JP2003161410A - Combustibles supply method of incinerator and its device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustibles supply method of an incinerator, and its device which reduces exhaust of NOx (nitrogen oxides), CO (carbon monoxide), and dioxin with the same reburning effect as reduction of an exhaust quantity of NOx and CO by furnace multistage combustion, without increasing an operation cost caused by supplying new fuel in a furnace. <P>SOLUTION: This combustibles supply method of the incinerator supplies combustibles to the incinerator for performing primary combustion including gasification by supplying primary air in a combustibles layer supplied to a combustion furnace such as a stoker, and performing secondary combustion by supplying secondary air to a secondary combustion chamber at an elevated position of the combustion furnace, and is characterized by introducing and burning gasified gas generated by a pyrolizing gasification part to and in the secondary combustion chamber by supplying the combustibles in parallel to a first supply passage for supplying the combustibles to the combustion furnace via the pyrolyzing gasification part for pyrolyzing and gasifying the combustibles and a second supply passage for directly supplying the combustibles to the combustion furnace. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a stoker type incinerator, etc., and performs primary combustion including gasification by supplying primary air into a combustible material layer supplied to a combustion furnace such as a stoker, The present invention relates to a combustible material supply method and apparatus for supplying combustible material to an incinerator configured to supply secondary air to a secondary combustion chamber above a combustion furnace to perform secondary combustion.

[0002]

2. Description of the Related Art In a stoker-type incinerator 100 shown in FIG. 5, primary air is supplied into a combustible material layer put on a stoker 101 through a primary air pipe 111 and a wind box 130 so that the stoker 101 can be heated. The primary combustion chamber 102 performs primary combustion including pyrolysis gasification, and then the primary combustion chamber 102
In the secondary combustion chamber 105 provided above the secondary combustion chamber 105, secondary air is supplied by the secondary air pipe 106 to perform high temperature combustion (secondary combustion) to suppress emission of soot dust and dioxin in the exhaust gas. In such a stoker type incinerator 100,
NOx (nitrogen oxide) and C exhausted with exhaust gas
To reduce the amount of O (carbon monoxide) emission, fuel such as city gas is blown into the furnace to create a reduction region to reduce NOx, and complete combustion is achieved by multistage combustion by blowing fuel to generate CO. There has been proposed a reburning means (multi-stage combustion means) for suppressing the above.

Further, in Japanese Patent Laid-Open No. 11-294742, it is possible to supply natural gas and steam to the secondary combustion chamber side, and a control device controls the timing of blowing the natural gas and steam into the furnace to produce exhaust gas. It reduces the emission of NOx and CO (carbon monoxide).

[0004]

However, conventional reburning means such as a means for injecting a fuel such as city gas into a secondary combustion chamber in a furnace for multi-stage combustion and a means proposed in JP-A-11-294742. NOx
In order to reduce the emission of (nitrogen oxides) and CO (carbon monoxide), it is necessary to continuously supply new fuel into the incinerator during its operation, so the operating cost associated with fuel consumption Becomes higher. In particular, when the amount of combustibles (waste) to be treated increases, the amount of supply of the new fuel also increases as the amount of treatment increases, leading to a further increase in operating costs. I have a problem.

In view of the above problems of the prior art, the present invention uses NOx (nitrogen oxide) and CO (carbon monoxide) by multi-stage combustion in the furnace without incurring an increase in operating cost associated with the supply of new fuel into the furnace. (2) The same as the reburning effect of reducing the emission amount of (1), it is an object of the present invention to provide a combustible material supply method and device for an incinerator that can reduce the emission of NOx, CO and dioxin.

[0006]

In order to solve the above problems, the present invention provides, as an invention according to claim 1, gasification by supplying primary air into a combustible material layer supplied to a combustion furnace such as a stoker. In the combustible material supply method of the incinerator, which performs the primary combustion including, supplies the combustible material to the incinerator configured to perform the secondary combustion by supplying the secondary air to the secondary combustion chamber above the combustion furnace,
A first supply path for supplying the combustible material to the combustion furnace via a pyrolysis gasification section for pyrolyzing and gasifying the combustible material and a second supply path for directly supplying the combustion furnace. We propose a method for supplying combustibles in an incinerator, which is characterized in that they are supplied in parallel.

In the first aspect of the present invention, preferably, as described in the second aspect, the gasification gas generated in the pyrolysis gasification section is introduced into the secondary combustion chamber for combustion.

A seventh aspect of the present invention is an invention of an apparatus for carrying out the first and second aspects of the invention, wherein the first combustible material supply unit directly supplies a primary layer in a combustible material layer directly supplied to a combustion furnace such as a stoker. In the combustible material supply device of the incinerator, which is configured to supply the air to perform the primary combustion and to supply the secondary air to the secondary combustion chamber provided above the combustion furnace to perform the secondary combustion, Pyrolysis gasification means for performing pyrolysis gasification of a substance is attached to the incinerator, and a second combustible material supply part for supplying a combustible material to the pyrolysis gasification means is the first combustible material supply part. Is provided separately, and the pyrolysis gasification means and the secondary combustion chamber are connected to introduce all or part of the pyrolysis gas generated by the pyrolysis gasification means into the secondary combustion chamber. A gasification gas passage is provided, and the pyrolysis gasification means is tilted with respect to the incinerator. And wherein the tilt angle was adjustable.

[0009] In claim 7, specifically, as in claim 8, the pyrolysis gasification means comprises a combustible material flowing in a cylindrical combustible material supply duct, and an outer periphery of the combustible material supply duct. It is composed of a kiln that heats and gasifies the combustible material by heat exchange with the heating fluid flowing through the heating fluid passage formed between the combustible material and the inner circumference of the case.

According to the present invention, the second combustible material is concurrently supplied with the combustible material directly supplied from the combustible material supply section to the combustion furnace such as a stoker to perform the primary combustion by the primary air including gasification. A combustible material is supplied from a supply unit to the pyrolysis gasification means comprising the kiln according to claim 8, and the pyrolysis gasification means performs the pyrolysis gasification of the combustible material, and the generated gasification gas is secondary. Since it is introduced into the combustion chamber and burned, the pyrolysis gas from the pyrolysis gasification means can be burned in the reducing atmosphere in the secondary combustion chamber, the generation of NOx is suppressed, and the gasification gas and the Complete combustion with secondary air is possible and CO and dioxin emissions are suppressed. Further, the unburned char in the pyrolysis gasification means can be completely burned in a combustion furnace such as a stoker.

Therefore, it is not necessary to supply the new fuel into the furnace as in the prior art, and the operating cost is not increased.
Emissions of Ox, CO and dioxins can be reduced.

In addition, the combustibles are directly supplied from a first combustibles supply section to a combustion furnace such as a stoker, and are supplied from the second combustibles supply section to a pyrolysis gasification means for gasification. Since the combustibles are simultaneously supplied to the combustion system including gasification,
It is possible to increase the throughput of combustibles and increase the throughput of the incinerator without increasing the size of the incinerator and eliminating the need to supply new fuel as described above. Further, since the ash from the pyrolysis gasification means can be supplied to a combustion furnace such as a stoker and treated together with the ash in the combustion furnace, the ash treatment system becomes one and the structure of the incinerator becomes compact.

Further, it becomes possible to supply the industrial waste having a high calorific value to the pyrolysis gasification means to gasify it, and to supply the waste having a low calorific value such as sludge to a combustion furnace such as a stoker for combustion. Therefore, it is possible to suppress the generation of black smoke by gasifying the industrial waste of high calorific value, which easily generates black smoke in normal combustion, by the pyrolysis gasification means and then burning it in the secondary combustion chamber. it can. Further, since the unburned char from the pyrolysis gasification means serves as auxiliary fuel in the combustion furnace such as a stoker, it is possible to reduce the supply amount of auxiliary combustion at the time of burning sludge or the like. Further, as in claim 7, by adjusting the inclination angle of the pyrolysis gasification means, the pyrolysis time can be adjusted depending on the combustible material to be treated.

According to a third aspect of the present invention, in the first aspect,
The heating air heated by the gas during or after the secondary combustion is introduced into the thermal decomposition gasification section, and the combustible material supplied to the thermal decomposition gasification section is thermally decomposed and gasified by the heating air. It is characterized by

The invention according to claim 9 is the invention of an apparatus for carrying out the invention according to claim 3, and in claim 7, the heat of the gas in the furnace is provided at the secondary combustion chamber or at the outlet of the secondary combustion chamber. An air preheater for heating air by means of which the air outlet of the air preheater is connected to the pyrolysis gasification means, and the heated air from the air preheater is supplied to the pyrolysis gasification means It is characterized by being done.

According to the inventions of claims 3 and 9, since the air for preheating is used to heat the gas for gasification to the pyrolysis gasification means by the heat of the exhaust gas containing the combustion gas in the furnace in the air preheater, Exhaust gas heat can be recovered for chemical use, and the thermal efficiency of the device is improved.

According to a fourth aspect of the present invention, in the first aspect,
The recirculated gas (EGR gas) from the dust removal device after the secondary combustion is guided to the pyrolysis gasification section, and the combustible material supplied to the pyrolysis gasification section is pyrolyzed and gasified by the recirculation gas. It is characterized by

A tenth aspect of the present invention is an invention of an apparatus for carrying out the invention of the fourth aspect, and in the seventh aspect, the recirculation gas (EGR gas) outlet from the dust removing device after the secondary combustion and the heat It is characterized in that a recirculation gas pipe line connecting with the cracking gasification means is provided, and the recirculation gas is supplied to the thermal decomposition gasification means through the recirculation gas pipe line.

According to the invention of claims 4 and 10, the recirculation gas (EGR gas) from the dust removing device is supplied to the pyrolysis gasification means and used for the pyrolysis gasification of the combustible material.
High-calorie pyrolysis gas is obtained, which enables high-temperature combustion in a reducing atmosphere in the secondary combustion chamber, promotes mixing in the furnace, eliminates local low or high temperature regions, and releases NOx and dioxins. The amount can be reduced.

According to the invention of claim 5, in claim 1,
It is characterized in that steam is supplied to the pyrolysis gasification section and the steam is used for pyrolysis gasification of the combustible material. According to such an invention, by supplying steam to the pyrolysis gasification section, the pyrolysis gasification of combustibles is promoted by the steam, and a gasification gas having a high calorific value containing a large amount of hydrogen is obtained, High temperature combustion in the secondary combustion chamber using such gasified gas is possible.

According to the invention of claim 6, in claim 1,
It is characterized in that oxygen or oxygen-enriched air is supplied to the pyrolysis gasification section and the oxygen or oxygen-enriched air is used for pyrolysis gasification of the combustible material. According to this invention, by using oxygen or oxygen-enriched air for the pyrolysis gasification of the combustible material, gasification is promoted and a gasified gas with a high calorific value is obtained.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention thereto, unless there is a specific description, and are merely illustrative examples. Nothing more.

FIG. 1 is an overall configuration diagram of a stoker type incinerator and its combustible material supply apparatus according to a first embodiment of the present invention.
2 is a Z arrow view of FIG. 1, and FIG. 3 is a cross-sectional view of the main part of the kiln. FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

In FIG. 1 showing the first embodiment of the present invention,
A stoker furnace 100 is configured as follows. 10
Reference numeral 1 is a stoker (grate) that constitutes a combustion furnace, 108 is a main waste hopper that stores dust (combustible material) that is thrown onto the stoker 101, 102 is a primary combustion chamber formed above the stoker 101, Reference numeral 105 is a secondary combustion chamber provided above the primary combustion chamber 102. Reference numeral 103 is an exhaust gas pipe for discharging exhaust gas from the secondary combustion chamber 105, 113 is a dust removing device for removing soot and the like in the exhaust gas, and 114 is exhaust gas heat after secondary combustion in the secondary combustion chamber 105. It is a boiler for. Reference numeral 104 connects the recirculation gas (EGR gas) outlet of the dust removing device 113 and the secondary combustion chamber 105, and the recirculation gas from the dust removing device 113 is connected to the secondary combustion chamber 1
It is an EGR pipe (recirculation gas pipe) for supplying to 05.

Numeral 130 is a wind box provided in each of the stoker 101, which is provided from a drying stage in a front stage to a main combustion stage to a lower stage in a subsequent combustion stage. 111 is the wind box 130
A primary air flow rate adjusting valve (not shown) is used to open and close the conduit in the primary air pipe for supplying primary air to each of the above. 1
Reference numeral 06 denotes a secondary air pipe for supplying secondary air into the secondary combustion chamber 105, and the pipeline is opened and closed by a secondary air flow rate adjusting valve (not shown). The above structure is the same as that of the conventional stoker incinerator and combustibles supply system. In the present invention, a method and a device for supplying combustibles to an incinerator including a stoker type incinerator are improved.

That is, in FIG. 1, 1 is a kiln constituting a pyrolysis gasification means integrally fixed to a diagonal upper portion of the stoker furnace 100 by a bolt or the like, and 2 is a diagonal diagonal upper portion of the kiln 1 by a bolt or the like. It is a kiln-side waste hopper that is integrally fixed. Main garbage hopper 108 and kiln 1
In FIG. 2 showing the plane arrangement with the waste hopper 2 on the kiln side, 109 is a main waste supply port which is a waste outlet of the main waste hopper 108, and 7 is a kiln which is an outlet for gasification gas and char of the kiln 1. At the side gas and char outlets, the main waste hopper 108 and the kiln 1 and the kiln side waste hopper 2 are arranged with an inclination angle in the vertical direction with respect to the stoker 101, and the main waste supply port 109 and the kiln side gas are provided. The char outlet 7 opens at the front part (drying stage) of the stoker 101 so that the waste from the main waste hopper 108 and the char from the kiln 1 can be simultaneously supplied to the front part (drying stage) of the stoker 101. There is. The tilt angle of the kiln 1 can be adjusted, and the pyrolysis time can be adjusted depending on the combustible material to be treated. Returning to FIG. 1, 3 is a gasification gas passage that connects the kiln side gas, the char outlet 7 and the secondary combustion chamber 105. The gasification gas generated in the kiln 1 is supplied to the gasification gas passage 3 It is adapted to be supplied into the secondary combustion chamber 105 via the.

Reference numeral 4 denotes the secondary combustion chamber 105 or an air preheater provided at the outlet of the secondary combustion chamber 105, which is a gas in the furnace or exhaust gas flowing in the secondary combustion chamber 105 or its outlet and air. Is heat-exchanged with each other to heat the air by the heat of the gas or exhaust gas in the furnace. The air heated by the air preheater 4 is passed through the air pipe 8 to the kiln 1
Is supplied to the heated fluid inlet 14 (see FIG. 3). Reference numeral 5 denotes a blower, the suction port of which is connected to the heating fluid outlet 15 (see FIG. 3) of the kiln 1 through an air pipe 9 and the discharge port of which is connected to the inlet of the air preheater 4 through an air pipe 10. Then, the air after being used for gasification of the waste in the kiln 1 is sent to the air preheater 4.

In FIG. 3 showing the details of the kiln 1,
Reference numeral 11 is a cylindrical case, 12 is a dust supply duct penetratingly provided inside the case 11, and an annular heating fluid passage 1 is provided between the outer circumference of the dust supply duct 12 and the inner circumference of the case 11.
3 is formed. An inlet side of the dust supply duct 12 is communicated with the kiln side dust hopper 2, and an outlet side thereof is communicated with the stoker 101 through the kiln side char supply port 7. The heating fluid passage 13 is closed by covers 17 provided on both sides thereof. A heating fluid inlet 14 is an inlet for heating air to the heating fluid passage 13 and is connected to the air pipe 8. A heating fluid outlet 15 is an outlet of heating air to the heating fluid passage 13,
It is connected to the air pipe 9.

Returning to FIG. 1, 6 is a steam supply pipe connected to the inlet of the dust supply duct 12 of the kiln 1 for supplying steam to the waste supply duct 12, and the steam from the steam supply pipe 6 Is used for the pyrolysis gasification of waste flowing in the waste supply duct 12. 1
Reference numeral 6 denotes an oxygen / air supply pipe which is connected to an inlet portion of the waste supply duct 12 of the kiln 1 and supplies oxygen or oxygen-enriched air to the waste supply duct 12, the oxygen and oxygen from the air supply pipe 16. Alternatively, oxygen-enriched air is used for the pyrolysis gasification of the waste flowing in the waste supply duct 12.

In the stoker type incinerator and the refuse supply device therefor having the above-mentioned structure, the refuse thrown into the stoker 101 from the main refuse supply port 109 of the main refuse hopper 108 passes through the primary air pipe 111 and the wind box 130. The primary air supplied to the stoker 101 is burned at a high temperature in the primary combustion chamber 102. This combustion gas is further burned at a higher temperature in the secondary combustion chamber 105 by the secondary air supplied through the secondary air pipe 106 to be completely burned and the dioxins are decomposed. The exhaust gas after combustion in the secondary combustion chamber 105 is heated by exchanging heat with the air fed from the blower 5 via the air pipe 10 in the air preheater 4, and then the exhaust gas pipe. Heat is recovered by generating steam in the boiler 114 through 103. Further, the exhaust gas is a dust remover 1
After being introduced into the dust collector 13, the dust removing device 113 removes soot and dust, and then is discharged into the atmosphere through a flue (not shown).

On the other hand, the dust supplied from the kiln-side dust hopper 2 to the kiln 1 flows in the dust feed duct 12 of the kiln 1, and flows from the air preheater 4 to the heating fluid passage via the air pipe 8. It is heated and gasified by the heated air introduced into the heating fluid passage 13 and flowing in the heating fluid passage 13.
The gasification gas is supplied to the secondary combustion chamber 105 through the gasification gas passage 3, and is burned at high temperature by the secondary air together with the gas from the primary combustion chamber 102 in the secondary combustion chamber 105. The unburned char in the kiln 1 is the gas from the kiln side, and the stoker 101 from the char outlet 7.
Of the stoker 101 after being supplied to the front part (drying stage) of
At the same time, it is combusted together with the waste introduced from the main waste hopper 108.

Further, the dust supply duct 12 of the kiln 1
Steam is supplied from the steam supply pipe 6 to the inlet part of
In the waste supply duct 12, pyrolysis gasification of the waste is promoted by the steam, and a high calorific gasification gas containing a large amount of hydrogen is obtained, and in the secondary combustion chamber 105 using the gasification gas. It enables high temperature combustion.

Further, the dust supply duct 1 of the kiln 1
Oxygen or oxygen- or oxygen-enriched air is supplied to the inlet portion of 2 from the air supply pipe 16, and the oxygen or oxygen-enriched air accelerates the pyrolysis gasification of the waste in the waste supply duct 12, A calorific value of gasification gas is obtained.

Therefore, according to this embodiment, the waste is supplied from the main hopper 108 to the stoker 101 to perform the primary combustion by the primary air, and the waste is supplied from the kiln side waste hopper 2 to the kiln 1. Then, the pyrolysis gasification of the waste is carried out in the kiln 1, and the produced gasification gas is introduced into the secondary combustion chamber 105 through the gasification gas pipe 3 and burned by the secondary air. The gas can be burned in the reducing atmosphere in the secondary combustion chamber 105 to suppress the generation of NOx, and the complete combustion by the gasified gas and the secondary air is enabled to suppress the emission of CO and dioxin. It Therefore,
It is possible to reduce the emission amount of NOx, CO, and dioxin due to the reburning effect similar to that in the conventional technique by eliminating the need to supply the new fuel into the stoker furnace 100 as in the conventional technique.

Further, since the waste is supplied from the main waste hopper 108 to the stoker 101, and the waste is supplied from the kiln side waste hopper 2 to the kiln 1 for gasification, the waste is simultaneously supplied to two combustion systems. It is possible to increase the treatment amount of the stoker incinerator 100 and increase the treatment capacity of the stoker incinerator 100 without increasing the size thereof. Further, since the ash containing char from the kiln 1 side can be supplied to the stoker 101 and treated together with the ash of the stoker 101, the ash 107 treatment system becomes one and the incinerator 10 is treated.
The structure of 0 becomes compact.

Further, since it becomes possible to supply the industrial waste having a high calorific value to the kiln 1 to gasify it and to supply the waste having a low calorific value such as sludge to the stoker 101 to burn it.
It is possible to suppress the generation of black smoke by gasifying the industrial waste having a high calorific value that easily generates black smoke in normal combustion in the kiln 1 and then burning it in the secondary combustion chamber 105. In addition, unburned char from kiln 1 is stoker 101
Since it serves as an auxiliary fuel for the combustion, it is possible to reduce the supply amount of auxiliary combustion when burning sludge or the like.

In the second embodiment shown in FIG. 4, the kiln 1 such as the air preheater 4 and the blower 5 in the first embodiment is used.
Instead of the means for feeding heated air for gasification of the waste into the heating fluid passage 13 of the recycle gas (EGR gas) from the dust removing device 113 through the EGR pipe 20, the kiln 1
2 is introduced into the heating fluid passage 13 (see FIG. 2) and the waste gas flowing in the waste supply duct 12 is pyrolyzed and gasified by the recirculation gas. According to the second embodiment, by supplying the recirculation gas (EGR gas) from the dust removing device 113 to the kiln 1 and using it for pyrolysis gasification of waste, a pyrolysis gas with high calorie can be obtained. In the combustion chamber 105, high temperature combustion in a reducing atmosphere becomes possible, mixing in the furnace is promoted, a local low temperature region or high temperature region is eliminated, and NOx and dioxin emissions can be reduced.

[0038]

As described above, according to the present invention, in parallel with performing the primary combustion including gasification by directly supplying the combustible material from the first combustible material supply section to the combustion furnace such as the stoker. And supplying a combustible material from the second combustible material supply unit to the pyrolytic gasification means comprising a kiln according to claim 8 and combusting the pyrolysis gas generated in the pyrolysis gasification means in the secondary combustion chamber. Therefore, the pyrolysis gas can be burned in the reducing atmosphere in the secondary combustion chamber to suppress the generation of NOx, and complete combustion by the pyrolysis gas and the secondary air can be performed, thereby reducing CO and dioxin. Emissions are suppressed. Further, the unburned char in the pyrolysis gasification means can be completely combusted in a combustion furnace such as a stoker. Therefore, it is not necessary to supply the new fuel into the furnace as in the prior art, and the emission amount of NOx, CO and dioxin can be reduced by the reburning effect similar to that in the prior art without increasing the operating cost. Can be realized.

Further, the combustibles are directly supplied from the first combustibles supply section to a combustion furnace such as a stoker, and are supplied from the second combustibles supply section to the pyrolysis gasification means for gasification. Since the combustibles are supplied to the combustion system at the same time, it is possible to increase the throughput of the combustibles, and without increasing the size of the incinerator and without the need to supply new fuel as described above, the processing capacity of the incinerator is increased. Can be increased. Further, since the ash from the pyrolysis gasification means can be supplied to a combustion furnace such as a stoker and treated together with the ash in the combustion furnace, the ash treatment system becomes one and the structure of the incinerator becomes compact.

Further, it becomes possible to supply industrial waste having a high calorific value to the pyrolysis gasification means to gasify it, and to supply refuse having a low calorific value such as sludge to a combustion furnace such as a stoker for combustion. Therefore, it is possible to suppress the generation of black smoke by gasifying the industrial waste of high calorific value, which easily generates black smoke in normal combustion, by the pyrolysis gasification means and then burning it in the secondary combustion chamber. it can. Furthermore, since unburned char from the pyrolysis gasification means becomes auxiliary fuel in the combustion furnace such as a stoker,
It is possible to reduce the amount of auxiliary combustion supplied when burning sludge or the like.

According to the present invention, the air for preheating is used to heat the gas for gasification to the pyrolysis gasification means by the heat of the exhaust gas containing the combustion gas in the furnace in the air preheater. Exhaust gas heat can be recovered for gasification of a substance, and the thermal efficiency of the device is improved.

According to the present invention, the recirculation gas (EGR gas) from the dust remover is supplied to the pyrolysis gasification means and used for the pyrolysis gasification of the combustible material. High-calorie pyrolysis gas is obtained, which enables high-temperature combustion in a reducing atmosphere in the secondary combustion chamber, promotes mixing in the furnace, eliminates local low or high temperature regions, and releases NOx and dioxins. The amount can be reduced.

According to the fifth aspect of the invention, by supplying steam to the pyrolysis gasification section, the steam promotes the pyrolysis gasification of the combustible material, and a high calorific value containing a large amount of hydrogen. A gasified gas is obtained, and high temperature combustion in the secondary combustion chamber using the gasified gas is possible.

According to the sixth aspect of the invention, by using oxygen or oxygen-enriched air for the pyrolysis gasification of the combustible material, the gasification is promoted and a gasified gas having a high calorific value is obtained. .

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a stoker type incinerator and its combustible material supply device according to a first embodiment of the present invention.

FIG. 2 is a Z arrow view of FIG.

FIG. 3 is a sectional view of a main part of the kiln.

FIG. 4 is a diagram showing a second embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 1 showing a conventional technique.

[Explanation of symbols]

1 kiln 2 Kiln side garbage hopper 3 gasification gas passage 4 Air preheater 5 Blower 6 Water vapor supply pipe 7 Kiln side gas, char exit 8, 9, 10 air tube 11 cases 12 Garbage supply duct 13 Heating fluid passage 20 EGR tube 16 Oxygen, air supply pipe 100 stoker furnace 101 Stalker (Grate) 102 Primary combustion chamber 105 Secondary combustion chamber 106 Secondary air pipe 108 Main garbage hopper 111 Primary air tube 114 boiler 130 wind box

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F23G 5/44 F23G 5/44 B 5/46 5/46 A F23L 7/00 F23L 7/00 BC ( 72) Inventor Yoshihito Shimizu 1-8-1 Sachiura, Kanazawa-ku, Yokohama City Mitsubishi Heavy Industries, Ltd. Yokohama Research Laboratory (72) Inoue Masayuki 1-8-1 Sachiura, Kanazawa-ku, Yokohama City Mitsubishi Heavy Industries Ltd. Yokohama Research Laboratory F Terms (reference) 3K023 JA01 JB01 3K061 AA01 AB02 AC01 BA04 BA06 FA01 FA09 FA21 GA04 GA06 HA02 HA17 HA27 3K065 AA01 AB02 AC01 BA04 BA06 EA06 EA15 JA03 JA12 3K078 AA04 AA06 BA03 CA03 CA06 CA21

Claims (10)

[Claims] 1. Primary air is supplied into a combustible material layer supplied to a combustion furnace such as a stoker to perform primary combustion including gasification, and secondary air is supplied to a secondary combustion chamber above the combustion furnace. In a combustible material supply method for an incinerator that supplies a combustible material to an incinerator configured to perform secondary combustion, the combustible material is passed through a pyrolysis gasification unit that performs pyrolysis gasification of the combustible material. A combustible material supply method for an incinerator, characterized in that the combustible materials are supplied in parallel by a first supply path for supplying to the combustion furnace and a second supply path for directly supplying to the combustion furnace. 2. The combustible material supply method for an incinerator according to claim 1, wherein the gasified gas generated in the pyrolysis gasification section is introduced into the secondary combustion chamber and burned. 3. The heating air heated by the gas during or after the secondary combustion of the combustion furnace is introduced into the thermal decomposition gasification section, and is supplied to the thermal decomposition gasification section by the heating air. The combustible material supply method for an incinerator according to claim 1, wherein the combustible material is pyrolyzed and gasified. 4. The recirculation gas (EGR gas) from the dust removal device after the secondary combustion is guided to the pyrolysis gasification section, and the combustible material supplied to the pyrolysis gasification section by the recirculation gas is discharged. The combustible material supply method for an incinerator according to claim 1, wherein the method comprises pyrolyzing and gasifying. 5. The combustible material supply method for an incinerator according to claim 1, wherein steam is supplied to the pyrolysis gasification section and the steam is used for the pyrolysis gasification of the combustible material. 6. The method according to claim 1, wherein oxygen or oxygen-enriched air is supplied to the pyrolysis gasification section, and the oxygen or oxygen-enriched air is used for pyrolysis gasification of the combustible material. For supplying combustibles to incinerators. 7. A secondary combustion provided above the combustion furnace by supplying primary air into the combustible material layer directly supplied to the combustion furnace such as a stoker from the first combustible material supply unit to perform primary combustion. In a combustible material supply device of an incinerator configured to supply secondary air to the chamber to perform secondary combustion, a pyrolysis gasification means for pyrolyzing and gasifying the combustible material is attached to the incinerator. A second combustible material supply section for supplying a combustible material to the pyrolysis gasification means is provided separately from the first combustible material supply section, and the pyrolysis gasification means and the secondary combustion chamber are connected to each other. Then, a gasification gas passage for introducing all or part of the pyrolysis gas generated by the pyrolysis gasification means into the secondary combustion chamber is provided, and the pyrolysis gasification means is provided with respect to the incinerator. Incinerator combustible material supply device characterized by being tilted and adjusting the tilt angle . 8. The pyrolysis gasification means comprises a combustible material flowing in a cylindrical combustible material supply duct, and a heating fluid passage formed between the outer circumference of the combustible material supply duct and the inner circumference of the case. The combustible substance supply device for an incinerator according to claim 7, wherein the combustible substance supply device for an incinerator comprises a kiln that heats and gasifies the combustible substance by exchanging heat with a flowing heating fluid. 9. An air preheater for heating air by the heat of the gas in the furnace is provided at the secondary combustion chamber or at the outlet of the secondary combustion chamber, and the air outlet of the air preheater is used for the pyrolysis gasification. The combustible material supply device for an incinerator according to claim 7, wherein the combustible material supply device is configured to be connected to a means for supplying heated air from the air preheater to the pyrolysis gasification means. 10. A recirculation gas pipe line connecting the recirculation gas (EGR gas) outlet of the dust removal device after the secondary combustion and the pyrolysis gasification means is provided, and the recirculation gas is supplied to the recirculation gas. The combustible material supply apparatus for an incinerator according to claim 7, wherein the apparatus is configured to supply a pipeline to the pyrolysis gasification means.