KR20170064588A - Apparatus for simulating entrainment of fine ore in rotary kiln - Google Patents

Abstract

In the rotary kiln, a non-mass ore simulation apparatus for a differential ore includes: a screw feeder for inputting a differential ore; a gas supply for controlling a speed of a supplied gas; and a differential ore And may include collectors that collect by scattered distances.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for simulating the distribution of fine ore in a rotary kiln,

The present application relates to an apparatus for simulating the fractional amount of a differential ore in a rotary kiln.

Indirect heating for heat treatment of ores, such as drying, calcining or reducing, uses a high temperature gas as a heat source or reaction gas in rotary kiln. When such a high temperature gas is discharged from the rotary kiln, it contains an ore in a differential state to be subjected to a heat treatment.

Particularly, in the case of a rotary kiln using hydrogen as a reducing gas, the hot exhaust gas contains water vapor, acid gas and non-acid dust (dust). In addition, since excess hydrogen is used to promote the reduction reaction, it is possible to remove water vapor, acid gas and non-acid light from the excess hydrogen and reuse it.

The rotary kiln 10 used for drying / calcining the ore is generally constructed by using the cyclone 20 and the bag filter 30 to remove scattered light (dust) contained in the flue gas, Collect. And may further include De-SOx or De-NOx equipment 40 depending on whether environmental treatment is specified or not. The collected dust is sent to the drying process and put into rework.

On the other hand, as shown in FIG. 1B, as the rotary kiln 10 rotates, the differential ore is moved from the lower part to the upper part and the differential ore is dropped from the upper part (hereinafter referred to as 'dumping' The rotary kiln 10 is provided with a lifter 11 protruding from the inner wall of the rotary kiln 10 in order to mix the ore and the ore not subjected to the reduction reaction. Such a dumping action of the lifter 11 causes the differential ore 12 to be scattered by the introduced gas.

Therefore, when the amount of scattered light is excessive, the capacity of the collection facility is increased, and the amount of ore discharged from the rotary kiln is reduced, so that the capacity of the rotary kiln increases to satisfy the production amount. As a result, the amount of energy consumed per unit production amount increases.

Korean Prior Art No. 2013-0076554 ('Method and Apparatus for the Recovery of Hydrogen in a Nickel Wet Smelting Process', published on Jul. 08, 2013) is a related art.

1. Korean Patent Laid-Open Publication No. 2013-0076554 ('Method and Apparatus for the Recovery of Hydrogen in a Nickel Wet Smelting Process', Disclosure Date: Jul 08, 2013)

According to one embodiment of the present invention, there is provided a scattering apparatus for a reduced amount of fine ore in a rotary kiln capable of reducing the capacity of a non-acid trap facility and reducing energy consumption per unit production amount.

According to an embodiment of the present invention, there is provided a method of manufacturing a honeycomb structure, comprising: a screw feeder for inputting a fine ore; A gas supply part for controlling the speed of the supplied gas; And a collecting device for collecting the scattered ore by the scattered distance when the charged ore is charged by the supplied gas, and a scattering device for collecting the scattered ore by the scattered distance.

According to the embodiment of the present invention, the non-mass-quantity simulation apparatus determines the distance from the gas outlet of the rotary kiln to the lifter to be formed in the rotary kiln, based on the amount of the collected ore collected in each of the collectors .

According to the embodiment of the present invention, the non-mass-quantity simulation apparatus may further include a housing in which the collectors are arranged in a line on the bottom surface along the gas supply direction, and a gas outlet for discharging the supplied gas is formed have.

According to the embodiment of the present invention, the screw feeder is installed on the upper portion of the housing and feeds the differential ore in a downward direction, and the gas control unit is capable of supplying the gas along the longitudinal direction in which the collectors are arranged in a row have.

According to an embodiment of the present invention, the housing may be made of a transparent material.

According to one embodiment of the present invention, the scattering amount of the scattered ore scattered through the rotary kiln simulating apparatus is simulated and reflected in designing the distance from the gas outlet of the rotary kiln to the lifter, thereby reducing the capacity of the non- And energy consumption per unit output can be reduced.

1A is a view for explaining a facility for collecting gas and dust from an exhaust gas scattered in a rotary kiln.
FIG. 1B is a view for explaining a differential ore scattered in the rotary kiln. FIG.
2 is a diagram showing a non-mass-quantity simulation apparatus for a fine ore according to an embodiment of the present invention.
FIG. 3 is a three-dimensional diagram showing the non-mass-quantity simulation apparatus of the fine ore in FIG.
Fig. 4 is a view showing a force and locus acting on a differential ore. Fig.
5 is a view showing the amount of collected fine ore according to the angle.
Fig. 6 is a view showing a mounting position of a lifter in a rotary kiln according to a result of a non-mass-quantity simulation apparatus according to an embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. The shape and the size of the elements in the drawings may be exaggerated for clarity and the same elements are denoted by the same reference numerals in the drawings.

2 is a diagram showing a non-mass-quantity simulation apparatus for a fine ore according to an embodiment of the present invention. And FIG. 3 is a three-dimensional diagram showing the non-mass-quantity simulation apparatus of the fine ore in FIG.

2 and 3, the non-mass metering apparatus 200 of a differential ore may include a screw feeder 210, a gas supply unit 220, a plurality of collectors 231, and a housing 230 have.

Hereinafter, the structure and operation principle of the non-mass-quantity simulation apparatus 200 for fine ore according to one embodiment of the present invention described above with reference to FIGS. 2 to 3 will be described in detail.

2 and 3, the screw feeder 210 is for injecting the fine ore into the interior of the housing 230 by rotationally driving the screw disposed inside the housing 230, So that the fine ore 202 can be introduced in the downward direction.

The gas supply unit 220 controls the speed of the supplied gas and controls the flow rate of the gas along the longitudinal direction in which the collectors 231 are arranged in a line from one side of the housing 230 to the other side Can be supplied. The fine ores 202 injected from the screw feeder 210 by the supplied gas can be scattered and collected by the collectors 231. [ The above-mentioned gas may include hydrogen used as a reducing gas in a rotary kiln, but various gases such as nitrogen may be used.

Meanwhile, the collectors 231 collect the fine ore scattered by the scattered distance when the fine ore inputted from the screw feeder 210 is scattered by the gas 201 supplied by the gas supplying unit 220 . These collectors 231 may be arranged in a line on the bottom surface inside the housing 230 along the supply direction of the gas 201. The collector 231 may be formed such that the interior thereof is recessed so as to collect the fine ores scattered as in a dish, for example.

The housing 230 may be in the form of a hexahedron having a constant length and an empty interior space. More specifically, collectors 231 may be arranged in a row on the bottom surface along the feeding direction of the gas 201, and a screw feeder 210 may be installed on the upper portion. The gas 201 is supplied from one side of the housing 230, and the supplied gas 201 can be discharged through the gas outlet 232 formed at the other side. The housing 230 may be made of a transparent material such as acrylic resin so that the housing 230 can be seen from the outside. The outer shape of the housing 230 may be various shapes such as a cylindrical shape other than a hexahedron, and the material may be made of an opaque material such as a steel sheet.

On the other hand, FIG. 4 shows the force and locus acting on the fine ores.

As shown in FIG. 4, the trajectory can be determined according to the resultant force of the drag force F_force and the gravity Fg, which are received by the gas supply.

The force Fgas received by the gas supply can be determined according to the following equation (1).

[Equation 1]

Where μ _gas is the viscous coefficient of the gas, Dore is the size of the ore and Vgas is the velocity of the gas.

The falling velocity V of the ore fine ore 202 can be expressed by the following equation (2) by the resultant force of the drag force Fgas and the gravitational force Fg received by the gas supply.

&Quot; (2) "

Dore is the size of the ore, g is the gravitational acceleration, ρ _ore is the density of the ore, ρ _gas is the density of the gas, and μ _gas is the viscosity coefficient of the gas.

In other words, if the drag force given by the gas supply is dominant, it will fly away. If the drag force is small, it will fly short distance. The viscosity of a gas is dominant to the composition and temperature of the gas but is not controlled by considering the reaction gas composition and temperature distribution of the reduction reaction in the rotary kiln. The size of the particles affecting the drag is also the treated ore, so the velocity of the gas can be controlled, not the object of control. However, in a rotary kiln, a minimum flow rate is required to promote the reduction reaction, and setting the flow rate within this range also determines the gas velocity. Therefore, it is possible to quantify the amount of ore that is eventually scattered by quantitatively determining the trajectory of the fine ore at the determined gas velocity, that is, how long it flies in the direction of the flow and then falls back into the tube.

FIG. 5 is a graph showing the amount of collected ore aggregates in accordance with angles, wherein the velocity of the supplied gas is changed to 0.5, 0.75, 1.0 and 1.5 m / s (sequentially refer to 501 to 504) The horizontal axis represents the angle (see? In Fig. 2) to a specific point in the gas supply direction with respect to the screw feeder 210, and the vertical axis represents the total amount of the differential ores collected to the specific point.

Experimental results show that 98% of the ore charged up to 12 ° C is collected when the gas velocity is 1.0 m / s (see 503). This means that the remaining 2% will be scattered beyond 12 degrees.

6 shows a distance L between the lifter 11 and the gas outlet 13 in the actual rotary kiln 10 for minimizing the amount of scattering based on the experimental data of Fig. 5, reference numeral 10 denotes a rotary kiln, 11 denotes a lifter, 13 denotes a gas outlet, 14 denotes a raw material (differential ore) supply unit, and 201 denotes a supplied gas.

5 and 6, the angle for minimizing the scattered amount of the ore powder can be set with reference to the lifter 11, and based on the angle? Of the experimental data in FIG. 5, Can be used to calculate the distance (L) from the gas outlet (11) to the gas outlet (13).

As described above, according to the embodiment of the present invention, the scattering amount of the ore scattered through the simulator of the rotary kiln is simulated and reflected in the design of the distance from the gas outlet of the rotary kiln to the lifter, It is possible to reduce the capacity of the facility and reduce the energy consumption per unit production amount.

The present invention is not limited to the above-described embodiments and the accompanying drawings. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be self-evident.

10: Rotary kiln 11: Lifter
14: raw material supply part 200: non-scattering light modulating device
201: gas 202: scattering light
210: screw feeder 220: gas supply part
230: housing 231: collector
13, 232: gas outlet

Claims (5)

A screw feeder for introducing a fine ore;
A gas supply part for controlling the speed of the supplied gas; And
And a collector for collecting the scattered ore by the scattered distance when the charged ore is charged by the supplied gas.
The method according to claim 1,
The non-mass-
Wherein the distance from the gas outlet of the rotary kiln to the lifter to be formed in the rotary kiln is determined based on the amount of collected ore collected in each of the collectors.
The method according to claim 1,
The non-mass-
Further comprising a housing having the collectors arranged in a line along the supply direction of the gas and having a gas outlet for discharging the supplied gas.
The method of claim 3,
Wherein the screw feeder is installed on the upper portion of the housing to feed the differential ore in a downward direction,
Wherein the gas control unit is configured to supply the gas along a longitudinal direction in which the collectors are arranged in a line.
The method of claim 3,
The housing includes:
A non-mass transfer device for a differential ore in a rotary kiln made of a transparent material.

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