JP2004329973A - Electric dust precipitator with washing function and dust collector using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric dust precipitator with a washing function capable of efficiently removing dust, smoke or soot suspended in gas over a long period, with reduced number of times of periodical maintenance and inspection of electrode members of the precipitator. <P>SOLUTION: The electric dust precipitator with the washing function is equipped with a pair or more of the electrode members of a charge electrode part and a dust collection electrode part housed and disposed in the vertical direction in a casing, and a fan blowing polluted gas upward from a lower part of the electrode members. In the casing housing the electrode members, a plurality of nozzles spraying washing water toward the electrode members are disposed in the vertical direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electrostatic precipitator with a cleaning function and a dust collecting device using the same, and in particular, reduces the number of regular maintenance and inspection of the electrode member of the electric precipitator, and reduces the number of times of maintenance in gas for a long time. The present invention relates to an electric precipitator with a washing function and a precipitator capable of efficiently removing dust such as floating dust, smoke, and oily smoke.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an electric dust collector is well known as a device for removing dust, smoke, and the like floating in a gas (Patent Document 1).
[0003]
[Patent Document 1] Japanese Patent Laid-Open No. 7-88299
An example of such an electrostatic precipitator will be described with reference to FIG. 6. FIG. 6 is a schematic configuration explanatory view of the electric precipitator. This device charges dust floating in the air by corona discharge. A charging electrode unit 20, a dust collecting electrode unit 21 for adsorbing and removing charged dust, a gas supply device 22 for supplying gas to each of the electrodes, a case 23 for accommodating the devices, and a case 23 formed in the case 23. And a power supply device (not shown). In this electric dust collector, the gas supply device 22 is used to flow contaminated air into the electric dust collector, and the dust present in the contaminated air is charged by the charging electrode unit 20, and then the dust collected in the subsequent stage is collected. Since it is made to adsorb by the electrode part 21 and fine dust can be collected efficiently, it is widely used.
[0005]
However, when the above-mentioned electrostatic precipitator is examined, the following problems have become apparent.
That is, since the contaminants are adsorbed on the charged electrode portion and the dust collecting electrode portion constituting the electrode member, it is necessary to periodically clean the electrode portion. Further, when the degree of gas contamination is high, there is a problem that the number of times of cleaning increases, and the maintenance cost for the cleaning cannot be ignored. Furthermore, the electric precipitator cannot be operated during cleaning, and it is necessary to suspend the work during that time.
[0006]
[Problems to be solved by the invention]
Therefore, the present invention, in order to solve the above problems, in the container, a charging electrode unit and a dust collection electrode unit as a set of electrode members, at least one or more sets are arranged in series in the vertical direction. The electrode member is configured such that the washing water can be constantly sprayed from a nozzle arranged in the container, and the dust collector with a cleaning function capable of collecting the contaminants while continuously cleaning the electrode member continuously or at predetermined time cycles. The purpose is to provide functions.
[0007]
[Means for Solving the Problems]
The technical solution adopted by the present invention is:
At least one set of an electrode member, which is a set of a charged electrode portion and a dust collection electrode portion, is housed and arranged in the case for an electrostatic precipitator at least in the vertical direction, and a pollutant gas flows upward from below the electrode member. An electrostatic precipitator with a cleaning function, comprising: a fan, and a plurality of nozzles for injecting cleaning water toward the electrode member are arranged inside the case that houses the electrode member.
Further, in the electric dust collector with a cleaning function, a plurality of the nozzles are vertically arranged inside the case so that the cleaning liquid ejected from the nozzle flows down naturally in each electrode portion.
The cleaning liquid may be used in a circulating manner.
Further, the cleaning liquid is a strongly alkaline electrolyzed water, wherein the electrostatic precipitator has a cleaning function.
A cleaning liquid storage tank for storing a cleaning liquid is formed at a lower portion of the case, and a cleaning mist generating blade for converting the cleaning liquid into a mist is disposed in the tank.
In addition, any one of the above-described electric dust collectors with a cleaning function, a duct for introducing a pollutant gas into the electric dust collector with a cleaning function, and a cleaning liquid supplied to the electric dust collector with a cleaning function. A dust collector, comprising: a pump; and a cleaning liquid tank that supplies a cleaning liquid to the pump.
[0008]
Embodiment
Hereinafter, preferred embodiments of the present invention will be described. FIG. 1 is a cross-sectional view of an electrode member of an electric precipitator used in the present invention, FIG. 2 is a front cross-sectional view of an electric precipitator with a cleaning function as an embodiment according to the present invention, FIG. FIG. 4 is a perspective view of a cleaning mist generating blade arranged in the electric dust collector with a washing function, and FIG. 5 is a configuration diagram of a dust collecting device using the above-mentioned electric dust collector.
The electrode member 1A of the electric precipitator according to the present invention comprises a pair of a charging electrode 2A having a substantially rectangular shape in plan view and a dust collecting electrode 3A as shown in FIG.
In FIG. 1, a charged electrode portion 2A constituting an electrode member 1A has a high voltage electrode 2 made of a screw rod or a thin wire and a low voltage electrode 3 made of a plate-like body alternately arranged in parallel at regular intervals. The high voltage electrode group is connected to the same type of electrodes. The terminal of the high voltage electrode 2 is connected to the power supply, and the end of the low voltage electrode is connected to the low voltage electrode. The high-voltage electrode 2 is not limited to a screw rod or a wire, but may be a rod having a large number of protrusions formed on the surface.
[0009]
On the other hand, the dust collecting electrode portion 3A is composed of a large number of opposing plate-like electrode groups in which high-voltage electrodes 7 and low-voltage electrodes 8 are arranged alternately and in parallel, and each of the electrodes 7, 8 has only the same polarity. The terminals of the high voltage electrode group are electrically connected in parallel with each other, and the terminals of the high voltage electrode group are connected to a power source via connection means 9 in the charging electrode portion as appropriate. The terminal of the low voltage electrode is connected to the low voltage electrode. In the drawing, 5 is an electrode case, 6 is a power supply line, and 10 is an electrode plate supporting insulator.
In addition, the electrode member 1A of the said electrostatic precipitator is the same as a conventional electrode member, and an effect is also the same as the conventional one.
[0010]
The electrode member 1A composed of one set of the charging electrode 2A and the dust collecting electrode 3A having the above-described configuration is housed in the electric dust collector case 11 as shown in FIGS. 1 and 2, one charging electrode 2A and two dust collecting electrodes 3A constitute a set of electrode members 1A. This is because if the dust collecting electrode 3A is composed of one piece, the weight of the dust collecting electrode 3A increases, and handling becomes inconvenient. The electrode 3A is divided into two parts. Further, in this example, the electrode case 5 is omitted because the electric dust collector case 11 is provided.
In this electrode member 1A, smoke and mist charged by the charging electrode 2A can be adsorbed and collected by the dust collecting electrode 3A. By arranging a plurality of sets of the electrode members 1A in series in the vertical direction in the electrostatic precipitator case 11 as shown in the drawing, the dust collecting ability can be enhanced.
[0011]
A configuration of an electric precipitator 50 with a cleaning function that incorporates a set of the charging electrode 2A and the precipitating electrode 3A having the above configuration will be described.
2 and 3, the electric precipitator 50 with a cleaning function includes an electric precipitator case 11, in which a charging electrode 2A is provided on a lower side of the electric precipitator case 11, and a dust collecting member is provided on an upper side thereof. The electrode 3A is arranged. Although one set of the electrode member 1A is shown in this example, a plurality of sets may be arranged in series in the up-down direction. Ceramics are used for the insulating portions 2G and 3G provided on the electrode member 1A. The reason is that, in the past, the insulator was used, but in the insulator, the cleaning liquid penetrated into the insulator, and the inconvenience that power could not be supplied was met.
A tank 12 for storing a cleaning liquid is provided in an electrostatic precipitator case 11 below the charging electrode 2A, and a cleaning mist generating blade 13 is provided in the tank 12. As shown in FIG. 4, the cleaning mist generating blade 13 can appropriately rotate the two blades 13 and 13 by a motor M via gears 14 and 15, and the cleaning mist generating blade 13 is shown in FIG. As described above, the cleaning liquid is disposed so as to be substantially half submerged in the liquid surface 16 of the tank 12, and by rotating, the mist of the cleaning liquid is generated and mixed into the contaminated air. Further, an air supply duct 17 for introducing a pollutant gas is arranged in the tank 12, and an exhaust duct 19 is arranged above the electrode member 1A via a baffle plate 18. Fan 19A is disposed. As the fan 19A, various types of fans such as a sirocco and a propeller can be used. Further, below the tank 12, a drain pipe 12A for taking out the cleaning liquid is connected.
[0012]
In the electrostatic precipitator case 11, a plurality of nozzles 30 capable of spraying a cleaning liquid toward the electrode member 1A are arranged in a vertical direction and around the electrode member. The arrangement of the nozzle 30 in the case 11 for the electrostatic precipitator is appropriately determined at the time of design so that the cleaning liquid is efficiently sprayed onto the electrode member 1A. The nozzle 30 is connected to a pump described later via a valve.
[0013]
A system constituted by using the above-mentioned electric precipitator 50 with a washing function will be described with reference to FIG.
In FIG. 5, reference numeral 50 denotes an electric precipitator, and a pump is connected to the tank 12 of the electric precipitator 50 via a filter 31 and a valve V. In this example, the electrostatic precipitator 50 is configured by arranging two rows of electrode members combined in a plurality of stages. However, it is also possible to arrange the electrode members 1A in one row or a plurality of rows as appropriate. The pump P is connected to the nozzle 30 of the electric precipitator 50 via a valve V. A cleaning liquid tank (alkali tank) 32 is connected to the pump P, and the cleaning liquid can be sucked from the cleaning liquid tank 32 and supplied to the nozzle 30. Further, the cleaning liquid stored in the lower part of the case can be sucked by the pump P via the valve V and circulated to the nozzle 30. When the cleaning liquid is circulated in this manner, it is possible to save the cleaning liquid. The valve V used in the system may be a valve suitable for the purpose of use (for example, various valves such as a normal valve for connecting / disconnecting a flow path, a three-way valve, a solenoid valve, a manual valve, etc.). Can be.
[0014]
As the cleaning liquid, strong alkaline electrolyzed water is used, and an electrolyzed water generator 33 for producing strongly alkaline electrolyzed water is appropriately disposed adjacent to the cleaning liquid tank 32. Although it is possible to use a caustic soda solution as the washing water, it is difficult to treat caustic soda because it must be neutralized at the time of drainage, and it is better not to use it if possible. For this reason, in this example, it is desirable to use strongly alkaline electrolyzed water (pH 12 or more) that does not require special treatment at the time of drainage generated by the electrolyzed water generation device as cleaning water. The alkaline tank is provided with a heater 34 for heating the cleaning liquid, a hydrogen removing section 35, and an overflow section 36. These can be appropriately provided as needed.
[0015]
The operation of the above system will be described.
Contaminated gas is sucked into the electric precipitator 50 by a fan (not shown). The sucked contaminant gas enters the electrode member 1A while being mixed with the mist generated by the rotation of the cleaning mist generating blade 13 disposed in the tank 12. In the electrode member 1A, the contaminant is charged by the charging electrode 2A and is adsorbed and collected by the dust collecting electrode 3A.
[0016]
On the other hand, by operating the pump P, the strongly alkaline electrolyzed water sucked from the cleaning liquid tank 32 is jetted toward the electrode member from the nozzle 30 arranged in the case of the electric precipitator. By this injection, the cleaning liquid flows down from the upper electrode to the lower electrode, and the electrodes are cleaned by the flow of the cleaning liquid. Since the gas containing the contaminants flows upward from below the electrostatic precipitator, the lower electrode is more contaminated than the upper electrode. Since the cleaning liquid is ejected from the plurality of nozzles 30 and the cleaning liquid flows downward from above, the amount of the cleaning liquid on the lower side becomes larger, whereby the cleaning ability of the lower electrode can be enhanced. Further, at the time of this cleaning, the odor in the contaminated gas can be deodorized by the action of the cleaning liquid and the electrode member.
[0017]
If necessary, the suction of the cleaning liquid from the cleaning liquid tank 32 is stopped, and the cleaning liquid stored below the electrostatic precipitator case of the electric precipitator 50 is circulated in the electric precipitator 50 using the pump P. You can also. By circulating the cleaning liquid in this way, the consumption of the cleaning liquid can be prevented.
The spray of the cleaning liquid may be performed continuously, but it is also possible to determine the time and perform the cleaning at appropriate intervals.
[0018]
Although the present invention has been described above, the configuration of the charging electrode and the dust collecting electrode is not limited to the above-described configuration, and any one of the currently used electrode structures can be used. A plurality of electric precipitators can be arranged in parallel to clean the electrodes of each electric precipitator. Further, the piping of the cleaning liquid, the arrangement of the nozzles, the number of nozzles, the type and number of valves arranged in the piping, and the like can be appropriately selected according to the system. Furthermore, the present invention may be embodied in various other forms without departing from the spirit or main characteristics of the present invention, so that the above-described embodiments are merely illustrative in all respects and are not to be construed as limiting. should not be done.
[0019]
【The invention's effect】
As described in detail above, according to the present invention, a plurality of sets of electric precipitators, each of which includes a charging electrode and a precipitating electrode, are arranged in series in a duct, and the power source is different for each set. Therefore, even if moisture is mixed in the contaminated air passing through the electrode, the contaminants can be reliably removed by any of the sets, and the air cleaning efficiency can be dramatically improved. And other excellent effects.
[Brief description of the drawings]
FIG. 1 is a sectional view of an electrode member of an electric precipitator used in the present invention.
FIG. 2 is a front sectional view of the electric precipitator with a cleaning function.
FIG. 3 is a side sectional view of the same.
FIG. 4 is a perspective view of a cleaning mist generating blade arranged in the electric dust collector with a cleaning function.
FIG. 5 is a configuration diagram of a dust collector using the above-mentioned electric dust collector.
FIG. 6 is a schematic diagram illustrating the configuration of an electric precipitator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1A Electric precipitator 2A Charging electrode part 3A Precipitating electrode part 2 High voltage electrode 3 Low voltage electrode 4 Power supply 5 Case 7 High voltage electrode 8 Low voltage electrode 9 Connection means 10 Electrode plate support insulator 11 Electric precipitator case 12 Tank 13 Cleaning mist generating blades 14, 15 Gear 16 Liquid level 17 Air supply duct 18 Baffle plate 19 Exhaust duct 30 Nozzle 31 Filter 32 Cleaning liquid tank 33 Electrolyzed water generator 34 Heater 35 Drain section 36 Overflow section 50 Dust 2G, 3G insulator

Claims (6)

An electrode member having a set of a charging electrode portion and a dust collection electrode portion is provided with at least one set of at least one pair of the electrode members in the case in a vertical direction, and a fan for flowing a contaminated gas upward from below the electrode member, An electrostatic precipitator with a cleaning function, wherein a plurality of nozzles for injecting cleaning water toward the electrode member are arranged inside the case accommodating the electrode member. 2. The electrostatic precipitator with a cleaning function according to claim 1, wherein the plurality of nozzles are vertically arranged inside the case, and the cleaning liquid ejected from the nozzles flows down naturally in each electrode part. 3. vessel. The electrostatic precipitator with a cleaning function according to claim 1 or 2, wherein the cleaning liquid is configured to be circulated and used. The electrostatic precipitator with a cleaning function according to any one of claims 1 to 3, wherein the cleaning liquid is strongly alkaline electrolyzed water. The cleaning liquid storage tank for storing a cleaning liquid is formed at a lower portion of the case, and a cleaning mist generating blade for converting the cleaning liquid into a mist is disposed in the tank. Electric dust collector with washing function. An electric precipitator with a cleaning function according to any one of claims 1 to 5, a duct for introducing a pollutant gas into the electric precipitator with cleaning, and a cleaning liquid in the electric precipitator with cleaning. A dust collector, comprising: a pump for supplying; and a cleaning liquid tank for supplying a cleaning liquid to the pump.

Images