Discharge wire for electrostatic precipitators

Abstract

To provide a discharge wire for electrostatic precipitators that can reduce maintenance costs in the event of elongation. [Solution] A discharge wire 42 is used in a suspended state as a discharge electrode 40 of an electrostatic precipitator 1, and the discharge wire 42 comprises a discharge wire body 42a, a locking part 42b provided on the upper end side of the discharge wire body 42a and locked to a suspension part 11 from which the discharge wire 42 is suspended, a weight 42c provided on the lower end side of the discharge wire body 42a, and a weight position adjustment part that adjusts the vertical position of the weight 42c when it is suspended from the suspension part 11.

Description

Technical Field

[0001] The present invention relates to a discharge wire for an electrostatic precipitator used as a discharge electrode of the electrostatic precipitator.

Background Art

[0002] Conventionally, for example, an electrostatic precipitator used for collecting fine particles such as dust from waste gas generated in, for example, sulfuric acid mist treatment in the mining industry, aluminum refining exhaust gas treatment, waste incineration process, etc. is known (for example, see Patent Document 1).

[0003] As an electrostatic precipitator, for example, there is one that is formed in a cylindrical shape with a circular or square cross-section, includes a dust collecting electrode extending in the vertical direction, and a discharge electrode including a linear discharge wire extending in the vertical direction on the inner peripheral side of the cylindrical dust collecting electrode.

[0004] The discharge wire is formed by coating a copper core wire with lead, the upper end side is supported and suspended, and tension is applied by the weight of a weight connected to the lower end side. Therefore, the weight of its own and the weight of the weight continue to act on the discharge wire, and elongation may occur over time. When the discharge wire elongates due to its own weight and the weight of the weight, the weight may contact the lower grid arranged on the lower side of the electrostatic precipitator, and slack may occur. When slack occurs in the discharge wire, the distance between the discharge wire and the dust collecting electrode may change, or the discharge wire may contact the dust collecting electrode, which may reduce the dust collecting performance of the electrostatic precipitator.

[0005] Therefore, as a method for suppressing the reduction of the dust collecting performance of the electrostatic precipitator, there are methods such as performing repair by cutting and rewelding the elongated part of the elongated discharge wire, or replacing it with a new discharge wire. Further, as another method for suppressing the reduction of the dust collecting performance of the electrostatic precipitator, a method of suppressing the occurrence of elongation of the discharge wire by using a discharge wire in which a stainless steel core wire, which is a metal that is difficult to deform, is coated with lead is considered.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2007-196159 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, methods involving repairing stretched discharge wires or replacing them with new ones may result in high maintenance costs, including the cost of repairing the discharge wires and the cost of replacing them. Furthermore, discharge wires using stainless steel core wires may have high manufacturing costs because the core wires themselves are expensive and difficult to process.

[0008] The object of the present invention is to provide a discharge wire for an electrostatic precipitator that can reduce maintenance costs in the event of elongation. [Means for solving the problem]

[0009] The discharge wire for an electrostatic precipitator of the present invention constitutes the discharge electrode of an electrostatic precipitator and is used in a suspended state, comprising: a discharge wire body; a locking part provided on the upper end side of the discharge wire body and locked to a suspension part from which the electrostatic precipitator discharge wire is suspended; a weight provided on the lower end side of the discharge wire body; and a weight position adjustment part that adjusts the vertical position of the weight when it is suspended from the suspension part.

[0010] Furthermore, it is preferable that the discharge wire for an electrostatic precipitator of the present invention comprises a plurality of locking parts, each of which is detachably engaged with the suspension part, and which are arranged at intervals in the direction of extension of the discharge wire body on the upper end side of the discharge wire body.

[0011] Furthermore, it is preferable that the discharge wire for the electrostatic precipitator of the present invention has a hook-shaped suspension portion, and the locking portion is an annular member through which the tip of the hook can be inserted.

[0012] Furthermore, it is preferable that the discharge wire for an electrostatic precipitator of the present invention has a weight suspension portion formed at the lower end of the discharge wire body for suspending the weight, the weight has a weight locking portion formed on the weight for locking onto the weight suspension portion, and the weight position adjustment portion is arranged at intervals in the extending direction of the discharge wire body at the lower end of the discharge wire body and consists of a plurality of weight suspension portions, each of which the weight locking portion can be locked and detached.

[0013] Furthermore, it is preferable that the discharge wire for the electrostatic precipitator of the present invention has a weight locking portion that is a hook-shaped hook, and a weight suspension portion that is an annular member through which the tip of the hook can be inserted. [Effects of the Invention]

[0014] According to the present invention, even if the discharge wire body stretches, by moving the weight upward, it is possible to prevent the lower grid located on the lower side of the electrostatic precipitator from coming into contact with the weight, thereby reducing the maintenance costs associated with stretching the discharge wire body. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 is a perspective view showing a schematic configuration of an electrostatic precipitator according to one embodiment of the present invention. [Figure 2] Figure 2 is a schematic diagram of a discharge electrode and a dust collection electrode according to one embodiment of the present invention. [Figure 3] Figure 3 is a side view of the weight position adjustment section on the upper side of the discharge wire according to one embodiment of the present invention. [Figure 4] Figure 4 is a cross-sectional view AA of Figure 3 relating to one embodiment of the present invention. [Figure 5] Figure 5 is a schematic diagram of a discharge electrode and a dust collection electrode according to another embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0016] Figs. 1 to 4 show an embodiment of the present invention. Fig. 1 is a perspective view showing a schematic configuration of an electrostatic precipitator, Fig. 2 is a schematic view of a discharge electrode and a dust collecting electrode, Fig. 3 is a side view of a weight position adjusting portion on the upper side of a discharge wire, and Fig. 4 is a sectional view taken along the line A-A of Fig. 3.

[0017] The electrostatic precipitator 1 to which the discharge wire for an electrostatic precipitator of the present invention is applied is used to collect fine particles such as dust from waste gas generated in sulfuric acid mist treatment in the mining and industrial fields, aluminum refining exhaust gas treatment, waste incineration processes, and the like.

[0018] In the main body of the electrostatic precipitator 1 (not shown), as shown in Fig. 1, an upper grid 10 extending horizontally on the upper side, a lower grid 20 extending horizontally on the lower side, a dust collecting electrode 30 provided between the upper grid 10 and the lower grid 20 for attracting fine particles contained in waste gas, a discharge electrode 40 to which a high voltage is applied, and a washing water supply pipe 50 for circulating washing water supplied to the dust collecting electrode 30 are provided.

[0019] The dust collecting electrode 30 is composed of a plate-like member having a smooth outer surface made of conductive FRP (fiber reinforced plastic). The dust collecting electrode 30 is partitioned by plate-like members extending in the vertical direction in one horizontal direction and in the other horizontal direction orthogonal to the one direction, whereby a plurality of spaces extending in the vertical direction are formed in each of the one horizontal direction and the other horizontal direction. That is, the waste gas containing fine particles flows vertically through the plurality of spaces surrounded by the dust collecting electrode 30. The space formed by the plate-like member constituting the dust collecting electrode 30 is formed in a rectangular shape having a cross-sectional shape within a range of, for example, 35 cm or more and 50 cm or less.

[0020] The discharge electrode 40 is composed of an electrode rod 41 penetrating through a part of a plurality of spaces extending in the vertical direction in the dust collecting electrode 30 and connecting the upper grid 10 and the lower grid 20, and a discharge wire 42 as the discharge wire for an electrostatic precipitator of the present invention suspended from the upper grid 10.

[0021] By applying a high voltage to the discharge electrode 40, the above-described electrostatic precipitator 1 forms an electric field between the discharge electrode 40 and the dust collecting electrode 30, causing corona discharge. As a result, ions with negative charges are generated between the discharge electrode 40 and the dust collecting electrode 30. The ions with negative charges bind to the fine particles, and the fine particles with negative charges adhere to the dust collecting electrode 30 with a positive charge. The fine particles adhering to the dust collecting electrode 30 are detached from the dust collecting electrode 30 by the washing water supplied from the washing water supply pipe 50 and discharged to the outside of the electrostatic precipitator 1.

[0022] As shown in FIG. 2, the discharge wire 42 has a discharge wire body 42a, a plurality of locking portions 42b provided on the upper end side of the discharge wire body 42a and locked to the hanging portion 11 provided on the upper grid 10, and a weight 42c provided on the lower end side of the discharge wire body 42a. Here, the hanging portion 11 is a hook formed in a hook shape.

[0023] As shown in FIG. 4, the discharge wire body 42a has a copper core wire 42a1 and a lead coating layer 42a2. The core wire 42a1 has a circular cross-section with an outer diameter dimension in the range of, for example, 1.0 mm or more and 2.0 mm or less. The coating layer 42a2 has a cross-section formed in a regular hexagonal shape with each side curved in a concave shape. Further, as shown in FIG. 2, a plurality of barbs 42a3 are provided on the discharge wire body 42a so as to project outward in the radial direction of the discharge wire body 42a at intervals in the extending direction and the circumferential direction of the discharge wire body 42a to generate corona discharge.

[0024] Multiple locking portions 42b are arranged at intervals in the extending direction of the discharge wire body 42a, and each is detachably engaged with the suspension portion 11. Each of the multiple locking portions 42b is an annular member through which the hook-shaped tip of the suspension portion 11 can be inserted. Each annular member used as a locking portion 42b has an outer diameter of 50 mm and an inner diameter of 35 mm. As shown in Figures 2 and 3, the multiple locking portions 42b are formed on the upper end of the discharge wire body 42a by wrapping the upper end portion of the discharge wire body 42a around the outer circumference of multiple annular members arranged at intervals and fixing them by brazing. Each of the multiple locking portions 42b is arranged at intervals of 8 cm to 12 cm in the extending direction of the discharge wire body 42a.

[0025] The weight 42c applies tension to the discharge wire body 42a by its own weight when the discharge wire 42 is suspended from the suspension part 11. As shown in Figure 2, the weight 42c is formed in a cylindrical shape at the lower end of the discharge wire body 42a, extending along the direction of extension of the discharge wire body 42a. The weight 42c has a flange portion 42c1 formed at its upper end, extending radially outward in the circumferential direction. When the discharge wire 42 is suspended from the suspension part 11, the flange portion 42c1 of the weight 42c is positioned above the upper surface of the lower grid 20, and the lower side is inserted through an opening 21 formed in the lower grid 20.

[0026] Here, the discharge wire 42 has a weight position adjustment section for adjusting the vertical position of the weight 42c while it is suspended from the suspension section 11. The weight position adjustment section in this embodiment is composed of a plurality of locking sections 42b that are arranged at intervals in the direction of extension of the discharge wire body 42a on the upper end side of the discharge wire body 42a, and each locking section 42b is detachably engaged with the suspension section 11.

[0027] In the discharge wire 42 configured as described above, when an unused discharge wire 42 is suspended from the suspension part 11, the uppermost of the multiple locking parts 42b is locked to the suspension part 11.

[0028] The discharge wire body 42a, while suspended from the suspension part 11, is subjected to tension due to its own weight and the weight of the counterweight 42c, and therefore elongates over time.

[0029] Therefore, the worker performing maintenance on the electrostatic precipitator 1 detaches the locking portion 42b that is locked to the suspension portion 11 from the suspension portion 11, and locks one of the locking portions 42b located lower than the locking portion 42b that was locked to the suspension portion 11 to the suspension portion 11. As a result, the elongated discharge wire 42 moves upward as a whole while suspended from the suspension portion 11, causing the weight 42c to move upward, and preventing the upper surface of the lower grid 20 from coming into contact with the flange portion 42c1 of the weight 42c.

[0030] As described above, the discharge wire for an electrostatic precipitator of this embodiment is a discharge wire 42 that constitutes the discharge electrode 40 of the electrostatic precipitator 1 and is used in a suspended state, and the discharge wire 42 comprises a discharge wire body 42a, a locking part 42b provided on the upper end side of the discharge wire body 42a and locked to a suspension part 11 that suspends the discharge wire 42, a weight 42c provided on the lower end side of the discharge wire body 42a, and a weight position adjustment part that adjusts the vertical position of the weight 42c when it is suspended from the suspension part 11.

[0031] As a result, even if the discharge wire body 42a stretches, the weight 42c can be moved upward to prevent contact between the upper surface of the lower grid 20 and the flange portion 42c1 of the weight 42c, thereby reducing the maintenance costs associated with stretching the discharge wire body 42a.

[0032] Furthermore, it is preferable that the weight position adjustment section is arranged at intervals in the direction of extension of the discharge wire body 42a on the upper end side of the discharge wire body 42a and consists of a plurality of locking parts 42b that can be freely engaged with and disengaged from the suspension part 11.

[0033] This makes it possible to select from multiple locking parts 42b and lock them to the suspension part 11, thereby adjusting the vertical position of the weight 42c at the same time as suspending the discharge wire body 42a from the suspension part 11, and thus suppressing an increase in the amount of work required during maintenance.

[0034] Furthermore, it is preferable that the suspension portion 11 is a hook formed in the shape of a hook, and the locking portion 42b is an annular member through which the tip of the hook can be inserted.

[0035] This makes it possible to suspend the discharge wire 42 from the suspension part 11 by attaching the annular member to the hook, thus making it easier to suspend the discharge wire 42 from the suspension part 11.

[0036] Figure 5 shows another embodiment of the present invention and is a schematic diagram of the discharge electrode and dust collection electrode. Components similar to those in the above embodiment are denoted by the same reference numerals.

[0037] In this embodiment, the discharge wire 42 is provided with a locking portion 42b on the upper end side of the discharge wire body 42a. Furthermore, in this embodiment, the discharge wire 42 is configured so that a weight 42c can be detachably attached to the discharge wire body 42a.

[0038] Multiple weight suspension parts 42d are formed on the lower end of the discharge wire body 42a for suspending a weight 42c. The weight 42c also has a weight locking part 42c2 that engages with the weight suspension parts 42d. Here, the weight locking part 42c2 is a hook-shaped component.

[0039] Multiple weight suspension parts 42d are arranged at intervals in the extending direction of the discharge wire body 42a, and each weight locking part 42c2 can be engaged and disengaged. Each of the multiple weight suspension parts 42d is an annular member through which the hook-shaped tip of the weight locking part 42c2 can be inserted. Each annular member has an outer diameter of 50 mm and an inner diameter of 35 mm. The multiple weight suspension parts 42d are formed on the lower end side of the discharge wire body 42a by wrapping the lower end member of the discharge wire body 42a around the outer circumference of the multiple annular members arranged at intervals and fixing them by brazing. Each of the multiple weight suspension parts 42d is arranged at intervals of 8 cm to 12 cm in the extending direction of the discharge wire body 42a.

[0040] In this embodiment, the weight position adjustment section is arranged at intervals in the extending direction of the discharge wire body 42a on the lower end side of the discharge wire body 42a and consists of a plurality of weight suspension parts 42d, each of which has a weight locking part 42c2 that can be engaged and disengaged.

[0041] In the discharge wire 42 configured as described above, when an unused discharge wire 42 is suspended from the suspension part 11, the locking part 42b on the upper end of the discharge wire body 42a is locked to the suspension part 11, and the weight locking part 42c2 is locked to the lowest weight suspension part 42d among the multiple weight suspension parts 42d. As a result, the discharge wire body 42a is locked to the suspension part 11, and the weight 42c is locked to the discharge wire body 42a.

[0042] The discharge wire body 42a, while suspended from the suspension part 11, is subjected to tension due to its own weight and the weight of the counterweight 42c, and therefore elongates over time.

[0043] Therefore, the worker performing maintenance on the electrostatic precipitator 1 detaches the weight locking portion 42c2, which is locked to the weight suspension portion 42d, from the weight suspension portion 42d, and locks the weight locking portion 42c2 to a weight suspension portion 42d located above the weight suspension portion 42d that was previously locked to it. As a result, while the elongated discharge wire 42 remains suspended from the suspension portion 11, only the weight 42c moves upward, making it possible to prevent the upper surface of the lower grid 20 from coming into contact with the flange portion 42c1 of the weight 42c.

[0044] Thus, in this embodiment, similar to the previous embodiment, even if the discharge wire body 42a stretches, the weight 42c can be moved upward to prevent contact between the upper surface of the lower grid 20 and the flange portion 42c1 of the weight 42c, thereby reducing the maintenance costs associated with stretching of the discharge wire body 42a.

[0045] Furthermore, it is preferable that a weight suspension portion 42d for suspending a weight 42c is formed on the lower end side of the discharge wire body 42a, a weight locking portion 42c2 is formed on the weight 42c for locking with the weight suspension portion 42d, and the weight position adjustment portion is composed of a plurality of weight suspension portions 42d arranged at intervals in the extending direction of the discharge wire body 42a, each of which has a weight locking portion 42c2 that can be locked or detached.

[0046] This makes it possible to adjust the vertical position of the weight 42c by locking the weight locking part 42c2 with a weight lifting part 42d selected from among multiple weight lifting parts 42d, thereby suppressing an increase in the amount of work required during maintenance.

[0047] Furthermore, it is preferable that the weight locking portion 42c2 is a hook formed in the shape of a hook, and the weight suspension portion 42d is an annular member through which the tip of the hook can be inserted.

[0048] This makes it possible to suspend the weight 42c from the discharge wire body 42a by attaching a hook to the annular member, thus making the process of suspending the weight 42c from the discharge wire body 42a much easier.

[0049] In the above embodiment, the weight position adjustment section was shown to consist of a plurality of locking parts 42b that are detachably engaged with the suspension part 11, or a plurality of weight suspension parts 42d, each having a weight locking part 42c2 that is detachably engaged with the suspension part 11, but it is not limited to these. The weight position adjustment section may be formed on both sides of the discharge wire body 42a, consisting of a plurality of locking parts 42b that are detachably engaged with the suspension part 11, and a plurality of weight suspension parts 42d, each having a weight locking part 42c2 that is detachably engaged with the suspension part 11. [Explanation of Symbols]

[0050] 1. Electrostatic precipitator 11 Hanging part 30 Dust collection electrode 40 Discharge electrodes 42 Discharge lines 42a Discharge wire body 42b Locking part 42c weight 42c2 Weight locking part 42d Weight suspension part

Claims

1. A discharge wire for an electrostatic precipitator, which constitutes the discharge electrode of an electrostatic precipitator and is used in a suspended state, The discharge wire for the electrostatic precipitator is, The discharge wire body and A locking portion is provided on the upper end side of the discharge wire body and is engaged with the suspension portion that suspends the discharge wire for the electrostatic precipitator, A weight provided on the lower end side of the discharge wire body, It includes a weight position adjustment unit that adjusts the vertical position of the weight while it is suspended from the suspension part. Discharge wire for electrostatic precipitators.

2. The weight position adjustment section is arranged at intervals along the extending direction of the discharge wire body on the upper end side of the discharge wire body and consists of a plurality of locking parts, each of which is detachably engaged with the suspension part. The discharge wire for an electrostatic precipitator as described in claim 1.

3. The aforementioned suspension part is a hook formed in the shape of a hook, The locking portion is an annular member through which the tip of the hook can be inserted. The discharge wire for an electrostatic precipitator according to claim 2.

4. A weight suspension part for suspending the weight is formed at the lower end of the discharge wire body. The aforementioned weight has a weight locking portion that is locked to the weight suspension portion, The weight position adjustment section is arranged at intervals along the extending direction of the discharge wire body on the lower end side of the discharge wire body and consists of a plurality of weight suspension parts, each of which the weight locking portion can be engaged and disengaged. The discharge wire for an electrostatic precipitator as described in claim 1.

5. The weight locking portion is a hook formed in the shape of a hook, The weight-suspending portion is an annular member through which the tip of the hook can be inserted. The discharge wire for an electrostatic precipitator as described in claim 4.

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