JP3376338B2 - Helical screw type high efficiency dust charging device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter cloth for collecting a large amount of dust particles discharged from a dust generation process such as a combustion process of heavy oil and pulverized coal, an incineration process of waste, a cement manufacturing process and an iron and steel manufacturing process. The present invention relates to a dust collector and a dust charging device. In particular, the electrostatic attraction is applied to the dust particles flowing into the filter cloth dust collector to improve the efficiency of collecting fine dust particles from the filter cloth dust collector. The present invention also relates to a dust charging device that can induce the formation of a dust layer having a large porosity on the surface of the filter cloth and reduce the pressure loss of the filter cloth dust collector.

[0002]

2. Description of the Related Art Generally, in industries in which a large amount of dust is discharged, an electric dust collector and a filter cloth dust collector are usually used to collect and remove discharged dust particles. In particular, the electric dust collector is mainly used in the process of treating a large amount of combustion gas, and the filter cloth dust collector is mainly used in the industry of treating small and medium doses of combustion gas and dust-containing gas. .

However, at this time, the fuel used for satisfying the regulation value of air pollution is gradually changing to low-sulfur fuel, and the dust collecting performance by the electric dust collection is drastically lowered. As a result, the possibility of switching to a filter cloth dust collector, which is more stable than the electric dust collector and is expected to have high dust collection efficiency, was recognized.

However, even in the case of the filter cloth dust collector, the dust collection efficiency for fine dust particles is low in spite of the high dust collection rate, and the dust layer collected on the filter cloth becomes thicker, resulting in a pressure loss of the filter cloth. Since it becomes higher, the dust removal operation (c
There is a problem that requires leaning). In particular, application of excessive dust-removing conditions lowers the dust-collection efficiency and causes wear and damage to the filter cloth, resulting in shortening the life. Further, due to such a problem of pressure loss, it is the current situation that the filtration rate must be reduced.

In order to fundamentally solve the problems of such a filter cloth dust collector and maintain a high dust collecting efficiency, an electrostatic force is applied to inflowing dust particles to collect fine particles. Has been developed and used to increase the pressure drop and reduce the pressure loss on the surface of the filter cloth.

The conventional dust charge filtration dust collector is a single charging system having a dust charging part in which a flat ground electrode is assembled separately from a wire-shaped discharge electrode having a wire or a protrusion and a dust collector. Has become commonplace.

[0007]

DISCLOSURE OF THE INVENTION As described above,
The conventional dust charge filtration dust collector for solving the problems of the filter cloth dust collector requires a separate equipment having a discharge electrode and a ground electrode as a dust charging device. Further, in order to prevent the wire discharge electrode from bending and to keep the distance between the discharge electrode and the ground electrode constant, tension must be applied in the axial direction of the wire. For this reason, additional equipment is required, and over time, the discharge electrode is more likely to be damaged due to fatigue and corrosion. This causes a danger such as a fire due to an electrical short. Further, the electric discharge is concentrated on an arbitrary protruding portion, so that the wire-type discharge electrode cannot form a constant and strong electric field. Recently, a method has been used in which many protrusions such as spines are formed on a wire to form a uniform and strong electric field. However, this also cannot exceed the limit of the wire type discharge electrode. .

An object of the present invention is to eliminate the above-mentioned problems and to charge dust with low power consumption with high efficiency.
Helical Screw Type High Efficiency Dust Charger (Helical Screw Type High Efficiency) with the shape and structure of discharge electrode and grounding electrode that can minimize installation cost and installation area
Dust Ionizer).

[0009]

To achieve the above objects resolving means for the ## invention of claim 1, wherein, in the dust charging device for charging the dust particles discharged from the step of dust is generated, the dust particles A dust discharging device for discharging,
Helical screw installed between filter cloth dust collectors
Type high efficiency dust charging device, said charging device
Is a corona having a cylindrical ground electrode that functions as a duct and a helical screw blade that is installed inside the cylindrical ground electrode and that charges dust particles. It is a helical screw type high-efficiency dust charging device characterized by being composed of a discharge electrode. As a result, the charging efficiency can be improved even if there is no separate space due to dust charging.

According to a second aspect of the present invention, the corona discharge electrode having the helical screw blades is supported by a center rod penetrating a cruciform heat-resistant insulating support installed at both inner ends of the cylindrical ground electrode. The helical screw type high efficiency dust charging device according to claim 1.

According to a third aspect of the present invention, the center rod supporting the corona discharge electrode having the helical screw blade is provided with a flow guide cone for guiding the flow of dust particles at the end on the dust discharging device side, and the opposite. A high-efficiency dust charging device of the helical screw type according to claim 2, wherein a high-voltage lead-in wire is connected to the end of the.

The invention according to claim 4 is characterized in that a plurality of auxiliary wire type discharge electrodes are installed around the corona discharge electrode (3) having the helical screw blades. This is a high-efficiency dust charging device of the type.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail with reference to the following drawings. Referring to FIGS. 1 to 6, a helical screw type dust charging apparatus according to a preferred embodiment of the present invention generates dust in a heavy oil and pulverized coal combustion process, a waste incineration process, a cement manufacturing process or an iron and steel manufacturing process. A duct for passing a fluid containing dust between a dust discharging device (not shown) for discharging dust from the process and a filter cloth dust collecting device (not shown)
(Cylinder) grounding electrode that has the function of (duct) and the function of a charging device that applies electrostatic force to the dust discharged with it.
It consists of (4) and a helical screw type discharge electrode installed inside it. In this way, the cylindrical ground electrode (4) has the function of a duct through which the fluid containing dust passes, so to prevent dust from accumulating inside the cylindrical ground electrode (4), the vertical It is desirable to install it on the ground (that is, in the hopper direction).

At both ends inside the cylindrical ground electrode (4), cross-shaped insulating supports (2) made of an insulating material such as Teflon which can withstand relatively high temperature are installed. To be done. This insulating support (2), as shown in FIG.
Teflon with a coupling groove with a through hole in the middle
Lon) support rods are assembled in a form intersecting each other at right angles (see FIG. 5). Between the cross-shaped insulating supports (2) installed on both ends inside the cylindrical grounding electrode (4), insert the center rod (7) into the center of the cross-shaped insulating supports (2) on both sides. Install through the hole. As shown in FIGS. 1 and 4, the center rod (7) is provided with a flow guide cone (1) at its tip, and a high voltage lead-in line (6) is connected to the opposite side. With this,
Between the cross-shaped insulating supports (2) on both sides, the helical screw type corona discharge electrode (3) by the center rod (7) is supported and installed.

The flow guide cone (1) is a cylindrical ground electrode.
A function that smoothes the flow of air containing dust particles flowing in from (4) by colliding with the helical screw type corona discharge electrode (3) at a right angle without colliding at a right angle. A screw-type groove is formed in the flow guide cone (1) so that the fluid containing dust particles can flow into the helical screw-type corona discharge electrode (3) while hitting it in a spiral shape. It is thought to be possible.

Further, the helical shown in FIG. 1, FIG. 3 and FIG.
The screw type corona discharge electrode (3) uses a material such as stainless steel, which has high corrosion resistance and heat resistance against the high temperature fluid containing dust particles and corrosive impurities discharged from the dust discharge process. It is desirable to manufacture it.

On the other hand, the high voltage lead-in wire (6) is connected to a current supply device (not shown) installed outside.

With the above structure, when the fluid containing the dust particles discharged from the dust discharging process passes through the cylindrical ground electrode (4) having the duct function, the helical screw type corona Since it goes through the discharge electrode (3), the above helical screw type corona discharge electrode
It passes through the cylindrical ground electrode (4) while rotating around the axis of (3). With such a configuration of the helical screw type corona discharge electrode (3), a uniform magnetic field can be formed inside the cylindrical ground electrode (4).

A fluid containing the above dust particles is
Since it passes while rotating around the axis of the helical screw type corona discharge electrode (3), it repeatedly passes through the corona discharge electrode region formed by the helical screw type corona discharge electrode (3). Therefore, the charge rate for dust particles is improved. Also, due to the above-mentioned rotation passage, the fluid flow forms a strong turbulent flow, that is, a vortex flow. Therefore, the charging efficiency for dust particles is further improved than when the fluid flows in a laminar flow.

The dust particles in the charged state as described above flow into the filter cloth dust collector and are aggregated by mutual electric forces to form a dust layer on the surface of the filter cloth. The dust layer thus formed has a porous resin-like structure.

Since the above dust layer has a porous resin-like structure, the gap between the dust particles, that is, the porosity becomes large. Therefore, the pressure loss due to the dust layer is low.

Further, since the dust particles are aggregated to form a dust layer, the permeation of the dust particles into the filter cloth can be reduced, and in addition to blocking or inertial collision to collect the dust particles, an electric attraction force is also applied. Is added, the collection efficiency for fine dust particles can be increased.

On the other hand, around the helical screw type corona discharge electrode (3) installed between the cross-shaped insulating supports (2) on both sides, an auxiliary wire in a wire form as shown in FIGS. 1 and 3 is formed. By installing a plurality of discharge electrodes (5), the density of corona discharge electrodes can be increased and the charging efficiency for dust particles can be further improved.

When the above-mentioned auxiliary wire discharge electrode (5) is installed in contact with the cylinder of the helical screw type corona discharge electrode (3), the helical wire type corona discharge electrodes (3) at both ends are connected. It can be located in a straight line or it can be installed with a spiral twist.

The present invention is not limited to the above-described embodiments, and modifications and the like can be added without departing from the technical idea of the present invention. Items and the like are also included in the technical scope of the present invention.

[0026]

According to the present invention, the fluid containing dust particles passing through the cylindrical ground electrode repeatedly passes through the corona discharge electrode region while forming a strong vortex, and the dust particles are consumed with low power consumption. It is possible to obtain high charging efficiency.

Further, since the charging efficiency for dust particles is increased and a dust layer having a large porosity is formed, the pressure loss of the filter cloth can be kept low, and therefore the number of times the dusting operation is performed on the filter cloth is reduced. The operation cost and maintenance cost of the filter cloth dust collector can be reduced by extending the life of the filter cloth.

Further, since the dust charging device of the present invention has a simpler structure than the conventional dust charging device and can be directly applied to the conventional dust collecting facility, no additional installation cost is required and the installation space can be saved.

[Brief description of drawings]

FIG. 1 is a helical screw according to the present embodiment.
FIG. 1 is a partial cross-sectional view schematically illustrating a preferred embodiment of a high efficiency dust charging device of a l screw type.

FIG. 2 is a cross-sectional view showing a state in which AA ′ of FIG. 1 is cut to show an assembled form of an insulating portion and a discharge electrode.

FIG. 3 is a cross-sectional view showing a state in which BB ′ of FIG. 1 is cut to show an assembled form of an insulating portion and a discharge electrode.

FIG. 4 is a front view and a side view of a flow guide cone.

FIG. 5 is an exploded view of one part of the cross-shaped insulating support.

FIG. 6 is a front view and a side view of a discharge electrode.

[Explanation of symbols]

1… flow guide cone 2… insulated supporting bar 3… helical screw type corona discharge electrode (helica)
l screw type discharge electrode) 4 ... pipe type ground electrode 5 ... supplementary wire discharge
electrode 6 ... high voltage lead wire 7 ... center rod

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kim Sang-do 997 Boraa Part 203-1002, West District Mikawa-dong, Daejeon, Republic of Korea Part 203-1002 (72) Inventor Choi Kyung-ho Songjiang-dong, Songjeong-dong, Yuseong, Daejeon, Republic of Korea 307-708 ( 72) Inventor 赊 赫 眞 313, Yangseong-dong, Seongdong-dong, Seoul, South Korea 907-701 (72) Inventor, Park Yongfu, Gyeonggi-do, Gyeonggi-do, Gyeonggi-do, New City, 5-7 Ginga-ri, 511- 1001 (72) Inventor Lin Soo Shu, Incheon, South Korea Incheon, South Korea, Seoul, Seoul 104-1501 (72) Inventor Yin Honan, 1-8, Lot, Southeast Apartment, 8-8, Jihuang, West Incheon, Republic of Korea −1002 (72) Inventor Shang Hyun, Gyeonggi-do, Gyeonggi-do, Korea 1353-2001 Yamamoto-dong Gyusei Apart (56) Reference JP-A-11-249382 (JP, A) JP-A-56-95351 JP, A) JP Akira 52-13175 (JP, A) JP Akira 49-104271 (JP, A) JP Akira 49-103267 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) B03C 3/00-3/88

Claims (4)

(57) [Claims] 1. A dust that is discharged from a process in which dust is generated.
In a dust charging device for charging particles, dustparticleDust discharging device and filter cloth dust collecting device
Installed betweenHigh efficiency of helical screw type
Rate dust charging device, The charging device is A cylindrical ground electrode that functions as a duct, It is installed inside the above-mentioned cylindrical grounding electrode to load dust particles.
Electric helical screwHave wingsCorona discharge
Poles, Helical screw characterized by being composed of
Of typeHigh efficiencyDust charging device. 2. A corona discharge electrode having the helical screw blades is supported by center rods penetrating cruciform heat-resistant insulating supports installed at both inner ends of the cylindrical ground electrode. The helical screw type high-efficiency dust charging device according to claim 1. 3. The center rod supporting the corona discharge electrode having the helical screw blades is located on the dust discharging device side.
The helical screw type high-efficiency dust charging device according to claim 2, wherein a flow guide cone for guiding the flow of dust particles is installed at the end of the above, and a high voltage lead-in wire is connected to the opposite end. . 4. The high efficiency of the helical screw type according to claim 1, wherein a plurality of auxiliary wire type discharge electrodes are installed around the corona discharge electrode having the helical screw blades. Dust charging device.