JPH0753720Y2 - Electric dust collector cleaning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a cleaning device for an electrostatic precipitator.

[Conventional technology]

In the conventional electrostatic precipitator, an ionizer that charges dust particles in the dust-containing gas in the process of passing the dust-containing gas inside the container that has a dust-containing gas inlet and a clean gas outlet, and a downstream of this ionizer. There is an electrostatic precipitator provided with a collector for collecting the charged particles on the side and a cleaning device for cleaning the collected dust particles.

In this electrostatic precipitator, as the operating time increases, the amount of dust particles accumulated on the electrode plate of the ionizer and the electrode plate of the collector increases, and when the dust collection efficiency decreases, the operation of the electrostatic precipitator is stopped and the cleaning device removes the ionizer. After cleaning the dust particles by spraying cleaning water or other cleaning liquid on the electrode plate and collector electrode plate, the ionizer and collector are dried, and then the electrostatic precipitator is restarted.

[Problems to be solved by the device]

The conventional electrostatic precipitator cleaning device has a problem that the number of nozzles is large because the nozzles for spraying the cleaning water are fixed and a large amount of cleaning water is sprayed, resulting in poor cleaning efficiency. .

As an example of an invention that solves this problem, Japanese Patent Publication No. Sho 54-8912
There is an electrostatic filter device described in Japanese Patent Publication No. JP-A-2003-13898, in which the injection pipe 21 has one end screwed into a connecting member 22 having a right angle, and the connecting member is a header rotatably via a bushing and a sleeve. The tube 16 is attached to one end of a T-shaped connecting member 23. Then, in the third column, line 19 to line 23 of the above publication, "In addition, since the injection pipe is pivotally attached at one end thereof to one arm, it is automatically placed in the vertical position when not in use. It settles down, and because of the header tube, the flow resistance to the gas flow to be treated can be minimized. ], There is a problem that dust particles in the gas to be treated may accumulate on the connecting member 22 and hinder the movement of the connecting member 22.

An object of the present invention is to provide a cleaning device for an electrostatic precipitator that can solve such problems.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides an ionizer for charging dust particles in a dust-containing gas in the process of passing the dust-containing gas into an inside of a body having a dust-containing gas inlet and a clean gas outlet. A collector for collecting the charged particles on the downstream side of the ionizer, and an electrostatic precipitator including a cleaning device for washing off the collected dust particles, the cleaning device includes a swirling cleaning water injection nozzle, A swirling cleaning nozzle rotatably fits a rotary joint to the outer periphery of the shaft cylinder through a gap through which the cleaning water appropriately leaks, and through holes on both sides of this rotary joint that communicate with the cavity of the shaft cylinder. Characterized by connecting a pair of arms having, and at the tip of each arm, a nozzle having an injection hole communicating with the through hole is installed so that their spraying directions are inclined in mutually opposite directions, (2) Practical new In the cleaning device for an electrostatic precipitator according to claim 1 of the draft registration, the pair of arms are formed of arms having different lengths.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
Is an electric dust collector body having an inlet 3 for the dust-containing gas 2 and an outlet 5 for the clean gas 4. Inside the body 1, a pre-filter 6, an ionizer 7, a collector 8, an after-filter 9, and a fan 10 are provided in order from the upstream side to the downstream side, and the pre-filter 6 is swirling on the upstream side of the pre-filter 6 while rotating. Provided with a cleaning nozzle 11 for spraying cleaning water on
On the upstream side of the ionizer 7, a washing nozzle 12 for spraying the washing water to the ionizer 7 and the collector 8 while swirling is provided, and these washing nozzles 11 and 12 are respectively provided with water supply pipes 13 and 14 connected to a pump or the like. It is connected.

The cleaning nozzles 11 and 12 are rotatably fitted to the outer periphery of the tip end portion of the shaft cylinder 15 through a gap through which the cleaning water of the rotary joint 16 appropriately leaks, as shown in FIGS. ,
On both sides of the rotary joint 16, a pair of arms 19, 19 having through holes 18, 18 communicating with the hollow portion 17 of the shaft cylinder 15 and having the same length are connected, and each arm 19, 19 is connected. At the tip of, the injection holes 20, which communicate with the through holes 18, 18 of the arms 19, 19, respectively.
Nozzles 21, 21 having 20 are arranged such that their jetting direction is centerline 22.
To the opposite side from each other at an appropriate angle, for example 40 °
It is installed so as to be inclined, and the base end portion of the shaft cylinder 15 is provided with a connection port 23 that communicates with the hollow portion 17 of the shaft cylinder 15 and that connects the water supply pipes 13 and 14.

In the cleaning apparatus for an electrostatic precipitator having the above configuration, the fan 10 is driven to apply the dust-containing gas 2 from the inlet 3 to the body 1 while the high voltage is applied to the electrode plate of the ionizer 7 and the electrode plate of the collector 8. The gas is sucked into the interior, passed through the pre-filter 6, the ionizer 7, and the collector 8 in this order, and the gas 4 that has been cleaned by collecting dust particles is sent out from the outlet 5 to continue the operation of the electrostatic precipitator. When the amount of dust particles collected on the electrode plate of the collector 8 increases and the filter material of the pre-filter 6 and the electrode plate of the ionizer 7 also become dirty and the dust collection efficiency starts to deteriorate, Stop the operation and pass the washing water through the water supply pipes 13 and 14 with a pump etc. to the washing nozzles 11 and 12.
Pump to. Then, the cleaning water passes through the hollow portion 17 of the shaft cylinder 15, the rotary joint 16, the through holes 18, 18 of the arms 19, 19 in this order, and is atomized from the injection holes 20, 20 of the nozzles 21, 21. At the same time as jetting, the rotary power due to the action of the spray pressures inclined in opposite directions from their centerlines 22 is transmitted from the respective nozzles 21, 21 to the rotary joint 16 via the arms 19, 19, so that the respective nozzles 21, 21 are Washing water is sprayed toward the pre-filter 6, the ionizer 7 and the collector 8 while swirling to wash them. During this time, the cleaning water continues to appropriately leak from the gap between the shaft cylinder 15 and the rotary joint 16, and the rotary sliding portion of the rotary joint 16 is constantly cleaned. There are no 16 rotation defects, and stable continuous turning and rotation are possible.

When the nozzle swirlable area according to the relationship between the installation angle of each of the nozzles 21 and 21 and the spray pressure is shown, a graph curve 24 shown in FIG.
It is in the upper area. When each nozzle 21, 21 is fixed like a conventional cleaning nozzle, the cleaning range is 7th.
In the figure, the area is narrow as shown by a pair of small circles 25, 25 with two-way diagonal lines, whereas when the nozzles 21, 21 are swung as described above, the cleaning range is 7
In the figure, as shown by one great circle 26 with a diagonal line in one direction, the range is wider.

When the nozzles 21 and 21 are installed at the tips of the arms 19 and 19 having the same length, in FIG. 7, a small range indicated by a small circle 27 without a diagonal line at the center of the great circle 26 is not present. As shown in FIG. 8, the cleaning nozzles 11 and 12 are provided as a pair of arms 2 having different lengths on both sides of the rotary joint 16 although they remain as a cleaning range.
8 and 29 are connected, and nozzle 2 is attached to the tip of each arm 28 and 29.
If the nozzles 21 and 21 are configured to be installed and the nozzles 21 and 21 are swung, the cleaning range thereof is as shown in FIG.
As shown by a pair of small circles 30 and 31 with two-way diagonal lines, the circle is swirled within the range of a large circle 32 with diagonal lines in one direction in the figure while partially intersecting with each other, so that there is no unwashed area.

[Effect of device]

Since the present invention is configured as described above, the number of cleaning nozzles can be reduced as compared with the conventional electrostatic precipitator cleaning device, and the nozzle spray of the conventional device and the device of the present invention shown in FIG. As is clear from the flow rate comparison graph, the spray amount of cleaning water can be reduced, and the cleaning effect can be increased accordingly. Moreover, since a part of the wash water is leaked from the gap between the shaft cylinder and the rotary joint, the leaked wash water can be used to wash the rotating part to prevent rotation failure. Further, by making the lengths of the arms different, the unwashed area can be eliminated. Also, because of the nozzle rotation, there is an advantage that no other power unit is needed.

[Brief description of drawings]

FIG. 1 is a schematic view for explaining an example of the structure of an electrode insulator drying device for an electrostatic precipitator according to the present invention, FIG. 2 is a perspective view showing an example of a cleaning nozzle, and FIG. 3 is a sectional view of a part of the cleaning nozzle. FIG. 4 is a side view, FIG. 4 is a left side view of FIG. 3, FIG. 5 is a top view of FIG. 3, FIG. 6 is a graph showing a swivelable curve depending on the nozzle installation angle, and FIG. 7 is an arm of the same length. 8 is a perspective view showing another example of the cleaning nozzle, and FIG. 9 is a pair of nozzles installed at the ends of arms having different lengths. And FIG. 10 is a graph showing a comparison of nozzle spray flow rates between the conventional apparatus and the apparatus of the present invention. 1 ... Body, 2 ... Dust-containing gas, 3 ... Inlet, 4 ... Clean gas, 5 ... Outlet, 7 ... Ionizer, 8 ... Collector, 11, 12 ... Washing nozzle, 15 ... Shaft cylinder, 16 …… Rotary joint, 17 …… Cavity, 18,18 …… Through hole, 19,19 …… Arm of the same length, 20,20 …… Injection hole, 21,21 …… Nozzle, 2
8, 29 ... Arms with different lengths.

Claims (2)

[Scope of utility model registration request] 1. An ionizer for charging dust particles in a dust-containing gas in the process of passing the dust-containing gas inside a container having an inlet for the dust-containing gas and an outlet for the clean gas, and a downstream side of the ionizer. In an electrostatic precipitator provided with a collector for collecting the charged particles and a cleaning device for washing off the collected dust particles, the cleaning device includes a swirling cleaning water jet nozzle, and the swirling cleaning nozzle is a barrel. A rotary joint is rotatably fitted to the outer periphery through a gap through which cleaning water appropriately leaks, and a pair of arms having through holes communicating with the hollow portion of the shaft cylinder are connected to both sides of the rotary joint. A cleaning device for an electrostatic precipitator, characterized in that a nozzle having an injection hole communicating with the through hole is installed at a tip of each of the arms so that their spray directions are inclined in directions opposite to each other. 2. A cleaning device for an electrostatic precipitator according to claim 1, wherein the pair of arms are arms having different lengths.