JPS6118455A - Improvement of dust collecting polar plate of wet electrical dust precipitator - Google Patents

Abstract

PURPOSE:To make the assembly of the titled apparatus easy and to form excellent stream membranes with less quantity of liquid by using flexible cloth and films or the like as the dust collecting polar plates, fixing the reinforcing materials such as a pipe to the upper and lower ends thereof and stretching them so as to become plane as a whole. CONSTITUTION:As the flexible sheet-shaped materials making dust collecting polar plates 10, the cloth contg. woven fabric plus nonwoven fabric and plastic sheet are used and many unevennesses are distributed on the surface on the average. The positions as the polar plates are decided by fixing the supporting members 11 such as pipes and round rods to the upper and lower ends of the sheets and providing the supporting members 11 to the prescribed positions and the degree of evenness is maintained by giving tension to the polar plates with the spring or the like via the supporting members 11 of the lower ends. Then, liquid is fed from the stream spraying pipes 30 positioned to the upper ends thereof to form the stream membranes and thereby the dust collecting polar plate 10 groups are formed as a whole.

Description

[Detailed description of the invention] Technical field The present invention relates to improvements in the dust collection electrode plate of a wet type electrostatic precipitator.

The collecting plates of prior art electrostatic precipitators usually consist of electrically conductive plates, to which charged particles present in the air are attracted by electric force.

This electrode plate is an important element that affects the performance of the electrostatic precipitator, and unless the sheet metal area is bent or distorted, it will not function as a precipitator.

In a practical machine, this plate is o, 6~1-, length 4
It is common for the kiln to consist of a large number of thin plates up to 6 meters in length, stacked vertically, and when assembling, care must be taken to ensure that the long thin plates do not get damaged or bent. It is a very time-consuming process, as the fish must be caught once, inserted into the aircraft, and placed at predetermined positions at precise intervals.

In addition, a large portion of the total weight of the electrostatic precipitator is occupied by the dust collecting electrode plate, which becomes a problem when the dust collector plate 11 is installed in a high place, for example.

A wet electrostatic precipitator is a special type of electrostatic precipitator.
This means that water or other liquid is constantly flowed over the electrode plate to prevent dust from adhering to it and to maintain the surface of the plate so that it is easy for electrical discharge to occur.

In this wet electrostatic precipitator, it is a problem to form a water film uniformly on the dust collecting electrode plate, and in the case of metal, the friction with water is small.

Water flowing down the surface is accelerated the further down it goes.

The film easily ruptures and aggregates to form a streak-like flow.For example, the method of simply spraying liquid with a spray nozzle requires a large amount of liquid because the spray is uneven. In addition, in the method where the dust collecting electrode plate is made into a cylinder and the liquid flows down from the overflow weir at the top to the inner surface of the cylinder,
In order to uniformly overflow from a large number of cylinders, there is a technical difficulty in maintaining the levelness of the upper ends of all cylinders.
This also results in a large amount of liquid being required.

This proposal concerns the dust collection electrode plate of this wet type dust collector, and its gist is that instead of the conventional rigid plate, flexible cloth, film, etc. are used, and the surface is always conductive. of liquid (usually water).

This is used as a dust collecting electrode plate.

Structure of the Invention According to the present invention, there is provided a dust collection electrode plate for a wet electrostatic precipitator, comprising:
Provided is a dust collection electrode plate made of a flexible sheet-like material other than metal, whose upper and lower edges are supported by linear support members and stretched so as to form a flat surface as a whole. .

In the present invention, flexible sheet materials include cloth foils and plastic sheets. Cloth foil is woven fabric.

Contains two woven and knitted fabrics. The plastic sheet is preferably arranged on its surface in a number of evenly distributed layers so that the fluid can flow freely and without any deviation of the flow.

Preferably, the sheet material is porous and hydrophilic.

A plastic sheet with a roughened surface.

The surface is made of foamed plastic sheet, and the other side is made of fiber cloth.

As a practical structure, there are pipes at the top and bottom ends.

By fixing a reinforcing material such as a round bar and placing the reinforcing material in a predetermined position, the position of the electrode plate is determined, and tension is applied to the electrode plate using a nine-fold reinforcement, a spring, etc. through the reinforcing material at the lower end. The plate maintains its flatness, and liquid is supplied from its upper end to create a water film, forming a collection of dust-collecting electrode plates as a whole.

Effect of the invention The electrode plate according to the present invention is constructed in this way.

・+1) Since the surface is not smooth, even if the fluid is supplied somewhat unevenly or flows down a considerable distance, a fluid film can be created extremely easily over the entire surface, and the amount of liquid is small. Finish.

2) When assembling, there is no need to fish it up to a high place like with non-flexible stainless steel sheets, just like lifting a banner.

Easy to install.

3) Work such as replacing the electrode plate after long-term use and removing deposits can be done easily.

4) During daily maintenance, when scale adhering to the electrode plates is removed using a jet water nozzle, the electrode plates are deformed by the water pressure and easily peel off.

5) The total weight is very light and it can be easily installed in high places such as on the roof of a building or in the middle of an exhaust duct.

6) When the gas to be treated is corrosive, a much cheaper cloth or film can be used instead of the conventionally used expensive corrosion-resistant metal.

It has many advantages.

Embodiment FIG. 1 is a sectional view showing a part of a wet type dust collector using the dust collecting electrode plate of the present invention. FIG. 2 is a perspective view of a portion of FIG. 1.

The dust collecting electrode plate 10 made of polyester woven fabric is supported by being wrapped around a support rod 11, and although the support rod is not shown, it is of course fixed at a predetermined position of the dust collector. The lower edge is similarly supported by a support rod, and the support rod at the lower edge also serves as a weight that pulls the cloth fabric downward. A discharge electrode supported by a frame 21 is arranged between the dust collecting electrode plates. A running water spray pipe '50 is provided above, from which water is sprayed onto the dust collecting electrode plate 11. Since this arrangement itself is known, there is no need to describe it in further detail.

In the case of polyester woven fabric, the amount of water required to form a water film with the same effect is reduced by 1/3 to 1/10 compared to the conventional metal plate dust collector plate. Moreover, the cost of installing this dust collecting electrode plate was reduced to 1/2 to 1/3 compared to the case of a conventional metal plate. (For metal plates, use a crane.

Requires a large number of workers. ) Furthermore, as a replacement for the woven fabric, a thin foamed polyurethane sheet (used for fabric F) was adhered to both sides of a polyvinyl chloride sheet. In this case, since the hydrophilicity is inferior to that of woven fabric, the reduction in water volume is not as great as that of woven fabric, but it is clearly reduced compared to conventional metal surfaces, and the advantages during assembly are the same as in the case of woven fabric. be.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a part of a wet type dust collector using the dust collecting electrode plate of the present invention. FIG. 2 is a perspective view of a portion of FIG. 1. In these figures. 10: Dust collecting electrode plate, 20: Discharge electrode, 11: Support member. Patent applicant MEB! □2゜Representative Patent Attorney Masahiro Matsui Figure 1 Figure 2 Procedural Amendment Statement August 6, 1982

Claims (1)

[Scope of Claims] 1. A dust collecting electrode plate for a wet electrostatic precipitator, which is made of a flexible sheet-like material other than metal, and whose upper and lower edges are supported by linear support members so that the entire plate is flat. A dust collecting electrode plate characterized in that it is stretched so as to be. 2. The dust collecting electrode plate according to claim 1, characterized in that it is made of fiber cloth. 3. The dust collecting electrode plate according to claim 1, characterized in that it is made of a plastic sheet having a large number of protrusions or protrusions evenly distributed on the surface to prevent the free flow of fluid. Something to do. 4. A dust collecting electrode plate according to claim 1, characterized in that it is made of a sheet of porous material. 5. The dust collecting electrode plate according to claim 1, characterized in that it is made of a sheet of a hydrophilic material.