JP4295993B2 - Powder pneumatic transport equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a powder pneumatic transport apparatus that transports powder with a high-speed air flow, and more particularly to a technology that enables continuous high-pressure pumping while reliably sealing a backflow gas.
[0002]
[Prior art]
Conventional powder transport 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 method and a high pressure pumping method. The low pressure pumping type 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 with the airflow resistance of the powder layer in the silo when the air transport pressure is low Sealing method, 2) Ejector method that lowers the backflow pressure (static pressure) of the injection part by increasing the speed of the powder injection part to 100 m / s or more, 3) The silo is sealed and the air transport pipe and the silo upper space are leveled. There is a pressure equalization method in which the internal and external differential pressure is not generated in the powder charge portion.
[0003]
There are various types of high-pressure pumping methods, but the basic function is to shut off the backflow gas by operating the inlet and outlet valves of the pumping tank to receive powder and charge the pneumatic transport pipe , delivery unit from using the following high pressure air feed pressure of about 0.5MPa are all batch, the delivery unit 2 sets combining method is generally employed for the continuous transport.
[0004]
By the way, in the former low-pressure pumping type, since the pumping pressure condition is low, it is difficult to completely block the backflow gas, and there is a problem that a stable quantitative supply performance cannot be obtained depending on the pressure condition. In addition, the latter high-pressure pumping type requires frequent switching of the powder and air valves, making the device complicated and expensive, and is not suitable for continuous quantitative pumping because it is a batch transport system. 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 air flow resistance by increasing the powder density in the powder flow path by centrifugal force due to the high-speed rotation of the supply board, thereby increasing the flow resistance. A function to efficiently transfer powder from the low-pressure side to the high-pressure pneumatic transport pipe side by utilizing the centrifugal force difference applied to the powder in the inlet-side outlet-side flow path of the supply panel It is an object of the present invention to provide a powder pneumatic transport apparatus that has excellent backflow gas sealing properties and can stably perform continuous high-pressure pumping.
[0006]
[Means for Solving the Problems]
The configuration of the present invention that solves this problem is as follows.
1) Provided to seal the casing below the discharge port of the powder storage chamber, and provided the inlet and outlet ports of the air transport pipe in the casing, respectively, to transport the powder discharged by the air flow passing through the inside of the casing In a pneumatic transportation apparatus for powder, a supply board having a powder flow path for supplying powder discharged to the lower end of the discharge port protruding into the casing to a lower space of the casing is rotatably inserted. The supply plate is expanded from the discharge port, the powder flow path is bent to the lower center side over the outer periphery expanded from the discharge port, and a rotation drive means for rotating the supply plate is provided. It is characterized in that the inflow of air can be blocked by increasing the air flow resistance against the pressure on the discharge port side by increasing the density of the powder in the powder flow path of the expanded diameter portion by its centrifugal force by rotation. Powder air transport device 2) 1) The powder pneumatic transport device according to 1), wherein a 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 powder pneumatic transport apparatus 4) according to 1), wherein the powder flow path is a plurality of partitions provided radially from the center of the supply board and partitioned into a plurality of fans. Pneumatic transport device 5) The casing has a substantially circular shape and is provided with an inlet and outlet for the air transport pipe at the other end opposite to the one end, and the introduced air runs along the inner periphery of the casing from the inlet. The powder air according to any one of 1) to 4) above, wherein the powder is smoothly transported by rotating the supply board in the direction of flowing in a substantially U-turn shape to the outlet so as not to disturb the air flow. In the transport equipment.
[0007]
[Action]
According to the present invention, the powder contained in the powder flow path of the enlarged diameter portion by high-speed rotation of the supply board is compressed with high density by its own centrifugal force, and the pressure on the discharge port side in the compressed powder group. By increasing the airflow resistance against air, the air that tries to flow backward is sealed. At this time, by utilizing the difference in centrifugal force applied to the powder existing 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]
DETAILED DESCRIPTION OF THE INVENTION
As the powder flow path of the present invention, a plurality of elongated passages are formed radially from the center of the supply board, or formed over the entire circumference of the supply board, or a plurality of partitions are provided at the center of the supply board. There are some which are provided radially from the section and divided into a plurality of sectors, and are arbitrarily selected according to the type, amount and speed of powder to be air-fed.
[0009]
The inlet and outlet of the air transport pipe provided in the casing are formed in a substantially circular shape, and the inlet and outlet are respectively provided at the other end opposite to the one end. It is preferable that the air that has been made to flow in a U-turn shape along the inner periphery and be discharged from the outlet port without changing the flow direction can smoothly transport the powder without causing air turbulence. Embodiments of the present invention will be specifically described below 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 facility of the embodiment, FIG. 2 is an explanatory diagram of the pneumatic transport device of the embodiment, FIG. 3 is a plan view of the pneumatic transport device 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 sealing with powder of the embodiment.
[0011]
In the figure, 1 is a guide path, 2 is a supply board, 2a is a powder flow path, 2b is an opening, 2c is a turning portion, 3 is a rotating shaft, 4 is a motor, 4a is an output shaft, 5 is a casing, and 5a is introduced. Mouth, 5b is outlet, 6 is pressure gauge, 10 is small hopper, 10a is discharge port, 11 is maintenance gate, 12 is blower, 12a and 13 are air transport pipes, 14 is silo, 14a is dust collector, 15 is fixed amount A feeder, F is an air transport device, and S is powder.
[0012]
As shown in FIGS. 2 to 5, the pneumatic transport device F of the present embodiment is a supply board having an enlarged diameter at the lower end of the guide passage 1 having the same diameter as that of the discharge port 10 a attached to the lower end of the discharge port 10 a of the small hopper 10 as a pressure source. 2 is rotatably inserted, and a plurality of powder flow passages 2a bent radially downward are formed on the supply board 2 over the outer periphery whose diameter has been expanded from the center, and rotated on the lower surface of the supply board 2 A shaft 3 is attached and connected to the output shaft 4a of the motor 4, and a substantially circular casing 5 provided with an inlet 5a of the air transport pipe on one side and an outlet 5b on the opposite side from the lower end of the guide path 1. The rotating shaft 3 including the supply board 2 is hermetically sealed.
[0013]
As shown in FIG. 1, this pneumatic transport device F is attached to the lower end of the discharge port 10a of the small hopper 10 that is the pressure source, and the blower 12 is provided at the introduction port 5a of the casing 5 via the pneumatic transport pipe 12a. An air transport pipe 13 is piped to a pressure-feed destination silo 14 at the outlet 5 b, and a known quantitative feeder 15 is attached to the lower end of the discharge port of the silo 14.
[0014]
In this embodiment, the blower 12 and the motor 4 are operated to take air from the introduction port 5a into the casing 5 and to rotate the supply board 2 at a high speed in the direction along the taken air flow. It turns and discharges from the opposite outlet 5 b and flows to the silo 14 through the pneumatic transport pipe 13.
[0015]
When the powder S stored in the small hopper 10 is discharged to the guide path 1, it is taken downward from the upper opening portion of the supply panel 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 turn-back portion 2c, discharged together with air from the outlet 5b, and pumped to the silo 14 through the air transport pipe 13.
[0016]
Here, when the air taken into the casing 5 has a high pressure, the powder S is not smoothly transported by air by being partially discharged to the discharge port 10a side (back flow) without being smoothly discharged from the outlet 5b. Fixed quantity supply may be difficult.
[0017]
However, in this embodiment, the powder S included in the folded portion 2c is compressed to a high density by its own centrifugal force by the high-speed rotation of the supply board 2, and the air flow resistance is increased by the compressed powder S group so as to flow backward. Make sure to seal the air. 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 pneumatic transport pipe 13 side. It is fed in efficiently and continuously.
[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 of another example of the embodiment, and FIG. 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 board 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. A flow path 2a is formed. Other reference numerals and configurations are the same as those in the embodiment.
[0019]
9 and 10 show another example of the powder flow path of the supply board of the embodiment. FIG. 9 is a plan view of a supply board of another example of the embodiment, and FIG. 10 is a plan view of a top surface of an air transportation device using the supply board showing a powder seal in 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 the central portion to form a fan-shaped powder flow path 2a that is divided into a plurality of sections. Other reference numerals and configurations are the same as those in the embodiment.
[0020]
FIGS. 11 and 12 show another application example of the powder pneumatic transport apparatus of the embodiment. FIG. 11 is a schematic diagram of a powder high-pressure continuous quantitative pumping equipment of another example of the embodiment, and FIG. 12 is a schematic diagram of an incineration fly ash high-pressure continuous pumping 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 uses slaked lime and activated carbon transported by a tank truck 16 and stored in the hopper 10 of the pumping source to the dust collector 17 for incineration fly ash using the air transport device F of the embodiment. It is designed to be able to deliver a fixed amount of pressure. The incineration fly ash high-pressure continuous pumping equipment shown in FIG. 12 is capable of continuously sending the fly ash collected from the dust collector 17 for incineration fly ash and discharged by the screw conveyor 18 to the silo 14 using the pneumatic transport device F of the embodiment. It is what I did. In any case, the powder S can be smoothly fed at high pressure and constant pressure without air flowing back from the blower 12 in the same manner as in the embodiment. Other reference numerals and configurations are the same as those in the embodiment.
[0022]
【The invention's effect】
As described above, according to the present invention, the powder is continuously and stably sealed while effectively sealing the backflow of air for air transport with the high-density powder group compressed by its centrifugal force by the rotation of the supply board. In addition, it is possible to provide an air transportation device for powder that can be fed at a constant high pressure.
[Brief description of the drawings]
FIG. 1 is a schematic view of a powder high-pressure continuous pumping equipment of an example.
FIG. 2 is an explanatory diagram of a pneumatic transport device according to an embodiment.
FIG. 3 is a plan view of the pneumatic transport device according to the embodiment.
4 is a cross-sectional view taken along the line AA in FIG.
FIG. 5 is a bottom view of the supply board of the embodiment.
FIG. 6 is an explanatory view showing sealing with powder of an example.
FIG. 7 is a plan view of a supply board of another example of the embodiment.
FIG. 8 is an explanatory view showing sealing with powder of another example of the embodiment.
FIG. 9 is a plan view of a supply board of another example of the embodiment.
FIG. 10 is a top cutaway plan view of an air transportation device using a supply board of another example of the embodiment.
FIG. 11 is a schematic view of a powder high-pressure continuous quantitative pumping equipment of another example of the embodiment.
FIG. 12 is a schematic diagram of incineration fly ash high-pressure continuous pumping equipment of another example of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Guide way 2 Supply board 2a Powder flow path 2b Opening 2c Folding part 2d Disk 2e Mounting piece 2f Partition 3 Rotating 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 Blower 12a, 13 Pneumatic transport pipe 14 Silo 14a Dust collector 15 Fixed amount 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 to seal the casing below the discharge port of the powder storage chamber, and to provide the inlet and outlet of the air transport pipe in the casing respectively, so that the powder discharged by the air flow passing through the casing can be transported In the powder pneumatic transport apparatus, a supply board provided with a powder flow path for supplying powder discharged to the lower end of the discharge port protruding into the casing to the lower space of the casing is rotatably inserted. The supply plate is expanded from the discharge port, and the powder flow path is bent to the lower center side over the outer periphery expanded from the discharge port, and a rotation drive means for rotating the supply plate is provided. A powder characterized in that the inflow of air can be blocked by increasing the air flow resistance against the pressure on the discharge port side by increasing the density of the powder in the powder flow path of the expanded diameter portion by its own centrifugal force Pneumatic transport equipment.   2. The powder pneumatic transport device according to claim 1, wherein the powder flow path is formed by forming a plurality of elongated paths radially from the center of the supply board.   2. The powder pneumatic 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 providing 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 an inlet port and an outlet port of the air transport pipe are respectively provided at the other side end portion opposite to the one side end portion, and the introduced air is approximately from the inlet port to the outlet port along the inner periphery of the casing. The powder pneumatic transport apparatus according to any one of claims 1 to 4, wherein the powder can be smoothly transported by rotating the supply board in a U-turn flow direction without disturbing the air flow.

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