JPH06293437A - Powder pressure feeding device - Google Patents

Abstract

PURPOSE:To provide a powder pressure feeding device to reduce an amount of gas used for conveyance of a powder material. CONSTITUTION:A powdery material fed through a powder transfer pipe 5 to the central part of a rotor 7 is fed under a high pressure by means of a centrifugal force through a plurality of passages 8 radially arranged in the rotor 7. A rotor peripheral direction passage arranged in the peripheral direction of the rotor 7 is connected to the terminal end of the passage 8 at the tip part of the rotor 7 and a radial passage to the terminal end of the rotor peripheral direction passage. High pressure gas from a high pressure fan 13 is guided to the rotor peripheral direction passage through a passage 16 in the rotor 7 and injected through a jet nozzle. The rotor peripheral direction passage causes facilitation of transfer of a powdery material by means of the jet nozzle by utilizing an inertia force generated through rotation of the rotor 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a coal gasification plant,
The present invention relates to a powder pressurizing and supplying device for supplying powder to a pressurized fluidized bed boiler, a blast furnace and other high pressure devices.

[0002]

2. Description of the Related Art As a powder pressurizing and feeding device, there is, for example, one shown in Japanese Patent Application No. 1-158341 filed by the present applicant. As shown in FIG. 4, the apparatus uses the centrifugal force of the rotor 7 to pass the powder supplied from the powder transfer pipe 5 to the center 6 of the rotor 7 through radial passages 8 radially provided inside the rotor 7. It is a device that delivers under high pressure.
The terminal end of the radial passage 8 is communicated with the radial passage 11 a at the outer peripheral portion of the rotor 7 via the rotary shaft passage 11. The rotating shaft direction passage 11 is provided parallel to the rotating shaft 25 of the rotor 7.

As described above, in the conventional powder pressurizing and feeding device, the passage through which the powder is transferred is partially directed toward the rotation axis 25 of the rotor 7, so that the powder is not lost even if the rotor 7 rotates. Is stopped in this rotating shaft direction passage 11. Therefore, in order to transfer this powder, a jet nozzle 12 is faced in the rotary shaft direction passage 11 as shown in the drawing, and the gas passage 1
The pressurized gas supplied through 8 is jetted as a jet to transfer the powder. However, a large amount of gas is required to transfer the suspended powder,
It is necessary to reduce the amount of transfer gas.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a powder pressurizing and supplying device which can reduce the amount of gas for transferring powder particles in a passage.
Another object of the present invention is to reduce the amount of gas for transferring powder in the powder pressurizing and supplying device with a simple structure.

[0005]

DISCLOSURE OF THE INVENTION According to the present invention, a powder applied to the center of a rotor is sent at a high pressure by a centrifugal force of the rotor through a plurality of passages radially provided inside the rotor. In order to solve the above problems in the pressure supply device, a structure is adopted in which a rotor circumferential passage is connected to the end of the radial passage and a radial passage is connected to the end of the rotor circumferential passage. If the circumferential passage has a certain angle in the outer circumferential direction, the powder can be easily discharged.

[0006]

In the powder pressurizing and feeding apparatus according to the present invention, since the circumferential passage is provided continuously at the end of the radial passage, the rotor is rotated in the direction of contact with the radial passage and the circumferential passage. When the powder is rotated in the direction toward, the inertial force due to the rotation is applied to the powder, so that the powder can be transferred under pressure even if the amount of gas flowing in the circumferential passage is small.
Further, when the circumferential passage is formed with a certain angle in the outer circumferential direction, the powder is more likely to be discharged along the inclined passage in the circumferential passage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A powder pressurizing and feeding device according to the present invention is shown in FIG.
-Specific description will be made based on the embodiment shown in FIG.
In these figures, the same parts as those of the conventional device shown in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted to avoid duplication. As shown in FIG. 1, the powder in the hopper 1 is quantitatively supplied by a feeder 2 to an air transport device 4 driven by a blower 3, and is supplied to a rotor 7 of the powder pressure supply device via a powder transfer pipe 5. To be done.

The powder supplied into the rotor 7 is subjected to centrifugal force due to the rotation of the rotor and is centrifugally separated into a plurality of radial passages 8 provided in the rotor 7 to form a powder seal layer, which resists the high pressure in the casing 9. And is extruded in the circumferential direction. On the other hand, the powder is further transferred to the high pressure region 10 in the casing 9 by the high pressure air supplied from the high pressure fan 13 through the conduit 14, the control valve 15, and the passage 16 in the rotor 7, as described later. Then, the high-pressure fan 1 is guided to the air transportation device 20.
The air pressurized by 9 is supplied to a high-pressure device such as a gasification furnace. On the other hand, the gas sent from the powder transfer pipe 5 to the rotor 7 together with the powder is centrifugally separated by the rotation of the rotor 7, and is discharged to the outside of the rotor through the exhaust pipe 6.

Next, as shown in FIG. 2, the radial passages 8 provided in the rotor 7 are connected at their ends to the starting ends of the circumferential passages 11, respectively. The starting end of the second radial passage 11a is connected to the terminal end. The end of the second radial passage 11 a opens at the peripheral edge of the rotor 7. A jet nozzle 12 is coaxially opened at the start end of the circumferential passage 11. The jet nozzle 12 communicates with the conduit 14 via the passage 16 described above.

In order to transfer the powder in the circumferential passage 11, a high pressure jet is ejected from the jet nozzle 12,
The powder is delivered to the high pressure area 10 in the casing 9. As described above, the jet nozzle 12 is supplied with the high-pressure gas that has been pressurized by the compressor 13 and has passed through the conduit 14 and the control valve 15. In this case, the shorter the circumferential passage 11, the smaller the energy of the high-pressure jet. That is, the working gas flow rate can be small. Therefore, as the length of the circumferential passage, the minimum length that can stop the powder is appropriate.

Further, as shown in FIG. 3, the circumferential passage 11
When the powder is inclined toward the outlet, the powder easily flows out, but the inclination angle α is appropriately in the range of 0 ° to 25 °. Further, by rotating the rotor 7 in the direction of the jet nozzle 12 in the circumferential passage 11, it is possible to utilize the inertial force due to the rotation with respect to the movement of the powder, and the energy required for the powder transfer, that is, the amount of high-pressure gas. Is less.
The present invention has been specifically described above based on the illustrated embodiments, but the present invention is not limited to these embodiments, and within the scope of the present invention set forth in the claims, various shapes and structures can be used. It goes without saying that changes may be made.

[0012]

According to the present invention, the rotor circumferential passage is provided at the tip of the powder passage of the rotor, so that the inertial force due to the rotation of the rotor is utilized to facilitate the transfer of the particles stopped in the passage. To Therefore, according to the present invention, there is provided a powder pressure supply device capable of transferring powder with a small amount of high pressure gas.

[Brief description of drawings]

FIG. 1 is a system diagram showing a cross section of a main part of a powder pressure supply device according to an embodiment of the present invention.

2 is a cross-sectional view showing a radial passage and a flow passage that follows the radial passage in the rotor of FIG. 1;

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a cross-sectional view showing a conventional powder pressure supply device.

[Explanation of symbols]

 1 Hopper 2 Feeder 3 Blower 4 Air Transfer Device 5 Powder Transfer Pipe 6 Exhaust Pipe 7 Rotor 8 Radial Passage 9 Casing 10 High Pressure Area 11 Rotor Circumferential Passage 12 Jet Nozzle 13 Compressor 14 Conduit 15 Control Valve 16 Passage 19 High Pressure Fan 20 Pneumatic transport device

Claims (1)

[Claims] 1. A powder pressurizing and feeding apparatus for feeding powder supplied to the center of a rotor under a high pressure by centrifugal force of the rotor through a plurality of passages radially provided inside the rotor, wherein A powder pressurizing and feeding device characterized in that a rotor circumferential passage and a radial passage are connected to the end of the passage and the end of the circumferential passage, respectively.