JP2812170B2 - Powder dispensing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus (so-called L-shaped device) formed by a vertical pipe and a horizontal pipe to form an L-shape, and for discharging powder and granules received from the vertical pipe by gas blown into the horizontal pipe. Valve).

[0002]

2. Description of the Related Art An example of an apparatus for dispensing L-shaped powders is disclosed in Japanese Patent Application Laid-Open No. 1-130725. This device is, for example, a device that dispenses high-temperature particulate ore discharged from a preliminary reduction furnace in a metal oxide reduction step while sealing itself.

FIG. 3 is a sectional view showing the payout device. Numeral 1 denotes a storage tank for the granular material, which is mounted on a measuring device 30 such as a load cell. At the bottom of the storage tank 1 is provided a discharge port 2 for the granular material. The discharge port 2 is connected to an L-shaped valve pipe 3 composed of a vertical pipe section 4 and a horizontal pipe section 5. The hole diameter d of the discharge port 2 and the inner diameter of the vertical pipe portion 4 of the L-shaped valve pipe are sized so that those having the maximum particle size of the powdery material can pass smoothly. The inner diameter and the length of the horizontal pipe portion 5 are set so that the granular material falling from the discharge port 2 accumulates to form a slope having a repose angle α. Reference numeral 6 denotes a discharge pipe.

A gas injection nozzle 31 for injecting a carrier gas such as nitrogen is provided near the bent portion of the L-shaped valve pipe 3, and this nozzle 31 is provided via a pulse valve 32 whose opening interval can be controlled. It is connected to a carrier gas supply 33. Numeral 34 denotes a control device for the pulse valve 32, which adjusts the opening interval of the pulse valve 32 based on a change in the amount of reduction of the granular material detected by the metering device 30, and controls the amount (flow rate) of discharging the granular material. It is configured to control.

FIG. 4 shows a device similar to the above device. In this figure, reference numeral 1 denotes a storage tank for powdery and granular materials, and reference numeral 2 denotes a discharge port provided at the bottom thereof. 3 is connected to the outlet 2 of the storage tank, and the vertical pipe 4 and the horizontal pipe 5
L-shaped valve pipe, and 6 is a discharge pipe. 7
Reference numerals a and 7b denote carrier gas injection nozzles provided near the bent portion of the L-shaped valve pipe 3, and a carrier gas supply pipe 8 is connected to the nozzles 7a and 7b. The carrier gas supply pipe 8 has a built-in gas volume adjusting mechanism. 11 is a flow detector, 12 is a control valve, 10 is a flow controller, and 9 is a flow setter. Numeral 40 denotes a powder. This apparatus is simpler than the apparatus shown in FIG. 3, and is configured to adjust the amount of the powder to be dispensed by changing the amount of the carrier gas blown.

In each of the above-described apparatuses, the slope of the granular material deposited and formed on the horizontal pipe portion 5 of the L-shaped valve pipe is broken by blowing a carrier gas, and the broken granular material is transferred forward. Pay out from the discharge pipe 6. Then, the granular material corresponding to the collapsed amount descends sequentially from the vertical tube portion 5, and a slope of the granular material is always formed on the horizontal tube portion 5.

[0007]

However, the angle of repose α of the granular material differs depending on properties such as the particle size and temperature, and is not always constant. In particular, when the powder is at a high temperature, the angle of repose α may be very small. When the angle of repose α of the granular material becomes small, the length of the horizontal tube 5 for forming the slope of the granular material becomes insufficient, and the granular material overflows from the horizontal tube 5. For this reason, the stationary slope is not formed in the horizontal pipe portion 5, and a phenomenon (so-called flowing-in) that flows out only by the static pressure of the granular material itself without blowing the carrier gas occurs. In such a state, it becomes impossible to adjust the flow rate of the granular material, which causes a serious problem in operation.

It is an object of the present invention to provide a dispensing device which can prevent the inflow phenomenon caused by the change of the angle of repose due to the change of the properties of the granular material and can adjust the flow rate of the granular material. I do.

[0009]

In order to achieve the above object, according to the present invention, a discharge pipe is provided downward at an end of a horizontal pipe part constituting an L-shaped valve pipe in a powder-particle transfer direction,
A mechanism is provided in which a tube whose outer surface is close to the inner surface of the discharge tube is inserted into the discharge tube, and the tube is moved up and down.

[0010]

In order to prevent the flow-in phenomenon of the granular material, the horizontal pipe portion of the L-shaped valve pipe must have a length such that the slope is formed even when the angle of repose of the granular material changes. There is.
In consideration of such a situation, if the horizontal pipe portion is lengthened so that the angle of repose of the granular material may change in any way, the amount of carrier gas blown during a normal operation becomes extremely large. Become.

Therefore, in the present invention, a tube is inserted into a discharge tube provided at the end of the horizontal tube, and the tube is moved up and down. With such a configuration, even if the angle of repose of the granular material becomes small, if the cylinder is raised and its upper end is made higher than the bottom of the horizontal pipe portion, the cylinder functions as a weir and the powder acts as a weir. Since the flow of the body is stopped, the powder is not discharged unless the height of the granular material at the end of the horizontal tube reaches the upper end of the cylinder. Further, by moving the cylinder inserted into the discharge pipe up and down, the amount (flow rate) of dispensing the powder and granules can be adjusted.

[0012]

FIG. 1 is a schematic longitudinal sectional view showing an embodiment of the present invention. In this figure, the same components as those described in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof is omitted.
In this embodiment, a cylinder 20 is inserted into a discharge pipe 6 provided at an end of a horizontal pipe section 5 constituting an L-shaped valve pipe. The outer diameter of the cylinder 20 is slightly smaller than the inner diameter of the discharge pipe 6, and the length thereof is longer than the inner diameter D ₂ of the horizontal pipe section 5. The cylinder 20 is connected to a driving device such as an air cylinder 21 in a suspended state,
When the driving device is operated, it is raised or lowered. 24 is a detector for detecting the height h of the cylinder, 23 is a controller for controlling the cylinder height, and 22 is a setting device for setting the cylinder height.

FIG. 2 is a partial view of FIG. 1 and shows a state in which the upper end of the cylinder 20 is at the same height as the bottom of the horizontal tube portion 5. As shown in this figure, the dispensing of the granular material is performed when the dispensed amount is large and when there is no abnormality in the properties of the granular material.

The device of the present invention has several uses,
According to one of the uses, the dispensing of the granular material is performed as follows. In advance, the relationship between the height h of the cylinder and the dispensed amount of the granular material when the carrier gas blowing amount is kept constant is determined. Further, the case where the carrier gas blowing amount is changed is also determined.

The flow rate setting device 9 is set to a certain predetermined flow rate to keep the carrier gas blowing amount constant. The set value of the height setting device 22 is set to the value of the height h of the cylinder from which a predetermined amount of the granular material is discharged at the gas blowing amount.

If the amount of powder to be dispensed is excessive or insufficient, the value of the height h of the cylinder is changed. If the flow-in phenomenon of the granular material occurs, the cylinder 20 is greatly raised, and once the flow of the granular material is stopped, the cylinder 20 is gradually lowered, and the appropriate amount of the granular material is reduced. Operate so that is paid out.

As another usage, although not shown in FIG. 1, the rate of reduction of the granular material in the storage tank 1 or the flow rate of the granular material discharged at another location is measured. The dispensing amount of the granular material can be controlled based on any of the values. In this case, either the flow rate of the carrier gas or the height of the cylinder is controlled, or both are controlled.

Next, the results of comparing the dispensing performance of the apparatus of the embodiment of FIG. 1 and the conventional apparatus of FIG. 4 will be described with reference to FIGS. 5 and 6. In addition, these devices are
The iron ore was placed in the path where the particulates were discharged from the preliminary reduction furnace in the smelting reduction facility.

Implementation conditions Granule type: Iron ore Particle size: 3 mm or less Temperature: 800 ° C. Dimensions of L-shaped valve pipe Inner diameter of vertical pipe D ₁ : 150 mm Inner diameter of horizontal pipe D ₂ ; 150 mm Length of horizontal pipe L: 800 mm

FIG. 5 is a diagram showing the relationship between the height h of the cylinder and the amount of powder to be dispensed when the apparatus of the embodiment is used. In this case, the carrier gas blowing amount is 70 Nm.
^It was kept constant at ³ / h. As shown in this figure, the dispensed amount of the granular material decreases linearly as the height h of the cylinder is increased (the cylinder is raised). Further, when the height h of the cylinder reaches a certain value, the granular material does not flow out. Then, the amount of change of the powder and granular material discharge with respect to the change of the height h of the cylinder is always constant, and the discharge can be performed with high accuracy.

FIG. 6 is a diagram showing the relationship between the amount of carrier gas blown and the amount of powdered material discharged when a conventional apparatus is used. In this figure, the discharge amount of the granular material increases with the increase of the carrier gas blowing amount,
The amount of change in the amount of granular material discharged with respect to the change in the amount of blowing of the carrier gas is not constant, and its accuracy is not very good. In the above embodiment, the case where the cylinder to be inserted into the L-shaped valve pipe or the discharge pipe is a cylinder has been described. However, these may be square, and the shape is not limited.

[0022]

According to the present invention, a discharge pipe is provided downward at the end of the horizontal pipe part constituting the L-shaped valve pipe in the powder-particle transfer direction, and a pipe is inserted into the discharge pipe. Since a mechanism for moving the cylinder up and down is provided, and the above-described cylinder functions as a weir, even if a phenomenon of inflow of the granular material occurs, it is possible to prevent the inflow by raising the cylinder.
Further, even if the properties of the granular material change, the flow rate of the granular material can be adjusted with high accuracy by moving the cylinder up and down.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a partial view of FIG. 1 showing a state in which an upper end of a cylinder is at the same height as a bottom surface of a horizontal tube portion.

FIG. 3 is a cross-sectional view showing a conventional payout device.

FIG. 4 is a schematic longitudinal sectional view showing another conventional dispensing device.

FIG. 5 is a diagram showing the relationship between the height of a cylinder and the amount of powder and granular material dispensed when the apparatus of the embodiment is used.

FIG. 6 shows a carrier and a carrier when a conventional apparatus is used.
It is a figure which shows the relationship between the blowing amount of gas, and the discharge amount of a granular material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage tank of granular material 2 Discharge port of storage tank 3 L-shaped valve pipe 4 Vertical pipe section 5 Horizontal pipe section 6 Discharge pipe 7a, 7b Carrier gas blowing nozzle 8 Carrier gas supply pipe 9 Flow rate setting device 10 Flow rate Controller 11 Flow rate detector 12 Control valve 20 Cylinder 21 Air cylinder 22 Cylinder height setting device 23 Height controller 24 Height detector 40 Powder and granular material

Continuation of the front page (72) Inventor Susumu Isozaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) B01J 4/00 B01J 4 / 02 B65D 90/54

Claims (1)

(57) [Claims] 1. A bent portion of an L-shaped valve pipe comprising a vertical pipe section for receiving a powder and a horizontal pipe section for transferring a powder and a body continuously formed integrally with a lower end thereof, In the discharge device of the granular material provided with a gas injection nozzle for transferring the granular material, a discharge pipe is provided downward at an end of the horizontal pipe portion in the granular material transfer direction, and in the discharge pipe, A powder and granular material dispensing device, characterized in that a tube having a size whose outer surface is close to the inner surface of the discharge pipe is inserted and a mechanism for vertically moving the tube is provided.