JPH01127524A - Delivering device in plural directions for bulk material - Google Patents

Abstract

PURPOSE:To enable delivery in plural directions by providing inclined faces the lower portions of which are inclined to the end discharge pipe side of each horizontal pipe in a branching portion on the lower end of a discharge chute and placing nozzles for intermittently blowing a carrier gas into each of the inclined faces. CONSTITUTION:Even when a bulk material having a wide range of grain size distribution is stored in a storage tank 1, the bulk material with various grain sizes smoothly passes through a discharge port 2, temporarily piled on plural inclined faces 4a provided on a branching portion on the lower portion of a discharge chute 3, forms an angle of repose sealing a discharging courses, and keeps the pressure difference between the storing vessel 1 side and discharge pipes 5 side. The bulk material piled on each inclined face 4a is selectively or simultaneously delivered from the discharge pipes 5 by intermittently blowing a carrier gas from a feeding source 8 in the direction of horizontal pipes 4 out of a blow-in nozzle 6 provided on each inclined face 4a via pulse valves 7. In this case, as the operating intervals of the pulse valves are varied, the delivering quantity can be adjusted.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention allows powder and granules stored in a storage tank to be transported in multiple directions while sealing the discharge port with the powder itself (maintaining airtightness). The present invention relates to a device for dispensing powder and granules, and more specifically, to a dispensing device for powder and granules that is particularly suitable for dispensing powder and granules having a wide particle size distribution.

(Prior Art) Conventionally, a storage tank 1 has been used as a powder dispensing device that has the function of sealing the discharge port of a storage tank with the powder itself, and is used for discharging cement, coal, etc. in fixed amounts.
The upper end of a so-called L-valve pipe 5' bent in an L shape is connected to the outlet 3° of the L-valve pipe 5°, and the powder from the storage tank 1° is deposited on the horizontal pipe part of the L-valve pipe 5°. A structure has been devised in which a fixed amount of powder is discharged by constantly blowing the powder with continuously introduced nitrogen gas or the like (see FIG. 4, hereinafter referred to as the former). In addition, as another prior art, a powder and granular material discharge duct is provided with a gas blowing nozzle for flowing the powder and a gas blowing nozzle for conveying the L-shaped bent part below the granular material discharge duct, and the powder and granular material accumulated in the L-shaped bent part is A dispensing device with a structure that dispenses while fluidizing the
No. 65367, hereinafter referred to as the latter) has been proposed.

(Problems to be Solved by the Invention) However, the above-described conventional powder dispensing device has the following problems.

(a) When weighing the granular material in the storage tank and charging it into another container, the granular material is alternately discharged from the storage tank into two or more weighing tanks, and from one weighing tank. By discharging the powder and granules in the storage tank to another weighing tank while charging the powder and granules to other containers, it is possible to continuously weigh the powder and granules from the storage tank. Powder can be charged into the container, but since both the former and the latter can only dispense the powder in one direction, they cannot be used for such purposes.

(b) In the case of Section M (a), a branch pipe is provided on the downstream side of the former or the latter, and a mechanical switching valve is installed at the branch,
It is conceivable that this switching valve can be used to switch the dispensing direction so that powder and granules can be alternately dispensed into a plurality of weighing tanks, but in a configuration using such a mechanical valve,
Various problems may occur, such as powder particles getting stuck in the gap between the valve body and the pipe wall, making it impossible to switch the valve.

(Objective of the Invention) The present invention has been made in view of the above points, and is capable of discharging selectively or simultaneously in multiple directions while sealing the discharge port of a storage tank with powder having a wide particle size distribution. It is an object of the present invention to provide a device for dispensing powder and granular material in multiple directions, which can also adjust the amount of dispensing powder and granular material.

(Means for Solving the Problems) The gist of the present invention for achieving the above-mentioned object is to provide a plurality of containers for discharging powder and granules in a storage tank into a plurality of containers having a pressure difference therebetween. The directional dispensing device includes a plurality of horizontal pipes branching in the radial direction at the lower end of a discharge chute extending downward from the discharge port at the bottom of the storage tank, and a discharge pipe at the tip of each horizontal pipe. An inclined surface is provided in the lower end branch of the discharge chute, extending downward and sloping downward toward the distal end discharge pipe side of each of the horizontal pipes, and a carrier gas blowing nozzle is provided on each inclined surface. , a carrier gas supply source is connected to each nozzle via a pulse valve, and the powder and granules deposited on each of the inclined surfaces are selectively or This means that they are paid out at the same time.

(Function) According to the multi-directional dispensing device for powder and granular materials of the present invention, even when powder and granular materials having a wide particle size distribution are stored in the storage tank, the powder and granular materials of various particle sizes smoothly pass through the discharge port. Once the powder is deposited on multiple slopes in the lower branch of the discharge chute, the discharge path is sealed to maintain the pressure difference between the storage tank side and the discharge pipe side, and the powder deposited on each slope is The angle of repose of the granules is broken by a carrier gas intermittently blown into the horizontal pipe in the discharging direction, and the granules are discharged from the discharge pipe, and the pulse interval at which the carrier gas is blown is changed. By doing so, it is also possible to adjust the amount of powder and granular material to be dispensed.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view showing the dispensing device of the present invention. In the figure, reference numeral 1 denotes a storage tank, which consists of a tank having an inverted conical shape near the bottom, and a powder outlet 2 is provided at the center of the bottom of the storage tank 1. Note that the hole diameter d of the discharge port 2 is set to a size that allows the powder and granular material having the largest particle size among the powder and granular material supplied to the storage W11 to sufficiently pass therethrough.

Reference numeral 3 denotes a discharge chute extending downward from the discharge port 2. At the lower end of the discharge chute 3, base ends of two horizontal pipes 4 branching in opposite directions are connected to the discharge chute 3.
Each horizontal pipe 4 has a discharge pipe 5 extending downward from its tip end.

Further, the base end portion of each of the horizontal pipes 4 is formed into an inclined surface 4a whose downward direction is inclined toward the distal end discharge pipe 5 side. The angle of inclination β of this inclined surface 4a is set to be greater than or equal to the angle of repose α to prevent the granular material from stagnation, and the height h of the inclined surface 4a is set slightly larger than the inner diameter of the horizontal pipe 4. It is set low. Furthermore, the inner diameter and length (more precisely, the length of the lower surface) of the horizontal pipe 4 are such that the powder from the discharge port 2 is deposited on the lower surface of the horizontal pipe 4, forming an inclined surface with an angle of repose α. Each is set so that

Reference numeral 6 denotes a carrier gas blowing nozzle, and one or more nozzles 6 are arranged on the inclined surface 4a toward the front (horizontal direction).

Reference numeral 7 denotes a pulse valve that can be opened at a precise interval (opening time is usually less than 1 second), and the nozzle 6 is
A carrier Φ gas supply source 8 is connected to the carrier Φ gas supply source 8. Note that 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 and granules with a wide particle size distribution are stored in the storage tank i, the powder and granules of various particle sizes pass through the discharge port 2 at the bottom, and the discharge chute 3 It is deposited on each inclined surface 4a of the branch section below. In this state, the powder discharge path is sealed with the powder, and the pressure difference between the storage tank 1 and the discharge pipe 5 is maintained. Here, by intermittently blowing carrier gas from the nozzle 6 of the horizontal pipe 4 in the direction in which the powder and granules are to be discharged, the powder and granules can be discharged to the discharge pipe 5 on the tip side. By blowing carrier gas from the nozzles 6 of the horizontal pipes 4 on both sides, 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, the amount of powder particles to be delivered can be adjusted.

Next, FIG. 2 shows a dispensing device showing another embodiment of the present invention. This device is different from the above embodiment in that three horizontal pipes 4 are provided at the lower end of the discharging chute 3 in the radial direction. By arranging them in series, powder and granules can be discharged in three directions.

Incidentally, the angle γ in the circumferential direction between the horizontal pipes 4 adjacent to each other is preferably set to 90° or more so that the carrier gas blown out from the nozzle 6 of the horizontal pipe 4 of l is deposited in the other horizontal pipe 4. Avoid affecting the powder or granules. In the drawings, constituent members common to those in the first embodiment are indicated using the same reference numerals as in FIG. 1.

Next, FIG. 3 shows a transport path diagram of ore from the preliminary reduction furnace to the smelting reduction furnace in the reduction process of ore containing metal oxides, 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 granular ore pre-reduced in the discharge chute 2
3 is deposited on the inclined surface 24a in the lower end branch, and is supplied to one 33^ of the two weighing tanks 33A, 33B via one horizontal pipe 24A and the discharge pipe 25A, and has already been deposited on the other horizontal pipe 24!1 and From the other weighing tank 338 to which ore was supplied through the discharge pipe 25m, an L valve pipe 34B is connected.
The pre-reduced ore is weighed and charged into the lower smelting reduction furnace 35 through the smelting reduction furnace 35. When the ore in the weighing tank 33B becomes empty, the pre-reduced ore is weighed and charged into the smelting reduction furnace 35 below through the weighing tank 33^ to which ore was supplied through the mustard valve pipe 34^. be done.

In this way, by alternately discharging the ore pre-reduced in the pre-reduction furnace 21 to the two weighing tanks, the pre-reduced ore can be continuously charged into the melting reduction furnace 35 while being weighed. In addition, when such high-temperature ore is used for dispensing, it is necessary to provide a refractory material to the ore transfer path including the dispensing device.

(Effects) According to the multi-direction dispensing device for powder and granular materials of the present invention configured as described above, the following effects are brought about.

(1) Powder having a wide particle size distribution can be discharged from the storage tank in multiple directions selectively or simultaneously.

(2) Since the carrier gas is intermittently blown in to blow out the powder and granules, the conveying force acts on the powder and granules more effectively than in a method in which gas is continuously blown in.
Powder can be effectively discharged with a small amount of gas,
Furthermore, by changing the gas blowing interval, it is also possible to adjust the amount of powder and granular material delivered.

(3) Due to the effect of (1) above, for example, ore with a wide particle size distribution, which is used as a raw material for iron manufacturing, is directly charged into a pre-reduction furnace without pre-treatment such as sieving or crushing, and is pre-reduced. This pre-reduced ore can be alternately discharged into two or more weighing tanks and continuously charged into the smelting reduction furnace while being weighed.

(4) The powder and granules in the storage tank can be discharged from the branch at the lower end of the discharge chute via multiple horizontal pipes in multiple directions within the same horizontal plane, making it easy to use when installing multiple weighing tanks, etc. Space is kept to a minimum.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a first embodiment of the dispensing device of the present invention, FIG. 2 is a cross-sectional view showing a second embodiment of the dispensing device of the present invention, and FIG. A diagram of the ore transfer route from the preliminary reduction furnace to the smelting reduction furnace in the reduction process of ore containing metal oxides, equipped with the dispensing device of the embodiment, and Fig. 4 is a conventional general powder dispensing device. FIG. DESCRIPTION OF SYMBOLS 1... Storage tank, 2... Discharge port, 3... Discharge chute, 4... Horizontal pipe, 4a... Inclined surface, 5... Discharge pipe, 6... Blow nozzle, 7...Pulse valve, 8...
・Carrier gas supply source.

Claims (1)

[Claims] A multi-directional dispensing device for discharging powder and granular material in a storage tank into a plurality of containers having a pressure difference therebetween, the device having a radial direction at the lower end of a discharge chute extending downward from a discharge port at the bottom of the storage tank. Install multiple horizontal pipes that branch into each other,
A discharge pipe is provided at the tip of each horizontal pipe to extend downward, and an inclined surface is provided in the lower end branch of the discharge chute with a downward slope toward the discharge pipe side of each horizontal pipe, and a carrier gas is provided on each inclined surface. A carrier gas supply source is connected to each nozzle via a pulse valve, and the powder and granules deposited near each of the slopes are removed by the intermittently blown carrier gas. A multi-directional dispensing device for powder and granular material, characterized in that the dispensing device selectively or simultaneously dispenses powder and granules into a discharge pipe.