KR101538850B1 - Electroststic separation unit of double conveyor type and electroststic separation device using the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual conveyor type electrostatic separating unit for sorting ash from coal into coal for Pulverized Coal Injection (PCI) in a differential state used for iron making, and a electrostatic separator using the same. The electrostatic separating unit according to the present invention is a electrostatic separating unit for sorting first and second charged materials charged with different polarities and has a first belt driven in an endless track manner and held on the first belt, A lower conveyor for conveying the first material and the second material and having a first electrode body having polarity added to the inside of the first belt to attach the first material to the first belt by electrostatic force; A second electrode body disposed on the lower conveyor and driven in an endless track manner and having a polarity different from that of the first electrode body is provided in the second belt, And a top conveyor for attaching the transferred second material to the second belt by electrostatic force.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a double conveyor type electrostatic separating unit and an electrostatic separator using the same.

The present invention relates to a double conveyor type electrostatic separating unit and a electrostatic separator using the same. More particularly, the present invention relates to a double conveyor type separator for extracting ash from a coal for pulverized coal injection (PCI) An electrostatic separation unit, and a electrostatic separator using the electrostatic separation unit.

Coal is one of the most abundant fossil fuels on the planet, and as of 2010, about 30% of the world's energy is supplied by coal.

However, in recent years, the continuous rise in oil prices, the increase in demand for coal in China and India, and the increase in demand for steel have led to a steady increase in coal consumption worldwide. In addition, the price of coal has continued to rise, There is a growing interest in the development of technologies to increase the efficiency of coal utilization.

The most important problem to increase efficiency in coal utilization is to remove moisture and ash from the coal. Especially, the ash contained in coal is melted at high temperature as an inorganic component and then fused to the surface of the combustor or heat exchanger to lower the heat transfer and mass transfer efficiency, thereby reducing the overall process efficiency and causing environmental pollution when discharged to the outside.

It is generally known that dry electroporation techniques used for coal sorting are effective when the particle size is 5 mm or more. It is known that pulverized coal having a particle size of 1 mm or less is virtually impossible to be activated by dry operation.

On the other hand, coal used in steel mills includes bituminous coal for coke production, pulverized coal injection (PCI) coal, and sintered anthracite. Particularly, the charcoal for PCI is a coal used for pulverizing and pulverizing coal and supplying the heat to the blast furnace as it is charged through the blast furnace. The level of crushing and calorie level is very important because the burnts for PCI must burn well in a short time.

A general coal sorting process is mainly used for non-specific sorting using spiral, jig, and heavy liquid, and wet processing such as floating sorting using a catcher and foaming agent. In the case of the wet treatment process, the process is complicated and the cost for the sorting is increased because recycling of the used water and the additional process for treating the wastewater and the dehydration and drying process for removing moisture of the selected coal concentrate are required. However, since coal is an inexpensive energy minerals, it is necessary to develop a treatment technology for dry selection in order to economically extract it.

Recently, a fluidized bed dry weight sorter using air has been developed and used for a case where the size of coal particles is relatively large, 5 mm or more. However, there is no commercialized technology for effectively dry-pulverizing pulverized coal having a particle size of 1 mm or less. Therefore, most of the pulverized coal is processed by wet sorting such as floating sorting.

However, it is known that it is possible to dry-sort pulverized coal as an experimental result, and a representative method is electrostatic sorting technology. Electrostatic separation is largely divided into electrostatic induction type, corona discharge type, and frictional charge type.

The electrostatic induction type is a method of separating a conductor product and a non-conductor product. When a mixed sample is electrostatically induced, a conductor is induced and a non-conductor product is not induced.

The corona discharge type is the same as the electrostatic induction type by separating the mixed conductor and the non-conductor product. However, the principle of separating the conductor non-conductor by discharging the corona in the air into the grounded roll, have.

The friction drag type is a technique of removing the ash from the fine coal particles by using the difference of the work function between the sample and the lower part, and the coal particles and the ash particles are frictioned with each other, The charged particles are passed between the anode plate and the anode plate, and the positively charged particles move toward the cathode plate and the negatively charged particles move toward the cathode plate.

Therefore, in order to select ash from coal, it is possible to use electrostatic sorting of friction lowering type. The electrostatic sorting of friction lowering type is specifically known in "Friction Down Electrostatic Separator (Patent Registration No. 10-0974206)".

However, in the case of the friction-type electrostatic separation, the effect is excellent for coal having an ash content of 30% or more when applied to pulverized coal having a particle size of 1 mm or less. However, It is known that the selection efficiency of ash is low due to a higher probability of friction with each other.

Patent No. 10-0974206 (Jul. 30, 2010)

The present invention provides a double conveyor type electrostatic separating unit for effectively removing ash from quartz and clay minerals from fine coal having a particle size of 1 mm or less and ash content of 20% or less and a electrostatic separator using the same.

The double conveyor type electrostatic separation unit according to an embodiment of the present invention is a unit for electrostatic separation for sorting first and second charged materials charged with different polarities and includes a first belt driven in an endless track manner, A first electrode body on which a first material and a second material are carried and which is polarized inside the first belt and which is attached to the first belt by electrostatic force, A conveyor; A second electrode body disposed on the lower conveyor and driven in an endless track manner and having a polarity different from that of the first electrode body is provided in the second belt, And a top conveyor for attaching the transferred second material to the second belt by electrostatic force.

Wherein the lower conveyor is connected to a pair of lower driving shafts so that the first belt is driven in an endless track manner and the first electrode body is disposed between the pair of lower driving shafts, A first deionizer is disposed in a front end region in a transport direction of the material, the upper conveyor is connected to a pair of upper drive shafts so as to be driven in an endless track manner, and between the pair of upper drive shafts, And a second deionizer is disposed in the tip region of the second region of the second belt in the transport direction of the second material.

The first belt and the second belt are preferably made of an electrically conductive material.

The upper conveyor may be provided with a tension axis for lifting the return portion of the second belt in the upper direction in the inner region of the second belt to maintain the tension of the second belt.

Meanwhile, the electrostatic separator according to an embodiment of the present invention is a electrostatic separator for separating a first material and a second material by electrostatic force, and the first material and the second material collide with the inner wall of the chamber to have different polarities A charging unit for charging; A lower conveyor and an upper conveyor, which are driven in an endless track manner so as to select and transport the first and second materials having different polarities charged; And a storage hopper disposed at an end of the sorting unit and attached to the lower conveyor and the upper conveyor to separately store the selected first material and second material.

The charging unit includes a chamber into which the first material and the second material are charged and charged; And a rotating body disposed inside the chamber and colliding the first material and the second material into the chamber with the inner wall of the chamber.

Wherein a sample supply part for injecting the first material and a second material is formed on the upper surface of the chamber, a sample discharge part for discharging the first material and the second material is formed on a lower surface of the chamber, Wherein the rotating body is rotatably mounted on a lower surface of the sample supply part, and the rotating body is attached to an upper surface of the rotating rotor and rotated integrally with the rotating rotor, And a blade for accelerating and colliding the second material to the inner wall of the chamber.

Preferably, the chamber is provided with a heater for controlling the temperature inside the chamber.

The sorting unit may include a first electrode body having a first belt driven in an endless track manner and carrying the first material and the second material on the first belt and having a polarity inside the first belt, A lower conveyor for attaching the first material to the first belt by electrostatic force; A second electrode body disposed on the lower conveyor and driven in an endless track manner and having a polarity different from that of the first electrode body is provided in the second belt, And a top conveyor for attaching the transferred second material to the second belt by electrostatic force.

Wherein the lower conveyor is connected to a pair of lower driving shafts so that the first belt is driven in an endless track manner and the first electrode body is disposed between the pair of lower driving shafts, A first deionizer is disposed in a front end region in a transport direction of the material, the upper conveyor is connected to a pair of upper drive shafts so as to be driven in an endless track manner, and between the pair of upper drive shafts, And a second deionizer is disposed in the tip region of the second region of the second belt in the transport direction of the second material.

The first belt and the second belt are preferably made of an electrically conductive material.

Wherein a leading end region in the conveying direction of the second material in the upper conveyor extends to a region deviating from a leading end region in the conveying direction of the first material in the lower conveyor, It is preferable that the first storage portion is disposed below the front end region of the lower conveyor and the second storage portion is disposed below the front end region of the upper conveyor .

The upper end of the partition wall is provided with a rotating wall for separating the first material and the second material and guiding the first storage portion and the second storage portion to an opened upper end of the partition, And is rotated to the upper end of the first storage unit or the upper end of the second storage unit.

According to the embodiment of the present invention, unlike the conventional friction type charging method, the impact type charging method is adopted to prevent the carbon from being rubbed against each other to prevent the charging efficiency from being lowered, and the work function value of the carbon and ash work function, the carbon and ash can be charged to have a high (+) or (-) charge density value, respectively. Therefore, even when the content of carbon and ash particles is small and the content of ash is low, it is possible to improve the charging efficiency and improve the sorting efficiency of ash.

Further, by providing the double-conveying type electrostatic separation unit, it is possible to continuously and massively sort the carbon and the ash.

1 is a view showing a configuration of a electrostatic separator according to an embodiment of the present invention,
FIG. 2 is a view showing a charging unit according to an embodiment of the present invention,
3 is a view showing a rotating body according to an embodiment of the present invention,
4 is an operational state diagram illustrating a electrostatic separator according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Wherein like reference numerals refer to like elements throughout.

The present invention relates to a technique for charging and electrostatically sorting a first material and a second material at different polarities in a mixture of a first material and a second material, desirable. In the present embodiment, carbon (first material) and fine powder (second material) are electrostatically sorted in a carbonaceous particle for PCI having a particle size of 1 mm or less. Of course, the present invention is not limited to the selection of carbon and fine particles in the charcoal for PCI, but may be variously applied to the electrostatic selection of a material having a relatively small particle size.

FIG. 1 is a configuration diagram showing a electrostatic separator according to an embodiment of the present invention. FIG. 2 is a view illustrating a charging unit according to an embodiment of the present invention. FIG.

As shown in FIG. 1, the electrostatic separator according to an embodiment of the present invention includes a charge unit 100, a sorting unit 200, and a storage hopper 300.

The charging unit 100 is a means for charging the carbon and the fine particles with different polarities by using the impact type. The charging unit 100 includes a chamber 110 for providing space for charging carbon and differential powder; And a rotating body 120 for colliding the carbon and the fine particles inside the chamber 110 to the inner wall of the chamber 110.

The chamber 110 is formed of a cylindrical body 111, for example, having a top surface and a bottom surface and surrounded by the side wall so as to form a space for moving carbon and fine particles therein. At this time, a sample supply unit 112 for injecting uncharged carbon and a fine powder is formed on the upper surface of the chamber 110. A sample discharge unit 114 for discharging the charged carbon and the fine powder by its own weight is formed on the lower surface of the chamber 110, .

A heater 113 for adjusting the temperature inside the chamber is provided outside the side wall of the chamber 110.

The rotating body 120 is provided on the lower surface of the chamber 110 and serves to charge the carbon and the differential particles by colliding the carbon and the differential charged into the sample supply unit 112 against the inner wall of the chamber 110, And is disposed directly below the sample supply part 112 in the inner space. For example, the rotating body 120 is rotatably disposed on the lower surface of the chamber 110.

The rotating body 120 is rotatably driven and is attached to the upper surface of the rotating rotor 121 and rotates integrally with the rotating rotor 121 so that the carbon and the differential powder, And a blade 122 that accelerates and collides with the inner wall of the outer casing 110.

The rotation rotor 121 is a means for rotating on a plane perpendicular to the direction in which the carbon and the fine particles are injected by a separate driving means. The rotation rotor 121 is provided with a rotation axis portion for connecting to another driving means (not shown) And a disc portion provided in an upper region of the rotary shaft portion. The distal end of the rotary shaft portion is formed with a conical dispersion portion 121a so that the falling carbon and the fine powder are uniformly dispersed in the disc portion.

The blade 122 is provided on the disc portion of the rotating rotor 121 and bounces the carbon and the differential powder by the rotation of the rotating rotor 121 and bounces to the inner wall of the chamber 110, A plurality of portions are radially arranged with respect to the rotary shaft portion.

Therefore, when the carbon and the powder fall down from the upper part while the blade 122 is rotated integrally by the rotation of the rotating rotor 121, the first and second charged particles collide with the blade 122 and the rotating rotor 121, And is secondarily charged while colliding with the inner wall of the chamber 110. Thus, the surface of carbon is charged with (-) polarity, and the surface of the derivative is charged with (+) polarity.

This reduces the friction between the specimens (carbon and fine powder) and promotes collision between the specimen and the rotating rotor 121 and the inner wall of the chamber 110, thereby improving the charging efficiency of the specimens.

The sorting unit 200 comprises a lower conveyor 210 and an upper conveyor 220, which are arranged in the upper and lower sides, respectively, as means for electrostatic sorting while conveying carbon and fine particles charged with different polarities. At this time, both the lower conveyor 210 and the upper conveyor 220 are driven in an endless track manner.

The lower conveyor 210 is a means for attaching and picking up the carbon charged to the negative polarity in the charging unit by adding positive polarity to the pair of lower driving shafts 211, And a first electrode unit 213 to which a (+) polarity is added is disposed between the pair of lower driving shafts 211. In addition, A first deionizer 214 is disposed in the front end region (the right side region of the first belt inner region in FIG. 1) in the direction in which carbon is transported in the inner region of the first belt 212. Thus, the first electrode body 213 and the first deionizer 214 are sequentially disposed in the direction in which the carbon is transported.

The upper conveyor 220 includes a pair of upper drive shafts 221 as well as the lower conveyor 210 as means for attaching and sorting charged particles charged with positive polarity in the charging unit 100 by adding a negative polarity, The second electrode body 223 is connected between the pair of upper drive shafts 221 so that the second belt body 222 is driven in an endless track manner. A second deionizer 224 is disposed in the front end region (the right side region of the second belt inner region in Fig. 1) in the direction in which the differential among the inner region of the second belt 222 is conveyed. Thus, the second electrode body 223 and the second deionizer 224 are sequentially disposed in the direction in which the differential is transferred. Meanwhile, in order to prevent the second belt 222 from being stuck to the upper conveyor 220 by its own weight, the upper portion of the second belt 222 is lifted up in the inner region of the second belt 222, A tension shaft 225 for holding the tension of the two belts 222 is disposed. Here, the return portion of the second belt 222 refers to a portion of the second belt 222 that is positioned at an upper portion with respect to the pair of upper drive shafts 221.

The first belt 212 and the second belt 222 are preferably made of an electrically conductive material so that the polarities of the first electrode body 213 and the second electrode body 223 are charged to the respective polarities, respectively Do.

The first electrode unit 213 and the second electrode unit 223 are preferably applied with a high voltage of 1 to 60 KV and the shapes of the first electrode unit 213 and the second electrode unit 223 may be wire mesh, , And a plate, but it is preferable to use a wire mesh shape in order to increase the sorting efficiency. In addition, the first electrode unit 213 and the second electrode unit 223 are fabricated in one or more numbers.

The first deionizer 214 and the second deionizer 224 are disposed at the ends of the first belt 212 and the second belt 222, respectively, so that the surfaces of the charged carbon and the derivative, Neutralize to eliminate polarity. So that the charged carbon and the fine particles respectively charged in the charging unit 100 are electrostatically adhered to the first belt 212 and the second belt 222 having polarities different from each other and transferred to the first deionizer 214 and the second belt 222. [ The surface is neutralized in the vicinity of the second deionizer 224 so that the adhesion force between the first belt 212 and the second belt 222 is lost.

The positions of the first deionizer 214 and the second deionizer 224 may be varied depending on the arrangement of the lower conveyor 210 and the upper conveyor 220 and the position of the storage hopper 300 It will be possible.

The arrangement of the lower conveyor 210 and the upper conveyor 220 can be variously arranged according to the content ratio of carbon and ash and mineralogical characteristics. For example, the parallel type, the incline type, the cross belt type (Cross belt type) or the like.

In this embodiment, as shown in FIG. 1, the lower conveyor and the upper conveyor are disposed in parallel to each other in a parallel type. At this time, in order to easily supply the carbon and the fine powder to the lower conveyor 210, the rear end region of the lower conveyor 210 extends to a region deviating from the rear end region of the upper conveyor 220, So that the rear end region is not obstructed by the upper conveyor 220.

In order to allow the selected fine particles to fall into the storage hopper 300 described below, the leading end region of the upper conveyor 220 in the conveying direction of the differential is extended to a region deviating from the leading end region of the lower conveyor 210, Is not obstructed by the lower conveyor 210.

The storage hopper 300 is disposed under the front end region of the sorting unit 200 and is attached to the lower conveyor 210 and the upper conveyor 220 to store the selected carbon and the differential while being distinguished from each other. Is divided into a first storage part 310 in which carbon is stored by the partition wall 330 and a second storage part 320 in which the differential is stored.

The first storage unit 310 and the second storage unit 320 are respectively opened to store the carbon and the fine particles falling from the lower conveyor 210 and the upper conveyor 220, respectively. The first storage unit 310 is disposed under the front end region of the lower conveyor 210 and the second storage unit 320 is disposed under the front end region of the upper conveyor 220.

At this time, at the upper end of the partition wall 330, a rotating wall 340 for separating the carbon and the differential and guiding to the opened upper end of the first storage part 310 and the second storage part 320 is provided. The rotation wall 340 is hingedly coupled to the upper end of the partition wall 330 to be pivoted to the upper end of the first storage unit 310 or the upper end of the second storage unit 320.

The operation of the electrostatic separator according to an embodiment of the present invention will now be described with reference to the drawings.

4 is an operational state diagram illustrating a electrostatic separator according to an embodiment of the present invention.

First, when the carbon and the fine particles are mixed into the chamber 110 through the sample supply unit 112, the carbon and the fine particles collide with the rotating rotor 121 and the blade 122, The carbon and the fine powder are hit by the rotational force of the rotating rotor 121 and the blade 122 and collide with the inner wall of the chamber 110 to perform secondary charging. At this time, carbon is charged to (-) polarity by the difference of work function of carbon and derivative, and charged to (+) polarity. At this time, in order to improve the charging efficiency, the heater 113 may be operated to maintain the inside of the chamber 110 at an appropriate temperature condition.

The carbon and the differential powder charged with different polarities are discharged through the sample discharging part 114 and fall on the first belt 212 of the lower conveyor 210 while being dropped by their own weight. At this time, the first electrode body 213 is positively charged using a high voltage, so that the first belt 212 is charged with a positive polarity. (-) polarity is added to the second electrode unit 223 using a high voltage, so that the second belt 222 is charged with a negative polarity.

The carbon is attached to the first belt 212 by electrostatic force while the fine particles are adhered to the second belt 222 while the carbon and the fine particles are carried on the first belt 212. [ The surfaces of the carbon and the fine particles are neutralized by the first deionizer 214 and the second deionizer 224, respectively, while being selectively transported by polarity.

Thus, the carbon is transferred with the adhesion force to the first belt 212 being lost, and dropped to the first storage part 310 of the storage hopper 300, and the powder is freely dropped and lost due to the adhering force to the second belt 222 The carbon and the derivative are selected and stored separately as they fall to the second storage part 320 of the hopper 300.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

100: Charging unit 110: Chamber
120: rotating body 200: sorting unit
210: Lower conveyor 220: Top conveyor
300: Storage hopper

Claims (13)

A electrostatic separation unit for selecting a first material and a second material charged with different polarities,
A first electrode body having a first belt driven in an endless track manner and carrying the first material and a second material carried on the first belt and having polarity added to the inside of the first belt, A lower conveyor for attaching the material to the first belt by electrostatic force;
A second electrode body disposed on the lower conveyor and driven in an endless track manner and having a polarity different from that of the first electrode body is provided in the second belt, And a top conveyor for attaching the transferred second material to the second belt by electrostatic force.
The method according to claim 1,
Wherein the lower conveyor is connected to a pair of lower driving shafts so that the first belt is driven in an endless track manner and the first electrode body is disposed between the pair of lower driving shafts, A first deionizer is disposed in the tip region in the material transport direction,
Wherein the upper conveyor is connected to a pair of upper drive shafts so that the second belt is driven in an endless track manner and the second electrode body is disposed between the pair of upper drive shafts, And a second deionizer is disposed in the tip region in the transport direction of the material.
The method according to claim 1 or 2,
Wherein the first belt and the second belt are made of an electrically conductive material.
The method according to claim 1,
Wherein the upper conveyor is provided with a tension axis for lifting the return portion of the second belt in the upper direction so as to maintain the tension of the second belt in the inner region of the second belt.
A electrostatic separator for sorting a first material and a second material by electrostatic force,
A charging unit for impinging the first material and the second material on the inner wall of the chamber and charging the first material and the second material to different polarities;
A first electrode body having a first belt driven in an endless track manner and carrying the first material and a second material carried on the first belt and having polarity added to the inside of the first belt, A lower conveyor for attaching the material to the first belt by electrostatic force; A second electrode body disposed on the lower conveyor and driven in an endless track manner and having a polarity different from that of the first electrode body is provided in the second belt, And a top conveyor for attaching the second material to be conveyed to the second belt by an electrostatic force, wherein the sorting unit selects and transports the first and second materials having different polarities;
And a storage hopper disposed at an end of the sorting unit and attached to the lower conveyor and the upper conveyor to separately store the selected first material and second material.
The method of claim 5,
The charging unit includes a chamber into which the first material and the second material are charged and charged;
And a rotating body disposed inside the chamber and colliding the first material and the second material to be introduced into the chamber into the inner wall of the chamber.
The method of claim 6,
A sample supply part for injecting the first material and a second material is formed on the upper surface of the chamber, a sample discharge part for discharging the first material and the second material is formed on a lower surface of the chamber,
Wherein the rotating body is disposed below the sample supply portion of the inner space of the chamber,
The rotating body is attached to an upper surface of the rotating rotor and rotated together with the rotating rotor so that the first material and the second material supplied through the sample supplying part are accelerated to collide with the inner wall of the chamber A screening machine comprising a blade.
The method of claim 6,
Wherein the chamber is provided with a heater for controlling the temperature inside the chamber.
delete The method of claim 5,
Wherein the lower conveyor is connected to a pair of lower driving shafts so that the first belt is driven in an endless track manner and the first electrode body is disposed between the pair of lower driving shafts, A first deionizer is disposed in the tip region in the material transport direction,
Wherein the upper conveyor is connected to a pair of upper drive shafts so that the second belt is driven in an endless track manner and the second electrode body is disposed between the pair of upper drive shafts, And a second deionizer is disposed in the tip region in the transport direction of the substance.
The method according to claim 5 or 10,
Wherein the first belt and the second belt are made of an electrically conductive material.
The method of claim 10,
The leading end region in the conveying direction of the second material in the upper conveyor extends from the leading end region in the conveying direction of the first material in the lower conveyor,
Wherein the storage hopper is partitioned into a first storage part in which the first material is stored by the partition wall and a second storage part in which the second material is stored, the first storage part being disposed below the front end area of the lower conveyor, 2 storage unit is disposed under the front end region of the upper conveyor.
The method of claim 12,
And a rotating wall for dividing the first material and the second material from the upper end of the partition wall and guiding the first and second storage portions to the opened top of the second storage portion,
Wherein the pivoting wall is hingedly coupled to an upper end of the partition wall to be pivoted to an upper end region of the first storage unit or an upper end region of the second storage unit.

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