JP3634178B2 - Electric dust collector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric dust collector capable of removing (collecting) dust particles such as fine dust and mist from an air stream by a dust collecting element to which a high voltage is applied. The present invention relates to an electrostatic precipitator having a function of preventing dusts from adhering to insulating means such as an insulator for holding a high-voltage electrode.
[0002]
[Prior art]
When air currents containing dust flow into the insulator that supports the high-voltage electrodes of the electrostatic precipitator, dust or moisture adheres to the insulator, resulting in reduced insulation and creeping discharge, or short-circuiting high-voltage current. In the past, various measures have been taken to prevent dust from adhering to the insulator.
[0003]
For example, Japanese Patent Laid-Open No. 5-2003325 discloses that a cover is provided so that dust does not flow into an insulator, and Japanese Patent Laid-Open No. 6-335638 and Japanese Patent Laid-Open No. 9-119658 include It describes that the insulators are dried to form a structure in which dust does not easily adhere.
[0004]
[Problems to be solved by the invention]
However, the solution provided with the cover described in the first publication described above can prevent the dust from flowing into the insulator supporting each electrode as much as possible. For reasons such as protection from the cocoon, the insulator portion cannot be completely removed from the airflow, so that the insulator contamination cannot be reliably prevented.
[0005]
In addition, as described in the second and third publications above, in order to maintain the insulator in a dry state, it is necessary to dry the insulator using a heater or a warm air device, which leads to an increase in running cost and equipment cost. was there.
[0006]
Therefore, the technical problem of the present invention is to provide an electrostatic precipitator equipped with a dust adhesion preventing function that can reliably prevent adhesion of fine dust, mist, etc. to the insulator using an inexpensive and simple device. It is to be.
[0007]
[Means for Solving the Problems]
Means taken in the present invention to solve the above technical problems are as follows.
[0008]
(1) A two-stage electric system configured such that particles such as fine dust and mist contained in the air current are charged by a high-voltage charging unit, and then these charged particles are collected by the dust collecting unit. A dust collector, wherein one or both of the high-voltage charging unit and the dust collecting unit are spaced apart from a plurality of load electrodes supported by a power supply member and a plurality of ground electrodes supported by a grounding member. The power supply member and the grounding member are held together by an insulating means such as an insulator, and the insulating means is provided at a position away from the main airflow. The flow path space of the airflow that flows out toward the insulating means away from the structure is configured, and by applying a voltage to the power supply member, the fine dust or mist contained in the airflow is contained in the airflow space. When configured to generate an electric field that causes the grounding member to collect particles, In addition, a power source for generating an electric field in the flow path space and a power source for charging the load electrode are configured by the same power source. (Claim 1)
[0009]
(2) The entire grounding member that supports the ground electrode is formed in a frame shape having seat plates on both sides, and the outer end portion of the power feeding member that supports the load electrode is led out to the outside of the seat plate. The power supply plate is attached to a high voltage electrode plate connected to the power supply plate, and the power supply plate is attached to the seat plate via an insulator to keep it in an insulated state, and is connected to a part of the power supply plate or the power supply plate. By providing a high-voltage electrode plate close to the seat plate, a flow path space for the air flow from the main airflow to the outside of the seat plate and toward the insulator is formed, and voltage is applied to the power supply plate. Therefore, it is configured to generate an electric field for collecting particles such as fine dust and mist contained in the airflow in the airflow path to the seat plate . (Claim 2)
[0010]
(3) By extending an electrode wire connected to the other pole of the high-voltage power supply inside the dust-collection chamber connected to one pole of the high-voltage power supply, it is included in the airflow in the internal space of the dust-collection chamber. A single-stage electrostatic precipitator configured to charge and collect fine dust, mist, etc., with both ends of the electrode wire being connected to the inner wall surface of the dust collecting chamber by insulating means such as insulators. Each of these insulating means is supported and electrically conductive to prevent adhesion of fine dust and mist contained in the airflow flowing through the dust collection chamber to the insulating means by covering each insulating means. The inside of the dust collecting chamber is installed by attaching the protective umbrella body made of the body, connecting each of these protective umbrella bodies to the above electrode wires , and providing the tip edge of each protective umbrella body close to the inner wall surface of the dust collecting chamber. A flow path space for the air flow from the space toward the insulating means is configured to By applying a voltage to the chamber and the electrode line, that fine dust and mist contained in the gas flow to the flow channel space be configured to generate an electric field to be collected in the dust collecting chamber. (Claim 3)
[0011]
According to the means according to claim 1 described in the above (1), the insulating means such as the insulator is provided at a position deviating from the main airflow, and the airflow containing fine dust or mist is the main airflow. Since an electric field is generated in the flow path space from the (flow path) to the insulating means, fine dust, mist, etc. in the airflow flowing toward the insulating means are collected on the ground side and insulated. Since it does not reach the means, it is possible to keep the insulator or the like in a clean state and maintain its insulating function in a good state forever.
[0012]
Further, according to the means according to claim 1 described in the above (1), the power source for generating the electric field in the flow path space and the power source for charging the load electrode are the same , and are separately used for generating the electric field. Therefore, it is possible to reliably prevent adhesion of fine dust, mist, etc. at a relatively low cost.
[0013]
According to the means according to claim 2 described in the above (2) , the air flow containing fine dust, mist, etc. that has flowed out of the seat plate out of the main air flow flowing in the ground member made in the frame shape is Before reaching the insulator, fine dust and mist are collected on the seat plate side (earth electrode) by the electric field generated in the flow path space, that is, the narrow gap between the high voltage electrode plate and the seat plate, Since it is naturally dropped and collected, it is possible to reliably prevent fine dust or mist from adhering to the insulator.
[0014]
According to the means according to claim 3 described in the above (3), even in a one-stage electric dust collector that simultaneously charges and collects dust in the dust collecting chamber, the protective umbrella, and the protective umbrella, By the electric field generated between the dust collection chambers, it is possible to prevent adhesion of fine dust, mist, and the like to insulating means such as insulators.
[0015]
As described above, the technical problems described above can be solved by the means (1) to ( 3 ) and the problems of the conventional techniques can be solved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an electrostatic precipitator according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the whole of a two-stage electrostatic precipitator, in which A is an electrostatic precipitator. The airframe of the device, B and C are high voltage charging parts and dust collection parts that are freely retractable in the interior AH, AS is the inlet of the dust-containing air flow indicated by X, AT is clean air indicated by X ' Showing the exit.
[0017]
2 is an enlarged side view of the high voltage charging portion B, FIG. 3 is a front view thereof, and FIGS. 4 and 5 are an enlarged plan view and a perspective view of the main portion. In the drawings, 1A and 1B are front and rear grounded frame frames which are assembled to each other with a space in the airflow direction, and 1C and 1C are left and right seats provided so as to close the space between both sides. The plates 6... Are attached to the upper and lower portions of the front frame 1 </ b> A by attaching mounting plates 6 </ b> A and 6 </ b> B (FIG. 3 to FIG. 5) provided on the upper and lower sides, respectively, so that there is a space inside the housing of the frame frames 1 </ b> A and 1 </ b> B. A plurality of ground electrode plates (dust collecting plates) arranged side by side are shown.
[0018]
Further, 5 is a load electrode plate formed by caulking and attaching a large number of needles 5P to a plurality of crimping portions 5H provided in the vertical direction, and the load electrode plate 5 has upper and lower ends 5A, 5B ( 2 is supported by the upper and lower support members 4T and 4S, and one is interposed in each interval between the ground electrode plates 6. 5, 5S... Are springs for suspending the load electrode plates 5... 4Ta are suspension holes for the springs 5S provided on the upper support member 4T.
[0019]
Further, in the figure, 2 is a power feeding plate attached to the outer ends of the upper and lower load electrode support members 4T, 4S protruding outside the left and right seat plates 1C, 1C, and 2K is a power feeding attached to the power feeding mounting plate 2X. This power supply plate 2 is insulated on the support plate 1B ′ (FIGS. 4 and 5) provided on the outside of the left and right seat plates 1C and 1C using a total of four insulators 3. Is held fixed.
[0020]
In FIGS. 4 and 5, 2A and 2B are high voltage electrode plates connected to the upper and lower sides of the power supply plate 2, and the outer ends of the load electrode support members 4T and 4S are the upper and lower high voltage electrodes. plate 2A, mounted on 2B, also the high voltage electrode plate 2A of this like, 2B, as can generate an electric field between the seat plate 1 C, close to the outer surface of該席plate 1C Provided in the state, and deviated from the main airflow flowing in the direction of the sign X → X ′ in the frame frames 1A and 1B, and the distribution space indicated by the reference numeral 5R in FIGS. Particles such as fine dust and mist contained in the airflow flowing toward the gap between the plate 1C and the high-voltage plates 2A and 2B are grounded before reaching the insulators 3 ... It is structured to collect on the grounded seat board 1C side.
[0021]
Next, FIG. 6 is a plan view of the above-described dust collecting portion C, FIG. 7 is a perspective view seen from the front side thereof, and FIG. 8 is a cross-sectional view showing an enlarged Z-view portion of FIG. In these drawings, 10 is a grounded frame frame, 10 ', 10' are seat plates attached to the left and right sides of the frame frame 10, 14 ... are these frame frame 10 and left and right seat plates 10 ', 10'. A grounding electrode plate (dust collecting plate) arranged in parallel with a large interval inside a dust collecting housing constituted by a ′, indicated by reference numeral 16 in FIG. 8 is each of these grounded dust collecting plates 14. Spacer shafts 16B... Are spaced and collars 16A are tightening screws for attaching the spacer shaft 16 to the seat plate 10 '. In reality, four spacer shafts 16 are installed in the housing. And a mechanism for grounding and maintaining the distance between the ground electrode plates 14. Yes.
[0022]
Further, in the figure, 15 is a load electrode plate interposed between the ground electrode plates 14. Reference numeral 17 in FIG. 8 is a spacer shaft for mounting the load electrode plates 15 at intervals. 17B is a collar for holding the gap, and 17A is a power feeding plate in which the tip ends of the spacer shafts 17 projecting outward from the holes 10H drilled in the seat plate 10 'are provided outside the seat plate 10'. 11 is a tightening screw that is attached to the high voltage electrode plate 11B that is connected to the upper and lower sides, 11 is a spring for feeding power, 14A is an insertion hole for a spacer shaft 17 provided in each ground electrode plate 14, and this spacer shaft Actually, a total of four are installed in the housing, and a total of four power supply plates 11 are provided outside the left and right seat plates 10 ', 10'. It is structured to supply power to ... and maintain the interval.
[0023]
In addition, 12 ... is an insulator attached between the attachment plate 11A provided on each of the power supply plates 11 ... and the attachment frame 10A provided on each seat plate 10 ', and 12A, 12A are the attachment screws, These insulators 12... Hold the power supply plates 11 in an insulated state with respect to the grounded seat plate 10 ′, and the high voltage electrode plates 11 B of the power supply plates 11. The spacer shaft 17 is inserted into the main plate 10 so as to be separated from the main airflow flowing in the direction of the symbol XX ′, so that an electric field can be generated between the main plate 10 ′ and the outer surface of the seat plate 10 ′. The fine dust, mist, and the like contained in the airflow flowing into the circulation space indicated by reference numeral 11R from the hole 10H are grounded before reaching the insulators 12 ..., that is, the grounded seat plate 10 '. It is configured to collect on the side.
[0024]
Since the two-stage electrostatic precipitator shown in FIGS. 1 to 8 is configured as described above, the main airflow of dust-containing air flowing in the direction of reference XX ' The fine dust, mist, etc. contained in the airflow are charged by passing, and then the charged fine dust, mist, etc. are adsorbed and collected on the ground dust collecting plate 14 of the dust collecting part C. In the present invention, in particular, in the airflow that flows out in the direction of the flow spaces 5R and 11R of the high-voltage charging unit B and the dust collection unit C out of the main airflow flowing in the direction of XX ′. Dust, mist, etc. contained in the earth are collected on the ground pole, that is, on the grounded seat plates 1C and 10 'before reaching the insulators 3 ... and 12 ..., It is possible to prevent adhesion of fine dust and the like to each insulator 3.
[0025]
Next, an embodiment of a one-stage electrostatic precipitator according to the present invention will be described based on the descriptions in FIGS.
[0026]
FIG. 9 is a block diagram illustrating the entire apparatus, and FIG. 10 is a block diagram illustrating an enlarged main part of the present invention, in which 20 is provided with a dust-containing air supply port and a clean air discharge port. The dust collection chamber 21 is a DC high-voltage power supply, and its positive side is connected to the dust collection chamber 20.
[0027]
22 and 23 are insulators attached to the upper and lower sides of the dust collecting chamber 20, 22A and 23A are mounting bases for these insulators 22 and 23, and 24 is a wire electrode stretched between the upper and lower insulators 22 and 23. The negative side of the DC high-voltage power supply is connected to this wire electrode 24, and the particles such as fine dust and mist contained in the airflow sent from the supply port 20A are charged negatively, and this is charged positively. The dust collecting chamber 20 is attached to the surrounding dust collecting chamber 20 to collect dust.
[0028]
Numerals 25 and 26 are protective umbrellas attached to the upper and lower insulators 22 and 23, respectively. These upper and lower protective umbrellas 25 and 26, which are made of a conductor, have particles such as fine dust and mist directly. Are provided close to the inner wall surface of the dust collecting chamber 20 so that an electric field is generated, and the tip portions of the protective umbrella bodies 25 and 26 indicated by reference numerals 25R and 26R are provided. spacing between the inner wall surface of the dust collecting chamber 20, i.e., the fine dust and mist contained in the air flow coming flows through the flow path space, which is positively charged before reaching the insulator 22 It is configured to adsorb and collect on the inner wall surface of the dust collection chamber 20 to prevent the insulators 22 and 23 from being contaminated.
[0029]
【The invention's effect】
As described above, according to the electrostatic precipitator according to the present invention, fine dust, mist, etc. contained in the airflow that flows out of the main airflow passage and flows into the outer circulation space reach the insulator. Can be adsorbed and separated and collected on the side of the seat plate grounded by the electric field generated in this circulation space, or on the dust collection chamber side, so that dust, mist, etc. adhere to the insulator. This can prevent the occurrence of various problems such as deterioration of insulation, creeping discharge, and short circuit of high-voltage current, combined with the fact that the configuration is simple and easy to implement. Thus, it is suitable for a soot for use in each of the two-stage and one-stage electric dust collectors as shown.
[Brief description of the drawings]
FIG. 1 is a side view illustrating an entire two-stage electrostatic precipitator according to the present invention.
FIG. 2 is a side view of a high voltage charging unit.
FIG. 3 is a front view of a high voltage charging unit.
FIG. 4 is an enlarged plan view showing a main part of a high voltage charging unit.
FIG. 5 is a perspective view of a high voltage charging unit as seen from the front side.
FIG. 6 is a plan view of a dust collecting unit.
FIG. 7 is a perspective view of the dust collecting portion as viewed from the front side.
FIG. 8 is an enlarged plan cross-sectional view showing the main part of the dust collecting part.
FIG. 9 is a configuration diagram illustrating an entire single-stage electrostatic precipitator according to the present invention.
FIG. 10 is a configuration diagram illustrating a main part of a protective umbrella.
[Explanation of symbols]
A Two-stage electric dust collector body B High-voltage charging part C Dust-collecting part 1A, 1B Frame frame 1C Seat plate 2 Power supply plate 2A, 2B High-voltage electrode plate 3 Insulator 4T, 4S Support member 5 Load electrode plate 5R Space 6 Ground electrode plate 10 Frame frame 10 'Seat plate 11 Power supply plate 11B High voltage electrode plate 11R Distribution space 12 Insulator 14 Ground electrode plate 15 Load electrode plate 20 Dust collection chamber 21 of single-stage electrostatic precipitator Power supply 22, 23 Insulator 24 Wire electrodes 25, 26 Protective umbrella bodies 25R, 26R Distribution space

Claims (3)

A two-stage electrostatic precipitator configured to charge particles such as fine dust and mist contained in the airflow with a high-voltage charging unit, and then collect these charged particles with a dust collector. Because
One or both of the high-voltage charging part and the dust collecting part are alternately arranged in parallel with a plurality of load electrodes supported by the power supply member and a plurality of ground electrodes supported by the grounding member at intervals. The power supply member and the grounding member are held together by an insulating means such as an insulator, and the insulating means is provided at a position away from the main airflow. The flow path space of the airflow flowing inward is configured, and by applying a voltage to the power supply member, particles such as fine dust and mist contained in the airflow are captured by the grounding member with respect to the flow path space. An electric dust collector characterized in that an electric field to be collected is generated, and a power source for generating an electric field in the flow path space and a power source for charging the load electrode are configured by the same power source. apparatus. The entire grounding member that supports the ground electrode is made into a frame with seat plates on both sides, the outer end of the power supply member that supports the load electrode is led out of the seat plate, and the outer end is fed. A high voltage electrode attached to a high voltage electrode plate connected to the plate and attached to the seat plate via an insulator to keep it in an insulated state, and a part of the power supply plate or a high voltage electrode connected to the power supply plate. By providing the plate close to the seat plate, a flow path space for the air flow from the main airflow to the outside of the seat plate toward the insulator is formed, and the current is applied by applying a voltage to the power supply plate. 2. The electrostatic precipitator according to claim 1, wherein the electric dust collector is configured to generate an electric field that causes the seat plate to collect particles such as fine dust and mist contained in the airflow with respect to the road space. . By attaching an electrode wire connected to the other pole of the high-voltage power supply inside the dust-collection chamber connected to one pole of the high-voltage power supply, the fine air contained in the air current in the dust collection chamber's internal space A one-stage electrostatic precipitator configured to charge and collect dust, mist, etc.,
Both ends of the electrode wire are respectively supported by the inner wall surface of the dust collecting chamber through insulating means such as insulators, and these insulating means cover each insulating means in the airflow flowing through the dust collecting chamber. Attach a protective umbrella body made of a conductor that prevents adhesion of fine dust, mist, etc. contained in the insulating means, and connect each of these protective umbrella bodies to the above electrode wires , and the tip of each protective umbrella body By providing an edge close to the inner wall surface of the dust collection chamber, a flow path space for the air flow from the internal space of the dust collection chamber toward the insulating means is formed, and voltage is applied to the dust collection chamber and the electrode wire. An electric dust collector configured to generate an electric field for collecting fine dust, mist and the like contained in the airflow in the flow path space in the dust collection chamber .

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