JP3212474B2 - Wet electric dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-capacity, high-speed parallel-plate wet-type electrostatic precipitator having a fixing device for a precipitating electrode.

[0002]

2. Description of the Related Art In a boiler plant, a wet electric dust collector (hereinafter referred to as wet EP) is installed downstream of a flue gas desulfurization unit for collecting sulfuric acid mist, which is a cause for preventing generation of purple smoke. .

[0003] The conventional wet EP is not suitable for additional installation in an existing plant or new installation in a relatively small place because the apparatus itself is quite large.

Therefore, a compact wet EP that can be incorporated in a flue has become necessary.

In order to make a wet type EP device compact,
It is necessary to reduce the main gas passage cross-sectional area as compared with the conventional apparatus.

For this purpose, it is necessary to improve the performance so as to cope with the gas whose flow velocity has increased. In response to this demand, a vertical flow type high performance wet EP (FIGS. 5 and 6) has already been developed.

However, in order to install the vertical flow type, it is necessary to provide a vertical portion in the flue. In addition, it is difficult to increase the capacity due to its structure. Therefore, development of a large capacity, high-speed, parallel-plate wet EP is desired.

[0008]

In order to realize a compact wet EP that can be incorporated in a flue, it is necessary to be able to cope with a high flow velocity of 4 m / s or more in consideration of the flow velocity in the flue. For this purpose, it is indispensable to improve the performance of dust (mist) collection.

For this purpose, the current density must be increased. To increase the current density, it is necessary to narrow the electrode pitch (narrow spacing).

However, the dust collecting electrode plates in the conventional wet EP are fixed to the upper and lower sides to some extent,
Adjacent dust collecting electrodes are not connected to each other, and the dust collecting electrode plates are thin and long, so that when the flow velocity exceeds 4 m / s, each dust collecting electrode plate vibrates, and Because of its large amplitude, it is difficult to keep the pitch between the discharge electrode and the dust collection electrode constant.

In the case of narrow spacing, fluctuations in the electrode pitch greatly affect the performance.
It is important to keep this constant.

An object of the present invention is to provide an apparatus capable of solving these problems.

[0013]

The wet electric precipitator according to the present invention is arranged so that its plane is parallel to the gas flow.
A plurality of collection electrode plates a wet <br/> electric precipitator was side-by-side along the gas stream, the left and right end portions of the dust collecting electrode plate
Has a thicker part, and the adjacent dust collecting electrode plate
A pair of parts sandwiching the part where the thickness of the side end is thicker from both sides
It is characterized by being fixed with a connecting plate .

That is, in a large-capacity, high-speed, parallel-plate, wet-type EP dust collecting electrode, adjacent dust collecting electrode plates are connected at several places in order to suppress vibration under a high-speed flow. for dust collecting electrode and the dust collecting electrode at the most downstream portion of the parts, by engaged binding with intermediate spacers, characterized in that to keep the electrode pitch of the collection electrode and the discharge electrode constant.

[0015]

When the dust collecting electrodes are fixed one by one as in a conventional electric dust collector, considerable vibration is observed, but as in the electric dust collector of the present invention. By connecting the adjacent dust collecting electrodes, vibration can be reduced, and the electrode pitch with the discharge electrode can be kept constant.

Therefore, a stable average current density can be maintained, and dust (mist) can be collected with high efficiency even under a high-speed flow.

[0017]

【Example】

(First Embodiment) A first embodiment of the present invention is shown in FIGS.

As shown in FIGS. 1 to 3, the dust collecting electrode plate 2 is sandwiched between the connecting plates 3 of the dust collecting electrode plates and the spacers 4 of the connecting plates constituting the fixing device 1 for the dust collecting electrode plates. Adjacent dust collecting electrode plates are connected to each other.

Further, as shown in FIG.
Then, the vibration of the dust collecting electrode plate is suppressed by attaching the mounting plate 7 to the intermediate spacer plate 5 with the dust collecting electrode plate at the most upstream portion and the dust collecting electrode plate at the most downstream portion sandwiched therebetween.

(Second Embodiment) By using a flat bar 8 or the like for connecting a dust collecting electrode plate as shown in FIG. 4, vibrations are suppressed by connecting adjacent dust collecting electrode plates to each other.

[0021]

Since the present invention is configured as described above, it has the following effects.

(1) The electric dust collecting apparatus of the present invention having a fixing device of the dust collecting electrode plate reduces vibration of the dust collecting electrode plate even under a high-speed flow exceeding 4 m / s, which cannot be handled by the conventional wet EP. Can be suppressed.

(2) Therefore, in narrow spacing, even at a high speed, the electrode pitch is kept constant, so that a stable average current density can be obtained below the spark voltage.

(3) As a result, the performance can be improved as compared with the conventional wet EP, and it is possible to cope with a high-speed flow.

[Brief description of the drawings]

FIG. 1 is an assembled sectional view of a wet type electrostatic precipitator according to a first embodiment of the present invention.

FIG. 2 is a view showing a fixing device of the dust collecting electrode plate of the first embodiment.

FIG. 3 is a diagram showing claws of an intermediate spacer according to the first embodiment.

FIG. 4 is a view showing a connection flat bar of a dust collecting electrode plate according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a conventional vertical flow type high-speed wet-type electric precipitator.

FIG. 6 is a diagram showing details of the electrode in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dust collecting electrode plate fixing device, 2 ... Dust collecting electrode plate, 3 ... Connecting plate of a dust collecting electrode plate, 4 ... Spacer of a connecting plate, 5 ... Intermediate spacer, 6 ... Intermediate spacer claw, 7 ... Mounting plate , 8: Connection flat bar of the collecting electrode plate, 9: Spacer, 10: Bolt and nut.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-5244 (JP, A) JP-A-59-225759 (JP, A) JP-A-51-33362 (JP, A) 107153 (JP, U) Jiko 10-10381 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B03C 3/00-3/88

Claims (1)

(57) [Claims] (1) Arranging such that its plane is parallel to the gas flow.
A plurality of placed dust collecting electrode plates are arranged side by side along the gas flow.
And a wet electrostatic precipitator, the thickness was thickened portion on the left and right end portions of the dust collecting electrode plate
And the thicker side edges of adjacent dust collection electrode plates
, Which is fixed by a pair of connecting plates sandwiching the sheet from both sides .