JP2001087623A - Exhaust gas cleaning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively remove harmful gas in exhaust gas by a small-sized apparatus. SOLUTION: An exhaust gas cleaning apparatus is equipped with a exhaust gas feed-in pipe having a large number of exhaust holes 4A arranged in an ultrasonic treatment apparatus 1, a mixed liquid material supply pipe 7 for supplying an activated carbon/graphite/catalyst mixed liquid material 2 into the ultrasonic treatment apparatus 1, a plurality of the ultrasonic vibrators 3 arranged under the surface of the activated carbon/graphite/catalyst mixed liquid material 2 and an exhaust discharge pipe 5 discharging treated exhaust gas to the atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying apparatus suitably used in an incinerator, an incineration ash melting furnace and the like.

[0002]

2. Description of the Related Art Conventionally, for example, incinerated ash obtained by incinerating general waste or industrial waste at 900 ° C. or less contains substances and metals which are harmful to the environment and humans. And these harmful substances, such as P
Means for detoxifying CB, dioxin, lead, cadmium and the like cannot be solved by incinerators using ordinary fuels. If this incinerated ash is directly disposed of in landfills, it is natural that water and soil pollution will occur. In addition, recently, the above-mentioned metals are eluted due to acid rain reaching pH 3 and seriously affect drinking water. Give it. Conventionally, to solve this problem, various methods have been proposed to detoxify harmful substances by melting incineration ash.However, technology to treat harmful exhaust gas generated from these at low cost is still being developed. It has not been.

Conventionally, most of the harmful gases contained in the exhaust gas from incinerators are absorbed and removed by graphite materials.
To increase the contact area between the graphite material and the exhaust gas, the graphite material is dropped from a large graphite storage tank into the flue of the exhaust gas to absorb and remove harmful gases, especially dioxin, in the exhaust gas. In many cases, an appropriate amount of graphite material does not fall from the narrow falling part of the graphite storage tank, and the graphite material is dropped using various devices.
It is not a sufficient means for eliminating harmful gases, and there is a problem that the equipment cost of the graphite storage tank and its auxiliary equipment is large.

In order to eliminate harmful gas by using a filter, a large bag filter or a filter device of about 10 m is required for a flue, which has a problem that equipment cost and installation area are large. Furthermore, when graphite material is dropped into a high temperature exhaust pipe or flue, there is a danger of ignition and explosion when filled with graphite ash.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide an exhaust gas purifying apparatus capable of effectively removing harmful gas in exhaust gas with a small apparatus. .

[0006]

To achieve the above object, an exhaust gas purifying apparatus according to the present invention comprises an exhaust gas inlet pipe having a plurality of exhaust holes, which is disposed inside an ultrasonic treatment apparatus, and has an exhaust gas inlet pipe having a plurality of exhaust holes. A mixed liquid material supply pipe for supplying an activated carbon / graphite / catalyst mixed liquid material inside the sonication device, and a plurality of ultrasonic vibrators disposed below the liquid level of the activated carbon / graphite / catalyst mixed liquid material And an exhaust delivery pipe for discharging the treated exhaust to the outside air.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of an exhaust gas purifying apparatus of the present invention, FIG. 1 is an overall configuration diagram of the exhaust gas purifying apparatus, FIG. 2 is a cross-sectional view of the ultrasonic processing apparatus of FIG. 1, and FIG. FIG. 3 is a perspective view of the exhaust gas inlet pipe of FIG. 2.

[0008] The exhaust gas from the incinerator etc.
1 through the exhaust gas inlet pipe 4 and the exhaust gas inlet valve V1 to be fed into the ultrasonic processing apparatus 1. The storage tank 9
It is a tank for supplying a mixed liquid material 2 (FIG. 2) of activated carbon, graphite and a catalyst inside the ultrasonic processing apparatus 1, and is a mixed liquid of activated carbon, graphite and catalyst inside the ultrasonic processing apparatus 1. When the material 2 is insufficient, the automatic control unit 13 is operated by a signal of the level sensor 10A provided in the ultrasonic processing apparatus 1, and the control valve V2 provided in the mixed liquid material supply pipe 7 is opened, so that the ultrasonic processing apparatus 1 When the mixed liquid material 2 is supplied to the inside and the supply amount reaches a set reference value, the automatic control unit 13 is operated by the signal of the level sensor 10, and the control valve V2 is closed to stop the supply of the mixed liquid material 2. . The catalyst of the activated carbon / graphite / catalyst mixed liquid material 2 mixes metal particles, metal oxide powder or metal oxide particles to make the harmful gas more harmless.

The exhaust gas after removing the harmful gas from the exhaust gas by the ultrasonic treatment apparatus 1 passes through the exhaust delivery pipe 5, the exhaust valve V3, the exhaust control valve V4, the gas sensor section 14 and the exhaust pipe 15 by the exhaust blower F2. , Are discharged from the exhaust chimney 16 to the outside air. When the concentration level of various harmful gases contained in the exhaust gas from the ultrasonic processing apparatus 1 is equal to or higher than the specified value, the automatic control unit 12 is operated by the sensor signal of the gas sensor unit 14, and the exhaust control V4 is closed. At the same time that the exhaust gas is not released to the outside air, the feedback valve V5 is opened, the rotation of the exhaust blower F2 is made faster than usual, and the exhaust gas containing harmful gas is sent back to the ultrasonic processing apparatus 1 through the feedback pipe 8. After an arbitrary time, the automatic control unit 12 is operated, and the exhaust blower F2 returns to the normal rotation, and the feedback valve V5
Is closed, the exhaust control V4 is opened, and the harmful gases in the exhaust gas are analyzed by the automatic control unit 12 by the gas sensor unit 14, and the operation is returned to the normal operation state when it is within the reference value.

FIG. 2 shows the internal structure of the ultrasonic processing apparatus 1. As shown in FIG. 3, an exhaust gas inlet pipe 4 having an arbitrary number of exhaust holes 4A is connected to an activated carbon / graphite / catalyst mixed liquid material 2. Arbitrary number of ultrasonic vibrators 3 are arranged below the liquid surface and directly below the exhaust inlet pipe 4.
And the activated carbon / graphite / catalyst mixture 2 is always
Exhaust gas containing carbon monoxide, carbon dioxide, dioxin, nitrogen monoxide, nitrogen dioxide, sulfur dioxide, etc. discharged from the exhaust hole 4A is absorbed by the activated carbon / graphite / catalyst mixed liquid material 2 , To suppress.

A filter / catalyst section 6 connected to the exhaust delivery pipe 5 prevents the particles present in the activated carbon / graphite / catalyst mixed liquid material 2 from being discharged, and at the same time, in the ultrasonic treatment apparatus 1. The harmful gas components that could not be completely absorbed and suppressed by the activated carbon / graphite / catalyst mixture 2 are reduced by the catalyst,
It is reduced within the reference value and discharged from the exhaust delivery pipe 5 to the outside air.

A mixed liquid material discharge pipe 2A connected to the ultrasonic treatment device 1 is provided for discharging the activated carbon / graphite / catalyst mixed liquid material 2 to the outside by opening the discharge valve V6 if necessary and reusing it. Have been.

The ultrasonic oscillator 11 sends electric energy for mechanically oscillating an arbitrary number of ultrasonic oscillators 3 provided inside the ultrasonic processing apparatus 1 to the ultrasonic oscillator 3 via the connection wire 3A. I have. Ultrasonic frequency is 28KHz to 1
MHz, and the frequency is set so as to give the best mist and blow-up in the particle state of the activated carbon / graphite / catalyst mixed liquid material 2.

[0014]

As is clear from the above description, according to the present invention, a large amount of harmful gas can be treated in a small apparatus by ultrasonic treatment using a mixed liquid material of activated carbon, graphite and catalyst.
In particular, when the harmful gas in the exhaust gas to be exhausted to the outside is equal to or higher than the reference value, the exhaust gas mixed with the harmful gas is fed back to the ultrasonic processing device by the signal of the gas sensor of the harmful gas,
By causing the reprocessing to be performed to a value equal to or less than the reference value, it is possible to prevent the exhaust gas containing the harmful gas from being discharged to the outside.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of an exhaust gas purification device of the present invention.

FIG. 2 is a sectional view of the ultrasonic processing apparatus of FIG.

FIG. 3 is a perspective view of the exhaust gas inlet pipe of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ultrasonic treatment apparatus 2 ... Activated carbon / graphite / catalyst mixed liquid material 3 ... Ultrasonic vibrator 4 ... Exhaust inlet pipe 4A ... Exhaust hole 5 ... Exhaust outlet pipe 7 ... Mixed liquid material supply pipe 10, 10A ... Level Sensor 14: Gas sensor unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 53/56 53/62

Claims (3)

[Claims] 1. An exhaust inlet pipe having a plurality of exhaust holes disposed inside an ultrasonic processing apparatus, and a mixed liquid material for supplying a mixed liquid of activated carbon, graphite, and catalyst to the inside of the ultrasonic processing apparatus. A supply pipe, a plurality of ultrasonic vibrators disposed below the liquid level of the activated carbon / graphite / catalyst mixed liquid material, and an exhaust delivery pipe for discharging the treated exhaust gas to the outside air. Exhaust gas purifying device. 2. The exhaust system according to claim 1, wherein a level sensor is provided inside the ultrasonic processing apparatus to maintain a liquid level of the mixed material of activated carbon, graphite and catalyst at a predetermined value. Gas purification device. 3. The exhaust gas delivery pipe is provided with a gas sensor section, and when the harmful gas contained in the exhaust gas is equal to or more than a predetermined value, the exhaust gas is fed back to the ultrasonic treatment device. Exhaust gas purification equipment.