JP2004210520A - Pneumatic transportation device for powder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic transportation device for powder capable of stably and constantly pressure feeding powder at high pressure, while effectively sealing reverse air flow for air transportation with a group of high-density powder compressed by its own centrifugal force by rotation of a feeding disk. <P>SOLUTION: The feeding disk 2 with a larger diameter than a discharge port 10a is rotatably provided on the lower end of the discharge port 10a of a small-sized hopper 10. A plurality of powder flow passages 2e inside the feeding disk 2 bending from the central part of the feeding disk 2 to the outer periphery with a larger diameter to the lower central side are radially formed. The part of the feeding disk 2 outside of the hopper 10 is sealed by a casing 5 having an introduction port 5a and a discharging port 5b opposingly provided, and a motor 4 is provided for turning the feeding disk 2 from the introduction port 5a in the direction of the discharging port 5b side of the casing 5. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a powder pneumatic transport apparatus that transports powder by a high-speed air flow, and more particularly to a technique that enables continuous high-pressure feeding while reliably sealing a backflow gas.
[0002]
[Prior art]
2. Description of the Related Art Conventional powder transporting apparatuses generally use a method of pumping powder using a gas such as air flowing at high speed, and there are a low-pressure pumping type and a high-pressure pumping type. The low-pressure pumping system is a device that cuts out powder from a silo and injects it into an air transport pipe. 1) Powder that seals backflowing gas only when the air-feeding pressure is low by only the airflow resistance of the powder layer in the silo. Sealing method, 2) Ejector method in which the speed of the powder injection section is set to 100 m / s or more to reduce the backflow pressure (static pressure) of the injection section, 3) The silo has a closed structure, and the air transport pipe and the upper space of the silo are evenly spaced. And a pressure equalizing method for preventing a pressure difference between the inside and outside of the powder charging section from being generated.
[0003]
There are various types of high-pressure pumping systems, but the basic function is to block the backflow gas by operating the inlet and outlet valves of the pumping tank to receive powder and charge the air transport pipe. Since a high pressure of about 5 MPa or less is used for the pneumatic feeding pressure, all the pressure feeding units are of a batch type, and a method of combining two sets of the pressure feeding units for continuous transportation is generally adopted.
[0004]
By the way, in the former low-pressure pumping method, it is difficult to completely shut off the backflow gas because the pumping pressure condition is low, and there is a problem that stable quantitative supply performance cannot be obtained depending on the pressure condition. Also, in the latter high-pressure pumping method, it is necessary to frequently switch powder and air valves, so that the apparatus becomes complicated and expensive, and because it is a batch transport method, it is not suitable for continuous quantitative pumping. There was a problem.
[0005]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to solve these conventional problems, and to increase the flow resistance by increasing the density of the powder in the powder flow path by centrifugal force due to the high-speed rotation of the supply board, thereby increasing the flow resistance. And the function of efficiently transferring powder from the low-pressure side to the high-pressure air transport pipe side by utilizing the difference in centrifugal force applied to the powder in the inlet and outlet flow paths of the supply board. It is an object of the present invention to provide a pneumatic powder transport apparatus which has excellent sealing properties of a backflow gas and can stably perform continuous high-pressure pumping.
[0006]
[Means for Solving the Problems]
The configuration of the present invention that has solved such a problem includes:
1) A casing is provided below the discharge port of the powder storage chamber so as to hermetically close the casing. An inlet and an outlet of an air transport pipe are provided in the casing to transport the powder discharged by the airflow passing through the casing. In the pneumatic powder transport device, a supply plate having a powder flow path for supplying powder discharged to a lower space of the casing at a lower end of a discharge port protruding into the casing is rotatably inserted. The supply board is expanded from the discharge port, and the powder flow path is bent toward the lower center side over the outer circumference expanded from the discharge port, and rotation driving means for rotating the supply board is provided. The feature is that the inflow of air can be cut off by increasing the density of the powder in the powder flow path in the enlarged diameter section by its own centrifugal force by rotation and increasing the ventilation resistance to the pressure on the discharge port side. Pneumatic transport device for powder 2) The pneumatic powder transport device according to 1), wherein the plurality of long paths are formed radially from the center of the supply board. 3) The powder flow path is formed over the entire circumference of the supply board. The pneumatic transport device for powder according to 1), wherein the powder flow path is formed by arranging a plurality of partitions radially from a center of the supply board and dividing the powder into a plurality of fans. Pneumatic transport device 5) The casing has a substantially circular shape, and an inlet and an outlet of an air transport pipe are provided at the other end opposite to one end, and the introduced air flows from the inlet along the inner periphery of the casing. The powder air according to any one of 1) to 4) above, wherein the supply board is rotated in a direction in which the powder flows in a substantially U-turn shape to the outlet, so that the powder can be transported smoothly without disturbing the air flow. In the transport equipment.
[0007]
[Action]
According to the present invention, the powder in the powder flow path of the enlarged diameter portion is compressed at a high density by its own centrifugal force by the high-speed rotation of the supply plate, and the pressure of the compressed powder group on the discharge port side is increased. The air that is about to flow backward is sealed by increasing the ventilation resistance to the air. In addition, at this time, by utilizing the difference in centrifugal force applied to the powder present in the upper flow path and the lower flow path of the supply board, the powder is smoothly and continuously transferred from the low pressure side to the high pressure air transport pipe side. Will be sent to
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
As the powder flow path of the present invention, a plurality of narrow paths are formed radially from the center of the supply board, or those formed over the entire circumference of the supply board, or a plurality of partitions are formed at the center of the supply board. There are, for example, those provided radially from the section and divided into a plurality of fan shapes, and are arbitrarily selected according to the type of powder to be fed and the amount and speed of feeding.
[0009]
The inlet and outlet of the air transport pipe provided in the casing are formed by forming the casing into a substantially circular shape and providing an inlet and an outlet at the other end opposite to one end of the casing. It is preferable that the produced air be flowed in a U-turn shape along the inner circumference so that the air can be discharged from the outlet in the flow direction as it is because the powder can be smoothly transported without generating turbulent air flow. Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
[0010]
【Example】
The embodiment shown in FIGS. 1 to 6 is an example in which the present invention is applied to a powder high-pressure continuous pumping facility. FIG. 1 is a schematic diagram of a powder high-pressure continuous pumping apparatus of an embodiment, FIG. 2 is an explanatory view of a pneumatic transport apparatus of the embodiment, FIG. 3 is a plan view of the pneumatic transport apparatus of the embodiment, and FIG. A sectional view, FIG. 5 is a bottom view of the supply board of the embodiment, and FIG. 6 is an explanatory view showing a seal made of powder of the embodiment.
[0011]
In the drawing, 1 is a guide path, 2 is a supply board, 2a is a powder flow path, 2b is an opening, 2c is a folded portion, 3 is a rotating shaft, 4 is a motor, 4a is an output shaft, 5 is a casing, and 5a is an introduction. Port, 5b is an outlet, 6 is a pressure gauge, 10 is a small hopper, 10a is a discharge port, 11 is a maintenance gate, 12 is a blower, 12a and 13 are air transport pipes, 14 is a silo, 14a is a dust collector, and 15 is a fixed amount. The feeder, F is a pneumatic transport device, and S is powder.
[0012]
As shown in FIGS. 2 to 5, the pneumatic transport device F of the present embodiment has a supply board whose diameter is enlarged at the lower end of the guide path 1 having the same diameter as the discharge port 10a attached to the lower end of the discharge port 10a of the small hopper 10 serving as the pressure feeder. 2 are rotatably inserted, and a plurality of powder flow paths 2a are formed radially in the supply plate 2 and bent downward toward the center over the outer periphery whose diameter is enlarged from the central portion. The shaft 3 is attached to the output shaft 4a of the motor 4 and connected to the output shaft 4a. A substantially circular casing 5 having an inlet 5a for the air transport pipe on one side and an outlet 5b on the other side is provided from the lower end of the guide path 1. The rotary shaft 3 including the supply board 2 is sealed.
[0013]
As shown in FIG. 1, the pneumatic transport device F is attached to the lower end of the discharge port 10 a of the small hopper 10 serving as a pressure feed source, and the blower 12 is provided at the inlet port 5 a of the casing 5 via an air transport pipe 12 a. A pneumatic transport pipe 13 is connected to the delivery silo 14 at the outlet 5b, and a known quantitative feeder 15 is attached to the lower end of the discharge port of the silo 14.
[0014]
In the present embodiment, the blower 12 and the motor 4 are operated to take in air from the inlet 5a into the casing 5 and rotate the supply plate 2 at a high speed in a direction along the flow of the taken-in air. It turns and discharges from the outlet 5b which opposes, and flows to the silo 14 by the air transport pipe 13.
[0015]
When the powder S stored in the small hopper 10 is discharged to the guide path 1, the powder S is taken downward from the upper opening of the supply board 2 by the negative pressure of the air discharged from the outlet 5 b through the casing 5. The powder S is supplied to the opening 2b while bending the plurality of powder passages 2a at the folded portion 2c, discharged from the outlet 5b together with air, and sent to the silo 14 by the air transport pipe 13 under pressure.
[0016]
Here, when the air taken into the casing 5 is at a high pressure, the powder S is not smoothly fed by the air without flowing out from the outlet 5b smoothly but partly flowing toward the discharge port 10a (backflow). Quantitative supply may be difficult.
[0017]
However, in the present embodiment, the powder S in the folded portion 2c is compressed at a high density by its own centrifugal force due to the high-speed rotation of the supply board 2, and the compressed powder S group tends to flow backward by increasing the ventilation resistance. Air to be surely sealed. At this time, by utilizing the difference in centrifugal force applied to the powder S existing in the upper flow path and the lower flow path of the supply board 2, the powder S moves from the low pressure side to the high pressure air transport pipe 13 side. Efficient and continuous feeding.
[0018]
7 and 8 show another example of the powder flow path of the supply board of the embodiment. FIG. 7 is a plan view of a supply board according to another example of the embodiment, and FIG. 8 is an explanatory diagram illustrating a powder seal of another example of the embodiment. In the figure, 2d is a disk and 2e is a mounting piece. In another example of the embodiment, as shown in FIGS. 7 and 8, the supply plate 2 and the disk 2d are fixed at four places with small attachment pieces 2e so that the powder S flows over the entire circumference. The flow path 2a is formed. In addition, reference numerals and configurations are the same as those of the embodiment.
[0019]
9 and 10 show other examples of the powder flow path of the supply board of the embodiment. FIG. 9 is a plan view of a supply board according to another example of the embodiment, and FIG. 10 is a top cutaway plan view of a pneumatic transport apparatus using the supply board showing a seal made of powder of another example of the embodiment. In the figure, 2f is a partition. In another example of the embodiment, as shown in FIGS. 9 and 10, a plurality of partitions 2f are provided radially from a central portion to form a fan-shaped powder flow path 2a divided into a plurality. In addition, reference numerals and configurations are the same as those of the embodiment.
[0020]
11 and 12 show other application examples of the pneumatic powder transport device of the embodiment. FIG. 11 is a schematic diagram of a high-pressure continuous high-pressure continuous pumping equipment for powder in another example of the embodiment, and FIG. 12 is a schematic diagram of a high-pressure continuous incineration fly ash high-pressure pump equipment of another example of the embodiment. In the figure, 16 is a tank truck, 17 is a dust collector for incineration fly ash, 18 is a screw conveyor, and 19 is a rotary valve.
[0021]
The powder high-pressure continuous quantitative pumping equipment shown in FIG. 11 transports slaked lime and activated carbon transported by a tank truck 16 and stored in the hopper 10 of the pumping source to the incinerator fly ash dust collector 17 using the pneumatic transport device F of the embodiment. It is designed to enable constant-pressure feeding. The incineration fly ash high-pressure continuous pumping equipment shown in FIG. 12 can continuously pressure-feed the fly ash collected from the incinerator fly ash dust collector 17 and discharged by the screw conveyor 18 to the silo 14 using the pneumatic transport device F of the embodiment. It is like that. In each case, as in the embodiment, the powder S can be smoothly fed at a high pressure and a constant pressure without the air from the blower 12 flowing backward. In addition, reference numerals and configurations are the same as those of the embodiment.
[0022]
【The invention's effect】
As described above, according to the present invention, the backflow of air for air feeding is continuously and stably sealed while effectively sealing the backflow of air for air conveyance with the high-density powder group compressed by its own centrifugal force by the rotation of the supply plate. It is possible to provide a pneumatic transportation device for powder that can be supplied at high pressure and constant pressure.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a powder high-pressure continuous pumping facility of an embodiment.
FIG. 2 is an explanatory diagram of a pneumatic transportation device according to an embodiment.
FIG. 3 is a plan view of the pneumatic transportation device of the embodiment.
FIG. 4 is a sectional view taken along line AA of FIG. 2;
FIG. 5 is a bottom view of the supply board of the embodiment.
FIG. 6 is an explanatory view showing a seal made of powder according to the embodiment.
FIG. 7 is a plan view of a supply board according to another example of the embodiment.
FIG. 8 is an explanatory view showing a seal made of powder according to another example of the embodiment.
FIG. 9 is a plan view of a supply board according to another example of the embodiment.
FIG. 10 is a top cutaway plan view of a pneumatic transportation device using a supply board according to another example of the embodiment.
FIG. 11 is a schematic diagram of a powder high-pressure continuous constant-quantity pumping facility according to another example of the embodiment.
FIG. 12 is a schematic diagram of a high pressure continuous incineration fly ash pumping facility of another example of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Guide path 2 Supply board 2a Powder flow path 2b Opening 2c Folding part 2d Disk 2e Mounting piece 2f Partition 3 Rotary shaft 4 Motor 4a Output shaft 5 Casing 5a Inlet 5b Outlet 6 Pressure gauge 10 Small hopper 10a Discharge port 11 Maintenance gate 12 Blowers 12a, 13 Air transport pipe 14 Silo 14a Dust collector 15 Quantitative feeder 16 Tank truck 17 Dust collector for incineration fly ash 18 Screw conveyor 19 Rotary valve F Pneumatic transport device S Powder

Claims (5)

Provided so as to hermetically seal the casing below the discharge port of the powder storage chamber, and provided the inlet and outlet of the air transport pipe in the casing so that the powder discharged by the air flow passing through the casing can be transported. In the powder pneumatic transport device, a supply plate provided with a powder flow path for supplying powder discharged to a lower end of a discharge port protruding into the casing into a lower space of the casing is rotatably fitted, and The supply board is expanded from the discharge port, and the powder flow path is bent toward the lower center side over the outer circumference expanded from the discharge port, and rotation driving means for rotating the supply board is provided. Powder characterized in that the powder in the powder flow path in the enlarged diameter portion is made dense by its own centrifugal force to increase the airflow resistance to the pressure on the discharge port side, so that the inflow of air can be blocked. Pneumatic transport equipment. 2. The pneumatic powder transport device according to claim 1, wherein the powder flow path has a plurality of narrow paths formed radially from the center of the supply board. 2. The pneumatic powder transport device according to claim 1, wherein the powder flow path is formed over the entire circumference of the supply board. 2. The powder pneumatic transport device according to claim 1, wherein the powder flow path is formed by arranging a plurality of partitions radially from a central portion of the supply board and dividing the plurality of partitions into a plurality of fans. The casing has a substantially circular shape, and the inlet and outlet of the air transport pipe are provided at the other end opposite to the one end, and the introduced air flows from the inlet to the outlet along the inner periphery of the casing. The pneumatic powder transport apparatus according to any one of claims 1 to 4, wherein the supply board is rotated in a U-turn direction so that the powder can be transported smoothly without disturbing the air flow.

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