JPH0647563Y2 - Electric dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electrostatic precipitator.

[Conventional technology]

The dust in the gas discharged from the boiler is usually collected by the electric dust collector and discharged outside the machine. In this case, in order to uniformly disperse the gas entering the electrostatic precipitator over the entire surface of the electrostatic precipitator, a rectifying plate 2 is installed in the inlet throttle duct 1 as shown in FIGS. 4 to 6. Further, a plurality of gas blocking plates 7 which are horizontal and welded and fixed are attached at a predetermined interval to the lowermost portion, the lower end of the flow regulating plate 2a. In the figure, 3 is an electrode and 4 is a hopper.

[Problems to be solved by the device]

Since the horizontal gas blocking plates 7 were attached to the lower end of the conventional flow straightening plate 2a at appropriate intervals for the purpose of preventing gas blow-through, there were the following problems.

(1) Dust a (FIG. 5) gradually accumulates on the horizontally installed gas blocking plate 7, and when operating for a long time, the dust on the gas blocking plate 7 spreads over the entire surface. The lower part of the current plate 2 is closed.

(2) When the dust that adheres to and accumulates on the inlet throttle duct 1 and the inner wall surface of the flue partly separates from the wall surface due to gas pressure, temperature change, or the like and falls, the gas blocking plate 7
It accumulates on top and the lower part of the current plate 2 is closed.

(3) As a result, the amount of dust on the gas blocking plate 2 gradually increases with the progress of operation, and the gas dispersion in the electrostatic precipitator becomes uneven, which reduces the dust collecting performance of the electrostatic precipitator. Come here.

[Means for solving problems]

 The present invention takes the following measures to solve the above problems.

That is, as an electrostatic precipitator, a throttle duct at the inlet, and a plurality of rectifying plates arranged horizontally on a substantially vertical plane facing the front wall intersecting with the axis of the electrostatic precipitator of the throttle duct. And a plurality of rectangular suspension type gas cutoff plates, the upper end of which is oscillatably suspended along the lowermost end of the straightening vane, and the lower end of the suspended gas cutoff plate is predetermined with the front wall. To be in the interval.

[Action]

By the means described above, the lower end of the suspension type gas blocking plate is usually located at a distance from the front wall so that the gas does not blow through, so that the suspension type gas blocking plate functions like a conventional gas blocking plate. Further, the fine dust that normally drops does not accumulate on the suspension gas barrier plate, passes through the gap between the suspension gas barrier plate and the front wall, and falls downward. In addition, the suspended gas blocking plate that separates from the inlet throttle duct and the inner wall of the flue and has fallen can be freely rotated around the upper edge of the suspension type gas blocking plate. The gap is pushed open and falls easily. In this way, it is possible to prevent the lower side of the current plate from being blocked by dust.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view of a front portion, FIG. 2 is a detailed view of a portion II of FIG. 1, and FIG. 3 is a view taken along the line II-II of FIG.

The parts described in the conventional example are omitted to avoid redundancy, and the parts relating to the present invention will be mainly described.

In FIG. 2 and FIG. 3, a plurality of rectangular suspension type gas blocking plates 5 are arranged adjacent to each other, with the upper end being close to the lower end of the lowermost straightening plate 2a, and the right and left upper ends being the straightening plates. Hook 6 to the lower end of 2a. At this time, the vertical length of the suspension type gas blocking plate 5 is determined so that the distance l between the lower end thereof and the front wall 1a of the inlet throttle duct 1 becomes a predetermined value.

In the above configuration, the gas flowing into the inlet throttle duct 1 passes through the flow straightening plate 2 and becomes a uniform flow over the entire surface of the electrostatic precipitator. Here, the dust in the gas is collected by the electrode 3, once accumulated in the hopper 4, and then discharged outside the machine by a conveyor or the like (not shown). At this time,
Since the gap 1 with the front wall 1a of the suspension type gas blocking plate 5 is determined so as not to blow through the gas, the gas uniformly flows into the electrode 3 as in the conventional case.

Further, the fine dust that normally falls does not accumulate on the suspension type gas blocking plate 5 and passes through the gap 1 between the suspension type gas blocking plate 5 and the front wall 1a and falls to the hopper. In addition, the suspended gas blocking plate 5 independently separates the lump dust (about 300 to 500 mm square, about 20 to 30 mm thick) that has fallen off from the inlet throttle duct 1 and the inner wall surface of the flue, and around the upper edge thereof. Since it freely rotates, the gap 1 at the lower end of the gas blocking plate 5 in contact with the lump dust is pushed open and easily falls downward.

In this way, the lower side of the current plate is prevented from being blocked.

The above interval l is 0 when viewed only from the prevention of gas blow-through.
Although it is better to be close to the above, it has been confirmed by the actual machine that there is no particular problem if it is about 100 mm when viewed from both sides to prevent dust accumulation.

[Effect of device]

 As described above, the present invention has the following effects.

(1) The fine dust that normally falls falls through the gap between the suspension gas blocking plate and the front wall and falls downward.

(2) The lumpy dust that has peeled off from the throttle duct and the inner wall surface of the flue and has fallen can easily drop by opening the lower end of the suspension type gas blocking plate.

(3) As a result, the clogging phenomenon due to dust accumulation below the straightening vane is eliminated, so that deterioration of the dust collecting performance of the electrostatic precipitator due to uneven gas distribution can be prevented.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a front portion of an embodiment of the present invention, FIG. 2 is a detailed view of a II portion of FIG. 1 of the same embodiment, and FIG. 3 is III- of FIG. 2 of the same embodiment. III view, FIG. 4 is a longitudinal sectional view of a front portion of the conventional example, FIG. 5 is a detailed view of V portion of the conventional example, and FIG. 6 is a VI-VI perspective view of the conventional example. 1 …… Inlet throttle duct, 1a …… Front wall, 2,2a …… Rectifier plate, 3 …… Electrode, 4 …… Hopper, 5 …… Suspended gas blocking plate, 6 …… Hook, 7 …… Gas blocking Plate (fixed type), l ... Interval.

Claims (1)

[Scope of utility model registration request] Claims: 1. A throttle duct at the inlet, a plurality of straightening vanes horizontally arranged substantially vertically, facing a front wall intersecting with the axis of an electrostatic precipitator of the throttle duct, and the same straightening vane. The lowermost end of the plate is provided with a plurality of rectangular suspension type gas blocking plates along which the upper ends are swingably suspended, and the lower end of the suspension type gas blocking plate is at a predetermined distance from the front wall. An electrostatic precipitator characterized by being present.