JP2009119316A - Electric dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric dust collector which collects dust by impressing high voltage to parallel electrode plates, which can uniformly spray small amount of washing liquid used for washing the parallel electrode plates and filters installed before and after the parallel electrode plates and which can be automatically washed with periodicity and efficiency. <P>SOLUTION: The electric dust collector has motor-driven dampers 7, 8 as a sealing means and a detergent spraying part 4 is provided between the filters 5, 6 and an electric dust collecting unit part 3. Spraying on whole surfaces of the parallel electrode plates 2 and filters 5, 6 can be performed by spraying the washing liquid in a mist state from the detergent spraying part 4 and thereby washing can be surely carried out. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention, for example, in an electrostatic precipitator that collects oil mist or dust mixed with machine oil at a cutting work site, can wash each of the electrostatic precipitator and the filters installed at the front and rear with a mist-like cleaning liquid. The present invention relates to an electric dust collector with a cleaning function.

  Conventionally, as a method for cleaning the parallel electrode plates of the dust collecting unit in this type of electric dust collector, a method of cleaning the electrode plates by spraying cleaning water is known. (For example, refer to Patent Document 1).

  Hereinafter, the cleaning method for the conventional electrostatic precipitator will be described with reference to FIGS.

  FIG. 3 is a side view of a conventional parallel electrode plate cleaning system of an electrostatic precipitator. FIG. 4 is a front view of the parallel electrode plate cleaning system of the electric dust collector.

  As shown in FIG. 3, the electrostatic precipitator 100 has a structure in which the electrode plates 101 are stacked in parallel, and the entire surface of each of the electrode plates 101 is cleaned neatly by spraying air, cleaning solution 104 or the like. Cleaning by spraying water is common. A nozzle pipe 102 is provided on the electrode plate 101, and the cleaning liquid 104 and water are sprayed by the nozzle 103. The nozzle 103 has a conical spray area so that it can be sprayed over a wide range, but the spray pressure is reduced and the cleaning effect is lowered. Further, in order to increase the spray pressure, it is necessary to install a large number of nozzles 103, which increases the amount of the cleaning liquid 104 to be used and increases the cost.

  In addition, the conventional electrostatic precipitator is equipped with a filter to prevent foreign substances such as dust from entering the air that is sucked in. The cleaning method is to spray the surface of the filter by spraying water or cleaning liquid. It is known (see, for example, Patent Document 2).

However, in such a case, when spraying the cleaning agent, it is considered that if the spray is a small amount, it will not spread over the entire filter. It is necessary to use a chemical agent or to arrange a large number of nozzles so that the cleaning agent reliably hits the filter surface, which causes an increase in cost.
JP 2004-148296 A (FIGS. 1 and 2) Japanese Utility Model Laid-Open No. 5-18623 (FIGS. 1A and 1B)

  In such a conventional electrostatic precipitator cleaning method, the cleaning agent sprayed from the normal nozzle is sprayed toward the electrode plate, but since the spray from the nozzle is directional, it is on the opposite side as seen from the nozzle tip. Since a region where spraying is not performed directly occurs on the electrode plate positioned, the nozzles are arranged by overlapping the spray regions of the nozzles. For this reason, there is a problem that if the adjacent nozzles are sprayed at the same time, interference occurs, and the cleaning liquid cannot be successfully delivered. In addition, the method for cleaning dust accumulated in the filter has a problem that the filter has a coarse mesh and an oil mist and other dirt stuck to the filter cannot be washed sufficiently.

  Therefore, since there is a need for periodic maintenance if deposits remain due to the cleaning operation, establishment of a cleaning method that can automatically perform reliable cleaning is required.

  The present invention solves such a conventional problem by closing the front and rear of the electrostatic precipitator and the filter with a damper, and inserting a cleaning means between the electrostatic precipitator and the filter to spray the mist-like cleaning liquid. The cleaning operation is surely performed. By making the cleaning agent into a mist shape, the cleaning agent floats when sprayed, and the sealed space can be filled evenly. Therefore, the number of nozzles can be reduced, and the spray amount can be realized with a small amount. An object of the present invention is to provide an electrostatic precipitator intended to realize maintenance-free by automatically controlling these operations.

  In order to achieve the above object, an electrostatic precipitator of the present invention is an electrostatic precipitator that collects dust by charging dust in the air by charging parallel electrode plates, and an electrostatic precipitator unit provided with parallel electrode plates, First and second filters provided on the upstream side and downstream side of the electric dust collection unit, respectively, and first and second filters provided on the upstream side of the first filter and the downstream side of the second filter, respectively. Cleaning liquid for cleaning the electric dust collecting unit and the first and second filters between the closing means, the first filter and the electric dust collecting unit, and between the second filter and the electric dust collecting unit. A spraying section is provided, and during cleaning, the first and second closing means are closed to close the inside of the electric dust collector, and a mist-like cleaning liquid is sprayed from the cleaning liquid spraying section.

  Thereby, at the time of spraying the cleaning agent, the cleaning agent can be sprayed from the closing means to the electric dust collector and the filter at the same time so that the cleaning agent does not substantially leak. Further, the inside of the sealed space can be immersed with a small amount of cleaning liquid by spraying a mist-like cleaning liquid.

  Another means is that a drain plate-shaped bottom plate is provided below the first and second closing means, a drain port is provided in the bottom plate, and the cleaning liquid is reused in the drain port. The return pipe and the discharge pipe for discarding the cleaning liquid are connected, and switching means for switching the drainage path from the drain port between the return pipe and the discharge pipe is provided.

  Thereby, the cleaning liquid discharged from the electric dust collector can be reused, and when it is finally discarded, the cleaning liquid can be discarded in the discharge pipe.

  The other means is provided with a recovery means for regenerating and recovering the cleaning liquid in the return pipe.

  Thereby, the cleaning liquid discharged from the electric dust collector and the collected dirt can be separated, and the cleaning liquid can be reused.

  In addition, the other means is provided with discharge means for discharging the air inside the electric dust collector surrounded by the first and second closing means and the bottom plate from the outline of the electric dust collector.

  Thereby, when the cleaning agent leaks from the sealed space, the internal air can be discharged into the limited space by the discharging means.

  The other means has a structure in which the bottom portion of the first and second filters and the first and second closing means is inclined toward the bottom plate side.

  Thereby, it is possible to prevent the cleaning liquid from accumulating at the bottom of the filter and the closing means.

  Further, the other means is provided with a hinge on one side of the first and second filters so that it can be opened and closed.

  Thereby, a washing part and an electric dust collector can be checked easily.

  Further, as another means, the cleaning liquid spraying section includes a moving means capable of moving in a plane parallel to the filter plane.

  Thereby, the number of cleaning liquid spraying portions can be minimized, and the pipe diameter to the cleaning liquid spraying portion can be reduced.

  The other means includes a chain drive, a gear, an air cylinder, or the like as a moving means capable of plane movement.

  Accordingly, the cleaning liquid spraying unit can be moved in a plane by remote operation and automatic operation during spraying the cleaning liquid.

  As another means, the sealing means of the electric dust collector is a damper or shutter using electric power, pneumatic pressure or hydraulic pressure.

  Thereby, the electric dust collecting part can be sealed by remote operation and automatic operation when spraying the cleaning liquid.

  Another means uses at least a surfactant, a solvent-based cleaning agent, or alkaline electrolyzed water in the cleaning liquid.

  As a result, even with sticky substances, for example, sticky substances such as oil mist, the dust collection substance can be effectively decomposed by the mist spray and separated from the electrode plate by mist spraying. Can be reduced.

  The other means uses a valve or electromagnetic valve equipped with a pneumatic actuator or an electric actuator as a switching means for nozzle piping that becomes a supply path of the cleaning liquid to the cleaning liquid spraying section.

  Thereby, the electric dust collecting part can be sealed by remote operation and automatic operation when spraying the cleaning liquid.

  According to the present invention, it is possible to efficiently immerse a parallel electrode plate and a filter of an electrostatic precipitator without using a large amount of cleaning agent necessary for cleaning at once, and against leakage from a sealed space. It can be minimized by exhausting. Moreover, it can wash | clean efficiently by the period of automatic driving | operation, or the cleaning time judgment by a sensor etc. Further, by carrying out the cleaning periodically, it becomes maintenance-free, and an effect of reducing maintenance costs can be obtained.

(Embodiment 1)
FIG. 1 is a schematic view of a side cross section of an electrostatic precipitator 1 shown in Embodiment 1 of the present invention.

  As shown in FIG. 1, the electrostatic precipitator 1 is an electric device composed of a plurality of parallel electrode plates 2 to which air containing dirt is blown in the direction of the arrow in FIG. The dust collection unit 3 collects dirt contained in the air. A cleaning agent spraying portion 4 is disposed on the front and rear surfaces. Filters 5 and 6 are installed on the front surface of the front-side cleaning agent spraying portion 4a and the rear surface of the rear-side cleaning agent spraying portion 4b. Further, for example, electric dampers 7 and 8 are provided as closing means on the outside thereof. Note that the damper may be driven using air pressure or hydraulic pressure. A shutter or a take-up cover may be used instead of the electric damper. In addition, a drain plate 9 for receiving a surplus of the cleaning agent sprayed from the cleaning agent spraying unit 4 and a discharge pipe 10 for flowing the surplus cleaning agent are installed at the lower part of the electrostatic precipitator 1. In addition, an exhaust pipe 11 for discharging the air inside the electric dust collector 1 is installed in a part of the electric dust collector 1.

  With the above configuration, the operation of the present embodiment will be described. When air containing dust, oil mist or the like is purified by the electric dust collector 1, dirt components adhere to the parallel electrode plate 2. When the dirt in the air adheres to the parallel electrode plate 2 and the dust collection efficiency deteriorates, or when the dirt is attached to the filters 5 and 6 and clogging occurs, the pressure loss increases, and Since the dust collection efficiency is lowered, the parallel electrode plate 2 and the filters 5 and 6 are sprayed with the cleaning agent periodically.

  When spraying the cleaning liquid, first, the electric dust collector 1 is closed by closing the electric dampers 7 and 8. Thereafter, a mist-like cleaning liquid is sprayed from the cleaning agent spraying section 4 to separate the dust collecting substances adhering to the parallel electrode plate 2 and the filters 5 and 6. The spray of the cleaning liquid is stored in the cleaning liquid tank 12. For example, the cleaning liquid can be sprayed in a mist form from the cleaning agent spray unit 4 by supplying the cleaning liquid from the cleaning liquid tank 12 by supplying air with a compressor. Since the mist-like cleaning liquid has a light mass, it drifts and fills in the closed space, and the cleaning liquid adheres to the narrow parallel electrode plate 2 and the filters 5 and 6 away from the cleaning liquid spraying portion. Moreover, convection is generated in the closed space by the sprayed mist-like cleaning liquid, and the mist can be uniformly attached to the parallel electrode plate 2 and the filter uniformly.

  The presence or absence of spraying can be carried out by automatically opening and closing by installing, for example, an electromagnetic valve 13 as an opening and closing means in a path for supplying air to the cleaning liquid tank 12. Moreover, since an arbitrary pressure can be set by installing the regulator 14 in front of the electromagnetic valve 13, the amount of spraying can be adjusted.

  Further, the cleaning liquid that has been sprayed and dropped by gravity without adhering to the parallel electrode plate 2 and the filters 5 and 6 passes through the discharge pipe 10 by the electric dampers 7 and 8 and the inclined bottom plate and drain plate 9 of the filters 5 and 6. It is possible to return to the drainage or cleaning liquid tank 12. At this time, when draining, for example, the drainage electric ball valve 15 installed in the drain side path is opened, and the regeneration electric ball valve 16 installed in the cleaning tank side path is closed, for example. It becomes possible to drain the water. The electric ball valve is a ball valve that is opened and closed by an electric actuator. A ball valve using a pneumatic actuator or an electromagnetic valve may be used instead of the electric actuator. On the other hand, when returning to the cleaning liquid tank 12, the cleaning liquid can be reused by closing the drainage electric ball valve 15 and opening the regeneration electric ball valve 16. Further, for example, a cleaning liquid regeneration filter 17 for regenerating the cleaning agent is installed in the piping path to the cleaning liquid tank 12, and can be reused by returning to the cleaning liquid tank 12.

  In the present invention, the cleaning liquid used can be water or a surfactant, a solvent-based cleaning agent, or an alkaline cleaning agent. If it is a liquid washing | cleaning liquid, it can be made into mist form by the cleaning agent spraying part 4, and it can spread over the whole even if it is any washing | cleaning liquid. In particular, sticky dirt such as oil mist can be peeled off from the adhered surface by using a surfactant, a solvent-based detergent, or an alkaline cleaner.

  In addition, depending on the cleaning agent used, it is considered that the human body, production facilities, and processed products are significantly affected. In the present invention, since the mist-like cleaning liquid is sprayed on the space closed by the electric dust collecting unit 3 and the electric dampers 7 and 8, the volume in the closed space increases and mist leaks from the gap in the closed space. The pressure inside the electrostatic precipitator 1 is installed, for example, by a pressure gauge, and when the value becomes a positive pressure, the air inside the electric precipitator 1 is made to escape using, for example, a fan. Thereby, it can wash | clean, without affecting the human body outside a machine or an installation thing with a washing | cleaning agent.

  Moreover, the filter 5 and 6 can be opened and closed by connecting one side of the filter 5 and 6 and the surface of the electrostatic precipitator 1 with a hinge. As a result, the cleaning agent spraying portion 4 is exposed, so that maintenance when the cleaning agent spraying portion 4 is clogged can be easily performed. Moreover, since the electric dust collection unit 3 is exposed by opening and closing the filters 5 and 6, when the electric dust collection unit 3 breaks down, it can be easily taken out from the electric dust collector 1.

  Further, as shown in FIG. 2, the cleaning agent spraying unit 4 can be translated by attaching a pipe for installing the cleaning agent spraying unit 4 to the chain 23 and rotating the sprocket 22 by the drive motor 20. Note that the translation may be performed by a gear or an air cylinder instead of the chain drive. This makes it possible to reduce the number of cleaning agent spraying parts 4 used when spraying the cleaning agent, not only reduce the pipe diameter of the entire pipe, but also electrically connect the pipes where the cleaning agent spraying part 4 is installed. By stopping away from the ventilation path leading to the dust collection unit 3, uniform air can be sent to the parallel electrode plate 2, and the ability of the electrostatic dust collection unit 3 can be stabilized. In addition, the mist-like cleaning liquid can be sprayed evenly on the parallel electrode plate 2 and the filters 5 and 6 of the electrostatic dust collecting unit 3 and the amount of cleaning agent used can be reduced, resulting in maintenance costs. Can be reduced.

  A device that automatically cleans the electrode plate is installed in an electrostatic precipitator that collects dust by applying high voltage to the parallel electrode plate, and the periodic cleaning operation is performed to save maintenance and reduce costs. is there. Since it can cope with sticky dust collecting substances, it can be used not only for dust and dirt, but also for oil mist and dust treatment in incineration facilities, and cleaning of oil stains such as kitchens of restaurants such as canteens.

Schematic of the side cross section of the electric dust collector 1 of Embodiment 1 of this invention Schematic diagram of moving means for cleaning agent spray of electric dust collector 1 according to Embodiment 1 of the present invention The figure which shows the structure of the washing | cleaning system of the parallel electrode plate of the conventional electrostatic precipitator The figure which shows the structure of the washing | cleaning system by the wiper of the parallel electrode plate of the conventional electrostatic precipitator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric dust collector 2 Parallel electrode plate 2-1 Charge part parallel electrode plate 2-2 Dust collection part parallel electrode plate 3 Electric dust collection unit part 4 Cleaning agent spray part 5 Filter 6 Filter 7 Electric damper 8 Electric damper 9 Drain plate 10 Discharge Pipe 11 Exhaust pipe 12 Cleaning liquid tank 13 Solenoid valve 14 Regulator 15 Electric ball valve for drainage 16 Electric ball valve for regeneration 17 Cleaning liquid regeneration filter

Claims (11)

In the electrostatic precipitator that charges the parallel electrode plate and collects dust in the air to collect the dust, the electrostatic precipitator provided with the parallel electrode plate and the upstream and downstream sides of the electrostatic precipitator 1, the second filter, the first and second closing means provided on the upstream side of the first filter and the downstream side of the second filter, respectively, between the first filter and the electrostatic precipitator, In addition, an electrostatic precipitator and a cleaning liquid sprayer for cleaning the first and second filters are provided between the second filter and the electrostatic precipitator, and the first and second closing means are closed during cleaning. Then, the inside of the electrostatic precipitator is closed, and a mist-like cleaning liquid is sprayed from the cleaning liquid spraying section. A drain plate-shaped bottom plate is provided between the first and second closing means, and a drain port is provided in the bottom plate. The drain port is provided with a return pipe for reusing the cleaning solution, and the cleaning solution is discarded. The electric dust collector of Claim 1 provided with the switching means which connects the piping for discharge to perform, and switches the drainage path from a drain outlet by return piping and piping for discharge. The electrostatic precipitator according to claim 2, wherein the return pipe is provided with a recovery means for regenerating and recovering the cleaning liquid. The electric dust collector according to claim 1, further comprising discharge means for discharging air inside the electric dust collector surrounded by the first and second closing means and the bottom plate, from an outline of the electric dust collector. The electrostatic precipitator according to claim 1, wherein the first and second filters and the first and second closing means are structured such that the shape of the bottom is inclined toward the bottom plate. 6. The electrostatic precipitator according to claim 1, wherein a hinge is provided on one side of the first and second filters so that the filter can be opened and closed. The electrostatic precipitator according to claim 1, wherein the cleaning liquid spraying unit includes a moving unit that can move in parallel with a filter plane. The electric dust collector according to claim 7, further comprising a chain drive, a gear, an air cylinder, or the like as the moving means capable of moving in a plane. The electric dust collector according to claim 1, wherein the sealing means of the electric dust collector is a damper or a shutter using electric power, pneumatic pressure or hydraulic pressure. The electrostatic precipitator according to claim 1, wherein water, a surfactant, a solvent-based cleaning agent, or alkaline electrolyzed water is used as the cleaning liquid. A valve equipped with a pneumatic actuator or an electric actuator as a switching means for switching a nozzle pipe serving as a cleaning liquid supply path to the cleaning liquid spraying section, and a switching means for switching the drainage path from the drain port between a return pipe and a discharge pipe, or The electric dust collector according to claim 1, wherein a solenoid valve is used.

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