JP2694211B2 - Multi-directional dispensing device for powder and granules - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is directed to a plurality of directions in which a powder or granular material stored in a storage tank is sealed (keeps airtightness) at its discharge port by the powder or granular material itself. More specifically, the present invention relates to a device for discharging a granular material suitable for discharging a granular material having a wide particle size distribution. (Prior Art) As a device for discharging a granular material having a function of sealing a discharge port of a storage tank with the granular material itself, for the purpose of discharging a fixed amount of cement, coal, or the like, the conventional storage tank 1 has been used. The upper end of a so-called L valve tube 5'bent in an L shape is connected to the discharge port 3'of ', and the granular material from the storage tank 1'is deposited on the horizontal tube portion of the L valve tube 5'. A structure has been devised (see FIG. 4, hereinafter referred to as the former) in which a fixed amount of powder or granules is continuously blown while continuously blowing the powder or granules with nitrogen gas or the like. As another prior art, an L-shaped bent portion below the powder discharge duct is provided with a gas blowing nozzle for flowing the powder and a gas blowing nozzle for transport, and the powder deposited on the L-shaped bent portion. Dispensing device having a structure for discharging fluidized fluid (Japanese Patent Laid-Open No. 52-
No. 65367, hereinafter referred to as the latter) has been proposed. (Problems to be Solved by the Invention) However, the above-described conventional powder or granular material dispensing device is
There was a problem in the following points. (A) When weighing the powder or granules in the storage tank and charging it into another container, the powder or granules are alternately discharged from the storage tank to two or more weighing tanks, and the weight or granular material is discharged from one weighing tank. If the powder and granules in the storage tank are discharged to another weighing tank while the powder and granules are being loaded into another container, the powder and granules are continuously weighed from the storage tank while being weighed. Although the powder and granules can be charged into the container (1), both the former and the latter can dispense the powder and granules only in one direction, and therefore cannot be used for such an application. (B) In the case of the above (a), a branch pipe is provided on the downstream side of the former or the latter, and a mechanical switching valve is provided at the branch portion, and the payout direction is switched by this switching valve to form a plurality of weighing tanks. It is conceivable that the powder and granules can be dispensed alternately, but in the configuration using such a mechanical valve, the powder and granules are fitted into the gap between the valve body and the pipe wall, and the valve is There is a possibility that various troubles may occur such that switching cannot be performed. (Object of the Invention) The present invention has been made in view of the above points, and it is possible to selectively or simultaneously dispense in a plurality of directions while sealing the discharge port of a storage tank with a granular material having a wide particle size distribution. An object of the present invention is to provide a multi-directional dispensing device for powder particles, which is capable of adjusting the amount of powder particles dispensed. (Means for Solving the Problems) The gist of the present invention for achieving the above-mentioned object is to provide a plurality of units for dispensing the powder or granular material in the storage tank to a plurality of containers having a pressure difference from the plurality of containers. A direction payout device,
A plurality of horizontal pipes that branch in the radial direction are respectively connected to the lower end of one discharge chute that extends downward from the discharge port at the bottom of the storage tank, and a discharge pipe extends downward at the tip of each horizontal pipe. , By stopping the movement of the granular material by depositing the granular material from the lower surface of each horizontal pipe to the inside of the discharge chute, the discharge port is sealed by the granular material itself against the pressure difference (with other parts). To maintain a pressure difference by airtightly separating the two)
The length of each horizontal pipe (specifically, the length from the lower end branch part of the discharge chute to the discharge pipe at the tip part) is determined so that it can be lowered to the discharge pipe side of each horizontal pipe in the lower end branch part of the discharge chute. Is inclined to provide an inclined surface, a carrier gas blowing nozzle is provided on each inclined surface, and a carrier gas supply source is connected to each nozzle via a pulse valve with a controllable opening interval. The powder particles in the horizontal pipe accumulated near the inclined surface are selectively or simultaneously discharged to the plurality of discharge pipes by the blowing of the carrier gas intermittently blown from the blowing nozzle and the drop by gravity. That is what I did. (Operation) According to the multi-directional discharging device for granular powder of the present invention, even when a granular material having a wide particle size distribution is stored in the storage tank, the granular material of various particle sizes smoothly discharges the discharge port. After passing through the discharge chute, it is once deposited on multiple slopes in the branch (that is, from the bottom surface of each horizontal pipe including the slope to the inside of the discharge chute), and the discharge route is sealed to the storage tank side. The pressure difference with the discharge pipe side is maintained, and the powder and granules deposited on each inclined surface have the repose angle of the powder and granules destroyed by the carrier gas that is intermittently blown into the horizontal pipe in the discharge direction. It is also possible to adjust the amount of powder or granules discharged (the amount of discharge per unit time) by changing the pulse interval (opening interval of the pulse valve) for discharging the carrier gas from the discharge pipe. it can. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a dispensing device of the present invention.
In the figure, reference numeral 1 denotes a storage tank, which is composed of a tank whose bottom portion is formed in an inverted conical shape, and a discharge port 2 for the granular material is opened in the center of the bottom portion of the storage tank 1. The hole diameter d of the discharge port 2
Is set to a size that allows the largest particle size of the particles supplied to the storage tank 1 to pass through sufficiently. Reference numeral 3 denotes a discharge chute extending downward from the discharge port 2. At the lower end of the discharge chute 3, the base ends of two horizontal pipes 4 branched in opposite directions communicate with the discharge chute 3. And the discharge pipes 5 extend downward at the tips of the horizontal pipes 4, respectively. The base end of each horizontal pipe 4 is formed with an inclined surface 4a whose lower end is inclined toward the discharge pipe 5 side at the tip. The inclination angle β of the inclined surface 4a is set to be the angle of repose α or larger than that so that the granular material does not stay.
The height h of 4a is set to be slightly lower than the inner diameter of the horizontal pipe 4. Further, the inner diameter and the length of the horizontal tube 4 (correctly, the length of the lower surface) are such that powder particles from the outlet 2 are deposited on the lower surface of the horizontal tube 4 to form an inclined surface of the angle of repose α. To be,
Each is set. 6 is a carrier gas blowing nozzle, and one or more nozzles 6 are provided on the inclined surface 4a,
It is deployed toward the front (horizontal direction). Reference numeral 7 is a pulse valve capable of controlling the interval of valve opening (the opening time is usually less than 1 second), and the carrier gas supply source 8 is connected to the nozzle 6 via the pulse valve 7. In addition,
An inert gas such as nitrogen gas is usually used as the carrier gas. According to the dispensing device of the above-described embodiment, when powder particles having a wide particle size distribution are stored in the storage tank 1, the powder particles pass through the discharge ports 2 at the bottom of various particles and are discharged from the discharge chute 3 to a lower position. Deposit on each inclined surface 4a of the bifurcation. In this state, the discharge path of the granular material is sealed with the granular material, and the pressure difference between the inside of the storage tank 1 and the discharge pipe 5 side is maintained. here,
By intermittently blowing the carrier gas from the nozzle 6 of the horizontal pipe 4 in the direction in which the powder or granules are to be discharged, the powder or granules can be discharged to the discharge pipe 5 on the tip side, and also on both sides. If the carrier gas is blown from the nozzle 6 of the horizontal pipe 4, the powder and granules can be discharged to the two discharge pipes 5 at the same time. Further, by changing the pulse interval at which the carrier gas is blown by the pulse valve 7, it is possible to adjust the amount of powder or granules to be dispensed. Next, FIG. 2 shows a dispensing device according to another embodiment of the present invention, in which this device is different from the above embodiment.
That is, at the lower end of the discharge chute 3, three horizontal pipes 4 are continuously provided in the radial direction so that the granular material can be discharged in three directions. The angle γ in the circumferential direction between the horizontal tubes 4 adjacent to each other is preferably 90 ° or more, and the carrier gas blown out from the nozzle 6 of one horizontal tube 4 is deposited on another horizontal tube 4. Avoid affecting the grain. In the figure, the constituent members common to the first embodiment are the first
The same reference numerals as those in the figure are used. Next, FIG. 3 is a transfer path diagram of ores from the preliminary reduction furnace to the smelting reduction furnace in the reduction process of the ore containing the metal oxide, which is equipped with the dispensing device of the first embodiment described above. In the figure, a preliminary reduction furnace 21 corresponding to the storage tank 1
The high temperature powdery ore pre-reduced in
Deposited on the inclined surface 24a of the lower branch section, one of the horizontal pipe 24 _A
And the discharge pipe 25 _A to the one of the two weighing tanks 33 _A and 33 _B , 33 _A , and the other horizontal pipe 24 _B and the discharge pipe 25 _A.
From the other weighing tank 33 _B supplied with the ore by _B , the pre-reducing ore is weighed and charged into the lower smelting reduction furnace 35 through the L valve pipe 34 _B. And weighing tank
When the ore in 33 _B is emptied, the pre-reducing ore is weighed and charged into the smelting reduction furnace 35 below from the weighing tank 33 _A to which the ore is supplied via the L valve pipe 34 _A. In this manner, the ore preliminarily reduced in the preliminary reduction furnace 21 is alternately discharged to the two weighing tanks, whereby the preliminary reduction ore can be continuously charged into the smelting reduction furnace 35 while being weighed. When such a high-temperature ore is used for discharging, it is necessary to apply a refractory material to the ore transfer path including the discharging device. (Effects) According to the multi-directional dispensing device for powdery particles of the present invention configured as described above, the following effects are brought about. (1) The powder or granular material having a wide particle size distribution can be selectively or simultaneously discharged from a storage tank in a plurality of directions. (2) Since the carrier gas is blown intermittently to blow out the powder or granules, the conveying force for the powder or granules is more effective than in the direction in which the gas is continuously blown.
The powder can be discharged effectively with a small amount of gas,
Also, the gas injection interval (that is, the pulse valve opening interval)
It is also possible to adjust the payout amount of the granular material (referred to as the payout amount per unit time) by changing. (3) Due to the effect of (1) above, for example, ores used as a raw material for iron making and having a wide range of particle size distribution are directly charged into a preliminary reduction furnace without preliminary treatment such as sieving or crushing, and preliminarily reduced, This pre-reduced ore can be continuously discharged into two or more weighing tanks and weighed and continuously charged into the smelting reduction furnace. (4) Since the powder and granules can be dispensed in the storage tank from the branching portion at the lower end of one discharge chute through a plurality of horizontal tubes in a plurality of directions in the same horizontal plane, a plurality of weighing tanks and the like are installed. You can minimize the space in case. (5) Since the discharge port of the storage tank can be sealed with the powder particles themselves by depositing the powder particles from the lower surface of the horizontal pipe to the inside of the discharge chute below the storage tank, the discharge tank between the storage tank and the downstream discharge pipe can be sealed. Even when there is a pressure difference between the two, it is possible to isolate the two and maintain the pressure difference, and to maintain the necessary pressure for both. (6) The movement of the granular material is stopped by discharging the granular material by the action of the carrier gas and the gravity which are intermittently blown as described above, and by naturally depositing the granular material on the part such as the horizontal pipe. So it consumes less gas and other energy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a first embodiment of a dispensing device according to the present invention, FIG. 2 is a sectional view showing a second embodiment of a dispensing device according to the present invention, and FIG. FIG. 4 is a transfer path diagram of ores from a preliminary reduction furnace to a smelting reduction furnace in a reduction process of ores containing metal oxides, which is equipped with the dispensing apparatus of the first embodiment shown in FIG. 1, and FIG. It is sectional drawing which shows the dispensing device of various granular materials. 1 ... Reservoir, 2 ... Discharge port, 3 ... Discharge chute, 4
...... Horizontal pipe, 4a …… Sloping surface, 5 …… Discharge pipe, 6 …… Blowing nozzle, 7 …… Pulse valve, 8 …… Carrier gas supply source.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Megumi Yamada               3-1-1 Higashi Kawasaki-cho, Chuo-ku, Kobe City, Hyogo Prefecture               No. 1 Kawasaki Heavy Industries Ltd. Kobe factory (72) Inventor Mitsuharu Kishimoto               3-1-1 Higashi Kawasaki-cho, Chuo-ku, Kobe City, Hyogo Prefecture               No. 1 Kawasaki Heavy Industries Ltd. Kobe factory (72) Kenichi Yajima               3-1-1 Higashi Kawasaki-cho, Chuo-ku, Kobe City, Hyogo Prefecture               No. 1 Kawasaki Heavy Industries Ltd. Kobe factory                (56) References JP-A-60-143822 (JP, A)                 62-144541 (JP, U)                 Actual public Sho 63-23372 (JP, Y2)                 Actual Kohei 2-15864 (JP, Y2)

Claims (1)

(57) [Claims] A multi-directional dispensing device for dispensing the granular material in the storage tank to a plurality of containers having a pressure difference with this, at the lower end of one discharge chute extending downward from the discharge port of the storage tank bottom, Multiple horizontal pipes that branch in the radial direction are connected in series, and discharge pipes are extended downward at the tip of each horizontal pipe, and powder particles are deposited from the bottom surface of each horizontal pipe into the discharge chute. The length of each horizontal pipe is determined so that the movement of powder and granules can be stopped and the discharge port can be sealed by the powder and granule itself against the above pressure difference, and the discharge of each horizontal pipe in the lower end branch part of the discharge chute Slopes are provided by inclining downward to the pipe side, each nozzle has a carrier gas injection nozzle, and a carrier gas supply source is connected to each nozzle via a pulse valve with a controllable opening interval. Water accumulated near each of the slopes The powder in the pipe is characterized in that it is selectively or simultaneously discharged to the plurality of discharge pipes by being blown off by a carrier gas blown intermittently from the blowing nozzle and dropped by gravity. Multi-directional dispensing device for granules.