JPS5882923A - Powder pneumatic transport method - Google Patents

Abstract

PURPOSE:To carry a specified amount of powder by compressed air by keeping the pressure of a measuring hopper, an automatic powder quantitative supply device and a mixer for pneumatic transport equally higher than the atmospheric pressure, and supplying powder by specified amounts from the supply device to the mixer. CONSTITUTION:A valve 15 is opened to supply compressed air to an air jet nozzle 12, and an electric motor 18 is driven to rotate a rotor 21 of a powder supply device 9 through a vertical shaft 20. The pulverized coal in a measuring hopper 1 is filled up between blades 21a of the rotor 21 to be levelled by a levelling plate 19, and discharged by specified amounts from a powder discharge outlet 10 to a pneumatic transport pipe 16 by its gravity and compressed air ejected from the lower surface of the air jet nozzle 12 to be supplied through the pneumatic transport path 16 to a pulverized coal combustion furnace 17. The coal is burned here. When the pulverized coal in the measuring hopper 1 decreases, a valve 14 is opened to supply compressed air to a service hopper 2 so that the pressure of the service hopper is equal to that of the measuring hopper 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pneumatic transportation method for transporting powder such as pulverized coal, cement, and water treatment agents using a gas such as pressurized air.

Conventionally, in the above-mentioned pneumatic feeding method, powder is generally fed down the street by gravity from a metering hopper open to the atmosphere to a pneumatic mixer using a rotary set of automatic metering powder feeding device. In this conventional pneumatic method,
Mixer and powder feeding device, powder feeding device and measuring hole
Although a sealing mechanism is installed between the This causes problems such as abrasion of the powder supply device and the like, and pulsation during pneumatic feeding, making it difficult to maintain a predetermined amount of powder while pneumatically feeding the powder.

This invention achieves
It is an object of the present invention to provide a method that solves the above-mentioned problems and can secure a predetermined amount of powder and stably pneumatically convey it.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In Fig. 1, l is a measurement point 9- [L on this measurement point example-1 is a service hora''-22> (setting,
Service Hotnoguichi 2 Kt [Kura hopper 3 is provided. From service hopper-2 to weighing hotsunoya-1
Gunno 4-pulp 5 and 6 are provided at the powder supply port 4a to the storage holster A-3 and the powder supply port 4b to the storage hopper A-3 color service hopper 2, respectively.

These are opened and closed by actuators 7.8. Further, an automatic quantitative powder supply device 9, which will be described later, is provided below the measuring hole/#-1. is provided.

Said storage hopper/#3 *Service hopper -2h
The air outlet housing 12 has valves 13, 14 and 1, respectively.
5 to a source of pressurized air. The lower surface of the powder discharge port 10 communicates with a pneumatic pipe 16, and the pneumatic pipe 16 opens into a pulverized coal combustion furnace 17. As shown in FIGS. 1 and 2, the powder supply device 9 includes a rotor 21 having a large number of blades 21 m fitted to a vertical shaft 20 driven by an electric motor 18 via a speed change means and a speed reducer. and said feather 2
A sliding multi-plate 19 is disposed on 1i integrally with the lower surface of the air ejection cylinder 12, and these are fixed to the peripheral wall 9a of the powder supply device 9. Further, the vertical axis 2o is provided with a cutting blade 2 that is in sliding contact with the bottom of the service hopper 2 and the storage hopper 3.
2 and 23 are fitted respectively.

To pneumatically transport pulverized coal according to an embodiment of the present invention using a pneumatic transporter constructed as described above.

First, the valve 1st is opened, and pressurized air is supplied from a pressure air source such as a blower (not shown) to the air jet [12], and the electric motor 18 is driven to rotate the powder supply device 90 rotor 21 via the vertical shaft 2o. .

In this way, the pulverized coal in the metering tube 11 is filled between the blades 21a of the rotor 21 and rubbed off by the sliding plate 19, and due to gravity and the jetting of pressurized air from the bottom surface of the air jetting case 12, A predetermined amount of the powder is discharged from the powder discharge port 10 into the pneumatic pipe 16, and then supplied to the pulverized coal combustion furnace 17 through the pneumatic pipe 16, where it is combusted.

When the amount of pulverized coal in the weighing hopper 1 decreases, this is detected by an appropriate means such as a level meter, the normally closed valve 14 is opened, and pressurized air is supplied into the service hollow/gut 2 to start the service. When the pressure in the hot spring 1 2 and the measuring hot spring 1 become equal, open the Dan / 4 - / metering loop 5. If you do this, the pulverized coal in the service hot spring 2 will be transferred to the vertical axis. The cutting blade is cut out by 220 rotations due to 200 rotations,
The powder falls into the weighing hopper 1 from the powder supply port 4& and is supplied by gravity. And in this case, Dan/#
/4 Lube 5 is ML, so service horror/mother-2
Therefore, the pressure inside the service hopper 2, the weighing pumper 1, and the powder supply device 9 is almost equal to that inside the mixer 11, that is, the air jet 1i12. pulverized coal will be replenished. Valve 14 is activated by a timer or the like.
and dan/gu-) 4 Close loop 5.

The supply of pulverized coal from the service hopper 2 to the weighing powder 1 is stopped. Thereafter, the normally closed valve 13 is opened to supply pressurized air into the storage pumper 3, and at the same time
When the valve 6 is opened, pulverized coal is replenished from the storage hot spring 3 into the service hot spring 2. In this case, the pressure in the service tube 4-2 decreases, but since the damper pulp 5 is closed, the powder supply device 9. The pressure is maintained at approximately the same level as the pressure inside the air jet cylinder 12.

The valve 13 and the damper pulp 6 are closed by the operation of a timer or the like, and the pulp is removed from the storage pulp 3 to the service hopper.
Supply of pulverized coal to No. 2 will be stopped. Note that in this embodiment, valve 13. Dunno pulp 6 and valve 14. When one of the damper valves 5 and 5 is open, the other must be closed.

In addition, in the invention of ξ, a pneumatic mixer such as a one-way ejector is connected to the discharge port of the powder supply device, and the powder supply device is caused to drop by gravity, or by a combination of this and pressurized air. It is also possible to supply powder.

In addition, in this invention, the means for detecting the pressure in the weighing hot spring 9- and the service hot spring 9- is provided by providing appropriate pressure needles in both hoppers, and using detection signals from these needles to detect the pressure in the pressure air supply passage to the service hopper. automatically controls the valve and the damper pulp provided at the powder supply port of the service hopper, or the metering hole t? -To Service Hotsuno 4-
and are each floatingly supported on the equipment frame via load cells.

Weighing hopper and service hopper, service hopper and quantity.
and the storage hopper are connected through a flexible joint,
The air pressure in the weighing hopper and the service hopper may be detected by a load cell to control the valve and damper pulp.

Furthermore, the present invention is not limited to the pneumatic conveyance of pulverized coal as in the embodiment described above, but can also be applied to the pneumatic conveyance of other powders such as cement and water treatment agents. Gases other than air, such as active gases, may also be used.

As explained in Explanation 1-1 above, the powder pneumatic feeding method according to the present invention maintains the insides of the weighing hopper, automatic metered powder supply device, and pneumatic mixer at substantially equal pressures higher than atmospheric pressure, and performs weighing. Since the powder feeder supplies the powder to the mixer in fixed amounts in bottles, it is possible to prevent pulsation from occurring when the powder is measured before being air-fed.
therefore.

The effect is that a predetermined amount of powder can be pneumatically delivered accurately and stably.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal cross-sectional view showing an apparatus for performing a powder pneumatic feeding method according to an embodiment of the present invention, and FIG. 82 is a cross-sectional view taken along the line ■-■ in FIG. 1. l...Weighing hopper, 2...Service hopper, 3
...Storage hoppers 4, 5t5...Damper pulp. 9... Automatic quantitative powder supply device, 11... Pneumatic mixer. 13.14,15...Valve, 16...Pneumatic pipe. Patent applicant agent

Claims (2)

[Claims] (1) When supplying powder from the measuring hot spring 4- to the pneumatic mixer by the automatic quantitative powder feeding device, the inside of the powder feeding device 9 and the pneumatic mixer must be kept above atmospheric pressure. A method of pneumatically feeding powder, which is characterized by maintaining almost uniform pressure. (2) Service Honno 4 to replenish powder to the weighing hopper
- Equalize the pressure in the measuring hopper, and open the valve number provided between the two hoppers, service hot spring 4-
A method for pneumatically feeding powder according to claim 1, characterized in that the powder is replenished from the measuring hopper to the measuring hopper.