JP2556339Y2 - Pneumatic transport equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic transportation device for powders and the like, and more particularly to a device for efficiently transporting powders such as fly ash and pulverized coal having a low bulk specific gravity and improving the transportation capacity. The present invention relates to a pneumatic transportation device.

[0002]

2. Description of the Related Art Conventionally, as a device for efficiently transporting a large amount of powder by air, a powder pipe provided with a ring pipe at a lower portion inside a transport tank and further provided with a powder delivery nozzle at a lower portion thereof. And ejecting air from the ring pipe to fluidize the powder downward and eject the air from the powder delivery nozzle to deliver the powder in the transport tank into the powder transport pipe. A pneumatic transportation device is used. In this pneumatic transport device, the transport capacity is adjusted by the air ratio between the nozzle of the ring pipe and the nozzle for delivering powder. This type of pneumatic transport apparatus is configured in a twin-hull configuration, for example, by arranging two transport tanks, and when one is in the process of transporting powder, the other alternately receives the powder so that the tank is alternately opened. By switching, the powder is continuously transported.

[0003]

However, when a pneumatic transport device that transports powder by air from a transport tank storing such powder is mounted on, for example, a tanker ship, the bulk specific gravity of the tanker ship differs. Various powders are loaded and pneumatically transported for unloading.However, when discharging and transporting powders with low bulk specific gravity, powders rise up in the transport tank by air supply only from the conventional ring pipe. As a result, there is a problem that the fluidized state of the powder downward is not constant, and it takes time for transportation and the unloading time becomes longer, that is, there is a problem that the transportation capacity is reduced.

[0004] Further, in such a pneumatic transport apparatus that pneumatically feeds powder from a transport tank storing powder, the transport tank has a capacity corresponding to the bulk specific gravity of the powder. There is also a problem that the capacity of the memory becomes large. As the capacity of the transport tank increases, the installation space and equipment costs increase. The capacity of the transport tank is expressed by the following equation. V (volume) = transport capacity (T / H) / [bulk specific gravity (T
/ M ³ ) × filling efficiency (η) × transport number per hour (number / H)] The present invention has been made in view of such a problem, and has a small bulk specific gravity such as fly ash and pulverized coal. It is an object of the present invention to provide a pneumatic transportation device capable of efficiently transporting even powders of the powder and improving the transportation capacity.

[0005]

In order to achieve the above object, the pneumatic transportation device of the present invention is provided with a ring pipe in a lower part of the inside of a transportation tank for storing powder, and furthermore, a powder delivery apparatus in a lower part thereof. A powder transport pipe provided with a nozzle for spraying air from the ring pipe to fluidize the powder and to eject air from the powder delivery nozzle to transfer the powder in the transport tank into the powder transport pipe. In the pneumatic transport device, the transport tank is placed above the ring pipe.
And, there is provided a powder pressure feeding nozzle in which an air ejection port is located facing the top space in the transport tank above the powder stored inside, and the powder pressure feeding nozzle is provided at the top portion.
In the space, is the position where the ejected air leans against the inner peripheral wall of the transport tank?
To the center of the transport tank directly
Position the air jet so that it is jetted in a horizontal direction
The configuration was provided .

[0006]

[0007]

With the above construction , the space inside the top space is
From the pressure feed nozzle located on the peripheral wall of the transport tank
If the pumping air goes directly to the approximate center of the transport tank,
The jets are blown almost right next to the top space of the transport tank.
Pressure acts evenly on Therefore, the powder stored in the inside is uniformly pressurized in the downward direction, and the disturbance of fluidization due to the air ejected from the ring pipe, such as the soaring phenomenon of the powder in the transport tank, is suppressed, and the downward direction is suppressed. The flow of the powder to the transfer tank is rectified, and the powder is smoothly sent out toward the powder transfer pipe at the lower part of the transfer tank. Thereby, the transportation capacity is improved. For this reason, even a powder having a small bulk specific gravity is smoothly sent out from the transport tank to the powder transport pipe. Further, when comparing devices having the same transport capacity, the volume of the transport tank can be reduced. And the compressed air
Almost directly in the center of the transport tank
The blown compressed air flows along the inner wall of the transport tank
Flow phenomenon is prevented as much as possible.
It is prevented as much as possible.

[0008]

[0009]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. 1 and 2 show an embodiment of the pneumatic transportation device according to the present invention. FIG. 1 is a longitudinal sectional view of a transportation tank.
FIG. 2 is a plan view taken along line II-II of FIG. 1. In the figure, a powder supply port 11 is provided at the center of the top of a transport tank 10, and a cone valve 12 which is opened at the time of receiving powder and closed at the time of powder transport is provided at the lower portion of the tank itself.
Is installed. A ring pipe 13 is attached to a lower portion of the transport tank 10, and a number of air outlets (not shown) are formed in the lower surface around the ring pipe 13 to fluidize the powder downward. Has been established. The lower transport tank 10 is formed with a cone and narrowed down, and the lowermost portion is provided with a powder transport pipe 15 for delivering powder from the transport tank 10.

[0010] A powder delivery nozzle 14 for further delivering powder directed downward by the air jetted from the ring pipe 13 into the powder transport pipe 15 is provided in the powder transport pipe 15.
Is installed. The upper pressurizing nozzle 20 constituting the main part of the present invention is attached to the upper peripheral portion of the transport tank 10 by joining the flange portion of the short pipe 10a and the flange portion. A plurality of (four in this embodiment) air jet ports 22 of the upper pressure-feeding nozzle 20 are provided in the vertical direction of the pipe wall of the base pipe 21 constituting the upper pressure-feeding nozzle 20. Is located so as to face the top space 16. The bottom of the base tube 21 is closed by a bottom lid 23 so that air does not flow in one direction directly below. Then, the air ejecting port 22 is 1, toward directly in the center of the injected air A transportation tank 10 as shown in FIG. 2, and are oriented so as to be ejected in a horizontal direction.

[0011] Compressed air supply pipes 31, 32, and 33 are connected to the ring pipe 13, the powder delivery nozzle 14, and the upper pressure delivery nozzle 20, respectively. These supply pipes 31, 32, 33 are branched from the main pipe 30. The supply pipe 31 connected to the ring pipe 13 is a main pipe 3
Automatic butterfly valve 31 branched from 0 and sequentially from the upstream side
a, a flow control valve 31b and a check valve 31c are interposed. A supply pipe 32 connected to the powder delivery nozzle 14 is branched from a point downstream of the automatic butterfly valve 31a of the supply pipe 31, and a flow control valve 32b and a check valve 32 are sequentially arranged from the upstream side.
c is interposed. An automatic butterfly valve 33a, a flow control valve 33b, and a check valve 33c are provided in the supply pipe 33 connected to the upper pressure feeding nozzle 20 in this order from the upstream side.

The operation of the pneumatic transportation device having such a configuration will be described. Prior to the start of transport, the cone valve 12 is opened and powder is supplied from the powder supply port 11 and stored in the transport tank 10. In this case, the powder is transported in tank 1
About 80 to 90% of the volume of 0 is filled. The upper surface of the powder is filled so as to be located slightly below the lower end of the upper pressure feeding nozzle 20. Then, after closing the cone valve 12, the automatic butterfly valves 31a, 33a interposed in the compressed air supply pipes 31, 33 are opened, and the compressed air is supplied to the ring pipe 13, the powder delivery nozzle 14, and the upper compressed nozzle 20. Supply. In addition, each compressed air supply pipe 31, 3
Flow control valves 31b, 32b, 33 interposed in 2, 33
b is set by adjusting the opening in advance.

Thus, the band-shaped air flow A is directly transmitted from the plurality of air jet ports 22 provided in the vertical direction of the upper pressurizing nozzle 20 attached to a position close to the inner peripheral wall at the upper part of the transport tank 10. Is ejected horizontally toward the vertical axis (center) of the tank 10 into the top space 16 of the tank 10 so that the powder stored in the transport tank 10 is evenly applied with pressure over the powder from above. Is pressurized, and air is ejected from the ring pipe 13 toward the center of the lower tank cone, so that the transport tank 1
The powder stored in 0 is fluidized. At the same time,
Pressurized air is supplied from the powder delivery nozzle 14 in the axial direction of the powder transport tube 15.

Accordingly, the ring pipe 13 is formed by the action of the air blown out from the air outlet 22 of the upper pressure feeding nozzle 20.
The occurrence of irregular fluidization such as soaring of the powder due to the air ejected from the air is suppressed, and the downward flow of the powder is rectified, so that the powder is smoothly sent to the powder transport pipe 15. You. That is, the transportation capacity is improved by improving the discharge efficiency. Since the bottom of the base tube 21 of the upper pressure feeding nozzle 20 is closed by the bottom cover 23 so that air does not flow in one direction directly below, the jet air directly hits the powder surface and the powder It does not disturb the flow state. Then, air is directly sent from the upper pressure feeding nozzle 20 to the center of the transport tank 10.
Since the air is ejected horizontally toward the contact, the generation of the air flow along the inner peripheral wall surface of the transport tank 10 is prevented as much as possible, so that the abrasion of the inner peripheral wall surface of the tank 10 due to the powder multiplied by the air flow is minimized. can do.

Powders having a low bulk specific gravity (bulk specific gravity γ = 1.0 or less), such as fly ash and pulverized coal, are liable to rise due to fluidization, but in the present invention, pressure is applied from above the stored powder. As a result, the soaring phenomenon is suppressed, so that it is particularly effective for transporting powder having such a small bulk specific gravity. In the above embodiment,
The ratio of the total amount of air supplied to the ring pipe 13 and the powder delivery nozzle 14 to the amount of air supplied to the upper pressure feeding nozzle 20 is 2
When the ratio is set to 8, the transport capacity of fly ash in the same tank capacity can be increased by 1.3 to 1.5 times.

In the above embodiment, the case where the direction of the air jet port 22 of the upper pressure feeding nozzle 20 is formed so that the jet air A is jetted toward the center of the transport tank 10 is shown.
As shown by the dotted lines in FIG. 2, directions in which the jetted air A ₁ and A ₂ do not flow along the inner peripheral wall of the tank 10 with respect to the center line as much as possible, for example, an angle of 30 to 45 °. Air spout 22a so as to be spouted at
22b may be provided. Of course, the jet air A and the jet air A
_1, the air ejection opening 22,22a in three places when viewed from the top as _{A 2} is generated, it is also possible features an 22b.

Although the direction in which the air is ejected is set as described above so as to minimize the abrasion of the wall of the transport tank 10 due to the powder, the present invention proposes the air ejection ports 22, 22a. , 22b is not particularly limited as long as it can press the powder from above without disturbing the downward flow of the powder as much as possible. .

[0018]

As is apparent from the above description, in the present invention , pressure is applied evenly to the top space of the transport tank.
So that the powder stored inside the transport tank
Is pressed down uniformly and air is
Do not directly hit the body surface and disturb the flow state of the powder
Since there is no flow, it is possible to suppress the disturbance of fluidization such as soaring of powder due to air fluidization in the transport tank and regulate the flow toward the bottom of the powder, and to reduce the powder at the bottom of the transport tank. toward the body transport pipe it can be made to discharged smoothly flow. Therefore, the transport capacity can be improved. In particular, powder such as fly ash having a low bulk specific gravity tends to be disturbed in the flow state due to fluidization by air, but the present invention can prevent such a phenomenon. And the top
The pumping air from the pumping nozzle in the subspace almost
Spouted horizontally directly toward the center, so
The compressed air flowing along the inner wall of the transport tank
Elephant can be prevented as much as possible, and the wall is worn by powder
Can be prevented as much as possible.

Even when powder having different bulk specific gravities is transported by the same transport device, the air ratio of the upper pressure feed nozzle, the lower ring pipe and the powder feed nozzle is adjusted according to the bulk specific gravity of the powder. By selecting the desired ratio, the downward flow state can be adjusted to efficiently discharge and send out the powder from the transport tank.For example, even when transporting powder having a low bulk specific gravity, transport can be performed in a short time. Can be done with Also, when comparing devices with the same transportation capacity,
The volume of the transport tank can be reduced.

[0020]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a transport tank constituting the pneumatic transport device of the present invention.

FIG. 2 is a plan view cut along line II-II of FIG.

[Explanation of symbols]

 Reference Signs List 10 transport tank 13 ring pipe 14 powder delivery nozzle 15 powder transport pipe 20 upper pressure feed nozzle 22 air outlet 22a, 22b air outlet 31, 32, 33 compressed air supply pipe

Claims (1)

(57) [Scope of request for utility model registration] 1. A ring pipe is provided in a lower portion of a transport tank for storing powder, and a powder transport tube is further provided with a powder delivery nozzle in a lower portion thereof, and air is ejected from the ring pipe. In the pneumatic transport device that fluidizes the powder and ejects air from a powder delivery nozzle to deliver the powder in the transport tank into the powder transport pipe, the transport tank includes, from the ring pipe, It is also a top, or
First, a powder pressure feeding nozzle is provided in which an air ejection port is positioned so as to face the top space in the transport tank above the powder stored therein, and the powder pressure feeding nozzle sprays in the top space.
From the position where the outflow air approaches the inner peripheral wall of the transport tank,
Jet directly toward the center of the
An air transport device characterized in that the air ejection port is located so as to be discharged .