JP2958735B2 - Smoke exhaust deodorization method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for adsorbing and deodorizing flue gas, which can remove fine particles and odor in flue gas generated in various fields such as various synthetic chemistry and general industries.

[0002]

2. Description of the Related Art In recent years, in order to prevent pollution, it has been required to remove not only the fine particles of dust in the flue gas but also the odor of the flue gas discharged from various industries. Thus, by passing smoke, for example, between a plurality of electrodes with a DC charge of 10,000 volts,
2. Description of the Related Art Electrostatic smoke collection devices that collect fine particles in flue gas are widely used.

[0003] However, particles of relatively large mass of about 5 microns or more, for example, tar of high viscosity in the case of smoke exhaust such as pyrolysis gas, are easily adsorbed on the electrode of this type of electrostatic smoke collector. It is difficult to adsorb a low-viscosity tar having smaller particles to the electrode, and it is also difficult to wash the attached high-viscosity tar. Therefore, tar having a low viscosity of, for example, 0.5 to 0.02 microns is collected by a mist collector.

[0004] Such a mist collector has a very complicated structure formed by laminating a net knitted with a thin metal wire or the like in several layers, has a high porosity, is light in weight, and has a light weight. Since the entire surface of the wire is in contact with the space, there is an advantage that the surface area is very large and the pressure loss is small. However, if the pyrolysis gas is directly passed through such a mist collector without using an electrostatic smoke collector as described above, high-viscosity tar adheres to the mist collector, and is periodically cleaned with a detergent. However, it is difficult to wash the high-viscosity tar.

On the other hand, in a static electricity smoke collection device, when a direct current charge is applied to the electrode, electrolysis occurs, and at the same time, ozone is generated in the electrode and oxidative deodorization by ozone is performed. It does not happen. Furthermore, it is not collected by the mist collector.
For deodorization of flue gas containing fine particles of 2 microns or less, the use of an activated carbon deodorizer or a catalytic heating deodorizer is effective.
These devices have their own limitations in their capabilities.

As described above, the electrostatic smoke collector, the mist collector and the activated carbon deodorizer, or the catalytic heating deodorizer for adsorbing and deodorizing the exhaust gas of the pyrolysis gas include:
There are various problems in performing all the adsorption and deodorization treatments of high-viscosity and low-viscosity tar with one apparatus, each having advantages and disadvantages.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and it has been proposed that the electrostatic smoke collecting device, the mist collector, and the activated carbon deodorizing device or the catalytic heating deodorizing device are appropriately installed. The method and apparatus for effectively collecting traps of high and low viscosity, washing the tar adhered by the collection, and having a high deodorizing effect by using in combination in a proper order. It is intended to provide.

[0008]

In order to achieve the above object, the present invention provides a method for adsorbing and deodorizing flue gas, which comprises introducing a flue gas obtained by collecting high-viscosity tar with an electrostatic smoke collector into a mist collector. The method is characterized in that low-viscosity tar collected by a collector is dropped onto the electrode of the above-mentioned electrostatic smoke collector, and the high-viscosity tar adhering to the electrostatic smoke collector is washed. To collect high-viscosity tar and oxidative deodorization, and to collect low-viscosity tar using a mist collector, and to apply low-viscosity tar collected by the mist collector to the electrode of the electrostatic smoke collector. The electrode is washed by dropping it.

Further, as an apparatus applied to the above-mentioned method for adsorbing and deodorizing flue gas, a mist collector is provided above a static electricity smoke collecting device for passing flue gas from below to above, and low viscosity collected by the mist collector is provided. By dropping the tar on the electrode of the electrostatic smoke collector.
On the other hand, providing a smoke exhaust dispersion plate at least at one or more of the entrance side, the middle part, and the exit side to the mist collector of the electrostatic smoke collector may make the flow of smoke exhaust uniform. Further, it is preferable to provide an activated carbon deodorizing device for introducing the flue gas discharged from the mist collector or a catalyst heating deodorizing device in order to improve the deodorizing effect of the flue gas. .

[0010]

FIG. 1 is a front view of a flue gas adsorbing and deodorizing apparatus according to one embodiment of the present invention, FIG. 2 is a left side view of FIG. 3 is a right side view of FIG. 1, and FIG. 4 is a plan view of FIG. First, at the bottom of the main body frame 1 of the apparatus, there is an inlet 21 for odorous exhaust gas G such as a pyrolysis gas, and the exhaust gas G introduced from the inlet 21 is first, as shown in FIG. As shown in FIG. 6, the flow is made uniform by passing through a first dispersion plate 23 in which large holes 22 are provided at regular intervals, and as shown in FIG. After that, as shown in an enlarged sectional view of a main part of FIG. 7, a plurality of plate-shaped electrodes 6 are passed through a first electrode block 71 in which the electrodes 6 are arranged at equal intervals.

Next, the smoke exhaust G passing through the first electrode block 71 is applied to the third dispersion plate 2 similar to the second dispersion plate 25 shown in FIG.
After being dispersed more evenly at 6, the light passes through a second electrode block 72 composed of electrodes 7 having the same configuration as in FIG. By applying a DC charge of about 10000 volts to each electrode 6 of the electrostatic smoke collecting device 70 composed of the first electrode block 71 and the second electrode block 72, the smoke G is discharged between the electrodes 6.
Passes through, high-viscosity tar having a particle size of about 5 μm or more adheres to the electrode 6 and is collected. Here, the passing speed of the smoke exhaust G through each electrode 6 of the electrostatic smoke collecting device 70 is adjusted by the first dispersion plate 23 and the second dispersion plate 25 on the entrance side and the third dispersion plate 26 in the middle. As a result, mist such as high-viscosity tar is efficiently collected.

The smoke smoke G collected by the electrostatic smoke collecting device 70 composed of the first electrode block 71 and the second electrode block 72 as described above is discharged to the exit side of the electrostatic smoke collecting device 70. Is dispersed by the fourth dispersion plate 27 provided in
Further, by passing through a mist collector 80 composed of a coarse mist collector 81 and a fine mist collector 82 disposed as shown in FIG.
Mist from 0.5 microns to 0.02 microns is collected.

The low-viscosity tar and water droplets, such as spindle oil, collected by the mist collector 80 are mixed with the fourth dispersion plate 2.
7, fall down and fall evenly on the surface of each electrode 6 of the electrostatic smoke collection device 70, and wash the high-viscosity tar adhering to the surface of the electrode 6 with the low-viscosity tar. It falls to the tar tray 90. In this embodiment, the electrode 6 and the mist collector 80 are washed by the fall of the low-viscosity tar and water droplets collected by the mist collector 80, and the frequency of cleaning work of the electrode 7 and the mist collector 80 is extremely low. Has been confirmed by experiments.

Next, the uncollected gaseous particles of 0.02 μm or less in the flue gas G discharged from the mist collector 80 are converted into an activated carbon deodorizer 100 for introducing the flue gas G from the mist collector 80. Alternatively, it is finally collected by a catalyst heating and deodorizing device (not shown), so that the remaining odor can be removed. Here, a temperature sensor 101 is provided at an outlet of the mist collector 80, and water supplied from the water supply device 16 is sprayed by the spray nozzle 19 in accordance with the temperature of the exhaust gas G.

The exhaust gas G passing through the activated carbon deodorizing apparatus 100 is sucked by the blower 12, and the clean gas is discharged from the exhaust port 107 to the atmosphere. In FIG. 1, a control panel 104 is incorporated in the main body base 2, and the activated carbon deodorizing device 100 and the blower 12 are mounted on the main body base 2. On the other hand, when the activated carbon deodorizer 100 cannot remove the remaining odor in the flue gas G, fresh air can be taken in through the dilution air intake 106 in FIG. 4 to reduce the odor.

[0016]

According to the method and apparatus for exhaust gas intake deodorization of the present invention described above, it is possible to remove dust and deodorize most exhaust gas. For example, even in the case of exhaust gas mixed with steam, cooling air is mixed in to remove steam. It can be condensed into water droplets, collected by a mist collector, and dropped on the electrode surface to improve the cleaning effect.

Further, even in the case of exhaust gas containing dust, the dust is collected by the electrostatic smoke collecting device and does not reach the mist collector, and there is no contamination of the mist collector at all. As described above, according to the present invention, the collection of high- and low-viscosity tar is effectively performed by the electrostatic smoke collector and the mist collector,
Further, the tar adhered by the collection is immediately washed, and the frequency of the washing operation can be reduced. Also, the odor in the smoke exhaust can be removed by oxidative deodorization when ozone is generated in the electrodes of the electrostatic smoke collector, and the remaining odor can be removed by an activated carbon deodorizer or the like.

[Brief description of the drawings]

FIG. 1 is a front view of a flue gas adsorption and deodorization apparatus according to one embodiment of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is a plan view of FIG. 1;

FIG. 5 is a plan view of the first dispersion plate of FIG. 2;

FIG. 6 is a plan view of second and third dispersion plates of FIG. 2;

FIG. 7 is an enlarged sectional view of a main part of an electrode indicated by an arrow A in FIG. 2;

FIG. 8 is an enlarged side view of a main part of the mist collector shown by an arrow B in FIG.

[Explanation of symbols]

Reference Signs 6 electrode 23 first dispersion plate 25 second dispersion plate 26 third dispersion plate 27 fourth dispersion plate 70 electrostatic smoke collector 80 mist collector 100 activated carbon deodorizer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B03C 3/02 B01D 53/34 116B 116H 3/155 53/36 ZABH 3/78

Claims (4)

(57) [Claims] 1. A high-viscosity tar collected by an electrostatic smoke collector is introduced into a mist collector, and the low-viscosity tar collected by the mist collector is dropped onto an electrode of the electrostatic smoke collector. Smoke exhaust adsorption and deodorization method for washing high viscosity tar adhering to the electrostatic smoke collector. 2. A mist collector is disposed above a static electricity smoke collector that allows smoke to pass upward from below, and low-viscosity tar collected by the mist collector is dropped onto an electrode of the static electricity smoke collector. A flue gas adsorption and deodorizing device. 3. At least one of an entrance side, an intermediate section, and an exit side to a mist collector of the electrostatic smoke collector,
3. The flue gas adsorption and deodorizing device according to claim 2, further comprising a flue gas dispersion plate. 4. A flue gas adsorbing and deodorizing device in which flue gas discharged from the mist collector according to claim 2 is passed through an activated carbon deodorizing device or a catalytic heating deodorizing device.