JP2003088777A - Electrostatic precipitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce a loss of a gas pressure by a simple structure and to thereby reduce a production cost. SOLUTION: A carriage means 20 retracts the first and the second washing nozzles 17 and 18 to a position outside a precipitator body 16 when the precipitator body 16 is not washed, and transfers them to a position facing to the body 16 when the body 16 is washed. In this way, the number of washing nozzles can be decreased because washing nozzles need not be fixedly formed in a position facing to the body 16. Because a damper for preventing the washing fluid from scattering can be dispensed with, the loss of the pressure of a gas can be decreased. Further, the reduction in the number of components such as washing nozzles and a damper can realize a reduced production cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic precipitator which is provided in a ventilation tunnel of a road tunnel, a ventilation center or the like and removes fine particles contained in the gas when the gas in the tunnel is ventilated.

[0002]

Air in a road tunnel is an indicator of how it looks in a road tunnel from the viewpoint of safety and environmental health.
Visibility Index (VI) value and carbon monoxide (CO)
It is said that the concentration must be kept below a certain value. Therefore, a ventilation tunnel and a ventilation station are provided in a long road tunnel so that the air in the road tunnel is exhausted and the outside air is introduced into the road tunnel. Since the air in the road tunnel contains a lot of dust caused by, for example, exhaust gas of automobiles, it is necessary to remove the dust when exhausting the air in the road tunnel.

As a means for removing dust contained in the air in a road tunnel, a dust filter is installed in the gas flow passage, and the dust is removed by letting the gas pass through the dust filter. The dust removing filter is inexpensive and therefore is frequently used, but has the following problems. That is, the dust removal filter uses particulate matter (PM: Pa) that is relatively large dust.
rticle matter can be removed, but small suspended particulate matter (SP) with a diameter of 10 μm or less
M: Suspended Particle Matter) cannot be removed. Since SPM is often contained in the exhaust gas of automobiles equipped with a diesel engine and the like, and a sanitary problem is pointed out, it is not preferable to exhaust the air in the road tunnel including the SPM to the outside of the road tunnel as it is.

An electrostatic precipitator is an effective means for removing SPM contained in gas. The electrostatic precipitator collects dust charged by corona discharge by electrostatic force. That is, a high voltage is applied to the electrodes of the electrostatic precipitator to generate corona discharge, and the dust is charged when the gas containing the dust flows between the electrodes. The charged dust is adsorbed and collected by an electrode provided on the downstream side in the gas flow direction with respect to the electrode that generates the corona discharge, by electrostatic force. If the operation of the electrostatic precipitator is continued for a long time while leaving the PM and SPM adsorbed on the electrodes, the dust collecting capability will decrease, so an electrostatic precipitator equipped with a cleaning function for cleaning the PM and SPM adsorbed on the electrodes will also be used. It has been used.

[0005]

The electrostatic precipitator has an SP
Since it is possible to remove M also from dust and has an excellent dust removing capability, it is desirable to install it in many road tunnels. However, the electrostatic precipitator having a cleaning function as described above is a large-scale facility, and a large installation space is required in the ventilation tunnel and the ventilation station in order to install the electrostatic precipitator.

In a newly designed road tunnel,
A large electrostatic precipitator can be installed by preparing sufficient installation space in the ventilation tunnel and ventilation area from the design stage. However, few conventional road tunnels have sufficient space to install large electrostatic precipitators in ventilation tunnels and ventilation stations. Although it is desirable to install an electric dust collector with excellent dust removal capability in old road tunnels, many old road tunnels have a small installation space. It is difficult to install a dust collector.

In order to solve such a problem, the dust collecting capability of the electrostatic precipitator, that is, the amount of treated air per unit time is increased, and the size of the treated electricity is equal to or higher than the conventional one. Dust devices are being developed. For example, the passing wind speed of the electrostatic precipitator is 7 m / m in most conventional devices.
However, it has been increased to 9 m / sec, and a device having an increased passing wind speed has been realized. Although the processing volume of the electrostatic precipitator increases as the passing air velocity increases, downsizing is realized, but the pressure loss of gas on the outlet side to the inlet side of the electrostatic precipitator increases.

FIG. 10 is a diagram showing a simplified structure of the dust collecting unit 1 and the cleaning nozzle 2 provided in the conventional electric dust collector. On the gas outlet side of the dust collecting unit 1 provided in the conventional electric dust collector, a plurality of cleaning nozzles 2 are always arranged in a direction facing the dust collecting unit 1 and traversing the dust collecting unit 1. Therefore, the gas flowing through the dust collecting unit 1 from the upstream side to the downstream side of the gas flow passage indicated by the arrow 3 hits the plurality of cleaning nozzles 2 and the pipe 4 for supplying the cleaning liquid to the cleaning nozzles 2, resulting in a pressure loss. Occurs. In addition, when cleaning the dust collecting unit 1, a damper or the like provided to prevent scattering of the cleaning liquid also causes pressure loss.

In order to compensate for the pressure loss, the power for driving the exhaust fan must be increased, so that a large-capacity electric motor that consumes a large amount of electric power is required to drive the exhaust fan. Therefore, in order to increase the passing wind speed of the electrostatic precipitator and reduce the size, there is a problem that the manufacturing cost increases.

An object of the present invention is to provide an electrostatic precipitator capable of reducing the pressure loss of gas with a simple structure and reducing the manufacturing cost.

[0011]

DISCLOSURE OF THE INVENTION The present invention relates to an electrostatic precipitator which is installed in a gas flow passage and removes fine particles contained in a gas. The gas containing fine particles flowing between electrodes to which a voltage is applied. A plurality of dust collecting units for removing fine particles from the dust collecting unit are arranged in a direction crossing the gas flow passage, and the dust collecting units are provided on the upstream side and the downstream side of the gas flow passage with respect to the dust collecting unit main body, respectively. And a cleaning nozzle for injecting the cleaning liquid toward the main body of the dust collector, a cleaning liquid supplying means for supplying the cleaning liquid to the cleaning nozzle, and a conveying means for conveying the cleaning nozzle in a direction orthogonal to the gas flow direction. The electric dust collector is characterized in that

According to the present invention, since the cleaning nozzle can be conveyed in the direction orthogonal to the gas flow direction by the conveying means, the cleaning nozzle is conveyed to a position facing the dust collecting unit to be cleaned only at the time of cleaning. During non-cleaning, the cleaning nozzle can be retracted from the dust collector main body to a position where it does not hinder the flow of gas. Further, since it is not necessary to always provide the cleaning nozzle at the position facing the dust collector main body, and the cleaning nozzle can be conveyed to the position facing the dust collecting unit to be cleaned only during cleaning, the number of cleaning nozzles can be reduced. it can. As a result, it is possible to reduce the pressure loss of gas that has been conventionally generated due to the permanently installed cleaning nozzle.

Further, the cleaning nozzles respectively provided on the upstream side and the downstream side of the gas flow passage are conveyed to opposite positions, and the cleaning liquid is jetted simultaneously from the respective cleaning nozzles.
Since the spraying cleaning liquid produces a shielding effect, the scattering of the cleaning liquid can be reduced. Therefore, it is possible to omit the damper that is conventionally provided to prevent the scattering of the cleaning liquid during cleaning. By omitting the damper, it is possible to prevent the pressure loss that has been conventionally caused by installing the damper. Also, by omitting the damper, the natural ventilation force based on the pressure difference between the exit and the entrance of the road tunnel and the traffic ventilation force, which is the ventilation force due to the wind generated by the passage of cars, are always effective for ventilation in the road tunnel. Can be utilized.

As described above, the number of cleaning nozzles is reduced and the number of parts is reduced by omitting the damper, which simplifies the construction, and the reduction in pressure loss suppresses the increase in the capacity of the exhaust fan power. The cost can be reduced.

Further, according to the present invention, a plurality of the cleaning nozzles are arranged in a straight line in a lateral direction of the dust collector main body, and a plurality of the cleaning nozzles are arranged in a straight line in a horizontal direction of the dust collector main body, and the cleaning means moves the dust collector main body downward from above. The cleaning liquid is sprayed while being conveyed to clean the main body of the dust collector.

According to the present invention, the cleaning nozzle cleans the main body of the dust collector while moving downward from the upper side of the main body of the dust collector, and the waste water generated by cleaning the main body of the dust collector has been cleaned. Since it flows from the dust collection unit to the uncleaned dust collection unit, the cleaned dust collection unit is not contaminated.

Further, according to the present invention, in an electrostatic precipitator installed in a gas flow passage for removing fine particles contained in a gas, fine particles are removed from a gas containing fine particles flowing between electrodes to which a voltage is applied. A plurality of dust collecting units, which are arranged in a direction crossing the gas flow passage,
A width substantially equal to the width and height of the portion to be cleaned of the dust collecting unit that is provided on the upstream side and the downstream side of the gas flow passage with respect to the dust collecting apparatus main body and is a part of the dust collecting apparatus main body. A shield plate having a height, a cleaning nozzle provided on the surface of the shield plate facing the main body of the dust collecting device, for injecting a cleaning liquid toward the main body of the dust collecting device, a cleaning liquid supply means for supplying the cleaning liquid to the cleaning nozzle, and a shield An electrostatic precipitator comprising: a transporting unit that transports the plate in a direction orthogonal to the gas flow direction.

According to the present invention, since the shielding plate having the cleaning nozzle can be conveyed in the direction orthogonal to the gas flow direction by the conveying means, the shielding plate faces the dust collecting unit to be cleaned only when cleaning the shielding plate. It is possible to convey the shielding plate to the position where it is not washed and to retreat to a position where it does not interfere with the flow of gas when it comes off the dust collector main body. Further, since it is not necessary to always provide the cleaning nozzle at the position facing the dust collector main body, and the shielding plate having the cleaning nozzle can be transported to the position facing the dust collecting unit to be cleaned only at the time of cleaning, the number of cleaning nozzles can be reduced. Can be reduced. As a result, it is possible to reduce the pressure loss of gas that has been conventionally generated due to the permanently installed cleaning nozzle.

Further, when the shielding plates provided on the upstream side and the downstream side of the gas flow passage are conveyed to opposite positions and the cleaning liquid is jetted from the cleaning nozzles provided on the respective shielding plates, the scattering of the cleaning liquid is reduced by the shielding plate. can do. Therefore, it is possible to omit the damper that is conventionally provided to prevent the scattering of the cleaning liquid during cleaning. By omitting the damper, it is possible to prevent the pressure loss that has been conventionally caused by installing the damper.

As described above, the number of washing nozzles is reduced and the number of parts is reduced by omitting the damper, which simplifies the construction, and the reduction in pressure loss suppresses an increase in the capacity of the exhaust fan power. The cost can be reduced.

According to the present invention, the width of the shielding plate is substantially equal to the width of a plurality of dust collecting units to be cleaned, and the height of the shielding plate is substantially equal to the height of the unit dust collecting unit. The cleaning liquid is sprayed from a cleaning nozzle provided on the shielding plate while the shielding plate is conveyed from above to below by the means to clean the dust collecting device main body.

According to the present invention, the shielding plate having the cleaning nozzle cleans the main body of the dust collector while moving downward from the upper direction of the main body of the dust collector, and is generated by cleaning the main body of the dust collector. Since the dirty water flows from the cleaned dust collecting unit toward the unwashed dust collecting unit, the cleaned dust collecting unit is not contaminated.

Further, the invention is characterized in that the shielding plate is provided with a shielding member rising from an edge of the shielding plate.

According to the present invention, since the shielding plate is provided with the shielding member rising from the edge of the shielding plate, the cleaning liquid sprayed from the cleaning nozzle can be more efficiently prevented from being scattered around.

Further, the present invention is characterized in that the shielding plate is housed so as to be parallel to the direction in which the gas flows in the gas flow passage when the cleaning is not performed.

According to the present invention, since the state where the shielding plate is housed is parallel to the gas flow direction, it is possible to reduce the pressure loss of the gas flowing through the gas flow passage, and also in the gas flow passage. The storage space for the shield plate can be reduced.

Further, the present invention is characterized in that the cleaning liquid is water or warm water. According to the present invention, since the cleaning liquid is inexpensive water or warm water, the running cost can be kept low. Further, by using warm water as the cleaning liquid, it is possible to reliably clean and remove the dust containing the oil adsorbed on the electrode of the main body of the dust collector. As a result, the number of times the dust collector body is cleaned can be reduced, the operating rate of the equipment can be improved, and the spark discharge that occurs between the electrodes of the dust collector body is suppressed to prevent the dust collection efficiency from decreasing. can do.

Further, according to the present invention, the dust collection device main body is provided on the upstream side and the downstream side of the gas flow passage in a plane including the cleaning nozzle in parallel with the cleaning nozzle so as to face the dust collection device body. An air nozzle for injecting air, and an air nozzle air supply means for supplying air to the air nozzle are further included.

According to the present invention, since the air can be jetted from the air nozzle in parallel with the washing liquid jetted from the washing nozzle, an air curtain is formed on the side of the jetted washing liquid. This can prevent the cleaning liquid from splashing to the surroundings. Moreover, since the jet pressure of air is added to the jet pressure of the cleaning liquid, the effect of washing the dust collecting unit is increased. Further, after the injection of the cleaning liquid is stopped, the injection of air is continued for a while to drain the cleaned dust collecting unit, so that the drying time can be shortened.

Further, according to the present invention, an air supply means for supplying air to the cleaning nozzle, and a supply path provided between the cleaning liquid supply means and the air supply means and the cleaning nozzle and provided in the cleaning liquid supply means and the air supply means. By switching
It is characterized by further including switching means for switching between the cleaning liquid supplied to the cleaning nozzle and the air.

According to the present invention, the cleaning liquid supplied to the cleaning nozzle and the air can be switched. Therefore, after the cleaning liquid is sprayed from the cleaning nozzle to clean the dust collector main body, air is sprayed from the cleaning nozzle. Draining and drying of the dust collector main body can be performed to improve the cleanliness of the electrode surface of the dust collector main body.

Further, the present invention is characterized in that an air heater for heating air is provided in at least one of the air nozzle air supply means and the air supply means.

According to the present invention, since at least one of the air supply means for the air nozzle and the air supply means is provided with the air heater for heating the air, the cleaning liquid is jetted from the cleaning nozzle to clean the main body of the dust collector. After cleaning, hot air, which is heated air, can be jetted from the air nozzle or the cleaning nozzle to drain and dry the dust collector main body. As a result, the drying time after cleaning the dust collector main body can be further shortened and the total time required for cleaning and drying the dust collector main body can be shortened, so that the operation rate of the device can be improved.

Further, the present invention provides a protective wire net, which is provided on one or both of the upstream side and the downstream side of the gas flow passage with respect to the main body of the dust collection device so as to cross the gas flow passage and protects the main body of the dust collection device. And a frame constituting a dust collector main body and a protective wire net, wherein the protective wire net and the frame are provided with an openable / closable door structure.

According to the present invention, a protective wire net for protecting the dust collector main body is provided across the gas flow passage on either or both of the upstream side and the downstream side of the gas flow passage with respect to the dust collector main body. It is provided. This makes it possible to remove the protective wire net only because it is provided as an integrated protective wire net that covers the main body of the dust collecting device, unlike the protective wire net that is conventionally fixed and provided for each dust collection unit. In case of damage or clogging, it is easy to repair, maintain, clean and replace the protective wire mesh. Further, since it is possible to omit the frame for fixing the protective wire net to each dust collecting unit as in the conventional case, it is possible to realize a low pressure loss of gas. Further, since the door structure is provided in the protective wire net and the frame forming the protective wire net, an operator can easily enter and exit when performing maintenance and inspection of the dust collector main body.

Further, the present invention is characterized in that the door structure provided on the protective wire net and the frame is configured to open toward the upstream side of the gas flow passage.

According to the present invention, since the door structure provided on the protective wire net and the frame is configured to open toward the upstream side of the gas flow passage, the wind pressure when the gas flows through the gas flow passage. This prevents the door structure from opening undesirably.

The door structure provided on the protective wire net and the frame is in a state in which the operation of the electrostatic precipitator is stopped and the door is closed in a state in which the door structure is opened in order to prevent an electric shock from an operator. A safety switch is provided to enable operation of the electrostatic precipitator. Since the door structure is configured to open toward the upstream side of the gas flow passage, undesired opening of the door structure is prevented, so that the operation of the electrostatic precipitator is prevented from unnecessarily stopping. The operating rate can be improved.

In addition, the present invention provides the electrostatic precipitator according to any one of the above, and when a fire occurs in the gas flow passage, a cleaning nozzle or a shield plate provided with the cleaning nozzle is provided in the gas flow direction by the conveying means. An electrostatic precipitator characterized in that the precipitator body is cooled by being conveyed in a direction orthogonal to the cleaning nozzle and sprayed with a cleaning liquid toward the precipitator body to prevent damage to the precipitator body. This is the operation method.

According to the invention, during a fire,
The cleaning liquid is jetted from the cleaning nozzle toward the dust collector main body while the cleaning nozzle or the shielding plate having the cleaning nozzle is transported in the direction orthogonal to the gas flow direction by the transport means, so that the dust collector main body can be cooled. . As a result, the dust collector main body can be protected from the radiation heat due to the flame or the heat contained in the fire smoke, and the heat damage to the dust collector main body can be prevented.

Further, according to the present invention, the electric dust collector according to any one of the above is prepared, and when the operation of the dust collecting unit is stopped, the shielding plate is conveyed to a position facing the dust collecting unit whose operation is stopped by the conveying means. The shielding plate shields the dust collection unit that has stopped operating at the upstream side and the downstream side of the gas flow passage to prevent gas from flowing through the dust collection unit that has stopped operating, and prevents the dust collection efficiency from decreasing. The method for operating an electrostatic precipitator is characterized by the following.

According to the present invention, the shielding plate can be conveyed to a position facing the dust collecting unit whose operation has stopped, and the flow of gas to the dust collecting unit whose operation has stopped can be prevented by the shielding plate. As a result, only the gas flow to the dust collection unit that has stopped operating is efficiently blocked by the shield plate, and the gas that has been blocked from flowing to the dust collection unit that has stopped operating does not Since dust is removed by passing through the dust collecting unit adjacent to the unit, it is possible to prevent the dust collecting efficiency from decreasing.

According to the present invention, the electric dust collector according to any one of the above is prepared, the cleaning liquid is sprayed from the cleaning nozzle toward the dust collecting unit to be cleaned, and after the cleaning liquid is sprayed by the cleaning nozzle, The cleaning liquid supplied to the cleaning nozzle is switched to air by the switching means, the air is jetted from the cleaning nozzle toward the dust collecting unit, the cleaning nozzle and the dust collecting unit are drained and dried, and the air from the cleaning nozzle is removed. After the injection is completed, the cleaning nozzle is conveyed to a position facing the next dust collecting unit to be cleaned based on a predetermined order by the conveying means, and the air supplied to the cleaning nozzle is switched to the cleaning liquid by the switching means. A method for cleaning an electrostatic precipitator, characterized in that the main body of the precipitator is cleaned.

According to the present invention, for each dust collecting unit to be cleaned, the cleaning liquid is sprayed from the cleaning nozzle for cleaning, and after cleaning, air is sprayed from the cleaning nozzle to drain the cleaning nozzle and the dust collecting unit. Since the drying is performed, the dust collector main body, which is an aggregate of the dust collecting units, can be sufficiently and reliably dried within a limited cleaning time.

According to the present invention, the electric dust collector according to any one of the above is prepared, the cleaning liquid is sprayed from the cleaning nozzle toward the dust collecting unit to be cleaned, and after the cleaning liquid is sprayed by the cleaning nozzle, The conveying unit conveys the cleaning nozzle to a position facing the next dust collecting unit to be cleaned based on a predetermined order, and the dust collecting unit facing the cleaning nozzle after the transfer is the last cleaning based on the predetermined order. When it is a dust collection unit, the cleaning liquid is sprayed from the cleaning nozzle toward the dust collection unit, and after the cleaning liquid has been sprayed by the cleaning nozzle, the cleaning liquid supplied to the cleaning nozzle is switched to air by the switching means. , The air is sprayed from the cleaning nozzle toward the dust collecting unit, and the cleaning nozzle and the dust collecting unit are drained and dried to clean the main body of the dust collecting device. A method for cleaning an electrostatic precipitator to.

According to the present invention, the dust collecting units other than the last dust collecting unit to be cleaned based on the predetermined order are only washed by injecting the cleaning liquid from the cleaning nozzle, and the dust collecting unit is predetermined. Only for the last dust collecting unit to be washed based on the order, the washing liquid is jetted from the washing nozzle to be washed, and then air is jetted from the washing nozzle to drain and dry the washing nozzle and the dust collecting unit. As a result, the total time required for cleaning and drying the dust collector main body can be shortened, and the operating rate of the device can be improved. Also, since the air is sprayed from the cleaning nozzle only to the last dust collecting unit to be cleaned, the amount of air used to be sprayed from the cleaning nozzle should be reduced during the cleaning and drying operations of the main body of the dust collector. You can By reducing the amount of air used, the capacity of the air supply means for the cleaning nozzle is reduced,
It becomes possible to reduce power consumption.

[0047]

1 is a perspective view showing a simplified configuration of an electric dust collector 10 according to an embodiment of the present invention, and FIG. 2 shows the essential parts of the electric dust collector 10 shown in FIG. It is a front view which simplifies and shows the structure of a part, and FIG. 3 is a perspective view which simplifies and shows the whole structure of the road tunnel 13 provided with the ventilation center 11 or the ventilation tunnel 12 in which the electric dust collector 10 shown in FIG. 1 is installed. It is a figure.

The electrostatic precipitator 10 installed in the gas flow passage 14 formed in the ventilator 11 of the road tunnel 13 is a device for removing fine particles contained in the gas, and a voltage is applied thereto. With respect to the dust collector main body 16 in which a plurality of dust collectors 15 for removing fine particles from a gas containing fine particles flowing between the electrodes are arranged in a direction crossing the gas flow passage 14, Gas flow passage 14
Of the first and second cleaning nozzles 17, 18 that are respectively provided on the upstream side and the downstream side of the nozzle and inject the cleaning liquid toward the dust collector main body 16, and the first and second cleaning nozzles 17, 18
A cleaning liquid supply means 19 for supplying a cleaning liquid to the first and second cleaning nozzles 17, a transfer means 20 for transferring the first and second cleaning nozzles 17 and 18 in a direction orthogonal to the gas flow direction, and a dust collector main body 1
6, a protective wire net 21 that is provided on the upstream side and the downstream side of the gas flow path 14 so as to cross the gas flow path 14 and protects the dust collector main body 16, and a frame 22 that constitutes the protective wire net 21.

The dust collecting unit 15 is provided with electrodes for generating a corona discharge when a high voltage is applied, and charges fine particles contained in the gas flowing between the electrodes in the gas flow direction indicated by the arrow 23, The charged fine particles (hereinafter referred to as dust) are adsorbed and collected by another electrode provided downstream of the corona discharge generating electrode in the gas flow direction by electrostatic force. As the operating time of the electrostatic precipitator 10 elapses,
Since dust is adsorbed and accumulated on the other electrode provided in the dust collection unit 15 to reduce the dust collection efficiency, the adsorption ability of the electrode is restored by cleaning, that is, the dust collection unit 15
The dust collecting ability of is restored.

The main body 16 of the dust collecting apparatus is arranged in a matrix in a direction in which the plurality of dust collecting units 15 as a whole traverse the gas flow passage 14. The dust collector main body 16 is the dust collecting unit 1
Every 5 operations are possible.

The first and second cleaning nozzles 17 and 18 are
It is made of steel pipe and is provided so as to face the dust collector main body 16 and extend parallel to the gravity direction. First and second cleaning nozzles 17,
18, one end 24 of the dust collector main body 16 is attached to the conveying means 20, and the dust collector main body 16 is provided on the side facing the dust collector main body 16.
A plurality of nozzle holes 25 for injecting the cleaning liquid toward are formed with a predetermined interval d1.

The cleaning liquid supply means 19 includes a cleaning liquid storage tank 27 for storing the cleaning liquid 26, a cleaning liquid supply pump 28 for supplying the cleaning liquid 26 to the second cleaning nozzle 18, and a first flow rate adjusting valve for adjusting the flow rate of the cleaning liquid 26. 29, a cleaning liquid supply passage 30 that constitutes a passage for the cleaning liquid 26, and a first thermometer 31 provided in the cleaning liquid supply passage 30 to measure the temperature of the cleaning liquid 26.
And a heater 32 provided inside the cleaning liquid storage tank 27 to heat the cleaning liquid 26, and a first power supply 33 connected to the heater 32. Although FIG. 2 shows only the downstream side of the gas flow passage 14 with respect to the main body 16 of the dust collector, which is the main part of the electrostatic precipitator 10, the upstream side of the gas flow passage 14 also includes the main body 16 of the dust collector. It is configured symmetrically with the downstream side.

Cleaning liquid 26 stored in the cleaning liquid storage tank 27
Is supplied under pressure by a cleaning liquid supply pump 28, and is supplied to the second cleaning nozzle 18 through a cleaning liquid supply passage 30 and a carriage 34 of a transfer means 20 described later. The first flow rate adjusting valve 29 can stop the supply of the cleaning liquid 26 by adjusting the flow rate of the cleaning liquid 26 supplied to the second cleaning nozzle 18 and closing the valve.

The temperature of the cleaning liquid 26 may be room temperature which is the ambient environment temperature, but it is heated by the heater 32 to 30-8.
It may be kept in warm water in the range of 0 ° C. The temperature of the cleaning liquid 26 is maintained by controlling the first power supply 33 on-off. The on-off control of the first power supply 33 is
It may be performed by setting a timer, or may be performed by connecting the detection output of the first thermometer 31 to the control system of the first power supply 33. The cleaning liquid 26 can be supplied from the cleaning liquid supply means 19 to the first cleaning nozzle 17 with the same configuration as the second cleaning nozzle 18.

In this embodiment, warm water is used as the cleaning liquid 26. By using warm water as the cleaning liquid 26, it is possible to reliably clean and remove the dust containing the oil adsorbed to the electrode provided in the dust collector main body 16, so that the number of times the dust collector main body 16 is cleaned can be reduced. It is possible to improve the operation rate of the dust collector, and to suppress the spark discharge that occurs between the electrodes of the dust collector main body 16 to prevent the dust collection efficiency from decreasing.

The conveying means 20 comprises a carriage 34 on which the first and second cleaning nozzles 17 and 18 are mounted, a drive source 35 mounted on the carriage 34 to drive the carriage 34, and a track on which the carriage 34 travels. And a rail 36 for Trolley 34
Is provided with an axle 37 extending in a direction orthogonal to the transport direction, in the present embodiment, a gas flow direction, and wheels 38 are mounted on the axle 37. The drive source 35 is an electric motor, and the driving force of the electric motor 35 is transmitted to the axle 37 and the wheels 38 via, for example, gears provided on the axle 37, so that the wheels 38.
The carriage 34 can move on the rail 36 by rotating. When the carriage 34 moves on the rail 36, the first and second cleaning nozzles 17 and 18 mounted on the carriage 34 cause the dust collection unit 15 to be cleaned.
Is transported to a position facing.

The dust collector main body 16 and the conveying means 20 are
It is installed in a pallet 40 provided on a floor 39 that forms the bottom surface of the gas flow passage 14. Bottom plate 4 of pallet 40
1, a gradual slope is formed from the right side to the left side facing the upstream side of the gas flow passage 14 and from the downstream side to the upstream side of the gas flow passage. As a result, the water or hot water that has been sprayed from the first and second cleaning nozzles 17 and 18 toward the dust collector main body 16 and has been used for cleaning is collected in the corner portion 42 of the pallet 40. The water or warm water collected from the corners 42 of the pallet 40 is then treated as clear water by a sedimentation device, filter filtration, etc., and then discarded. In this embodiment, the corner portion 42 of the pallet 40 is
Although the water or hot water collected from the above is discarded, a circulation device may be provided and returned to the cleaning liquid storage tank 27 for reuse.

The protective wire net 21 has substantially the same size as the cross-sectional dimension of the dust collector main body 16 orthogonal to the gas flow direction.
The dust collector main body 16 is provided across the gas flow passage 14 on the upstream side and the downstream side of the gas flow passage 14. The protective wire net 21 includes a frame member 43 made of steel and having rigidity, and a frame member 4
3 includes a wire member 44 made of a steel wire stretched inward of each other. Unlike the conventional structure in which the protective wire net 21 is fixedly provided for each dust collecting unit, the protective wire net 21 is provided in such a size that it can cover the dust collector main body 16, so that it is possible to remove only the protective wire net 21. If 21 is damaged or clogged, it is easy to repair, maintain, clean and replace. Furthermore, since it is possible to omit the frame for fixing the protective wire mesh to each dust collecting unit as in the conventional case, it is possible to realize a low pressure loss of gas. Protective wire net 21
Since the first door structure 45 that can be opened and closed is provided in the container, an operator can enter and exit for maintenance and inspection of the dust collector main body 16. The first door structure 45 is also constructed such that a steel wire door wire member 47 is stretched inside a steel door frame member 46 so that gas pressure loss does not occur.

The frame 22 constitutes a part of the protective wire net 21 and also serves as an outer shell member forming a part of the gas flow passage 14. The frame 22 has a second door structure 4 that can be opened and closed so that an operator can enter and leave the gas flow passage 14.
8 is formed.

The first and second door structures 45, 48 are constructed so as to open the door only toward the upstream side of the gas flow passage 14 shown by the arrows 49, 50, 51. FIG. 4 is a sectional view taken along the section line IV-IV in FIG. FIG. 4 shows the configuration of the first door structure 45 as an example of the door structure of the present embodiment. The first door structure 45 is, in detail, the protective wire mesh 21.
The one end portion 52 of the door frame member 46 is attached to the frame member 43 by the hinge pin 53, the first door structure 45 is angularly displaced around the hinge pin 53, and the gas flow passage 14 indicated by the arrow 49 is attached.
It becomes possible to open toward the upstream side of.

However, the other end 54 of the door frame member 46
Is prevented from being angularly displaced toward the downstream side of the gas flow passage 14 by the door support member 55 having an L-shaped cross section which constitutes a part of the protective wire net 21, and the frame member 43 serves as a barrier. The object 45 is configured so that it cannot be opened toward the downstream side of the gas flow passage 14. The second door structure 48 is also configured similarly to the first door structure 45 and cannot be opened toward the downstream side of the gas flow passage 14. This prevents the door structure from undesirably opening due to the wind pressure when the gas flows through the gas flow passage 14.

The first and second door structures 45 and 48 provided on the protective wire net 21 and the frame 22 are provided on the first and second door structures 45 and 48 in order to prevent electric shock accidents for workers.
A safety switch 56 is provided that allows the operation of the electrostatic precipitator 10 to be stopped when the switch is opened and allows the electrostatic precipitator 10 to be operated when the switch is closed. Undesired opening of the first and second door structures 45, 48 is prevented by making the first and second door structures 45, 48 open only toward the upstream side of the gas flow passage 14. Therefore, the operation of the electrostatic precipitator 10 can be prevented from being unnecessarily stopped and the operating rate can be improved.

In the present embodiment, the first and second cleaning nozzles 17 and 18 are configured so that they can be transported in the direction orthogonal to the gas flow direction by the transporting means 20, so that the first and second cleaning nozzles 17 and 18 can be transported. 18 is transported to a position facing the dust collection unit 15 to be cleaned only when cleaning, and the first is used when not cleaning.
Also, the second cleaning nozzles 17 and 18 can be retracted from the dust collector main body 16 to a position that does not hinder the flow of gas. Further, it is not necessary to always provide the cleaning nozzle at the position facing the dust collector main body 16, and the first and second cleaning nozzles 1 are positioned at the position facing the dust collecting unit 15 to be cleaned only during cleaning.
Since 7, 18 can be transported, the number of cleaning nozzles can be reduced. As a result, it is possible to reduce the pressure loss of gas that has been generated due to a large number of conventionally installed cleaning nozzles.

The first and second cleaning nozzles 17, 1 provided on the upstream side and the downstream side of the gas flow passage 14, respectively.
8 is conveyed to the opposite position, and the first cleaning nozzle 17 and the second cleaning nozzle 17
By spraying the cleaning liquid 26 from the cleaning nozzle 18 at the same time, a shielding effect is produced by the cleaning liquids 26 that are sprayed, so that the scattering of the cleaning liquid 26 can be reduced. Therefore, it is possible to omit the installation of the damper which is conventionally provided to prevent the scattering of the cleaning liquid during cleaning.
By omitting the damper, it is possible to prevent the pressure loss that has been conventionally caused by installing the damper. Further, by omitting the damper, the natural ventilation force based on the pressure difference between the exit and the entrance of the road tunnel 13 and the traffic ventilation force which is the ventilation force by the wind generated by the passage of the vehicle are used for the ventilation in the road tunnel 13. Can be effectively utilized at all times. The number of cleaning nozzles is reduced and the number of parts is reduced by omitting dampers, which simplifies the configuration and reduces the pressure loss, which suppresses the increase in the capacity of the exhaust fan power, thus reducing manufacturing costs and running costs. .

FIG. 5 is a front view showing a simplified structure of a main part of an electrostatic precipitator 60 according to a second embodiment of the present invention. The electrostatic precipitator 60 of the present embodiment is similar to that of the first embodiment, and corresponding parts are designated by the same reference numerals and description thereof is omitted.

The electrostatic precipitator 60 of the present embodiment has the second cleaning nozzle 18 in the plane including the second cleaning nozzle 18 on the upstream side and the downstream side of the gas flow passage 14 with respect to the dust collector main body 16. Provided in parallel with the dust collector main body 16
Air nozzle 61 for injecting air toward the nozzle, and air nozzle air supply means 62 for supplying air to the air nozzle 61.
And an air supply unit 63 for supplying air to the second cleaning nozzle 18, and a cleaning liquid supply unit 19 and an air supply unit 63 interposed between the second cleaning nozzle 18 and the cleaning liquid supply unit 1.
It further includes a switching means 64 for switching between the cleaning liquid 26 supplied to the second cleaning nozzle 18 and the air by switching the supply passages provided in 9 and the air supply means 63. Figure 5
Although only the downstream side of the gas flow passage 14 is shown with respect to the main part 16 of the electrostatic precipitator 60, the upstream side of the gas flow passage 14 is also shown with respect to the main body 16 of the dust collector. It is configured symmetrically with the downstream side.

The air nozzle 61 is made of steel pipe and is provided so as to face the dust collector main body 16 and extend parallel to the gravity direction.
One end 65 of the air nozzle 61 has the conveying means 20.
Mounted on the dust collector main body 16 and has a plurality of nozzle holes 66 for injecting air toward the dust collector main body 16.
Are formed with a predetermined spacing d1.

The air nozzle air supply means 62 pressurizes air and sends it to the air nozzle 61.
A second flow rate adjusting valve 68 that adjusts the flow rate of air, and a first air supply path 69 that constitutes a flow path of air. The first air supply path 69 is connected to the air nozzle 61 via the inside of the carriage 34.

The air pressurized and fed by the first compressor 67 reaches the air nozzle 61 via the first air supply path 69 and the carriage 34, and is supplied to the dust collector main body 16 from the nozzle hole 66 formed in the air nozzle 61. It is jetted toward.
The second flow rate adjusting valve 68 can stop the supply of air by adjusting the flow rate of the air supplied to the air nozzle 61 and closing the valve.

By providing the air nozzle 61 in parallel with the first and second cleaning nozzles 17, 18,
Since air is jetted from the air nozzle 61 in parallel with the washing liquid 26 jetted from the second washing nozzles 17 and 18, an air curtain is formed on the side of the jetting washing liquid 26 and the washing liquid 26 scatters to the surroundings. Is suppressed. Further, since the injection pressure of air is added to the injection pressure of the cleaning liquid 26, the effect of cleaning the dust collection unit 15 is increased.
Further, after the injection of the cleaning liquid 26 is stopped, by continuing the air injection for a while, the washed dust collecting unit 15 is drained, so that the drying time can be shortened.

The air nozzle air supply means 62 may be equipped with an air heater for heating the air, a power source for supplying electric power to the air heater, and a temperature detector for detecting the temperature of the air. As a result, since warm air can be jetted to the dust collector main body 16, it is possible to further shorten the drying time after cleaning the dust collector main body 16.

The air supply means 63 includes a second compressor 70 that pressurizes air and supplies it to the second cleaning nozzle 18, an air heater 71 that heats the air, and a second power source 72 that supplies electric power to the air heater 71. A third flow rate adjusting valve 73 that adjusts the flow rate of air, a second air supply path 74 that forms an air flow path, and a second thermometer 75 that detects the temperature of the air in the second air supply path 74. Including and The air pressurized and supplied by the second compressor 70 is supplied to the second cleaning nozzle 18 through the second air supply passage 74 and the carriage 34, and is collected from the nozzle holes 25 formed in the second cleaning nozzle 18. It is jetted toward the main body 16. The third flow rate adjusting valve 73 is the second
The air supply can be stopped by adjusting the flow rate of the air supplied to the cleaning nozzle 18 and closing the valve.

The air pressurized and fed by the second compressor 70 is approximately 30 to 1 by the air heater 71.
You may heat to the range of 00 degreeC. The air heater 71 is composed of, for example, a heater, and the temperature of the air is maintained by controlling the second power supply 72 on-off. The on-off control of the second power supply 72 may be performed by setting a timer, or the detection output of the second thermometer 75 may be connected to the control system of the second power supply 72.

The switching means 64 is, for example, a 3-port directional control valve, and has first and third flow rate adjusting valves 29, 73.
Between the second cleaning nozzle 18 and the second cleaning nozzle 18, the cleaning liquid supply conduit 30 and the second air supply conduit 74 are switched to select and supply either the cleaning liquid 26 or the air to the second cleaning nozzle 18. be able to. With the same configuration as the second cleaning nozzle 18, the cleaning liquid 26 and air can be switched and supplied also to the first cleaning nozzle 17. First and second
The cleaning liquid 26 or the air supplied to the cleaning nozzles 17 and 18 can be switched by opening one of the first flow rate adjusting valve 29 and the third flow rate adjusting valve 73 and closing the other, or vice versa. Since the operation of the flow rate adjusting valve becomes complicated, the first and third flow rate adjusting valves 29, 7
It is preferable to adjust the flow rates of the cleaning liquid 26 and the air according to 3 and operate the switching means 64 to switch.

By making the cleaning liquid 26 supplied to the first and second cleaning nozzles 17 and 18 and the air switchable, the cleaning liquid 26 is jetted from the first and second cleaning nozzles 17 and 18 to collect the dust collector main body. After washing 16, the air can be jetted from the first and second washing nozzles 17 and 18 to drain and dry the dust collector main body 16.

Conventionally, after the main body of the dust collector is washed with the cleaning liquid, a gas containing dust is immediately passed through the main body of the dust collector to collect the dust without spraying clean air to drain and dry the main body. Dust adhered to the water droplets remaining on the electrodes provided in the main body of the dust collector, and it was necessary to wash again even though the operating time was relatively short after washing.

After cleaning the dust collector main body 16, the clean air from the air nozzle 61 is jetted or the cleaning liquid 26 is switched from the first and second washing nozzles 17 and 18 to the clean air and jetted, and the dust collector main body is sprayed. By draining and drying 16, the cleanliness of the electrode surface of the dust collector main body 16 can be improved. In addition, by heating the air jetted from the first and second cleaning nozzles 17 and 18 to 30 to 100 ° C. to generate warm air, the drying time after cleaning the dust collector main body 16 is further shortened, and the operating rate of the apparatus is increased. Can be improved.

FIG. 6 is a front view showing a simplified configuration of the essential parts of an electrostatic precipitator 80 according to the third embodiment of the present invention, and FIG. 7 is an electrostatic precipitator showing the essential parts in FIG. It is a perspective view which simplifies and shows the structure of the shielding plate 81 with which the apparatus 80 is equipped. The electrostatic precipitator 80 of the present embodiment is similar to that of the first embodiment, and corresponding parts are designated by the same reference numerals and description thereof is omitted.

The electrostatic precipitator 80 of the present embodiment is provided in each of the upstream side and the downstream side of the gas flow passage 14 with respect to the main body 16 of the dust collector, and is a part of the main body 16 of the dust collector. Of the dust collecting unit 15, a shield plate 81 having a width w1 substantially equal to the lateral width of the portion to be cleaned and a height h1 substantially equal to the height of the portion to be cleaned;
A cleaning nozzle 83 provided on a surface 82 (hereinafter, also referred to as a shield plate inner surface) facing the dust collector main body 16 and spraying the cleaning liquid 26 toward the dust collector main body 16, and a cleaning liquid on the cleaning nozzle 83. A cleaning liquid supply means 19 for supplying 26,
The transportation means 20 for transporting the shielding plate 81 in a direction orthogonal to the gas flow direction is included.

In the present embodiment, the portion to be cleaned of the dust collector main body 16 is selected as the portion in which the four dust collector units 15 are arranged in one line in the direction of gravity, but is not limited to this. Alternatively, the size of the portion to be cleaned, that is, the shielding plate may be selected to have a width substantially equal to the lateral width of the one or more dust collecting units 15 and a height substantially equal to the height of the unit dust collecting unit. When the height of the shielding plate is selected to be less than the height of the dust collector main body 16, the conveying means for conveying the shielding plate is configured to be movable at least in the gravity direction. Although FIG. 6 shows only the downstream side of the gas flow passage 14 with respect to the dust collector main body 16 of the main part of the electrostatic precipitator 80, the upstream side of the gas flow passage 14 also has the dust collector main body 16. It is configured symmetrically with the downstream side.

The shielding plate 81 is a rectangular flat plate made of a steel plate or hard synthetic resin, and has the above-mentioned dimensions: width w1 ×
It has a height h1 and can substantially cover one row of the plurality of dust collecting units 15 arranged in the direction of gravity. Shield 81
Is one side 84 that constitutes one end in the longitudinal direction of the shielding plate 81.
Is mounted on the carriage 34 at. The shield plate 81 is provided with a shield member 88 that rises from the edges of the other three sides 85, 86, 87 of the shield plate 81 except the one side 84 mounted on the carriage 34. The shielding member 88 is made of an elastic material such as rubber.

Cleaning nozzle 8 provided on the inner surface 82 of the shield plate
3 is made of steel pipe, and a pipe portion 89 extending in the direction of gravity,
4 which is orthogonal to the pipe portion 89 and extends along the dust collector main body 16
The nozzle part 90 of a book is included. In the four nozzles 90,
3 on the side facing the dust collector body 16 with a mutual distance d2
Individual nozzle holes 91 are formed for each of the nozzle portions 90. Cleaning liquid supply passage 30 of the cleaning liquid supply means 19
Is connected to the pipe portion 89 via the carriage 34, and the cleaning liquid 26 is supplied to the cleaning nozzle 83. Since the cleaning nozzle 83 is attached to the carriage 34 at the one end 92 of the pipe portion 89, the shield plate 81 and the cleaning nozzle 83 are the transfer means 20.
With this, it is possible to move in a direction traversing the gas flow passage 14 that is orthogonal to the gas flow direction.

When the shielding plates 81 provided on the upstream side and the downstream side of the gas flow passage 14 are conveyed to opposite positions and the cleaning liquid 26 is jetted from the cleaning nozzles 83 provided in each shielding plate 81, the shielding plates 81 and By the shielding member 88 provided on the edge of the shielding plate 81, the scattering of the cleaning liquid 26 to the surroundings can be efficiently reduced. Therefore, it is possible to omit the installation of the damper that has been conventionally provided for preventing the scattering of the cleaning liquid during cleaning, and by omitting the damper, it is possible to prevent the pressure loss that has occurred due to the conventional damper. .

Further, the shielding member 81 may be constructed so as to be angularly displaceable on the carriage 34 with respect to one axis parallel to the gravity. As a result, when the dust collector main body 16 is not cleaned, the shielding plate 81 can be angularly displaced about the axis so as to be housed so as to be parallel to the gas flow direction. The pressure loss of the gas flowing through 14 can be reduced, and the storage space of the shielding plate 81 in the gas flow passage 14 can be reduced.

Next, a method of cleaning the dust collector main body 16 in the electric dust collector 60 having the switching means 64 will be described. FIG. 8 shows the dust collector main body 1 of the electric dust collector 60.
6 is a flowchart illustrating an example of the cleaning method of No. 6.

At the start of step a1, the dust collector main body 16 is in the operation of removing dust from the gas flowing through the gas flow passage 14, and the dust collector main body 16 is not washed. The first and second cleaning nozzles 17 and 18 are at the retracted position where they do not come off the dust collector main body 16 and hinder the flow of gas. In step a2, the operation of the dust collection unit 15 to be cleaned is stopped. When there are a plurality of dust collecting units 15 to be washed, the order of washing of the plurality of dust collecting units 15 to be washed is predetermined. Further, when there are a plurality of dust collecting units 15 to be cleaned, the dust collecting units 15 may be stopped at the same time, or may be sequentially stopped according to the cleaning order. In the present embodiment, the operation of the plurality of dust collecting units 15 to be cleaned is stopped all at once.

At step a3, the first and second cleaning nozzles 17 and 18 are transferred by the transfer means 20 to a position facing the dust collecting unit 15 to be cleaned. In step a4, the switching means 64 switches the supply path to a state in which the first and second cleaning nozzles 17, 18 can be supplied with hot water as the cleaning liquid. In step a5, the hot water is jetted from the first and second cleaning nozzles 17 and 18 toward the dust collecting unit 15 to be washed, and the dust collecting unit 15 is washed.

At step a6, the switching means 64 switches the supply passage to a state in which the first and second cleaning nozzles 17 and 18 can be supplied with air instead of the hot water. At step a7, air is jetted from the first and second cleaning nozzles 17 and 18 toward the dust collecting unit 15 after the cleaning,
Draining and drying of the dust collection unit 15 are performed.

In step a8, it is judged whether or not the cleaning order of the dust collecting unit 15 which has been cleaned, drained and dried is the last predetermined order. When the determination is negative, the process returns to step a3, and the first and second cleaning nozzles 17 and 18 are conveyed by the conveying means 20 to a position facing the dust collecting unit 15 which is predetermined in the next cleaning order, and the subsequent steps are performed. Go to step. When the determination is positive, the process proceeds to step a9. At step a9, since the cleaning of the dust collecting unit 15 which is predetermined as the last cleaning order is completed, the first and second cleaning nozzles 17 and 18 are conveyed to the retracted position by the conveying means 20 and the dust collecting apparatus main body 16 is conveyed. Complete the washing.

According to such a cleaning method, cleaning and draining and drying are performed for each dust collecting unit 15 to be cleaned, so that the dust collecting unit 15 can be washed within a limited cleaning time.
The dust collector main body 16 which is an assembly of can be dried sufficiently and reliably.

Electrostatic precipitator 60 having switching means 64
In the above, another method of cleaning the dust collector main body 16 can be adopted. FIG. 9 is a flowchart illustrating another example of the method of cleaning the dust collector main body 16 in the electric dust collector 60.

At the start of step b1, the dust collector main body 16 is in the operation of removing dust from the gas flowing through the gas flow passage 14 as at the start of the flowchart shown in FIG. The first and second cleaning nozzles 17 and 18 are in the retracted position where they do not come off the dust collector main body 16 and hinder the flow of gas. In step b2, the operation of the dust collection unit 15 to be cleaned is stopped. When there are a plurality of dust collecting units 15 to be washed, the order of washing of the plurality of dust collecting units 15 to be washed is predetermined. In step b3, the switching means 64 switches the supply path to a state in which the first and second cleaning nozzles 17 and 18 can be supplied with hot water as the cleaning liquid.

In step b4, the first and second cleaning nozzles 17 and 18 are transferred by the transfer means 20 to a position facing the dust collecting unit 15 to be cleaned. In step b5, the warm water is jetted from the first and second cleaning nozzles 17 and 18 toward the dust collecting unit 15 to be washed, and the dust collecting unit 15 is washed. In step b6, it is determined whether or not the cleaning order of the dust collecting unit 15 that has been cleaned is the last predetermined order. When the judgment is negative,
Returning to step b4, the first and second cleaning nozzles 17,
18 is conveyed by the conveying means 20 to a position facing the dust collecting unit 15 which is predetermined in the next cleaning order, and proceeds to the subsequent steps.

When the determination is affirmative, the process proceeds to step b7. In step b7, the switching means 64 switches the supply path to a state in which the first and second cleaning nozzles 17 and 18 can be supplied with air instead of the hot water. In step b8, air is jetted from the first and second cleaning nozzles 17 and 18 toward the dust collecting unit 15 which is the last cleaning order set in advance, and the dust collecting unit 15 is drained and dried. In step b9, since the cleaning, draining and drying of the dust collecting unit 15 which is predetermined as the last cleaning order are completed, the first and second cleaning nozzles 17 and 18 are conveyed to the retracted position by the conveying means 20 and collected. The cleaning of the dust device body 16 is completed.

As described above, in the cleaning method of another example, for the dust collecting units 15 other than the last dust collecting unit 15 to be cleaned based on the predetermined order,
Only the cleaning in which the hot water 26 is sprayed from the first and second cleaning nozzles 17 and 18 is performed, and only the last dust collecting unit 15 to be cleaned based on a predetermined order is first and second cleaning nozzles 17. , 18 to inject hot water 26 to wash and then air to inject the first and second washing nozzles 1
Draining and drying of 7, 18 and the dust collecting unit 15 are performed. As described above, since the total time required for cleaning and drying the dust collector main body 16 is shortened by reducing the number of times of draining and drying, it is possible to improve the operation rate of the apparatus. Further, since the air is jetted from the first and second cleaning nozzles 17 and 18 only to the last-order dust collecting unit 15 to be cleaned, the first and second cleaning nozzles 17 and 18 perform the first operation during the cleaning and draining and drying operations of the dust collector main body 16. Further, it is possible to reduce the amount of air used ejected from the second cleaning nozzles 17 and 18. By reducing the amount of air used, it is possible to reduce the capacity of the air supply means 63 and reduce the power consumption.

Further, an electrostatic precipitator 80 having a shielding plate 81
Then, when the operation of the dust collecting unit 15 is stopped, the shielding plate 81 is conveyed to a position facing the dust collecting unit 15 whose operation has been stopped by the conveying means 20, and the dust collecting unit 15 whose operation has been stopped is gasified by the shielding plate 81. It is possible to prevent the dust collection efficiency from decreasing by blocking the upstream and downstream sides of the flow passage 14 to prevent the gas from flowing into the dust collection unit 15 that has stopped operating.

The position of the dust collection unit 15 whose operation has stopped can be known as follows. For example, an energization detector is provided in the power supply circuit for the dust collection unit 15,
The detection output of the energization detector is input to a central control device that controls the traffic of the road tunnel 13 and controls the operation of various facilities including the electric dust collector 80 installed in the ventilation station 11 and the ventilation tunnel 12. . By providing the display means corresponding to the detection output of the energization detector from each dust collection unit 15 input to the central control unit, the operator of the central control unit can identify the dust collection unit 15 that has stopped operating. it can. When the dust collection unit 15 that has stopped operating is specified, the remote control from the central controller or the worker goes to the site where the electric dust collector 80 is installed, and the upstream side and the downstream side of the gas flow passage 14 are connected. The shield plate 81 is conveyed by the conveying means 20 to a position facing the dust collecting unit 15 whose operation has stopped.

By shielding the dust collecting unit 15 whose operation is stopped by the shielding plate 81 between the upstream side and the downstream side of the gas flow passage 14, the flow of gas to the stopped dust collecting unit 15 is prevented, The gas, the flow of which is blocked, flows through the dust collecting unit 15 in operation adjacent to the dust collecting unit 15 that has stopped operating, and is removed. Therefore, the gas containing dust does not flow through the dust collection unit 15 whose operation has stopped without being removed, so that the dust collection efficiency is prevented from lowering.

Generally, the electrode provided in the main body of the dust collector of the electric dust collector is a thin copper alloy plate having a thickness of 0.4 to 0.5 mm, so that a fire may occur in a road tunnel, a ventilation center or a ventilation tunnel. Then, there is a problem that the radiation heat of the flame and the heat of the smoke generated by the fire cause deformation and damage. The electrostatic precipitators 10, 60 of the present embodiment,
Reference numeral 80 denotes the first and second cleaning nozzles 1 by the transfer means 20 when a fire occurs in the gas flow passage 14.
7, 18 or the cleaning nozzle 83 is conveyed in a direction orthogonal to the gas flow direction, and the cleaning liquid 26 is sprayed from the cleaning nozzles 17, 18, 83 toward the dust collector main body 16 to cool the dust collector main body 16. However, the dust collector main body 16 can be prevented from being damaged.

A fire detector for detecting a fire is installed in the road tunnel 13, the ventilation station 11 and the ventilation tunnel 12 of the road tunnel 13. The detection output of the fire detector is input to, for example, the central control unit, and is configured so that it is possible to know at which point of the long road tunnel 13 the fire has occurred.

When a fire occurs and the point is specified,
The operator confirms the evacuation directions of the passing vehicles and the pedestrians in the road tunnel 13 near the fire occurrence point by the central control device, and operates the blower fan so as to exhaust air in the direction opposite to the evacuation direction. Thereafter, by remote control from the central control unit or by an operator going to the site where the electrostatic precipitator 80 is installed, the first and second cleaning nozzles 17 and 18 or the cleaning nozzle 83 are conveyed by the conveying means 20 to the gas flow passage. It is reciprocated in a direction traversing 14 and conveyed. The cleaning liquid 26 is jetted toward the dust collector main body 16 from the conveyed first and second cleaning nozzles 17 and 18 or the cleaning nozzle 83 to cool the dust collector main body 16 with the cleaning liquid 26. The cleaning liquid 26 used in the event of a fire is preferably unheated water. As a result, the dust collector main body 16 can be protected from the radiation heat due to the flame or the heat included in the fire smoke, and the heat damage to the electrodes provided in the dust collector main body 16 can be prevented.

(Examples) Examples of the present invention will be described below.

Using the electrostatic precipitator 10 shown in FIG. 1, the gas pressure P1 on the upstream side and the gas pressure P2 on the downstream side of the gas flow passage 14 are measured, and the pressure P1 and the pressure P are measured.
The pressure loss given by the difference ΔP (= P1-P2) from 2 was determined. Velocity of gas passing through the electrostatic precipitator 10: (15 m / sec), treated air volume: (8.5 m ³ /
The pressure P1 and P2 were measured and the pressure loss ΔP was found to be 160 Pa. Under the same conditions as above, in the conventional electrostatic precipitator, the cleaning nozzle and the pipe for supplying the cleaning liquid to the cleaning nozzle are permanently installed at a position facing the main body of the dust collector, and a damper is provided to prevent scattering of the cleaning liquid during cleaning. The measured pressure loss is 2
It was 80 Pa.

The first and second cleaning nozzles 17, 18 are
When the dust collector main body 16 is not washed, the dust collector main body 16 is retracted to a position away from the dust collector main body 16, and only when the dust collector main body 16 is washed, the dust collector main body 16 is conveyed to a facing position. By omitting the configuration,
The pressure loss could be reduced by 120 Pa as compared with the conventional electrostatic precipitator.

As described above, in the present embodiment,
The first and second cleaning nozzles 17 and 18 are the gas flow passages 14.
However, the present invention is not limited to this, and the conveying means 20 is provided so as to be movable in the direction of gravity, and the first and second cleaning nozzles 17 and 18 traverse the gas flow passage 14. The dust collector main body 16 may be cleaned by being provided in the direction of gravity and transported from the top to the bottom in the gravity direction. Further, although the shielding plate 81 is conveyed in the direction traversing the gas flow passage 14, the present invention is not limited to this, and a shielding plate having a height less than the height of the dust collector main body 16 is provided to convey the conveying means. 20 may be provided so as to be movable in the direction of gravity, and the dust collector main body 16 may be washed by transporting the shielding plate from the top to the bottom in the direction of gravity. As a result, the dirty water generated by cleaning the dust collector main body 16 flows from the cleaned dust collecting unit toward the uncleaned dust collecting unit.
Do not pollute the cleaned dust collection unit.

Further, the first and second cleaning nozzles 17, 18
Is 1 on each of the upstream side and the downstream side of the gas flow passage 14.
However, the number is not limited to this, and two or more may be provided on the upstream side and the downstream side, respectively.

The air nozzles 61 are provided one each on the upstream side and the downstream side of the gas flow passage 14, but the number is not limited to this, and two nozzles are provided on each side of the cleaning nozzle on the upstream side and the downstream side. It may be configured to be provided respectively. Further, the transporting means 20 is provided on the floor portion 39 of the gas flow passage 14, but is not limited to this, and may be provided on the upper surface (ceiling portion) of the gas flow passage 14, Floor 39
The structure may be provided on both the ceiling and the ceiling.

[0108]

According to the present invention, since the cleaning nozzle can be conveyed by the conveying means in the direction orthogonal to the gas flow direction, the cleaning nozzle is located at a position facing the dust collecting unit to be cleaned only at the time of cleaning. When the cleaning nozzle is transported and is not cleaned, the cleaning nozzle can be retracted from the dust collector main body to a position that does not hinder the flow of gas. Further, since it is not necessary to always provide the cleaning nozzle at the position facing the dust collector main body, and the cleaning nozzle can be conveyed to the position facing the dust collecting unit to be cleaned only during cleaning, the number of cleaning nozzles can be reduced. it can. As a result, it is possible to reduce the pressure loss of gas that has been conventionally generated due to the permanently installed cleaning nozzle.

Further, the cleaning nozzles provided on the upstream side and the downstream side of the gas flow passage are conveyed to the opposite positions, and the cleaning liquid is jetted simultaneously from the respective cleaning nozzles.
Since the spraying cleaning liquid produces a shielding effect, the scattering of the cleaning liquid can be reduced. Therefore, it is possible to omit the damper that is conventionally provided to prevent the scattering of the cleaning liquid during cleaning. By omitting the damper, it is possible to prevent the pressure loss that has been conventionally caused by installing the damper. Also, by omitting the damper, the natural ventilation force based on the pressure difference between the exit and the entrance of the road tunnel and the traffic ventilation force, which is the ventilation force due to the wind generated by the passage of cars, are always effective for ventilation in the road tunnel. Can be utilized.

As described above, the structure is simplified by reducing the number of cleaning nozzles and the number of parts by omitting dampers, and the reduction in pressure loss suppresses an increase in the capacity of the exhaust fan power. The cost can be reduced.

Further, according to the present invention, the cleaning nozzle cleans the dust collector main body while moving from the upper direction to the lower part of the dust collector main body, and cleans the dirty water generated by cleaning the dust collector main body. Since the dust collection unit that has been cleaned flows toward the dust collection unit that has not been cleaned, the cleaned dust collection unit is not contaminated.

Further, according to the present invention, since the shielding plate having the cleaning nozzle can be conveyed by the conveying means in the direction orthogonal to the gas flow direction, the dust collecting unit which should be washed only when the shielding plate is washed is used. The shielding plate can be conveyed to the facing position and can be retracted to a position where it does not interfere with the flow of gas when the cleaning plate is not cleaned and is separated from the dust collector main body. Further, since it is not necessary to always provide the cleaning nozzle at the position facing the dust collector main body, and the shielding plate having the cleaning nozzle can be transported to the position facing the dust collecting unit to be cleaned only at the time of cleaning, the number of cleaning nozzles can be reduced. Can be reduced. As a result, it is possible to reduce the pressure loss of gas that has been conventionally generated due to the permanently installed cleaning nozzle.

Further, when the shielding plates provided on the upstream side and the downstream side of the gas flow passage are conveyed to the opposite positions and the cleaning liquid is jetted from the cleaning nozzles provided on the respective shielding plates, the scattering of the cleaning liquid is reduced by the shielding plate. can do. Therefore, it is possible to omit the damper that is conventionally provided to prevent the scattering of the cleaning liquid during cleaning. By omitting the damper, it is possible to prevent the pressure loss that has been conventionally caused by installing the damper.

As described above, the configuration is simplified by reducing the number of washing nozzles and the number of parts by omitting dampers, and the reduction in pressure loss suppresses the increase in the capacity of the exhaust fan power. The cost can be reduced.

Further, according to the present invention, the shielding plate having the cleaning nozzle cleans the dust collector main body while moving from the upper direction to the lower side of the dust collector main body, and is generated by cleaning the dust collector main body. Since the collected waste water flows from the washed dust collection unit toward the unwashed dust collection unit, the cleaned dust collection unit is not contaminated.

Further, according to the present invention, since the shielding plate is provided with the shielding member rising from the edge of the shielding plate, the scattering of the cleaning liquid sprayed from the cleaning nozzle to the surroundings can be prevented more efficiently. .

Further, according to the present invention, since the state in which the shielding plate is housed is parallel to the gas flow direction, the pressure loss of the gas flowing through the gas flow passage can be reduced, and the inside of the gas flow passage can be reduced. It is possible to reduce the storage space of the shielding plate in.

Further, according to the present invention, since the cleaning liquid is inexpensive water or warm water, the running cost can be kept low. Also, by using warm water as the cleaning solution,
The dust containing the oil adsorbed on the electrode of the main body of the dust collector can be reliably washed and removed. As a result, the number of times the dust collector body is cleaned can be reduced, the operating rate of the equipment can be improved, and the spark discharge that occurs between the electrodes of the dust collector body is suppressed to prevent the dust collection efficiency from decreasing. can do.

Further, according to the present invention, since the air can be jetted from the air nozzle in parallel with the washing liquid jetted from the washing nozzle, an air curtain is formed on the side of the jetted washing liquid. This can prevent the cleaning liquid from splashing to the surroundings. Moreover, since the jet pressure of air is added to the jet pressure of the cleaning liquid, the effect of washing the dust collecting unit is increased. After stopping the injection of the cleaning liquid,
By continuing the air injection for a while, the washed dust collecting unit is drained, so that the drying time can be shortened.

Further, according to the present invention, since the cleaning liquid supplied to the cleaning nozzle and the air can be switched, after the cleaning liquid is jetted from the cleaning nozzle to clean the dust collector main body,
It is possible to improve the cleanliness of the electrode surface of the dust collector body by ejecting air from the cleaning nozzle to drain and dry the dust collector body.

Further, according to the present invention, since at least one of the air supply means for the air nozzle and the air supply means is provided with the air heater, the cleaning liquid is sprayed from the cleaning nozzle to main body of the dust collector. After washing, the hot air, which is heated air, can be jetted from the air nozzle or the washing nozzle to drain and dry the dust collector main body. As a result, the drying time after cleaning the dust collector main body can be further shortened and the total time required for cleaning and drying the dust collector main body can be shortened, so that the operation rate of the device can be improved.

Further, according to the present invention, the protective wire net protecting the dust collector main body traverses the gas flow passage on either or both of the upstream side and the downstream side of the gas flow passage with respect to the dust collector main body. Is provided. This makes it possible to remove the protective wire net only because it is provided as an integrated protective wire net that covers the main body of the dust collecting device, unlike the protective wire net that is conventionally fixed and provided for each dust collection unit. In case of damage or clogging, it is easy to repair, maintain, clean and replace the protective wire mesh. Further, since it is possible to omit the frame for fixing the protective wire net to each dust collecting unit as in the conventional case, it is possible to realize a low pressure loss of gas. In addition, since the door structure is provided on the protective wire net and the frame forming the protective wire net,
When performing maintenance and inspection of the dust collector main body, an operator can easily go in and out.

Further, according to the present invention, since the door structure provided on the protective wire net and the frame is configured to open toward the upstream side of the gas flow passage, when the gas flows through the gas flow passage. The wind pressure does not undesirably open the door structure.

The door structure provided on the protective wire net and the frame is in a state in which the operation of the electrostatic precipitator is stopped and the door is closed in a state where the door structure is opened in order to prevent an electric shock from an operator. A safety switch is provided to enable operation of the electrostatic precipitator. Since the door structure is configured to open toward the upstream side of the gas flow passage, undesired opening of the door structure is prevented, so that the operation of the electrostatic precipitator is prevented from unnecessarily stopping. The operating rate can be improved.

Further, according to the present invention, during a fire, the cleaning means or the shielding plate having the cleaning nozzle is conveyed toward the dust collector main body while being conveyed in the direction orthogonal to the gas flow direction by the conveying means. Since the cleaning liquid is sprayed from the nozzle, the dust collector main body can be cooled. As a result, the dust collector main body can be protected from the radiation heat due to the flame or the heat contained in the fire smoke, and the heat damage to the dust collector main body can be prevented.

Further, according to the present invention, it is possible to convey the shielding plate to a position facing the dust collecting unit whose operation has stopped, and prevent the gas from flowing into the dust collecting unit whose operation has stopped by the shielding plate. As a result, only the gas flow to the dust collection unit that has stopped operating is efficiently blocked by the shield plate, and the gas that has been blocked from flowing to the dust collection unit that has stopped operating does not Since dust is removed by passing through the dust collecting unit adjacent to the unit, it is possible to prevent the dust collecting efficiency from decreasing.

According to the invention, the cleaning liquid is jetted from the cleaning nozzle for each dust collecting unit to be cleaned,
After the cleaning, air is jetted from the cleaning nozzle to drain and dry the cleaning nozzle and the dust collecting unit, so that the dust collector main body, which is an assembly of the dust collecting units, can be sufficiently dried within the limited cleaning time. And it can be done reliably.

According to the present invention, the dust collection units other than the last dust collection unit to be washed based on the predetermined order are only washed by injecting the washing liquid from the washing nozzle, and the dust collection units are set in advance. Only for the last dust collecting unit to be cleaned based on the order, the cleaning liquid is sprayed from the cleaning nozzle to clean, and then air is sprayed from the cleaning nozzle to drain and dry the cleaning nozzle and the dust collecting unit. As a result, the total time required for cleaning and drying the dust collector main body can be shortened, and the operating rate of the device can be improved. Also, only for the last dust collecting unit to be cleaned,
Since the air is jetted from the washing nozzle, it is possible to reduce the amount of air used to be jetted from the washing nozzle during the washing and drying operations of the dust collector main body. By reducing the amount of air used, it is possible to reduce the capacity of the cleaning nozzle air supply means and reduce power consumption.

[Brief description of drawings]

FIG. 1 is an electrostatic precipitator 10 according to an embodiment of the present invention.
It is a perspective view which simplifies and shows the structure of.

FIG. 2 is a front view showing a simplified configuration of a main part of the electrostatic precipitator 10 shown in FIG.

FIG. 3 is a road tunnel 1 including a ventilation place 11 or a ventilation tunnel 12 in which the electrostatic precipitator 10 shown in FIG. 1 is installed.
It is a perspective view which simplifies and shows the whole 3 structure.

FIG. 4 is a sectional view taken along the section line IV-IV in FIG.

FIG. 5 is a front view showing a simplified configuration of a main part of an electrostatic precipitator 60 according to a second embodiment of the present invention.

FIG. 6 is a front view showing a simplified configuration of a main part of an electrostatic precipitator 80 according to a third embodiment of the present invention.

7 is a perspective view showing a simplified configuration of a shield plate 81 included in the electrostatic precipitator 80, the main part of which is shown in FIG.

FIG. 8 is a flowchart illustrating an example of a method of cleaning the dust collector main body 16 in the electric dust collector 60.

FIG. 9 is a flowchart illustrating another example of the cleaning method of the dust collector main body 16 in the electric dust collector 60.

FIG. 10: Dust collection unit 1 included in the conventional electric dust collector
It is a figure which simplifies and shows the composition of cleaning nozzle 2.

[Explanation of symbols]

10,60,80 Electric dust collector 14 gas flow passage 15 Dust collection unit 16 Dust collector body 17 First cleaning nozzle 18 Second cleaning nozzle 19 Cleaning liquid supply means 20 Transport means 21 Protective wire mesh 61 air nozzle 62 Air Nozzle Air Supply Means 63 Air supply means for cleaning nozzle 64 switching means 81 Shield 83 Washing nozzle 88 Shielding member

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B08B 3/10 B08B 3/10 Z E21F 5/00 E21F 5/00 (72) Inventor Masaya Inagaki Kobe, Hyogo Prefecture 3-1-1 Higashikawasaki-cho, Chuo-ku, Kawasaki, inside the Kawasaki Heavy Industries, Ltd. Kobe factory (72) Inventor Yasushi Arao 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe, Hyogo Prefecture ) 3B201 AA47 AB53 BB22 BB82 BB92 CC12 4D054 AA07 DA06 DA11 DA18

Claims (16)

[Claims] 1. An electrostatic precipitator which is installed in a gas flow passage and removes fine particles contained in a gas. A dust collecting unit for removing fine particles from a gas containing fine particles flowing between electrodes to which a voltage is applied. Are provided on the upstream side and the downstream side of the gas flow passage with respect to the main body of the dust collector, respectively, and are directed toward the main body of the dust collector. Electrostatic precipitator including: a cleaning nozzle for injecting the cleaning liquid with a cleaning liquid; a cleaning liquid supply unit for supplying the cleaning liquid to the cleaning nozzle; and a transfer unit for transferring the cleaning nozzle in a direction orthogonal to the gas flow direction. apparatus. 2. A plurality of the cleaning nozzles are arranged in a straight line in the lateral direction of the dust collector main body, and are conveyed downward from above the dust collector main body by the conveying means. The electrostatic precipitator according to claim 1, wherein a cleaning liquid is sprayed to wash the main body of the precipitator. 3. An electrostatic precipitator which is installed in a gas flow passage and removes fine particles contained in gas. A dust collection unit for removing fine particles from a gas containing fine particles flowing between electrodes to which a voltage is applied. Are provided on the upstream side and the downstream side of the gas flow passage with respect to the main body of the dust collector, respectively. Of the plurality of dust collecting units, which have a width and height approximately equal to the width and height of the portion to be cleaned, and the dust collecting unit body provided on the surface of the shielding plate facing the dust collecting unit body. And a cleaning nozzle for injecting the cleaning liquid toward the nozzle, a cleaning liquid supply unit for supplying the cleaning liquid to the cleaning nozzle, and a transfer unit for transferring the shielding plate in a direction orthogonal to the gas flow direction. Dust collector. 4. The width of the shielding plate is substantially equal to the width of a plurality of dust collecting units to be cleaned, the height of the shielding plate is substantially equal to the height of the unit dust collecting unit, and is shielded by the conveying means. 4. The electrostatic precipitator according to claim 3, wherein the dust collector main body is washed by injecting a cleaning liquid from a cleaning nozzle provided on the shielding plate while conveying the plate downward from above the dust collector main body. . 5. The electrostatic precipitator according to claim 3, wherein the shielding plate is provided with a shielding member rising from an edge of the shielding plate. 6. The shielding plate is housed so as to be parallel to a direction in which a gas flows in a gas flow passage when the cleaning plate is not washed. Electric dust collector. 7. The electrostatic precipitator according to claim 1, wherein the cleaning liquid is water or warm water. 8. An air jet is provided toward the dust collector main body in parallel with the dust collector main body in a plane including the cleaning nozzle on the upstream side and the downstream side of the gas flow passage with respect to the dust collector main body. 7. An electrostatic precipitator according to any one of claims 1 to 6, further comprising: an air nozzle for controlling the air nozzle, and an air nozzle air supply unit for supplying air to the air nozzle. 9. An air supply means for supplying air to a cleaning nozzle, and a supply path provided between the cleaning liquid supply means and the air supply means and the cleaning nozzle, and provided between the cleaning liquid supply means and the air supply means. The electrostatic precipitator according to any one of claims 1 to 7, further comprising switching means for switching between the cleaning liquid supplied to the cleaning nozzle and the air. 10. The electrostatic precipitator according to claim 8, wherein at least one of the air supply unit for the air nozzle and the air supply unit is provided with an air heater for heating air. . 11. A protective wire net, which is provided on one or both of the upstream side and the downstream side of the gas flow passage with respect to the main body of the dust collector so as to cross the gas flow passage, and protects the main body of the dust collector. 11. The electricity collector according to claim 1, further comprising a dust device main body and a frame constituting a protective wire net, wherein the protective wire net and the frame are provided with an openable / closable door structure. Dust equipment. 12. The electrostatic precipitator according to claim 11, wherein a door structure provided on the protective wire net and the frame is configured to open toward an upstream side of the gas flow passage. 13. A shield plate provided with the electrostatic precipitator according to any one of claims 1 to 12, which is equipped with a cleaning nozzle or a cleaning nozzle by a transporting means when a fire occurs in the gas flow passage. Is conveyed in a direction orthogonal to the gas flow direction, and the cleaning liquid is sprayed from the cleaning nozzle toward the main body of the dust collector to cool the main body of the dust collector, preventing damage to the main body of the dust collector. How to operate the electrostatic precipitator. 14. A position where the electrostatic precipitator according to any one of claims 3 to 6 is prepared, and when the operation of the dust collecting unit is stopped, the dust collecting unit which has stopped its operation by the conveying means is faced. The shielding plate is transported to the dust collection unit, and the shielding unit shields the dust collection unit whose operation has stopped between the upstream side and the downstream side of the gas flow passage to prevent gas from flowing through the dust collection unit that has stopped operating. A method for operating an electrostatic precipitator, characterized by preventing a decrease in efficiency. 15. The electric dust collector according to any one of claims 9 to 12 is prepared, and the cleaning liquid is sprayed from a cleaning nozzle toward a dust collecting unit to be cleaned, and the cleaning liquid is sprayed by the cleaning nozzle. After the completion of, the switching means switches the cleaning liquid supplied to the cleaning nozzle to air, sprays air from the cleaning nozzle toward the dust collecting unit, drains and dry the cleaning nozzle and the dust collecting unit, After the injection of the air by the cleaning nozzle is completed, the conveying means conveys the cleaning nozzle to a position facing the next dust collecting unit to be cleaned based on a predetermined order, and the air supplied to the cleaning nozzle is changed by the switching means. A method for cleaning an electrostatic precipitator, wherein the main body of the precipitator is cleaned by switching to a cleaning liquid. 16. The electrostatic precipitator according to any one of claims 9 to 12 is prepared, and the cleaning liquid is sprayed from a cleaning nozzle toward a dust collecting unit to be cleaned, and the cleaning liquid is sprayed by the cleaning nozzle. After the cleaning is completed, the conveying means conveys the cleaning nozzle to the position facing the next dust collecting unit to be cleaned based on the predetermined order, and the dust collecting unit facing the cleaning nozzle after the conveyance has the predetermined order. When it is the last dust collection unit to be cleaned based on, the cleaning liquid is sprayed from the cleaning nozzle toward the dust collection unit, and after the cleaning liquid has been sprayed by the cleaning nozzle, the cleaning liquid supplied to the cleaning nozzle by the switching means is Switching to air, spraying air from the cleaning nozzle toward the dust collection unit, draining and drying the cleaning nozzle and dust collection unit, and cleaning the dust collector main body A method for cleaning an electrostatic precipitator, comprising: