JPH06147442A - Refuse incinerating facility - Google Patents

Abstract

PURPOSE:To protect a refuse incinerator from corrosion and enhance higher temperature and higher pressure operation for a boiler. CONSTITUTION:A drying stoker 4, a pre-combustion stoker 5 and a post- combustion stoker 6 are installed in the order of drying, ignition and combustion in an attempt to carry the refuse supplied from a refuse supply machine 2. The drying stoker 4 is provided with a first duct 10, which introduces combustion gas mainly from the pre-combustion stoker 5 to a steam generator 17 and a second duct 11, which introduces combustion gas mainly from the post- combustion stoker 6 to a steam heater 15. The greater pars of corrosion components are contained in the combustion gas from the previous stage, but the metal temperature is low and the area which allows the combustion gas to be introduced into the first duct 10, is not affected by high temperature corrosion. It is also possible to introduce the combustion gas from the rear stage which contains no corrosion component to the steam heater whose metal temperature is increased to a high temperature. Prevention of high temperature corrosion makes it possible to obtain high temperature an high pressure steam and enhance the efficiency of a boiler when generating power.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a refuse incineration facility,
In particular, the present invention relates to a refuse incineration facility having a combustion zone for carrying waste and burning it continuously, and a duct for exhausting combustion gas generated from the combustion zone.

[0002]

2. Description of the Related Art Conventionally, a fixed bed type, a moving bed type, a fluidized bed type, etc. have been used as a combustion system in a refuse incineration facility. In each of them, after combustion is performed in one or a plurality of combustion chambers, combustion gas is taken out from one exhaust port. Combustion gas has a large amount of heat, and in some refuse incinerators, heat is recovered by a boiler or the like provided in the combustion gas discharge path and used as a power source or heat supply source. In the case of power generation, in order to increase power generation efficiency, it is desirable to make the steam as hot and high pressure as possible.

By the way, in the garbage, chlorine compounds, sulfur compounds and the like are mainly mixed in salt, vinyl chloride and the like. These components are formed as gaseous compounds of chlorine and sulfur by combustion in the combustion chamber, are contained in the combustion gas, and are released outside the combustion chamber. In the case of the combustion gas containing these corrosive components, when the metal temperature in contact with the combustion gas is about 150 ° C. or less, low temperature corrosion is likely to occur on the metal surface, and at about 330 ° C. or more, high temperature corrosion is likely to occur on the metal surface.
High temperature corrosion progresses rapidly from the position. Therefore, it is necessary to take measures against corrosion in a boiler that recovers heat.
The design was carried out to avoid the above metal temperatures, and the steam condition was restricted to about 30 atm / 300 ° C. on the high temperature side. Therefore, when performing power generation using steam, the power generation efficiency was about 10 to 18%.

In order to raise the steam condition in order to raise the power generation efficiency, there is a measure to change the material of the boiler to one having higher corrosion resistance, but the equipment is soaring and its adoption is difficult.

On the other hand, suppression of nitrogen oxides as an air pollutant is required. In combustion, it is known that reducing combustion air results in less nitrogen oxides. Further, in order to reduce the heat loss from the chimney and to keep the combustion zone at a high temperature in order to suppress the generation of dioxins, it is desired to reduce the combustion air. However, the combustion gas that is low in oxygen becomes a reducing atmosphere and further promotes the corrosion of the metal surface. Thus, even in reducing nitrogen oxides, new restrictions have arisen from the problem of corrosion.

Further, in order to improve the heat recovery efficiency, it is desirable to keep the temperature of the water in the economizer of the boiler device as low as possible, but at a pipe temperature of 150 ° C. or lower, electrical low temperature corrosion due to hydrochloric acid, nitric acid, etc. There was also a restriction that it was necessary to keep the inlet temperature of the cooling water for the economizer to be higher than that.

[0007]

By the way, dust is composed of various substances having different properties and sizes, and the combustion completion time of them is also different. Therefore, in order to perform sufficient combustion, the material having the longest combustion time is dominated.

If the shape is small, the ignition point is low, the decomposition temperature is low, etc., the combustion is completed at the early stage of combustion. 200 ~ 450 melting and decomposition of plastics
Finish at about ℃. In particular, plastics containing chlorine-based substances decompose and release chlorine gas in a short time at about 400 ° C. Further, synthetic rubber containing a sulfur compound is also decomposed at a low temperature and becomes sulfurous acid gas or the like, which is released into the combustion gas. After these components are released, combustion continues on the combustion zone at a higher combustion temperature and ends combustion.

In various conventional combustion methods, after the drying, decomposition and combustion are carried out in one or a plurality of combustion chambers, and the combustion gas is taken out from one exhaust port, the chloride contained in the refuse is extracted. Almost all the substances and sulfur oxides are included in the combustion gas. Since the combustion gas is guided as it is to the heat recovery portion, corrosion has occurred in the metal portion in contact with the combustion gas.

Since ordinary fuel is composed of almost the same components, it is not possible to separate the combustion gas components generated in the combustion process, but in the case of dust, focusing on the corrosive components,
The present inventor has noted that most of the corrosive components are released into the combustion gas at the beginning of the combustion process.

In view of such problems of the prior art and the knowledge of the inventor, the main object of the present invention is to allow the combustion gas generated from the combustion zone to be separately treated before and after the conveying direction, and An object of the present invention is to provide a refuse incineration facility that can prevent corrosion and improve boiler efficiency when a high temperature and high pressure boiler is used.

[0012]

According to the present invention, such an object is to provide a combustion zone for carrying garbage and continuously burning it, and for exhausting combustion gas generated from the combustion zone. In a refuse incineration facility having a duct, the duct collects and exhausts a combustion gas generated from a front stage of the combustion zone, and a combustion gas generated from a rear stage of the combustion zone. It is achieved by providing a refuse incineration facility, characterized in that it has a second duct part for collecting and exhausting. In particular, the refuse incineration facility has a boiler device including a steam generator and a steam superheater, guides the combustion gas collected by the first duct part to the steam generator, and the second duct part. The combustion gas collected by the steam superheater is introduced to the steam superheater, or a economizer is provided downstream of the steam generator in the duct, or the first duct section is provided. A movable guide vane or a movable sloping plate capable of varying the distribution ratio of the combustion gas amount to the both ducts between the second duct part and the second duct part, or the high temperature combustion. A bypass passage is provided in the second duct portion so that gas can bypass the steam superheater, and a damper for varying the bypass flow rate is provided; or At least one of an additional dust input port, an auxiliary fuel input port, and an auxiliary fuel combustor is provided in the vicinity of the upstream portion of the latter stage of the combustion zone, or the combustion zone includes a drying section and a front combustion section. And a post-combustion unit, and each of the units may be configured to be able to independently change the transport speed of each dust in order to change the transport speed of the dust according to the degree of completion of combustion of the dust.

[0013]

[Operation] The waste supplied from the waste incinerator's waste feeder is dried, ignited / decomposed, pre-combusted, and post-combusted, and the combustion ends, but the supplied waste is heated before the combustion zone. To be dried. When heated further, the dust ignites and begins to decompose, hydrochloric acid or chlorine gas is released from salt or vinyl chloride, and corrosive gas such as sulfurous acid gas is released from dust containing sulfur compounds such as rubber. . When the temperature further rises and combustion progresses, most of the corrosive gases such as chlorine compounds and sulfur compounds are released into the combustion gas, and the combustion gas from the preceding stage is guided to the first duct section. The dust is conveyed to the subsequent stage and continues to burn, but the combustion gas from this latter stage contains almost no corrosive gas such as hydrochloric acid, and the combustion gas is guided to the second duct portion.

The combustion gas generated in the preceding stage is guided to the steam generator of the boiler device through the first duct section to generate steam. The heating pipe temperature of the steam generator is governed by the temperature of the boiler water, and depending on the heat transfer rate, it is generally 10 to 10% higher than that of the boiler water.
The temperature rises to about 30 ° C., and in a 100 atm boiler, for example, the heating tube temperature is about 320 to 340 ° C.

The combustion gas generated in the latter stage contains almost no corrosive components such as chlorine, and the combustion gas is guided to the steam superheater through the second duct section. The temperature of the steam superheater is 30 to 50 ° C higher than the steam temperature, depending on the heat transfer rate.
It gets higher. For example, the temperature of the heating pipe is the steam temperature 51.
Although it becomes about 540 to 560 ° C. at 0 ° C., since it contains almost no corrosive component, high temperature corrosion can be avoided. In addition, after the combustion gas in the latter stage is radiated by the steam superheater side, it is guided to the steam generator part, merged with the combustion gas in the former stage, and then guided to the second steam generator and the economizer to recover heat. it can. Further, a bypass for the steam superheater and a damper for opening and closing the steam superheater are provided in the second duct portion, and the damper is opened appropriately to bypass the steam superheater by the combustion gas and reduce the heat supply amount to the steam superheater. And the steam outlet temperature can be controlled. Further, by providing an additional dust input port, an auxiliary fuel input port, or an auxiliary fuel combustor in the vicinity of the upstream portion of the latter stage of the combustion zone, combustion can be favorably promoted. Also, by making the transport speed of the dust in each of the dry zone, the front burn zone, and the post burn zone in the combustion zone independent of each other, the dust in each zone can be changed according to the degree of completion of combustion of the dust. Can be changed, the combustion ratio of the front stage and the rear stage for various kinds of dust can be changed, and the ratio of the combustion gas to the first duct and the second duct can be changed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of a main part of a moving bed type refuse incineration facility to which the present invention is applied. In the garbage pit 1 provided on the left side of the drawing, the garbage dropped from the garbage truck loaded into the vehicle loading port (not shown) is collected.
On the right side of the dust pit 1 in the drawing, a dust feeder 2 is provided, and a crane machine 3 is provided so as to be reciprocally movable between the two. The waste in the waste pit 1 is appropriately supplied to the hopper 2a provided on the upper part of the waste feeder 2 by the crane machine 3 by the operation of an operator (not shown).

The waste feeder 2 is connected downward from the upper hopper 2a as shown in the figure. The dry stoker 4 is continuously installed at the lower end of the waste feeder 2, and the waste supplied from the waste feeder 2 is supplied to the dry stoker 4 from the waste feeder 2b below the waste feeder 2. The drying stoker 4 is conveyed slightly obliquely downward. A pre-combustion stoker 5 and a post-combustion stoker 6 are continuously installed in this order at the downstream end of the dry stoker 4. In addition, these stokers 4-6
Various types such as stair sliding type, running type, rotating type, stair reverse sliding type, reversing type, and parallel swing stair type can be used.

The dust that has finished burning in both combustion stokers 5 and 6 becomes ash and is conveyed to an ash recovery chamber (not shown) by an ash discharging conveyor 7 provided below the downstream end of the post-combustion stoker 6. It is like this.

A hood 8 is provided above the dry stoker 4 and both combustion stokers 5 and 6 to collect the combustion gas and the like generated from them, and a combustion chamber is defined by these. At the upper part of the hood 8, there is provided a duct 9 composed of a boiler water cooling wall forming a water can portion of the boiler. The part of the duct 9 that extends upward from the upper end of the hood 8 is formed by a partition wall 9a that is a boiler water cooling wall.
Is divided into a duct part 10 and a second duct part 11. The first duct part 10 mainly collects combustion gas generated from the pre-combustion stoker 5, and the second duct part 11 mainly. The combustion gas generated from the post-combustion stoker 6 is collected. Further, a guide vane 12 is provided at the lower end of the partition wall 9a so that the distribution ratio of the combustion gas to the respective duct portions 10 and 11 of the combustion gas can be changed.
It is pivotally attached so that it can be tilted as shown in. The guide vane 12 can be operated from outside the furnace.

The duct 9 is formed so that the combustion gas joins above the duct portions 10 and 11, and a U-shaped duct portion 13 formed in a U-shape downstream thereof.
Is provided so as to extend toward the exhaust gas treatment device (not shown) on the right side of the drawing after passing through the U-shaped duct portion 13.

The second duct portion 11 is provided with a steam superheater 15 which constitutes the boiler device 14, and a bypass passage 11a is provided beside the steam superheater 15. The bypass passage 11a is provided with a damper 16 for selectively opening and closing the bypass passage 11a. Further, since the heat of the combustion gas passing through the duct 9 and the U-shaped duct portion 13 is used, the duct 9 and the bypass passage 1
1a, damper 16, partition wall 9a, U-shaped duct portion 13, U
A water pipe is provided at each portion of the walls 9c and 13a forming the character duct portion 13. In order to further recover heat, the steam generator 17 of the boiler device 14 is provided upstream of the U-shaped duct portion 13, and the low temperature portion of the economizer 18 is provided downstream of the U-shaped duct portion 13. There is.

A steam drum 19 is installed on the upper surface of the duct 9 in the figure. Also, the U-shaped duct portion 13
The dust conveyor 20 for the boiler is provided at the lowest end of the.

In the waste incinerator thus constructed, the waste is supplied from the waste feeder 2 to the dry stoker 4, and the waste is first dried by the dry stoker 4, ignited and transferred to combustion. To do. In the process, the waste is heated,
Chlorine compounds and sulfur compounds contained in the waste are decomposed, and corrosive components such as chlorine gas, gaseous hydrochloric acid and sulfurous acid gas are released into the combustion gas. These gases are subjected to heat recovery in the first duct section 10 composed of a boiler water pipe as shown by the broken line arrow B in the figure, and are guided to the steam generator 17 via the first duct section 10, There, heat is recovered and steam is generated.

Although the combustion gas contains a corrosive component, the steam generator 17 of the boiler device 14, the duct 9, the partition wall 9a,
The temperature of each wall of the U-shaped duct portion 13 and the wall 13a is only about 10 to 30 ° C. higher than the temperature of the water.
In a 0 atm boiler, the superheater tube temperature is 320-
It will be about 340 ° C. Therefore, high temperature corrosion can be avoided.

The dust sent to the post-combustion stoker 6 has a small amount of chlorine compounds and sulfur compounds, and thereafter the combustion progresses at the combustion stoker 6 to complete the combustion. The combustion gas from the post-combustion stoker 6 contains almost no corrosive components and, as described above, the second duct portion 11
Through the steam superheater 15 as shown by arrow C in the figure.
Be led to. The pipe wall temperature of the steam superheater 15 is higher than the steam temperature by about 30 to 50 ° C., for example, when the steam temperature is 510 ° C., the pipe wall temperature is about 540 to 560 ° C., but it contains almost no corrosive component. High temperature corrosion can be avoided.

By the way, when the damper 16 provided adjacent to the steam superheater 15 is opened, the combustion gas guided to the second duct portion 11 bypasses the steam superheater 15, so that the steam superheater 15 is supplied to the steam superheater 15. Heat supply decreases. Damper 1 like this
By appropriately opening and closing 6, the steam outlet temperature of the boiler device 14 can be controlled. In addition, the steam superheater 15
Generally, a water spray desuperheater is used to control the outlet temperature of the product, and by using it in combination, a broader control function can be provided. The amount of heat from the latter stage is governed by the degree of completion of combustion in the former stage, so the temperature control mechanism of the steam superheater 15 has an important meaning.

By operating the guide vanes 12 provided between the first duct portion 10 and the second duct portion 11 so as to tilt appropriately, a part of the combustion gas from the post-combustion stoker 6 is removed. It can be mixed with the combustion gas from the pre-combustion stoker 5, and the amount of heat introduced to the second duct portion 11 can be reduced. Although the guide vane 12 is used in the present embodiment, a damper may be provided in either or both of the duct portions 10 and 11 to change the opening / closing amount of the damper as appropriate. The same effect as described above can be obtained.

Further, the steam superheater 1 of the second duct portion 11
5 By providing a thermometer and a flow meter at the inlet to the installation portion, detecting the temperature and flow rate of the combustion gas, and calculating the inflow heat of the combustion gas into the steam superheater 15 from these detected values,
It is advisable to predict the steam outlet temperature of the steam superheater 15 and perform tilting control of the guide vanes 12 accordingly to keep the temperature of the steam superheater 15 stable.

The heat of the combustion gas guided to the second duct portion 11 is recovered by the steam superheater 15, and then the steam generator 1
Heat is also recovered when passing through 7. Further, the economizer 18 is provided downstream, and the inlet temperature of the water can be easily controlled to be maintained at 150 ° C or higher.

Then, the combustion gas thus heat-recovered is discharged from the chimney after being subjected to pollution measures by means of a dust / smoke treatment device or the like. Although superheated steam is used as the steam used to turn the turbine of the generator, the heat quantity for superheating is 10 to 10 times the heat quantity for steam generation.
It is about 20%, and the heat quantity of the combustion gas mainly from the post-combustion stoker 6 in this embodiment is sufficient.

Further, the combustion zone is divided into a dry stoker 4 as a drying section, a pre-combustion stoker 5 as a front combustion section, and a post-combustion stoker 6 as a post-combustion section. These stokers 4 to 6 are used. The transport speed of each dust can be made variable independently of each other. Therefore, it is possible to change the conveying speed of each of the wastes according to the degree of completion of the combustion of the wastes in each of the stokers 4 to 6. For example, the combustion is completed in the pre-combustion stoker 5, and the post-combustion stoker 6 is completed. If the quality of the waste is such that the combustion gas from the
By increasing the waste conveying speed of the pre-combustion stoker 5, it is possible to secure a sufficient amount of heat generated in the post-combustion stoker 6, and it is possible to avoid a shortage of combustion gas in the post-combustion stoker 6.

Next, a modified embodiment of FIG. 1 is shown in FIG. 2, and the same parts as those of the above embodiment are designated by the same reference numerals and detailed description thereof will be omitted. In the above embodiment, the boiler device 1
The first duct portion 10 and the second duct portion 11 were adjacently separated from each other by the partition wall 9a composed of the water cooling wall 4 of FIG. 4, but in the second embodiment, both duct portions 10 and 11 are separated. ,
The walls 9b provided between the two are spaced apart from each other to some extent. A pre-combustion gas damper 21 is provided at an intermediate portion of the first duct portion 10. In this embodiment, the steam generator 17 of the above embodiment is formed by the duct portions 10 and 11 formed by the hood 8 and the duct 9.
Corresponds to the first steam generator. A second steam generator 17a configured by each water cooling wall of the boiler device 14 is provided after the merging of the both duct portions 10 and 11, and a U-shaped duct portion 13 is formed in the downstream side portion thereof. The third steam generator 17b and the economizer 18 are arranged in this order in the downstream portion of the U-shaped duct portion 13.

The guide vanes 12 are provided in the same manner as described above, and by operating the guide vanes 12 and the front combustion gas damper 21 in combination, the first duct portion 10 is operated.
The amount of combustion gas passing through can be controlled. The steam generated by the steam generators 17a and 17b is sent to the steam superheater 15 via the steam drum 19, and the steam superheater 15 extracts the superheated steam.

Further, FIG. 3 shows a refuse incineration facility having a structure in which a rotary kiln type rotary combustion furnace 22 and a combustion stoker 23 composed of a moving bed type combustion furnace similar to the above-mentioned embodiments are combined. ing. In the third embodiment, the waste collected at the waste collection point is the waste conveyor 24.
It is designed to be thrown into the waste hopper provided at the upstream end of the rotary combustion furnace 22 through the rotary combustion furnace 22 instead of the drying stoker 4 of the above-mentioned embodiment. 23. The other structures are the same as those in the second embodiment, and the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

In the third embodiment, the dust introduced into the rotary combustion furnace 22 as described above is converted into the rotary combustion furnace 22.
It becomes dry, ignites, and pre-burns at. By controlling the residence time in the rotary combustion furnace 22, 60 to 8
It is possible to perform 0% combustion. In this process, the corrosive components are discharged into the combustion gas from the dust containing chlorine and sulfur. This combustion gas is guided to the steam generator 17 through the first duct portion 10 and used as a heat source for generating steam. The tube wall temperature of the steam generator 17 here is only about 10 to 30 ° C. higher than the temperature of water, and high temperature corrosion can be avoided.

The waste sent out from the rotary combustion furnace 22 is completely combusted by the combustion stoker 23.
The combustion gas from the combustion stoker 23 is guided to the steam superheater 15 via the second duct portion 11 while containing almost no corrosive gas. The pipe wall temperature of the steam superheater 15 is higher than the steam temperature by about 30 to 50 ° C., but since the combustion gas here contains almost no corrosive gas,
There is no concern about high temperature corrosion.

A damper 26 is provided downstream of the steam superheater 15, that is, above the steam superheater 15 as shown by an imaginary line, and burns before being guided to the second duct portion 11 side. By combining a part of the gas with the combustion gas from the rotary combustion furnace 22, the amount of heat to the steam superheater 15 can be controlled. Further, by providing the damper 12 above the combustion stoker 23, the introduction amount of the combustion gas to the second duct is changed to change the steam superheater 1
The amount of heat to 5 can be controlled. The combustion gas that has passed through the steam superheater 15 is again heat-recovered by the steam generators 17a and 17b or the economizer 18, and is discharged from the chimney.

In the third embodiment, when the refuse is transferred from the rotary combustion furnace 22 to the combustion stoker 23, which is the upstream stage of the combustion zone, in order to add a new incineration product containing no chlorine compound. The additional waste introduction port 25 can be provided as shown by the imaginary line in FIG. 3, and the installation can be easily performed. It should be noted that an auxiliary fuel input port or an auxiliary fuel combustor may be provided instead of the additional dust input port 25 to promote combustion and improve complete combustion.

In the refuse incineration facility according to the present invention, it is possible to combine combustion furnaces of different types as shown in the third embodiment, and by doing so, The incineration characteristics can be used to further clarify the separation of the components of the combustion gas. Examples of such various combinations include a moving bed combustion furnace and a fluidized bed combustion furnace combined, a rotary combustion furnace and a fluidized bed combustion furnace combined, and a rotary combustion furnace fixed A combination of a rotary combustion furnace and a moving combustion furnace, and a combination of a moving bed combustion furnace and a rotary combustion furnace are effective.

Further, FIG. 4 shows a fourth embodiment. The fourth embodiment has the same structure as the second embodiment, and the same parts as those in FIG. 2 are designated by the same reference numerals and the detailed description thereof will be omitted. In this embodiment, as shown in FIG. 4, instead of the guide vanes 12 of the second embodiment,
A movable tilting plate 27 is provided. This inclined plate 27
Is indicated by an arrow D in the figure so that the intermediate portion is pivotally supported at the lower part of the wall 9b provided between the both duct parts 10 and 11, and the ratio of the combustion gas flowing to each duct part 10 and 11 can be changed. As described above, it is tiltable by an external operation.
Therefore, the amount of heat introduced to the second duct portion 11 can be adjusted, and the temperature of the steam superheater 15 can be controlled to be maintained stably.

[0042]

As described above, according to the present invention, the combustion gas is divided into two or more parts, and the combustion gas extraction part from each of them is provided. It can be easily separated from the combustion gas that is not present. By separating in this way, the limestone for desulfurization and denitration can be changed according to the content (ratio) of harmful substances in the gas by dividing the limestone into the former stage and the latter stage, The input amount can be reduced, the detoxification rate can be increased, and the processing cost can be reduced. In particular, when a boiler device is used, it is possible to prevent the corrosive component from being contained in the combustion gas that is introduced into the steam superheater, which has the highest temperature, and thus it is possible to avoid corrosion at high temperatures. Therefore, the pressure and temperature of steam in the boiler device can be significantly increased, and high quality heat can be taken out. The efficiency of the power generation equipment utilizing this steam heat can be remarkably increased as compared with the conventional one, and according to the present invention, the power generation efficiency can be increased to approximately 30% or more. In addition, the temperature of the water supplied to the economizer can be lowered, and the thermal efficiency of the boiler can be improved. Further, since it is possible to avoid corrosion even if the amount of combustion air is reduced, it is an excellent combustion device in terms of environment such as reduction of nitrogen oxides due to low oxygen combustion and reduction of dioxin due to increase in combustion temperature. In addition, the reduction of combustion air will result in less heat loss from the chimney, further enhancing heat utilization,
This not only improves the thermal efficiency of the boiler, but also reduces the equipment capacity of the exhaust gas treatment facility, which has the effect of reducing the construction cost of the entire refuse incineration facility.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a main part of a moving-bed-type refuse incineration facility to which the present invention is applied.

FIG. 2 is a view similar to FIG. 1 showing a second embodiment of the refuse incineration facility.

FIG. 3 is a view similar to FIG. 1 showing a third embodiment of the refuse incineration facility.

FIG. 4 is a view similar to FIG. 2 showing a fourth embodiment of the refuse incineration facility.

[Explanation of symbols]

 1 Garbage Pit 2 Garbage Feeder 2a Hopper 2b Garbage Feeder 3 Crane Machine 4 Drying Stoker 5 Pre-burning Stoker 6 Post-burning Stoker 7 Ash Burning Conveyor 8 Hood 9 Duct 9a Partition Wall 9b Wall 9c Wall 10 First Duct 11 2nd duct part 11a Bypass path 12 Guide vane 13 U-shaped duct part 14 Boiler apparatus 15 Steam superheater 16 Damper 17 Steam generator 17a Second steam generator 17b Third steam generator 18 Cobber 19 Steam drum 20 Boiler dust conveyor 21 Pre-combustion gas damper 22 Rotary combustion furnace 23 Combustion stoker 24 Conveyor 25 Additional waste input port 26 Damper 27 Sloping plate

Claims (7)

[Claims] 1. A refuse incineration facility having a combustion zone for carrying waste and burning it continuously, and a duct for exhausting combustion gas generated from the combustion zone, the duct comprising: A first duct portion for collecting and exhausting combustion gas generated from a front stage of the combustion zone, and a second duct portion for collecting and exhausting combustion gas generated from a rear stage of the combustion zone. Characteristic waste incineration facility. 2. The refuse incineration facility has a boiler device including a steam generator and a steam superheater, and guides the combustion gas collected by the first duct section to the steam generator, The incineration facility according to claim 1, characterized in that the combustion gas collected by the duct part of (1) is guided to the steam superheater. 3. The refuse incinerator according to claim 1, wherein a economizer is provided downstream of the steam generator in the duct. 4. A movable guide vane or a movable sloping plate is provided between the first duct portion and the second duct portion to make the distribution ratio of the combustion gas amount to the both duct portions variable. The waste incineration facility according to any one of claims 1 to 3, which is provided. 5. A bypass passage is provided in the second duct portion so that the high-temperature combustion gas can bypass the steam superheater, and a damper for varying the bypass flow rate is provided. The waste incineration facility according to any one of claims 1 to 4, which is characterized by being. 6. The at least one of an additional dust input port, an auxiliary fuel input port, and an auxiliary fuel combustor is provided in the vicinity of the upstream portion of the latter stage of the combustion zone. The refuse incineration facility according to claim 5. 7. The combustion zone has a drying section, a front combustion section, and a post combustion section, and each of the sections conveys the refuse at a different speed according to the degree of completion of combustion of the refuse. The waste incineration facility according to any one of claims 1 to 6, characterized in that the above can be made variable independently of each other.