JP3022495B2 - Secondary combustion furnaces for waste treatment facilities, packing for waste treatment facilities and secondary combustion furnaces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary combustion furnace for waste treatment facilities and a waste treatment facility, and more particularly to a method for suppressing the generation of dioxins by reducing hydrogen chloride gas in exhaust gas. It is about technology.

[0002]

2. Description of the Related Art In recent years, it has become an urgent task to protect the global environment by suppressing the generation of harmful substances, particularly dioxins, in municipal waste incineration facilities and industrial waste treatment facilities. It is said that hydrogen chloride gas is involved in the generation of dioxins. Since the hydrogen chloride gas in the combustion gas can be recovered by slaked lime, conventionally, the combustion gas generated at the time of incineration of wastes has been heated to 150 ° C.
A method of cooling to a temperature of ~ 250 ° C and spraying slaked lime to recover hydrogen chloride gas is employed.

[0003]

However, the emission standards for dioxins are becoming increasingly strict, and recently, some of the existing treatment facilities have received orders for suspension or improvement.

[0004] Dioxins are 300 ° C to 400 ° C.
It is said that it is already generated in a high temperature range of ℃, and the method of spraying slaked lime is no longer able to sufficiently suppress the generation of dioxins.

Further, the method for recovering hydrogen chloride gas by spraying slaked lime has a problem in running cost since a large amount of slaked lime is used.

Accordingly, the present invention is to reduce the generation of dioxins in a waste treatment facility by reducing the amount of hydrogen chloride gas before the combustion gas generated during waste treatment reaches the dioxin generation temperature. Aim.

[0007]

Means for Solving the Problems A secondary combustion furnace for a waste treatment facility of the present invention, which has been made to achieve the above object, comprises:
This is a secondary combustion furnace that is provided following the furnace body of the waste treatment facility, and in the area between the area for performing secondary combustion and the outlet of the secondary combustion gas, there is a type of quartz schist, Purarai also provided packing layer filled with many fillings that the stone as a raw material
The filling is obtained by crushing the Hoguraishi
The powder is used as the main raw material and molded into a cylindrical shape, cured by sintering.
Characterized by cylindrical ceramics . Here, "Horai stone" is a type of quartz schist that is produced only in a specific area (approximately 1 km square) near No. 1 Tamine-shaped stepper, Tamine, Shitara-cho, Kitashitara-gun, Aichi Prefecture. It is said. Also, besides "Purarai-ishi", it is sometimes called "Dando silica".

[0008] In this case, the filling of the Penglai stone as a raw material
For example , using the raw stone of Hoguraishi itself, using ceramics obtained by molding and sintering powder crushed from Hoguraishi ,
The finely ground Penglai stone, refractories made of spherical, cylindrical body, depending on what was carried on the surface of such a honeycomb core or perforated plates also form configured expected is moderate effect
You. In addition, it is easiest to use the Horaiite as a crushed rough ore from the processing surface. Here, it is good to use the crushed stone of the porcelain that has been hardened in advance by firing. In particular, it is preferable to use a crushed crushed stone of bonito stone in advance in an oxygen-free state, for example, under vacuum. In sintering this porcelain stone, it is desirable to employ calcination conditions that allow the porcelain stone to foam and harden as a whole.
This is because such a fired body of bonito stone does not cause weathering or the like in the secondary combustion furnace and can maintain a high effect for a long period of time. Further, as the filler, it is preferable to use a cylindrical ceramic which is formed into a cylindrical shape using powder obtained by pulverizing porcelain stone as a main raw material and hardened by sintering. Even in this sintering, sintering may be performed in an oxygen-free state using a vacuum furnace or the like. When the cylindrical ceramic is filled in the secondary combustion furnace, it is desirable that the cylindrical hole be filled without gap so that the cylindrical hole faces the flow direction of the exhaust gas in the secondary combustion furnace. When filling in the crushed stone state, a gap is inevitably formed in the upper part of the secondary combustion furnace, and there is a possibility that the secondary combustion gas without sufficiently contacting the porcelain stone is discharged. In contrast,
As mentioned above, if it is made of cylindrical ceramics,
The cylindrical ceramics can be uniformly stacked and filled without the secondary combustion furnace, and almost all of the secondary combustion gas is discharged through the gap between the packings. In addition, the formation of ceramics makes the filler more porous than in the case of crushed stone. As a result, the concentration of dioxins in the exhaust gas can be significantly reduced, as will be apparent from the examples described later using the porcelain stone made of cylindrical ceramics. In addition, this cylindrical ceramic contains 70% to 90% by weight, more preferably 7% by weight
0 wt% to 85 wt%, more preferably 80 wt% to
It is advisable to make it contained at 85% by weight.
As other components, alumina powder or refractory clay powder may be mixed as a binder, and an appropriate amount of water may be mixed to form a cylinder.

[0009] Here, the properties and the like of the enamel stone will be described. The pebble stone is estimated to have been generated at an ultra-high pressure of 10,000 atm and an ultra-high temperature due to a massive crustal deformation caused by the collision of two oceanic plates about 20 million years ago. It is said to have a crystalline structure. Componentally, according to current common analytical methods,
The SiO ₂ approximately 80-90% by weight, the Al ₂ O ₃ substantially 8
It is said to contain about 9% by weight. In addition, Hoguraite is observed as an off-white hard stone in appearance, and according to examination of mineral composition by X-ray, it is said that it contains a small amount of soda feldspar, potassium feldspar and mica in addition to quartz. I have. In addition, it is said that the porcelain stone has a fine porosity that can be confirmed only with an electron microscope, and it has been reported that it has an effect on water purification and the like. It has also been reported that engine noise was reduced by 30% in FRP fishing boats manufactured by the company. In addition, it has been reported that Hoguraishi has the ability to radiate sufficient far-infrared rays even at room temperature.

According to the secondary combustion furnace of the present invention, by providing the above-mentioned packing layer in the secondary combustion furnace, the secondary combustion gas is used as a raw material in the state of high temperature of about 800 ° C. Multiple packings can be contacted. Although it is not clear what kind of reaction, physically or chemically, takes place between the combustion gas and the packing, as will be seen in the examples described later, two reactions are performed in the same waste treatment facility. When comparing the case where the packing layer is provided and the case where the packing layer is not provided in the next combustion furnace, when the packing layer is provided, the concentration of hydrogen chloride and the concentration of dioxins in the exhaust gas finally discharged from the chimney are reduced. It is greatly reduced. From this, it is inferred that some reaction such as decomposition or adsorption of hydrogen chloride is caused by bringing the secondary combustion gas into contact with the above-mentioned packed bed. And in response to the reduction of hydrogen chloride,
It is estimated that the content of dioxins in the exhaust gas is also greatly reduced. From this fact, by contacting the secondary combustion gas with the above-mentioned packing in a high temperature state, particularly in a state higher than 400 ° C., which is said to be a temperature at which dioxins are formed, chloride which forms dioxins is formed. It is considered that hydrogen can be reduced, thereby suppressing generation of dioxins.

In order to achieve the above object, a waste treatment facility according to the present invention comprises a furnace body for charging and burning waste, and a secondary combustion furnace provided continuously with an exhaust gas outlet of the furnace body. A waste treatment facility comprising: a secondary combustion gas generated in the secondary combustion furnace, while maintaining a temperature of 800 ° C. or more, filling the raw material is a type of quartz schist Monodea configured as to pass the layer of the object
And the filling is mainly made of powder obtained by grinding
Cylindrical ceramic molded into a cylinder and cured by sintering
It is characterized by being a mix . Also in this waste treatment facility, as the filler, it is possible to use crushed crushed stone of precipitated stone and foam-hardened it beforehand.
As a desirable mode, it is good to use a cylindrical ceramic which is formed into a cylindrical shape using powder obtained by pulverizing a porcelain stone as a main raw material and hardened by sintering.

According to this waste treatment facility, the combustion gas generated by burning the waste in the furnace main body is reburned in the secondary combustion furnace, and furthermore, the layer of the packing made from porphyry stone is formed. After being passed while maintaining the temperature of 800 ° C. or more, it is sent to a subsequent dust collector or the like. This allows
As in the above-described secondary combustion furnace, the contents of hydrogen chloride and dioxins in the exhaust gas can be significantly reduced.
In the waste treatment facility of the present invention, since the packing is made of cylindrical ceramics mainly composed of pearlite, the contact state between the exhaust gas and the packing in the secondary combustion furnace is substantially reduced. As a result that can be uniform,
The amount of dioxins in exhaust gas can be significantly reduced.

[0013] Further, the packing for a secondary combustion furnace of the present invention, which has been made to achieve the above object, is a secondary packing for a waste treatment facility.
By filling the combustion furnace, hydrogen chloride in the combustion gas
The main material is a powder that is obtained by crushing porphyrite, which is a type of quartz schist, and is used as a raw material.
With cylindrical ceramics molded into a shape and cured by sintering
There is a feature. Here, a certain effect can be expected even if a crushed crushed stone of porcelain stone is used as the filler, which is previously baked and cured in an oxygen-free state, for example, under vacuum.
I can wait. In this case, it is desirable to adopt a firing condition in which the porcelain stone is fired so as to be in a foamed and hardened state as a whole. In particular, the powder obtained by pulverizing the porcelain stone is molded into a cylindrical shape as the main raw material,
It is used a cylindrical ceramic cured by sintering
desirable. Also in this case, it is particularly desirable to perform sintering in an oxygen-free state using a vacuum furnace or the like. As described above, this packing has a function of reducing hydrogen chloride in the combustion gas by contacting the combustion gas generated when burning the waste after secondary combustion in the secondary combustion furnace. . In particular, by bringing the combustion gas into contact with this packing at a high temperature higher than the dioxin generation temperature and removing and reducing hydrogen chloride, which is the source of dioxins, from the combustion gas before dioxins are generated, such an effect is obtained. -It is considered that the effect is exhibited.

[0014]

Next, an industrial waste treatment facility according to an embodiment of the present invention will be described. As shown in FIG. 1, the industrial waste treatment facility 1 includes a furnace body 10, a secondary combustion furnace 20 provided on an outlet side of the furnace body 10,
A heat exchanger 30 provided on the outlet side of the secondary combustion furnace 20
A cyclone 40 provided on the outlet side of the heat exchanger 30; and a second cyclone 40 provided on the outlet side of the cyclone 40.
Heat exchanger 50, a slaked lime spray device 60 provided on the outlet side of the second heat exchanger 50, a bag filter 70 provided on the outlet side of the slaked lime spray device 60, and an outlet side of the bag filter 70 Discharge blower 80 provided in
A muffler 90 provided on the outlet side of the discharge blower 80, and a chimney 10 provided on the outlet side of the muffler 60.
0. And especially, the secondary combustion furnace 2
A basket 21 made of SUS316 is loaded in the region from the middle to the exit side of the center 0, and the crushed stone 23 crushed from the porcelain stone is filled therein.

In the industrial waste treatment facility 1, industrial waste such as waste plastic and urethane foam is charged from a hopper 11 provided in a furnace body 10, a hopper door 12 and a furnace door 13 are opened, and a charging pusher 14 is opened. Furnace body 10
The industrial waste is pushed into and ignited and burned. The furnace body 10 has a double structure, and the outer portion 15
Water is supplied to the furnace to reuse the heat generated in the furnace body. The hot water heated by the furnace main body 10 is taken out by a pump 15 and can be used in facilities such as a cooling and heating facility and a pool. In addition,
Reference numeral 16 in the figure denotes a safety device for adjusting the furnace pressure.

The combustion gas (including dust components) thus generated in the furnace main body 10 is sent to the subsequent secondary combustion furnace 20. In the secondary combustion furnace 20, the secondary combustion burner 2
5 reburns the combustion gas. Then, the combustion gas after the secondary combustion is discharged to the heat exchanger 30 while passing through the gap between the crushed stones 23 of the above-mentioned porcelain stone. At this time, the outlet temperature of the secondary combustion furnace 20 is 800 ° C. to 850 ° C.
Thus, the combustion control of the secondary combustion furnace 20 is performed. Therefore, the secondary combustion gas is discharged while being in contact with the crushed stone 23 of the porcelain stone at a high temperature of 800 ° C. or higher. The hydrogen chloride in the combustion gas is greatly reduced by passing the packed bed of the crushed stone 23 of the porcelain stone at a high temperature of 800 ° C. or more, as will be described later in Examples.

The heat exchanger 30 exchanges heat with water. The hot water generated by this heat exchange is also pump 31
And can be reused as a heat source for cooling and heating equipment. The heat exchanger 30 has an outlet temperature of 280 ° C to 35 ° C.
Keep at 0 ° C. The outlet temperature may be designed in consideration of the durability of the cyclone 40 and the like.

The combustion gas introduced into the cyclone 40 is
It is separated into gas and dust components. Then, the gas component is sent to the subsequent second heat exchanger 50, and the dust component is returned to the furnace main body 10 by the dust return blower 41, and is recombusted.

The second heat exchanger 50 exchanges heat using air as a medium. The air that has been warmed by heat exchange with the combustion gas is sent into the furnace body 10 via the pushing blower 51 and the air header 53. The second heat exchanger 20 is for reusing the heat of the combustion gas as a preheating source of the combustion air sent into the furnace body 10.

[0020] Slaked lime spraying by a slaked lime spraying device 60 is performed on the combustion gas discharged from the second heat exchanger 50. This is provided to further recover the hydrogen chloride remaining in the combustion gas by neutralization.

The combustion gas sprayed with slaked lime by the slaked lime spray device 60 is separated into a gas component and a dust component by the bag filter 70. Then, the gas component is discharged to the atmosphere via the discharge blower 80, the silencer 90, and the chimney 100. On the other hand, the dust component separated and collected by the bag filter 70 is returned to the furnace main body 10 by the dust return pump 71 and is reburned. The furnace body 1
The incineration ash in the area 0 is collected in the large container 17 and stored for storage.

According to the industrial waste treatment facility 1 of the embodiment described above, the crushed stone 2
By providing a packed bed filled with No. 3 and allowing the combustion gas to pass through while contacting the crushed stone 23, the hydrogen chloride content in the combustion gas is significantly reduced as will be apparent from the examples described later. Moreover, the temperature of the combustion gas in the secondary combustion furnace 20 is 800 ° C. or higher, which is higher than the temperature at which dioxins are generated.
Reduction of hydrogen chloride within zero significantly suppresses the subsequent generation of dioxins.

Further, in the present embodiment, the provision of the slaked lime spraying device 60 also makes it possible to further reduce the content of hydrogen chloride in the exhaust gas. In addition, when compared with a facility that reduces hydrogen chloride using only the slaked lime spraying device, the use of slaked lime can be saved by filling the secondary combustion furnace 20 with the crushed stone 23 of bonito stone. Further, the slaked lime spraying device 60 may be used as a spare device and driven as needed.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and can be implemented in various modes without departing from the gist of the present invention. It is.

For example, in the embodiment, the crushed stone is filled in the secondary combustion furnace 20. However, a container filled with crushed crushed stone is placed behind the secondary combustion furnace. may be the manner equip, the bruise more finely Horai stone molding a material obtained by a powder, the use of which was set to fill the sintered ceramic packing most
Desirable . In addition, if a crushed stone which was once heated to about 1300 ° C. under vacuum and fired was used instead of the crushed stone of Horaiite as it is, as is clear from Example 3 described below, maintenance and other points would be more significant. It will be excellent. Furthermore, as will be apparent from Examples 4 and 5 described below, the porcelain stone is powdered, alumina and refractory clay are mixed with the powder, water is added, and a cylindrical molded body is sintered under vacuum. When a filler made of glass ceramics is used, the effect of further reducing dioxins is exhibited. In addition, the invention may be applied not only to industrial waste but also to general municipal waste treatment facilities.

Next, test results for confirming the effect of reducing hydrogen chloride in the secondary combustion furnace 20 in the above-described embodiment will be described as examples.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments 1 to 1 in the following description
No. 3 is a description corresponding to the claim in the specification at the time of filing.
Although it was an example, the present invention described in the claims
Is a reference example, and corresponds to Examples 4 and 5.
This is recognized as a comparative example. Examples 1 and 2
As wood chips: paper chips: fiber chips = 50%: 25%: 25
% Crushed stone in a secondary combustion furnace of an industrial waste treatment furnace designed to incinerate mixed waste at a weight ratio of 80%: construction wood chips: waste plastic = 80%: 20% When the waste mixed by weight ratio was burned, the measurement test of various components such as the concentration of hydrogen chloride in the exhaust gas discharged from the chimney was performed. In addition, as a comparative example, construction wood chips: waste plastic = 8 in a state in which no porcelain stone was filled.
The same measurement test was performed for the case where the waste mixed at a weight ratio of 0%: 20% was burned. In addition, each test described below was carried out without disclosure. Also,
As Examples 1 and 2, two kinds of tests were performed in which the filling amount of the porcelain stone was changed.

First, the configuration of the industrial waste treatment furnace used for the measurement test will be described. This industrial waste treatment furnace
Maruhachi Co., Ltd. (Tahara-cho, Atsumi-gun, Aichi prefecture
281), and as shown in FIG. 2, a furnace main body 110, a secondary combustion furnace 120, a heat exchanger 130,
Cyclone 140, discharge blower 150, silencer 1
60 and a chimney 170. The industrial waste treatment furnace 101 is configured to control the secondary combustion burner installed in the secondary combustion furnace 20 so that the exhaust gas temperature is maintained at 800 ° C. or higher.

As a first embodiment, as shown in FIG. 1B, a basket 180 made of SUS316 is loaded in the middle of the secondary combustion furnace 120, and a porcelain stone (Shiraku Machida, Kitashitara-gun, Aichi Prefecture) is placed here. About 1.5 ton of crushed stone of quartz schist produced near No. 1 ridge-shaped step door was filled. Example 2
As a result, the crushed stone was filled also on the outlet side of the basket 180, and a measurement test was performed using about 7 ton of bonito stone. In the comparative example, combustion was performed in a state in which the porphyry stone was not filled in the secondary combustion furnace 120, and a measurement test such as the concentration of hydrogen chloride was performed.

First, the chemical components of the porphyry stone used in Examples 1 and 2 are shown in the following table.

[0031]

[Table 1]

In the first embodiment, the porcelain stone is used for about 40 m.
The crushed stone had a size of m square and was filled in a basket 80 set in the middle of the secondary combustion furnace 20. The filling amount is about 1.5 ton by weight. Further, in Example 2, the basket 80 was filled with the porcelain stone on the exit side, and the total amount was about 7 tons.
n prairie stones were used. In the second embodiment, about 40
Crushed stone having a size of about 150 mm square was used in addition to crushed stone having a size of mm square.

Next, wastes burned in the measurement test will be described. In both Examples and Comparative Examples, construction-based wood chips and waste plastic (mainly vinyl chloride) were mixed at a weight ratio of 8:
590 kg / h (4, 590 kg / h)
(720 kg / day), the reactor was charged into the furnace main body 110 for continuous operation, and various components were measured mainly on the concentration of hydrogen chloride in the exhaust gas discharged from the chimney 170 into the atmosphere. Table 2 shows the composition of the waste used, and Table 3 shows the measurement results. In addition, about Example 2, the measurement test of only hydrogen chloride concentration was performed.

[0034]

[Table 2]

[0035]

[Table 3]

As is apparent from Table 3 above, the secondary combustion furnace 1
When 20 is filled with crushed stones,
It can be confirmed that the content of hydrogen chloride in the exhaust gas is significantly reduced. Also, it can be confirmed that the hydrogen chloride content can be further reduced by increasing the filling amount. Furthermore, as is clear from the comparison between Example 1 and the comparative example, it can be confirmed that the generation amount of dioxins is also significantly reduced when filled with bonito stone. In these measurement tests, slaked lime was not sprayed, so to reduce hydrogen chloride and dioxins,
It is clear that the uranai stone filled in the secondary combustion furnace 120 is involved exclusively.

[0037] In Examples 1 and 2, after the test, the state of the porcelain stone in the secondary combustion furnace 120 was confirmed. Each crushed stone was in a brittle and weathered state. It was granular. However, even after it has been weathered, if the incineration of waste containing waste plastics etc. is continued while the bonafite is filled in the secondary combustion furnace, the concentration of hydrogen chloride in the exhaust gas will decrease. The effect of the reduction itself is maintained as such. In addition, it was also confirmed that there was a part that was not weathered in addition to the one that was weathered in this way. This non-weathered material was present at a site where oxygen hardly contacts. Therefore, as Example 3, a description will be given below of the result of a test performed using a crushed stone of porcelain stone in advance in an oxygen-free state.
The composition of the porphyry stone used in Example 3 is almost the same as that of Examples 1 and 2.

In the third embodiment, the same as in the first and second embodiments is used, in which crushed pearl stone used as a filler is charged into a vacuum heating furnace using an electric heater and fired in advance under vacuum. The test was performed. The firing conditions of the crushed stone are as follows: under vacuum, gradually raise the output of the furnace from room temperature to 1300 ° C. over 8 hours, hold at 1300 ° C. for 8 hours, and then gradually decrease the output of the furnace. A method of gradually cooling to room temperature over 3 days while the heating was performed was adopted. For this firing, crushed stone having a size of about 100 mm square was used. Visual observation of the surface condition of the crushed stone after firing revealed that more air bubbles were formed than before firing, and that the crushed stone itself was slightly expanded, indicating that the entire crushed stone was foamed. It is considered that it has become. on the other hand,
Although the whole was in a foamed state, it was confirmed that the porcelain stone fired under vacuum was harder than before firing and was not easily broken even when hit with a hammer. Therefore, it can be said that the calcination conditions for the crushed porcelain stone used as the filler in Example 3 are such that the porcelain stone can be foamed and hardened.

In this manner, the crushed stone of the porcelain stone previously fired under vacuum is put into the secondary combustion furnace 120 by weight of about 1.5.
When a test was conducted by incineration of the same waste as in Example 1 by filling with ton, it was confirmed that the concentration of hydrogen chloride in the exhaust gas was also significantly reduced. In the third embodiment, the concentration of hydrogen chloride in the exhaust gas discharged from the chimney was measured using a gas sensing tube SA type (for HCl) manufactured by Komei Rikagaku Kogyo Co., Ltd. Approximately 76m when converted to standard oxygen (12%) correction value in 1.
g / Nm ³ . Moreover, in Example 3, there was no change in the state of the porcelain stone after the test. Therefore, when the prefired material that has been pre-fired under vacuum so as to be in a foamed and hardened state is used as a filling material for the secondary combustion furnace, there is no change in the filling condition during subsequent continuous use, and It can be said that the contact state with the gas can be maintained in the same state. Therefore, the effect that the hydrogen chloride reduction effect can be maintained at a high level for a long period of time and the maintenance becomes easy is exhibited.

In the third embodiment, the firing conditions of heating and maintaining at 1300 ° C. under vacuum were employed.
Needless to say, the temperature may be within a temperature range in which a cured state can be obtained. In addition, it suffices to perform calcination in a state in which it is not brought into contact with oxygen. Considering that crushed stones that have not weathered in Examples 1 and 2 were partially present, calcination was performed under an inert gas instead of calcination under vacuum. The same effect can be expected even if it is performed.

Next, Example 4 and Example 5 in which cylindrical ceramics mainly composed of pearlite were filled in a secondary combustion furnace provided in an industrial waste treatment furnace to confirm the effect of reducing dioxins. Will be described. In Example 4 and Example 5, powder of porphyry stone, alumina and refractory clay, each having an average particle diameter of 400 μm, were prepared in a weight ratio of alumina: fire-resistant viscosity: porphyrite = 5:10: A mixture obtained by mixing water at a ratio of 85% with water at a ratio of 10% by weight was formed into a cylindrical shape, and this was sintered at 1150 ° C. in a vacuum heating furnace to obtain a cylindrical ceramic. Used as packing for Then, this cylindrical ceramic (outer diameter = 60 m) is placed in a cylindrical secondary combustion furnace.
(m, inner diameter = 40 mm, length = 300 mm) were filled without gaps in a state where the flow direction of the exhaust gas after secondary combustion and the cylindrical hole were matched, and an experiment was performed under the following conditions. In addition, all the experiments were performed without disclosure. In addition, the component composition of the pearlite used in Examples 4 and 5 is almost the same as that of Examples 1 and 2.

In the fourth embodiment, as shown in the schematic diagram of FIG. 3A, Seibu Machine Co., Ltd. (Maruko-cho, Shizuoka-shi, Shizuoka)
A secondary burner and a catalytic device are installed in a small incinerator owned by the company, and a filler mainly composed of porphyrite made into a cylindrical ceramic is filled into the catalytic device with the cylindrical holes aligned with the passage direction of the combustion gas. At the same time, urethane, ABS resin, acrylic, polypropylene,
A mixture of sandal scraps, wood chips, paper chips, and styrene was charged at a rate of 250 kg / hour, and a combustion experiment was conducted for 6 hours. In this embodiment 4,
An experiment was conducted by filling 116 cylindrical ceramics into the secondary combustion furnace without gaps. In addition, the fifth embodiment is different from FIG.
As shown in the schematic diagram of (B), a small incinerator with a secondary combustion furnace owned by Bridgestone Chemicals Chubu Co., Ltd. (Komaki City, Aichi Prefecture) was used, and cylindrical ceramics were formed in the secondary combustion furnace. Filling was carried out with a filling mainly composed of raisou stone with the cylindrical hole aligned with the direction of passage of the combustion gas, and urethane foam was charged as waste into the primary combustion furnace at a rate of 350 kg / hour. A combustion experiment was conducted over time. In Example 4, an experiment was conducted by filling 224 cylindrical ceramics into the secondary combustion furnace without any gap. Table 4 shows the results of these experiments.

[0043]

[Table 4]

As is evident from the experimental results in Table 4, according to Examples 4 and 5 in which the porcelain stone was made into a cylindrical ceramic, compared to Examples 1 and 2,
The concentration of hydrogen chloride in the exhaust gas can be further reduced, and in particular, the generation of dioxins in the exhaust gas can be extremely reduced. In addition, Examples 1 to
Example 3 corresponds to the claimed invention at the beginning of the application
What corresponds to the current claim,
Fourth and fifth embodiments.

[0045]

As described above, according to the present invention, hydrogen chloride in exhaust gas can be greatly reduced, and a great effect is also achieved in reducing dioxins generated from hydrogen chloride. .

In particular, as described in the claims, porcelain stone powder
The cylindrical ceramics obtained by molding the powder into a cylindrical shape and sintering
Dioxins in exhaust gas by filling in furnace
Can be extremely reduced. Also, the cylindrical cell
Lamix changes its shape even after long-term use
No maintenance and easy maintenance
In terms of the best.

[0047]

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of an industrial waste treatment facility according to an embodiment.

FIGS. 2A and 2B show a configuration of an industrial waste treatment furnace used for a measurement test, in which FIG. 2A is a schematic diagram of the whole, and FIG. 2B is a plan view showing a part of a secondary combustion furnace.

3A and 3B show the configuration of an industrial waste treatment furnace used in a measurement test, wherein FIG. 3A is a schematic diagram of a furnace used in Example 4, and FIG. 3B is a schematic diagram of a furnace used in Example 5. .

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Industrial waste treatment facility, 10 ... Furnace body, 20
... Secondary combustion furnace, 21 ... Basket, 23 ...
Crushed stone, 30: heat exchanger, 40: cyclone, 5
0: second heat exchanger, 60: slaked lime spraying device,
70: bag filter, 80: discharge blower, 9
0: silencer, 100: chimney.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-71176 (JP, A) JP-A-4-41930 (JP, U) JP-A-48-106979 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) F23G 5/16 ZAB F23G 5/18 ZAB F23G 7/06 ZAB

Claims (4)

(57) [Claims] 1. A secondary combustion furnace provided continuously with a furnace body of a waste treatment facility, wherein quartz schist is provided in a region between a region for performing secondary combustion and an outlet of a secondary combustion gas. It is provided with a packing layer filled with a large number of packings made from a kind of porcelain stone , wherein the filling is the porcelain stone
The powder obtained by pulverizing is molded into a cylindrical shape using the main
A secondary combustion furnace for a waste treatment facility, wherein the secondary combustion furnace is a cylindrical ceramic hardened by a process. 2. A secondary combustion furnace for a waste treatment facility according to claim 1 , wherein said cylindrical ceramics contains 70% to 90% by weight of said burlapite powder. Secondary combustion furnace for waste treatment facilities. 3. A furnace body for charging and burning waste,
A waste treatment facility comprising: a secondary combustion furnace provided continuously with an exhaust gas outlet of the furnace main body, wherein a secondary combustion gas generated in the secondary combustion furnace is maintained at a temperature of 800 ° C. or higher. even the Horai stone is a kind of quartz schist configured as pass a layer of packing a raw material
And the filler is a powder obtained by crushing a porcelain stone
Formed into a cylindrical shape using as a main raw material and cured by sintering
A secondary combustion furnace for a waste treatment facility, wherein the secondary combustion furnace is shaped like a ceramic . 4. A filling material for a secondary combustion furnace which reduces hydrogen chloride in a combustion gas by filling the secondary combustion furnace in a waste treatment facility. A filling material for a secondary combustion furnace, which is a cylindrical ceramic formed into a cylindrical shape by using a powder obtained by pulverization as a main raw material and hardened by sintering.