JPH0824559A - Rotating disk discharge type waste gas treating device - Google Patents

Abstract

PURPOSE:To provide a compact waste gas treating device which works normally even at sliding state and does not take much time for maintenance. CONSTITUTION:This device is a waste gas treating device consisting of a cooling mechanism and a purifying mechanism. In the purifying mechanism, rotating disks 19 are attached at regular intervals on a rotary shaft 9 so that a lower part is immersed in a seawater basin 21, and a discharge electrodes 20 are disposed between the disks. A layer of seawater is formed on the surface of the rotating disks 19 by a rotation of the rotary shaft 9 and discharge is generated between the rotating disk 19 and the discharge electrode 20, and a waste gas component is decomposed and absorbed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary disk discharge type exhaust gas treatment device for purifying exhaust gas such as diesel engine exhaust gas.

[0002]

Another BACKGROUND OF THE INVENTION AND SUMMARY OF THE INVENTION harmful gases such as SO _2, NO _x is in the diesel engine exhaust gas, includes a dust and soot and the like, into the atmosphere due to environmental It is known to remove these toxic gases, dust, soot, etc. by dissolving with water, decomposing with pulse discharge, electrostatic adsorption, etc. before discharging.
For example, the exhaust gas to be treated is sent from the lower part of the tower to the upper part, the water ejected from the nozzle is dropped on the exhaust gas from the upper part to remove dust and soot, and the exhaust gas sent to the upper part is subjected to discharge treatment. A device for decomposing harmful gas has been developed. However, such devices require vertical space from their mechanism. Although it may be used in a stationary state, when it is used on a ship, for example, the jetted water may not uniformly fall on the exhaust gas rising due to the rocking of the ship. Further, there is a problem in maintenance that the nozzle clogging that occurs relatively frequently is eliminated.

SUMMARY OF THE INVENTION The present invention is intended to solve such a problem, and provides a compact exhaust gas treating apparatus which functions normally even in a rocking state and does not require maintenance.

[0004]

That is, the present invention is based on the first aspect.
And (a) at least a part of the lower part thereof is soaked in the cleaning liquid and one or more rotating disks that rotate about a support shaft arranged substantially horizontally on the surface of the cleaning liquid, (b) around this rotating disk. One or more discharge electrodes forming a discharge state; and (c) a chamber in which the cleaning liquid is stored and a chamber in which the rotating disk and the discharge electrodes are housed so as to come into contact with exhaust gas to be introduced, The present invention relates to a rotary disk discharge type exhaust gas treatment device, wherein a film of the cleaning liquid is formed on the surface of the rotary disk by the rotation of the rotary disk.

Secondly, according to the present invention, (a) at least the outer peripheral portion is filled with the contact area increasing material, and at least the contact area increasing material at the lower part is substantially immersed in the cooling liquid surface. A cylindrical body that rotates around a horizontally arranged support shaft; and a chamber that stores the cooling liquid and that houses the cylindrical body so as to come into contact with the high-temperature exhaust gas into which the contact area increasing material is introduced. A cooling mechanism in which a film of the cooling liquid is formed on the surface of the contact area increasing member by the rotation of the cylindrical body, and (b) at least a part of the lower portion is immersed in the cleaning liquid and is substantially horizontal to the cleaning liquid surface. One or two or more rotating discs that rotate around a support shaft arranged in, and one or two or more discharge electrodes that form a discharge state around this rotating disc, and the purification liquid is stored and the cooling is performed. From the mechanism A cleaning mechanism is provided, which is provided with a chamber in which the rotating disk and the discharge electrode are housed so as to come into contact with a gas to be discharged, and a cleaning mechanism which forms a film of the cleaning liquid on the surface of the rotating disk by the rotation of the rotating disk. The present invention relates to a rotary disk discharge type exhaust gas treatment device characterized by:

[0006]

According to the rotary disk discharge type exhaust gas treatment apparatus of the present invention having the above-mentioned first feature, the rotary disk immersed in the cleaning liquid capable of dissolving or absorbing dust or soot is rotated to rotate. A film of the cleaning liquid is formed on the surface of the rotating disk. Therefore, even if this rotary disk discharge type exhaust gas treatment device shakes, the contact between the cleaning liquid and the rotary disk is not hindered, and the film of the cleaning liquid is always formed on the surface of the rotary disk, and the removal of dust and soot is always good. No maintenance required. Further, since the rotary disc is immersed in the cleaning liquid, the cleaning liquid and the rotary disc are accommodated in a narrow area, and it can be said that the rotary disk discharge type exhaust gas treatment device is compact. When a discharge state is formed by the discharge electrode in this device, harmful components of the exhaust gas react to become harmless or become a substance that is easily dissolved in the purification liquid.

In the rotary disc discharge type exhaust gas treatment apparatus of the present invention, by alternately arranging a plurality of rotary discs and a plurality of discharge electrodes, the harmful components of the exhaust gas are efficiently reacted, and dust in the cleaning liquid is removed. The dissolution efficiency of soot is also improved. If at least a part of this discharge electrode is formed of a creeping electrode, the discharge state will spread evenly over a wider range, and the harmful components of the exhaust gas will easily react. Further, the rotating disk may be a flat plate, but when the rotating disk is used as an electrode, if it is made of a punch plate or a wire net, discharge from the discharge electrode is likely to occur. Furthermore, when using this device in a ship, it is very convenient to use seawater as the cleaning liquid.

Further, in the rotary disk discharge type exhaust gas treating apparatus of the present invention having the above-mentioned second characteristic, the cooling mechanism is connected upstream of the purifying mechanism similar to the rotary disk discharge type exhaust gas treating apparatus described above. It is used when exhaust gas impairs the purification mechanism at high temperature. According to this cooling mechanism, the cooling liquid film is always formed on the surface of the contact area increasing material filled in the rotating cylindrical body, and the high temperature exhaust gas comes into contact with the cooling liquid film. Heat exchange occurs and the temperature of the hot exhaust gas drops. On the contrary, the heated cooling liquid film is returned to the cooling liquid reservoir in the chamber by the rotation of the cylindrical body, and the cooling liquid film capable of exchanging heat with the hot exhaust gas is formed again on the surface of the contact area increasing material. The exhaust gas is continuously cooled. During this heat exchange, exhaust gas components such as dust and soot may be dissolved in the cooling liquid and removed from the exhaust gas.

The rotary drive of the purifying mechanism and the rotary drive of the cooling mechanism of this rotary disk discharge type exhaust gas treatment apparatus may be independent, but it is economical and coaxial if they are rotated by the same drive system. Becomes compact. Further, when this rotary disk discharge type exhaust gas treatment device is used in a ship, it is convenient to use not only the purification liquid but also the cooling liquid as seawater.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the rotary disk discharge type exhaust gas treatment apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a rotary disk discharge type exhaust gas treatment apparatus 1 according to an embodiment of the present invention. This rotary disc discharge type exhaust gas treatment apparatus 1 comprises a cooling mechanism 2 and a purification mechanism 3 (the rotary disc discharge type exhaust gas treatment apparatus of the present invention).

In the rotary disk discharge type exhaust gas treatment apparatus 1, for example, high temperature exhaust gas of a diesel engine is introduced from the gas introduction section 4 into the cooling mechanism 2 to cool and wash the exhaust gas. The cooled and washed exhaust gas is sent from the cooling mechanism 2 to the purification mechanism 3 through the duct 5. The cooling-cleaned exhaust gas is subjected to discharge treatment by a pulse current supplied by being insulated by the insulator 6 in the purifying mechanism 3 to remove its harmful components. The exhaust gas from which the harmful components have been removed is discharged through the duct 7.

In the operation of the cooling mechanism 2 and the purification mechanism 3 of the rotary disk discharge type exhaust gas treatment apparatus 1 described later, one motor 8 is used as a drive source and is connected to the motor 8 via a chain and a sprocket, for example. The rotation is performed by rotating the rotating shaft 9. Since one motor is used as a drive source in this manner, this rotary disk discharge type exhaust gas treatment apparatus 1
Is energetically economical.

A sectional view of the cooling mechanism 2 is shown in FIG. FIG. 2A is a cross-sectional view taken along the line AA of FIG. 1 in the vertical direction. Further, FIG. 2 (b) is B of FIG. 2 (a).
It is a -B line sectional view.

As shown in FIGS. 2A and 2B, in the cooling mechanism 2, a cylindrical body 10 coaxial with the rotating shaft 9 is attached to the rotating shaft 9. The outer peripheral portion of the cylindrical body 10 is filled with a Raschig ring (the shape is not limited) 11 that is a contact area increasing material, and the central portion 12 is hollow. The outer peripheral surface 13 and the inner peripheral surface 14 of the cylindrical body 10 holding the Raschig ring 11 are made of a material through which gas can pass, but the side surface 15 is a partition wall through which gas cannot pass.

Chamber 16 which constitutes this cooling mechanism 2
A cooling liquid reservoir 17 in which a cooling liquid is stored is provided in the lower part of the. This coolant is not limited, but when used on ships,
Seawater is convenient. A part (lower part) of the Raschig ring 11 with which the cylindrical body 10 is filled is always immersed in the cooling liquid reservoir 17.

In this cooling mechanism 2, high-temperature exhaust gas is introduced from the gas introduction section 4 as described above. The introduced high-temperature exhaust gas passes through the center portion 12 of the hollow cylindrical body 10 as shown by the arrow in FIG. 2 and passes through the Raschig ring 11 filled in the cylindrical body 10 from the inner peripheral surface 14 to the outer peripheral surface 13.
Pass towards. From a finer point of view, this exhaust gas is in contact with the filled Raschig ring 11 while being in contact with the cylindrical body 1.
It can pass in any direction up / down, left / right, or front / back within 0. Further, since the cylindrical body 10 is rotating around the rotating shaft 9,
A cooling liquid film is formed on the surface of the Raschig ring 11 having a large contact area by being immersed in the cooling liquid reservoir 17, and the cooling liquid drips from the Raschig ring 11. Therefore, when the high-temperature exhaust gas passes through the filled Raschig ring, it is sufficiently contacted with the coating film of the cooling liquid and is exposed to the dripping cooling liquid to be cooled (the cooling liquid is heated) and the exhaust gas is discharged. Soot, dust and other easily dissolved gas components therein are absorbed by the coolant. In this way, the Raschig ring 11 having a cooling liquid coating film contaminated with soot, dust, etc. is immersed in the cooling liquid reservoir 17 below the chamber 16 again by the rotation of the cylindrical body 10 to be washed, and the surface of the Raschig ring 11 is again heated cleanly. A film of cooling liquid not formed is formed. The degree to which the cooling liquid film is formed and the degree to which the cooling liquid drips can be controlled by adjusting the rotation speed of the rotating shaft 9. In addition, the cooled exhaust gas from which at least a part of soot and dust has been removed is sent to the purification mechanism 3 through the duct 5 described above.

Since the cooling mechanism 2 has a function of cleaning soot and dust as well as cooling as described above, not only the upstream side of the purification mechanism 3 but also the downstream side of the purification mechanism 3 as shown in FIG. It may be added to the side.

The purifying operation of the cooled exhaust gas sent to the purifying mechanism 3 as described above is shown in the sectional view of FIG.
3A is a cross-sectional view of a plane cut in the vertical direction similarly to FIG. 2A, and FIG. 3B is a cross-sectional view taken along line CC of FIG. 3A.

As shown in the figure, in the purifying mechanism 3, a plurality of rotating disks 19 are attached to the rotating shaft 9 at regular intervals, and a plurality of fan-shaped discharge electrodes 20 are fixed between the rotating disks 19. It is arranged at intervals. A current is applied to each discharge electrode 20 from the main electrode 22 provided on the top of the chamber 18 via the insulator 6. Then, the rotating disk 19 is usually set to the negative electrode. This current is a pulse current, and it is preferable that pulse discharge is performed from the discharge electrode 20. During discharge, the discharge part is in the cold plasma region, and the exhaust gas components are activated and easily react in this region.

The lower part of the rotating disk 19 is always immersed in the cleaning liquid reservoir 21 in the lower part of the chamber 18 in which the cleaning liquid is stored, and the rotating disk 1 is rotated by the rotation of the rotating shaft 9.
A film of the cleaning liquid is formed on the entire surface of 9. The degree of formation of this coating can be controlled by adjusting the rotation speed of the rotating shaft 9. Further, this purifying solution is not particularly limited, but is conveniently seawater for use on a ship.

In this purifying mechanism 3, the cooled exhaust gas sent from the duct 5 is discharged between the rotating disk 19 and the discharge electrode 20, and between the discharge electrode 20 and the rotating disk 19.
Pass around. Components of the exhaust gas that are easily dissolved in the cleaning liquid, such as dust and soot, are absorbed by the cleaning liquid film on the surface of the rotating disk 19, and harmful components such as nitrogen oxides that are difficult to dissolve in the cleaning liquid are reacted by the discharge from the discharge electrode 20. Then, it is rendered harmless or becomes a substance that is easily dissolved in the cleaning liquid and is absorbed by the cleaning liquid film. Then, the exhaust gas from which harmful components, dust, soot, etc. have been removed is discharged through the duct 7.

In order to improve the purification performance of the purification mechanism 3 as described above, the number of rotating disks 19 and the discharge electrodes 20 is increased, or partition walls are provided in the chamber 18 of the purification mechanism 3 to lengthen the path through which exhaust gas passes. Exhaust gas and rotating disk 19
Also, the contact time and contact area with the discharge electrode 20 can be increased. Further, the number of rotating disks 19 can be increased or decreased according to the amount of exhaust gas to be processed and the type of the exhaust gas.

As described above, in the rotary disc discharge type exhaust gas treatment apparatus 1, since the Raschig ring 11 and the rotary disc 19 are always sufficiently immersed in the cooling liquid reservoir 17 and the purification liquid reservoir 21, respectively, there is no influence of shaking. Since the Raschig ring 11 and the rotary disk 19 are always coated with a cooling liquid and a cleaning liquid, good and safe exhaust gas treatment is always performed. Further, since the treatment efficiency is excellent, it is economical and safe because seawater can be used without using a special chemical as a cleaning liquid.

In the above embodiment, the cooling mechanism 2 is particularly required when the exhaust gas has a high temperature and contains a large amount of soot.
Otherwise, the exhaust gas can be treated only by the purifying mechanism 3 (rotary disk discharge type exhaust gas treatment device). Also,
In the present invention, the drive of the cooling mechanism 2 and the drive of the purification mechanism 3 may be performed by different drive motors.

Further, in the above embodiment, it is preferable that a part of the discharge electrode 20 is a creeping electrode using a dielectric (that is, a superposition circuit is formed). This is because the discharge area is increased and the discharge is uniformly generated around the discharge electrode 20. Also when the creeping electrode is used, the rotating disk 19 may serve as the negative electrode. As a result, a discharge is generated on the surface of the creeping electrode and a discharge from the discharge electrode 20 including the creeping electrode to the rotating disk 19 occurs, so that the harmful components of the exhaust gas react more effectively.

In the cooling mechanism 2 and the purification mechanism 3, a supply pump for supplying the cooling liquid and the purification liquid, and a mechanism for discharging the dirty cooling liquid and the purification liquid can be provided. An overflow or the like can be used as the discharging mechanism. The overflow portion is preferably provided in a portion that is not affected by the inclination of the device, for example, the rotating shaft 9
Is provided near the Especially when used on ships,
Dirty cooling liquid and purification liquid (seawater) can be discharged directly into the sea.

In the rotary disk discharge type exhaust gas treating apparatus 1, since the temperature of the exhaust gas sent to the purifying mechanism 3 is preferably 250 ° C. or lower, the cooling mechanism 2 has a function of cooling the high temperature exhaust gas to 250 ° C. or lower. It is required to prepare.

When an alkaline liquid is used as the purifying liquid in the above-mentioned embodiment, nitric oxide in the exhaust gas is oxidized by discharge to form nitrogen dioxide, which reacts with the alkaline liquid to form nitric acid and is absorbed by the alkaline liquid. According to the apparatus of the present invention, in addition to diesel engine exhaust gas, boiler and waste incinerator combustion exhaust gas, overtime exhaust gas having a bad odor, and the like are purified.

[0030]

According to the rotary disk discharge type exhaust gas treatment apparatus of the present invention, dust and soot are always removed well even in the rocking state, and maintenance is not required, and the apparatus is compact. In this apparatus of the present invention, if a plurality of rotating disks and a plurality of discharge electrodes are alternately arranged, the reaction of harmful components of exhaust gas is efficiently performed, and the efficiency of dissolving dust or soot in the cleaning liquid is also improved. If a creeping electrode is used as the discharge electrode, the discharge state will spread evenly over a wider area and the harmful components of the exhaust gas will easily react. Further, the rotating disk can be made of a punch plate or a wire net to improve the discharge efficiency. Further, according to the rotary disk discharge type exhaust gas treatment apparatus of the present invention including the cooling mechanism, high temperature exhaust gas can be treated without any problem. Further, if the purifying liquid and the cooling liquid are seawater, it is convenient for use in ships.

[Brief description of drawings]

FIG. 1 is a perspective view of a rotary disk discharge type exhaust gas treatment apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a cooling mechanism.

FIG. 3 is a diagram showing a purification mechanism (rotary disk discharge type exhaust gas treatment device).

[Explanation of symbols]

 1 Rotary Disc Discharge Type Exhaust Gas Treatment Device 2 Cooling Mechanism 3 Purification Mechanism 10 Cylindrical Body 11 Raschig Ring (Contact Area Increasing Material) 16, 18 Chamber 17 Cooling Liquid 19 Rotating Disc 20 Discharge Electrode 21 Purification Liquid

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B01D 53/77 ZAB 53/50 53/56 53/74 B01D 53/34 129 C

Claims (11)

[Claims] 1. (a) One or more rotating discs, at least a part of the lower part of which is submerged in the cleaning liquid and which rotates about a support shaft arranged substantially horizontally on the surface of the cleaning liquid, (b) this rotating disc. One or more discharge electrodes that form a discharge state around, and (c) a chamber for accommodating the cleaning liquid and for accommodating the rotating disk and the discharge electrode so as to come into contact with the introduced exhaust gas. A rotary disk discharge type exhaust gas treatment apparatus, comprising a film of the cleaning liquid formed on a surface of the rotary disk by rotation of the rotary disk. 2. The rotary disk discharge type exhaust gas treatment apparatus according to claim 1, wherein a plurality of the rotary disks and a plurality of the discharge electrodes are alternately arranged. 3. The rotary disk discharge type exhaust gas treatment apparatus according to claim 1, wherein at least a part of the discharge electrode is composed of a creeping discharge electrode. 4. The rotary disk discharge type exhaust gas treatment apparatus according to claim 1, wherein the rotary disk is composed of a flat plate, a punch plate, or a wire mesh. 5. The rotary disk discharge type exhaust gas treatment apparatus according to claim 1, wherein the purification liquid is seawater. 6. (a) A support shaft, which is filled at least in the outer peripheral portion with a contact area increasing material, and which is arranged substantially horizontally on the cooling liquid surface so that the contact area increasing material at least in the lower part is immersed in the cooling liquid. A rotation of the cylindrical body is provided, which includes a cylindrical body that rotates in the center and a chamber that stores the cooling liquid and that accommodates the cylindrical body so as to come into contact with high-temperature exhaust gas into which the contact area increasing material is introduced. A cooling mechanism in which a film of the cooling liquid is formed on the surface of the contact area increasing material by (4), and (b) at least a part of the lower part is immersed in the cleaning liquid and the support shaft is arranged substantially horizontally on the surface of the cleaning liquid. One or more rotating discs that rotate around, and one or more discharge electrodes that form a discharge state around the rotating discs, and the cleaning liquid is stored and contacts the gas discharged from the cooling mechanism. Do And a chamber for accommodating the discharge electrode, wherein the rotating disc is provided with a purifying mechanism for forming a coating film of the cleaning liquid on the surface of the rotating disc. Electric discharge type exhaust gas treatment equipment. 7. The rotary disk discharge type exhaust gas treatment apparatus according to claim 6, wherein the cylindrical body and the rotary disk are coaxially driven by one drive system. 8. The rotary disk discharge type exhaust gas treatment apparatus according to claim 6, wherein a plurality of the rotary disks and a plurality of the discharge electrodes are alternately arranged. 9. The discharge electrode according to claim 6, wherein at least a part of the discharge electrode comprises a creeping discharge electrode.
The rotary disk discharge type exhaust gas treatment device according to any one of 1. 10. The rotating disk is formed of a flat plate, a punch plate, or a wire mesh.
The rotary disk discharge type exhaust gas treatment device according to any one of 1. 11. The rotary disk discharge type exhaust gas treatment apparatus according to claim 6, wherein the cooling liquid and the cleaning liquid are both seawater.