An ash mixing device, comprising: a water supply nozzle provided so that water is incident on the outer shell in a tangential horizontal direction at a height position near the portion.