JP2001129431A - Stack gas treating device of incinerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actively neutralize a positive ion at discharge electrode and to actively head a negative ion toward a dust collecting electrode by making the particles in stack gas easily electrify at the discharge electrode and also to impart deodorizing function to the subject device by absorbing malodorous particulates at the inner surface of the dust collecting electrode to remove malodor, moreover to absorb the black smoke low in electrical resistance to liquid and to make the smoke to flow down before the rescattering by lossing electric charge to easily recover the black smoke in a stack gas treating device of an incinerator. SOLUTION: An electrical dust collecting means in which a cylindrical dust collecting electrode for passing the stack gas is provided is erected and the discharge electrode is provided in the dust collecting electrode and electric power is supplied between the dust collecting electrode and the discharge electrode, and a material removing means is provided for continuously flowing down the liquid at the inner surface of the dust collecting electrode, and a dust collection accelerating part is provided at the discharge electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flue gas treatment device for an incinerator, and more particularly to a flue gas treatment device for an incinerator for removing substances contained in the smoke.

[0002]

2. Description of the Related Art In an incinerator, smoke is discharged by incinerating waste. Since this smoke exhaust contains many substances such as black smoke (soot), measures for treating the substances are taken.

[0003] As a measure for treating this substance, there is, for example, an electric dust collector. In this electrostatic precipitator, a non-uniform electric field is created by applying a high DC voltage between the positive (+) precipitating electrode and the negative (-) discharge electrode, thereby causing a corona discharge, When the positive ions are neutralized by the discharge electrode, the negative ions travel toward the dust collection electrode, and when smoke is passed through this uneven electric field,
Black smoke as particles mainly obtains a negative charge to become a negative electric body, and is attracted to the dust collection electrode by Coulomb force to be collected.

[0004]

However, since black smoke has a low electrical resistivity, it enters a region where re-scattering occurs in the relationship between the apparent electrical resistivity and the dust collection rate. Bad, it was difficult to collect black smoke.

[0005]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention provides an incinerator for incineration of waste, and the exhaust gas from the incinerator to a flue is provided. In a flue gas treatment device of an incinerator for removing substances, a cylindrical dust collecting electrode for evacuation of smoke is set up, a discharge electrode is provided in the dust collection electrode, and between the dust collection electrode and the discharge electrode. An electric dust collecting means for supplying an electric force is provided, a substance removing means for continuously flowing liquid on the inner surface of the dust collecting electrode is provided, and a dust collecting promoting part is provided at the discharge electrode.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, when a DC high voltage is applied as an electric force between a dust collecting electrode and a discharge electrode, an uneven electric field is created between the dust collecting electrode and the discharge electrode, thereby producing a corona. Discharge occurs, and positive ions are neutralized by the discharge electrode, negative ions travel toward the collection electrode, and when smoke passes through this uneven electric field, black smoke as particles removes negative charges. As a result, it becomes a negative-electrode body and is attracted to the dust collecting electrode by Coulomb force.At this time, due to the presence of the discharge electrode provided with the dust collection promoting portion, the particles in the smoke discharge become easily charged to the discharge electrode. Therefore, positive ions are positively neutralized by the discharge electrode, negative ions are positively directed to the dust collection electrode, and odor fine particles are also adsorbed on the inner surface of the dust collection electrode and have a deodorizing effect. To remove the odor, and the fluid is continuously supplied to the inner surface of the Since the film is made, since has been flowing down the absorption liquid before low smoke electrical resistivity is scattered again loses charge, it is possible to easily perform the recovery of the black smoke.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; 1 and 2 show an embodiment of the present invention. In FIG. 2, reference numeral 2 denotes an incinerator for incineration of wastes, and reference numeral 4 denotes a flue gas treatment device for removing substances in flue gas guided from the incinerator 2 to a flue.

[0008] One end of a first flue gas pipe 6 forming a flue is connected to the incinerator 2. In the middle of the first smoke exhaust pipe 6, a first chimney pipe 8 stands upright. Above the first chimney tube 8, a first safety valve 10 is provided.

The other end of the first flue gas pipe 6 is connected to the first combustion removing means 12. A first burner 16 is attached to one end of the first housing 14, and one end of a second flue gas pipe 18 is connected to the other end of the first housing 14. I have. The first combustion removing means 12 burns the flue gas from the first flue gas pipe 6 in the first combustion chamber (not shown) by the first burner 16, and removes the high temperature flue gas to the first ceramic filter. (Not shown), the residence time is ensured for a fixed time (for example, 2 seconds) or more, and the substances in the smoke exhaust are heated and incinerated using the first ceramic filter as a heat medium.

The other end of the second smoke exhaust pipe 18 is connected to one side of a second housing 22 of the second combustion removing means 20. The second combustion removal means 20 includes a second housing 2
A second burner 24 is attached to one end of the second housing 22, and a second chimney tube 26 is attached to the other end of the second housing 22.
Is erected. Above the second chimney pipe 26, a second safety valve 28 is provided.
0 is connected to one end. The second combustion removing means 20 includes:
The flue gas from the second flue gas pipe 26 is burned by a second burner 24 in a second combustion chamber (not shown), and the hot flue gas is retained by a second ceramic filter (not shown). The time is secured for a certain time (for example, 2 seconds) or more,
The substance in the flue gas is further heated and incinerated using the second ceramic filter as a heat medium.

The first combustion removing means 12 and the second combustion removing means 20 are connected to a combustion side control panel 32 for controlling the operation of the first and second burners 16, 24. Further, a fuel pump 36 provided in a fuel tank 34 is connected to the combustion side control panel 32 so as to supply fuel to the first and second burners 16 and 24.

The other end of the third flue gas pipe 30 is connected to a lower portion of the cooler 40 of the flue gas cooling means 38 for lowering the temperature of the flue gas (for example, about 250 ° C.). Water in a water tank 42 is supplied to the cooler 40 from a water supply passage 46 by driving a water pump 44. In the cooler 40, water heated to a high temperature by absorbing the heat of the flue gas is supplied to the water tank 4.
A water return passage 48 returning to the second side is connected. A radiator core 50 that cools high-temperature water with the cooler 40 and returns the water to the water tank 42 is provided in the middle of the water return passage 48. The water pump 44 is in communication with the control panel 32.

The upper part of the cooler 40 is provided with a fourth flue gas pipe 52.
Are connected at one end. The other end of the fourth smoke exhaust pipe 52 is connected to a blower 54.

One end of a fifth flue gas pipe 56 is connected to the blower 54. The other end of the fifth flue gas pipe 56
It is connected to a substance removing means 58.

In the material removing means 58, a housing-shaped base 60 to which the other end of the fifth flue gas pipe 56 is connected.
In addition, on the upper part of the base 60, for example, first to fifth positive (+) dust collecting electrodes 62-1 to 62-5 having a cylindrical shape are provided.
Are erected in parallel via cylindrical first to fifth holders 64-1 to 64-5.

As shown in FIG. 1, a lower chamber 68 and an upper chamber 70 are formed in a base 60 by a partition 66. The lower chamber 68 and the upper chamber 70 are connected by an opening 72 formed in the partition 66. Lower chamber 68 of base 60
A cooling fan 74 is attached to the side.

On the outer peripheral surface of the upper part of each dust collecting electrode 62, each upper enclosure 78 forming a liquid storage space 76 that opens upward in cooperation with the outer peripheral surface of each dust collecting electrode 62 is mounted. I have. The liquid in the liquid tank 80 is supplied to the liquid storage space 76 from the liquid supply passage 82 by the liquid pump 84. The fluid in the liquid storage space 76 passes over the upper surface of the dust collecting electrode 62 and flows down to the inner surface of the dust collecting electrode 62.

Below each dust collecting electrode 62, each liquid drop passage 88 is formed by being attached to each holding body 64 and cooperating with the inner surface of the lower part of each dust collecting electrode 62 and the inner surface of each holding body 64. Each of the lower enclosures 90 is provided.

Between each liquid drop passage 88 and the liquid tank 80, each downstream branch passage 92 communicating with each liquid drop passage 88 is provided.
And the liquid recovery passage 94 communicates with it. The liquid collecting passage 94 is provided with a filter 96 for removing black smoke in the liquid from each liquid falling passage 88. The filter 96 is, for example, a filter containing activated carbon.

An upper fixing member 98 is provided horizontally on the outer peripheral surface of the upper part of the dust collecting electrode 62. A plurality of cover support members 100 are erected on the upper fixing member 98. A conductive cover member 102 is provided horizontally above the dust collecting electrode 62 above the cover support member 100.

In each of the dust collecting poles 62, as a dust collecting promoting part,
For example, negative (-) discharge electrodes 106 provided with the brush members 104 are respectively provided. The brush member 104 is provided from the upper part of the discharge electrode 106 to a little lower than the central part. The discharge electrode 106 is vertically oriented, one end of which is fixed to the cover member 100, the central portion of which passes through the dust collecting electrode 62, and the other end of which extends into the base 60. The other end of the discharge electrode 106 is
08 and the lower fixing member 112 via the spring 110
It is supported by. The lower fixing member 112 is provided in the lower chamber 6.
In 8, it is fixed to the bottom surface of the base 60. Communication member 10
An umbrella member 114 is provided on the upper part of the reference numeral 8. In addition, an opening forming member 116 is provided in the opening 72 of the partition 66 corresponding to the umbrella member 114.

Further, the cover member 10 is attached to the discharge electrode 106.
2 and a high-voltage generator 122 of the electric dust collecting means 120 for supplying a DC high voltage as an electric force via the first electric wire 118-1.
Contact The high-pressure generator 122 is operated by the removal-side control panel 124. High pressure generator 1
22 is connected to the dust collector 62 via the second electric wire 118-2. The removal side control panel 124 includes a liquid pump 84
Contact

Next, the operation of this embodiment will be described.

The flue gas from the incinerator 2 is introduced from the first flue gas pipe 6 into the first combustion chamber, and is recombusted by driving the first burner 16 to a high temperature (for example, 850 ° C. or higher). . Then, due to the presence of the first ceramic filter, the residence time of this high-temperature flue gas is a certain time (for example, 2 hours).
Sec) or more, the substance is heated and incinerated using the first ceramic filter as a heat medium, and flows out to the second flue gas pipe 18.

Then, the smoke exhausted from the second smoke exhaust pipe 18 is introduced into the second combustion chamber, and is recombusted by driving the second burner to become high in temperature. Then, due to the presence of the second ceramic filter, the residence time of the high-temperature smoke exhaust gas is ensured for a certain time (for example, 2 seconds) or more, and the substance is heated and incinerated again using the second ceramic filter as a heat medium, and the second chimney It flows down to the pipe 26 and the third flue gas pipe 30.

The flue gas from the third flue gas pipe 30 is cooled by the flue gas cooling means 38 and reaches the substance removing means 58 via the blower 54.

In the substance removing means 58,
The smoke discharged to the upper chamber 70 of the base 60 moves upward in the dust collecting electrode 62. At this time, when a high DC voltage is applied between the dust collection electrode 62 and the discharge electrode 106 by the high voltage generation unit 122,
An unequal electric field is created between the collection electrode 62 and the discharge electrode 106, thereby causing a corona discharge, and positive ions are neutralized by the discharge electrode 106, and negative ions are formed on the inner surface of the collection electrode 62. When the vehicle travels in the direction of the non-uniform electric field and smoke passes, the black smoke as particles obtains a negative charge and becomes a negative body, and is attracted to the dust collecting electrode 62 by Coulomb force. The presence of the discharge electrode 106 provided with the brush member 104 as a dust promoting unit makes it easy for the particles in the smoke exhaust to be easily charged on the discharge electrode 106. It is neutralized and positively moves negative ions to the dust collection electrode 62, and since odor particles are also adsorbed on the inner surface of the dust collection electrode 62 and has a deodorizing effect, the odor is removed. The liquid is applied to the inner surface of 62 by the substance removing means 58. Because of the continuous supply of liquid film, black smoke with low electrical resistivity is absorbed by the liquid before it loses charge and re-sprays, and flows down. Since the liquid contains fine particles containing dioxin, it is possible to easily recover black smoke and substances contained in black smoke.

Then, while the black smoke in the liquid recovery passage 94 is removed by the filter 96, only the purified liquid is returned to the liquid tank 80, and this liquid is reused.

As a result, by providing the brush member 104 as a dust collection promoting member in the discharge electrode 106, the action of removing substances in the smoke is improved, and the deodorizing action and the combination with the filter 96 containing activated carbon are improved. The deodorizing effect can be improved, and the liquid can be reused, which is economically advantageous.

The present invention is not limited to the above-described embodiment, and it is needless to say that various applications and modifications are possible.

For example, as shown in FIG. 3, a spiral portion 132 is formed on the discharge electrode 106 as a dust collection promoting portion, or as shown in FIG. 4, a spiral member 134 is formed on the discharge electrode 106 as a dust collection promoting portion. By providing, the particle discharge electrode 10
6 can be improved in charge state, and the ability to remove substances can be improved.

Further, the substance removing means 58 can be incorporated in an air purifier and used as a deodorizing air purifier.

[0033]

As is apparent from the above detailed description, according to the present invention, a cylindrical dust collection electrode for allowing smoke to pass therethrough is erected, and a discharge electrode is provided in the dust collection electrode. By providing an electric dust collecting means for supplying an electric force between the discharge electrode and the discharge electrode, providing a substance removing means for continuously flowing the liquid down on the inner surface of the dust collection electrode, and providing a dust collection promoting portion to the discharge electrode, An unequal electric field is created between the collection electrode and the discharge electrode, which causes a corona discharge, and positive ions are neutralized by the discharge electrode, and negative ions travel toward the collection electrode. When smoke passes through the uneven electric field, the black smoke as particles gains a negative charge and becomes a negative conductor, and is attracted to the dust collection electrode by Coulomb force. The presence of the electrode makes it easier for the particles in the flue gas to become charged on the discharge electrode. It is positively neutralized by the pole and positively directs the negative ions to the dust collection electrode, and the odor particles are also adsorbed on the inner surface of the dust collection electrode and have a deodorizing effect. Fluid is continuously supplied to the inner surface of the dust collection electrode to form a liquid film, so black smoke with low electrical resistivity loses charge and is absorbed by the liquid before it re-scatters and flows down Therefore, black smoke can be easily collected.

[Brief description of the drawings]

FIG. 1 is a sectional view of the dust collecting and removing means of FIG.

FIG. 2 is a system configuration diagram of the smoke exhaust treatment device.

FIG. 3 is a partial front view of a discharge electrode in another modification.

FIG. 4 is a front view of a discharge electrode provided with a spiral member in another modification.

[Explanation of symbols]

 2 incinerator 4 flue gas treatment device 58 substance removing means 62 dust collecting electrode 106 discharge electrode 120 electric dust collecting means

Claims (1)

[Claims] An incinerator for incineration of waste is provided,
In the incinerator flue gas treatment device that removes the substances in the flue gas that is led from the incinerator to the flue, a cylindrical dust collecting electrode that allows the smoke to pass is set up and discharged into this dust collecting electrode. An electrode is provided, an electric dust collecting means for supplying an electric force between the dust collecting electrode and the discharge electrode is provided, and a substance removing means for continuously flowing liquid on an inner surface of the dust collecting electrode is provided, and the discharge electrode is provided. Is a flue gas treatment device for an incinerator, provided with a dust collection promoting unit.