JPH0210703B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present inventor first provided a casing having an inlet for dust-containing gas and an outlet for clean gas, and provided rollers supported at intervals, and an endless belt between the rollers. A shaped dust collecting electrode is wound so as to be movable, and a chamber formed inside the dust collecting electrode has a structure in which an appropriate number of linear or rod shaped discharge electrodes are arranged in parallel at appropriate intervals and fixed. The present invention relates to an improvement of the above invention.

When the electrostatic precipitator according to the above invention is used in a place where conductive dust is generated, for example, in a room where a diesel engine is installed or where carbon soot is generated, as the usage time increases, the electrical discharge becomes more conductive. As dust adheres to the discharge electrode, the discharge electrode enlarges, the cross-sectional area through which the current flows increases, and the resistivity of the discharge electrode decreases, reducing the discharge effect and, therefore, the dust collection effect. There is.

An object of the present invention is to provide a movable electric discharge electrode and configure the electric discharge electrode to brush off dust adhering to the electric discharge electrode during traveling, thereby preventing a decrease in dust collection efficiency. .

The present invention also provides a structure in which the dust contained in the gas is pre-charged at the inlet of the dust-containing gas, or the charged dust is pre-agglomerated at the same time as the dust is pre-charged, so that as much dust as possible is transferred to the discharge electrode. The purpose is to prevent it from sticking.

Embodiments of the present invention will be described below based on the drawings. Reference numeral 1 denotes a casing, and 2 and 3 inlet ducts for dust-containing gas that protrude from the center of both front and rear walls of the casing 1 and communicate with the inside of the casing 1. ,
Reference numerals 4, 5, 6, and 7 indicate exhaust ports that open near both the left and right ends of the front and rear walls of the casing 1, and 8 and 9 indicate a support shaft 10 that is installed between the front and rear walls inside the left end of the casing 1. , 11, and 12 is an endless belt-shaped dust collection electrode wound movably between the rollers 8 and 9, which includes a stainless steel belt, a chain belt, a metal mesh belt, and a large number of Includes various types of belts, such as metal belts that are divided into narrow width belts.
Reference numerals 13 and 14 denote hanger supports, which pass through a chamber 15 formed inside the dust collecting electrode 12, and whose front and rear ends project outward from the exhaust ports 4, 5 and 6, 7, respectively, and which are connected to insulators 16, 17 and 1
It is supported by support beams 20, 21 and 22, 23 supported at 8, 19. 24 and 25 are the hanger supports 13 and 1 in the chamber 15.
26 is a group of pulleys that are pivotally supported on one frame 24, 27 is a group of pulleys that are pivotally supported on the other frame 25, and the pulley groups 26 and 27 are
are supported at positions offset from each other by one pulley,
The individual pulleys are made of, for example, Teflon, which does not require lubricating oil, has high temperature resistance, and is flexible enough to prevent disconnection. 28 and 29 are pulleys pivoted near the pulleys at both ends of the pulley group 27;
Those molded from the same material as the pulley groups 26 and 27 are used. 30 is an endless electric discharge,
It has a meandering part that is wound around the individual pulleys of the pulley groups 26 and 27 alternately, and a part that is wound around the pulleys 28 and 29 and runs perpendicularly, and the entire discharge pole 30 is wound so that it can run in circulation. equipped. In addition to using a 0.1 mm to 1.00 mm tungsten wire as the discharge electrode 30, a barbed chain 32 wound movably around a chain wheel group 31 as shown in Figure 5, a long and thin strip-shaped electrode, and various other endless materials are used. Electrodes may be used. Note that a high DC voltage is applied to the discharge electrode 30, and its polarity may be either negative or positive. Further, a pulse voltage may be applied in addition to the DC high voltage, and in that case, charging efficiency is significantly improved. Further, a high voltage DC or AC current is passed through the discharge electrode 30 to heat the discharge electrode 30 and remove the carbon soot attached to the discharge electrode 30 by converting it into carbon dioxide gas or carbon monoxide. Sometimes I do it like this. A dust remover 33 removes dust adhering to the discharge electrode 30, and one end is fixed to the frame 24 and the other end is attached so as to rub against the discharge electrode 30. It should be noted that the pulley groups 26, 27, 28, 29 may have a sufficient sliding action against the discharge electrodes, and in that case, the dust remover 33 may be omitted. . 34 and 35 are pressure rollers that are pressed from the outside of the dust collection electrode 12 wound around each roller 8 and 9, and the dust attached to the inner circumferential surface of the dust collection electrode 12 is prevented from coming into contact with the rollers 8 and 9. The pressing force promotes compression molding into a cake-like shape. 36 and 37 are support shafts 10 and 11 and pressure rollers 34 and 35 in order to keep the pressure rollers 34 and 35 in constant contact with the rollers 8 and 9.
These are springs suspended between the support shafts 38 and 39 of the . Reference numerals 40 and 41 denote a long hole 42 that supports the support shafts 38 and 39 so as to be movable in the left and right direction, and a motor for driving the dust collection electrode connected to the support shaft 10 of one roller 8. Reference numeral 43 represents a motor for driving the discharge electrode. ,
The rotational power is generated by, for example, a chain wheel 44 fixed to the rotating shaft of the motor 43, and a chain wheel fixed to the end of the support shaft 45 installed parallel to the hanger support 13 that protrudes outside the exhaust port 5. A chain wheel 48 is fixed to the end of the support shaft 45 inserted into the exhaust port 5, and a chain 47 is wound between the chain wheel 46 and the pulley 28.
The energy is transmitted to the discharge poles through a transmission mechanism comprising a chain 50 wound around a chain wheel 49 fixed to a supporting shaft of the motor. Note that the mechanism for transmitting the rotational power for driving the electric discharge pole 30 to travel includes a mechanism that allows the electric discharge pole 30 to travel continuously in one direction as described above, as well as a mechanism that engages and disengages a pawl link that reciprocates with a ratchet wheel. In some cases, an intermittent mechanism such as an intermittent mechanism for causing the discharge electrode 30 to travel in one direction intermittently may be employed, and other mechanisms whose designs are appropriately modified may also be employed. Further, the discharge electrode 30 may be driven by the same motor as the dust collection electrode 12. Reference numeral 51 denotes a partition plate provided inside each roller 8, 9 at both ends of the chamber 15, and a dust collecting electrode 12 is provided inside the chamber 15 at the upper or lower end of the partition plate.
A scraper 52 is provided for peeling off dust adhering to the inner circumferential surface of the rollers 8 and 9, which is caked between the rollers 8 and 9, from the dust collection electrode 12 or further from the rollers 8 and 9. 53 is the cake peeled off by the scraper 52 into the casing 1
It is a screw conveyor for transporting the cake to the outside, and on the roller 8 side, it is provided along with a cylindrical cake receiver 54 along with the upper dust collecting electrode.
4 receives the cake so that it can be taken out to the outside from a take-out pipe 55 provided at the same height position, and on the roller 9 side, it is provided along the lower dust collecting electrode and can be taken out from the take-out pipe 55. It's like this.

Next, to explain the operation of the electrostatic precipitator having the above configuration, dust-containing gas is introduced into the casing 1 through the inlet ducts 2 and 3 provided on both sides of the casing 1, and is introduced into the casing 1 at the center of the chamber 15. The gas flows collide with each other and split into left and right sides with uniform air distribution and flow rate, and are discharged from the casing through the exhaust ports 4, 5 and 6, 7. During this time, dust is charged in the electric field formed by the discharge electrode 30 and the dust collection electrode 12 and collected on the inner surface of the belt-shaped dust collection electrode 12 that is being driven. ,7. On the other hand, the dust collected on the dust collection electrode 4 is compressed between the rollers 8 and 9 to form a cake, and each scraper 5
2, and is discharged to the outside from the take-out pipe 55 by each screw conveyor 53.

While purifying the dust-containing gas as described above, if dust adheres to the discharge electrode 30 and becomes enlarged, and the dust collection efficiency decreases, the discharge electrode drive motor 43 is driven to rotate. The electric discharge electrode 30 is driven to travel by the power, and the dust attached to the electric discharge electrode 30 is removed by a dust remover 33, thereby restoring the dust collection efficiency.

Incidentally, the dust collection electrode 12 can be provided in multiple stages by increasing the number of rollers around which it is wound, and the discharge electrode 30 can be provided between each stage, or the discharge electrode 30 and the dust collection electrode 12 can be arranged vertically. When provided in the direction, there is no need to provide the screw conveyor 53, and the peeled cake can be taken out from the take-out pipe 55 by natural fall. Further, the inlet duct provided in the casing 1 may be provided only on one side of the casing 1.

In the above embodiment, an example was shown in which the dust-containing gas was directly introduced into the casing 1, but the casing 1
Dust collection efficiency can be further improved if the dust is pre-charged or the pre-charged dust is pre-agglomerated before being introduced into the air.

Next, to explain the embodiment, as shown in FIG. 56, 57 are provided, and a high voltage is applied to these discharge electrodes 56, 57 so that the dust in the gas passing through the inlet ducts 2, 3 is charged by corona discharge. When the dust pre-charged in this way is led into the chamber 15, most of it is immediately collected on the dust collection electrode 12 without being charged by the discharge electrode 30.
The remaining dust is charged by the discharge electrode 30 and collected by the dust collection electrode 12. The discharge electrodes 56 and 57 may be provided with barbs 58 as shown in the seventh figure, or plate pieces 59 with sharp edges as shown in the eighth figure.
It is possible to adopt various structures that improve discharge efficiency, such as providing a.

FIG. 9 shows an example of pre-agglomeration of pre-charged dust, in which the inlet duct 2 is removably provided on both sides or one side of the casing 1, the rear end is supported by the frame 24, and the tip is sharpened. A thin discharge electrode 60 is provided, and at a position slightly behind the tip of the discharge electrode 60, a positive electrode has an electrode plate 61 to which a high voltage is applied, and an electrode plate 62 to which a negative electrode high voltage is applied. An appropriate number of sheets are supported alternately at intervals in the passing direction. Electrode plates 61, 62
The structure supporting the discharge electrode 60 may be any structure as long as it does not prevent the passage of the dust-containing gas. Most of the dust charged by the corona discharge of the discharge electrode 60 passes between the electrode plates 61 and 62, and if the dust is negatively charged by the Coulomb force due to the electric field between the two electrode plates, 61
If it is negatively charged, it is collected on the electrode plate 61. Since most of the dust that has passed between the electrode plates 61 and 62 without being collected is pre-charged, it is immediately collected by the dust collection electrode 12, and the remaining dust is charged and collected by the discharge electrode 30. The dust is collected on the dust electrode 12.

FIG. 10 shows a modified embodiment of the support mechanism for the discharge electrodes for precharging and the electrodes for precoagulation.
An annular hollow part 63 is provided at the tip of the inlet duct 2 which is removably provided on both sides or one side of the casing 1.
An injection port 64 for injecting the dust-containing gas in an obliquely inward direction is provided inside the hollow part 63, and a passage 6 for introducing the dust-containing gas is provided outside the hollow part 63.
A discharge electrode 67 for preliminary charging is inserted from the inlet duct 2 to a passage 66 formed by the inner diameter of the hollow portion 63, and the rear end of the discharge electrode 67 is supported by the frame 24, and the tip The support beam 6 is supported by insulators 68, 68 at the tip of the hollow part 63.
9, and inside the inlet duct 2 there is an electrode plate 7 similar to the electrode plate for pre-agglomeration shown in FIG.
0.71 is provided. In this structure, since the discharge electrode 67 is supported at both front and rear ends, the discharge electrode 67
7 and electrode plates 70, 71 are stably supported, and the dust-containing gas is discharged from the inlet duct 2 through the injection port 64.
This has the advantage of being able to prevent dust-containing gas from leaking out of the casing 1 from the vent 66 by drawing clean air into the interior of the casing 1 through the vent 66.

In the present invention, as described above, the discharge electrode is provided so that it can travel, and a dust remover is provided in the middle of the travel of the discharge electrode, so that it is possible to prevent the discharge electrode from becoming enlarged due to dust adhesion. It is possible to prevent a decrease in dust collection efficiency when collecting conductive dust as well as conductive dust. In addition, the dust collection efficiency can be further improved by providing a discharge electrode for precharging or a discharge electrode for precharging and an electrode plate for precoagulation inside or near the inlet duct that passes through the casing. can. Moreover, since the circuit of the discharge electrode is insulated and fixed outside the casing, it has excellent insulation properties, and there is almost no deterioration in insulation properties even when collecting conductive dust such as carbon particles. In addition, the dust attached to the dust collection electrode is always compressed between the belt-shaped dust collection electrode and the roller and can be peeled off with a scraper.
Without the problem of dust re-scattering, the dust-collecting electrode always operates in a scraped or wiped state, so that the dust-collecting action is always kept in the best possible condition, unlike in the case of ordinary electrostatic precipitators. This has the advantage that there is no need for hammering or setting the impact value. Furthermore, according to the structure of the present invention, the vertical cross-sectional area and dimensions of the device can be reduced, and the device can be installed in any direction, vertically or horizontally, so problems such as installation space and location can be largely resolved, and many other effects can be achieved. It is.

[Brief explanation of drawings]

Fig. 1 is a sectional view for explaining the principle of the present invention, Fig. 2 is a partially cutaway front view for explaining the principle of the invention, and Fig. 3 is a front view partially enlarging an example of a discharge pole. Figure 4 is a side view of Figure 3, Figure 5 is a partially enlarged front view of another example of the discharge electrode, and Figure 6 is a side view of Figure 3.
The figure is a cross-sectional view when a discharge electrode for pre-charging is provided in the inlet duct, FIG. 7 is a front view showing a modified embodiment of the same discharge pole, and FIG. 8 is another modified embodiment of the same discharge pole. FIG. 9 is a sectional view showing a case in which a discharge electrode for preliminary charging and an electrode for preliminary aggregation are provided in the inlet duct, and FIG. 10 is a sectional view showing a modified embodiment of FIG. 9. 1... Casing, 2, 3... Inlet duct,
4,5,6,7...exhaust port, 12...dust collection electrode, 13,14...hanger support, 15...
Chamber, 16, 17, 18, 19... Insulating stone, 20, 21, 22, 23... Support beam, 2
4, 25...Frame, 26, 27, 28, 29
... Pulley group, 30, 32 ... Discharge pole, 33 ...
Dust remover, 42...Motor for driving dust collection electrode, 43...Motor for driving discharge electrode, 5
6, 57, 60, 67... discharge electrodes for precharging,
61, 62 and 70, 71... Electrode plates for preliminary aggregation.

Claims (1)

[Scope of Claims] 1. An endless belt-shaped dust collecting electrode with a chamber formed inside the casing having an inlet for dust-containing gas and an exhaust port for clean gas and wound so as to be movable, In an electrostatic precipitator having a structure in which an end of a hanger support that supports a discharge electrode frame inserted into the chamber is insulated and supported by protruding to the outside of the casing through the exhaust port or inlet, discharge is caused to the discharge electrode frame. An electrostatic precipitator characterized in that a pole is installed so as to be movable, and a dust remover is provided in the middle of the travel to rub against the discharge electrode. 2. The electrostatic precipitator according to claim 1, wherein a discharge electrode for precharging or a discharge electrode for precharging and an electrode for precoagulation are provided at the inlet of the dust-containing gas. 3. The electrostatic precipitator according to claim 1 or 2, wherein the discharge electrodes installed in the chamber are endless discharge electrodes. 4. An inlet duct is removably attached to the casing, and the inlet duct is provided with a discharge electrode for precharging or a discharge electrode for precharging and an electrode for precoagulation. The electrostatic precipitator according to item 2 or 3.