JP4055452B2 - Coal-fired boiler, organic waste gasifier and coal ash treatment plant - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a novel coal ash treatment plant equipped with a novel coal-fired boiler and a spouted-bed gasifier that gasifies organic waste into combustible gas, and more particularly, coal ash produced from a coal-fired boiler. A coal-fired boiler and a spouted bed type gasifier that melts and processes coal ash in a gasification furnace that thermally decomposes and partially oxidizes organic waste such as waste plastic with an oxidizing agent such as oxygen. The present invention relates to a coal ash treatment plant equipped with a furnace.
[0002]
[Prior art]
The amount of combustion ash emitted is expected to increase with the recent expansion and construction of coal-fired power plants, and the treatment of combustion ash discharged from coal-fired power plants has become a major issue.
[0003]
Typical treatment methods for combustion ash discharged from conventional coal-fired boilers are broadly divided into (1) landfill and (2) effective reuse. In the case of landfilling, it is difficult to secure a disposal site for combustion ash because the elution water of combustion ash is highly alkaline. For this reason, it is desired to promote effective reuse.
[0004]
The effective use is divided into (1) cement field, (2) civil engineering field, (3) architecture field, and (4) agriculture, forestry and fishery field, and most of them are reuse in cement field. In the cement field, it is currently used for cement raw materials, cement admixtures and concrete admixtures. Furthermore, in order to expand the use of coal ash, it is necessary to expand to fields (2) to (4). However, in order to use it as a raw material for cement, it is necessary to reduce the unburned content in the ash as much as possible. The combustion ash discharged from the pulverized coal boiler contains 3-5% of unburned content. This value varies depending on the type of coal, and coal that has a high fuel ratio and is difficult to burn produces much unburned coal. Stone combustion with a carbon content of 5.0% or more had to be pretreated in a coal ash reformer or the like. The regulation value of carbon used in cement raw materials is 5.0% or less. The typical example which processes the combustion ash produced | generated from the coal cooking boiler below is shown below.
[0005]
JP-A-61-225891 discloses a first fly ash collecting means for separating and collecting fly ash from gas generated by coal combustion, and fly ash and oxygen enriched by this means. A slag tap type combustion furnace in which air is injected and introduced, a means for taking out molten slag generated by oxygen-enriched combustion of scattered ash in the combustion furnace, and a small amount of unburned carbon from the generated gas There is shown a method for treating fly ash comprising a second fly ash means for collecting ash, which is taken out of the system or returned to the combustion furnace.
[0006]
Japanese Patent Application Laid-Open No. 7-59924 discloses that when treating coal ash generated from a pulverized coal-fired boiler, the boiler burns pulverized coal so that the unburned carbon concentration in the coal ash is 5 to 20%. Then, the coal ash in which the unburned carbon content remains is guided to the melting furnace, the coal ash is burned and melted with oxygen or oxygen-enriched gas, and the high-temperature combustion exhaust gas discharged from the melting furnace is fed to the boiler. A return coal ash treatment method is shown.
[0007]
JP-A-2001-153309 discloses a means for supplying coal ash recovered by a dust collector to the ash melting furnace in an ash melting furnace that generates high-temperature combustion gas and a pulverized coal boiler having a plurality of stages of burners. An ash melting furnace exhaust gas outlet pipe is attached to the lower stage of the bottom burner of the pulverized coal boiler, and the exhaust gas and fly ash from the ash melting furnace are also supplied to the pulverized coal boiler at the same time. A coal ash treatment method using a furnace is shown.
[0008]
[Problems to be solved by the invention]
In Japanese Patent Laid-Open No. 62-125891, fly ash having unburned carbon is burned in a slag tap type combustion furnace to reduce unburned carbon in the fly ash, and treatment of coal ash formed at the bottom of the boiler Is not indicated, nor is it indicated for the treatment of organic waste.
[0009]
In JP-A-7-59924, in a boiler, pulverized coal is burned so that the unburned carbon concentration in the coal ash becomes 5 to 20%, and recovered from the bottom ash taken out from the bottom of the boiler and the combustion exhaust gas. The fly ash having unburned carbon is burned in the combustion section provided on the melting furnace, and the unburned carbon in the bottom ash and fly ash is reduced and the coal ash is melted. There is also no indication of the relationship between the treatment of organic waste and the resulting treatment of coal ash.
[0010]
In Japanese Patent Laid-Open No. 2001-153309, fly ash having unburned carbon is burned in an ash melting furnace to reduce unburned carbon in fly ash and further reduce NOx emissions from the ash melting furnace. The high-temperature combustion gas that has come out is supplied to the bottom of the boiler, but the treatment of coal ash formed at the bottom of the boiler is not shown, and the treatment of organic waste is not shown.
[0011]
An object of the present invention, spouted bed gasification which can be melt processed coal ash produced from the combustion of coal-fired boilers and clause economizer with gasified combustible gas of organic waste, such as plastic An object of the present invention is to provide a coal ash treatment plant equipped with a furnace, and equipped with a coal-fired boiler that can use the generated combustible gas as fuel for a coal-fired boiler .
[0013]
[Means for Solving the Problems]
The present invention relates to a coal ash treatment plant including a coal-fired boiler, which will be described later, and a spouted-bed gasification furnace that gasifies organic waste into a combustible gas and melts the coal ash recovered from the boiler. There, the coal-fired boiler, a combustion portion for burning coal, and primary heat exchange unit which superheated tube is provided to the combustion section upper secondary to economizer downstream of the heat exchange unit is provided The bottom ash recovered from the cooling tower in a heat exchange section, a cooling tower that cools the bottom ash generated in the combustion section, and a spouted bed gasification furnace that gasifies organic waste into a combustible gas. A boiler combustion unit bottom ash supply device to supply, a fly ash supply device for supplying fly ash recovered from the gas discharged from the economizer to the gasifier, and a heating device for heating the fly ash supply device Have
[0014]
Further, in the coal ash treatment plant of the present invention, the coal-fired boiler includes a combustion part for burning coal, a primary heat exchange part provided with a superheat pipe at the upper part of the combustion part, and a downstream part of the heat exchange part. A secondary heat exchange section provided with a charcoal unit, a cooling tower that cools bottom ash generated in the combustion section, and a spouted bed gasification furnace that gasifies organic waste into a combustible gas. a boiler combustion unit bottom ash supply device for supplying said bottom ash recovered from the fly ash supply unit for supplying fly ash recovered from the gas leaving the pre-Symbol economizer to said gasification furnace, said scattering and a heating device for heating the ash feeder, that having a combustible gas supply hand stage supplying pre Symbol combustible gases produced from the spouted-bed gasification furnace described above to the combustion unit.
[0015]
Spouted bed gasification furnace organic waste gasified combustible gas of the present invention, a gasification chamber for gasifying the organic waste into a combustible gas, provided in the upper part of the gasification chamber A heat recovery boiler that recovers heat generated in the gasification chamber; and a flow pipe that connects the coal-fired boiler that supplies the generated gas generated in the gasification chamber as fuel to the coal-fired boiler and the heat recovery boiler. It is preferable to have.
[0016]
In the above, the coal ash generated in the coal-fired boiler is supplied to the gasification chamber, and the char and harmful components in the combustible gas generated from the spouted bed gasifier are removed. It has at least one of the removal apparatuses connected to the flow pipe.
[0017]
The spouted bed gasification furnace of the coal ash treatment plant according to the present invention includes a cylindrical gasification chamber that gasifies organic waste into a combustible gas, and the organic waste and oxidant are contained in the gasification chamber. An organic waste supply nozzle arranged to form a swirl flow along the circumferential direction, a slag cooling chamber provided at a lower portion of the gasification chamber for cooling the ash melted in the gasification chamber, A heat recovery boiler that recovers heat generated in the gasification chamber, and coal ash that is provided in the lower part of the gasification chamber and generated in the coal-fired boiler forms a swirl flow along the circumferential direction in the gasification chamber. and having a coal ash supply nozzle for supplying.
[0018]
In the above, the distribution pipe connecting the coal-fired boiler and the gasification furnace for supplying the combustible gas as fuel to the coal-fired boiler, and the char and harmful components in the combustible gas generated from the gasification furnace, It is preferable to have a removal device that is removed and connected to the flow pipe.
[0019]
The organic waste supply nozzle and the coal ash supply nozzle are preferably provided with an oxidant supply nozzle for supplying an oxidant to the outer periphery thereof.
[0020]
A plurality of oxidant supply nozzles for supplying an oxidant to the gasification chamber are arranged so as to form a swirling flow in the circumferential direction of the gasification chamber, and the oxidant supply nozzles are the organic waste supply nozzle and It is preferable to be provided in the upper part of the coal ash supply nozzle.
[0021]
It is preferable that the diameter of the swirl flow formed by the oxidant supply nozzle is larger than the diameter of the swirl flow formed by the organic waste supply nozzle and the coal ash supply nozzle.
[0024]
As described above, the present invention gasifies organic waste such as plastic into flammable gas, and at that time, the generated ash is melt-processed simultaneously with the coal ash generated from the coal-fired boiler. Gasification treatment of organic waste, and the generated carbon monoxide and hydrogen-rich combustible gas are supplied into a coal-fired boiler and co-fired as fuel. The efficiency of continuous processing of coal ash can be improved.
[0025]
In particular, the spouted bed type gasification furnace for gasifying organic waste in the present invention has one chamber, and the residence time of the particles is extended by forming a swirl flow in the upper stage and the lower stage in the furnace, In addition, it is possible to obtain a combustible gas mainly composed of carbon monoxide and hydrogen by simultaneously filling pyrolysis and partial oxidation in one furnace.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a system diagram showing a configuration of a coal ash treatment plant based on organic waste and coal combustion according to the present invention. As shown in FIG. 1, an organic waste 3 and an oxidizing agent are supplied to a coal-fired boiler 21 in a spouted bed gasification furnace 9 (hereinafter referred to as a gasification furnace 9), and the organic waste 5 is thermally decomposed. A gasification furnace 9 (having a heat recovery boiler installed in the upper part of the gasification furnace reaction section) for obtaining a gas mainly composed of hydrogen and carbon monoxide by reaction and partial oxidation reaction, and a char in the generated gas at the outlet of the gasification furnace and Bottom ash generated from coal-fired boiler 21 and removal device 35 (including a dust collector and refining device) for removing harmful substances such as chlorine, gasifier 9 and combustion pipe 34 connecting coal-fired boiler 21. And the boiler combustion part bottom ash supply apparatus 22 and the fly ash supply apparatus 25 which supply fly ash to the gasification furnace 9 are supplied to the gasification furnace 9 through the coal ash supply nozzle 28.
[0027]
Nozzle for supplying organic ash 5 to the lower stage of the gasification furnace 9, bottom ash generated from the coal-burning combustion unit 34 through the bottom ash supply line 23, and fly ash scattered and recovered from the boiler through the fly ash supply line 26 Nozzle 30 having 28 and 28 ′ (both ejecting oxidant 6) and supplying oxidant 6 alone is installed. When the oxidant is supplied into the gasification furnace 9 at the same time as the organic waste 5 is supplied, a swirling flow 31 is formed in the gasification chamber 11 ′. When the organic waste 5 is supplied into the gasification furnace 9 by using the organic waste supply device 3 in the lower part, it falls by gravity, and a part of the organic waste 5 is thermally decomposed, and the carbons 2 The above hydrocarbon gas is produced. The generated heat becomes high temperature, and the ash in the organic waste 5 melts. Bottom ash Bottom ash supply line 23 and coal-fired fly ash supply line 26 the fly ash from the economizer an outgoing gas scattered recovery boiler 21 which is discharged from the bottom of the combustion section 34 of the coal-fired boiler 21 to the high-temperature zone through, conveyed by the feeder 22 and 25, it was fed through the ash supply nozzle 28, 28 'installed in the lower portion. Molten ash is discharged from the bottom of the gasifier.
[0028]
The hydrocarbon gas having two or more carbon chains generated by pyrolysis rises to the upper part of the gasification furnace, and lightens when the oxidant 32 is swirled from the oxidant nozzle 12 installed in the upper stage and reacted with the oxidant. To produce carbon monoxide and hydrogen. However, when organic waste 5 is gasified, harmful substances such as chlorine are generated in minute amounts. Therefore, a purification device that removes harmful substances is installed, and a char containing unburned carbon is included in the generated gas. Because it contains, we installed a dust collector to remove it and made it clean gas. This gas is distributed from the distribution pipe to the coal-fired boiler combustion section 34 and used as fuel.
[0029]
The system of FIG. 1 is roughly divided into a gasification furnace 9 for organic waste gasification, a removal device (including a dust collector and a purification device) 35 an organic waste gasification furnace 9 to a coal-fired boiler circulation pipe 16, coal It comprises a cooking boiler 21, a coal cooking boiler combustion unit bottom ash supply device 22, a dust collector (such as a cyclone and a bag filter) 24, and a fly ash supply device 25.
[0030]
The gasification furnace 9 includes a molten slag cooling unit 14, a gasification reaction unit 11, and a heat recovery boiler 10. The gasification reaction unit 11 is a spouted bed type gasification furnace that gasifies an oxidant and the organic waste 5 in contact with each other in an air stream. This feature adopts a one-chamber, two-stage gasification system, branches the raw material and oxidant into the upper and lower stages, and forms a swirling flow, so that the residence time of the gas and the raw material becomes longer and the gasification efficiency can be improved. Is. The organic waste 5 in the organic waste filling container 1 is supplied to the lower stage from the supply line 4 into the gasifier reactor lower part 11 'through the organic waste supply device 3 (mechanical means, etc.). Then, it falls by gravity, and a part of organic waste 5 is thermally decomposed, and produces | generates hydrocarbon gas 2 or more carbons. The generated heat becomes high temperature, and the ash in the organic waste 5 melts. A boiler combustion unit bottom ash feeder 22 bottom ash through the bottom ash supply line 23 which is discharged from the bottom of the combustion section 34 of the coal-fired boiler 21 to the high-temperature zone, the coal-fired gas exiting the economizer of the boiler 21 through the fly ash supply line 26 scattered recovered fly ash from, and discharged by fly ash feeder 2 5, the inert gas (nitrogen, carbon dioxide, etc.) 36, 36 'and pneumatic conveying, gasification unit lower It supplied through the coal ash supply nozzles 28 and 28 'shown in FIG. The coal ash supply nozzles 28 and 28 'are of a water cooling type in which water is circulated to the outer wall.
[0031]
As shown in FIG. 2, the bottom ash 23 that has come out from the bottom of the boiler passes through the boiler combustion unit coal ash supply device 22, and is then scattered and collected from the coal ash supply nozzle 28 ′ to the gasifier 9 and from the boiler 21. 26 are supplied to the gasifier 9 from the coal ash supply nozzle 28 through the coal ash supply device 25. Further, oxygen is supplied to each nozzle through an oxygen supply line provided on the outer periphery thereof. The coal ash supply portion is supplied with the organic waste 5 and oxygen from the oxygen supply line provided on the outer periphery thereof to the gasifier 9 and oxygen from the oxidizer nozzle 30. Either supply is supplied so as to form a swirling flow.
[0032]
FIG. 3 is a cross-sectional view of the oxidizer nozzle 12 that supplies oxygen to the gasification furnace 9. Four oxidizer nozzles 12 are equally arranged on the outer periphery of the gasification furnace 9, and all are arranged so that a swirling flow is formed. The diameter of the swirl flow is larger than the diameter of the swirl flow formed by the coal ash supply nozzle, and a two-stage swirl flow is formed.
[0033]
As described above, the gasification furnace 9 in this embodiment has one chamber, and the residence time of the coal ash and the organic waste particles is extended by forming a swirl flow in the upper stage and the lower stage in the furnace, In addition, it is possible to obtain a fuel gas mainly composed of carbon monoxide and hydrogen by simultaneously satisfying thermal decomposition and partial oxidation in one furnace.
[0034]
Since the lower region becomes a high temperature of 1600 ° C. or higher, the ash and the coal ash in the organic waste 5 are melted to produce the slag 13. This slag 13 was allowed to fall freely into a cooling part 14 in which water was filled in the lower part of the gasification reaction part lower step part 11 ′, and was rapidly cooled and solidified.
[0035]
The oxidant (oxygen) has an oxidant filling container 6, an upper oxygen supply line 32, an upper oxygen supply amount adjustment valve 7, a lower oxygen supply line 29, and a lower oxygen supply amount adjustment valve 8. The supply amounts of the upper and lower oxidizers were set in accordance with the temperatures of the upper and lower stages. The temperature control of the upper and lower stages is adjusted by the ratio of the oxygen supply amount and the organic waste 5 supply amount.
[0036]
The hydrocarbon gas having two or more carbon chains generated by pyrolysis rises to the upper part of the gasification furnace, and when the oxidant 32 is swirled and supplied from the oxidant nozzle 12 installed in the upper stage 11 ″, it reacts with the oxidant. The gas generated from the gasification reaction unit 11 recovers the heat of the high-temperature gas by the heat recovery boiler 10. In addition, the gas in the generated gas is discharged to the gasification furnace 9 at the outlet. Removal device 35 that removes harmful substances (Since the produced gas contains a trace amount of harmful substances such as chlorine, a purification device that removes the harmful substances and a char containing unburned carbon are several percent. Since it is included, a dust collecting device for removing the char is installed and converted into clean gas, and then supplied to the coal-fired boiler combustion unit 34.
[0037]
The clean gas rich in carbon monoxide and hydrogen is supplied from the gasification furnace 9 through the coal-fired boiler flow pipe 16 to the coal-fired boiler combustion unit 34 and co-fired as fuel. The product gas generated from the gasification furnace 9 contains little nitrogen oxides. However, the raw material with a large amount of nitrogen in the organic waste 5 has a somewhat higher content of nitrogen oxides. Although coal and air are supplied to the coal-fired boiler 21 from the coal supply nozzle 18, primary, secondary and tertiary superheat pipes and reheat pipes are sequentially arranged on the downstream side of the boiler body. A reheating tube, a heater, an evaporator, and a economizer are sequentially arranged in the auxiliary part.
[0038]
The coal-burning boiler combustion section bottom ash supply device 22 and the fly ash supply device 25 are discharged quantitatively by mechanical means such as a rotary feeder, and then air-flowed with an inert gas (nitrogen, carbon dioxide, etc.) to react with the gasifier. It supplies in part 11 '. Details of the coal-fired boiler combustion unit bottom ash supply device 22 and the fly ash supply device 25 will be described with reference to FIG.
[0039]
At the bottom of the combustion furnace 34, set up a cooling tower 38, 40 filled with water to cool the bottom ash, after once cooled around 800 ° C. Bottom ash was discharged into the ash collection container 42. Then, while blowing drying air at around 200 ° C., the belt conveyor 51 supplies the coal-fired boiler combustion unit bottom ash supply device 22 having the crusher 43, and sends the pulverized bottom ash by the screw feeder 45. While being supplied, the carrier gas (or inert gas) 36 was supplied from the bottom ash supply line 23 to the gasification reaction section 11 ′ through the coal ash supply nozzle 28 ′. Since the bottom ash contains a lump of 40 mm or more, if it is supplied to the transport line in this state, there is a possibility of clogging. Therefore, the bottom ash is crushed to 0.15 mm or less and then discharged quantitatively by the screw feeder 45. .
[0040]
The fly ash supply system includes a dust collector 24, a dust collection recovery hopper 46, a valve 48, and a fly ash supply device 25. The fly ash supply device 25 includes a hopper 47, a screw feeder 50, a transfer gas (or inert gas) 36 ′, and a fly ash supply line 26. Since the fly ash is around 200 ° C., each of the above devices is heated to around 150 ° C. so as not to condense due to the temperature falling in the fly ash supply system. The scattered ash is collected by the dust collector 24 and then filled in the dust collection hopper 46, then supplied to the scattered ash supply device 25, and quantitatively discharged using the screw feeder 50. The discharged fly ash is supplied from the fly ash supply line 26 to the gasification reaction unit 11 ′ through the coal ash nozzle 28 by the transfer gas 36 ′.
[0041]
As described above, coal ash generated from a coal-fired boiler is simultaneously melted in a gasification furnace that melts organic waste such as plastics, and organic waste is gasified so that combustible gas is generated. By supplying the combustible gas rich in carbon monoxide and hydrogen produced into the coal-fired boiler and co-firing it as fuel, the energy can be used effectively and at the same time the efficiency of continuous processing of coal ash is increased. Can be planned.
[0042]
【The invention's effect】
According to the present invention, the coal ash generated from the coal-fired boiler is simultaneously melt-treated in the gasification furnace for melting the organic waste such as plastic, and the organic waste is gasified to the combustible gas. By supplying the generated combustible gas rich in carbon monoxide and hydrogen into a coal-fired boiler and co-firing it as fuel, energy can be used effectively, and at the same time, the efficiency of continuous processing of coal ash can be improved. I can plan. In addition, after gasifying organic waste and distributing it to dust collectors and purifiers that remove toxic substances such as dust and chlorine in flammable gases, the product gas rich in carbon monoxide and hydrogen is cooked in coal. The energy of the combustible gas produced | generated from the gasification furnace can be effectively utilized by supplying in a boiler and co-firing as a fuel.
[Brief description of the drawings]
1 is a system diagram showing a configuration of a coal ash treatment plants that have a and a coal-fired boiler spouted bed gasification furnace of the present invention.
FIG. 2 is a cross-sectional view of a lower stage coal ash supply nozzle in the gasification furnace of the present invention.
FIG. 3 is a cross-sectional view of an upper-stage oxidizer nozzle in the gasification furnace of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Organic waste filling container, 2 ... Nitrogen gas for pressurization and conveyance, 3 ... Organic waste supply apparatus (mechanical means etc.), 4 ... Supply line, 5 ... Organic waste, 6 ... Oxidizing agent Filling container, 7 ... upper oxygen flow rate control valve, 8 ... lower oxygen flow rate control valve, 9 ... gasification furnace, 10 ... heat recovery boiler, 11 ... gasification reaction section, 11 '... lower stage section of gasification reaction section, 11 " ... upper stage part of gasification reaction part, 12 ... oxidizer nozzle, 13 ... molten slag, 14 ... molten slag cooling part (water filling), 15 ... slag hopper, 16 ... flow pipe between boiler combustion from gasification furnace, 17 ... coal combustion Air gas, 18 ... Coal supply nozzle, 19 ... Coal supply unit, 20 ... Coal supply line, 21 ... Coal cooking boiler, 22 ... Coal cooking boiler combustion unit bottom ash supply device, 23 ... Bottom ash supply line, 24 ... Collection Dust device (cyclone, bag filter, etc.), 2 5 ... Flying ash supply device, 26 ... Flying ash supply line, 27 ... To refiner, 28, 28 '... Coal ash supply nozzle, 29 ... Lower oxygen supply line, 30 ... Oxidant nozzle, 31 ... Lower swirl flow, 32 ... upper oxygen supply line, 33 ... upper swirl flow, 34 ... coal-fired boiler combustion section, 35 ... removal device, 36, 36 '... inert gas (nitrogen, carbon dioxide, etc.), 37 ... switching valve, 38 ... cooling tower , 39 ... Switching valve, 40 ... Cooling tower, 41 ... Switching valve, 42 ... Ash recovery container, 43 ... Crusher, 44 ... Gas for adjusting hopper pressure (or inert gas), 45 ... Screw feeder, 46 ... Dust collection Hopper, 47 ... hopper, 48 ... switching valve, 49 ... hopper pressurizing gas (or inert gas), 50 ... screw feeder, 51 ... belt conveyor.

Claims (3)

A coal-fired boiler, and a spouted-bed gasification furnace for gasifying organic waste into combustible gas and melting the coal ash recovered from the boiler,
The coal-fired boiler includes a combustion unit for burning coal, a primary heat exchange unit provided with a superheater pipe at the upper part of the combustion unit, and a secondary heat exchange unit provided with a economizer downstream of the heat exchange unit A cooling tower that cools the bottom ash generated in the combustion section, a boiler combustion section bottom ash supply device that supplies the bottom ash recovered from the cooling tower to the spouted bed gasification furnace, and the boiler Coal ash, comprising: a fly ash supply device for supplying fly ash recovered from gas exiting the economizer to the spouted bed gasification furnace; and a heating device for heating the fly ash supply device Processing plant. A coal-fired boiler, a spouted-bed gasification furnace that gasifies organic waste into combustible gas and melt-treats the coal ash recovered from the boiler, and the combustible gas from the spouted-bed gasification furnace And a combustible gas supply means for supplying to the combustion section of the coal-fired boiler,
The coal-fired boiler includes a combustion section that burns the coal, a primary heat exchange section that is provided with a superheater pipe at the top of the combustion section, and a secondary heat exchange that is provided with a economizer downstream of the heat exchange section. A cooling tower that cools the bottom ash produced in the combustion section, a boiler combustion section bottom ash supply device that supplies the bottom ash recovered from the cooling tower to the spouted bed gasification furnace, and the section Coal ash comprising: a fly ash supply device for supplying fly ash recovered from combustion gas exiting the charcoal to the spouted bed gasification furnace; and a heating device for heating the fly ash supply device Processing plant.   3. The spouted bed gasification furnace according to claim 1, wherein the spouted bed gasification furnace includes a cylindrical gasification chamber that gasifies organic waste into a combustible gas, and the organic waste and the oxidizing agent are contained in the gasification chamber. An organic waste supply nozzle arranged to form a swirling flow along a circumferential direction, a slag cooling chamber provided at a lower portion of the gasification chamber for cooling the ash melted in the gasification chamber, A heat recovery boiler that recovers the heat generated in the gasification chamber, and the bottom ash and scattered ash generated in the coal-fired boiler provided at the lower portion of the gasification chamber swirl along the circumferential direction in the gasification chamber A coal ash treatment plant comprising a coal ash supply nozzle that supplies the ash so as to form a gas.

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