JPH10272331A - Mist component separation device for pyrolysis gas of industrial waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently remove mist components in a pyrolysis gas, which hinders a combustion deodorizing treatment, by, after confining pyrolysis gas of industrial waste containing mist components into a large number of bubbles, treating the bubbles are with a centrifuge to forcibly separate the mist components from the pyrolysis gas. SOLUTION: The mist component separation device 80 is constituted a foaming tank 81 and a centrifuge 85, and in the tank 81, a foaming nozzle 82 as a foaming device is provided extending to the bottom of the tank 81, and pyrolysis gas is passed through small holes of the nozzle 82 and discharged into the tank 81, whereby the gas is discharged in the form of small bubbles and the bubbles are collected on the liquid surface. And the bubbles filled into the tank 81 is forced out by succeeding bubbles so as to be fed to the centrifugal separator 85 through connection pipe 81a. The bubbles each including mist component are pressed against the inner wall of a separation tank 85c and collapsed and turned to liquid. The pyrolysis gas free from mist component is drawn into an upper pipe and sent to a following process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for thermally decomposing industrial waste, and more particularly to an apparatus for efficiently separating and removing a mist component contained in a pyrolyzed gas and obstructing combustion deodorization. The present invention relates to an apparatus for separating mist components of pyrolysis gas from industrial waste.

[0002]

2. Description of the Related Art At present, the amount of industrial waste such as resin-based waste, garbage, medical waste and used disposable diapers from cities, factories, general households, hospitals and the like is extremely large. Has become. And the treatment of these industrial wastes
Each is performed in the following manner.

[0003] First, there is an incineration treatment. This is a method in which each industrial waste is incinerated at around 1000 degrees Celsius in a combustion furnace for disposal. This processing is the most general processing method.

[0004] As a second processing method, there is a dumping processing. This is a processing method in which each industrial waste is subjected to a volume reduction treatment such as finely pulverizing and compressing, and then stored in a container, a bag, or the like, and dumped in a dumping land or buried in a landfill.

[0005] However, in the case of the first incineration treatment, there is a problem that toxic gas, black smoke and dust are generated, and pollutants are scattered around the incineration plant. In addition, there is a problem that the incineration apparatus is seriously damaged due to the generation of high heat and high-temperature gas by incineration. Further, there is a problem that harmful substances are left as residues, and harmful substances are included in fly ash and generated gas.

In this case, in order to collect generated gas and dust, a method of spraying water into the exhaust gas in a shower-like manner may be used. However, since the water is sprayed in a shower-like manner, the pressure is reduced. As a result, there has been a problem that the treatment cannot be performed, and the odor leaks from the exhaust gas.

Further, in the case of the second dumping treatment, there is a problem that secondary pollution such as the destruction of the dumping land itself or contamination of groundwater by waste occurs.

In view of the above problems, the present applicant has proposed a method and apparatus for dehydrochlorination of industrial waste, which can appropriately and efficiently treat industrial waste without causing pollution, and furthermore, an organic matter. For a method of treating industrial waste containing, and applied for a patent.

[0009]

FIG. 3 shows an apparatus for thermally decomposing industrial waste invented by the present applicant. The pyrolysis apparatus 1 for industrial waste is generally composed of a pyrolysis furnace 10, a gas diffusion device 20, a tar removal device 30, and a neutralization tank 50.
, A decompression pump 60, and a combustion deodorization device 70.

A pyrolysis chamber 11 provided in a pyrolysis furnace 10
The industrial waste put into the furnace is decompressed to below the atmospheric pressure by the decompression pump 60 and heated from the bottom of the pyrolysis chamber 11.
By heating, industrial waste is dehydrated and pyrolyzed. The gas generated by the thermal decomposition recovers harmful substances in the gas diffusion device 20, the tar removal device 30, and the neutralization tank 50, respectively. The finally remaining gas is burned in the combustion deodorizing device 70 to be thermally decomposed.

Most of the pyrolyzed industrial waste contains only carbon components. Subsequent processing can be easily performed. Industrial waste can be treated safely and without pollution by using the thermal decomposition treatment apparatus.

Here, in order to deodorize by burning in the combustion deodorizing device 70, it is necessary to maintain the combustion temperature at 800 ° C. or higher. However, the gas remaining finally contains a large amount of mist components. For this reason, when it burned in the combustion deodorizer 70, the mist component hindered the combustion, and the combustion temperature could not be maintained at 800 ° C. or higher, and the deodorization could not be performed completely.

An object of the present invention is to provide an apparatus for separating mist components of pyrolysis gas from industrial waste, which can efficiently separate and remove mist components which are contained in the pyrolysis gas and become obstacles during the combustion deodorization treatment. To provide.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a foaming means for confining a pyrolysis gas of industrial waste containing a mist component in a number of bubbles, and
Separation means for forcibly separating and removing mist components from the pyrolysis gas by injecting air bubbles, and separating means for removing the mist components from the pyrolysis gas. A mist component separation device.

According to a second aspect of the present invention, in the apparatus for separating a mist component of a pyrolysis gas of industrial waste according to the first aspect, the foaming means is filled with a water containing a surfactant. And a blowing device for blowing the pyrolysis gas into the foaming tank to form bubbles.

According to a third aspect of the present invention, in the apparatus for separating a mist component of a pyrolysis gas of industrial waste according to the first or second aspect, the separating means separates the mist component from the bubbles by centrifugal force. It is a centrifugal separator.

According to a fourth aspect of the present invention, in the apparatus for separating a mist component of a pyrolysis gas of an industrial waste according to the first or second aspect, the separating means separates the mist component from the bubbles by centrifugal force. It is a cyclone.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an outline of an apparatus for thermally decomposing industrial waste will be described (see FIG. 3). An industrial waste pyrolysis treatment apparatus 1 is roughly composed of a pyrolysis furnace 10,
Gas diffusion device 20, tar removal device 30, neutralization tank 5
0, a decompression pump 60, and a combustion deodorization device 70.

In FIG. 3, the pyrolysis furnace 10 is a device for heating and thermally decomposing industrial waste. First, industrial waste is put into a pyrolysis chamber 11 provided in a pyrolysis furnace 10. Next, the thermal decomposition chamber 11 is sealed, and the pressure inside the thermal decomposition chamber 11 is reduced to a pressure lower than the atmospheric pressure by the vacuum pump 60.
Then, the pyrolysis chamber 11 is heated from the outside in an oxygen-free state. By reducing the pressure inside the thermal decomposition chamber 11, outflow of the toxic gas to the outside is prevented. Further, by setting the oxygen-free state, chlorine gas generated by thermal decomposition can be prevented from being combined with oxygen in the thermal decomposition chamber 11 to generate highly toxic dioxin. By heating, the temperature in the thermal decomposition chamber 11 rises. The water contained in the industrial waste is once dehydrated by maintaining the temperature at about 100 to 160 ° C. once. After the dehydration is completed, the pyrolysis chamber 11 is heated to a predetermined pyrolysis temperature to pyrolyze the industrial waste.

The gas generated by the thermal decomposition is collected in the gas diffusion device 20. The gas diffusion device 20 is a device for separating predetermined components in gas generated by thermal decomposition. The gas diffusion device 20 blows gas into a water tank having a stirring device filled with a predetermined solution to dissolve and collect the components of the gas in the solution. By filling the water tank with water, chlorine gas, which is a water-soluble component of the gas, can be separated. Further, the water in the water tank becomes hydrochloric acid due to the chlorine gas dissolved in the water tank. Hydrochloric acid whose concentration has exceeded a certain level
It is discharged to the recovery tank 40. The discharged hydrochloric acid is neutralized with an alkaline substance such as sodium hydroxide, calcium hydroxide, etc., and recovered as harmless sodium chloride and calcium chloride.

The tar removing device 30 is a device for separating tar contained in the pyrolysis gas. The tar removing device 30 collects the tar content floating on the water surface of the water tank of the diffusion device 20. The neutralization tank 50 blows a pyrolysis gas into a water tank filled with a predetermined solution to dissolve and recover the components in the solution. A water-soluble gas component that cannot be completely recovered by the gas diffusion device 20 may be recovered, or a solvent that can dissolve and recover another specific gas component may be added. Since the pyrolysis gas finally left is a hydrocarbon-based gas such as methane gas or ethane gas, it is self-burned by the combustion deodorizer 70 to thermally decompose the odor component.

Next, an apparatus for separating mist components from pyrolysis gas of industrial waste according to the present invention will be described based on preferred embodiments shown in FIGS. 1 and 2. The mist component separation device is provided between the neutralization tank 50 and the combustion deodorization device 70. Then, the mist component in the pyrolysis gas is separated. FIG. 1 is a schematic view of an embodiment of an apparatus for separating mist components of pyrolysis gas of industrial waste according to the present invention. FIG. 2 is a schematic view showing one mode of use of the apparatus for separating mist components of pyrolysis gas of industrial waste according to the present invention.

First, the configuration of the apparatus for separating mist components of pyrolysis gas from industrial waste according to the present invention will be described. The mist component separation device 80 is a device for forcibly separating only the mist component from the pyrolysis gas in which the mist component and the gas are mixed and supplying only the gas to the next step.

As shown in FIG. 1, the mist component separation device 80 generally has a foaming tank 81 and a centrifugal separator 85. The foaming tank 81 is filled with a solution containing a surfactant at a concentration sufficient for foaming. And the supply pipe 83
Reaches the bottom of the foaming tank 81. A foaming nozzle 82 as a foaming device for promoting foaming may be provided at the tip of the supply pipe 83.

The foaming nozzle 82 is a box having a number of small holes around it. The pyrolysis gas passes through the small holes of the foaming nozzle 82 and is discharged into the foaming tank 81. Foaming nozzle 82
Is provided, the pyrolysis gas can be discharged as fine bubbles.

The mist component contained in the pyrolysis gas is confined inside the bubbles together with the pyrolysis gas and becomes bubbles and floats on the liquid surface. The bubbles floating on the liquid surface maintain the shape of the bubbles for a certain time due to the action of the surfactant. Since the foam is supplied continuously, it is deposited on the liquid surface. Therefore, foaming tank 8
An aggregate of fine bubbles can be generated on the liquid surface of No. 1.

A communication pipe 81a is provided at a position close to the liquid surface of the foaming tank 81. The communication pipe 81a is connected to a centrifuge 85. The foam filled in the foaming tank 81 is
It is extruded by bubbles generated later, flows into the communication pipe 81a, and is supplied to the centrifuge 85.

The centrifuge 85 has a main body 85d.
, A motor 85a, a rotating shaft 85b, and a separation tank 85c. Rotating shaft 85 by motor 85a
By rotating b, the separation tank 85c is rotated.

The foam flowing into the connecting pipe 81a is separated from the separation tank 85
c. The foam containing the mist component is pressed against the inner wall of the separation tank 85c by centrifugal force and collapses to return to the original liquid. Thus, even a light mist component that is difficult to be caught by the centrifugal separator can be separated by the centrifugal separator by trapping in a foam.

The liquid travels along the inner wall of the main body 85d and accumulates in a water storage tank 87 provided below the centrifugal separator 85. The liquid stored in the water storage tank 87 is returned to the foaming tank 81 by the pump 88 again. The pyrolysis gas from which the mist component has been separated and removed is directly sucked from a pipe provided at the upper part of the centrifugal separator 85 and carried to the next step.

The mist component separation device 80 of the present invention can perform centrifugal separation by wrapping a gas containing a mist component which is hard to be subjected to centrifugal separation with fine bubbles. Thereby, it can be separated into only gas components.

In this embodiment, the mist component separation device 80
Is provided between the neutralization tank 50 and the vacuum pump 60 as shown in FIG. The mist component separation device 80 separates and removes a mist component that hinders combustion contained in the pyrolysis gas supplied to the combustion deodorization device 70. Thereby, the combustion temperature of the combustion deodorization device 70 can be stably maintained.

Further, the mist component separation device 80 can also absorb and collect the water-soluble components contained in the gas by the bubbles. Furthermore, the tar cooled and liquefied in the foaming tank 81 is:
It can be recovered by emulsification in association with a surfactant. That is, by providing the separation device 80, not only gas can be separated but also water-soluble components and non-water-soluble components can be absorbed and recovered.

In this embodiment, the centrifugal separator 85 is used as the separation device 80. However, any device can be used as long as it can break bubbles and separate the mist component and the liquid. May be. A cyclone may be used instead of the centrifuge 85.

[0035]

According to the present invention, there is provided an apparatus for separating mist components of pyrolysis gas from industrial waste, comprising: a bubble generating means for confining the pyrolysis gas of industrial waste containing mist components in a number of bubbles; The mist component is forcibly separated and removed from the pyrolysis gas, and the separation device is configured to remove the mist component from the pyrolysis gas, so that even a light mist component hardly caught by the centrifuge. There is an effect that water vapor can be separated by a centrifugal separator by trapping in a foam.

[Brief description of the drawings]

FIG. 1 is a schematic view of an embodiment of an apparatus for separating mist components of a pyrolysis gas of industrial waste according to the present invention.

FIG. 2 is a schematic view showing one use mode of the apparatus for separating mist components of pyrolysis gas of industrial waste according to the present invention.

FIG. 3 is a schematic view showing an apparatus for thermally decomposing industrial waste.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heating furnace 20 Gas diffusion device 30 Tar removal device 40 Processing tank 50 Neutralization tank 60 Decompression pump 70 Combustion deodorization device 80 Separation device 81 Foaming tank 81a Connecting pipe 82 Foaming nozzle 85 Centrifugal separator 85a Motor 85b Rotating shaft 85c Separation tank 85d Main body 87 Water storage tank 88 Pump

Claims (4)

[Claims] 1. A bubble generating means for confining a pyrolysis gas of industrial waste containing a mist component in a number of bubbles, and forcibly separating and removing a mist component from the pyrolysis gas by introducing the bubbles. And a separation means for removing a mist component from the pyrolysis gas. An apparatus for separating a mist component of a pyrolysis gas of industrial waste, comprising: 2. The apparatus for separating a mist component of a pyrolysis gas of industrial waste according to claim 1, wherein the foaming means comprises: a foaming tank filled with water containing a surfactant; A blowing device for blowing the pyrolysis gas into a tank to form bubbles, and a mist component separation device for the pyrolysis gas of industrial waste. 3. The apparatus for separating mist components of a pyrolysis gas of industrial waste according to claim 1 or 2, wherein the separation means is a centrifugal separator for separating mist components from the bubbles by centrifugal force. An apparatus for separating mist components from pyrolysis gas of industrial waste. 4. The apparatus for separating mist components of pyrolysis gas of industrial waste according to claim 1 or 2, wherein the separating means is a cyclone that separates mist components from the bubbles by centrifugal force. A mist component separation device for pyrolysis gas from industrial waste.