JPH11325454A - Waste processing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assure satisfactory dioxin reduction effect due to a dioxin reduction catalyst upon incinerating and reducing dust discharged from a home in a dust processing apparatus in which a waste gas passage is connected to an incinerator including a combustion chamber for combusting waste for guiding waste gas from the combustion chamber. SOLUTION: A dioxin reduction catalyst 30 is interposed in the course of a waste gas passage 27 for removing dioxin in waste gas. Herein, a control unit 34 controls the operation such that although a catalyst heater 31 capable of heating the dioxin reduction catalyst 30 heats the dioxin reduction catalyst 30 up to set temperature before dust 15 in a combustion chamber 16 is fired, the heating is interrupted after completion of the firing of the dust 15 in the combustion chamber 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refuse treatment apparatus for incinerating and reducing refuse discharged from homes and the like.

[0002]

2. Description of the Related Art In recent years, the problem of dioxins generated by incineration of refuse has been highlighted, and measures have been taken to suppress the generation of dioxins, such as raising the combustion temperature of refuse to 1000 ° C. or higher. In order to raise the temperature inside the incinerator, it is necessary to completely remodel the inside of the incinerator as large as a large furnace.

On the other hand, for example, Japanese Patent Application Laid-Open No. Sho 63-290314
As disclosed in Japanese Patent Laid-Open Publication No. H10-107, the use of a dioxin-reducing catalyst for reducing dioxin in flue gas has already been put into practical use.If such a dioxin-reducing catalyst is used, a small incinerator for home use can be used. However, the generation of dioxins can be suppressed without performing a complete remodeling of the furnace.

[0004]

In order to obtain the dioxin reduction effect of the dioxin reduction catalyst, it is necessary to limit the temperature of the exhaust gas in contact with the dioxin to a predetermined range. When the refuse is continuously burned, the temperature of the combustion exhaust gas can be controlled to be substantially constant, so that a sufficient dioxin reduction effect by the dioxin reduction catalyst can be obtained. However, in small incinerators that incinerate garbage discharged from homes, etc., the amount of garbage is not so large, so the combustion time is relatively short, and garbage combustion is completed before the flue gas temperature stabilizes. In some cases, simply using a dioxin reducing catalyst cannot provide a sufficient dioxin reducing effect.

[0005] The present invention has been made in view of such circumstances, and a refuse treatment apparatus capable of obtaining a sufficient dioxin reduction effect by a dioxin reduction catalyst when incinerating and reducing refuse discharged from homes and the like. The purpose is to provide.

[0006]

According to a first aspect of the present invention, an incinerator having a combustion chamber for burning refuse is provided with an exhaust gas passage for guiding exhaust gas from the combustion chamber. In a rubbish treatment apparatus, a dioxin reducing catalyst interposed in the exhaust gas passage to remove dioxin in exhaust gas, a catalyst heater capable of heating the dioxin reducing catalyst, and ignition of waste in the combustion chamber A control unit that controls the catalyst heater by heating the dioxin-reducing catalyst to a set temperature before, but stopping the heating of the dioxin-reducing catalyst after the completion of the ignition of the refuse in the combustion chamber. .

According to this configuration, the dioxin-reducing catalyst is heated to the set temperature by the catalyst heater before the ignition of the refuse. It is possible to obtain a sufficient dioxin reduction effect, and since the heating of the dioxin reduction catalyst by the catalyst heater is stopped after the ignition of the refuse, even if the exhaust gas temperature rises with the progress of combustion, the dioxin reduction catalyst can be used. The temperature does not rise excessively, and the dioxin can be effectively reduced while the temperature of the dioxin reducing catalyst is stably maintained by the exhaust gas temperature.

[0008] The invention according to claim 2 provides the above-mentioned claim 1.
In addition to the configuration of the invention described in the above, the catalyst heater, which is a panel electric heater, is housed in a casing filled with the dioxin reduction catalyst so as to surround the dioxin reduction catalyst. If this is the case, the entire dioxin-reducing catalyst in the portion surrounded by the catalyst heater can be effectively heated.

According to a third aspect of the present invention, in addition to the configuration of the second aspect, the catalyst heater is housed at an outlet side of the casing, avoiding an inlet side of the casing. According to the configuration, the temperature of the dioxin reducing catalyst at the outlet side of the casing is high in the early stage of the combustion of the refuse,
The temperature of the dioxin reducing catalyst on the inlet side is low, and the temperature of the dioxin reducing catalyst on the outlet side of the casing is reduced due to the heat transfer from the exhaust gas accompanying the combustion of waste to the dioxin reducing catalyst on the inlet side. Does not rise excessively. In addition, as the combustion of the refuse proceeds, the temperature of the dioxin reducing catalyst increases at the inlet side of the casing. At this time, since the heating by the catalyst heater is stopped, the dioxin reducing catalyst at the outlet side. , The dioxin reducing catalyst housed in the casing is stably maintained as a whole in a predetermined temperature range, and a sufficient dioxin reducing effect can be obtained.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the incinerator can supply refuse and supply air from above. An incinerator main body provided such that a tapered surface constituting a lower side surface of the combustion chamber which can be blocked has a smaller diameter as it faces downward; a plurality of air supply nozzles provided on the tapered surface; Air control means for supplying air from a nozzle; and an ignition heater disposed in a lower portion of the combustion chamber, wherein the control unit heats dust for a predetermined time by the ignition heater; After the completion of the heating process, the air supply unit supplies combustion air from each air supply nozzle to the combustion chamber to ignite the refuse, and starts the air supply by the air supply unit. And executes the heating stop process of stopping the heating by the catalytic heater and the ignition heater.

According to the configuration of the invention described in claim 4, it is possible to ignite dust near the tapered surface, and it is possible to gently burn the compressed dust pressed against the tapered surface. By supplying air necessary for ignition after heating, more reliable ignition of dust and stable start of combustion in the combustion chamber can be made possible. Moreover, since the heating by the catalyst heater and the ignition heater is stopped in accordance with the ignition of the dust by the start of the air supply, the control of both heaters is simple and the handling is easy.

According to a fifth aspect of the present invention, in addition to the configuration of any one of the first to fourth aspects of the present invention, the control unit may further include a control unit configured to control the air supply nozzle from each air supply nozzle at the end of the combustion of dust in the combustion chamber. According to such a configuration, sufficient air is supplied to the combustion chamber at the end of combustion of the refuse to prevent the generation of unburned air. In addition, it is possible to prevent the temperature of the combustion exhaust gas from excessively rising, and to obtain a sufficient dioxin reduction effect by the dioxin reduction catalyst even at the end of combustion.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a view showing the entire configuration of a waste treatment apparatus including an incinerator, and FIG. 2 is a sectional view taken along line 2-2 in FIG. FIG. 3 is a control timing chart of the ignition heater, the catalyst heater, and the sirocco fan, and FIG. 4 is a diagram showing a temperature change of the dioxin reducing catalyst on the outlet side.

First, referring to FIG.
An incinerator 5 and a catalytic converter 6 for reducing dioxin in exhaust gas from the incinerator 5 are provided.

2, the incinerator main body 7 of the incinerator 5 has a box base 8 formed in a rectangular box shape and a tapered box shape having a smaller diameter as it goes upward. A rising pipe portion 9 rising from a substantially central portion of the base 8, and an outer tapered portion 10 having a lower end continuously provided on an outer surface of a vertically intermediate portion of the rising pipe portion 9 and having a larger diameter as it goes upward.
A cylindrical portion 11 having a lower end connected to an upper end of the outer tapered portion 10 and extending upward; and a tapered shape having a larger diameter as going upward, and the outer tapered portion 10
And an inner tapered portion 12 fixedly arranged on the inner side of
The lower end of the inner tapered portion 12 is fixed to the upper end of the riser tube portion 9, and the upper end of the inner tapered portion 12 is fixed to the inner surface of the cylindrical portion 11.

In such an incinerator main body 7, the upper end opening of the cylindrical portion 11 is provided with a refuse inlet 1 into the incinerator main body 7.
The dust input port 13 is opened to function as 3, and can be closed by a lid member 14 that can be opened and closed.

A combustion chamber 16 is formed in the incinerator main body 7 for incinerating waste 15 introduced from a waste inlet 13. The combustion chamber 16 is formed on the inner surface of the inner tapered portion 12. The tapered surface 12a is formed in a shape narrowing downward with the lower side surface. Moreover, the combustion chamber 16
Has an outlet 17 at the lower end thereof.
7 is formed by the lower end of the tapered surface 12a. Further, by closing the dust inlet 13 with the lid member 14, air supply to the combustion chamber 16 from above is prevented.

An auxiliary combustion chamber 18 is formed in the riser pipe 9 so as to have a flow area larger than the opening area of the outlet 17 below the outlet 17.

An annular air chamber 19 is formed between the lower part of the outer taper part 10 and the cylindrical part 11 and the upper part of the riser pipe part 9 and the inner taper part 12. The plurality of first air supply nozzles 20 that are communicated with each other,
Are arranged on the tapered surface 12a to supply combustion air to the combustion chamber 16, and a plurality of second air supply nozzles 21, 21.
In order to supply combustion air to the riser 8, the riser pipe 9 is disposed.

The first air supply nozzles 20, 20
.. Are for supplying combustion air to the combustion chamber 16 so as to burn the refuse 15 in the combustion chamber 16 gently, and have a relatively large diameter in FIGS. 1 and 2 for easy understanding. Although depicted, it is actually formed with a relatively small diameter. The plurality of second air supply nozzles 21, 21,...
An amount of combustion air exceeding the total amount of combustion air supplied from the plurality of first air supply nozzles 20, 20,.
8 from the common air chamber 19
The inner diameter of the first air supply nozzles 20, 20,... And the second air supply nozzles 21, 20, so that the amount of air distribution to the air supply nozzles 20, 20,. 21 are set respectively.

Moreover, a plurality of first air supply nozzles 20, 2
.. Are arranged on the tapered surface 12a in such a manner that the injection direction is aligned with the direction in which the air supplied from the air supply nozzles 20, 20 ... into the combustion chamber 16 is swirled along the tapered surface 12a. A plurality of second air supply nozzles 21 and
Are arranged in the riser pipe section 9 in such a manner that the injection direction is aligned with the direction in which the air supplied from the second air supply nozzles 21, 21, ... is swirled along the inner surface of the auxiliary combustion chamber 18.

A discharge port 22a of a sirocco fan 22 as an air supply means is connected to the air chamber 19, and a plurality of first air supply nozzles 20, 20,.
Are supplied with air from the common sirocco fan 22. Moreover, in order to generate swirling airflow in the same direction as the airflow swirling direction from the first air supply nozzles 20, 20,... And the second air supply nozzles 21, 21,. The sirocco fan 22 is connected to the outer tapered portion 10 so that the air discharge direction substantially coincides with the tangential direction of 19. Thus, the sirocco fan 22
By changing the supply voltage, it is possible to change the air volume.

The dust 15 in the combustion chamber 16 is compressed by the weight 23 and pressed against the tapered surface 12a.
The weight 23 is formed in a circular cross-section having an outer surface close to and opposed to the inner surface of the cylindrical portion 11, and moves up and down so that the lower end position is regulated by the upper end of the tapered surface 12a. It is stored in the cylindrical part 11 as much as possible.

Under the tapered surface 12a, a three-dimensional lattice-shaped roster 2 extending upward covering the outlet 17 of the combustion chamber 16 is provided.
4 is attached with its basic outer shape as a truncated cone, and a plurality of openings 2 provided in the
The opening areas of the openings 25 are smaller than the opening area of the outlet 17, but the total opening area of all the openings 25 is smaller than the opening area of the outlet 17. Is also formed to be large.

An ignition heater 26, which is an electric heater, is provided at a lower portion in the combustion chamber 16. This ignition heater 26
Is formed by housing a heat-generating element such as a nichrome wire in a pipe made of a heat-resistant and corrosion-resistant material such as stainless steel, and formed, for example, in a substantially circular arc shape along the tapered surface 12a. And is fixed to the inner tapered portion 12 by a pair of support arms 26a, 26a penetrating through the inner tapered portion 12.

The combustion exhaust gas from the combustion chamber 16 and the auxiliary combustion chamber 18 in the incinerator 5 is discharged to the outside via an exhaust gas passage 27.
An upstream passage portion 27a formed in the box-shaped base portion 8 and a downstream passage portion 27b formed in the exhaust gas conduit 28. The catalytic converter 6 is disposed between the upstream passage portion 27a and the downstream passage portion 27b. It is interposed.

The catalytic converter 6 has a casing 29 filled with a dioxin reducing catalyst 30 and a catalyst heater 31 for heating a part of the dioxin reducing catalyst 30. The casing 29 formed into a cylindrical shape by squeezing the inlet 32 and the outlet 33 at the upper end is erected from the box-shaped base 8 so as to connect the inlet 32 to the upstream passage 27a. Is connected to an exhaust gas conduit 28.

The dioxin reducing catalyst 30 is, for example, an oxidizing catalyst in which a platinum catalyst is supported on a ceramic carrier, and is, for example, 150 to 280 ° C., preferably 180 to 2 ° C.
By contacting with exhaust gas in a temperature range of 50 ° C., it exhibits a function of reducing dioxin in the exhaust gas.

The catalyst heater 31 is a panel electric heater, and is housed in the casing 29 so as to surround the dioxin reduction catalyst 30. Moreover, the catalyst heater 31
The casing 2 does not surround the dioxin reducing catalyst 30 on the inlet 32 side of the casing 29, but surrounds the dioxin reducing catalyst 30 on the outlet 33 side of the casing 29.
9 is stored.

Incidentally, the ignition heater 26, the catalyst heater 31 and the sirocco fan 22 are controlled by a control unit 34. As shown in FIG.
Heats the dust 15 by the ignition heater 26 for a predetermined time and heats the dioxin reduction catalyst 30 by, for example, 150 ° C. by the catalyst heater 31 for a predetermined time,
After the heating process by the ignition heater 26 and the catalyst heater 31 is completed, the operation of the sirocco fan 22 is started. When the operation of the sirocco fan 22 is started, combustion air is started from the first air supply nozzles 20, 20,... To the combustion chamber 16, and the dust 15 in the combustion chamber 16 is discharged by the ignition heater 2.
Since the sirocco fan 22 is heated, the dust 15 is reliably ignited when the sirocco fan 22 starts operating. Further, the control unit 34 stops the heating process by the ignition heater 26 and the catalyst heater 31 at the start of the operation of the sirocco fan 22, and increases the discharge air volume of the sirocco fan 22 by the increase of the supply voltage at the end of the combustion. The air supply nozzles 20, 20,... And the second air supply nozzles 21, 21,.
The amount of air supplied to the combustion chamber 16 and the auxiliary combustion chamber 18 from the air is increased.

Next, the operation of this embodiment will be described. When the waste 15 is incinerated and reduced in the incinerator 5, the waste 1 introduced into the combustion chamber 16 from the waste inlet 13 is reduced.
5 and the refuse inlet 13
Is sealed with a lid 31. Thus, the waste 1 in the combustion chamber 16
5 is pressed against the tapered surface 12a while being compressed by the weight 23.

In this state, first, the heating of the dust 15 by the ignition heater 26 and the heating of the dioxin reducing catalyst 30 by the catalyst heater 31 are started. At this time, since the ignition heater 26 is arranged at an inwardly spaced position along the tapered surface 12a, the dust 15 contacts the ignition heater 26 over a relatively wide range relatively near the tapered surface 12a. Thus, a relatively wide range of dust 15 can be heated as the surface temperature of the ignition heater 26 rises. Moreover, the refuse input port 13 by the lid member 14
The air supply from above to the combustion chamber 16 is blocked by the hermetic seal, and the air supply is insufficient.
The refuse 15 in 6 does not burn up at a stretch, and smoke is not discharged outside.

The ignition heater 26 and the catalyst heater 31
After the heating for the set time, the operation of the sirocco fan 22 is started, and the refuse 15 having reached the ignition temperature is more reliably ignited by the supply of air to the combustion chamber 16. Moreover, the supply of air to the combustion chamber 16 is controlled by the tapered surface 1.
2a, a plurality of first air supply nozzles 20, 20
, And the combustion air can be effectively supplied to the vicinity of the ignition heater 26, so that the ignition of the dust 15 becomes more reliable and the tapered surface 12 of the dust 15
A stable start of combustion in the vicinity of "a" becomes possible.

After the refuse 15 is ignited, the combustion chamber 16
The refuse 15 which is in a compressed state in the inside continues gradual combustion near the tapered surface 12a by a relatively small amount of combustion air supplied from the first air supply nozzles 20, 20,. The generated incomplete combustion gas is supplied to the combustion chamber 1
6 flows into the auxiliary combustion chamber 18, and is burned with a higher complete burnup by a sufficient amount of combustion air supplied from the second air supply nozzles 21, 21. .

In order to stably maintain gentle combustion in the combustion chamber 16, it is necessary to reliably supply air to the combustion portion near the tapered surface 12a at an appropriate supply speed.
Thus, the combustion air is not supplied from above the combustion chamber 16, and the plurality of first air supply nozzles 20, 20.
, The combustion air supplied into the combustion chamber 16 from 0... Is arranged with the injection direction aligned so as to swirl along the tapered surface 12a, so that combustion is performed at a speed required to maintain gradual combustion. It is possible to supply the working air to the combustion portion near the tapered surface 12a. Moreover, the combustion chamber 16
By generating a swirling flow of air in the inside, the gas retention time in the combustion chamber 16 can be made relatively long, and the occurrence of uneven combustion in the combustion chamber 16 can be suppressed as much as possible.

The auxiliary combustion chamber 18 has a flow area larger than the opening area of the outlet 17 at the lower end of the combustion chamber 16 and is continuous with the combustion chamber 16. At the outlet 1 of the combustion chamber 16
7, the gas flow is restricted, and even if combustion unevenness occurs in the combustion chamber 16, the incomplete combustion gas and smoke and the high-temperature gas generated by complete combustion are effectively removed at the outlet 17. The second air supply nozzles 21 and 21 are mixed.
Are supplied to the auxiliary combustion chamber 18 toward the mixed gas from the outlet 17, so that combustion with a higher complete burnup can be achieved.

Furthermore, since the first air supply nozzles 20, 20,... And the second air supply nozzles 21, 21,... Are supplied with pressurized air from the common sirocco fan 22, adjustment of the necessary air amount is simple. It is possible to contribute to the reduction of the number of parts while enabling the sirocco fan 22. Also, by setting the inner diameters of the plurality of first air supply nozzles 20, 20, ... and the inner diameters of the plurality of second air supply nozzles 21, 21, ..., the amount of air supplied from a single sirocco fan 22 is reduced. A relatively small amount of air to the side and a relatively large amount of air to the auxiliary combustion chamber 18 can be easily distributed, and complicated air supply amount control is not required.

By the way, when ash generated by combustion in the combustion chamber 16 or incompletely burned material which has become brittle due to the progress of combustion to some extent falls by gravity, the outlet 17 of the combustion chamber 16 If it is blocked, the flow of the supply air and the combustion gas in the combustion chamber 16 is disturbed, and the combustion becomes unstable even temporarily. However, the tapered surface 12a
At the lower part of the housing is mounted a three-dimensional lattice-shaped rostrette 24 extending upward to cover the outlet 17.
Are larger than the opening area of the outlet 17, and each of the openings 25, 25,.
Are smaller than the opening area of the outlet 17. Therefore, of the ash, incompletely burned substances, etc., which have fallen, those larger than the opening area of
7 can be temporarily stopped around the roster 24 in a range wider than the opening area of the nozzle 7. At this time, since the total opening area of each of the openings 25, 25. There is no. The ash and incompletely combusted materials, which have become smaller than the openings 25, 25...
, But the opening area of each of the openings 25 is smaller than the opening area of the outlet 17, so that the outlet 17 is not blocked by the falling objects, and the supply air in the combustion chamber 16 Further, it is possible to prevent the flow of the combustion gas from being disturbed and to maintain more stable combustion.

In such an incinerator 5, the waste 15
Is continuously burned little by little in the vicinity of the tapered surface 12a, so that the amount of heat generated per unit time does not increase. Therefore, it is possible to prevent the incinerator main body 7 from becoming high temperature and to use the incinerator at home or the like. The restriction on the installation location accompanying the high temperature of 5 can be eliminated. In addition, the gradual continuation of the combustion of the refuse 15 suppresses the amount of combustion gas generated per unit time, and the sufficient supply of combustion air suppresses the generation of unburned gas as much as possible. It becomes possible to clean. Therefore, the incinerator 5 can be installed in each household with almost no problem, and the garbage 15 is incinerated so that the garbage 15 is disposed of frequently every time the garbage 15 comes out. It is possible to reduce the weight.

The combustion exhaust gas discharged from the incinerator 5 is introduced into the catalytic converter 6, and the dioxin reduction catalyst 30 filled in the catalytic converter 6 effectively reduces the dioxin in the exhaust gas. Moreover, since the dioxin reducing catalyst 30 is heated to the set temperature by the catalyst heater 31 before the refuse 15 is ignited, even if the exhaust gas temperature at the start of combustion of the refuse 15 due to the ignition is low, the dioxin reducing catalyst 30 can sufficiently reduce the dioxin. It is possible to obtain the effect, and since the heating of the dioxin reducing catalyst 30 by the catalyst heater 31 is stopped after the refuse 15 is ignited, even if the temperature of the exhaust gas rises with the progress of combustion, the dioxin reducing catalyst 30 is not heated. The temperature does not rise excessively, and the dioxin can be effectively reduced while the temperature of the dioxin reducing catalyst 30 is stably maintained by the exhaust gas temperature.

The catalyst heater 31, which is a panel electric heater, is housed in the casing 29 filled with the dioxin reducing catalyst 30 so as to surround the dioxin reducing catalyst 30, so that a portion surrounded by the catalyst heater 31 is provided. The dioxin reduction catalyst 30 as a whole can be effectively heated.

In addition, the catalyst heater 31 is
9 is stored at the exit 33 side avoiding the entrance 32 side,
As shown in FIG.
The temperature of the dioxin reducing catalyst 30 at the outlet 33 side of
Although the temperature is raised by raising the temperature to 150 ° C. by the catalyst heater 31, for example, the temperature of the dioxin reducing catalyst 30 at the inlet 32 side is low,
Inlet 32 from exhaust gas generated by combustion of refuse 15
The heat is transferred to the dioxin reducing catalyst 30 on the side, so that the dioxin reducing catalyst 30
Temperature does not rise excessively. Further, as the combustion of the refuse 15 proceeds, the temperature of the dioxin reducing catalyst 30 increases on the inlet 32 side of the casing 29,
At this time, since the heating by the catalyst heater 31 is stopped, the temperature of the dioxin reducing catalyst 30 decreases on the outlet 33 side, and the dioxin reducing catalyst 30 housed in the casing 29 becomes, for example, as a whole, for example. 1
The temperature is stably maintained in the predetermined temperature range of 80 to 250 ° C., and a sufficient dioxin reduction effect can be obtained.

Since the heating by the catalyst heater 31 and the ignition heater 26 is stopped in response to the ignition of the dust 15 by the start of air supply, the control of the heaters 31 and 26 is simple, and the handling is easy.

Further, at the end of combustion of the refuse 15 in the combustion chamber 16, the amount of air supply increases, so that sufficient air is supplied to the combustion chamber 16 at the end of combustion to prevent the generation of unburned residue and to prevent combustion. Excessive rise in the temperature of the exhaust gas can be prevented, and a sufficient dioxin reduction effect by the dioxin reduction catalyst 30 can be obtained even at the end of combustion.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0047]

As described above, according to the first aspect of the present invention, even if the temperature of exhaust gas at the start of combustion of refuse by ignition is low, a sufficient dioxin reduction effect can be obtained by the dioxin reduction catalyst, and the progress of combustion can be improved. Accordingly, even if the exhaust gas temperature increases, the temperature of the dioxin reducing catalyst does not excessively increase, and dioxin can be effectively reduced.

According to the second aspect of the present invention, the entire dioxin reducing catalyst in the portion surrounded by the catalyst heater can be effectively heated.

According to the third aspect of the present invention, the dioxin reducing catalyst housed in the casing can be stably maintained as a whole in a predetermined temperature range, and a sufficient dioxin reducing effect can be obtained.

According to the fourth aspect of the present invention, it is possible to reliably ignite the dust near the tapered surface, to burn the dust slowly, and to start stable combustion. In addition, control of both heaters is simplified, and handling is also facilitated.

Further, according to the fifth aspect of the present invention, sufficient air is supplied to the combustion chamber at the end of combustion of the refuse to prevent unburned fuel from being generated and to prevent the temperature of the flue gas from excessively rising. Thus, a sufficient dioxin reduction effect by the dioxin reduction catalyst can be obtained even at the end of combustion.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an entire waste disposal apparatus including an incinerator.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a control timing chart of an ignition heater, a catalyst heater, and a sirocco fan.

FIG. 4 is a diagram showing a temperature change of a dioxin reduction catalyst on an outlet side.

[Explanation of symbols]

 Reference numeral 15: Garbage 16: Combustion chamber 5: Incinerator 27: Exhaust gas passage 30: Dioxin reduction catalyst 31: Heater for catalyst 34: Control unit 29: Casing 32: ..Inlet 33 ・ ・ ・ Outlet 12a ・ ・ ・ Tapered surface 7 ・ ・ ・ Incinerator body 20 ・ ・ ・ Air supply nozzle 22 ・ ・ ・ Sirocco fan 26 as air supply means 26 ・ ・ ・ Ignition heater

Claims (5)

[Claims] 1. A combustion chamber for burning refuse (15).
In an incinerator (5) having an exhaust gas passage (27) for introducing exhaust gas from the combustion chamber (16), the waste treatment device is connected to the incinerator (5) in the exhaust gas passage (27) in order to remove dioxin in the exhaust gas. A dioxin-reducing catalyst (30), a catalyst heater (31) capable of heating the dioxin-reducing catalyst (30), and the combustion chamber (1).
Before the ignition of the refuse (15) in 6), the dioxin reducing catalyst (30) is heated to a set temperature, but the combustion chamber (16) is heated.
And a control unit (34) for controlling the catalyst heater (31) so as to stop heating the dioxin reduction catalyst (30) after the completion of the ignition of the waste (15). . 2. The catalyst heater (31), which is a panel electric heater, is housed in a casing (29) filled with the dioxin reducing catalyst (30) so as to surround the dioxin reducing catalyst (30). The refuse treatment apparatus according to claim 1, wherein: 3. The catalyst heater (31) is provided at an outlet (33) avoiding an inlet (32) side of the casing (29).
The refuse treatment apparatus according to claim 2, wherein the refuse disposal apparatus is stored on the side. 4. The incinerator (5) has a tapered surface (12a) forming a lower side surface of a combustion chamber (16) capable of charging dust (15) and preventing supply of air from above. ) Is provided in such a manner that the diameter of the incinerator becomes smaller toward the bottom, and the tapered surface (12)
a) a plurality of air supply nozzles (20), air supply means (22) for supplying air from each air supply nozzle (20), and a lower part in the combustion chamber (6). The control unit (34) is provided with a waste (1) by the ignition heater (26).
5) heating for a predetermined time, and after completion of the heating, supplying air for combustion from each air supply nozzle (20) to the combustion chamber (16) by the air supply means (22). And a heating stop process for stopping the heating by the catalyst heater (31) and the ignition heater (26) in accordance with the start of the air supply by the air supply means (22). The refuse treatment apparatus according to claim 1. 5. The air supply means (34) increases the amount of air supplied from each air supply nozzle (20) at the end of combustion of dust (15) in the combustion chamber (16). The refuse treatment apparatus according to any one of claims 1 to 4, wherein the operation of (22) is controlled.