JPH04333420A - Powder pressurizing and supply device - Google Patents

Abstract

PURPOSE:To surely control the flow rate of powder by forming a passage, provided radially in a rotory and pressurizing the powder by centrifugal force, in an L-shape in the rotor peripheral direction, and fully stopping the powder at an L-shaped outlet, even the rotational frequency of the rotor is large, then to send the powder to a jet flow. CONSTITUTION:An L-shaped flow passage 11 is provided toward a rotor 7 peripheral direction on a passage 8 outlet in a rotor 7 radius direction, for controlling the flow rate of fine powder coal when the fine powder coal is compacted by the centrifugal force of the rotor 7 and is supplied in a casing 9 under high pressure. Powder is once stopped at the passage 8 outlet, and a high pressure jet is blown out appropriately from a jet nozzle 12 to send the powder into the casing 9. The length of the L-shaped flow passage 11 in the rotor 7 peripheral direction is 1--3 times the flow passage 11 diameter, and the flow passage 11 is changed toward the rotor 7 radius direction again to form an opening part 11a on the rotor 7 periphery edge. An L-shaped angle of the flow passage 11 is made 85 deg.-75 deg. to a normal line from the rotor 7 center.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurized powder supply device used for supplying pulverized coal to a pressurized entrained bed coal gasifier.

0002

[Prior Art] Figure 3 shows the patent application No. 15 filed in 1999 by the present applicant.
8341 (Japanese Unexamined Patent Publication No. 3-26608) is a structural explanatory diagram of a powder pressurizing and supplying device pending application. In the figure, this powder pressurizing supply device compresses powder by the centrifugal force of a rotor 7 and supplies the powder into a casing 9 under high pressure.The rotor 7 is used to control the flow rate of the powder. An L-shaped flow path 11 is provided at the outlet of the radial passage 8 in parallel to the rotor axis 25 to temporarily stop the powder, and a high-pressure jet is spouted from the jet nozzle 12 as appropriate to send this jet into the casing 9. It is designed to be sent to 28, 29, 30, 31
is a labyrinth seal.

0003

As described above, in the above-mentioned powder pressurizing supply device, an L-shaped flow passage 11 is provided at the outlet of the passage 8 in the radial direction of the rotor 7 in order to control the flow rate of the powder. However, since the thickness of the rotor 7 is limited, it is difficult to provide a sufficiently long L-shaped flow path 11 parallel to the rotor axis 25, and the rotation of the rotor 7 If the number is large, the powder may not stop completely.

0004

[Means for Solving the Problems] A powder pressurizing and feeding device according to the present invention is aimed at solving the above problems, and is provided in a rotor radially from the center thereof, pressurizes the powder by centrifugal force, and outputs the powder by centrifugal force. is characterized by a configuration including an L-shaped passage in the circumferential direction of the rotor, and a nozzle that spouts a jet stream at an L-shaped outlet of the passage.

[0005]

[Operation] That is, in the powder pressurizing supply device according to the present invention, a nozzle is provided at an L-shaped outlet in the circumferential direction of the rotor of a passage provided radially from the center of the rotor to pressurize the powder by centrifugal force. By directing the L-shaped outlet of the passage in the circumferential direction of the rotor, a sufficient length in the circumferential direction can be provided at the outlet of the passage without being limited by the thickness of the rotor. Even when the rotational speed of the rotor is high, the powder is completely stopped at the L-shaped outlet and sent out by the jet flow.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of the structure of a pressurized powder supply device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of its operation. In the figure, the powder pressurized feed device according to this embodiment is used to feed pulverized coal to a pressurized entrained bed coal gasifier, and has almost the same structure as the powder pressurized feed device shown in FIG. 3. The rotor 7 compresses the pulverized coal by the centrifugal force of the rotor 7 and supplies the pulverized coal into the casing 9 under high pressure. radial passage 8
An L-shaped flow path 11 is provided at the outlet toward the circumferential direction of the rotor 7 to temporarily stop the powder, and a high-pressure jet is spouted from the jet nozzle 12 as appropriate to send the powder into the casing 9. ing.

The length of this L-shaped channel 11 in the circumferential direction of the rotor 7 is 1 to 3 times the diameter of the channel 11, and is bent again in the radial direction of the rotor 7 to form an opening 11a at the circumferential edge of the rotor 7. Ori,
By oriented in the circumferential direction of the rotor 7 rather than parallel to the rotor axis 25, it is provided sufficiently long regardless of the thickness of the rotor 7. Further, the angle of the L-shape of the flow path 11 is set to 85° to 75° with respect to the radiation from the center of the rotor 7, so that the powder is reliably stopped. If this angle is more than 85 degrees, it is difficult to stop the powder reliably, and if it is less than 75 degrees, the circumferential length of the L-shaped flow path 11 becomes long, and a large amount of high-pressure jet is required. In tests using model machines, particularly favorable results have been obtained at around 80°. In addition, the direction of the flow path 11 in the circumferential direction of the rotor 7 is opposite to the rotating direction of the rotor 7, and as the powder transfer speed decreases, the centrifugal force decreases and the frictional resistance in the flow path 11 decreases. The amount of high-pressure jet (energy amount) from the jet nozzle 12 is reduced.

When pressurizing pulverized coal and supplying it to a pressurized spouted bed coal gasifier using this powder pressurizing supply device, the pulverized coal in the low-pressure powder hopper 1 is fed to the feeder 2 by blower 3 with air. It is supplied in fixed amounts to the transport device 4 and sent to the space 6 in the rotor 7 of this device via the transfer pipe 5. The powder sent to the space 6 inside the rotor 7 is sent into the passage 8 provided in the radial direction inside the rotor 7 by the centrifugal force of the rotating rotor 7, and is compacted by the stronger centrifugal force, and is sealed into the casing 9.
The gas is pushed out into an L-shaped flow path 11 provided in the circumferential direction of the rotor 7 against the gas pressure of the high pressure region 10 inside, and is temporarily stopped. A high-pressure jet is appropriately ejected from a jet nozzle 12 into the L-shaped flow path 11 to transfer the powder to a high-pressure region 10 within the casing 9 . The powder transferred to the high pressure region 10 is supplied to the high pressure device 21 of the pressurized spouted bed coal gasifier by a pneumatic transport device 20 driven by gas pressurized by the compressor 19.

The high-pressure jet gas ejected from the jet nozzle 12 is pressurized by the compressor 13, and then passed through the conduit 14.
, control valve 15, passage 16 in casing 9, space 17
, the jet nozzle 12 via the passage 18 in the rotor 9, etc.
supplied to Further, the gas sent from the powder transfer pipe 5 to the space 6 in the rotor 7 together with the powder is centrifuged by the rotation of the rotor 7, and then sent to the exhaust pipe 22, the dust collector 23, and the vacuum It is released into the atmosphere through the pump 24 and the like. Also, a part of the high-pressure jet gas ejected into the space 17 in the casing 9 passes through the labyrinth seal 28 to the high-pressure area 10, and the other part passes through the labyrinth seal 29,
30 to the atmosphere, and some others to Labyrinth Seal 3
0 and 31, and is sent to the space 6 in the rotor 7.

The powder in the passage 8 provided in the rotor 7 is sent to an L-shaped passage 11 by the centrifugal force of the rotor 7.
It once stops at a flow path 11 provided in the circumferential direction of the rotor 7 and is compacted. If this flow path is perpendicular to the radiation from the center of the rotor 7 or inclined toward the opening 11a, the powder will have a component force Fh of the centrifugal force F=ργω2, and the jet nozzle will Even if the high-pressure jet is not ejected from 12, it flows out to the opening 11a. On the other hand, as shown in Figure 2, by setting the slope θ appropriately, θ=approximately 10°.
By setting, component force Fh=0, or Fh=ργω2
The direction of sin θ is opposite to the opening 11a, and unless a high-pressure jet is ejected from the jet nozzle 12, the powder stops. Then, when a high-pressure jet is ejected from the jet nozzle 12, the powder moves to the opening 11a and is transferred to the high-pressure region 10 in the casing 9 by centrifugal force F=ργω2.

The pressurized powder supply apparatus according to the present invention is not limited to the above-mentioned embodiments, and can be applied to a pressurized fluidized bed gasifier, a pressurized fluidized bed gasifier, a pressurized spouted bed coal gasifier, etc. It can also be used to supply powder to fluidized bed boilers, blast furnaces, other pressurized furnaces, high pressure equipment, etc.

0012

[Effects of the Invention] The pressurized powder supply device according to the present invention is constructed as described above, and even when the rotational speed of the rotor is high, the powder is completely stopped at the L-shaped outlet and sent out by a jet stream. Therefore, the flow rate of powder can be controlled reliably.

[Brief explanation of drawings]

FIG. 1(a) is a flow system diagram of a powder pressurization supply apparatus according to an embodiment of the present invention, and FIG. 1(b) is a sectional view of the main part thereof.

FIG. 2 is an explanatory diagram of its operation.

FIG. 3 is a sectional view of the main part of the powder pressurization supply device, which is currently being applied for.

[Explanation of symbols]

1 Powder hopper 2 Feeder 3. Blower 4 Pneumatic transportation device 5 Powder transfer pipe 6 Space part 7 Rotor 8 Passage 9 Casing 10 High pressure area 11 L-shaped flow path 11a Opening 12 Jet nozzle 13 Compressor 14 Conduit 15 Control valve 16 Passage 17 Space section 18 Passage 19 Compressor 20 Pneumatic transportation device 21 High pressure equipment 22 Exhaust pipe 23 Dust collector 24 Vacuum pump 25 Rotor shaft 26 Bearing 27 Motor

Claims (1)

[Claims] Claim 1: A passage provided radially from the center of the rotor to pressurize the powder by centrifugal force and having an L-shaped outlet in the circumferential direction of the rotor, and an L-shaped outlet of the passage. A pressurized powder supply device comprising: a nozzle that ejects a jet stream.