JP2008104937A - Electric dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric dust collector which enables a maintenance of a high decontamination efficiency even if a charged electric power is decreased, and has a long life. <P>SOLUTION: A discharge atmosphere is produced between a discharge plate 1 and a grounding plate 2 opposed and provided mutually in parallel, and a charging part (EP) charging particles passing through here is provided. The discharge plate 1 is a long plate body, and at both the side edges 12, 13 a plurality of discharge projections 11 are formed longitudinally at intervals. The formation position is out of alignment mutually in the longitudinal direction at one side edge and at the other side edge. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrostatic precipitator, and more particularly, to an electrostatic precipitator that is intended to extend the life and reduce the operating cost by improving the electrode plate shape in a charging unit for charging dust particles toward a collecting unit.

  An electrostatic precipitator generally includes a charging unit and a dust collecting unit, and flows contaminated air into a discharge atmosphere formed in the charging unit to charge dust particles and the like contained in the contaminated air. It is sucked and collected with the air and is discharged as clean air.

  Conventionally, the charging unit is provided with a discharge wire to which a negative DC voltage is applied so as to face a grounded electrode plate, and a corona discharge is generated between the discharge wire and the ground electrode plate. The polluted air was passed through to charge the dust particles. By the way, although the discharge wire has an advantage that high dust removal efficiency can be obtained with relatively low input power, there is a problem that the life is short due to disconnection or the like.

Therefore, in Patent Document 1, for example, a discharge electrode plate is provided in parallel to the ground electrode plate instead of the discharge line, and a plurality of triangular protrusions having different protrusion lengths are alternately formed on the side edge of the discharge electrode plate, thereby removing dust. There has been proposed an electrostatic precipitator that extends the lifetime without reducing the efficiency.
JP 2004-255244 A

  However, the conventional electrostatic precipitator described in the above publication has a problem that the input power becomes large and the operation cost increases when it is attempted to maintain high dust removal efficiency.

  Therefore, the present invention solves such a problem, and an object of the present invention is to provide an electrostatic precipitator that can maintain high dust removal efficiency even when input power is lowered and that further extends the life.

   In order to achieve the above object, according to the first aspect of the present invention, a charging unit that generates a discharge atmosphere between a pair of opposed electrode plates (1, 2) provided in parallel to each other and charges particles passing therethrough In the electrostatic precipitator provided with (EP), a plurality of rectangular discharge protrusions (11) are formed on one (1) of the electrode plates at intervals in the longitudinal direction on at least one side edge (12, 13). It consists of a long plate.

  In the first invention, the discharge between the other electrode plate occurs at the pair of right-angled corner portions of the rectangular discharge protrusions on the one electrode plate, so that a uniform and dense discharge atmosphere is generated and contamination occurs. Air dust particles and the like are reliably charged and sucked and collected by the dust collecting section at the subsequent stage. As a result, the dust removal efficiency is maintained high, and the discharge current can be reduced, so that the input power to the electric dust collector can be reduced. In addition, since the rectangular discharge protrusion has two discharge portions, the discharge amount per discharge portion is reduced and consumption is reduced as compared with the conventional triangular protrusion, so that the life can be extended.

  In the second aspect of the invention, the discharge protrusions (11) are formed on both side edges (12, 13) of the long plate body, and the positions of the discharge protrusions (11, 13) are shifted from each other in the longitudinal direction between one side edge and the other side edge.

  In the second aspect of the invention, a uniform and dense corona discharge atmosphere can be generated more effectively, so that further improvement of dust removal efficiency and reduction of input power are realized.

  In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  As described above, according to the electric dust collector of the present invention, the dust removal efficiency can be maintained high even if the input power is lowered, and the life can be extended.

  FIG. 1 shows a conceptual structure of the charging unit EP. In FIG. 1, the discharge part 1 is provided in the charging part EP so as to face the flat ground electrode plate 2 in parallel. The discharge electrode plate 1 is a long plate body, and a large number of discharge protrusions 11 are formed at regular intervals in the longitudinal direction on both side edges. As shown in FIG. 2, the discharge protrusion 11 is formed in a rectangular shape having a pair of right and left corner portions 111 at the tip. When a DC negative voltage is applied to such a discharge electrode plate 1, corona discharge occurs between each corner portion 111 and the ground electrode plate 2, and uniform and dense corona discharge between the ground electrode plate 2. An atmosphere is generated.

  As a result, the dust particles of the contaminated air are reliably charged and sucked and collected by the subsequent dust collecting section. In the present embodiment, as shown in FIG. 3, the discharge protrusion 11 on one side edge 12 (FIG. 1) of the discharge plate 1 of the long plate body is positioned with the discharge protrusion 11 on the other side edge 13. Since they are staggered, a uniform and dense corona discharge atmosphere can be generated more effectively. Compared to the conventional triangular protrusion, the rectangular discharge protrusion 11 has two discharge portions (corner portions 111) compared to the conventional triangular discharge protrusion with a sharp point. Since the amount of discharge per discharge portion is small and the wear is small, the life is extended.

  The type I discharge electrode plate in which the width W of the rectangular discharge protrusion 11 in FIG. 2 is 3 mm, the height H is 10 mm, and the interval D between these discharge protrusions 11 is 15 mm, and the width W and height H are the same as type I. The discharge electrode plate of type II with a discharge protrusion interval D of 20 mm, compared to a conventional discharge electrode plate with an interval of 10 mm and a triangular protrusion height of 10 mm and 5 mm alternately, FIGS. 4 and 5 show the relationship between the applied voltage and current, and the relationship between the applied voltage to the charging unit and the dust removal efficiency, respectively. In the figure, line x is a type I plate, line y is a type II plate, and line z is a conventional plate.

  As is clear from FIG. 4, the current flowing through the charging unit for each applied voltage is smaller in the type I plate and the type II plate than in the conventional plate, and therefore the input power to the electrostatic precipitator should be lowered. Can do. In this state, the dust removal efficiency with respect to each charging portion applied voltage is almost the same as that of the conventional electrode plate (line z) for both the type I electrode plate (line x) and the type II electrode plate (line y) at a processing wind speed of 13 m / s. No (FIG. 5 (1)). When the processing wind speed is 11 m / s, the dust removal efficiency of the type II electrode plate (line y) is slightly reduced (FIG. 5 (2)), and when it is 9 m / s, the dust removal efficiency of the type I electrode plate (line x) is slightly reduced. However (FIG. 5 (3)), the dust removal efficiency of 80% or more required for practical use has been achieved.

It is a perspective view which shows the conceptual structure of a charging part. It is a principal part enlarged front view of a discharge electrode plate. It is a partial front view of a discharge electrode plate. It is a graph which shows the relationship between the voltage applied to the charging unit and the current. It is a graph which shows the relationship between the voltage applied to a charging part, and dust removal efficiency.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Discharge electrode plate (electrode plate), 11 ... Discharge protrusion, 12, 13 ... Side edge, 2 ... Ground electrode plate (electrode plate), EP ... Charging part.

Claims (2)

In an electrostatic precipitator including a charging unit that generates a discharge atmosphere between a pair of electrode plates that are opposed to each other and are parallel to each other and charges particles that pass through the discharge atmosphere, one of the electrode plates is connected to at least one side edge. An electrostatic precipitator comprising a long plate body formed with a plurality of rectangular discharge protrusions spaced apart in the longitudinal direction. 2. The electrostatic precipitator according to claim 1, wherein the discharge protrusions are formed on both side edges of the long plate body, and the positions of the discharge protrusions are shifted from each other in the longitudinal direction between one side edge and the other side edge.

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