JP3408223B2 - Exhaust gas detoxification equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas detoxifying apparatus for removing harmful substances in exhaust gas with molten glass.

[0002]

2. Description of the Related Art Exhaust gas discharged from incinerators, etc. contains toxic substances such as dioxins and heavy metals, and substances that destroy the global environment such as carbon dioxide gas. It is desired to develop a technology for removing these harmful substances from exhaust gas to render them harmless. this house,
The technology for removing harmful substances using molten glass is not limited to the decomposition and removal of toxic dioxins and polychlorinated biphenyls, but also carbon dioxide, nitrogen oxides, sulfur oxides, heavy metal oxides such as lead and arsenic, and halogen-based substances. Such gases can be dissolved in the glass and removed, and are attracting attention.

In the technique of removing harmful substances in exhaust gas with this molten glass, it is a problem to improve the removal efficiency of harmful substances by devising a method of contacting the exhaust gas with the molten glass. In the one disclosed in Kai 2000-2407, the exhaust gas discharged from the incinerator is guided to a glass melting furnace, the exhaust gas is bubbled into the molten glass, and a porous plate or a mesh plate is arranged in the glass melting furnace. By so doing, the bubble of the exhaust gas to be bubbled is finely divided, the contact area between the exhaust gas and the molten glass is increased, and a device for increasing the efficiency of removing harmful substances is adopted.

SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust gas detoxification treatment apparatus which efficiently removes harmful substances in exhaust gas with molten glass to render them harmless.

[0005]

In order to solve the above-mentioned problems, the exhaust gas detoxifying apparatus of the present invention is provided with a slit continuous in the longitudinal direction at the bottom of a horizontally elongated glass melting tank, One of the slit walls forming the, or the hanging wall extending below this slit wall, provided with a large number of micropores communicating with the air supply chamber to which the exhaust gas is supplied, below the slit, the melt falling from the slit A configuration is provided in which a reservoir for receiving glass is provided, and the exhaust gas supplied to the air supply chamber is mixed into the molten glass that falls in a curtain shape along the slit wall or the hanging wall provided with the minute holes, from the minute holes. It was adopted.

That is, a slit extending in the longitudinal direction is provided at the bottom of a horizontally long glass melting tank, and exhaust gas is evenly mixed through fine holes into the molten glass that drops like a curtain from the slits, and a large number of slits are formed. While letting fine exhaust gas bubbles contact molten glass, drop them into a collecting tank,
Furthermore, by letting these bubbles sink into the reservoir with the force of falling and floating, the exhaust gas is contacted uniformly with the molten glass over a wide contact area for a long time, and the harmful substances in the exhaust gas are efficiently removed. I made it possible.

By providing a porous, mesh, honeycomb, fiber or whisker filter made of ceramic or heat-resistant metal on the inlet side of the air chamber, sensible heat of exhaust gas and combustion heat of unburned components are generated. These filters can be red-heated to burn unburned components contained in the fly ash and the like in the exhaust gas to gasify solid harmful substances and bubble them in the molten glass. Further, it is possible to prevent the clogging of the micropores due to fly ash or the like.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. This exhaust gas detoxification treatment device is
As shown in FIGS. 1 and 2, a slit 2 continuous in the longitudinal direction is provided at the bottom of a horizontally long melting tank 1 in which a glass raw material is melted, and the slit 2 hangs down one of the slit walls 3 forming the slit 2. The wall 4 is extended, and on the back side of the hanging wall 4, an air supply chamber 7 to which the exhaust gas 6 is supplied via a filter chamber 5 is arranged in parallel, and receives a molten glass 8 falling from the slit 2 below the slit 2. An exhaust gas 6 supplied to an air supply chamber 7 from a large number of minute holes 10 provided in a drooping wall 4 is provided with a reservoir tank 9 into a molten glass 8 that drops in a curtain shape along the drooping wall 4. It is mixed evenly.

One longitudinal side wall 11 of the melting tank 1 is formed vertically and the other longitudinal side wall 12 is inclined.
The slit 2 is provided along the vertical side wall 11.
A heater 13 for melting the glass raw material is arranged outside each of the side walls 11 and 12, and a heater 14 for heating the molten glass 8 falling inside the slit 2 is arranged outside each slit wall 3.
The side walls 11 and 12 and the outside of each slit wall 3 are covered with castable refractory material 15.

As shown in FIG. 2, the slit 2 is formed so as to be narrowed downward in the longitudinal direction so that the molten glass 8 falling from the slit 2 can be stably shaped like a curtain. Since the curtain-shaped molten glass 8 has a negative pressure due to its falling speed, the exhaust gas 6 in the air supply chamber 7 is mixed into the molten glass 8 through the fine holes 10 without providing a special pressurizing means. Then, the fine bubbles 16 are dropped into the pool tank 9 together with the molten glass 8.

The fine bubbles 16 falling together with the molten glass 8 are accumulated in the pool 9 by the force of the falling.
Then, it floats on the liquid surface of the molten glass 8 due to buoyancy, and comes into contact with the high temperature molten glass 8 uniformly over a wide contact area for a long time. Therefore, the harmful substances in the exhaust gas 6 are decomposed by heat or melted in the molten glass 8 to be removed, and the clean exhaust gas 6 detoxified into the exhaust chamber 17 formed in the upper part of the collecting tank 9. Be recovered.

The clean exhaust gas 6 collected in the exhaust chamber 17 is discharged to the outside from an exhaust port 19 communicating with an overflow port 18 of the molten glass 8. At the same time as the discharge of the exhaust gas 6, the atmosphere flows into the exhaust chamber 17 through the overflow port 18, and the surface of the molten glass 8 on the exhaust port 19 side, which drops along the hanging wall 4 in a curtain shape, is exposed to oxygen in the atmosphere. The reaction of the molten glass 8 forms a film of silicon dioxide. This film functions to prevent the bubbles 16 of the exhaust gas 6 from coming out of the curtain-shaped molten glass 8 toward the exhaust chamber 17 side. Therefore, the exhaust gas 6 containing harmful substances does not leak to the exhaust chamber 17 side.

A porous filter 20 made of a sintered plate of alumina is mounted in the filter chamber 5. The filter 20 burns unburned components contained in fly ash and the like in the exhaust gas 6 supplied from the inlet 21 of the filter chamber 5, gasifies solid harmful substances, and supplies the exhaust gas 6 to the air supply chamber 7. To do. The filter 20 is red-heated by the sensible heat of the exhaust gas 6 and the combustion heat of the unburned component, burns the unburned component, and prevents the fine holes 7 from being clogged by fly ash or the like.

In the above-described embodiment, the minute holes 10 communicating with the air supply chamber 7 are provided in the hanging wall 4, but they may be provided in the slit wall 3. Further, the glass raw material is melted directly in the melting tank 1, but a melting tank or a melting kiln for melting the glass raw material is separately provided, and the molten glass melted by these is put into the melting tank 1. Good.

[0015]

As described above, according to the apparatus for detoxifying exhaust gas of the present invention, a slit extending in the longitudinal direction is provided at the bottom of a horizontally long glass melting tank, and a molten glass dropping from this slit in a curtain shape. Inside, the exhaust gas was evenly mixed through the micropores, and a large number of fine exhaust gas bubbles were dropped into the reservoir while contacting with the molten glass.
Since these bubbles are made to sink by the force of falling and float in the collecting tank, the exhaust gas is contacted with the molten glass uniformly over a wide contact area for a long time, and the harmful substances in the exhaust gas are reliably and efficiently discharged. Can be removed well.

A porous, mesh-shaped, honeycomb-shaped, fiber-shaped or whisker-shaped filter made of ceramic or heat-resistant metal is provided on the inlet side of the air chamber so that sensible heat of exhaust gas and combustion heat of unburned components are generated. These filters can be red-heated to burn unburned components contained in fly ash and the like in the exhaust gas, gasify all harmful substances, and bubble in the molten glass.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of an exhaust gas detoxification treatment apparatus.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

1 melting tank 2 slits 3 slit walls 4 hanging wall 5 filter room 6 exhaust gas 7 air supply room 8 molten glass 9 reservoir 10 micropores 11, 12 Side wall 13, 14 heater 15 Castable refractories 16 bubbles 17 Exhaust chamber 18 Overflow port 19 exhaust port 20 filters 21 entrance

Claims (2)

(57) [Claims] 1. Exhaust gas is supplied to a slit wall extending in the longitudinal direction at the bottom of a horizontally long glass melting tank, and one slit wall forming this slit or a hanging wall extending below the slit wall. A large number of minute holes communicating with the air supply chamber are provided, a reservoir for receiving molten glass falling from the slits is provided below the slit, and a curtain shape is provided along the slit wall or the hanging wall provided with the minute holes. An apparatus for detoxifying an exhaust gas, wherein the exhaust gas supplied to the air supply chamber is mixed into the molten glass that falls through the fine holes. 2. The glass melting furnace according to claim 1, wherein a porous, mesh-shaped, honeycomb-shaped, fiber-shaped or whisker-shaped filter made of ceramic or heat-resistant metal is provided on the inlet side of the air supply chamber.