JP3004260B1 - Disc type high efficiency dust ionizer - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To improve dust collection efficiency for fine dust particles,
Disc type high efficiency dust ionizer composed of discharge electrode and ground electrode which can reduce the pressure loss of filter cloth, extend the life of filter cloth, and achieve maximum dust ionization efficiency with minimum power consumption I will provide a. SOLUTION: A disk-shaped discharge electrode is disposed inside a pipe so that it can be easily attached without adding an installation space to a dust inlet of an existing filter cloth dust collector.
By forming a uniform electric field by forming a constant distance from the ground electrode and increasing the current density even with low power consumption, the disk-shaped discharge electrode can be formed while minimizing the disturbance of play caused by the disk-shaped discharge electrode. A large number of dust particles are arranged in the floating direction so that dust particles are repeatedly ionized, thereby maximizing the ionization efficiency of dust.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for effectively collecting dust particles discharged from a dust generation process such as a heavy oil combustion process, a waste incinerator process, a steelmaking industry and a pulverized coal combustion process of a power plant. By applying electrostatic attraction to the dust particles flowing into the filter cloth dust collector, the collection efficiency of fine dust particles is increased by the filter cloth, and the formation of a dust layer having a large porosity on the filter cloth surface is induced to reduce pressure loss. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust ionization device and a design of a discharge electrode and a ground electrode of a dust ionization device capable of increasing ionization efficiency of fine dust even under conditions of low power consumption and high flow velocity, and a structure thereof.

[0002]

2. Description of the Related Art In a business where a large amount of dust is discharged, an electric dust collector and a filter cloth dust collector are widely used to collect and remove the discharged dust. Generally, in the process of treating a large volume of combustion gas such as a pulverized coal-fired power plant, an electric precipitator is mainly used, and an industrial body for treating medium / small volume combustion gas and dust-containing gas. In this case, a filter cloth dust collector is mainly used.

[0003] However, in the electric dust collector, as the use of fuel is gradually switched to low-sulfur fuel to satisfy the air pollution regulation value, the discharged dust has a large non-resistance, and the reverse ionization phenomenon occurs. As a result, it becomes impossible to maintain the conditions suitable for the electric dust collection, and the dust collection performance by the electric dust is rapidly reduced. Accordingly, a filter cloth dust collector, which is a dust collector capable of maintaining a stable and high dust collection efficiency without depending on the electrical characteristics of dust different from the electric dust collector, has been developed. And applied it to the Pennsylvania Power and Light Company's Sunbury Power Plant and the Houston Lighting and Paws Parish Power Plant and the Colorado Comanche Power Plant to replace the electric dust collector with a filter cloth dust collector.

[0004] Such a filter cloth dust collector had many problems at the beginning, but it has been confirmed that high dust collecting performance is maintained and high reliability. It was recognized that there was a possibility that it could be replaced. However, if the filtration operation proceeds, the dust layer collected on the filter cloth becomes thick and the pressure loss increases, so that normal operation becomes impossible.
Therefore, it is necessary to remove dust collected on the surface of the filter cloth by a periodic dust removal operation (cleaning).

[0005] The dust removal operation is mainly an operation of removing dust layers collected on the surface of the filter cloth by applying physical motion or strong energy. At this time, if the inlet dust concentration is high or the filtration speed is high, or under the operating conditions where the dust layer is not so dusty, increase the frequency of dusting operation to maintain the operation of most devices or use high compression for dust removal. A large amount of air is injected to perform the dust removal operation.

[0006] However, application of such dust removal conditions causes the pores of the filter cloth to become large and dust particles to pass through the pores, which is a factor of reducing the dust collection efficiency. In addition, the filter cloth and filter cloth support frame are removed from frequent dust removal operations.
The filter cloth is worn and damaged by contact collision with the bag cloth, thereby shortening the life of the filter cloth. Designing the filtration speed at a high speed has the advantage of reducing the size of the apparatus, but the pressure loss sharply increases, so that application of a low filtration speed is inevitable.

[0007] In order to fundamentally solve the problems of the filter cloth dust collector and maintain high efficiency, electrostatic force is applied to the inflowing dust particles to increase the collection efficiency of the fine dust particles. In addition, it is necessary to develop a technology for maintaining the porosity of the dust layer formed on the surface of the filter cloth as large as possible and reducing the pressure loss. When electrostatic force is applied to the dust flowing into the filter cloth dust collector, a dust layer is formed in a porous tree-like structure on the surface of the filter cloth due to electric force between the dust particles.

[0008] The dust layer thus formed has a high porosity, so that the pressure loss is reduced and the penetration of dust particles into the filter cloth is reduced. In addition, there is an effect that the collection efficiency for the fine dust particles is increased by adding an electric attractive force in addition to the interception or the inertial collision by the collection of the dust particles. Utilizing the effect of improving the performance of the filter cloth dust collector by such dust ionization, as a dust ionizer of a filter cloth type dust collector in which a dust collector and a dust ionizer that have been developed to date are combined, an electrode is used. Depending on the form and location of G. FIG. Precipitator tube type dust ionizer (APITRON) developed by Felix, etc.
1982 D.C. W. A filter cloth support frame dust ionizer (ESFF) developed by Vanosdell et al. P. Don
Ovan et al., a dust ionizer installed in an inflow duct, a woven discharge electrode type dust ionizer developed by Vanosdell et al., 1984; S. Diner ionizer with internal discharge electrode (A-ESFF) developed by Viner et al., 19
1991 D. J. There was a screen type dust ionization device for installation inside a hopper developed by Helfritch et al.

[0009]

However, the conventional precipitator tube type dust ionization device (APITRON) is a device which is in the stage of commercialization in a form in which a filter cloth and a dust ionization device are connected in series. However, the structure of the apparatus was complicated, and maintenance and maintenance such as replacement of the filter cloth and repair in case of failure were difficult. In addition, there is a problem that dust particles are re-adhered to the inside of the precipitator tube during dust removal.

[0010] Frame-type dust ionizer (ESFF) supporting filter cloth
The electrode is located inside the filter cloth in combination with the structure of the filter cloth support frame, and the insulating structure connecting the structure of the filter cloth support frame and the electrode has the combustion gas condition and the impact at the time of dust removal. In addition, there is a drawback that a stronger electric field cannot be formed to prevent the filter cloth from being damaged.

In addition, the dust ionization device provided with an inflow duct is of a type in which a discharge electrode in the form of a wire is inserted into a dust-containing gas inlet of a filter cloth dust collection device. It has the advantages that the equipment can be used, the structure is simple, the installation cost is low, and maintenance and maintenance are convenient.
Since the distance from the dust ionizer to the filter cloth is long, there is a disadvantage that the dust ionization rate decreases near the filter cloth.

The woven discharge electrode type dust ionizer is a form in which a stainless steel electrode is contained in a filter medium and woven like a fiber, and is about three times as expensive as existing filter cloths. Alternatively, filtration performance, such as the effect of dust ionization being reduced when acid coagulation occurs, is sensitive to the type of dust. In addition, there is a disadvantage that the applied electric field cannot be increased because the fiber may be damaged.

Dust ionizer with internal discharge electrode (A-ESFF)
Is a method of installing a discharge electrode in the form of a stainless wire at the center of a filter cloth. The structure of the device is easy and no additional installation area is required, but frequent breakage due to high voltage application and difficulty in maintenance and maintenance And the like. The screen type dust ionizer for installation inside the hopper is a type in which a screen type discharge electrode composed of a series of pointed ends facing the wire screen ground electrode is inserted inside the hopper of the filter cloth dust collector. Since it is installed between the filter cloth and the hopper, there is a problem in that when the dust passes through the dust ionizer during dust removal, the dust is stacked and the discharge efficiency is reduced.

[0014] The conventional electric filter cloth dust collector has the effect of increasing the dust collection efficiency of fine dust and reducing the pressure loss in the filter cloth. However, the structure of the dust ionizer is complicated and the existing filter is not used. There is a drawback that a large amount of installation cost is required because the cloth dust collection facility needs to be replaced with a new facility. Therefore, the present invention has been devised to solve such a problem, and an object of the present invention is to provide an electric precipitator, which is a new precipitator that combines the principles of existing electric precipitator and filter cloth precipitator technology. Filter cloth dust collector can increase dust collection efficiency for fine dust particles, reduce filter cloth pressure loss, prolong filter cloth life, achieve maximum dust ionization efficiency with minimum power consumption An object of the present invention is to provide a high-efficiency dust ionization device including a discharge electrode and a ground electrode.

[0015]

According to a feature of the present invention, a dust ionizer according to the present invention improves the dust collecting performance of a filter cloth dust collector with low energy consumption and increases the installation area. It consists of a structure and design technology that can be minimized. In addition, the structure, arrangement and assembly technology of a disk-shaped discharge electrode for forming a uniform electric field inside the dust ionization device,
The cylindrical grounding pole shape that plays the role of the grounding pole together with the outer wall structure of the dust ionization device, the discharge electrode and grounding funding to achieve high ionization efficiency by forming a high-density electric field with low power consumption, It is composed of a discharge electrode inlet shape for minimizing the disturbance of movement, a support base structure for supporting the discharge electrode and insulating the ground electrode from the ground.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration and operation of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an assembly view schematically showing the structure of a disk-shaped high-efficiency dust ionizer according to the present invention, and FIG. 2 is a cross-sectional view showing an assembling mode of an insulating portion and a discharge electrode of the disk-shaped high efficiency dust ionizer. FIG. 3 is a component diagram of a discharge electrode and an insulating portion of the disc-shaped high-efficiency dust ionizer.

As shown in FIG. 1, the disk-type high-efficiency dust ionizer according to the present invention has a pipe-shaped high-efficiency dust ionizer which can be easily attached to the existing filter cloth dust collector without adding an installation space to the dust inlet. A disk-shaped corona discharge electrode is arranged inside, and the disk-shaped corona discharge electrode forms a uniform electric field by forming a constant interval with the cylindrical ground electrode, so that the current density can be increased even with low power consumption. In this way, a large number of disc-shaped corona discharge electrodes are arranged in the direction of movement while minimizing the disturbance of movement caused by the disc-shaped discharge electrodes, so that dust particles are repeatedly ionized, thereby improving the ionization efficiency of dust. Is configured to be maximized.

Here, the length of the dust ionization apparatus is 1000 mm, and the length of the dust ionization apparatus is such that the pressure loss is reduced by inserting a disk-shaped corona discharge electrode to prevent the accumulation of dust and achieve the maximum dust ionization efficiency. The diameter of the corona discharge electrode is 50mm,
The distance between the disk-shaped corona discharge electrodes is 15 mm, and the distance between the cylindrical ground electrode and the disk-shaped corona discharge electrode is 25 mm. As shown, the disc-shaped high-efficiency dust ionizer has a disc-shaped corona discharge electrode in which a number of discs made of stainless steel are combined and a cylindrical ground electrode in the form of a pipe, and a disc-shaped corona discharge electrode. It consists of an insulating support for supporting and insulating from the cylindrical grounding pole, and a floating guiding cone located at the entrance of the dust ionizer to reduce the disturbance of the floating.

The existing pipe-type dust ionization apparatus has a form in which a discharge electrode formed as a single wire is inserted inside the pipe, and the current intensity in the electric field is weak and the power consumption is large. In addition, it is necessary to apply a constant tension in order to maintain a constant distance between the discharge electrode and the ground electrode, and the discharge electrode is frequently damaged due to this. However, as shown in FIG. 2, the disc-shaped high-efficiency dust ionizer of the present invention is the same as that of FIG.
As shown in the cross-sectional view taken along the line A ', a disk made of SUS is attached to a center rod supported by six insulators made of Teflon (see Fig. 3) in the pipe along the line BB' in Fig. 1. As shown in a cross-sectional view taken along the line, a large number of parts are mounted along the center of the pipe.

The distance between the SUS disks mounted on the center rod is adjusted and fixed by the discharge electrode distance adjusting pipe ring shown in FIG. When a disk-shaped corona discharge electrode of a disk shape is inserted at the center of the cylindrical ground electrode, the interval between the discharge electrode and the ground electrode is formed to be constant, so that the space between the discharge electrode and the ground electrode is formed. An electric field with a constant current density can be formed. In addition, when the diameter of the discharge electrode is enlarged and the distance between the discharge electrode and the ground electrode is reduced within a range where the pressure loss is not so large, the corona disclosure voltage is reduced, so that even when the power consumption is low, a large current density is obtained. Is obtained, and it is possible to prevent the current state in which the ionized dust due to the increased flow velocity is attached to the surface of the ground electrode by the electric attraction.

By arranging a large number of disk-shaped corona discharge electrodes in the flow direction of the fluid, dust introduced into the apparatus is repeatedly ionized while passing through an electric field several tens of times. Even under high-speed and high-speed conditions, the ionization efficiency of fine dust particles increases.

[0022]

As described above, the disk-shaped high-efficiency dust ionization apparatus according to the present invention has a simple structure and can use the existing filter cloth dust collection facility as it is, so that an additional installation cost is unnecessary and an installation space is unnecessary. As a result, the dust ionization efficiency is high even at low power consumption, so that it is economical and the life of the filter cloth can be extended.

Further, the apparatus according to the present invention is the first technique in the technical development of a high-efficiency dust ionization apparatus in the aspect of structure since the ionization efficiency of fine dust particles can be increased with low power and the system configuration technology of the apparatus.

[Brief description of the drawings]

FIG. 1 is an assembly view schematically showing a structure of a disk-shaped high-efficiency dust ionization apparatus.

FIG. 2 is a cross-sectional view showing an assembling mode of an insulating part and a discharge electrode of the disc-shaped high-efficiency dust ionization apparatus.

FIG. 3 is a diagram showing components constituting a discharge electrode and an insulating portion of the disk-shaped high-efficiency dust ionization device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Idle guide cone 2, 25, 31 Disc-shaped corona discharge electrode 3, 23 Cylindrical grounding electrode 4 Insulation support base 5, 24, 32 Pipe ring for adjusting discharge electrode spacing 6 High-voltage lead-in line 21 Insulation support base 22 Center rod 33 Insulator

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ku Cheol-Oh Korea, Daejeon-shi, Theok, Dunsan-dong, 1-106, Eunchoron Apartment 908-3 (72) Inventor Lim Jeon-Hwan Republic of Korea, Daejeon-si, Dong-ku, Daesong-dong, 107-107, Samic apartment 30 (72) Inventor Kim Sang-do Republic of Korea, Daejeon-si, Theok, Samcheong-dong, 203-1002, Bo La Appart (72) Inventor Choi Ho-Kyun South Korea, Seoul, Kang-dong, Jill-dong, 109-1 (72) Inventor Kim Hong-Yong South Korea, Daejeon-shi, Theok, Doma 1-dong, 1-505, Bokehung Apartment (72) Kwon Pi, the inventor Lu-Heon Republic of Korea, Kunguido, Kumposi, Sambong-dong, Yusun apartment 1315-2001 (56) References JP-A-63-274428 (JP, A) JP-A-1-242158 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B03C 3/00-3/88 B01D 51/00

Claims (2)

(57) [Claims] In the construction of a disk-type high-efficiency dust ionizer, a disk-type discharger is installed inside a pipe so that it can be easily attached without adding an installation space to a dust inlet of an existing filter cloth dust collector. An electrode is disposed, and the disc-shaped discharge electrode is formed at a constant distance from a ground electrode to form a uniform electric field, so that current density can be increased even with low power consumption, and the disc-shaped discharge electrode is formed. While minimizing the disturbance of movement caused by the electrode, the disc-shaped discharge electrode is connected to the shaft of the pipe.
A high-efficiency disk ionization apparatus characterized in that dust particles are repeatedly ionized by arranging a large number of particles in a linear direction so that the ionization efficiency of dust can be maximized. 2. The length of the dust ionization device is set to 1 to reduce the pressure loss by inserting the disk-shaped discharge electrode to prevent the accumulation of dust and to achieve the maximum dust ionization efficiency.
000mm, diameter of discharge electrode is 50mm, distance between discharge electrodes is 1
2. The high-efficiency disk ionizer according to claim 1, wherein the distance between the ground electrode and the discharge electrode is 5 mm.